Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[cascardo/linux.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 <linux/atomic.h>
13 #include <linux/seqlock.h>
14 #include <net/sock.h>
15 #include <net/af_rxrpc.h>
16 #include <rxrpc/packet.h>
17
18 #if 0
19 #define CHECK_SLAB_OKAY(X)                                   \
20         BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
21                (POISON_FREE << 8 | POISON_FREE))
22 #else
23 #define CHECK_SLAB_OKAY(X) do {} while (0)
24 #endif
25
26 #define FCRYPT_BSIZE 8
27 struct rxrpc_crypt {
28         union {
29                 u8      x[FCRYPT_BSIZE];
30                 __be32  n[2];
31         };
32 } __attribute__((aligned(8)));
33
34 #define rxrpc_queue_work(WS)    queue_work(rxrpc_workqueue, (WS))
35 #define rxrpc_queue_delayed_work(WS,D)  \
36         queue_delayed_work(rxrpc_workqueue, (WS), (D))
37
38 struct rxrpc_connection;
39
40 /*
41  * Mark applied to socket buffers.
42  */
43 enum rxrpc_skb_mark {
44         RXRPC_SKB_MARK_DATA,            /* data message */
45         RXRPC_SKB_MARK_FINAL_ACK,       /* final ACK received message */
46         RXRPC_SKB_MARK_BUSY,            /* server busy message */
47         RXRPC_SKB_MARK_REMOTE_ABORT,    /* remote abort message */
48         RXRPC_SKB_MARK_LOCAL_ABORT,     /* local abort message */
49         RXRPC_SKB_MARK_NET_ERROR,       /* network error message */
50         RXRPC_SKB_MARK_LOCAL_ERROR,     /* local error message */
51         RXRPC_SKB_MARK_NEW_CALL,        /* local error message */
52 };
53
54 /*
55  * sk_state for RxRPC sockets
56  */
57 enum {
58         RXRPC_UNBOUND = 0,
59         RXRPC_CLIENT_UNBOUND,           /* Unbound socket used as client */
60         RXRPC_CLIENT_BOUND,             /* client local address bound */
61         RXRPC_SERVER_BOUND,             /* server local address bound */
62         RXRPC_SERVER_LISTENING,         /* server listening for connections */
63         RXRPC_CLOSE,                    /* socket is being closed */
64 };
65
66 /*
67  * Service backlog preallocation.
68  *
69  * This contains circular buffers of preallocated peers, connections and calls
70  * for incoming service calls and their head and tail pointers.  This allows
71  * calls to be set up in the data_ready handler, thereby avoiding the need to
72  * shuffle packets around so much.
73  */
74 struct rxrpc_backlog {
75         unsigned short          peer_backlog_head;
76         unsigned short          peer_backlog_tail;
77         unsigned short          conn_backlog_head;
78         unsigned short          conn_backlog_tail;
79         unsigned short          call_backlog_head;
80         unsigned short          call_backlog_tail;
81 #define RXRPC_BACKLOG_MAX       32
82         struct rxrpc_peer       *peer_backlog[RXRPC_BACKLOG_MAX];
83         struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX];
84         struct rxrpc_call       *call_backlog[RXRPC_BACKLOG_MAX];
85 };
86
87 /*
88  * RxRPC socket definition
89  */
90 struct rxrpc_sock {
91         /* WARNING: sk has to be the first member */
92         struct sock             sk;
93         rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */
94         rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
95         struct rxrpc_local      *local;         /* local endpoint */
96         struct rxrpc_backlog    *backlog;       /* Preallocation for services */
97         spinlock_t              incoming_lock;  /* Incoming call vs service shutdown lock */
98         struct list_head        sock_calls;     /* List of calls owned by this socket */
99         struct list_head        to_be_accepted; /* calls awaiting acceptance */
100         struct list_head        recvmsg_q;      /* Calls awaiting recvmsg's attention  */
101         rwlock_t                recvmsg_lock;   /* Lock for recvmsg_q */
102         struct key              *key;           /* security for this socket */
103         struct key              *securities;    /* list of server security descriptors */
104         struct rb_root          calls;          /* User ID -> call mapping */
105         unsigned long           flags;
106 #define RXRPC_SOCK_CONNECTED            0       /* connect_srx is set */
107         rwlock_t                call_lock;      /* lock for calls */
108         u32                     min_sec_level;  /* minimum security level */
109 #define RXRPC_SECURITY_MAX      RXRPC_SECURITY_ENCRYPT
110         bool                    exclusive;      /* Exclusive connection for a client socket */
111         sa_family_t             family;         /* Protocol family created with */
112         struct sockaddr_rxrpc   srx;            /* local address */
113         struct sockaddr_rxrpc   connect_srx;    /* Default client address from connect() */
114 };
115
116 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
117
118 /*
119  * CPU-byteorder normalised Rx packet header.
120  */
121 struct rxrpc_host_header {
122         u32             epoch;          /* client boot timestamp */
123         u32             cid;            /* connection and channel ID */
124         u32             callNumber;     /* call ID (0 for connection-level packets) */
125         u32             seq;            /* sequence number of pkt in call stream */
126         u32             serial;         /* serial number of pkt sent to network */
127         u8              type;           /* packet type */
128         u8              flags;          /* packet flags */
129         u8              userStatus;     /* app-layer defined status */
130         u8              securityIndex;  /* security protocol ID */
131         union {
132                 u16     _rsvd;          /* reserved */
133                 u16     cksum;          /* kerberos security checksum */
134         };
135         u16             serviceId;      /* service ID */
136 } __packed;
137
138 /*
139  * RxRPC socket buffer private variables
140  * - max 48 bytes (struct sk_buff::cb)
141  */
142 struct rxrpc_skb_priv {
143         union {
144                 u8              nr_jumbo;       /* Number of jumbo subpackets */
145         };
146         union {
147                 int             remain;         /* amount of space remaining for next write */
148         };
149
150         struct rxrpc_host_header hdr;           /* RxRPC packet header from this packet */
151 };
152
153 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
154
155 /*
156  * RxRPC security module interface
157  */
158 struct rxrpc_security {
159         const char              *name;          /* name of this service */
160         u8                      security_index; /* security type provided */
161
162         /* Initialise a security service */
163         int (*init)(void);
164
165         /* Clean up a security service */
166         void (*exit)(void);
167
168         /* initialise a connection's security */
169         int (*init_connection_security)(struct rxrpc_connection *);
170
171         /* prime a connection's packet security */
172         int (*prime_packet_security)(struct rxrpc_connection *);
173
174         /* impose security on a packet */
175         int (*secure_packet)(struct rxrpc_call *,
176                              struct sk_buff *,
177                              size_t,
178                              void *);
179
180         /* verify the security on a received packet */
181         int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,
182                              unsigned int, unsigned int, rxrpc_seq_t, u16);
183
184         /* Locate the data in a received packet that has been verified. */
185         void (*locate_data)(struct rxrpc_call *, struct sk_buff *,
186                             unsigned int *, unsigned int *);
187
188         /* issue a challenge */
189         int (*issue_challenge)(struct rxrpc_connection *);
190
191         /* respond to a challenge */
192         int (*respond_to_challenge)(struct rxrpc_connection *,
193                                     struct sk_buff *,
194                                     u32 *);
195
196         /* verify a response */
197         int (*verify_response)(struct rxrpc_connection *,
198                                struct sk_buff *,
199                                u32 *);
200
201         /* clear connection security */
202         void (*clear)(struct rxrpc_connection *);
203 };
204
205 /*
206  * RxRPC local transport endpoint description
207  * - owned by a single AF_RXRPC socket
208  * - pointed to by transport socket struct sk_user_data
209  */
210 struct rxrpc_local {
211         struct rcu_head         rcu;
212         atomic_t                usage;
213         struct list_head        link;
214         struct socket           *socket;        /* my UDP socket */
215         struct work_struct      processor;
216         struct rxrpc_sock __rcu *service;       /* Service(s) listening on this endpoint */
217         struct rw_semaphore     defrag_sem;     /* control re-enablement of IP DF bit */
218         struct sk_buff_head     reject_queue;   /* packets awaiting rejection */
219         struct sk_buff_head     event_queue;    /* endpoint event packets awaiting processing */
220         struct rb_root          client_conns;   /* Client connections by socket params */
221         spinlock_t              client_conns_lock; /* Lock for client_conns */
222         spinlock_t              lock;           /* access lock */
223         rwlock_t                services_lock;  /* lock for services list */
224         int                     debug_id;       /* debug ID for printks */
225         bool                    dead;
226         struct sockaddr_rxrpc   srx;            /* local address */
227 };
228
229 /*
230  * RxRPC remote transport endpoint definition
231  * - matched by local endpoint, remote port, address and protocol type
232  */
233 struct rxrpc_peer {
234         struct rcu_head         rcu;            /* This must be first */
235         atomic_t                usage;
236         unsigned long           hash_key;
237         struct hlist_node       hash_link;
238         struct rxrpc_local      *local;
239         struct hlist_head       error_targets;  /* targets for net error distribution */
240         struct work_struct      error_distributor;
241         struct rb_root          service_conns;  /* Service connections */
242         seqlock_t               service_conn_lock;
243         spinlock_t              lock;           /* access lock */
244         unsigned int            if_mtu;         /* interface MTU for this peer */
245         unsigned int            mtu;            /* network MTU for this peer */
246         unsigned int            maxdata;        /* data size (MTU - hdrsize) */
247         unsigned short          hdrsize;        /* header size (IP + UDP + RxRPC) */
248         int                     debug_id;       /* debug ID for printks */
249         int                     error_report;   /* Net (+0) or local (+1000000) to distribute */
250 #define RXRPC_LOCAL_ERROR_OFFSET 1000000
251         struct sockaddr_rxrpc   srx;            /* remote address */
252
253         /* calculated RTT cache */
254 #define RXRPC_RTT_CACHE_SIZE 32
255         ktime_t                 rtt_last_req;   /* Time of last RTT request */
256         u64                     rtt;            /* Current RTT estimate (in nS) */
257         u64                     rtt_sum;        /* Sum of cache contents */
258         u64                     rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* Determined RTT cache */
259         u8                      rtt_cursor;     /* next entry at which to insert */
260         u8                      rtt_usage;      /* amount of cache actually used */
261 };
262
263 /*
264  * Keys for matching a connection.
265  */
266 struct rxrpc_conn_proto {
267         union {
268                 struct {
269                         u32     epoch;          /* epoch of this connection */
270                         u32     cid;            /* connection ID */
271                 };
272                 u64             index_key;
273         };
274 };
275
276 struct rxrpc_conn_parameters {
277         struct rxrpc_local      *local;         /* Representation of local endpoint */
278         struct rxrpc_peer       *peer;          /* Remote endpoint */
279         struct key              *key;           /* Security details */
280         bool                    exclusive;      /* T if conn is exclusive */
281         u16                     service_id;     /* Service ID for this connection */
282         u32                     security_level; /* Security level selected */
283 };
284
285 /*
286  * Bits in the connection flags.
287  */
288 enum rxrpc_conn_flag {
289         RXRPC_CONN_HAS_IDR,             /* Has a client conn ID assigned */
290         RXRPC_CONN_IN_SERVICE_CONNS,    /* Conn is in peer->service_conns */
291         RXRPC_CONN_IN_CLIENT_CONNS,     /* Conn is in local->client_conns */
292         RXRPC_CONN_EXPOSED,             /* Conn has extra ref for exposure */
293         RXRPC_CONN_DONT_REUSE,          /* Don't reuse this connection */
294         RXRPC_CONN_COUNTED,             /* Counted by rxrpc_nr_client_conns */
295 };
296
297 /*
298  * Events that can be raised upon a connection.
299  */
300 enum rxrpc_conn_event {
301         RXRPC_CONN_EV_CHALLENGE,        /* Send challenge packet */
302 };
303
304 /*
305  * The connection cache state.
306  */
307 enum rxrpc_conn_cache_state {
308         RXRPC_CONN_CLIENT_INACTIVE,     /* Conn is not yet listed */
309         RXRPC_CONN_CLIENT_WAITING,      /* Conn is on wait list, waiting for capacity */
310         RXRPC_CONN_CLIENT_ACTIVE,       /* Conn is on active list, doing calls */
311         RXRPC_CONN_CLIENT_CULLED,       /* Conn is culled and delisted, doing calls */
312         RXRPC_CONN_CLIENT_IDLE,         /* Conn is on idle list, doing mostly nothing */
313         RXRPC_CONN__NR_CACHE_STATES
314 };
315
316 /*
317  * The connection protocol state.
318  */
319 enum rxrpc_conn_proto_state {
320         RXRPC_CONN_UNUSED,              /* Connection not yet attempted */
321         RXRPC_CONN_CLIENT,              /* Client connection */
322         RXRPC_CONN_SERVICE_PREALLOC,    /* Service connection preallocation */
323         RXRPC_CONN_SERVICE_UNSECURED,   /* Service unsecured connection */
324         RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */
325         RXRPC_CONN_SERVICE,             /* Service secured connection */
326         RXRPC_CONN_REMOTELY_ABORTED,    /* Conn aborted by peer */
327         RXRPC_CONN_LOCALLY_ABORTED,     /* Conn aborted locally */
328         RXRPC_CONN__NR_STATES
329 };
330
331 /*
332  * RxRPC connection definition
333  * - matched by { local, peer, epoch, conn_id, direction }
334  * - each connection can only handle four simultaneous calls
335  */
336 struct rxrpc_connection {
337         struct rxrpc_conn_proto proto;
338         struct rxrpc_conn_parameters params;
339
340         atomic_t                usage;
341         struct rcu_head         rcu;
342         struct list_head        cache_link;
343
344         spinlock_t              channel_lock;
345         unsigned char           active_chans;   /* Mask of active channels */
346 #define RXRPC_ACTIVE_CHANS_MASK ((1 << RXRPC_MAXCALLS) - 1)
347         struct list_head        waiting_calls;  /* Calls waiting for channels */
348         struct rxrpc_channel {
349                 struct rxrpc_call __rcu *call;          /* Active call */
350                 u32                     call_id;        /* ID of current call */
351                 u32                     call_counter;   /* Call ID counter */
352                 u32                     last_call;      /* ID of last call */
353                 u8                      last_type;      /* Type of last packet */
354                 u16                     last_service_id;
355                 union {
356                         u32             last_seq;
357                         u32             last_abort;
358                 };
359         } channels[RXRPC_MAXCALLS];
360
361         struct work_struct      processor;      /* connection event processor */
362         union {
363                 struct rb_node  client_node;    /* Node in local->client_conns */
364                 struct rb_node  service_node;   /* Node in peer->service_conns */
365         };
366         struct list_head        proc_link;      /* link in procfs list */
367         struct list_head        link;           /* link in master connection list */
368         struct sk_buff_head     rx_queue;       /* received conn-level packets */
369         const struct rxrpc_security *security;  /* applied security module */
370         struct key              *server_key;    /* security for this service */
371         struct crypto_skcipher  *cipher;        /* encryption handle */
372         struct rxrpc_crypt      csum_iv;        /* packet checksum base */
373         unsigned long           flags;
374         unsigned long           events;
375         unsigned long           idle_timestamp; /* Time at which last became idle */
376         spinlock_t              state_lock;     /* state-change lock */
377         enum rxrpc_conn_cache_state cache_state;
378         enum rxrpc_conn_proto_state state;      /* current state of connection */
379         u32                     local_abort;    /* local abort code */
380         u32                     remote_abort;   /* remote abort code */
381         int                     debug_id;       /* debug ID for printks */
382         atomic_t                serial;         /* packet serial number counter */
383         unsigned int            hi_serial;      /* highest serial number received */
384         u32                     security_nonce; /* response re-use preventer */
385         u8                      size_align;     /* data size alignment (for security) */
386         u8                      security_size;  /* security header size */
387         u8                      security_ix;    /* security type */
388         u8                      out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
389 };
390
391 /*
392  * Flags in call->flags.
393  */
394 enum rxrpc_call_flag {
395         RXRPC_CALL_RELEASED,            /* call has been released - no more message to userspace */
396         RXRPC_CALL_HAS_USERID,          /* has a user ID attached */
397         RXRPC_CALL_IS_SERVICE,          /* Call is service call */
398         RXRPC_CALL_EXPOSED,             /* The call was exposed to the world */
399         RXRPC_CALL_RX_LAST,             /* Received the last packet (at rxtx_top) */
400         RXRPC_CALL_TX_LAST,             /* Last packet in Tx buffer (at rxtx_top) */
401         RXRPC_CALL_SEND_PING,           /* A ping will need to be sent */
402         RXRPC_CALL_PINGING,             /* Ping in process */
403         RXRPC_CALL_RETRANS_TIMEOUT,     /* Retransmission due to timeout occurred */
404 };
405
406 /*
407  * Events that can be raised on a call.
408  */
409 enum rxrpc_call_event {
410         RXRPC_CALL_EV_ACK,              /* need to generate ACK */
411         RXRPC_CALL_EV_ABORT,            /* need to generate abort */
412         RXRPC_CALL_EV_TIMER,            /* Timer expired */
413         RXRPC_CALL_EV_RESEND,           /* Tx resend required */
414         RXRPC_CALL_EV_PING,             /* Ping send required */
415 };
416
417 /*
418  * The states that a call can be in.
419  */
420 enum rxrpc_call_state {
421         RXRPC_CALL_UNINITIALISED,
422         RXRPC_CALL_CLIENT_AWAIT_CONN,   /* - client waiting for connection to become available */
423         RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
424         RXRPC_CALL_CLIENT_AWAIT_REPLY,  /* - client awaiting reply */
425         RXRPC_CALL_CLIENT_RECV_REPLY,   /* - client receiving reply phase */
426         RXRPC_CALL_SERVER_PREALLOC,     /* - service preallocation */
427         RXRPC_CALL_SERVER_SECURING,     /* - server securing request connection */
428         RXRPC_CALL_SERVER_ACCEPTING,    /* - server accepting request */
429         RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
430         RXRPC_CALL_SERVER_ACK_REQUEST,  /* - server pending ACK of request */
431         RXRPC_CALL_SERVER_SEND_REPLY,   /* - server sending reply */
432         RXRPC_CALL_SERVER_AWAIT_ACK,    /* - server awaiting final ACK */
433         RXRPC_CALL_COMPLETE,            /* - call complete */
434         NR__RXRPC_CALL_STATES
435 };
436
437 /*
438  * Call completion condition (state == RXRPC_CALL_COMPLETE).
439  */
440 enum rxrpc_call_completion {
441         RXRPC_CALL_SUCCEEDED,           /* - Normal termination */
442         RXRPC_CALL_REMOTELY_ABORTED,    /* - call aborted by peer */
443         RXRPC_CALL_LOCALLY_ABORTED,     /* - call aborted locally on error or close */
444         RXRPC_CALL_LOCAL_ERROR,         /* - call failed due to local error */
445         RXRPC_CALL_NETWORK_ERROR,       /* - call terminated by network error */
446         NR__RXRPC_CALL_COMPLETIONS
447 };
448
449 /*
450  * Call Tx congestion management modes.
451  */
452 enum rxrpc_congest_mode {
453         RXRPC_CALL_SLOW_START,
454         RXRPC_CALL_CONGEST_AVOIDANCE,
455         RXRPC_CALL_PACKET_LOSS,
456         RXRPC_CALL_FAST_RETRANSMIT,
457         NR__RXRPC_CONGEST_MODES
458 };
459
460 /*
461  * RxRPC call definition
462  * - matched by { connection, call_id }
463  */
464 struct rxrpc_call {
465         struct rcu_head         rcu;
466         struct rxrpc_connection *conn;          /* connection carrying call */
467         struct rxrpc_peer       *peer;          /* Peer record for remote address */
468         struct rxrpc_sock __rcu *socket;        /* socket responsible */
469         ktime_t                 ack_at;         /* When deferred ACK needs to happen */
470         ktime_t                 resend_at;      /* When next resend needs to happen */
471         ktime_t                 ping_at;        /* When next to send a ping */
472         ktime_t                 expire_at;      /* When the call times out */
473         struct timer_list       timer;          /* Combined event timer */
474         struct work_struct      processor;      /* Event processor */
475         rxrpc_notify_rx_t       notify_rx;      /* kernel service Rx notification function */
476         struct list_head        link;           /* link in master call list */
477         struct list_head        chan_wait_link; /* Link in conn->waiting_calls */
478         struct hlist_node       error_link;     /* link in error distribution list */
479         struct list_head        accept_link;    /* Link in rx->acceptq */
480         struct list_head        recvmsg_link;   /* Link in rx->recvmsg_q */
481         struct list_head        sock_link;      /* Link in rx->sock_calls */
482         struct rb_node          sock_node;      /* Node in rx->calls */
483         struct sk_buff          *tx_pending;    /* Tx socket buffer being filled */
484         wait_queue_head_t       waitq;          /* Wait queue for channel or Tx */
485         __be32                  crypto_buf[2];  /* Temporary packet crypto buffer */
486         unsigned long           user_call_ID;   /* user-defined call ID */
487         unsigned long           flags;
488         unsigned long           events;
489         spinlock_t              lock;
490         rwlock_t                state_lock;     /* lock for state transition */
491         u32                     abort_code;     /* Local/remote abort code */
492         int                     error;          /* Local error incurred */
493         enum rxrpc_call_state   state;          /* current state of call */
494         enum rxrpc_call_completion completion;  /* Call completion condition */
495         atomic_t                usage;
496         u16                     service_id;     /* service ID */
497         u8                      security_ix;    /* Security type */
498         u32                     call_id;        /* call ID on connection  */
499         u32                     cid;            /* connection ID plus channel index */
500         int                     debug_id;       /* debug ID for printks */
501         unsigned short          rx_pkt_offset;  /* Current recvmsg packet offset */
502         unsigned short          rx_pkt_len;     /* Current recvmsg packet len */
503
504         /* Rx/Tx circular buffer, depending on phase.
505          *
506          * In the Rx phase, packets are annotated with 0 or the number of the
507          * segment of a jumbo packet each buffer refers to.  There can be up to
508          * 47 segments in a maximum-size UDP packet.
509          *
510          * In the Tx phase, packets are annotated with which buffers have been
511          * acked.
512          */
513 #define RXRPC_RXTX_BUFF_SIZE    64
514 #define RXRPC_RXTX_BUFF_MASK    (RXRPC_RXTX_BUFF_SIZE - 1)
515 #define RXRPC_INIT_RX_WINDOW_SIZE 32
516         struct sk_buff          **rxtx_buffer;
517         u8                      *rxtx_annotations;
518 #define RXRPC_TX_ANNO_ACK       0
519 #define RXRPC_TX_ANNO_UNACK     1
520 #define RXRPC_TX_ANNO_NAK       2
521 #define RXRPC_TX_ANNO_RETRANS   3
522 #define RXRPC_TX_ANNO_MASK      0x03
523 #define RXRPC_TX_ANNO_LAST      0x04
524 #define RXRPC_TX_ANNO_RESENT    0x08
525
526 #define RXRPC_RX_ANNO_JUMBO     0x3f            /* Jumbo subpacket number + 1 if not zero */
527 #define RXRPC_RX_ANNO_JLAST     0x40            /* Set if last element of a jumbo packet */
528 #define RXRPC_RX_ANNO_VERIFIED  0x80            /* Set if verified and decrypted */
529         rxrpc_seq_t             tx_hard_ack;    /* Dead slot in buffer; the first transmitted but
530                                                  * not hard-ACK'd packet follows this.
531                                                  */
532         rxrpc_seq_t             tx_top;         /* Highest Tx slot allocated. */
533
534         /* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
535          * is fixed, we keep these numbers in terms of segments (ie. DATA
536          * packets) rather than bytes.
537          */
538 #define RXRPC_TX_SMSS           RXRPC_JUMBO_DATALEN
539         u8                      cong_cwnd;      /* Congestion window size */
540         u8                      cong_extra;     /* Extra to send for congestion management */
541         u8                      cong_ssthresh;  /* Slow-start threshold */
542         enum rxrpc_congest_mode cong_mode:8;    /* Congestion management mode */
543         u8                      cong_dup_acks;  /* Count of ACKs showing missing packets */
544         u8                      cong_cumul_acks; /* Cumulative ACK count */
545         ktime_t                 cong_tstamp;    /* Last time cwnd was changed */
546
547         rxrpc_seq_t             rx_hard_ack;    /* Dead slot in buffer; the first received but not
548                                                  * consumed packet follows this.
549                                                  */
550         rxrpc_seq_t             rx_top;         /* Highest Rx slot allocated. */
551         rxrpc_seq_t             rx_expect_next; /* Expected next packet sequence number */
552         u8                      rx_winsize;     /* Size of Rx window */
553         u8                      tx_winsize;     /* Maximum size of Tx window */
554         bool                    tx_phase;       /* T if transmission phase, F if receive phase */
555         u8                      nr_jumbo_bad;   /* Number of jumbo dups/exceeds-windows */
556
557         /* receive-phase ACK management */
558         u8                      ackr_reason;    /* reason to ACK */
559         u16                     ackr_skew;      /* skew on packet being ACK'd */
560         rxrpc_serial_t          ackr_serial;    /* serial of packet being ACK'd */
561         rxrpc_seq_t             ackr_prev_seq;  /* previous sequence number received */
562         rxrpc_seq_t             ackr_consumed;  /* Highest packet shown consumed */
563         rxrpc_seq_t             ackr_seen;      /* Highest packet shown seen */
564
565         /* ping management */
566         rxrpc_serial_t          ping_serial;    /* Last ping sent */
567         ktime_t                 ping_time;      /* Time last ping sent */
568
569         /* transmission-phase ACK management */
570         ktime_t                 acks_latest_ts; /* Timestamp of latest ACK received */
571         rxrpc_serial_t          acks_latest;    /* serial number of latest ACK received */
572         rxrpc_seq_t             acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
573 };
574
575 /*
576  * Summary of a new ACK and the changes it made to the Tx buffer packet states.
577  */
578 struct rxrpc_ack_summary {
579         u8                      ack_reason;
580         u8                      nr_acks;                /* Number of ACKs in packet */
581         u8                      nr_nacks;               /* Number of NACKs in packet */
582         u8                      nr_new_acks;            /* Number of new ACKs in packet */
583         u8                      nr_new_nacks;           /* Number of new NACKs in packet */
584         u8                      nr_rot_new_acks;        /* Number of rotated new ACKs */
585         bool                    new_low_nack;           /* T if new low NACK found */
586         bool                    retrans_timeo;          /* T if reTx due to timeout happened */
587         u8                      flight_size;            /* Number of unreceived transmissions */
588         /* Place to stash values for tracing */
589         enum rxrpc_congest_mode mode:8;
590         u8                      cwnd;
591         u8                      ssthresh;
592         u8                      dup_acks;
593         u8                      cumulative_acks;
594 };
595
596 enum rxrpc_skb_trace {
597         rxrpc_skb_rx_cleaned,
598         rxrpc_skb_rx_freed,
599         rxrpc_skb_rx_got,
600         rxrpc_skb_rx_lost,
601         rxrpc_skb_rx_received,
602         rxrpc_skb_rx_rotated,
603         rxrpc_skb_rx_purged,
604         rxrpc_skb_rx_seen,
605         rxrpc_skb_tx_cleaned,
606         rxrpc_skb_tx_freed,
607         rxrpc_skb_tx_got,
608         rxrpc_skb_tx_new,
609         rxrpc_skb_tx_rotated,
610         rxrpc_skb_tx_seen,
611         rxrpc_skb__nr_trace
612 };
613
614 extern const char rxrpc_skb_traces[rxrpc_skb__nr_trace][7];
615
616 enum rxrpc_conn_trace {
617         rxrpc_conn_new_client,
618         rxrpc_conn_new_service,
619         rxrpc_conn_queued,
620         rxrpc_conn_seen,
621         rxrpc_conn_got,
622         rxrpc_conn_put_client,
623         rxrpc_conn_put_service,
624         rxrpc_conn__nr_trace
625 };
626
627 extern const char rxrpc_conn_traces[rxrpc_conn__nr_trace][4];
628
629 enum rxrpc_client_trace {
630         rxrpc_client_activate_chans,
631         rxrpc_client_alloc,
632         rxrpc_client_chan_activate,
633         rxrpc_client_chan_disconnect,
634         rxrpc_client_chan_pass,
635         rxrpc_client_chan_unstarted,
636         rxrpc_client_cleanup,
637         rxrpc_client_count,
638         rxrpc_client_discard,
639         rxrpc_client_duplicate,
640         rxrpc_client_exposed,
641         rxrpc_client_replace,
642         rxrpc_client_to_active,
643         rxrpc_client_to_culled,
644         rxrpc_client_to_idle,
645         rxrpc_client_to_inactive,
646         rxrpc_client_to_waiting,
647         rxrpc_client_uncount,
648         rxrpc_client__nr_trace
649 };
650
651 extern const char rxrpc_client_traces[rxrpc_client__nr_trace][7];
652 extern const char rxrpc_conn_cache_states[RXRPC_CONN__NR_CACHE_STATES][5];
653
654 enum rxrpc_call_trace {
655         rxrpc_call_new_client,
656         rxrpc_call_new_service,
657         rxrpc_call_queued,
658         rxrpc_call_queued_ref,
659         rxrpc_call_seen,
660         rxrpc_call_connected,
661         rxrpc_call_release,
662         rxrpc_call_got,
663         rxrpc_call_got_userid,
664         rxrpc_call_got_kernel,
665         rxrpc_call_put,
666         rxrpc_call_put_userid,
667         rxrpc_call_put_kernel,
668         rxrpc_call_put_noqueue,
669         rxrpc_call_error,
670         rxrpc_call__nr_trace
671 };
672
673 extern const char rxrpc_call_traces[rxrpc_call__nr_trace][4];
674
675 enum rxrpc_transmit_trace {
676         rxrpc_transmit_wait,
677         rxrpc_transmit_queue,
678         rxrpc_transmit_queue_last,
679         rxrpc_transmit_rotate,
680         rxrpc_transmit_rotate_last,
681         rxrpc_transmit_await_reply,
682         rxrpc_transmit_end,
683         rxrpc_transmit__nr_trace
684 };
685
686 extern const char rxrpc_transmit_traces[rxrpc_transmit__nr_trace][4];
687
688 enum rxrpc_receive_trace {
689         rxrpc_receive_incoming,
690         rxrpc_receive_queue,
691         rxrpc_receive_queue_last,
692         rxrpc_receive_front,
693         rxrpc_receive_rotate,
694         rxrpc_receive_end,
695         rxrpc_receive__nr_trace
696 };
697
698 extern const char rxrpc_receive_traces[rxrpc_receive__nr_trace][4];
699
700 enum rxrpc_recvmsg_trace {
701         rxrpc_recvmsg_enter,
702         rxrpc_recvmsg_wait,
703         rxrpc_recvmsg_dequeue,
704         rxrpc_recvmsg_hole,
705         rxrpc_recvmsg_next,
706         rxrpc_recvmsg_cont,
707         rxrpc_recvmsg_full,
708         rxrpc_recvmsg_data_return,
709         rxrpc_recvmsg_terminal,
710         rxrpc_recvmsg_to_be_accepted,
711         rxrpc_recvmsg_return,
712         rxrpc_recvmsg__nr_trace
713 };
714
715 extern const char rxrpc_recvmsg_traces[rxrpc_recvmsg__nr_trace][5];
716
717 enum rxrpc_rtt_tx_trace {
718         rxrpc_rtt_tx_ping,
719         rxrpc_rtt_tx_data,
720         rxrpc_rtt_tx__nr_trace
721 };
722
723 extern const char rxrpc_rtt_tx_traces[rxrpc_rtt_tx__nr_trace][5];
724
725 enum rxrpc_rtt_rx_trace {
726         rxrpc_rtt_rx_ping_response,
727         rxrpc_rtt_rx_requested_ack,
728         rxrpc_rtt_rx__nr_trace
729 };
730
731 extern const char rxrpc_rtt_rx_traces[rxrpc_rtt_rx__nr_trace][5];
732
733 enum rxrpc_timer_trace {
734         rxrpc_timer_begin,
735         rxrpc_timer_init_for_reply,
736         rxrpc_timer_init_for_send_reply,
737         rxrpc_timer_expired,
738         rxrpc_timer_set_for_ack,
739         rxrpc_timer_set_for_ping,
740         rxrpc_timer_set_for_resend,
741         rxrpc_timer_set_for_send,
742         rxrpc_timer__nr_trace
743 };
744
745 extern const char rxrpc_timer_traces[rxrpc_timer__nr_trace][8];
746
747 enum rxrpc_propose_ack_trace {
748         rxrpc_propose_ack_client_tx_end,
749         rxrpc_propose_ack_input_data,
750         rxrpc_propose_ack_ping_for_lost_ack,
751         rxrpc_propose_ack_ping_for_lost_reply,
752         rxrpc_propose_ack_ping_for_params,
753         rxrpc_propose_ack_processing_op,
754         rxrpc_propose_ack_respond_to_ack,
755         rxrpc_propose_ack_respond_to_ping,
756         rxrpc_propose_ack_retry_tx,
757         rxrpc_propose_ack_rotate_rx,
758         rxrpc_propose_ack_terminal_ack,
759         rxrpc_propose_ack__nr_trace
760 };
761
762 enum rxrpc_propose_ack_outcome {
763         rxrpc_propose_ack_use,
764         rxrpc_propose_ack_update,
765         rxrpc_propose_ack_subsume,
766         rxrpc_propose_ack__nr_outcomes
767 };
768
769 extern const char rxrpc_propose_ack_traces[rxrpc_propose_ack__nr_trace][8];
770 extern const char *const rxrpc_propose_ack_outcomes[rxrpc_propose_ack__nr_outcomes];
771
772 enum rxrpc_congest_change {
773         rxrpc_cong_begin_retransmission,
774         rxrpc_cong_cleared_nacks,
775         rxrpc_cong_new_low_nack,
776         rxrpc_cong_no_change,
777         rxrpc_cong_progress,
778         rxrpc_cong_retransmit_again,
779         rxrpc_cong_rtt_window_end,
780         rxrpc_cong_saw_nack,
781         rxrpc_congest__nr_change
782 };
783
784 extern const char rxrpc_congest_modes[NR__RXRPC_CONGEST_MODES][10];
785 extern const char rxrpc_congest_changes[rxrpc_congest__nr_change][9];
786
787 extern const char *const rxrpc_pkts[];
788 extern const char rxrpc_ack_names[RXRPC_ACK__INVALID + 1][4];
789
790 #include <trace/events/rxrpc.h>
791
792 /*
793  * af_rxrpc.c
794  */
795 extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
796 extern u32 rxrpc_epoch;
797 extern atomic_t rxrpc_debug_id;
798 extern struct workqueue_struct *rxrpc_workqueue;
799
800 /*
801  * call_accept.c
802  */
803 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
804 void rxrpc_discard_prealloc(struct rxrpc_sock *);
805 struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
806                                            struct rxrpc_connection *,
807                                            struct sk_buff *);
808 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
809 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long,
810                                      rxrpc_notify_rx_t);
811 int rxrpc_reject_call(struct rxrpc_sock *);
812
813 /*
814  * call_event.c
815  */
816 void __rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace, ktime_t);
817 void rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace, ktime_t);
818 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool,
819                        enum rxrpc_propose_ack_trace);
820 void rxrpc_process_call(struct work_struct *);
821
822 /*
823  * call_object.c
824  */
825 extern const char *const rxrpc_call_states[];
826 extern const char *const rxrpc_call_completions[];
827 extern unsigned int rxrpc_max_call_lifetime;
828 extern struct kmem_cache *rxrpc_call_jar;
829 extern struct list_head rxrpc_calls;
830 extern rwlock_t rxrpc_call_lock;
831
832 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
833 struct rxrpc_call *rxrpc_alloc_call(gfp_t);
834 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
835                                          struct rxrpc_conn_parameters *,
836                                          struct sockaddr_rxrpc *,
837                                          unsigned long, gfp_t);
838 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
839                          struct sk_buff *);
840 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
841 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
842 bool __rxrpc_queue_call(struct rxrpc_call *);
843 bool rxrpc_queue_call(struct rxrpc_call *);
844 void rxrpc_see_call(struct rxrpc_call *);
845 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
846 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
847 void rxrpc_cleanup_call(struct rxrpc_call *);
848 void __exit rxrpc_destroy_all_calls(void);
849
850 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
851 {
852         return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
853 }
854
855 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
856 {
857         return !rxrpc_is_service_call(call);
858 }
859
860 /*
861  * Transition a call to the complete state.
862  */
863 static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call,
864                                                enum rxrpc_call_completion compl,
865                                                u32 abort_code,
866                                                int error)
867 {
868         if (call->state < RXRPC_CALL_COMPLETE) {
869                 call->abort_code = abort_code;
870                 call->error = error;
871                 call->completion = compl,
872                 call->state = RXRPC_CALL_COMPLETE;
873                 wake_up(&call->waitq);
874                 return true;
875         }
876         return false;
877 }
878
879 static inline bool rxrpc_set_call_completion(struct rxrpc_call *call,
880                                              enum rxrpc_call_completion compl,
881                                              u32 abort_code,
882                                              int error)
883 {
884         bool ret;
885
886         write_lock_bh(&call->state_lock);
887         ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
888         write_unlock_bh(&call->state_lock);
889         return ret;
890 }
891
892 /*
893  * Record that a call successfully completed.
894  */
895 static inline bool __rxrpc_call_completed(struct rxrpc_call *call)
896 {
897         return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0);
898 }
899
900 static inline bool rxrpc_call_completed(struct rxrpc_call *call)
901 {
902         bool ret;
903
904         write_lock_bh(&call->state_lock);
905         ret = __rxrpc_call_completed(call);
906         write_unlock_bh(&call->state_lock);
907         return ret;
908 }
909
910 /*
911  * Record that a call is locally aborted.
912  */
913 static inline bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call,
914                                       rxrpc_seq_t seq,
915                                       u32 abort_code, int error)
916 {
917         trace_rxrpc_abort(why, call->cid, call->call_id, seq,
918                           abort_code, error);
919         return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED,
920                                            abort_code, error);
921 }
922
923 static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call,
924                                     rxrpc_seq_t seq, u32 abort_code, int error)
925 {
926         bool ret;
927
928         write_lock_bh(&call->state_lock);
929         ret = __rxrpc_abort_call(why, call, seq, abort_code, error);
930         write_unlock_bh(&call->state_lock);
931         return ret;
932 }
933
934 /*
935  * conn_client.c
936  */
937 extern unsigned int rxrpc_max_client_connections;
938 extern unsigned int rxrpc_reap_client_connections;
939 extern unsigned int rxrpc_conn_idle_client_expiry;
940 extern unsigned int rxrpc_conn_idle_client_fast_expiry;
941 extern struct idr rxrpc_client_conn_ids;
942
943 void rxrpc_destroy_client_conn_ids(void);
944 int rxrpc_connect_call(struct rxrpc_call *, struct rxrpc_conn_parameters *,
945                        struct sockaddr_rxrpc *, gfp_t);
946 void rxrpc_expose_client_call(struct rxrpc_call *);
947 void rxrpc_disconnect_client_call(struct rxrpc_call *);
948 void rxrpc_put_client_conn(struct rxrpc_connection *);
949 void __exit rxrpc_destroy_all_client_connections(void);
950
951 /*
952  * conn_event.c
953  */
954 void rxrpc_process_connection(struct work_struct *);
955
956 /*
957  * conn_object.c
958  */
959 extern unsigned int rxrpc_connection_expiry;
960 extern struct list_head rxrpc_connections;
961 extern struct list_head rxrpc_connection_proc_list;
962 extern rwlock_t rxrpc_connection_lock;
963
964 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
965 struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
966 struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
967                                                    struct sk_buff *);
968 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
969 void rxrpc_disconnect_call(struct rxrpc_call *);
970 void rxrpc_kill_connection(struct rxrpc_connection *);
971 bool rxrpc_queue_conn(struct rxrpc_connection *);
972 void rxrpc_see_connection(struct rxrpc_connection *);
973 void rxrpc_get_connection(struct rxrpc_connection *);
974 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *);
975 void rxrpc_put_service_conn(struct rxrpc_connection *);
976 void __exit rxrpc_destroy_all_connections(void);
977
978 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
979 {
980         return conn->out_clientflag;
981 }
982
983 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
984 {
985         return !rxrpc_conn_is_client(conn);
986 }
987
988 static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
989 {
990         if (!conn)
991                 return;
992
993         if (rxrpc_conn_is_client(conn))
994                 rxrpc_put_client_conn(conn);
995         else
996                 rxrpc_put_service_conn(conn);
997 }
998
999 /*
1000  * conn_service.c
1001  */
1002 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
1003                                                      struct sk_buff *);
1004 struct rxrpc_connection *rxrpc_prealloc_service_connection(gfp_t);
1005 void rxrpc_new_incoming_connection(struct rxrpc_connection *, struct sk_buff *);
1006 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
1007
1008 /*
1009  * input.c
1010  */
1011 void rxrpc_data_ready(struct sock *);
1012
1013 /*
1014  * insecure.c
1015  */
1016 extern const struct rxrpc_security rxrpc_no_security;
1017
1018 /*
1019  * key.c
1020  */
1021 extern struct key_type key_type_rxrpc;
1022 extern struct key_type key_type_rxrpc_s;
1023
1024 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
1025 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
1026 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time_t,
1027                               u32);
1028
1029 /*
1030  * local_event.c
1031  */
1032 extern void rxrpc_process_local_events(struct rxrpc_local *);
1033
1034 /*
1035  * local_object.c
1036  */
1037 struct rxrpc_local *rxrpc_lookup_local(const struct sockaddr_rxrpc *);
1038 void __rxrpc_put_local(struct rxrpc_local *);
1039 void __exit rxrpc_destroy_all_locals(void);
1040
1041 static inline void rxrpc_get_local(struct rxrpc_local *local)
1042 {
1043         atomic_inc(&local->usage);
1044 }
1045
1046 static inline
1047 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *local)
1048 {
1049         return atomic_inc_not_zero(&local->usage) ? local : NULL;
1050 }
1051
1052 static inline void rxrpc_put_local(struct rxrpc_local *local)
1053 {
1054         if (local && atomic_dec_and_test(&local->usage))
1055                 __rxrpc_put_local(local);
1056 }
1057
1058 static inline void rxrpc_queue_local(struct rxrpc_local *local)
1059 {
1060         rxrpc_queue_work(&local->processor);
1061 }
1062
1063 /*
1064  * misc.c
1065  */
1066 extern unsigned int rxrpc_max_backlog __read_mostly;
1067 extern unsigned int rxrpc_requested_ack_delay;
1068 extern unsigned int rxrpc_soft_ack_delay;
1069 extern unsigned int rxrpc_idle_ack_delay;
1070 extern unsigned int rxrpc_rx_window_size;
1071 extern unsigned int rxrpc_rx_mtu;
1072 extern unsigned int rxrpc_rx_jumbo_max;
1073 extern unsigned int rxrpc_resend_timeout;
1074
1075 extern const s8 rxrpc_ack_priority[];
1076
1077 /*
1078  * output.c
1079  */
1080 int rxrpc_send_ack_packet(struct rxrpc_call *, bool);
1081 int rxrpc_send_abort_packet(struct rxrpc_call *);
1082 int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
1083 void rxrpc_reject_packets(struct rxrpc_local *);
1084
1085 /*
1086  * peer_event.c
1087  */
1088 void rxrpc_error_report(struct sock *);
1089 void rxrpc_peer_error_distributor(struct work_struct *);
1090 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace,
1091                         rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
1092
1093 /*
1094  * peer_object.c
1095  */
1096 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
1097                                          const struct sockaddr_rxrpc *);
1098 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *,
1099                                      struct sockaddr_rxrpc *, gfp_t);
1100 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
1101 struct rxrpc_peer *rxrpc_lookup_incoming_peer(struct rxrpc_local *,
1102                                               struct rxrpc_peer *);
1103
1104 static inline struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *peer)
1105 {
1106         atomic_inc(&peer->usage);
1107         return peer;
1108 }
1109
1110 static inline
1111 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *peer)
1112 {
1113         return atomic_inc_not_zero(&peer->usage) ? peer : NULL;
1114 }
1115
1116 extern void __rxrpc_put_peer(struct rxrpc_peer *peer);
1117 static inline void rxrpc_put_peer(struct rxrpc_peer *peer)
1118 {
1119         if (peer && atomic_dec_and_test(&peer->usage))
1120                 __rxrpc_put_peer(peer);
1121 }
1122
1123 /*
1124  * proc.c
1125  */
1126 extern const struct file_operations rxrpc_call_seq_fops;
1127 extern const struct file_operations rxrpc_connection_seq_fops;
1128
1129 /*
1130  * recvmsg.c
1131  */
1132 void rxrpc_notify_socket(struct rxrpc_call *);
1133 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1134
1135 /*
1136  * rxkad.c
1137  */
1138 #ifdef CONFIG_RXKAD
1139 extern const struct rxrpc_security rxkad;
1140 #endif
1141
1142 /*
1143  * security.c
1144  */
1145 int __init rxrpc_init_security(void);
1146 void rxrpc_exit_security(void);
1147 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1148 int rxrpc_init_server_conn_security(struct rxrpc_connection *);
1149
1150 /*
1151  * sendmsg.c
1152  */
1153 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1154
1155 /*
1156  * skbuff.c
1157  */
1158 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1159 void rxrpc_packet_destructor(struct sk_buff *);
1160 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1161 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1162 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1163 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1164 void rxrpc_lose_skb(struct sk_buff *, enum rxrpc_skb_trace);
1165 void rxrpc_purge_queue(struct sk_buff_head *);
1166
1167 /*
1168  * sysctl.c
1169  */
1170 #ifdef CONFIG_SYSCTL
1171 extern int __init rxrpc_sysctl_init(void);
1172 extern void rxrpc_sysctl_exit(void);
1173 #else
1174 static inline int __init rxrpc_sysctl_init(void) { return 0; }
1175 static inline void rxrpc_sysctl_exit(void) {}
1176 #endif
1177
1178 /*
1179  * utils.c
1180  */
1181 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1182
1183 static inline bool before(u32 seq1, u32 seq2)
1184 {
1185         return (s32)(seq1 - seq2) < 0;
1186 }
1187 static inline bool before_eq(u32 seq1, u32 seq2)
1188 {
1189         return (s32)(seq1 - seq2) <= 0;
1190 }
1191 static inline bool after(u32 seq1, u32 seq2)
1192 {
1193         return (s32)(seq1 - seq2) > 0;
1194 }
1195 static inline bool after_eq(u32 seq1, u32 seq2)
1196 {
1197         return (s32)(seq1 - seq2) >= 0;
1198 }
1199
1200 /*
1201  * debug tracing
1202  */
1203 extern unsigned int rxrpc_debug;
1204
1205 #define dbgprintk(FMT,...) \
1206         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1207
1208 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1209 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1210 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
1211 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
1212 #define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)
1213
1214
1215 #if defined(__KDEBUG)
1216 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1217 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1218 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1219 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
1220 #define _net(FMT,...)   knet(FMT,##__VA_ARGS__)
1221
1222 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1223 #define RXRPC_DEBUG_KENTER      0x01
1224 #define RXRPC_DEBUG_KLEAVE      0x02
1225 #define RXRPC_DEBUG_KDEBUG      0x04
1226 #define RXRPC_DEBUG_KPROTO      0x08
1227 #define RXRPC_DEBUG_KNET        0x10
1228
1229 #define _enter(FMT,...)                                 \
1230 do {                                                    \
1231         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
1232                 kenter(FMT,##__VA_ARGS__);              \
1233 } while (0)
1234
1235 #define _leave(FMT,...)                                 \
1236 do {                                                    \
1237         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
1238                 kleave(FMT,##__VA_ARGS__);              \
1239 } while (0)
1240
1241 #define _debug(FMT,...)                                 \
1242 do {                                                    \
1243         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
1244                 kdebug(FMT,##__VA_ARGS__);              \
1245 } while (0)
1246
1247 #define _proto(FMT,...)                                 \
1248 do {                                                    \
1249         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
1250                 kproto(FMT,##__VA_ARGS__);              \
1251 } while (0)
1252
1253 #define _net(FMT,...)                                   \
1254 do {                                                    \
1255         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))   \
1256                 knet(FMT,##__VA_ARGS__);                \
1257 } while (0)
1258
1259 #else
1260 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1261 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1262 #define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
1263 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
1264 #define _net(FMT,...)   no_printk("@@@ "FMT ,##__VA_ARGS__)
1265 #endif
1266
1267 /*
1268  * debug assertion checking
1269  */
1270 #if 1 // defined(__KDEBUGALL)
1271
1272 #define ASSERT(X)                                               \
1273 do {                                                            \
1274         if (unlikely(!(X))) {                                   \
1275                 pr_err("Assertion failed\n");                   \
1276                 BUG();                                          \
1277         }                                                       \
1278 } while (0)
1279
1280 #define ASSERTCMP(X, OP, Y)                                             \
1281 do {                                                                    \
1282         __typeof__(X) _x = (X);                                         \
1283         __typeof__(Y) _y = (__typeof__(X))(Y);                          \
1284         if (unlikely(!(_x OP _y))) {                                    \
1285                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1286                        (unsigned long)_x, (unsigned long)_x, #OP,       \
1287                        (unsigned long)_y, (unsigned long)_y);           \
1288                 BUG();                                                  \
1289         }                                                               \
1290 } while (0)
1291
1292 #define ASSERTIF(C, X)                                          \
1293 do {                                                            \
1294         if (unlikely((C) && !(X))) {                            \
1295                 pr_err("Assertion failed\n");                   \
1296                 BUG();                                          \
1297         }                                                       \
1298 } while (0)
1299
1300 #define ASSERTIFCMP(C, X, OP, Y)                                        \
1301 do {                                                                    \
1302         __typeof__(X) _x = (X);                                         \
1303         __typeof__(Y) _y = (__typeof__(X))(Y);                          \
1304         if (unlikely((C) && !(_x OP _y))) {                             \
1305                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1306                        (unsigned long)_x, (unsigned long)_x, #OP,       \
1307                        (unsigned long)_y, (unsigned long)_y);           \
1308                 BUG();                                                  \
1309         }                                                               \
1310 } while (0)
1311
1312 #else
1313
1314 #define ASSERT(X)                               \
1315 do {                                            \
1316 } while (0)
1317
1318 #define ASSERTCMP(X, OP, Y)                     \
1319 do {                                            \
1320 } while (0)
1321
1322 #define ASSERTIF(C, X)                          \
1323 do {                                            \
1324 } while (0)
1325
1326 #define ASSERTIFCMP(C, X, OP, Y)                \
1327 do {                                            \
1328 } while (0)
1329
1330 #endif /* __KDEBUGALL */