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1 /*
2  * Copyright 2006 IBM Corporation
3  * IUCV protocol stack for Linux on zSeries
4  * Version 1.0
5  * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
6  *
7  */
8 
9 #ifndef __AFIUCV_H
10 #define __AFIUCV_H
11 
12 #include <asm/types.h>
13 #include <asm/byteorder.h>
14 #include <linux/list.h>
15 #include <linux/poll.h>
16 #include <linux/socket.h>
17 #include <net/iucv/iucv.h>
18 
19 #ifndef AF_IUCV
20 #define AF_IUCV		32
21 #define PF_IUCV		AF_IUCV
22 #endif
23 
24 /* Connection and socket states */
25 enum {
26 	IUCV_CONNECTED = 1,
27 	IUCV_OPEN,
28 	IUCV_BOUND,
29 	IUCV_LISTEN,
30 	IUCV_DISCONN,
31 	IUCV_CLOSING,
32 	IUCV_CLOSED
33 };
34 
35 #define IUCV_QUEUELEN_DEFAULT	65535
36 #define IUCV_HIPER_MSGLIM_DEFAULT	128
37 #define IUCV_CONN_TIMEOUT	(HZ * 40)
38 #define IUCV_DISCONN_TIMEOUT	(HZ * 2)
39 #define IUCV_CONN_IDLE_TIMEOUT	(HZ * 60)
40 #define IUCV_BUFSIZE_DEFAULT	32768
41 
42 /* IUCV socket address */
43 struct sockaddr_iucv {
44 	sa_family_t	siucv_family;
45 	unsigned short	siucv_port;		/* Reserved */
46 	unsigned int	siucv_addr;		/* Reserved */
47 	char		siucv_nodeid[8];	/* Reserved */
48 	char		siucv_user_id[8];	/* Guest User Id */
49 	char		siucv_name[8];		/* Application Name */
50 };
51 
52 
53 /* Common socket structures and functions */
54 struct sock_msg_q {
55 	struct iucv_path	*path;
56 	struct iucv_message	msg;
57 	struct list_head	list;
58 	spinlock_t		lock;
59 };
60 
61 #define AF_IUCV_FLAG_ACK 0x1
62 #define AF_IUCV_FLAG_SYN 0x2
63 #define AF_IUCV_FLAG_FIN 0x4
64 #define AF_IUCV_FLAG_WIN 0x8
65 #define AF_IUCV_FLAG_SHT 0x10
66 
67 struct af_iucv_trans_hdr {
68 	u16 magic;
69 	u8 version;
70 	u8 flags;
71 	u16 window;
72 	char destNodeID[8];
73 	char destUserID[8];
74 	char destAppName[16];
75 	char srcNodeID[8];
76 	char srcUserID[8];
77 	char srcAppName[16];             /* => 70 bytes */
78 	struct iucv_message iucv_hdr;    /* => 33 bytes */
79 	u8 pad;                          /* total 104 bytes */
80 } __packed;
81 
82 enum iucv_tx_notify {
83 	/* transmission of skb is completed and was successful */
84 	TX_NOTIFY_OK = 0,
85 	/* target is unreachable */
86 	TX_NOTIFY_UNREACHABLE = 1,
87 	/* transfer pending queue full */
88 	TX_NOTIFY_TPQFULL = 2,
89 	/* general error */
90 	TX_NOTIFY_GENERALERROR = 3,
91 	/* transmission of skb is pending - may interleave
92 	 * with TX_NOTIFY_DELAYED_* */
93 	TX_NOTIFY_PENDING = 4,
94 	/* transmission of skb was done successfully (delayed) */
95 	TX_NOTIFY_DELAYED_OK = 5,
96 	/* target unreachable (detected delayed) */
97 	TX_NOTIFY_DELAYED_UNREACHABLE = 6,
98 	/* general error (detected delayed) */
99 	TX_NOTIFY_DELAYED_GENERALERROR = 7,
100 };
101 
102 #define iucv_sk(__sk) ((struct iucv_sock *) __sk)
103 
104 #define AF_IUCV_TRANS_IUCV 0
105 #define AF_IUCV_TRANS_HIPER 1
106 
107 struct iucv_sock {
108 	struct sock		sk;
109 	char			src_user_id[8];
110 	char			src_name[8];
111 	char			dst_user_id[8];
112 	char			dst_name[8];
113 	struct list_head	accept_q;
114 	spinlock_t		accept_q_lock;
115 	struct sock		*parent;
116 	struct iucv_path	*path;
117 	struct net_device	*hs_dev;
118 	struct sk_buff_head	send_skb_q;
119 	struct sk_buff_head	backlog_skb_q;
120 	struct sock_msg_q	message_q;
121 	unsigned int		send_tag;
122 	u8			flags;
123 	u16			msglimit;
124 	u16			msglimit_peer;
125 	atomic_t		msg_sent;
126 	atomic_t		msg_recv;
127 	atomic_t		pendings;
128 	int			transport;
129 	void                    (*sk_txnotify)(struct sk_buff *skb,
130 					       enum iucv_tx_notify n);
131 };
132 
133 struct iucv_skb_cb {
134 	u32	class;		/* target class of message */
135 	u32	tag;		/* tag associated with message */
136 	u32	offset;		/* offset for skb receival */
137 };
138 
139 #define IUCV_SKB_CB(__skb)	((struct iucv_skb_cb *)&((__skb)->cb[0]))
140 
141 /* iucv socket options (SOL_IUCV) */
142 #define SO_IPRMDATA_MSG	0x0080		/* send/recv IPRM_DATA msgs */
143 #define SO_MSGLIMIT	0x1000		/* get/set IUCV MSGLIMIT */
144 #define SO_MSGSIZE	0x0800		/* get maximum msgsize */
145 
146 /* iucv related control messages (scm) */
147 #define SCM_IUCV_TRGCLS	0x0001		/* target class control message */
148 
149 struct iucv_sock_list {
150 	struct hlist_head head;
151 	rwlock_t	  lock;
152 	atomic_t	  autobind_name;
153 };
154 
155 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
156 			    poll_table *wait);
157 void iucv_sock_link(struct iucv_sock_list *l, struct sock *s);
158 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *s);
159 void iucv_accept_enqueue(struct sock *parent, struct sock *sk);
160 void iucv_accept_unlink(struct sock *sk);
161 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock);
162 
163 #endif /* __IUCV_H */
164