1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Copyright 2006 IBM Corporation
4  * IUCV protocol stack for Linux on zSeries
5  * Version 1.0
6  * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
7  *
8  */
9 
10 #ifndef __AFIUCV_H
11 #define __AFIUCV_H
12 
13 #include <asm/types.h>
14 #include <asm/byteorder.h>
15 #include <linux/list.h>
16 #include <linux/poll.h>
17 #include <linux/socket.h>
18 #include <net/iucv/iucv.h>
19 
20 #ifndef AF_IUCV
21 #define AF_IUCV		32
22 #define PF_IUCV		AF_IUCV
23 #endif
24 
25 /* Connection and socket states */
26 enum {
27 	IUCV_CONNECTED = 1,
28 	IUCV_OPEN,
29 	IUCV_BOUND,
30 	IUCV_LISTEN,
31 	IUCV_DISCONN,
32 	IUCV_CLOSING,
33 	IUCV_CLOSED
34 };
35 
36 #define IUCV_QUEUELEN_DEFAULT	65535
37 #define IUCV_HIPER_MSGLIM_DEFAULT	128
38 #define IUCV_CONN_TIMEOUT	(HZ * 40)
39 #define IUCV_DISCONN_TIMEOUT	(HZ * 2)
40 #define IUCV_CONN_IDLE_TIMEOUT	(HZ * 60)
41 #define IUCV_BUFSIZE_DEFAULT	32768
42 
43 /* IUCV socket address */
44 struct sockaddr_iucv {
45 	sa_family_t	siucv_family;
46 	unsigned short	siucv_port;		/* Reserved */
47 	unsigned int	siucv_addr;		/* Reserved */
48 	char		siucv_nodeid[8];	/* Reserved */
49 	char		siucv_user_id[8];	/* Guest User Id */
50 	char		siucv_name[8];		/* Application Name */
51 };
52 
53 
54 /* Common socket structures and functions */
55 struct sock_msg_q {
56 	struct iucv_path	*path;
57 	struct iucv_message	msg;
58 	struct list_head	list;
59 	spinlock_t		lock;
60 };
61 
62 #define AF_IUCV_FLAG_ACK 0x1
63 #define AF_IUCV_FLAG_SYN 0x2
64 #define AF_IUCV_FLAG_FIN 0x4
65 #define AF_IUCV_FLAG_WIN 0x8
66 #define AF_IUCV_FLAG_SHT 0x10
67 
68 struct af_iucv_trans_hdr {
69 	u16 magic;
70 	u8 version;
71 	u8 flags;
72 	u16 window;
73 	char destNodeID[8];
74 	char destUserID[8];
75 	char destAppName[16];
76 	char srcNodeID[8];
77 	char srcUserID[8];
78 	char srcAppName[16];             /* => 70 bytes */
79 	struct iucv_message iucv_hdr;    /* => 33 bytes */
80 	u8 pad;                          /* total 104 bytes */
81 } __packed;
82 
83 enum iucv_tx_notify {
84 	/* transmission of skb is completed and was successful */
85 	TX_NOTIFY_OK = 0,
86 	/* target is unreachable */
87 	TX_NOTIFY_UNREACHABLE = 1,
88 	/* transfer pending queue full */
89 	TX_NOTIFY_TPQFULL = 2,
90 	/* general error */
91 	TX_NOTIFY_GENERALERROR = 3,
92 	/* transmission of skb is pending - may interleave
93 	 * with TX_NOTIFY_DELAYED_* */
94 	TX_NOTIFY_PENDING = 4,
95 	/* transmission of skb was done successfully (delayed) */
96 	TX_NOTIFY_DELAYED_OK = 5,
97 	/* target unreachable (detected delayed) */
98 	TX_NOTIFY_DELAYED_UNREACHABLE = 6,
99 	/* general error (detected delayed) */
100 	TX_NOTIFY_DELAYED_GENERALERROR = 7,
101 };
102 
103 #define iucv_sk(__sk) ((struct iucv_sock *) __sk)
104 
105 #define AF_IUCV_TRANS_IUCV 0
106 #define AF_IUCV_TRANS_HIPER 1
107 
108 struct iucv_sock {
109 	struct sock		sk;
110 	char			src_user_id[8];
111 	char			src_name[8];
112 	char			dst_user_id[8];
113 	char			dst_name[8];
114 	struct list_head	accept_q;
115 	spinlock_t		accept_q_lock;
116 	struct sock		*parent;
117 	struct iucv_path	*path;
118 	struct net_device	*hs_dev;
119 	struct sk_buff_head	send_skb_q;
120 	struct sk_buff_head	backlog_skb_q;
121 	struct sock_msg_q	message_q;
122 	unsigned int		send_tag;
123 	u8			flags;
124 	u16			msglimit;
125 	u16			msglimit_peer;
126 	atomic_t		msg_sent;
127 	atomic_t		msg_recv;
128 	atomic_t		pendings;
129 	int			transport;
130 	void                    (*sk_txnotify)(struct sk_buff *skb,
131 					       enum iucv_tx_notify n);
132 };
133 
134 struct iucv_skb_cb {
135 	u32	class;		/* target class of message */
136 	u32	tag;		/* tag associated with message */
137 	u32	offset;		/* offset for skb receival */
138 };
139 
140 #define IUCV_SKB_CB(__skb)	((struct iucv_skb_cb *)&((__skb)->cb[0]))
141 
142 /* iucv socket options (SOL_IUCV) */
143 #define SO_IPRMDATA_MSG	0x0080		/* send/recv IPRM_DATA msgs */
144 #define SO_MSGLIMIT	0x1000		/* get/set IUCV MSGLIMIT */
145 #define SO_MSGSIZE	0x0800		/* get maximum msgsize */
146 
147 /* iucv related control messages (scm) */
148 #define SCM_IUCV_TRGCLS	0x0001		/* target class control message */
149 
150 struct iucv_sock_list {
151 	struct hlist_head head;
152 	rwlock_t	  lock;
153 	atomic_t	  autobind_name;
154 };
155 
156 __poll_t iucv_sock_poll(struct file *file, struct socket *sock,
157 			    poll_table *wait);
158 void iucv_sock_link(struct iucv_sock_list *l, struct sock *s);
159 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *s);
160 void iucv_accept_enqueue(struct sock *parent, struct sock *sk);
161 void iucv_accept_unlink(struct sock *sk);
162 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock);
163 
164 #endif /* __IUCV_H */
165