palacios/src/devices/nic_bridge.c

   1 /*
   2  * This file is part of the Palacios Virtual Machine Monitor developed
   3  * by the V3VEE Project with funding from the United States National
   4  * Science Foundation and the Department of Energy.
   5  *
   6  * The V3VEE Project is a joint project between Northwestern University
   7  * and the University of New Mexico.  You can find out more at
   8  * http://www.v3vee.org
   9  *
  10  * Copyright (c) 2010, Lei Xia <lxia@northwestern.edu>
  11  * Copyright (c) 2010, The V3VEE Project <http://www.v3vee.org>
  12  * All rights reserved.
  13  *
  14  * Author: Lei Xia <lxia@northwestern.edu>
  15  *
  16  *
  17  * This is free software.  You are permitted to use,
  18  * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
  19  */
  20 //backend device for Virtio NIC, Direct Network Bridge
  21
  22 #include <palacios/vmm.h>
  23 #include <palacios/vmm_dev_mgr.h>
  24 #include <palacios/vm_guest_mem.h>
  25 #include <palacios/vmm_sprintf.h>
  26 #include <interfaces/vmm_packet.h>
  27
  28 #ifndef V3_CONFIG_DEBUG_NIC_BRIDGE
  29 #undef PrintDebug
  30 #define PrintDebug(fmt, args...)
  31 #endif
  32
  33 struct nic_bridge_state {
  34     struct v3_vm_info * vm;
  35     struct v3_dev_net_ops net_ops;
  36     struct v3_packet * packet_state;
  37 };
  38
  39 static int bridge_send(uint8_t * buf, uint32_t len,
  40                        void * private_data) {
  41     struct nic_bridge_state * bridge = (struct nic_bridge_state *)private_data;
  42
  43 #ifdef V3_CONFIG_DEBUG_NIC_BRIDGE
  44     {
  45         PrintDebug(VM_NONE, VCORE_NONE, "NIC Bridge: send pkt size: %d\n", len);
  46         v3_hexdump(buf, len, NULL, 0);
  47     }
  48 #endif
  49
  50     return v3_packet_send(bridge->packet_state, buf, len);
  51 }
  52
  53 static int packet_input(struct v3_packet * packet_state, uint8_t * pkt, uint32_t size) {
  54     struct nic_bridge_state * bridge = (struct nic_bridge_state *)packet_state->guest_packet_data;
  55
  56 #ifdef V3_CONFIG_DEBUG_NIC_BRIDGE
  57     {
  58         PrintDebug(VM_NONE, VCORE_NONE, "NIC Bridge: recv pkt size: %d\n", size);
  59         v3_hexdump(pkt, size, NULL, 0);
  60     }
  61 #endif
  62
  63     return bridge->net_ops.recv(pkt,
  64                                 size,
  65                                 bridge->net_ops.config.frontend_data);
  66 }
  67
  68
  69 static int nic_bridge_free(struct nic_bridge_state * bridge) {
  70     /*TODO: detach from front device */
  71
  72     v3_packet_close(bridge->packet_state);
  73     V3_Free(bridge);
  74
  75     return 0;
  76 }
  77
  78 static struct v3_device_ops dev_ops = {
  79     .free = (int (*)(void *))nic_bridge_free,
  80
  81 };
  82
  83 static int nic_bridge_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
  84     struct nic_bridge_state * bridge = NULL;
  85     char * dev_id = v3_cfg_val(cfg, "ID");
  86     char * host_nic;
  87
  88     v3_cfg_tree_t * frontend_cfg = v3_cfg_subtree(cfg, "frontend");
  89
  90     v3_cfg_tree_t * hostnic_cfg = v3_cfg_subtree(cfg, "hostnic");
  91     host_nic = v3_cfg_val(hostnic_cfg, "name");
  92     if(host_nic == NULL) {
  93         host_nic = "eth0";
  94     }
  95
  96     bridge = (struct nic_bridge_state *)V3_Malloc(sizeof(struct nic_bridge_state));
  97
  98     if (!bridge) {
  99         PrintError(vm, VCORE_NONE, "Cannot allocate in init\n");
 100         return -1;
 101     }
 102
 103     memset(bridge, 0, sizeof(struct nic_bridge_state));
 104
 105     struct vm_device * dev = v3_add_device(vm, dev_id, &dev_ops, bridge);
 106
 107     if (dev == NULL) {
 108         PrintError(vm, VCORE_NONE, "Could not attach device %s\n", dev_id);
 109         V3_Free(bridge);
 110         return -1;
 111     }
 112
 113     bridge->net_ops.send = bridge_send;
 114     bridge->vm = vm;
 115
 116     if (v3_dev_connect_net(vm, v3_cfg_val(frontend_cfg, "tag"),
 117                            &(bridge->net_ops), frontend_cfg, bridge) == -1) {
 118         PrintError(vm, VCORE_NONE, "Could not connect %s to frontend %s\n",
 119                    dev_id, v3_cfg_val(frontend_cfg, "tag"));
 120         v3_remove_device(dev);
 121         return -1;
 122     }
 123
 124     PrintDebug(vm, VCORE_NONE, "NIC-Bridge: Connect %s to frontend %s\n",
 125                dev_id, v3_cfg_val(frontend_cfg, "tag"));
 126
 127     bridge->packet_state = v3_packet_connect(vm, host_nic,
 128                                              bridge->net_ops.config.fnt_mac,
 129                                              packet_input,
 130                                              (void *)bridge);
 131
 132     if(bridge->packet_state == NULL){
 133         PrintError(vm, VCORE_NONE, "NIC-Bridge: Error to connect to host ethernet device\n");
 134         return -1;
 135     }
 136
 137     return 0;
 138 }
 139
 140 device_register("NIC_BRIDGE", nic_bridge_init)