1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org). 4 * 5 * Transport usage: 6 * ethN=vde,<vde_switch>,<mac addr>,<port>,<group>,<mode>,<description> 7 * 8 */ 9 10 #include <linux/init.h> 11 #include <linux/netdevice.h> 12 #include <net_kern.h> 13 #include <net_user.h> 14 #include "vde.h" 15 16 static void vde_init(struct net_device *dev, void *data) 17 { 18 struct vde_init *init = data; 19 struct uml_net_private *pri; 20 struct vde_data *vpri; 21 22 pri = netdev_priv(dev); 23 vpri = (struct vde_data *) pri->user; 24 25 vpri->vde_switch = init->vde_switch; 26 vpri->descr = init->descr ? init->descr : "UML vde_transport"; 27 vpri->args = NULL; 28 vpri->conn = NULL; 29 vpri->dev = dev; 30 31 printk("vde backend - %s, ", vpri->vde_switch ? 32 vpri->vde_switch : "(default socket)"); 33 34 vde_init_libstuff(vpri, init); 35 36 printk("\n"); 37 } 38 39 static int vde_read(int fd, struct sk_buff *skb, struct uml_net_private *lp) 40 { 41 struct vde_data *pri = (struct vde_data *) &lp->user; 42 43 if (pri->conn != NULL) 44 return vde_user_read(pri->conn, skb_mac_header(skb), 45 skb->dev->mtu + ETH_HEADER_OTHER); 46 47 printk(KERN_ERR "vde_read - we have no VDECONN to read from"); 48 return -EBADF; 49 } 50 51 static int vde_write(int fd, struct sk_buff *skb, struct uml_net_private *lp) 52 { 53 struct vde_data *pri = (struct vde_data *) &lp->user; 54 55 if (pri->conn != NULL) 56 return vde_user_write((void *)pri->conn, skb->data, 57 skb->len); 58 59 printk(KERN_ERR "vde_write - we have no VDECONN to write to"); 60 return -EBADF; 61 } 62 63 static const struct net_kern_info vde_kern_info = { 64 .init = vde_init, 65 .protocol = eth_protocol, 66 .read = vde_read, 67 .write = vde_write, 68 }; 69 70 static int vde_setup(char *str, char **mac_out, void *data) 71 { 72 struct vde_init *init = data; 73 char *remain, *port_str = NULL, *mode_str = NULL, *last; 74 75 *init = ((struct vde_init) 76 { .vde_switch = NULL, 77 .descr = NULL, 78 .port = 0, 79 .group = NULL, 80 .mode = 0 }); 81 82 remain = split_if_spec(str, &init->vde_switch, mac_out, &port_str, 83 &init->group, &mode_str, &init->descr, NULL); 84 85 if (remain != NULL) 86 printk(KERN_WARNING "vde_setup - Ignoring extra data :" 87 "'%s'\n", remain); 88 89 if (port_str != NULL) { 90 init->port = simple_strtoul(port_str, &last, 10); 91 if ((*last != '\0') || (last == port_str)) { 92 printk(KERN_ERR "vde_setup - Bad port : '%s'\n", 93 port_str); 94 return 0; 95 } 96 } 97 98 if (mode_str != NULL) { 99 init->mode = simple_strtoul(mode_str, &last, 8); 100 if ((*last != '\0') || (last == mode_str)) { 101 printk(KERN_ERR "vde_setup - Bad mode : '%s'\n", 102 mode_str); 103 return 0; 104 } 105 } 106 107 printk(KERN_INFO "Configured vde device: %s\n", init->vde_switch ? 108 init->vde_switch : "(default socket)"); 109 110 return 1; 111 } 112 113 static struct transport vde_transport = { 114 .list = LIST_HEAD_INIT(vde_transport.list), 115 .name = "vde", 116 .setup = vde_setup, 117 .user = &vde_user_info, 118 .kern = &vde_kern_info, 119 .private_size = sizeof(struct vde_data), 120 .setup_size = sizeof(struct vde_init), 121 }; 122 123 static int register_vde(void) 124 { 125 register_transport(&vde_transport); 126 return 0; 127 } 128 129 late_initcall(register_vde); 130