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/* 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;
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