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/*
Copyright (c) 2010 Gluster, Inc. <http://www.gluster.com>
This file is part of GlusterFS.
GlusterFS 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 3 of the License,
or (at your option) any later version.
GlusterFS is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see
<http://www.gnu.org/licenses/>.
*/
#ifndef __RPC_TRANSPORT_H__
#define __RPC_TRANSPORT_H__
#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif
#include <inttypes.h>
#include <rpc/rpc.h>
#include <rpc/auth.h>
#include <rpc/rpc_msg.h>
#ifndef MAX_IOVEC
#define MAX_IOVEC 16
#endif
/* Given the 4-byte fragment header, returns non-zero if this fragment
* is the last fragment for the RPC record being assemebled.
* RPC Record marking standard defines a 32 bit value as the fragment
* header with the MSB signifying whether the fragment is the last
* fragment for the record being asembled.
*/
#define RPC_LASTFRAG(fraghdr) ((uint32_t)(fraghdr & 0x80000000U))
/* Given the 4-byte fragment header, extracts the bits that contain
* the fragment size.
*/
#define RPC_FRAGSIZE(fraghdr) ((uint32_t)(fraghdr & 0x7fffffffU))
#define RPC_FRAGHDR_SIZE 4
#define RPC_MSGTYPE_SIZE 8
/* size of the msg from the start of call-body till and including credlen */
#define RPC_CALL_BODY_SIZE 24
#define RPC_REPLY_STATUS_SIZE 4
#define RPC_AUTH_FLAVOUR_N_LENGTH_SIZE 8
#define RPC_ACCEPT_STATUS_LEN 4
struct rpc_transport_ops;
typedef struct rpc_transport rpc_transport_t;
#include "dict.h"
#include "compat.h"
#include "rpcsvc-common.h"
struct peer_info {
struct sockaddr_storage sockaddr;
socklen_t sockaddr_len;
char identifier[UNIX_PATH_MAX];
};
typedef struct peer_info peer_info_t;
typedef enum msg_type msg_type_t;
typedef enum {
RPC_TRANSPORT_ACCEPT, /* New client has been accepted */
RPC_TRANSPORT_DISCONNECT, /* Connection is disconnected */
RPC_TRANSPORT_CLEANUP, /* connection is about to be freed */
/*RPC_TRANSPORT_READ,*/ /* An event used to enable rpcsvc to instruct
* transport the number of bytes to read.
* This helps in reading large msgs, wherein
* the rpc actors might decide to place the
* actor's payload in new iobufs separate
* from the rpc header, proghdr and
* authentication information. glusterfs/nfs
* read and write actors are few examples
* that might beniefit from this. While
* reading a single msg, this event may be
* delivered more than once.
*/
RPC_TRANSPORT_MAP_XID_REQUEST, /* reciever of this event should send
* the prognum and procnum corresponding
* to xid.
*/
RPC_TRANSPORT_MSG_RECEIVED, /* Complete rpc msg has been read */
RPC_TRANSPORT_CONNECT, /* client is connected to server */
RPC_TRANSPORT_MSG_SENT,
} rpc_transport_event_t;
struct rpc_transport_msg {
struct iovec *rpchdr;
int rpchdrcount;
struct iovec *proghdr;
int proghdrcount;
struct iovec *progpayload;
int progpayloadcount;
struct iobref *iobref;
};
typedef struct rpc_transport_msg rpc_transport_msg_t;
struct rpc_transport_rsp {
struct iovec *rsphdr;
int rsphdr_count;
struct iovec *rsp_payload;
int rsp_payload_count;
struct iobref *rsp_iobref;
};
typedef struct rpc_transport_rsp rpc_transport_rsp_t;
struct rpc_transport_req {
rpc_transport_msg_t msg;
rpc_transport_rsp_t rsp;
};
typedef struct rpc_transport_req rpc_transport_req_t;
struct rpc_transport_reply {
rpc_transport_msg_t msg;
void *private;
};
typedef struct rpc_transport_reply rpc_transport_reply_t;
struct rpc_transport_data {
char is_request;
union {
rpc_transport_req_t req;
rpc_transport_reply_t reply;
} data;
};
typedef struct rpc_transport_data rpc_transport_data_t;
struct rpc_request_info {
uint32_t xid;
int prognum;
int progver;
int procnum;
rpc_transport_rsp_t rsp;
};
typedef struct rpc_request_info rpc_request_info_t;
struct rpc_transport_pollin {
struct iovec vector[2];
int count;
char vectored;
void *private;
struct iobref *iobref;
};
typedef struct rpc_transport_pollin rpc_transport_pollin_t;
typedef int (*rpc_transport_notify_t) (rpc_transport_t *, void *mydata,
rpc_transport_event_t, void *data, ...);
struct rpc_transport {
struct rpc_transport_ops *ops;
void *private;
void *xl_private;
void *mydata;
pthread_mutex_t lock;
int32_t refcount;
glusterfs_ctx_t *ctx;
dict_t *options;
char *name;
void *dnscache;
data_t *buf;
int32_t (*init) (rpc_transport_t *this);
void (*fini) (rpc_transport_t *this);
rpc_transport_notify_t notify;
void *notify_data;
peer_info_t peerinfo;
peer_info_t myinfo;
rpc_transport_t *peer_trans;
struct {
pthread_mutex_t mutex;
pthread_cond_t cond;
pthread_t thread;
struct list_head msgs;
/* any request/reply will be transformed as pollin data on the
* peer, hence we are building up a pollin data even before
* handing it over to peer rpc_transport. In order to decide whether
* the pollin data is vectored or simple, we follow a simple
* algo i.e., if there is a progpayload in request/reply, its
* considered vectored, otherwise its a simple pollin data.
*/
rpc_transport_pollin_t *msg;
} handover;
};
typedef struct {
rpc_transport_pollin_t *pollin;
struct list_head list;
} rpc_transport_handover_t;
struct rpc_transport_ops {
/* no need of receive op, msg will be delivered through an event
* notification
*/
int32_t (*submit_request) (rpc_transport_t *this,
rpc_transport_req_t *req);
int32_t (*submit_reply) (rpc_transport_t *this,
rpc_transport_reply_t *reply);
int32_t (*connect) (rpc_transport_t *this);
int32_t (*listen) (rpc_transport_t *this);
int32_t (*disconnect) (rpc_transport_t *this);
int32_t (*get_peername) (rpc_transport_t *this, char *hostname,
int hostlen);
int32_t (*get_peeraddr) (rpc_transport_t *this, char *peeraddr,
int addrlen, struct sockaddr *sa,
socklen_t sasize);
int32_t (*get_myname) (rpc_transport_t *this, char *hostname,
int hostlen);
int32_t (*get_myaddr) (rpc_transport_t *this, char *peeraddr,
int addrlen, struct sockaddr *sa,
socklen_t sasize);
};
int32_t
rpc_transport_listen (rpc_transport_t *this);
int32_t
rpc_transport_connect (rpc_transport_t *this);
int32_t
rpc_transport_disconnect (rpc_transport_t *this);
int32_t
rpc_transport_notify (rpc_transport_t *this, rpc_transport_event_t event,
void *data, ...);
int32_t
rpc_transport_submit_request (rpc_transport_t *this, rpc_transport_req_t *req);
int32_t
rpc_transport_submit_reply (rpc_transport_t *this,
rpc_transport_reply_t *reply);
int32_t
rpc_transport_destroy (rpc_transport_t *this);
rpc_transport_t *
rpc_transport_load (glusterfs_ctx_t *ctx, dict_t *options, char *name);
rpc_transport_t *
rpc_transport_ref (rpc_transport_t *trans);
int32_t
rpc_transport_unref (rpc_transport_t *trans);
int
rpc_transport_setpeer (rpc_transport_t *trans, rpc_transport_t *trans_peer);
int
rpc_transport_register_notify (rpc_transport_t *trans, rpc_transport_notify_t,
void *mydata);
int32_t
rpc_transport_get_peername (rpc_transport_t *this, char *hostname, int hostlen);
int32_t
rpc_transport_get_peeraddr (rpc_transport_t *this, char *peeraddr, int addrlen,
struct sockaddr *sa, size_t salen);
int32_t
rpc_transport_get_myname (rpc_transport_t *this, char *hostname, int hostlen);
int32_t
rpc_transport_get_myaddr (rpc_transport_t *this, char *peeraddr, int addrlen,
struct sockaddr *sa, size_t salen);
rpc_transport_pollin_t *
rpc_transport_pollin_alloc (rpc_transport_t *this, struct iovec *vector,
int count, struct iobref *iobref, void *private);
void
rpc_transport_pollin_destroy (rpc_transport_pollin_t *pollin);
#endif /* __RPC_TRANSPORT_H__ */
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