/* * Hub net client * * Copyright IBM, Corp. 2012 * * Authors: * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> * Zhi Yong Wu <wuzhy@linux.vnet.ibm.com> * * This work is licensed under the terms of the GNU LGPL, version 2 or later. * See the COPYING.LIB file in the top-level directory. * */ #include "monitor/monitor.h" #include "net/net.h" #include "clients.h" #include "hub.h" #include "qemu/iov.h" /* * A hub broadcasts incoming packets to all its ports except the source port. * Hubs can be used to provide independent network segments, also confusingly * named the QEMU 'vlan' feature. */ typedef struct NetHub NetHub; typedef struct NetHubPort { NetClientState nc; QLIST_ENTRY(NetHubPort) next; NetHub *hub; int id; } NetHubPort; struct NetHub { int id; QLIST_ENTRY(NetHub) next; int num_ports; QLIST_HEAD(, NetHubPort) ports; }; static QLIST_HEAD(, NetHub) hubs = QLIST_HEAD_INITIALIZER(&hubs); static ssize_t net_hub_receive(NetHub *hub, NetHubPort *source_port, const uint8_t *buf, size_t len) { NetHubPort *port; QLIST_FOREACH(port, &hub->ports, next) { if (port == source_port) { continue; } qemu_send_packet(&port->nc, buf, len); } return len; } static ssize_t net_hub_receive_iov(NetHub *hub, NetHubPort *source_port, const struct iovec *iov, int iovcnt) { NetHubPort *port; ssize_t len = iov_size(iov, iovcnt); QLIST_FOREACH(port, &hub->ports, next) { if (port == source_port) { continue; } qemu_sendv_packet(&port->nc, iov, iovcnt); } return len; } static NetHub *net_hub_new(int id) { NetHub *hub; hub = g_malloc(sizeof(*hub)); hub->id = id; hub->num_ports = 0; QLIST_INIT(&hub->ports); QLIST_INSERT_HEAD(&hubs, hub, next); return hub; } static int net_hub_port_can_receive(NetClientState *nc) { NetHubPort *port; NetHubPort *src_port = DO_UPCAST(NetHubPort, nc, nc); NetHub *hub = src_port->hub; QLIST_FOREACH(port, &hub->ports, next) { if (port == src_port) { continue; } if (qemu_can_send_packet(&port->nc)) { return 1; } } return 0; } static ssize_t net_hub_port_receive(NetClientState *nc, const uint8_t *buf, size_t len) { NetHubPort *port = DO_UPCAST(NetHubPort, nc, nc); return net_hub_receive(port->hub, port, buf, len); } static ssize_t net_hub_port_receive_iov(NetClientState *nc, const struct iovec *iov, int iovcnt) { NetHubPort *port = DO_UPCAST(NetHubPort, nc, nc); return net_hub_receive_iov(port->hub, port, iov, iovcnt); } static void net_hub_port_cleanup(NetClientState *nc) { NetHubPort *port = DO_UPCAST(NetHubPort, nc, nc); QLIST_REMOVE(port, next); } static NetClientInfo net_hub_port_info = { .type = NET_CLIENT_OPTIONS_KIND_HUBPORT, .size = sizeof(NetHubPort), .can_receive = net_hub_port_can_receive, .receive = net_hub_port_receive, .receive_iov = net_hub_port_receive_iov, .cleanup = net_hub_port_cleanup, }; static NetHubPort *net_hub_port_new(NetHub *hub, const char *name) { NetClientState *nc; NetHubPort *port; int id = hub->num_ports++; char default_name[128]; if (!name) { snprintf(default_name, sizeof(default_name), "hub%dport%d", hub->id, id); name = default_name; } nc = qemu_new_net_client(&net_hub_port_info, NULL, "hub", name); port = DO_UPCAST(NetHubPort, nc, nc); port->id = id; port->hub = hub; QLIST_INSERT_HEAD(&hub->ports, port, next); return port; } /** * Create a port on a given hub * @name: Net client name or NULL for default name. * * If there is no existing hub with the given id then a new hub is created. */ NetClientState *net_hub_add_port(int hub_id, const char *name) { NetHub *hub; NetHubPort *port; QLIST_FOREACH(hub, &hubs, next) { if (hub->id == hub_id) { break; } } if (!hub) { hub = net_hub_new(hub_id); } port = net_hub_port_new(hub, name); return &port->nc; } /** * Find a specific client on a hub */ NetClientState *net_hub_find_client_by_name(int hub_id, const char *name) { NetHub *hub; NetHubPort *port; NetClientState *peer; QLIST_FOREACH(hub, &hubs, next) { if (hub->id == hub_id) { QLIST_FOREACH(port, &hub->ports, next) { peer = port->nc.peer; if (peer && strcmp(peer->name, name) == 0) { return peer; } } } } return NULL; } /** * Find a available port on a hub; otherwise create one new port */ NetClientState *net_hub_port_find(int hub_id) { NetHub *hub; NetHubPort *port; NetClientState *nc; QLIST_FOREACH(hub, &hubs, next) { if (hub->id == hub_id) { QLIST_FOREACH(port, &hub->ports, next) { nc = port->nc.peer; if (!nc) { return &(port->nc); } } break; } } nc = net_hub_add_port(hub_id, NULL); return nc; } /** * Print hub configuration */ void net_hub_info(Monitor *mon) { NetHub *hub; NetHubPort *port; QLIST_FOREACH(hub, &hubs, next) { monitor_printf(mon, "hub %d\n", hub->id); QLIST_FOREACH(port, &hub->ports, next) { if (port->nc.peer) { monitor_printf(mon, " \\ "); print_net_client(mon, port->nc.peer); } } } } /** * Get the hub id that a client is connected to * * @id: Pointer for hub id output, may be NULL */ int net_hub_id_for_client(NetClientState *nc, int *id) { NetHubPort *port; if (nc->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) { port = DO_UPCAST(NetHubPort, nc, nc); } else if (nc->peer != NULL && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) { port = DO_UPCAST(NetHubPort, nc, nc->peer); } else { return -ENOENT; } if (id) { *id = port->hub->id; } return 0; } int net_init_hubport(const NetClientOptions *opts, const char *name, NetClientState *peer) { const NetdevHubPortOptions *hubport; assert(opts->kind == NET_CLIENT_OPTIONS_KIND_HUBPORT); hubport = opts->hubport; /* Treat hub port like a backend, NIC must be the one to peer */ if (peer) { return -EINVAL; } net_hub_add_port(hubport->hubid, name); return 0; } /** * Warn if hub configurations are likely wrong */ void net_hub_check_clients(void) { NetHub *hub; NetHubPort *port; NetClientState *peer; QLIST_FOREACH(hub, &hubs, next) { int has_nic = 0, has_host_dev = 0; QLIST_FOREACH(port, &hub->ports, next) { peer = port->nc.peer; if (!peer) { fprintf(stderr, "Warning: hub port %s has no peer\n", port->nc.name); continue; } switch (peer->info->type) { case NET_CLIENT_OPTIONS_KIND_NIC: has_nic = 1; break; case NET_CLIENT_OPTIONS_KIND_USER: case NET_CLIENT_OPTIONS_KIND_TAP: case NET_CLIENT_OPTIONS_KIND_SOCKET: case NET_CLIENT_OPTIONS_KIND_VDE: has_host_dev = 1; break; default: break; } } if (has_host_dev && !has_nic) { fprintf(stderr, "Warning: vlan %d with no nics\n", hub->id); } if (has_nic && !has_host_dev) { fprintf(stderr, "Warning: vlan %d is not connected to host network\n", hub->id); } } }