release/src-rt-6.x/linux/linux-2.6/arch/um/drivers/daemon_user.c

   1 /*
   2  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
   3  * James Leu (jleu@mindspring.net).
   4  * Copyright (C) 2001 by various other people who didn't put their name here.
   5  * Licensed under the GPL.
   6  */
   7
   8 #include <errno.h>
   9 #include <unistd.h>
  10 #include <stdint.h>
  11 #include <sys/socket.h>
  12 #include <sys/un.h>
  13 #include <sys/time.h>
  14 #include "net_user.h"
  15 #include "daemon.h"
  16 #include "kern_util.h"
  17 #include "user.h"
  18 #include "os.h"
  19 #include "um_malloc.h"
  20
  21 #define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER)
  22
  23 enum request_type { REQ_NEW_CONTROL };
  24
  25 #define SWITCH_MAGIC 0xfeedface
  26
  27 struct request_v3 {
  28         uint32_t magic;
  29         uint32_t version;
  30         enum request_type type;
  31         struct sockaddr_un sock;
  32 };
  33
  34 static struct sockaddr_un *new_addr(void *name, int len)
  35 {
  36         struct sockaddr_un *sun;
  37
  38         sun = um_kmalloc(sizeof(struct sockaddr_un));
  39         if(sun == NULL){
  40                 printk("new_addr: allocation of sockaddr_un failed\n");
  41                 return NULL;
  42         }
  43         sun->sun_family = AF_UNIX;
  44         memcpy(sun->sun_path, name, len);
  45         return sun;
  46 }
  47
  48 static int connect_to_switch(struct daemon_data *pri)
  49 {
  50         struct sockaddr_un *ctl_addr = pri->ctl_addr;
  51         struct sockaddr_un *local_addr = pri->local_addr;
  52         struct sockaddr_un *sun;
  53         struct request_v3 req;
  54         int fd, n, err;
  55
  56         pri->control = socket(AF_UNIX, SOCK_STREAM, 0);
  57         if(pri->control < 0){
  58                 err = -errno;
  59                 printk("daemon_open : control socket failed, errno = %d\n",
  60                        -err);
  61                 return err;
  62         }
  63
  64         if(connect(pri->control, (struct sockaddr *) ctl_addr,
  65                    sizeof(*ctl_addr)) < 0){
  66                 err = -errno;
  67                 printk("daemon_open : control connect failed, errno = %d\n",
  68                        -err);
  69                 goto out;
  70         }
  71
  72         fd = socket(AF_UNIX, SOCK_DGRAM, 0);
  73         if(fd < 0){
  74                 err = -errno;
  75                 printk("daemon_open : data socket failed, errno = %d\n",
  76                        -err);
  77                 goto out;
  78         }
  79         if(bind(fd, (struct sockaddr *) local_addr, sizeof(*local_addr)) < 0){
  80                 err = -errno;
  81                 printk("daemon_open : data bind failed, errno = %d\n",
  82                        -err);
  83                 goto out_close;
  84         }
  85
  86         sun = um_kmalloc(sizeof(struct sockaddr_un));
  87         if(sun == NULL){
  88                 printk("new_addr: allocation of sockaddr_un 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 = os_write_file(pri->control, &req, sizeof(req));
  98         if(n != sizeof(req)){
  99                 printk("daemon_open : control setup request failed, err = %d\n",
 100                        -n);
 101                 err = -ENOTCONN;
 102                 goto out_free;
 103         }
 104
 105         n = os_read_file(pri->control, sun, sizeof(*sun));
 106         if(n != sizeof(*sun)){
 107                 printk("daemon_open : read of data socket failed, err = %d\n",
 108                        -n);
 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         os_close_file(fd);
 120  out:
 121         os_close_file(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         os_close_file(pri->fd);
 165         pri->fd = -1;
 166         os_close_file(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 static int daemon_set_mtu(int mtu, void *data)
 185 {
 186         return mtu;
 187 }
 188
 189 const struct net_user_info daemon_user_info = {
 190         .init           = daemon_user_init,
 191         .open           = daemon_open,
 192         .close          = NULL,
 193         .remove         = daemon_remove,
 194         .set_mtu        = daemon_set_mtu,
 195         .add_address    = NULL,
 196         .delete_address = NULL,
 197         .max_packet     = MAX_PACKET - ETH_HEADER_OTHER
 198 };