2 * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
6 #include "linux/list.h"
7 #include "linux/sched.h"
8 #include "linux/slab.h"
9 #include "linux/interrupt.h"
10 #include "linux/irq.h"
11 #include "linux/spinlock.h"
12 #include "linux/errno.h"
13 #include "asm/semaphore.h"
14 #include "asm/errno.h"
15 #include "kern_util.h"
24 struct list_head list
;
30 struct list_head pending
;
31 struct list_head connections
;
35 struct port_list
*port
;
41 struct list_head list
;
46 struct port_list
*port
;
49 static irqreturn_t
pipe_interrupt(int irq
, void *data
, struct pt_regs
*regs
)
51 struct connection
*conn
= data
;
54 fd
= os_rcv_fd(conn
->socket
[0], &conn
->helper_pid
);
59 printk(KERN_ERR
"pipe_interrupt : os_rcv_fd returned %d\n",
61 os_close_file(conn
->fd
);
64 list_del(&conn
->list
);
67 list_add(&conn
->list
, &conn
->port
->connections
);
73 static int port_accept(struct port_list
*port
)
75 struct connection
*conn
;
76 int fd
, socket
[2], pid
, ret
= 0;
78 fd
= port_connection(port
->fd
, socket
, &pid
);
81 printk(KERN_ERR
"port_accept : port_connection "
82 "returned %d\n", -fd
);
86 conn
= kmalloc(sizeof(*conn
), GFP_ATOMIC
);
88 printk(KERN_ERR
"port_accept : failed to allocate "
92 *conn
= ((struct connection
)
93 { .list
= LIST_HEAD_INIT(conn
->list
),
95 .socket
= { socket
[0], socket
[1] },
99 if(um_request_irq(TELNETD_IRQ
, socket
[0], IRQ_READ
, pipe_interrupt
,
100 SA_INTERRUPT
| SA_SHIRQ
| SA_SAMPLE_RANDOM
,
102 printk(KERN_ERR
"port_accept : failed to get IRQ for "
107 list_add(&conn
->list
, &port
->pending
);
115 os_kill_process(pid
, 1);
120 DECLARE_MUTEX(ports_sem
);
121 struct list_head ports
= LIST_HEAD_INIT(ports
);
123 void port_work_proc(void *unused
)
125 struct port_list
*port
;
126 struct list_head
*ele
;
129 local_irq_save(flags
);
130 list_for_each(ele
, &ports
){
131 port
= list_entry(ele
, struct port_list
, list
);
132 if(!port
->has_connection
)
134 reactivate_fd(port
->fd
, ACCEPT_IRQ
);
135 while(port_accept(port
)) ;
136 port
->has_connection
= 0;
138 local_irq_restore(flags
);
141 DECLARE_WORK(port_work
, port_work_proc
, NULL
);
143 static irqreturn_t
port_interrupt(int irq
, void *data
, struct pt_regs
*regs
)
145 struct port_list
*port
= data
;
147 port
->has_connection
= 1;
148 schedule_work(&port_work
);
152 void *port_data(int port_num
)
154 struct list_head
*ele
;
155 struct port_list
*port
;
156 struct port_dev
*dev
= NULL
;
160 list_for_each(ele
, &ports
){
161 port
= list_entry(ele
, struct port_list
, list
);
162 if(port
->port
== port_num
) goto found
;
164 port
= kmalloc(sizeof(struct port_list
), GFP_KERNEL
);
166 printk(KERN_ERR
"Allocation of port list failed\n");
170 fd
= port_listen_fd(port_num
);
172 printk(KERN_ERR
"binding to port %d failed, errno = %d\n",
176 if(um_request_irq(ACCEPT_IRQ
, fd
, IRQ_READ
, port_interrupt
,
177 SA_INTERRUPT
| SA_SHIRQ
| SA_SAMPLE_RANDOM
, "port",
179 printk(KERN_ERR
"Failed to get IRQ for port %d\n", port_num
);
183 *port
= ((struct port_list
)
184 { .list
= LIST_HEAD_INIT(port
->list
),
186 .sem
= __SEMAPHORE_INITIALIZER(port
->sem
,
188 .lock
= SPIN_LOCK_UNLOCKED
,
191 .pending
= LIST_HEAD_INIT(port
->pending
),
192 .connections
= LIST_HEAD_INIT(port
->connections
) });
193 list_add(&port
->list
, &ports
);
196 dev
= kmalloc(sizeof(struct port_dev
), GFP_KERNEL
);
198 printk(KERN_ERR
"Allocation of port device entry failed\n");
202 *dev
= ((struct port_dev
) { .port
= port
,
204 .telnetd_pid
= -1 });
216 int port_wait(void *data
)
218 struct port_dev
*dev
= data
;
219 struct connection
*conn
;
220 struct port_list
*port
= dev
->port
;
224 if(down_interruptible(&port
->sem
))
225 return(-ERESTARTSYS
);
227 spin_lock(&port
->lock
);
229 conn
= list_entry(port
->connections
.next
, struct connection
,
231 list_del(&conn
->list
);
232 spin_unlock(&port
->lock
);
234 os_shutdown_socket(conn
->socket
[0], 1, 1);
235 os_close_file(conn
->socket
[0]);
236 os_shutdown_socket(conn
->socket
[1], 1, 1);
237 os_close_file(conn
->socket
[1]);
239 /* This is done here because freeing an IRQ can't be done
240 * within the IRQ handler. So, pipe_interrupt always ups
241 * the semaphore regardless of whether it got a successful
242 * connection. Then we loop here throwing out failed
243 * connections until a good one is found.
245 free_irq(TELNETD_IRQ
, conn
);
247 if(conn
->fd
>= 0) break;
248 os_close_file(conn
->fd
);
253 dev
->helper_pid
= conn
->helper_pid
;
254 dev
->telnetd_pid
= conn
->telnetd_pid
;
260 void port_remove_dev(void *d
)
262 struct port_dev
*dev
= d
;
264 if(dev
->helper_pid
!= -1)
265 os_kill_process(dev
->helper_pid
, 0);
266 if(dev
->telnetd_pid
!= -1)
267 os_kill_process(dev
->telnetd_pid
, 1);
268 dev
->helper_pid
= -1;
269 dev
->telnetd_pid
= -1;
272 void port_kern_free(void *d
)
274 struct port_dev
*dev
= d
;
276 port_remove_dev(dev
);
280 static void free_port(void)
282 struct list_head
*ele
;
283 struct port_list
*port
;
285 list_for_each(ele
, &ports
){
286 port
= list_entry(ele
, struct port_list
, list
);
287 free_irq_by_fd(port
->fd
);
288 os_close_file(port
->fd
);
292 __uml_exitcall(free_port
);
295 * Overrides for Emacs so that we follow Linus's tabbing style.
296 * Emacs will notice this stuff at the end of the file and automatically
297 * adjust the settings for this buffer only. This must remain at the end
299 * ---------------------------------------------------------------------------
301 * c-file-style: "linux"