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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 int    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 work_struct      event_processor; /* endpoint event processor */
156         struct list_head        services;       /* services listening on this endpoint */
157         struct list_head        link;           /* link in endpoint list */
158         struct rw_semaphore     defrag_sem;     /* control re-enablement of IP DF bit */
159         struct sk_buff_head     accept_queue;   /* incoming calls awaiting acceptance */
160         struct sk_buff_head     reject_queue;   /* packets awaiting rejection */
161         struct sk_buff_head     event_queue;    /* endpoint event packets awaiting processing */
162         spinlock_t              lock;           /* access lock */
163         rwlock_t                services_lock;  /* lock for services list */
164         atomic_t                usage;
165         int                     debug_id;       /* debug ID for printks */
166         volatile char           error_rcvd;     /* T if received ICMP error outstanding */
167         struct sockaddr_rxrpc   srx;            /* local address */
168 };
169
170 /*
171  * RxRPC remote transport endpoint definition
172  * - matched by remote port, address and protocol type
173  * - holds the connection ID counter for connections between the two endpoints
174  */
175 struct rxrpc_peer {
176         struct work_struct      destroyer;      /* peer destroyer */
177         struct list_head        link;           /* link in master peer list */
178         struct list_head        error_targets;  /* targets for net error distribution */
179         spinlock_t              lock;           /* access lock */
180         atomic_t                usage;
181         unsigned int            if_mtu;         /* interface MTU for this peer */
182         unsigned int            mtu;            /* network MTU for this peer */
183         unsigned int            maxdata;        /* data size (MTU - hdrsize) */
184         unsigned short          hdrsize;        /* header size (IP + UDP + RxRPC) */
185         int                     debug_id;       /* debug ID for printks */
186         int                     net_error;      /* network error distributed */
187         struct sockaddr_rxrpc   srx;            /* remote address */
188
189         /* calculated RTT cache */
190 #define RXRPC_RTT_CACHE_SIZE 32
191         suseconds_t             rtt;            /* current RTT estimate (in uS) */
192         unsigned int            rtt_point;      /* next entry at which to insert */
193         unsigned int            rtt_usage;      /* amount of cache actually used */
194         suseconds_t             rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* calculated RTT cache */
195 };
196
197 /*
198  * RxRPC point-to-point transport / connection manager definition
199  * - handles a bundle of connections between two endpoints
200  * - matched by { local, peer }
201  */
202 struct rxrpc_transport {
203         struct rxrpc_local      *local;         /* local transport endpoint */
204         struct rxrpc_peer       *peer;          /* remote transport endpoint */
205         struct work_struct      error_handler;  /* network error distributor */
206         struct rb_root          bundles;        /* client connection bundles on this transport */
207         struct rb_root          client_conns;   /* client connections on this transport */
208         struct rb_root          server_conns;   /* server connections on this transport */
209         struct list_head        link;           /* link in master session list */
210         struct sk_buff_head     error_queue;    /* error packets awaiting processing */
211         unsigned long           put_time;       /* time at which to reap */
212         spinlock_t              client_lock;    /* client connection allocation lock */
213         rwlock_t                conn_lock;      /* lock for active/dead connections */
214         atomic_t                usage;
215         int                     debug_id;       /* debug ID for printks */
216         unsigned int            conn_idcounter; /* connection ID counter (client) */
217 };
218
219 /*
220  * RxRPC client connection bundle
221  * - matched by { transport, service_id, key }
222  */
223 struct rxrpc_conn_bundle {
224         struct rb_node          node;           /* node in transport's lookup tree */
225         struct list_head        unused_conns;   /* unused connections in this bundle */
226         struct list_head        avail_conns;    /* available connections in this bundle */
227         struct list_head        busy_conns;     /* busy connections in this bundle */
228         struct key              *key;           /* security for this bundle */
229         wait_queue_head_t       chanwait;       /* wait for channel to become available */
230         atomic_t                usage;
231         int                     debug_id;       /* debug ID for printks */
232         unsigned short          num_conns;      /* number of connections in this bundle */
233         __be16                  service_id;     /* service ID */
234         u8                      security_ix;    /* security type */
235 };
236
237 /*
238  * RxRPC connection definition
239  * - matched by { transport, service_id, conn_id, direction, key }
240  * - each connection can only handle four simultaneous calls
241  */
242 struct rxrpc_connection {
243         struct rxrpc_transport  *trans;         /* transport session */
244         struct rxrpc_conn_bundle *bundle;       /* connection bundle (client) */
245         struct work_struct      processor;      /* connection event processor */
246         struct rb_node          node;           /* node in transport's lookup tree */
247         struct list_head        link;           /* link in master connection list */
248         struct list_head        bundle_link;    /* link in bundle */
249         struct rb_root          calls;          /* calls on this connection */
250         struct sk_buff_head     rx_queue;       /* received conn-level packets */
251         struct rxrpc_call       *channels[RXRPC_MAXCALLS]; /* channels (active calls) */
252         struct rxrpc_security   *security;      /* applied security module */
253         struct key              *key;           /* security for this connection (client) */
254         struct key              *server_key;    /* security for this service */
255         struct crypto_skcipher  *cipher;        /* encryption handle */
256         struct rxrpc_crypt      csum_iv;        /* packet checksum base */
257         unsigned long           events;
258 #define RXRPC_CONN_CHALLENGE    0               /* send challenge packet */
259         unsigned long           put_time;       /* time at which to reap */
260         rwlock_t                lock;           /* access lock */
261         spinlock_t              state_lock;     /* state-change lock */
262         atomic_t                usage;
263         u32                     real_conn_id;   /* connection ID (host-endian) */
264         enum {                                  /* current state of connection */
265                 RXRPC_CONN_UNUSED,              /* - connection not yet attempted */
266                 RXRPC_CONN_CLIENT,              /* - client connection */
267                 RXRPC_CONN_SERVER_UNSECURED,    /* - server unsecured connection */
268                 RXRPC_CONN_SERVER_CHALLENGING,  /* - server challenging for security */
269                 RXRPC_CONN_SERVER,              /* - server secured connection */
270                 RXRPC_CONN_REMOTELY_ABORTED,    /* - conn aborted by peer */
271                 RXRPC_CONN_LOCALLY_ABORTED,     /* - conn aborted locally */
272                 RXRPC_CONN_NETWORK_ERROR,       /* - conn terminated by network error */
273         } state;
274         int                     error;          /* error code for local abort */
275         int                     debug_id;       /* debug ID for printks */
276         unsigned int            call_counter;   /* call ID counter */
277         atomic_t                serial;         /* packet serial number counter */
278         atomic_t                hi_serial;      /* highest serial number received */
279         u8                      avail_calls;    /* number of calls available */
280         u8                      size_align;     /* data size alignment (for security) */
281         u8                      header_size;    /* rxrpc + security header size */
282         u8                      security_size;  /* security header size */
283         u32                     security_level; /* security level negotiated */
284         u32                     security_nonce; /* response re-use preventer */
285
286         /* the following are all in net order */
287         __be32                  epoch;          /* epoch of this connection */
288         __be32                  cid;            /* connection ID */
289         __be16                  service_id;     /* service ID */
290         u8                      security_ix;    /* security type */
291         u8                      in_clientflag;  /* RXRPC_CLIENT_INITIATED if we are server */
292         u8                      out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
293 };
294
295 /*
296  * RxRPC call definition
297  * - matched by { connection, call_id }
298  */
299 struct rxrpc_call {
300         struct rxrpc_connection *conn;          /* connection carrying call */
301         struct rxrpc_sock       *socket;        /* socket responsible */
302         struct timer_list       lifetimer;      /* lifetime remaining on call */
303         struct timer_list       deadspan;       /* reap timer for re-ACK'ing, etc  */
304         struct timer_list       ack_timer;      /* ACK generation timer */
305         struct timer_list       resend_timer;   /* Tx resend timer */
306         struct work_struct      destroyer;      /* call destroyer */
307         struct work_struct      processor;      /* packet processor and ACK generator */
308         struct list_head        link;           /* link in master call list */
309         struct list_head        error_link;     /* link in error distribution list */
310         struct list_head        accept_link;    /* calls awaiting acceptance */
311         struct rb_node          sock_node;      /* node in socket call tree */
312         struct rb_node          conn_node;      /* node in connection call tree */
313         struct sk_buff_head     rx_queue;       /* received packets */
314         struct sk_buff_head     rx_oos_queue;   /* packets received out of sequence */
315         struct sk_buff          *tx_pending;    /* Tx socket buffer being filled */
316         wait_queue_head_t       tx_waitq;       /* wait for Tx window space to become available */
317         unsigned long           user_call_ID;   /* user-defined call ID */
318         unsigned long           creation_jif;   /* time of call creation */
319         unsigned long           flags;
320 #define RXRPC_CALL_RELEASED     0       /* call has been released - no more message to userspace */
321 #define RXRPC_CALL_TERMINAL_MSG 1       /* call has given the socket its final message */
322 #define RXRPC_CALL_RCVD_LAST    2       /* all packets received */
323 #define RXRPC_CALL_RUN_RTIMER   3       /* Tx resend timer started */
324 #define RXRPC_CALL_TX_SOFT_ACK  4       /* sent some soft ACKs */
325 #define RXRPC_CALL_PROC_BUSY    5       /* the processor is busy */
326 #define RXRPC_CALL_INIT_ACCEPT  6       /* acceptance was initiated */
327 #define RXRPC_CALL_HAS_USERID   7       /* has a user ID attached */
328 #define RXRPC_CALL_EXPECT_OOS   8       /* expect out of sequence packets */
329         unsigned long           events;
330 #define RXRPC_CALL_RCVD_ACKALL  0       /* ACKALL or reply received */
331 #define RXRPC_CALL_RCVD_BUSY    1       /* busy packet received */
332 #define RXRPC_CALL_RCVD_ABORT   2       /* abort packet received */
333 #define RXRPC_CALL_RCVD_ERROR   3       /* network error received */
334 #define RXRPC_CALL_ACK_FINAL    4       /* need to generate final ACK (and release call) */
335 #define RXRPC_CALL_ACK          5       /* need to generate ACK */
336 #define RXRPC_CALL_REJECT_BUSY  6       /* need to generate busy message */
337 #define RXRPC_CALL_ABORT        7       /* need to generate abort */
338 #define RXRPC_CALL_CONN_ABORT   8       /* local connection abort generated */
339 #define RXRPC_CALL_RESEND_TIMER 9       /* Tx resend timer expired */
340 #define RXRPC_CALL_RESEND       10      /* Tx resend required */
341 #define RXRPC_CALL_DRAIN_RX_OOS 11      /* drain the Rx out of sequence queue */
342 #define RXRPC_CALL_LIFE_TIMER   12      /* call's lifetimer ran out */
343 #define RXRPC_CALL_ACCEPTED     13      /* incoming call accepted by userspace app */
344 #define RXRPC_CALL_SECURED      14      /* incoming call's connection is now secure */
345 #define RXRPC_CALL_POST_ACCEPT  15      /* need to post an "accept?" message to the app */
346 #define RXRPC_CALL_RELEASE      16      /* need to release the call's resources */
347
348         spinlock_t              lock;
349         rwlock_t                state_lock;     /* lock for state transition */
350         atomic_t                usage;
351         atomic_t                sequence;       /* Tx data packet sequence counter */
352         u32                     abort_code;     /* local/remote abort code */
353         enum {                                  /* current state of call */
354                 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
355                 RXRPC_CALL_CLIENT_AWAIT_REPLY,  /* - client awaiting reply */
356                 RXRPC_CALL_CLIENT_RECV_REPLY,   /* - client receiving reply phase */
357                 RXRPC_CALL_CLIENT_FINAL_ACK,    /* - client sending final ACK phase */
358                 RXRPC_CALL_SERVER_SECURING,     /* - server securing request connection */
359                 RXRPC_CALL_SERVER_ACCEPTING,    /* - server accepting request */
360                 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
361                 RXRPC_CALL_SERVER_ACK_REQUEST,  /* - server pending ACK of request */
362                 RXRPC_CALL_SERVER_SEND_REPLY,   /* - server sending reply */
363                 RXRPC_CALL_SERVER_AWAIT_ACK,    /* - server awaiting final ACK */
364                 RXRPC_CALL_COMPLETE,            /* - call completed */
365                 RXRPC_CALL_SERVER_BUSY,         /* - call rejected by busy server */
366                 RXRPC_CALL_REMOTELY_ABORTED,    /* - call aborted by peer */
367                 RXRPC_CALL_LOCALLY_ABORTED,     /* - call aborted locally on error or close */
368                 RXRPC_CALL_NETWORK_ERROR,       /* - call terminated by network error */
369                 RXRPC_CALL_DEAD,                /* - call is dead */
370         } state;
371         int                     debug_id;       /* debug ID for printks */
372         u8                      channel;        /* connection channel occupied by this call */
373
374         /* transmission-phase ACK management */
375         u8                      acks_head;      /* offset into window of first entry */
376         u8                      acks_tail;      /* offset into window of last entry */
377         u8                      acks_winsz;     /* size of un-ACK'd window */
378         u8                      acks_unacked;   /* lowest unacked packet in last ACK received */
379         int                     acks_latest;    /* serial number of latest ACK received */
380         rxrpc_seq_t             acks_hard;      /* highest definitively ACK'd msg seq */
381         unsigned long           *acks_window;   /* sent packet window
382                                                  * - elements are pointers with LSB set if ACK'd
383                                                  */
384
385         /* receive-phase ACK management */
386         rxrpc_seq_t             rx_data_expect; /* next data seq ID expected to be received */
387         rxrpc_seq_t             rx_data_post;   /* next data seq ID expected to be posted */
388         rxrpc_seq_t             rx_data_recv;   /* last data seq ID encountered by recvmsg */
389         rxrpc_seq_t             rx_data_eaten;  /* last data seq ID consumed by recvmsg */
390         rxrpc_seq_t             rx_first_oos;   /* first packet in rx_oos_queue (or 0) */
391         rxrpc_seq_t             ackr_win_top;   /* top of ACK window (rx_data_eaten is bottom) */
392         rxrpc_seq_net_t         ackr_prev_seq;  /* previous sequence number received */
393         u8                      ackr_reason;    /* reason to ACK */
394         __be32                  ackr_serial;    /* serial of packet being ACK'd */
395         atomic_t                ackr_not_idle;  /* number of packets in Rx queue */
396
397         /* received packet records, 1 bit per record */
398 #define RXRPC_ACKR_WINDOW_ASZ DIV_ROUND_UP(RXRPC_MAXACKS, BITS_PER_LONG)
399         unsigned long           ackr_window[RXRPC_ACKR_WINDOW_ASZ + 1];
400
401         struct hlist_node       hash_node;
402         unsigned long           hash_key;       /* Full hash key */
403         u8                      in_clientflag;  /* Copy of conn->in_clientflag for hashing */
404         struct rxrpc_local      *local;         /* Local endpoint. Used for hashing. */
405         sa_family_t             proto;          /* Frame protocol */
406         /* the following should all be in net order */
407         __be32                  cid;            /* connection ID + channel index  */
408         __be32                  call_id;        /* call ID on connection  */
409         __be32                  epoch;          /* epoch of this connection */
410         __be16                  service_id;     /* service ID */
411         union {                                 /* Peer IP address for hashing */
412                 __be32  ipv4_addr;
413                 __u8    ipv6_addr[16];          /* Anticipates eventual IPv6 support */
414         } peer_ip;
415 };
416
417 /*
418  * locally abort an RxRPC call
419  */
420 static inline void rxrpc_abort_call(struct rxrpc_call *call, u32 abort_code)
421 {
422         write_lock_bh(&call->state_lock);
423         if (call->state < RXRPC_CALL_COMPLETE) {
424                 call->abort_code = abort_code;
425                 call->state = RXRPC_CALL_LOCALLY_ABORTED;
426                 set_bit(RXRPC_CALL_ABORT, &call->events);
427         }
428         write_unlock_bh(&call->state_lock);
429 }
430
431 /*
432  * af_rxrpc.c
433  */
434 extern atomic_t rxrpc_n_skbs;
435 extern __be32 rxrpc_epoch;
436 extern atomic_t rxrpc_debug_id;
437 extern struct workqueue_struct *rxrpc_workqueue;
438
439 /*
440  * ar-accept.c
441  */
442 void rxrpc_accept_incoming_calls(struct work_struct *);
443 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long);
444 int rxrpc_reject_call(struct rxrpc_sock *);
445
446 /*
447  * ar-ack.c
448  */
449 extern unsigned rxrpc_requested_ack_delay;
450 extern unsigned rxrpc_soft_ack_delay;
451 extern unsigned rxrpc_idle_ack_delay;
452 extern unsigned rxrpc_rx_window_size;
453 extern unsigned rxrpc_rx_mtu;
454 extern unsigned rxrpc_rx_jumbo_max;
455
456 void __rxrpc_propose_ACK(struct rxrpc_call *, u8, __be32, bool);
457 void rxrpc_propose_ACK(struct rxrpc_call *, u8, __be32, bool);
458 void rxrpc_process_call(struct work_struct *);
459
460 /*
461  * ar-call.c
462  */
463 extern unsigned rxrpc_max_call_lifetime;
464 extern unsigned rxrpc_dead_call_expiry;
465 extern struct kmem_cache *rxrpc_call_jar;
466 extern struct list_head rxrpc_calls;
467 extern rwlock_t rxrpc_call_lock;
468
469 struct rxrpc_call *rxrpc_find_call_hash(u8,  __be32, __be32, __be32,
470                                         __be16, void *, sa_family_t, const u8 *);
471 struct rxrpc_call *rxrpc_get_client_call(struct rxrpc_sock *,
472                                          struct rxrpc_transport *,
473                                          struct rxrpc_conn_bundle *,
474                                          unsigned long, int, gfp_t);
475 struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *,
476                                        struct rxrpc_connection *,
477                                        struct rxrpc_header *, gfp_t);
478 struct rxrpc_call *rxrpc_find_server_call(struct rxrpc_sock *, unsigned long);
479 void rxrpc_release_call(struct rxrpc_call *);
480 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
481 void __rxrpc_put_call(struct rxrpc_call *);
482 void __exit rxrpc_destroy_all_calls(void);
483
484 /*
485  * ar-connection.c
486  */
487 extern unsigned rxrpc_connection_expiry;
488 extern struct list_head rxrpc_connections;
489 extern rwlock_t rxrpc_connection_lock;
490
491 struct rxrpc_conn_bundle *rxrpc_get_bundle(struct rxrpc_sock *,
492                                            struct rxrpc_transport *,
493                                            struct key *, __be16, gfp_t);
494 void rxrpc_put_bundle(struct rxrpc_transport *, struct rxrpc_conn_bundle *);
495 int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_transport *,
496                        struct rxrpc_conn_bundle *, struct rxrpc_call *, gfp_t);
497 void rxrpc_put_connection(struct rxrpc_connection *);
498 void __exit rxrpc_destroy_all_connections(void);
499 struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *,
500                                                struct rxrpc_header *);
501 extern struct rxrpc_connection *
502 rxrpc_incoming_connection(struct rxrpc_transport *, struct rxrpc_header *,
503                           gfp_t);
504
505 /*
506  * ar-connevent.c
507  */
508 void rxrpc_process_connection(struct work_struct *);
509 void rxrpc_reject_packet(struct rxrpc_local *, struct sk_buff *);
510 void rxrpc_reject_packets(struct work_struct *);
511
512 /*
513  * ar-error.c
514  */
515 void rxrpc_UDP_error_report(struct sock *);
516 void rxrpc_UDP_error_handler(struct work_struct *);
517
518 /*
519  * ar-input.c
520  */
521 extern const char *rxrpc_pkts[];
522
523 void rxrpc_data_ready(struct sock *);
524 int rxrpc_queue_rcv_skb(struct rxrpc_call *, struct sk_buff *, bool, bool);
525 void rxrpc_fast_process_packet(struct rxrpc_call *, struct sk_buff *);
526
527 /*
528  * ar-local.c
529  */
530 extern rwlock_t rxrpc_local_lock;
531
532 struct rxrpc_local *rxrpc_lookup_local(struct sockaddr_rxrpc *);
533 void rxrpc_put_local(struct rxrpc_local *);
534 void __exit rxrpc_destroy_all_locals(void);
535
536 /*
537  * ar-key.c
538  */
539 extern struct key_type key_type_rxrpc;
540 extern struct key_type key_type_rxrpc_s;
541
542 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
543 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
544 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time_t,
545                               u32);
546
547 /*
548  * ar-output.c
549  */
550 extern unsigned rxrpc_resend_timeout;
551
552 int rxrpc_send_packet(struct rxrpc_transport *, struct sk_buff *);
553 int rxrpc_client_sendmsg(struct rxrpc_sock *, struct rxrpc_transport *,
554                          struct msghdr *, size_t);
555 int rxrpc_server_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
556
557 /*
558  * ar-peer.c
559  */
560 struct rxrpc_peer *rxrpc_get_peer(struct sockaddr_rxrpc *, gfp_t);
561 void rxrpc_put_peer(struct rxrpc_peer *);
562 struct rxrpc_peer *rxrpc_find_peer(struct rxrpc_local *, __be32, __be16);
563 void __exit rxrpc_destroy_all_peers(void);
564
565 /*
566  * ar-proc.c
567  */
568 extern const char *const rxrpc_call_states[];
569 extern const struct file_operations rxrpc_call_seq_fops;
570 extern const struct file_operations rxrpc_connection_seq_fops;
571
572 /*
573  * ar-recvmsg.c
574  */
575 void rxrpc_remove_user_ID(struct rxrpc_sock *, struct rxrpc_call *);
576 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
577
578 /*
579  * ar-security.c
580  */
581 int rxrpc_register_security(struct rxrpc_security *);
582 void rxrpc_unregister_security(struct rxrpc_security *);
583 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
584 int rxrpc_init_server_conn_security(struct rxrpc_connection *);
585 int rxrpc_secure_packet(const struct rxrpc_call *, struct sk_buff *, size_t,
586                         void *);
587 int rxrpc_verify_packet(const struct rxrpc_call *, struct sk_buff *, u32 *);
588 void rxrpc_clear_conn_security(struct rxrpc_connection *);
589
590 /*
591  * ar-skbuff.c
592  */
593 void rxrpc_packet_destructor(struct sk_buff *);
594
595 /*
596  * ar-transport.c
597  */
598 extern unsigned rxrpc_transport_expiry;
599
600 struct rxrpc_transport *rxrpc_get_transport(struct rxrpc_local *,
601                                             struct rxrpc_peer *, gfp_t);
602 void rxrpc_put_transport(struct rxrpc_transport *);
603 void __exit rxrpc_destroy_all_transports(void);
604 struct rxrpc_transport *rxrpc_find_transport(struct rxrpc_local *,
605                                              struct rxrpc_peer *);
606
607 /*
608  * sysctl.c
609  */
610 #ifdef CONFIG_SYSCTL
611 extern int __init rxrpc_sysctl_init(void);
612 extern void rxrpc_sysctl_exit(void);
613 #else
614 static inline int __init rxrpc_sysctl_init(void) { return 0; }
615 static inline void rxrpc_sysctl_exit(void) {}
616 #endif
617
618 /*
619  * debug tracing
620  */
621 extern unsigned int rxrpc_debug;
622
623 #define dbgprintk(FMT,...) \
624         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
625
626 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
627 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
628 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
629 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
630 #define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)
631
632
633 #if defined(__KDEBUG)
634 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
635 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
636 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
637 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
638 #define _net(FMT,...)   knet(FMT,##__VA_ARGS__)
639
640 #elif defined(CONFIG_AF_RXRPC_DEBUG)
641 #define RXRPC_DEBUG_KENTER      0x01
642 #define RXRPC_DEBUG_KLEAVE      0x02
643 #define RXRPC_DEBUG_KDEBUG      0x04
644 #define RXRPC_DEBUG_KPROTO      0x08
645 #define RXRPC_DEBUG_KNET        0x10
646
647 #define _enter(FMT,...)                                 \
648 do {                                                    \
649         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
650                 kenter(FMT,##__VA_ARGS__);              \
651 } while (0)
652
653 #define _leave(FMT,...)                                 \
654 do {                                                    \
655         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
656                 kleave(FMT,##__VA_ARGS__);              \
657 } while (0)
658
659 #define _debug(FMT,...)                                 \
660 do {                                                    \
661         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
662                 kdebug(FMT,##__VA_ARGS__);              \
663 } while (0)
664
665 #define _proto(FMT,...)                                 \
666 do {                                                    \
667         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
668                 kproto(FMT,##__VA_ARGS__);              \
669 } while (0)
670
671 #define _net(FMT,...)                                   \
672 do {                                                    \
673         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))   \
674                 knet(FMT,##__VA_ARGS__);                \
675 } while (0)
676
677 #else
678 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
679 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
680 #define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
681 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
682 #define _net(FMT,...)   no_printk("@@@ "FMT ,##__VA_ARGS__)
683 #endif
684
685 /*
686  * debug assertion checking
687  */
688 #if 1 // defined(__KDEBUGALL)
689
690 #define ASSERT(X)                                               \
691 do {                                                            \
692         if (unlikely(!(X))) {                                   \
693                 printk(KERN_ERR "\n");                          \
694                 printk(KERN_ERR "RxRPC: Assertion failed\n");   \
695                 BUG();                                          \
696         }                                                       \
697 } while(0)
698
699 #define ASSERTCMP(X, OP, Y)                                             \
700 do {                                                                    \
701         if (unlikely(!((X) OP (Y)))) {                                  \
702                 printk(KERN_ERR "\n");                                  \
703                 printk(KERN_ERR "RxRPC: Assertion failed\n");           \
704                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
705                        (unsigned long)(X), (unsigned long)(Y));         \
706                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
707                        (unsigned long)(X), (unsigned long)(Y));         \
708                 BUG();                                                  \
709         }                                                               \
710 } while(0)
711
712 #define ASSERTIF(C, X)                                          \
713 do {                                                            \
714         if (unlikely((C) && !(X))) {                            \
715                 printk(KERN_ERR "\n");                          \
716                 printk(KERN_ERR "RxRPC: Assertion failed\n");   \
717                 BUG();                                          \
718         }                                                       \
719 } while(0)
720
721 #define ASSERTIFCMP(C, X, OP, Y)                                        \
722 do {                                                                    \
723         if (unlikely((C) && !((X) OP (Y)))) {                           \
724                 printk(KERN_ERR "\n");                                  \
725                 printk(KERN_ERR "RxRPC: Assertion failed\n");           \
726                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
727                        (unsigned long)(X), (unsigned long)(Y));         \
728                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
729                        (unsigned long)(X), (unsigned long)(Y));         \
730                 BUG();                                                  \
731         }                                                               \
732 } while(0)
733
734 #else
735
736 #define ASSERT(X)                               \
737 do {                                            \
738 } while(0)
739
740 #define ASSERTCMP(X, OP, Y)                     \
741 do {                                            \
742 } while(0)
743
744 #define ASSERTIF(C, X)                          \
745 do {                                            \
746 } while(0)
747
748 #define ASSERTIFCMP(C, X, OP, Y)                \
749 do {                                            \
750 } while(0)
751
752 #endif /* __KDEBUGALL */
753
754 /*
755  * socket buffer accounting / leak finding
756  */
757 static inline void __rxrpc_new_skb(struct sk_buff *skb, const char *fn)
758 {
759         //_net("new skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
760         //atomic_inc(&rxrpc_n_skbs);
761 }
762
763 #define rxrpc_new_skb(skb) __rxrpc_new_skb((skb), __func__)
764
765 static inline void __rxrpc_kill_skb(struct sk_buff *skb, const char *fn)
766 {
767         //_net("kill skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
768         //atomic_dec(&rxrpc_n_skbs);
769 }
770
771 #define rxrpc_kill_skb(skb) __rxrpc_kill_skb((skb), __func__)
772
773 static inline void __rxrpc_free_skb(struct sk_buff *skb, const char *fn)
774 {
775         if (skb) {
776                 CHECK_SLAB_OKAY(&skb->users);
777                 //_net("free skb %p %s [%d]",
778                 //     skb, fn, atomic_read(&rxrpc_n_skbs));
779                 //atomic_dec(&rxrpc_n_skbs);
780                 kfree_skb(skb);
781         }
782 }
783
784 #define rxrpc_free_skb(skb) __rxrpc_free_skb((skb), __func__)
785
786 static inline void rxrpc_purge_queue(struct sk_buff_head *list)
787 {
788         struct sk_buff *skb;
789         while ((skb = skb_dequeue((list))) != NULL)
790                 rxrpc_free_skb(skb);
791 }
792
793 static inline void __rxrpc_get_local(struct rxrpc_local *local, const char *f)
794 {
795         CHECK_SLAB_OKAY(&local->usage);
796         if (atomic_inc_return(&local->usage) == 1)
797                 printk("resurrected (%s)\n", f);
798 }
799
800 #define rxrpc_get_local(LOCAL) __rxrpc_get_local((LOCAL), __func__)
801
802 #define rxrpc_get_call(CALL)                            \
803 do {                                                    \
804         CHECK_SLAB_OKAY(&(CALL)->usage);                \
805         if (atomic_inc_return(&(CALL)->usage) == 1)     \
806                 BUG();                                  \
807 } while(0)
808
809 #define rxrpc_put_call(CALL)                            \
810 do {                                                    \
811         __rxrpc_put_call(CALL);                         \
812 } while(0)