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 #include "um_malloc.h"
  21
  22 #define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER)
  23
  24 enum request_type { REQ_NEW_CONTROL };
  25
  26 #define SWITCH_MAGIC 0xfeedface
  27
  28 struct request_v3 {
  29         uint32_t magic;
  30         uint32_t version;
  31         enum request_type type;
  32         struct sockaddr_un sock;
  33 };
  34
  35 static struct sockaddr_un *new_addr(void *name, int len)
  36 {
  37         struct sockaddr_un *sun;
  38
  39         sun = um_kmalloc(sizeof(struct sockaddr_un));
  40         if(sun == NULL){
  41                 printk("new_addr: allocation of sockaddr_un failed\n");
  42                 return(NULL);
  43         }
  44         sun->sun_family = AF_UNIX;
  45         memcpy(sun->sun_path, name, len);
  46         return(sun);
  47 }
  48
  49 static int connect_to_switch(struct daemon_data *pri)
  50 {
  51         struct sockaddr_un *ctl_addr = pri->ctl_addr;
  52         struct sockaddr_un *local_addr = pri->local_addr;
  53         struct sockaddr_un *sun;
  54         struct request_v3 req;
  55         int fd, n, err;
  56
  57         pri->control = socket(AF_UNIX, SOCK_STREAM, 0);
  58         if(pri->control < 0){
  59                 printk("daemon_open : control socket failed, errno = %d\n",
  60                        errno);
  61                 return(-errno);
  62         }
  63
  64         if(connect(pri->control, (struct sockaddr *) ctl_addr,
  65                    sizeof(*ctl_addr)) < 0){
  66                 printk("daemon_open : control connect failed, errno = %d\n",
  67                        errno);
  68                 err = -errno;
  69                 goto out;
  70         }
  71
  72         fd = socket(AF_UNIX, SOCK_DGRAM, 0);
  73         if(fd < 0){
  74                 printk("daemon_open : data socket failed, errno = %d\n",
  75                        errno);
  76                 err = -errno;
  77                 goto out;
  78         }
  79         if(bind(fd, (struct sockaddr *) local_addr, sizeof(*local_addr)) < 0){
  80                 printk("daemon_open : data bind failed, errno = %d\n",
  81                        errno);
  82                 err = -errno;
  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 void 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         }
 149 }
 150
 151 static int daemon_open(void *data)
 152 {
 153         struct daemon_data *pri = data;
 154         return(pri->fd);
 155 }
 156
 157 static void daemon_remove(void *data)
 158 {
 159         struct daemon_data *pri = data;
 160
 161         os_close_file(pri->fd);
 162         pri->fd = -1;
 163         os_close_file(pri->control);
 164         pri->control = -1;
 165
 166         kfree(pri->data_addr);
 167         pri->data_addr = NULL;
 168         kfree(pri->ctl_addr);
 169         pri->ctl_addr = NULL;
 170         kfree(pri->local_addr);
 171         pri->local_addr = NULL;
 172 }
 173
 174 int daemon_user_write(int fd, void *buf, int len, struct daemon_data *pri)
 175 {
 176         struct sockaddr_un *data_addr = pri->data_addr;
 177
 178         return(net_sendto(fd, buf, len, data_addr, sizeof(*data_addr)));
 179 }
 180
 181 static int daemon_set_mtu(int mtu, void *data)
 182 {
 183         return(mtu);
 184 }
 185
 186 const struct net_user_info daemon_user_info = {
 187         .init           = daemon_user_init,
 188         .open           = daemon_open,
 189         .close          = NULL,
 190         .remove         = daemon_remove,
 191         .set_mtu        = daemon_set_mtu,
 192         .add_address    = NULL,
 193         .delete_address = NULL,
 194         .max_packet     = MAX_PACKET - ETH_HEADER_OTHER
 195 };
 196
 197 /*
 198  * Overrides for Emacs so that we follow Linus's tabbing style.
 199  * Emacs will notice this stuff at the end of the file and automatically
 200  * adjust the settings for this buffer only.  This must remain at the end
 201  * of the file.
 202  * ---------------------------------------------------------------------------
 203  * Local variables:
 204  * c-file-style: "linux"
 205  * End:
 206  */