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;
 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_close;
 110         }
 111
 112         pri->data_addr = sun;
 113         return(fd);
 114
 115  out_close:
 116         os_close_file(fd);
 117  out:
 118         os_close_file(pri->control);
 119         return(err);
 120 }
 121
 122 static void daemon_user_init(void *data, void *dev)
 123 {
 124         struct daemon_data *pri = data;
 125         struct timeval tv;
 126         struct {
 127                 char zero;
 128                 int pid;
 129                 int usecs;
 130         } name;
 131
 132         if(!strcmp(pri->sock_type, "unix"))
 133                 pri->ctl_addr = new_addr(pri->ctl_sock,
 134                                          strlen(pri->ctl_sock) + 1);
 135         name.zero = 0;
 136         name.pid = os_getpid();
 137         gettimeofday(&tv, NULL);
 138         name.usecs = tv.tv_usec;
 139         pri->local_addr = new_addr(&name, sizeof(name));
 140         pri->dev = dev;
 141         pri->fd = connect_to_switch(pri);
 142         if(pri->fd < 0){
 143                 kfree(pri->local_addr);
 144                 pri->local_addr = NULL;
 145         }
 146 }
 147
 148 static int daemon_open(void *data)
 149 {
 150         struct daemon_data *pri = data;
 151         return(pri->fd);
 152 }
 153
 154 static void daemon_remove(void *data)
 155 {
 156         struct daemon_data *pri = data;
 157
 158         os_close_file(pri->fd);
 159         os_close_file(pri->control);
 160         kfree(pri->data_addr);
 161         kfree(pri->ctl_addr);
 162         kfree(pri->local_addr);
 163 }
 164
 165 int daemon_user_write(int fd, void *buf, int len, struct daemon_data *pri)
 166 {
 167         struct sockaddr_un *data_addr = pri->data_addr;
 168
 169         return(net_sendto(fd, buf, len, data_addr, sizeof(*data_addr)));
 170 }
 171
 172 static int daemon_set_mtu(int mtu, void *data)
 173 {
 174         return(mtu);
 175 }
 176
 177 struct net_user_info daemon_user_info = {
 178         .init           = daemon_user_init,
 179         .open           = daemon_open,
 180         .close          = NULL,
 181         .remove         = daemon_remove,
 182         .set_mtu        = daemon_set_mtu,
 183         .add_address    = NULL,
 184         .delete_address = NULL,
 185         .max_packet     = MAX_PACKET - ETH_HEADER_OTHER
 186 };
 187
 188 /*
 189  * Overrides for Emacs so that we follow Linus's tabbing style.
 190  * Emacs will notice this stuff at the end of the file and automatically
 191  * adjust the settings for this buffer only.  This must remain at the end
 192  * of the file.
 193  * ---------------------------------------------------------------------------
 194  * Local variables:
 195  * c-file-style: "linux"
 196  * End:
 197  */