arch/um/drivers/vde_user.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org).
   4  */
   5
   6 #include <stddef.h>
   7 #include <errno.h>
   8 #include <libvdeplug.h>
   9 #include <net_user.h>
  10 #include <um_malloc.h>
  11 #include "vde.h"
  12
  13 static int vde_user_init(void *data, void *dev)
  14 {
  15         struct vde_data *pri = data;
  16         VDECONN *conn = NULL;
  17         int err = -EINVAL;
  18
  19         pri->dev = dev;
  20
  21         conn = vde_open(pri->vde_switch, pri->descr, pri->args);
  22
  23         if (conn == NULL) {
  24                 err = -errno;
  25                 printk(UM_KERN_ERR "vde_user_init: vde_open failed, "
  26                        "errno = %d\n", errno);
  27                 return err;
  28         }
  29
  30         printk(UM_KERN_INFO "vde backend - connection opened\n");
  31
  32         pri->conn = conn;
  33
  34         return 0;
  35 }
  36
  37 static int vde_user_open(void *data)
  38 {
  39         struct vde_data *pri = data;
  40
  41         if (pri->conn != NULL)
  42                 return vde_datafd(pri->conn);
  43
  44         printk(UM_KERN_WARNING "vde_open - we have no VDECONN to open");
  45         return -EINVAL;
  46 }
  47
  48 static void vde_remove(void *data)
  49 {
  50         struct vde_data *pri = data;
  51
  52         if (pri->conn != NULL) {
  53                 printk(UM_KERN_INFO "vde backend - closing connection\n");
  54                 vde_close(pri->conn);
  55                 pri->conn = NULL;
  56                 kfree(pri->args);
  57                 pri->args = NULL;
  58                 return;
  59         }
  60
  61         printk(UM_KERN_WARNING "vde_remove - we have no VDECONN to remove");
  62 }
  63
  64 const struct net_user_info vde_user_info = {
  65         .init           = vde_user_init,
  66         .open           = vde_user_open,
  67         .close          = NULL,
  68         .remove         = vde_remove,
  69         .add_address    = NULL,
  70         .delete_address = NULL,
  71         .mtu            = ETH_MAX_PACKET,
  72         .max_packet     = ETH_MAX_PACKET + ETH_HEADER_OTHER,
  73 };
  74
  75 void vde_init_libstuff(struct vde_data *vpri, struct vde_init *init)
  76 {
  77         struct vde_open_args *args;
  78
  79         vpri->args = uml_kmalloc(sizeof(struct vde_open_args), UM_GFP_KERNEL);
  80         if (vpri->args == NULL) {
  81                 printk(UM_KERN_ERR "vde_init_libstuff - vde_open_args "
  82                        "allocation failed");
  83                 return;
  84         }
  85
  86         args = vpri->args;
  87
  88         args->port = init->port;
  89         args->group = init->group;
  90         args->mode = init->mode ? init->mode : 0700;
  91
  92         args->port ?  printk("port %d", args->port) :
  93                 printk("undefined port");
  94 }
  95
  96 int vde_user_read(void *conn, void *buf, int len)
  97 {
  98         VDECONN *vconn = conn;
  99         int rv;
 100
 101         if (vconn == NULL)
 102                 return 0;
 103
 104         rv = vde_recv(vconn, buf, len, 0);
 105         if (rv < 0) {
 106                 if (errno == EAGAIN)
 107                         return 0;
 108                 return -errno;
 109         }
 110         else if (rv == 0)
 111                 return -ENOTCONN;
 112
 113         return rv;
 114 }
 115
 116 int vde_user_write(void *conn, void *buf, int len)
 117 {
 118         VDECONN *vconn = conn;
 119
 120         if (vconn == NULL)
 121                 return 0;
 122
 123         return vde_send(vconn, buf, len, 0);
 124 }
 125