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TOMOYO Linux Cross Reference
Linux/arch/um/drivers/daemon_user.c

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  1 /*
  2  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  3  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
  4  * James Leu (jleu@mindspring.net).
  5  * Copyright (C) 2001 by various other people who didn't put their name here.
  6  * Licensed under the GPL.
  7  */
  8 
  9 #include <stdint.h>
 10 #include <unistd.h>
 11 #include <errno.h>
 12 #include <sys/types.h>
 13 #include <sys/socket.h>
 14 #include <sys/time.h>
 15 #include <sys/un.h>
 16 #include "daemon.h"
 17 #include <net_user.h>
 18 #include <os.h>
 19 #include <um_malloc.h>
 20 
 21 enum request_type { REQ_NEW_CONTROL };
 22 
 23 #define SWITCH_MAGIC 0xfeedface
 24 
 25 struct request_v3 {
 26         uint32_t magic;
 27         uint32_t version;
 28         enum request_type type;
 29         struct sockaddr_un sock;
 30 };
 31 
 32 static struct sockaddr_un *new_addr(void *name, int len)
 33 {
 34         struct sockaddr_un *sun;
 35 
 36         sun = uml_kmalloc(sizeof(struct sockaddr_un), UM_GFP_KERNEL);
 37         if (sun == NULL) {
 38                 printk(UM_KERN_ERR "new_addr: allocation of sockaddr_un "
 39                        "failed\n");
 40                 return NULL;
 41         }
 42         sun->sun_family = AF_UNIX;
 43         memcpy(sun->sun_path, name, len);
 44         return sun;
 45 }
 46 
 47 static int connect_to_switch(struct daemon_data *pri)
 48 {
 49         struct sockaddr_un *ctl_addr = pri->ctl_addr;
 50         struct sockaddr_un *local_addr = pri->local_addr;
 51         struct sockaddr_un *sun;
 52         struct request_v3 req;
 53         int fd, n, err;
 54 
 55         pri->control = socket(AF_UNIX, SOCK_STREAM, 0);
 56         if (pri->control < 0) {
 57                 err = -errno;
 58                 printk(UM_KERN_ERR "daemon_open : control socket failed, "
 59                        "errno = %d\n", -err);
 60                 return err;
 61         }
 62 
 63         if (connect(pri->control, (struct sockaddr *) ctl_addr,
 64                    sizeof(*ctl_addr)) < 0) {
 65                 err = -errno;
 66                 printk(UM_KERN_ERR "daemon_open : control connect failed, "
 67                        "errno = %d\n", -err);
 68                 goto out;
 69         }
 70 
 71         fd = socket(AF_UNIX, SOCK_DGRAM, 0);
 72         if (fd < 0) {
 73                 err = -errno;
 74                 printk(UM_KERN_ERR "daemon_open : data socket failed, "
 75                        "errno = %d\n", -err);
 76                 goto out;
 77         }
 78         if (bind(fd, (struct sockaddr *) local_addr, sizeof(*local_addr)) < 0) {
 79                 err = -errno;
 80                 printk(UM_KERN_ERR "daemon_open : data bind failed, "
 81                        "errno = %d\n", -err);
 82                 goto out_close;
 83         }
 84 
 85         sun = uml_kmalloc(sizeof(struct sockaddr_un), UM_GFP_KERNEL);
 86         if (sun == NULL) {
 87                 printk(UM_KERN_ERR "new_addr: allocation of sockaddr_un "
 88                        "failed\n");
 89                 err = -ENOMEM;
 90                 goto out_close;
 91         }
 92 
 93         req.magic = SWITCH_MAGIC;
 94         req.version = SWITCH_VERSION;
 95         req.type = REQ_NEW_CONTROL;
 96         req.sock = *local_addr;
 97         n = write(pri->control, &req, sizeof(req));
 98         if (n != sizeof(req)) {
 99                 printk(UM_KERN_ERR "daemon_open : control setup request "
100                        "failed, err = %d\n", -errno);
101                 err = -ENOTCONN;
102                 goto out_free;
103         }
104 
105         n = read(pri->control, sun, sizeof(*sun));
106         if (n != sizeof(*sun)) {
107                 printk(UM_KERN_ERR "daemon_open : read of data socket failed, "
108                        "err = %d\n", -errno);
109                 err = -ENOTCONN;
110                 goto out_free;
111         }
112 
113         pri->data_addr = sun;
114         return fd;
115 
116  out_free:
117         kfree(sun);
118  out_close:
119         close(fd);
120  out:
121         close(pri->control);
122         return err;
123 }
124 
125 static int daemon_user_init(void *data, void *dev)
126 {
127         struct daemon_data *pri = data;
128         struct timeval tv;
129         struct {
130                 char zero;
131                 int pid;
132                 int usecs;
133         } name;
134 
135         if (!strcmp(pri->sock_type, "unix"))
136                 pri->ctl_addr = new_addr(pri->ctl_sock,
137                                          strlen(pri->ctl_sock) + 1);
138         name.zero = 0;
139         name.pid = os_getpid();
140         gettimeofday(&tv, NULL);
141         name.usecs = tv.tv_usec;
142         pri->local_addr = new_addr(&name, sizeof(name));
143         pri->dev = dev;
144         pri->fd = connect_to_switch(pri);
145         if (pri->fd < 0) {
146                 kfree(pri->local_addr);
147                 pri->local_addr = NULL;
148                 return pri->fd;
149         }
150 
151         return 0;
152 }
153 
154 static int daemon_open(void *data)
155 {
156         struct daemon_data *pri = data;
157         return pri->fd;
158 }
159 
160 static void daemon_remove(void *data)
161 {
162         struct daemon_data *pri = data;
163 
164         close(pri->fd);
165         pri->fd = -1;
166         close(pri->control);
167         pri->control = -1;
168 
169         kfree(pri->data_addr);
170         pri->data_addr = NULL;
171         kfree(pri->ctl_addr);
172         pri->ctl_addr = NULL;
173         kfree(pri->local_addr);
174         pri->local_addr = NULL;
175 }
176 
177 int daemon_user_write(int fd, void *buf, int len, struct daemon_data *pri)
178 {
179         struct sockaddr_un *data_addr = pri->data_addr;
180 
181         return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr));
182 }
183 
184 const struct net_user_info daemon_user_info = {
185         .init           = daemon_user_init,
186         .open           = daemon_open,
187         .close          = NULL,
188         .remove         = daemon_remove,
189         .add_address    = NULL,
190         .delete_address = NULL,
191         .mtu            = ETH_MAX_PACKET,
192         .max_packet     = ETH_MAX_PACKET + ETH_HEADER_OTHER,
193 };
194 

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