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ar-internal.h

/* AF_RXRPC internal definitions
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <rxrpc/packet.h>

#if 0
#define CHECK_SLAB_OKAY(X)                           \
      BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
             (POISON_FREE << 8 | POISON_FREE))
#else
#define CHECK_SLAB_OKAY(X) do {} while(0)
#endif

#define FCRYPT_BSIZE 8
struct rxrpc_crypt {
      union {
            u8    x[FCRYPT_BSIZE];
            u32   n[2];
      };
} __attribute__((aligned(8)));

#define rxrpc_queue_work(WS)  queue_work(rxrpc_workqueue, (WS))
#define rxrpc_queue_delayed_work(WS,D)    \
      queue_delayed_work(rxrpc_workqueue, (WS), (D))

#define rxrpc_queue_call(CALL)      rxrpc_queue_work(&(CALL)->processor)
#define rxrpc_queue_conn(CONN)      rxrpc_queue_work(&(CONN)->processor)

/*
 * sk_state for RxRPC sockets
 */
enum {
      RXRPC_UNCONNECTED = 0,
      RXRPC_CLIENT_BOUND,           /* client local address bound */
      RXRPC_CLIENT_CONNECTED,       /* client is connected */
      RXRPC_SERVER_BOUND,           /* server local address bound */
      RXRPC_SERVER_LISTENING,       /* server listening for connections */
      RXRPC_CLOSE,                  /* socket is being closed */
};

/*
 * RxRPC socket definition
 */
struct rxrpc_sock {
      /* WARNING: sk has to be the first member */
      struct sock       sk;
      rxrpc_interceptor_t     interceptor;      /* kernel service Rx interceptor function */
      struct rxrpc_local      *local;           /* local endpoint */
      struct rxrpc_transport  *trans;           /* transport handler */
      struct rxrpc_conn_bundle *bundle;   /* virtual connection bundle */
      struct rxrpc_connection *conn;            /* exclusive virtual connection */
      struct list_head  listen_link;      /* link in the local endpoint's listen list */
      struct list_head  secureq;    /* calls awaiting connection security clearance */
      struct list_head  acceptq;    /* calls awaiting acceptance */
      struct key        *key;       /* security for this socket */
      struct key        *securities;      /* list of server security descriptors */
      struct rb_root          calls;            /* outstanding calls on this socket */
      unsigned long           flags;
#define RXRPC_SOCK_EXCLUSIVE_CONN   1     /* exclusive connection for a client socket */
      rwlock_t          call_lock;  /* lock for calls */
      u32               min_sec_level;    /* minimum security level */
#define RXRPC_SECURITY_MAX    RXRPC_SECURITY_ENCRYPT
      struct sockaddr_rxrpc   srx;        /* local address */
      sa_family_t       proto;            /* protocol created with */
      __be16                  service_id; /* service ID of local/remote service */
};

#define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)

/*
 * RxRPC socket buffer private variables
 * - max 48 bytes (struct sk_buff::cb)
 */
struct rxrpc_skb_priv {
      struct rxrpc_call *call;            /* call with which associated */
      unsigned long           resend_at;  /* time in jiffies at which to resend */
      union {
            unsigned    offset;           /* offset into buffer of next read */
            int         remain;           /* amount of space remaining for next write */
            u32         error;            /* network error code */
            bool        need_resend;      /* T if needs resending */
      };

      struct rxrpc_header     hdr;        /* RxRPC packet header from this packet */
};

#define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)

enum rxrpc_command {
      RXRPC_CMD_SEND_DATA,          /* send data message */
      RXRPC_CMD_SEND_ABORT,         /* request abort generation */
      RXRPC_CMD_ACCEPT,       /* [server] accept incoming call */
      RXRPC_CMD_REJECT_BUSY,        /* [server] reject a call as busy */
};

/*
 * RxRPC security module interface
 */
struct rxrpc_security {
      struct module           *owner;           /* providing module */
      struct list_head  link;       /* link in master list */
      const char        *name;            /* name of this service */
      u8                security_index;   /* security type provided */

      /* initialise a connection's security */
      int (*init_connection_security)(struct rxrpc_connection *);

      /* prime a connection's packet security */
      void (*prime_packet_security)(struct rxrpc_connection *);

      /* impose security on a packet */
      int (*secure_packet)(const struct rxrpc_call *,
                       struct sk_buff *,
                       size_t,
                       void *);

      /* verify the security on a received packet */
      int (*verify_packet)(const struct rxrpc_call *, struct sk_buff *,
                       u32 *);

      /* issue a challenge */
      int (*issue_challenge)(struct rxrpc_connection *);

      /* respond to a challenge */
      int (*respond_to_challenge)(struct rxrpc_connection *,
                            struct sk_buff *,
                            u32 *);

      /* verify a response */
      int (*verify_response)(struct rxrpc_connection *,
                         struct sk_buff *,
                         u32 *);

      /* clear connection security */
      void (*clear)(struct rxrpc_connection *);
};

/*
 * RxRPC local transport endpoint definition
 * - matched by local port, address and protocol type
 */
struct rxrpc_local {
      struct socket           *socket;    /* my UDP socket */
      struct work_struct      destroyer;  /* endpoint destroyer */
      struct work_struct      acceptor;   /* incoming call processor */
      struct work_struct      rejecter;   /* packet reject writer */
      struct list_head  services;   /* services listening on this endpoint */
      struct list_head  link;       /* link in endpoint list */
      struct rw_semaphore     defrag_sem; /* control re-enablement of IP DF bit */
      struct sk_buff_head     accept_queue;     /* incoming calls awaiting acceptance */
      struct sk_buff_head     reject_queue;     /* packets awaiting rejection */
      spinlock_t        lock;       /* access lock */
      rwlock_t          services_lock;    /* lock for services list */
      atomic_t          usage;
      int               debug_id;   /* debug ID for printks */
      volatile char           error_rcvd; /* T if received ICMP error outstanding */
      struct sockaddr_rxrpc   srx;        /* local address */
};

/*
 * RxRPC remote transport endpoint definition
 * - matched by remote port, address and protocol type
 * - holds the connection ID counter for connections between the two endpoints
 */
struct rxrpc_peer {
      struct work_struct      destroyer;  /* peer destroyer */
      struct list_head  link;       /* link in master peer list */
      struct list_head  error_targets;    /* targets for net error distribution */
      spinlock_t        lock;       /* access lock */
      atomic_t          usage;
      unsigned          if_mtu;           /* interface MTU for this peer */
      unsigned          mtu;        /* network MTU for this peer */
      unsigned          maxdata;    /* data size (MTU - hdrsize) */
      unsigned short          hdrsize;    /* header size (IP + UDP + RxRPC) */
      int               debug_id;   /* debug ID for printks */
      int               net_error;  /* network error distributed */
      struct sockaddr_rxrpc   srx;        /* remote address */

      /* calculated RTT cache */
#define RXRPC_RTT_CACHE_SIZE 32
      suseconds_t       rtt;        /* current RTT estimate (in uS) */
      unsigned          rtt_point;  /* next entry at which to insert */
      unsigned          rtt_usage;  /* amount of cache actually used */
      suseconds_t       rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* calculated RTT cache */
};

/*
 * RxRPC point-to-point transport / connection manager definition
 * - handles a bundle of connections between two endpoints
 * - matched by { local, peer }
 */
struct rxrpc_transport {
      struct rxrpc_local      *local;           /* local transport endpoint */
      struct rxrpc_peer *peer;            /* remote transport endpoint */
      struct work_struct      error_handler;    /* network error distributor */
      struct rb_root          bundles;    /* client connection bundles on this transport */
      struct rb_root          client_conns;     /* client connections on this transport */
      struct rb_root          server_conns;     /* server connections on this transport */
      struct list_head  link;       /* link in master session list */
      struct sk_buff_head     error_queue;      /* error packets awaiting processing */
      time_t                  put_time;   /* time at which to reap */
      spinlock_t        client_lock;      /* client connection allocation lock */
      rwlock_t          conn_lock;  /* lock for active/dead connections */
      atomic_t          usage;
      int               debug_id;   /* debug ID for printks */
      unsigned int            conn_idcounter;   /* connection ID counter (client) */
};

/*
 * RxRPC client connection bundle
 * - matched by { transport, service_id, key }
 */
struct rxrpc_conn_bundle {
      struct rb_node          node;       /* node in transport's lookup tree */
      struct list_head  unused_conns;     /* unused connections in this bundle */
      struct list_head  avail_conns;      /* available connections in this bundle */
      struct list_head  busy_conns; /* busy connections in this bundle */
      struct key        *key;       /* security for this bundle */
      wait_queue_head_t chanwait;   /* wait for channel to become available */
      atomic_t          usage;
      int               debug_id;   /* debug ID for printks */
      unsigned short          num_conns;  /* number of connections in this bundle */
      __be16                  service_id; /* service ID */
      uint8_t                 security_ix;      /* security type */
};

/*
 * RxRPC connection definition
 * - matched by { transport, service_id, conn_id, direction, key }
 * - each connection can only handle four simultaneous calls
 */
struct rxrpc_connection {
      struct rxrpc_transport  *trans;           /* transport session */
      struct rxrpc_conn_bundle *bundle;   /* connection bundle (client) */
      struct work_struct      processor;  /* connection event processor */
      struct rb_node          node;       /* node in transport's lookup tree */
      struct list_head  link;       /* link in master connection list */
      struct list_head  bundle_link;      /* link in bundle */
      struct rb_root          calls;            /* calls on this connection */
      struct sk_buff_head     rx_queue;   /* received conn-level packets */
      struct rxrpc_call *channels[RXRPC_MAXCALLS]; /* channels (active calls) */
      struct rxrpc_security   *security;  /* applied security module */
      struct key        *key;       /* security for this connection (client) */
      struct key        *server_key;      /* security for this service */
      struct crypto_blkcipher *cipher;    /* encryption handle */
      struct rxrpc_crypt      csum_iv;    /* packet checksum base */
      unsigned long           events;
#define RXRPC_CONN_CHALLENGE  0           /* send challenge packet */
      time_t                  put_time;   /* time at which to reap */
      rwlock_t          lock;       /* access lock */
      spinlock_t        state_lock; /* state-change lock */
      atomic_t          usage;
      u32               real_conn_id;     /* connection ID (host-endian) */
      enum {                              /* current state of connection */
            RXRPC_CONN_UNUSED,            /* - connection not yet attempted */
            RXRPC_CONN_CLIENT,            /* - client connection */
            RXRPC_CONN_SERVER_UNSECURED,  /* - server unsecured connection */
            RXRPC_CONN_SERVER_CHALLENGING,      /* - server challenging for security */
            RXRPC_CONN_SERVER,            /* - server secured connection */
            RXRPC_CONN_REMOTELY_ABORTED,  /* - conn aborted by peer */
            RXRPC_CONN_LOCALLY_ABORTED,   /* - conn aborted locally */
            RXRPC_CONN_NETWORK_ERROR,     /* - conn terminated by network error */
      } state;
      int               error;            /* error code for local abort */
      int               debug_id;   /* debug ID for printks */
      unsigned          call_counter;     /* call ID counter */
      atomic_t          serial;           /* packet serial number counter */
      atomic_t          hi_serial;  /* highest serial number received */
      u8                avail_calls;      /* number of calls available */
      u8                size_align; /* data size alignment (for security) */
      u8                header_size;      /* rxrpc + security header size */
      u8                security_size;    /* security header size */
      u32               security_level;   /* security level negotiated */
      u32               security_nonce;   /* response re-use preventer */

      /* the following are all in net order */
      __be32                  epoch;            /* epoch of this connection */
      __be32                  cid;        /* connection ID */
      __be16                  service_id; /* service ID */
      u8                security_ix;      /* security type */
      u8                in_clientflag;    /* RXRPC_CLIENT_INITIATED if we are server */
      u8                out_clientflag;   /* RXRPC_CLIENT_INITIATED if we are client */
};

/*
 * RxRPC call definition
 * - matched by { connection, call_id }
 */
struct rxrpc_call {
      struct rxrpc_connection *conn;            /* connection carrying call */
      struct rxrpc_sock *socket;    /* socket responsible */
      struct timer_list lifetimer;  /* lifetime remaining on call */
      struct timer_list deadspan;   /* reap timer for re-ACK'ing, etc  */
      struct timer_list ack_timer;  /* ACK generation timer */
      struct timer_list resend_timer;     /* Tx resend timer */
      struct work_struct      destroyer;  /* call destroyer */
      struct work_struct      processor;  /* packet processor and ACK generator */
      struct list_head  link;       /* link in master call list */
      struct list_head  error_link; /* link in error distribution list */
      struct list_head  accept_link;      /* calls awaiting acceptance */
      struct rb_node          sock_node;  /* node in socket call tree */
      struct rb_node          conn_node;  /* node in connection call tree */
      struct sk_buff_head     rx_queue;   /* received packets */
      struct sk_buff_head     rx_oos_queue;     /* packets received out of sequence */
      struct sk_buff          *tx_pending;      /* Tx socket buffer being filled */
      wait_queue_head_t tx_waitq;   /* wait for Tx window space to become available */
      unsigned long           user_call_ID;     /* user-defined call ID */
      unsigned long           creation_jif;     /* time of call creation */
      unsigned long           flags;
#define RXRPC_CALL_RELEASED   0     /* call has been released - no more message to userspace */
#define RXRPC_CALL_TERMINAL_MSG     1     /* call has given the socket its final message */
#define RXRPC_CALL_RCVD_LAST  2     /* all packets received */
#define RXRPC_CALL_RUN_RTIMER 3     /* Tx resend timer started */
#define RXRPC_CALL_TX_SOFT_ACK      4     /* sent some soft ACKs */
#define RXRPC_CALL_PROC_BUSY  5     /* the processor is busy */
#define RXRPC_CALL_INIT_ACCEPT      6     /* acceptance was initiated */
#define RXRPC_CALL_HAS_USERID 7     /* has a user ID attached */
#define RXRPC_CALL_EXPECT_OOS 8     /* expect out of sequence packets */
      unsigned long           events;
#define RXRPC_CALL_RCVD_ACKALL      0     /* ACKALL or reply received */
#define RXRPC_CALL_RCVD_BUSY  1     /* busy packet received */
#define RXRPC_CALL_RCVD_ABORT 2     /* abort packet received */
#define RXRPC_CALL_RCVD_ERROR 3     /* network error received */
#define RXRPC_CALL_ACK_FINAL  4     /* need to generate final ACK (and release call) */
#define RXRPC_CALL_ACK        5     /* need to generate ACK */
#define RXRPC_CALL_REJECT_BUSY      6     /* need to generate busy message */
#define RXRPC_CALL_ABORT      7     /* need to generate abort */
#define RXRPC_CALL_CONN_ABORT 8     /* local connection abort generated */
#define RXRPC_CALL_RESEND_TIMER     9     /* Tx resend timer expired */
#define RXRPC_CALL_RESEND     10    /* Tx resend required */
#define RXRPC_CALL_DRAIN_RX_OOS     11    /* drain the Rx out of sequence queue */
#define RXRPC_CALL_LIFE_TIMER 12    /* call's lifetimer ran out */
#define RXRPC_CALL_ACCEPTED   13    /* incoming call accepted by userspace app */
#define RXRPC_CALL_SECURED    14    /* incoming call's connection is now secure */
#define RXRPC_CALL_POST_ACCEPT      15    /* need to post an "accept?" message to the app */
#define RXRPC_CALL_RELEASE    16    /* need to release the call's resources */

      spinlock_t        lock;
      rwlock_t          state_lock; /* lock for state transition */
      atomic_t          usage;
      atomic_t          sequence;   /* Tx data packet sequence counter */
      u32               abort_code; /* local/remote abort code */
      enum {                              /* current state of call */
            RXRPC_CALL_CLIENT_SEND_REQUEST,     /* - client sending request phase */
            RXRPC_CALL_CLIENT_AWAIT_REPLY,      /* - client awaiting reply */
            RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */
            RXRPC_CALL_CLIENT_FINAL_ACK,  /* - client sending final ACK phase */
            RXRPC_CALL_SERVER_SECURING,   /* - server securing request connection */
            RXRPC_CALL_SERVER_ACCEPTING,  /* - server accepting request */
            RXRPC_CALL_SERVER_RECV_REQUEST,     /* - server receiving request */
            RXRPC_CALL_SERVER_ACK_REQUEST,      /* - server pending ACK of request */
            RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */
            RXRPC_CALL_SERVER_AWAIT_ACK,  /* - server awaiting final ACK */
            RXRPC_CALL_COMPLETE,          /* - call completed */
            RXRPC_CALL_SERVER_BUSY,       /* - call rejected by busy server */
            RXRPC_CALL_REMOTELY_ABORTED,  /* - call aborted by peer */
            RXRPC_CALL_LOCALLY_ABORTED,   /* - call aborted locally on error or close */
            RXRPC_CALL_NETWORK_ERROR,     /* - call terminated by network error */
            RXRPC_CALL_DEAD,        /* - call is dead */
      } state;
      int               debug_id;   /* debug ID for printks */
      u8                channel;    /* connection channel occupied by this call */

      /* transmission-phase ACK management */
      uint8_t                 acks_head;  /* offset into window of first entry */
      uint8_t                 acks_tail;  /* offset into window of last entry */
      uint8_t                 acks_winsz; /* size of un-ACK'd window */
      uint8_t                 acks_unacked;     /* lowest unacked packet in last ACK received */
      int               acks_latest;      /* serial number of latest ACK received */
      rxrpc_seq_t       acks_hard;  /* highest definitively ACK'd msg seq */
      unsigned long           *acks_window;     /* sent packet window
                                     * - elements are pointers with LSB set if ACK'd
                                     */

      /* receive-phase ACK management */
      rxrpc_seq_t       rx_data_expect;   /* next data seq ID expected to be received */
      rxrpc_seq_t       rx_data_post;     /* next data seq ID expected to be posted */
      rxrpc_seq_t       rx_data_recv;     /* last data seq ID encountered by recvmsg */
      rxrpc_seq_t       rx_data_eaten;    /* last data seq ID consumed by recvmsg */
      rxrpc_seq_t       rx_first_oos;     /* first packet in rx_oos_queue (or 0) */
      rxrpc_seq_t       ackr_win_top;     /* top of ACK window (rx_data_eaten is bottom) */
      rxrpc_seq_net_t         ackr_prev_seq;    /* previous sequence number received */
      uint8_t                 ackr_reason;      /* reason to ACK */
      __be32                  ackr_serial;      /* serial of packet being ACK'd */
      atomic_t          ackr_not_idle;    /* number of packets in Rx queue */

      /* received packet records, 1 bit per record */
#define RXRPC_ACKR_WINDOW_ASZ DIV_ROUND_UP(RXRPC_MAXACKS, BITS_PER_LONG)
      unsigned long           ackr_window[RXRPC_ACKR_WINDOW_ASZ + 1];

      /* the following should all be in net order */
      __be32                  cid;        /* connection ID + channel index  */
      __be32                  call_id;    /* call ID on connection  */
};

/*
 * RxRPC key for Kerberos (type-2 security)
 */
struct rxkad_key {
      u16   security_index;         /* RxRPC header security index */
      u16   ticket_len;       /* length of ticket[] */
      u32   expiry;                 /* time at which expires */
      u32   kvno;             /* key version number */
      u8    session_key[8];         /* DES session key */
      u8    ticket[0];        /* the encrypted ticket */
};

struct rxrpc_key_payload {
      struct rxkad_key k;
};

/*
 * locally abort an RxRPC call
 */
static inline void rxrpc_abort_call(struct rxrpc_call *call, u32 abort_code)
{
      write_lock_bh(&call->state_lock);
      if (call->state < RXRPC_CALL_COMPLETE) {
            call->abort_code = abort_code;
            call->state = RXRPC_CALL_LOCALLY_ABORTED;
            set_bit(RXRPC_CALL_ABORT, &call->events);
      }
      write_unlock_bh(&call->state_lock);
}

/*
 * af_rxrpc.c
 */
extern atomic_t rxrpc_n_skbs;
extern __be32 rxrpc_epoch;
extern atomic_t rxrpc_debug_id;
extern struct workqueue_struct *rxrpc_workqueue;

/*
 * ar-accept.c
 */
extern void rxrpc_accept_incoming_calls(struct work_struct *);
extern struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *,
                                  unsigned long);
extern int rxrpc_reject_call(struct rxrpc_sock *);

/*
 * ar-ack.c
 */
extern void __rxrpc_propose_ACK(struct rxrpc_call *, uint8_t, __be32, bool);
extern void rxrpc_propose_ACK(struct rxrpc_call *, uint8_t, __be32, bool);
extern void rxrpc_process_call(struct work_struct *);

/*
 * ar-call.c
 */
extern struct kmem_cache *rxrpc_call_jar;
extern struct list_head rxrpc_calls;
extern rwlock_t rxrpc_call_lock;

extern struct rxrpc_call *rxrpc_get_client_call(struct rxrpc_sock *,
                                    struct rxrpc_transport *,
                                    struct rxrpc_conn_bundle *,
                                    unsigned long, int, gfp_t);
extern struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *,
                                    struct rxrpc_connection *,
                                    struct rxrpc_header *, gfp_t);
extern struct rxrpc_call *rxrpc_find_server_call(struct rxrpc_sock *,
                                     unsigned long);
extern void rxrpc_release_call(struct rxrpc_call *);
extern void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
extern void __rxrpc_put_call(struct rxrpc_call *);
extern void __exit rxrpc_destroy_all_calls(void);

/*
 * ar-connection.c
 */
extern struct list_head rxrpc_connections;
extern rwlock_t rxrpc_connection_lock;

extern struct rxrpc_conn_bundle *rxrpc_get_bundle(struct rxrpc_sock *,
                                      struct rxrpc_transport *,
                                      struct key *,
                                      __be16, gfp_t);
extern void rxrpc_put_bundle(struct rxrpc_transport *,
                       struct rxrpc_conn_bundle *);
extern int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_transport *,
                        struct rxrpc_conn_bundle *, struct rxrpc_call *,
                        gfp_t);
extern void rxrpc_put_connection(struct rxrpc_connection *);
extern void __exit rxrpc_destroy_all_connections(void);
extern struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *,
                                          struct rxrpc_header *);
extern struct rxrpc_connection *
rxrpc_incoming_connection(struct rxrpc_transport *, struct rxrpc_header *,
                    gfp_t);

/*
 * ar-connevent.c
 */
extern void rxrpc_process_connection(struct work_struct *);
extern void rxrpc_reject_packet(struct rxrpc_local *, struct sk_buff *);
extern void rxrpc_reject_packets(struct work_struct *);

/*
 * ar-error.c
 */
extern void rxrpc_UDP_error_report(struct sock *);
extern void rxrpc_UDP_error_handler(struct work_struct *);

/*
 * ar-input.c
 */
extern unsigned long rxrpc_ack_timeout;
extern const char *rxrpc_pkts[];

extern void rxrpc_data_ready(struct sock *, int);
extern int rxrpc_queue_rcv_skb(struct rxrpc_call *, struct sk_buff *, bool,
                         bool);
extern void rxrpc_fast_process_packet(struct rxrpc_call *, struct sk_buff *);

/*
 * ar-local.c
 */
extern rwlock_t rxrpc_local_lock;
extern struct rxrpc_local *rxrpc_lookup_local(struct sockaddr_rxrpc *);
extern void rxrpc_put_local(struct rxrpc_local *);
extern void __exit rxrpc_destroy_all_locals(void);

/*
 * ar-key.c
 */
extern struct key_type key_type_rxrpc;
extern struct key_type key_type_rxrpc_s;

extern int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
extern int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
extern int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *,
                             time_t, u32);

/*
 * ar-output.c
 */
extern int rxrpc_resend_timeout;

extern int rxrpc_send_packet(struct rxrpc_transport *, struct sk_buff *);
extern int rxrpc_client_sendmsg(struct kiocb *, struct rxrpc_sock *,
                        struct rxrpc_transport *, struct msghdr *,
                        size_t);
extern int rxrpc_server_sendmsg(struct kiocb *, struct rxrpc_sock *,
                        struct msghdr *, size_t);

/*
 * ar-peer.c
 */
extern struct rxrpc_peer *rxrpc_get_peer(struct sockaddr_rxrpc *, gfp_t);
extern void rxrpc_put_peer(struct rxrpc_peer *);
extern struct rxrpc_peer *rxrpc_find_peer(struct rxrpc_local *,
                                __be32, __be16);
extern void __exit rxrpc_destroy_all_peers(void);

/*
 * ar-proc.c
 */
extern const char *rxrpc_call_states[];
extern struct file_operations rxrpc_call_seq_fops;
extern struct file_operations rxrpc_connection_seq_fops;

/*
 * ar-recvmsg.c
 */
extern void rxrpc_remove_user_ID(struct rxrpc_sock *, struct rxrpc_call *);
extern int rxrpc_recvmsg(struct kiocb *, struct socket *, struct msghdr *,
                   size_t, int);

/*
 * ar-security.c
 */
extern int rxrpc_register_security(struct rxrpc_security *);
extern void rxrpc_unregister_security(struct rxrpc_security *);
extern int rxrpc_init_client_conn_security(struct rxrpc_connection *);
extern int rxrpc_init_server_conn_security(struct rxrpc_connection *);
extern int rxrpc_secure_packet(const struct rxrpc_call *, struct sk_buff *,
                         size_t, void *);
extern int rxrpc_verify_packet(const struct rxrpc_call *, struct sk_buff *,
                         u32 *);
extern void rxrpc_clear_conn_security(struct rxrpc_connection *);

/*
 * ar-skbuff.c
 */
extern void rxrpc_packet_destructor(struct sk_buff *);

/*
 * ar-transport.c
 */
extern struct rxrpc_transport *rxrpc_get_transport(struct rxrpc_local *,
                                       struct rxrpc_peer *,
                                       gfp_t);
extern void rxrpc_put_transport(struct rxrpc_transport *);
extern void __exit rxrpc_destroy_all_transports(void);
extern struct rxrpc_transport *rxrpc_find_transport(struct rxrpc_local *,
                                        struct rxrpc_peer *);

/*
 * debug tracing
 */
extern unsigned rxrpc_debug;

#define dbgprintk(FMT,...) \
      printk("[%x%-6.6s] "FMT"\n", smp_processor_id(), current->comm ,##__VA_ARGS__)

/* make sure we maintain the format strings, even when debugging is disabled */
static inline __attribute__((format(printf,1,2)))
void _dbprintk(const char *fmt, ...)
{
}

#define kenter(FMT,...) dbgprintk("==> %s("FMT")",__FUNCTION__ ,##__VA_ARGS__)
#define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__FUNCTION__ ,##__VA_ARGS__)
#define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
#define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
#define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)


#if defined(__KDEBUG)
#define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
#define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
#define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
#define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
#define _net(FMT,...)   knet(FMT,##__VA_ARGS__)

#elif defined(CONFIG_AF_RXRPC_DEBUG)
#define RXRPC_DEBUG_KENTER    0x01
#define RXRPC_DEBUG_KLEAVE    0x02
#define RXRPC_DEBUG_KDEBUG    0x04
#define RXRPC_DEBUG_KPROTO    0x08
#define RXRPC_DEBUG_KNET      0x10

#define _enter(FMT,...)                         \
do {                                      \
      if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
            kenter(FMT,##__VA_ARGS__);          \
} while (0)

#define _leave(FMT,...)                         \
do {                                      \
      if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
            kleave(FMT,##__VA_ARGS__);          \
} while (0)

#define _debug(FMT,...)                         \
do {                                      \
      if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
            kdebug(FMT,##__VA_ARGS__);          \
} while (0)

#define _proto(FMT,...)                         \
do {                                      \
      if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
            kproto(FMT,##__VA_ARGS__);          \
} while (0)

#define _net(FMT,...)                           \
do {                                      \
      if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))   \
            knet(FMT,##__VA_ARGS__);            \
} while (0)

#else
#define _enter(FMT,...) _dbprintk("==> %s("FMT")",__FUNCTION__ ,##__VA_ARGS__)
#define _leave(FMT,...) _dbprintk("<== %s()"FMT"",__FUNCTION__ ,##__VA_ARGS__)
#define _debug(FMT,...) _dbprintk("    "FMT ,##__VA_ARGS__)
#define _proto(FMT,...) _dbprintk("### "FMT ,##__VA_ARGS__)
#define _net(FMT,...)   _dbprintk("@@@ "FMT ,##__VA_ARGS__)
#endif

/*
 * debug assertion checking
 */
#if 1 // defined(__KDEBUGALL)

#define ASSERT(X)                               \
do {                                            \
      if (unlikely(!(X))) {                           \
            printk(KERN_ERR "\n");                    \
            printk(KERN_ERR "RxRPC: Assertion failed\n");   \
            BUG();                                    \
      }                                         \
} while(0)

#define ASSERTCMP(X, OP, Y)                                 \
do {                                                  \
      if (unlikely(!((X) OP (Y)))) {                              \
            printk(KERN_ERR "\n");                          \
            printk(KERN_ERR "RxRPC: Assertion failed\n");         \
            printk(KERN_ERR "%lu " #OP " %lu is false\n",         \
                   (unsigned long)(X), (unsigned long)(Y));       \
            printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",     \
                   (unsigned long)(X), (unsigned long)(Y));       \
            BUG();                                          \
      }                                               \
} while(0)

#define ASSERTIF(C, X)                                \
do {                                            \
      if (unlikely((C) && !(X))) {                    \
            printk(KERN_ERR "\n");                    \
            printk(KERN_ERR "RxRPC: Assertion failed\n");   \
            BUG();                                    \
      }                                         \
} while(0)

#define ASSERTIFCMP(C, X, OP, Y)                            \
do {                                                  \
      if (unlikely((C) && !((X) OP (Y)))) {                       \
            printk(KERN_ERR "\n");                          \
            printk(KERN_ERR "RxRPC: Assertion failed\n");         \
            printk(KERN_ERR "%lu " #OP " %lu is false\n",         \
                   (unsigned long)(X), (unsigned long)(Y));       \
            printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",     \
                   (unsigned long)(X), (unsigned long)(Y));       \
            BUG();                                          \
      }                                               \
} while(0)

#else

#define ASSERT(X)                   \
do {                                \
} while(0)

#define ASSERTCMP(X, OP, Y)               \
do {                                \
} while(0)

#define ASSERTIF(C, X)                    \
do {                                \
} while(0)

#define ASSERTIFCMP(C, X, OP, Y)          \
do {                                \
} while(0)

#endif /* __KDEBUGALL */

/*
 * socket buffer accounting / leak finding
 */
static inline void __rxrpc_new_skb(struct sk_buff *skb, const char *fn)
{
      //_net("new skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
      //atomic_inc(&rxrpc_n_skbs);
}

#define rxrpc_new_skb(skb) __rxrpc_new_skb((skb), __func__)

static inline void __rxrpc_kill_skb(struct sk_buff *skb, const char *fn)
{
      //_net("kill skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
      //atomic_dec(&rxrpc_n_skbs);
}

#define rxrpc_kill_skb(skb) __rxrpc_kill_skb((skb), __func__)

static inline void __rxrpc_free_skb(struct sk_buff *skb, const char *fn)
{
      if (skb) {
            CHECK_SLAB_OKAY(&skb->users);
            //_net("free skb %p %s [%d]",
            //     skb, fn, atomic_read(&rxrpc_n_skbs));
            //atomic_dec(&rxrpc_n_skbs);
            kfree_skb(skb);
      }
}

#define rxrpc_free_skb(skb) __rxrpc_free_skb((skb), __func__)

static inline void rxrpc_purge_queue(struct sk_buff_head *list)
{
      struct sk_buff *skb;
      while ((skb = skb_dequeue((list))) != NULL)
            rxrpc_free_skb(skb);
}

static inline void __rxrpc_get_local(struct rxrpc_local *local, const char *f)
{
      CHECK_SLAB_OKAY(&local->usage);
      if (atomic_inc_return(&local->usage) == 1)
            printk("resurrected (%s)\n", f);
}

#define rxrpc_get_local(LOCAL) __rxrpc_get_local((LOCAL), __func__)

#define rxrpc_get_call(CALL)                    \
do {                                      \
      CHECK_SLAB_OKAY(&(CALL)->usage);          \
      if (atomic_inc_return(&(CALL)->usage) == 1)     \
            BUG();                              \
} while(0)

#define rxrpc_put_call(CALL)                    \
do {                                      \
      __rxrpc_put_call(CALL);                   \
} while(0)

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