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_util.h"
  18 #include "user.h"
  19 #include "os.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                 printk("daemon_open : control socket failed, errno = %d\n",
  59                        errno);
  60                 return(-errno);
  61         }
  62
  63         if(connect(pri->control, (struct sockaddr *) ctl_addr,
  64                    sizeof(*ctl_addr)) < 0){
  65                 printk("daemon_open : control connect failed, errno = %d\n",
  66                        errno);
  67                 err = -errno;
  68                 goto out;
  69         }
  70
  71         fd = socket(AF_UNIX, SOCK_DGRAM, 0);
  72         if(fd < 0){
  73                 printk("daemon_open : data socket failed, errno = %d\n",
  74                        errno);
  75                 err = -errno;
  76                 goto out;
  77         }
  78         if(bind(fd, (struct sockaddr *) local_addr, sizeof(*local_addr)) < 0){
  79                 printk("daemon_open : data bind failed, errno = %d\n",
  80                        errno);
  81                 err = -errno;
  82                 goto out_close;
  83         }
  84
  85         sun = um_kmalloc(sizeof(struct sockaddr_un));
  86         if(sun == NULL){
  87                 printk("new_addr: allocation of sockaddr_un failed\n");
  88                 err = -ENOMEM;
  89                 goto out_close;
  90         }
  91
  92         req.magic = SWITCH_MAGIC;
  93         req.version = SWITCH_VERSION;
  94         req.type = REQ_NEW_CONTROL;
  95         req.sock = *local_addr;
  96         n = os_write_file(pri->control, &req, sizeof(req));
  97         if(n != sizeof(req)){
  98                 printk("daemon_open : control setup request failed, err = %d\n",
  99                        -n);
 100                 err = -ENOTCONN;
 101                 goto out_free;
 102         }
 103
 104         n = os_read_file(pri->control, sun, sizeof(*sun));
 105         if(n != sizeof(*sun)){
 106                 printk("daemon_open : read of data socket failed, err = %d\n",
 107                        -n);
 108                 err = -ENOTCONN;
 109                 goto out_free;
 110         }
 111
 112         pri->data_addr = sun;
 113         return(fd);
 114
 115  out_free:
 116         kfree(sun);
 117  out_close:
 118         os_close_file(fd);
 119  out:
 120         os_close_file(pri->control);
 121         return(err);
 122 }
 123
 124 static void daemon_user_init(void *data, void *dev)
 125 {
 126         struct daemon_data *pri = data;
 127         struct timeval tv;
 128         struct {
 129                 char zero;
 130                 int pid;
 131                 int usecs;
 132         } name;
 133
 134         if(!strcmp(pri->sock_type, "unix"))
 135                 pri->ctl_addr = new_addr(pri->ctl_sock,
 136                                          strlen(pri->ctl_sock) + 1);
 137         name.zero = 0;
 138         name.pid = os_getpid();
 139         gettimeofday(&tv, NULL);
 140         name.usecs = tv.tv_usec;
 141         pri->local_addr = new_addr(&name, sizeof(name));
 142         pri->dev = dev;
 143         pri->fd = connect_to_switch(pri);
 144         if(pri->fd < 0){
 145                 kfree(pri->local_addr);
 146                 pri->local_addr = NULL;
 147         }
 148 }
 149
 150 static int daemon_open(void *data)
 151 {
 152         struct daemon_data *pri = data;
 153         return(pri->fd);
 154 }
 155
 156 static void daemon_remove(void *data)
 157 {
 158         struct daemon_data *pri = data;
 159
 160         os_close_file(pri->fd);
 161         pri->fd = -1;
 162         os_close_file(pri->control);
 163         pri->control = -1;
 164
 165         kfree(pri->data_addr);
 166         pri->data_addr = NULL;
 167         kfree(pri->ctl_addr);
 168         pri->ctl_addr = NULL;
 169         kfree(pri->local_addr);
 170         pri->local_addr = NULL;
 171 }
 172
 173 int daemon_user_write(int fd, void *buf, int len, struct daemon_data *pri)
 174 {
 175         struct sockaddr_un *data_addr = pri->data_addr;
 176
 177         return(net_sendto(fd, buf, len, data_addr, sizeof(*data_addr)));
 178 }
 179
 180 static int daemon_set_mtu(int mtu, void *data)
 181 {
 182         return(mtu);
 183 }
 184
 185 const struct net_user_info daemon_user_info = {
 186         .init           = daemon_user_init,
 187         .open           = daemon_open,
 188         .close          = NULL,
 189         .remove         = daemon_remove,
 190         .set_mtu        = daemon_set_mtu,
 191         .add_address    = NULL,
 192         .delete_address = NULL,
 193         .max_packet     = MAX_PACKET - ETH_HEADER_OTHER
 194 };
 195
 196 /*
 197  * Overrides for Emacs so that we follow Linus's tabbing style.
 198  * Emacs will notice this stuff at the end of the file and automatically
 199  * adjust the settings for this buffer only.  This must remain at the end
 200  * of the file.
 201  * ---------------------------------------------------------------------------
 202  * Local variables:
 203  * c-file-style: "linux"
 204  * End:
 205  */