/*
* Copyright 2006 IBM Corporation
* IUCV protocol stack for Linux on zSeries
* Version 1.0
* Author(s): Jennifer Hunt <[email protected]>
*
*/

#ifndef __AFIUCV_H
#define __AFIUCV_H

#include <asm/types.h>
#include <asm/byteorder.h>
#include <linux/list.h>
#include <linux/poll.h>
#include <linux/socket.h>
#include <net/iucv/iucv.h>

#ifndef AF_IUCV
#define AF_IUCV 32
#define PF_IUCV AF_IUCV
#endif

/* Connection and socket states */
enum {
IUCV_CONNECTED = 1,
IUCV_OPEN,
IUCV_BOUND,
IUCV_LISTEN,
IUCV_DISCONN,
IUCV_CLOSING,
IUCV_CLOSED
};

#define IUCV_QUEUELEN_DEFAULT 65535
#define IUCV_HIPER_MSGLIM_DEFAULT 128
#define IUCV_CONN_TIMEOUT (HZ * 40)
#define IUCV_DISCONN_TIMEOUT (HZ * 2)
#define IUCV_CONN_IDLE_TIMEOUT (HZ * 60)
#define IUCV_BUFSIZE_DEFAULT 32768

/* IUCV socket address */
struct sockaddr_iucv {
sa_family_t siucv_family;
unsigned short siucv_port; /* Reserved */
unsigned int siucv_addr; /* Reserved */
char siucv_nodeid[8]; /* Reserved */
char siucv_user_id[8]; /* Guest User Id */
char siucv_name[8]; /* Application Name */
};


/* Common socket structures and functions */
struct sock_msg_q {
struct iucv_path *path;
struct iucv_message msg;
struct list_head list;
spinlock_t lock;
};

#define AF_IUCV_FLAG_ACK 0x1
#define AF_IUCV_FLAG_SYN 0x2
#define AF_IUCV_FLAG_FIN 0x4
#define AF_IUCV_FLAG_WIN 0x8
#define AF_IUCV_FLAG_SHT 0x10

struct af_iucv_trans_hdr {
u16 magic;
u8 version;
u8 flags;
u16 window;
char destNodeID[8];
char destUserID[8];
char destAppName[16];
char srcNodeID[8];
char srcUserID[8];
char srcAppName[16]; /* => 70 bytes */
struct iucv_message iucv_hdr; /* => 33 bytes */
u8 pad; /* total 104 bytes */
} __packed;

enum iucv_tx_notify {
/* transmission of skb is completed and was successful */
TX_NOTIFY_OK = 0,
/* target is unreachable */
TX_NOTIFY_UNREACHABLE = 1,
/* transfer pending queue full */
TX_NOTIFY_TPQFULL = 2,
/* general error */
TX_NOTIFY_GENERALERROR = 3,
/* transmission of skb is pending - may interleave
* with TX_NOTIFY_DELAYED_* */
TX_NOTIFY_PENDING = 4,
/* transmission of skb was done successfully (delayed) */
TX_NOTIFY_DELAYED_OK = 5,
/* target unreachable (detected delayed) */
TX_NOTIFY_DELAYED_UNREACHABLE = 6,
/* general error (detected delayed) */
TX_NOTIFY_DELAYED_GENERALERROR = 7,
};

#define iucv_sk(__sk) ((struct iucv_sock *) __sk)

#define AF_IUCV_TRANS_IUCV 0
#define AF_IUCV_TRANS_HIPER 1

struct iucv_sock {
struct sock sk;
char src_user_id[8];
char src_name[8];
char dst_user_id[8];
char dst_name[8];
struct list_head accept_q;
spinlock_t accept_q_lock;
struct sock *parent;
struct iucv_path *path;
struct net_device *hs_dev;
struct sk_buff_head send_skb_q;
struct sk_buff_head backlog_skb_q;
struct sock_msg_q message_q;
unsigned int send_tag;
u8 flags;
u16 msglimit;
u16 msglimit_peer;
atomic_t msg_sent;
atomic_t msg_recv;
atomic_t pendings;
int transport;
void (*sk_txnotify)(struct sk_buff *skb,
enum iucv_tx_notify n);
};

struct iucv_skb_cb {
u32 class; /* target class of message */
u32 tag; /* tag associated with message */
u32 offset; /* offset for skb receival */
};

#define IUCV_SKB_CB(__skb) ((struct iucv_skb_cb *)&((__skb)->cb[0]))

/* iucv socket options (SOL_IUCV) */
#define SO_IPRMDATA_MSG 0x0080 /* send/recv IPRM_DATA msgs */
#define SO_MSGLIMIT 0x1000 /* get/set IUCV MSGLIMIT */
#define SO_MSGSIZE 0x0800 /* get maximum msgsize */

/* iucv related control messages (scm) */
#define SCM_IUCV_TRGCLS 0x0001 /* target class control message */

struct iucv_sock_list {
struct hlist_head head;
rwlock_t lock;
atomic_t autobind_name;
};

unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
poll_table *wait);
void iucv_sock_link(struct iucv_sock_list *l, struct sock *s);
void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *s);
void iucv_accept_enqueue(struct sock *parent, struct sock *sk);
void iucv_accept_unlink(struct sock *sk);
struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock);

#endif /* __IUCV_H */