/* Copyright (c) 2008, 2009 Nicira Networks * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include #include "bridge.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "bitmap.h" #include "cfg.h" #include "coverage.h" #include "dirs.h" #include "dpif.h" #include "dynamic-string.h" #include "flow.h" #include "hash.h" #include "list.h" #include "mac-learning.h" #include "netdev.h" #include "odp-util.h" #include "ofp-print.h" #include "ofpbuf.h" #include "ofproto/netflow.h" #include "ofproto/ofproto.h" #include "packets.h" #include "poll-loop.h" #include "port-array.h" #include "proc-net-compat.h" #include "process.h" #include "shash.h" #include "socket-util.h" #include "stp.h" #include "svec.h" #include "timeval.h" #include "util.h" #include "unixctl.h" #include "vconn.h" #include "vconn-ssl.h" #include "xenserver.h" #include "xtoxll.h" #include "sflow_api.h" #define THIS_MODULE VLM_bridge #include "vlog.h" struct dst { uint16_t vlan; uint16_t dp_ifidx; }; extern uint64_t mgmt_id; struct iface { /* These members are always valid. */ struct port *port; /* Containing port. */ size_t port_ifidx; /* Index within containing port. */ char *name; /* Host network device name. */ tag_type tag; /* Tag associated with this interface. */ long long delay_expires; /* Time after which 'enabled' may change. */ /* These members are valid only after bridge_reconfigure() causes them to * be initialized.*/ int dp_ifidx; /* Index within kernel datapath. */ struct netdev *netdev; /* Network device. */ bool enabled; /* May be chosen for flows? */ }; #define BOND_MASK 0xff struct bond_entry { int iface_idx; /* Index of assigned iface, or -1 if none. */ uint64_t tx_bytes; /* Count of bytes recently transmitted. */ tag_type iface_tag; /* Tag associated with iface_idx. */ }; #define MAX_MIRRORS 32 typedef uint32_t mirror_mask_t; #define MIRROR_MASK_C(X) UINT32_C(X) BUILD_ASSERT_DECL(sizeof(mirror_mask_t) * CHAR_BIT >= MAX_MIRRORS); struct mirror { struct bridge *bridge; size_t idx; char *name; /* Selection criteria. */ struct svec src_ports; struct svec dst_ports; int *vlans; size_t n_vlans; /* Output. */ struct port *out_port; int out_vlan; }; #define FLOOD_PORT ((struct port *) 1) /* The 'flood' output port. */ struct port { struct bridge *bridge; size_t port_idx; int vlan; /* -1=trunk port, else a 12-bit VLAN ID. */ unsigned long *trunks; /* Bitmap of trunked VLANs, if 'vlan' == -1. */ char *name; /* An ordinary bridge port has 1 interface. * A bridge port for bonding has at least 2 interfaces. */ struct iface **ifaces; size_t n_ifaces, allocated_ifaces; /* Bonding info. */ struct bond_entry *bond_hash; /* An array of (BOND_MASK + 1) elements. */ int active_iface; /* Ifidx on which bcasts accepted, or -1. */ tag_type active_iface_tag; /* Tag for bcast flows. */ tag_type no_ifaces_tag; /* Tag for flows when all ifaces disabled. */ int updelay, downdelay; /* Delay before iface goes up/down, in ms. */ bool bond_compat_is_stale; /* Need to call port_update_bond_compat()? */ /* Port mirroring info. */ mirror_mask_t src_mirrors; /* Mirrors triggered when packet received. */ mirror_mask_t dst_mirrors; /* Mirrors triggered when packet sent. */ bool is_mirror_output_port; /* Does port mirroring send frames here? */ /* Spanning tree info. */ enum stp_state stp_state; /* Always STP_FORWARDING if STP not in use. */ tag_type stp_state_tag; /* Tag for STP state change. */ }; #define DP_MAX_PORTS 255 struct bridge { struct list node; /* Node in global list of bridges. */ char *name; /* User-specified arbitrary name. */ struct mac_learning *ml; /* MAC learning table. */ bool sent_config_request; /* Successfully sent config request? */ uint8_t default_ea[ETH_ADDR_LEN]; /* Default MAC. */ /* Support for remote controllers. */ char *controller; /* NULL if there is no remote controller; * "discover" to do controller discovery; * otherwise a vconn name. */ /* OpenFlow switch processing. */ struct ofproto *ofproto; /* OpenFlow switch. */ /* Kernel datapath information. */ struct dpif *dpif; /* Datapath. */ struct port_array ifaces; /* Indexed by kernel datapath port number. */ /* Bridge ports. */ struct port **ports; size_t n_ports, allocated_ports; /* Bonding. */ bool has_bonded_ports; long long int bond_next_rebalance; /* Flow tracking. */ bool flush; /* Flow statistics gathering. */ time_t next_stats_request; /* Port mirroring. */ struct mirror *mirrors[MAX_MIRRORS]; /* Spanning tree. */ struct stp *stp; long long int stp_last_tick; }; /* List of all bridges. */ static struct list all_bridges = LIST_INITIALIZER(&all_bridges); /* Maximum number of datapaths. */ enum { DP_MAX = 256 }; static struct bridge *bridge_create(const char *name); static void bridge_destroy(struct bridge *); static struct bridge *bridge_lookup(const char *name); static void bridge_unixctl_dump_flows(struct unixctl_conn *, const char *); static int bridge_run_one(struct bridge *); static void bridge_reconfigure_one(struct bridge *); static void bridge_reconfigure_controller(struct bridge *); static void bridge_get_all_ifaces(const struct bridge *, struct svec *ifaces); static void bridge_fetch_dp_ifaces(struct bridge *); static void bridge_flush(struct bridge *); static void bridge_pick_local_hw_addr(struct bridge *, uint8_t ea[ETH_ADDR_LEN], struct iface **hw_addr_iface); static uint64_t bridge_pick_datapath_id(struct bridge *, const uint8_t bridge_ea[ETH_ADDR_LEN], struct iface *hw_addr_iface); static struct iface *bridge_get_local_iface(struct bridge *); static const char *bridge_get_controller(const struct bridge *br); static uint64_t dpid_from_hash(const void *, size_t nbytes); static void bridge_unixctl_fdb_show(struct unixctl_conn *, const char *args); static void bond_init(void); static void bond_run(struct bridge *); static void bond_wait(struct bridge *); static void bond_rebalance_port(struct port *); static void bond_send_learning_packets(struct port *); static void bond_enable_slave(struct iface *iface, bool enable); static void port_create(struct bridge *, const char *name); static void port_reconfigure(struct port *); static void port_destroy(struct port *); static struct port *port_lookup(const struct bridge *, const char *name); static struct iface *port_lookup_iface(const struct port *, const char *name); static struct port *port_from_dp_ifidx(const struct bridge *, uint16_t dp_ifidx); static void port_update_bond_compat(struct port *); static void port_update_vlan_compat(struct port *); static void port_update_bonding(struct port *); static void mirror_create(struct bridge *, const char *name); static void mirror_destroy(struct mirror *); static void mirror_reconfigure(struct bridge *); static void mirror_reconfigure_one(struct mirror *); static bool vlan_is_mirrored(const struct mirror *, int vlan); static void brstp_reconfigure(struct bridge *); static void brstp_adjust_timers(struct bridge *); static void brstp_run(struct bridge *); static void brstp_wait(struct bridge *); static void iface_create(struct port *, const char *name); static void iface_destroy(struct iface *); static struct iface *iface_lookup(const struct bridge *, const char *name); static struct iface *iface_from_dp_ifidx(const struct bridge *, uint16_t dp_ifidx); static bool iface_is_internal(const struct bridge *, const char *name); static void iface_set_mac(struct iface *); /* Hooks into ofproto processing. */ static struct ofhooks bridge_ofhooks; /* Public functions. */ /* Adds the name of each interface used by a bridge, including local and * internal ports, to 'svec'. */ void bridge_get_ifaces(struct svec *svec) { struct bridge *br, *next; size_t i, j; LIST_FOR_EACH_SAFE (br, next, struct bridge, node, &all_bridges) { for (i = 0; i < br->n_ports; i++) { struct port *port = br->ports[i]; for (j = 0; j < port->n_ifaces; j++) { struct iface *iface = port->ifaces[j]; if (iface->dp_ifidx < 0) { VLOG_ERR("%s interface not in datapath %s, ignoring", iface->name, dpif_name(br->dpif)); } else { if (iface->dp_ifidx != ODPP_LOCAL) { svec_add(svec, iface->name); } } } } } } /* The caller must already have called cfg_read(). */ void bridge_init(void) { struct svec dpif_names; size_t i; unixctl_command_register("fdb/show", bridge_unixctl_fdb_show); svec_init(&dpif_names); dp_enumerate(&dpif_names); for (i = 0; i < dpif_names.n; i++) { const char *dpif_name = dpif_names.names[i]; struct dpif *dpif; int retval; retval = dpif_open(dpif_name, &dpif); if (!retval) { struct svec all_names; size_t j; svec_init(&all_names); dpif_get_all_names(dpif, &all_names); for (j = 0; j < all_names.n; j++) { if (cfg_has("bridge.%s.port", all_names.names[j])) { goto found; } } dpif_delete(dpif); found: svec_destroy(&all_names); dpif_close(dpif); } } svec_destroy(&dpif_names); unixctl_command_register("bridge/dump-flows", bridge_unixctl_dump_flows); bond_init(); bridge_reconfigure(); } #ifdef HAVE_OPENSSL static bool config_string_change(const char *key, char **valuep) { const char *value = cfg_get_string(0, "%s", key); if (value && (!*valuep || strcmp(value, *valuep))) { free(*valuep); *valuep = xstrdup(value); return true; } else { return false; } } static void bridge_configure_ssl(void) { /* XXX SSL should be configurable on a per-bridge basis. * XXX should be possible to de-configure SSL. */ static char *private_key_file; static char *certificate_file; static char *cacert_file; struct stat s; if (config_string_change("ssl.private-key", &private_key_file)) { vconn_ssl_set_private_key_file(private_key_file); } if (config_string_change("ssl.certificate", &certificate_file)) { vconn_ssl_set_certificate_file(certificate_file); } /* We assume that even if the filename hasn't changed, if the CA cert * file has been removed, that we want to move back into * boot-strapping mode. This opens a small security hole, because * the old certificate will still be trusted until vSwitch is * restarted. We may want to address this in vconn's SSL library. */ if (config_string_change("ssl.ca-cert", &cacert_file) || (cacert_file && stat(cacert_file, &s) && errno == ENOENT)) { vconn_ssl_set_ca_cert_file(cacert_file, cfg_get_bool(0, "ssl.bootstrap-ca-cert")); } } #endif /* Attempt to create the network device 'iface_name' through the netdev * library. */ static int set_up_iface(const char *iface_name, bool create) { const char *type; const char *arg; struct svec arg_svec; struct shash args; int error; size_t i; /* If a type is not explicitly declared, then assume it's an existing * "system" device. */ type = cfg_get_string(0, "iface.%s.type", iface_name); if (!type || !strcmp(type, "system")) { return 0; } svec_init(&arg_svec); cfg_get_subsections(&arg_svec, "iface.%s.args", iface_name); shash_init(&args); SVEC_FOR_EACH (i, arg, &arg_svec) { const char *value; value = cfg_get_string(0, "iface.%s.args.%s", iface_name, arg); if (value) { shash_add(&args, arg, xstrdup(value)); } } if (create) { error = netdev_create(iface_name, type, &args); } else { /* xxx Check to make sure that the type hasn't changed. */ error = netdev_reconfigure(iface_name, &args); } svec_destroy(&arg_svec); shash_destroy(&args); return error; } static int create_iface(const char *iface_name) { return set_up_iface(iface_name, true); } static int reconfigure_iface(const char *iface_name) { return set_up_iface(iface_name, false); } static void destroy_iface(const char *iface_name) { netdev_destroy(iface_name); } /* iterate_and_prune_ifaces() callback function that opens the network device * for 'iface', if it is not already open, and retrieves the interface's MAC * address and carrier status. */ static bool init_iface_netdev(struct bridge *br UNUSED, struct iface *iface, void *aux UNUSED) { if (iface->netdev) { return true; } else if (!netdev_open(iface->name, NETDEV_ETH_TYPE_NONE, &iface->netdev)) { netdev_get_carrier(iface->netdev, &iface->enabled); return true; } else { /* If the network device can't be opened, then we're not going to try * to do anything with this interface. */ return false; } } static bool check_iface_dp_ifidx(struct bridge *br, struct iface *iface, void *aux UNUSED) { if (iface->dp_ifidx >= 0) { VLOG_DBG("%s has interface %s on port %d", dpif_name(br->dpif), iface->name, iface->dp_ifidx); return true; } else { VLOG_ERR("%s interface not in %s, dropping", iface->name, dpif_name(br->dpif)); return false; } } static bool set_iface_properties(struct bridge *br UNUSED, struct iface *iface, void *aux UNUSED) { int rate, burst; /* Set policing attributes. */ rate = cfg_get_int(0, "port.%s.ingress.policing-rate", iface->name); burst = cfg_get_int(0, "port.%s.ingress.policing-burst", iface->name); netdev_set_policing(iface->netdev, rate, burst); /* Set MAC address of internal interfaces other than the local * interface. */ if (iface->dp_ifidx != ODPP_LOCAL && iface_is_internal(br, iface->name)) { iface_set_mac(iface); } return true; } /* Calls 'cb' for each interfaces in 'br', passing along the 'aux' argument. * Deletes from 'br' all the interfaces for which 'cb' returns false, and then * deletes from 'br' any ports that no longer have any interfaces. */ static void iterate_and_prune_ifaces(struct bridge *br, bool (*cb)(struct bridge *, struct iface *, void *aux), void *aux) { size_t i, j; for (i = 0; i < br->n_ports; ) { struct port *port = br->ports[i]; for (j = 0; j < port->n_ifaces; ) { struct iface *iface = port->ifaces[j]; if (cb(br, iface, aux)) { j++; } else { iface_destroy(iface); } } if (port->n_ifaces) { i++; } else { VLOG_ERR("%s port has no interfaces, dropping", port->name); port_destroy(port); } } } void bridge_reconfigure(void) { struct svec old_br, new_br; struct bridge *br, *next; size_t i; int sflow_bridge_number; COVERAGE_INC(bridge_reconfigure); /* Collect old and new bridges. */ svec_init(&old_br); svec_init(&new_br); LIST_FOR_EACH (br, struct bridge, node, &all_bridges) { svec_add(&old_br, br->name); } cfg_get_subsections(&new_br, "bridge"); /* Get rid of deleted bridges and add new bridges. */ svec_sort(&old_br); svec_sort(&new_br); assert(svec_is_unique(&old_br)); assert(svec_is_unique(&new_br)); LIST_FOR_EACH_SAFE (br, next, struct bridge, node, &all_bridges) { if (!svec_contains(&new_br, br->name)) { bridge_destroy(br); } } for (i = 0; i < new_br.n; i++) { const char *name = new_br.names[i]; if (!svec_contains(&old_br, name)) { bridge_create(name); } } svec_destroy(&old_br); svec_destroy(&new_br); #ifdef HAVE_OPENSSL /* Configure SSL. */ bridge_configure_ssl(); #endif /* Reconfigure all bridges. */ LIST_FOR_EACH (br, struct bridge, node, &all_bridges) { bridge_reconfigure_one(br); } /* Add and delete ports on all datapaths. * * The kernel will reject any attempt to add a given port to a datapath if * that port already belongs to a different datapath, so we must do all * port deletions before any port additions. */ LIST_FOR_EACH (br, struct bridge, node, &all_bridges) { struct odp_port *dpif_ports; size_t n_dpif_ports; struct svec want_ifaces; dpif_port_list(br->dpif, &dpif_ports, &n_dpif_ports); bridge_get_all_ifaces(br, &want_ifaces); for (i = 0; i < n_dpif_ports; i++) { const struct odp_port *p = &dpif_ports[i]; if (!svec_contains(&want_ifaces, p->devname) && strcmp(p->devname, br->name)) { int retval = dpif_port_del(br->dpif, p->port); if (retval) { VLOG_ERR("failed to remove %s interface from %s: %s", p->devname, dpif_name(br->dpif), strerror(retval)); } destroy_iface(p->devname); } } svec_destroy(&want_ifaces); free(dpif_ports); } LIST_FOR_EACH (br, struct bridge, node, &all_bridges) { struct odp_port *dpif_ports; size_t n_dpif_ports; struct svec cur_ifaces, want_ifaces, add_ifaces; dpif_port_list(br->dpif, &dpif_ports, &n_dpif_ports); svec_init(&cur_ifaces); for (i = 0; i < n_dpif_ports; i++) { svec_add(&cur_ifaces, dpif_ports[i].devname); } free(dpif_ports); svec_sort_unique(&cur_ifaces); bridge_get_all_ifaces(br, &want_ifaces); svec_diff(&want_ifaces, &cur_ifaces, &add_ifaces, NULL, NULL); for (i = 0; i < cur_ifaces.n; i++) { const char *if_name = cur_ifaces.names[i]; reconfigure_iface(if_name); } for (i = 0; i < add_ifaces.n; i++) { const char *if_name = add_ifaces.names[i]; bool internal; int error; /* Attempt to create the network interface in case it * doesn't exist yet. */ error = create_iface(if_name); if (error) { VLOG_WARN("could not create iface %s: %s\n", if_name, strerror(error)); continue; } /* Add to datapath. */ internal = iface_is_internal(br, if_name); error = dpif_port_add(br->dpif, if_name, internal ? ODP_PORT_INTERNAL : 0, NULL); if (error == EFBIG) { VLOG_ERR("ran out of valid port numbers on %s", dpif_name(br->dpif)); break; } else if (error) { VLOG_ERR("failed to add %s interface to %s: %s", if_name, dpif_name(br->dpif), strerror(error)); } } svec_destroy(&cur_ifaces); svec_destroy(&want_ifaces); svec_destroy(&add_ifaces); } sflow_bridge_number = 0; LIST_FOR_EACH (br, struct bridge, node, &all_bridges) { uint8_t ea[8]; uint64_t dpid; struct iface *local_iface; struct iface *hw_addr_iface; struct netflow_options nf_options; bridge_fetch_dp_ifaces(br); iterate_and_prune_ifaces(br, init_iface_netdev, NULL); iterate_and_prune_ifaces(br, check_iface_dp_ifidx, NULL); /* Pick local port hardware address, datapath ID. */ bridge_pick_local_hw_addr(br, ea, &hw_addr_iface); local_iface = bridge_get_local_iface(br); if (local_iface) { int error = netdev_set_etheraddr(local_iface->netdev, ea); if (error) { static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); VLOG_ERR_RL(&rl, "bridge %s: failed to set bridge " "Ethernet address: %s", br->name, strerror(error)); } } dpid = bridge_pick_datapath_id(br, ea, hw_addr_iface); ofproto_set_datapath_id(br->ofproto, dpid); /* Set NetFlow configuration on this bridge. */ memset(&nf_options, 0, sizeof nf_options); dpif_get_netflow_ids(br->dpif, &nf_options.engine_type, &nf_options.engine_id); nf_options.active_timeout = -1; if (cfg_has("netflow.%s.engine-type", br->name)) { nf_options.engine_type = cfg_get_int(0, "netflow.%s.engine-type", br->name); } if (cfg_has("netflow.%s.engine-id", br->name)) { nf_options.engine_id = cfg_get_int(0, "netflow.%s.engine-id", br->name); } if (cfg_has("netflow.%s.active-timeout", br->name)) { nf_options.active_timeout = cfg_get_int(0, "netflow.%s.active-timeout", br->name); } if (cfg_has("netflow.%s.add-id-to-iface", br->name)) { nf_options.add_id_to_iface = cfg_get_bool(0, "netflow.%s.add-id-to-iface", br->name); } if (nf_options.add_id_to_iface && nf_options.engine_id > 0x7f) { VLOG_WARN("bridge %s: netflow port mangling may conflict with " "another vswitch, choose an engine id less than 128", br->name); } if (nf_options.add_id_to_iface && br->n_ports > 508) { VLOG_WARN("bridge %s: netflow port mangling will conflict with " "another port when more than 508 ports are used", br->name); } svec_init(&nf_options.collectors); cfg_get_all_keys(&nf_options.collectors, "netflow.%s.host", br->name); if (ofproto_set_netflow(br->ofproto, &nf_options)) { VLOG_ERR("bridge %s: problem setting netflow collectors", br->name); } svec_destroy(&nf_options.collectors); if (cfg_has("sflow.%s.host", br->name)) { struct ofproto_sflow_options oso; svec_init(&oso.targets); cfg_get_all_keys(&oso.targets, "sflow.%s.host", br->name); oso.sampling_rate = SFL_DEFAULT_SAMPLING_RATE; if (cfg_has("sflow.%s.sampling", br->name)) { oso.sampling_rate = cfg_get_int(0, "sflow.%s.sampling", br->name); } oso.polling_interval = SFL_DEFAULT_POLLING_INTERVAL; if (cfg_has("sflow.%s.polling", br->name)) { oso.polling_interval = cfg_get_int(0, "sflow.%s.polling", br->name); } oso.header_len = SFL_DEFAULT_HEADER_SIZE; if (cfg_has("sflow.%s.header", br->name)) { oso.header_len = cfg_get_int(0, "sflow.%s.header", br->name); } oso.sub_id = sflow_bridge_number++; oso.agent_device = (char *) cfg_get_string(0, "sflow.%s.agent", br->name); oso.control_ip = (char *) cfg_get_string(0, "bridge.%s.controller.ip", br->name); ofproto_set_sflow(br->ofproto, &oso); svec_destroy(&oso.targets); } else { ofproto_set_sflow(br->ofproto, NULL); } /* Update the controller and related settings. It would be more * straightforward to call this from bridge_reconfigure_one(), but we * can't do it there for two reasons. First, and most importantly, at * that point we don't know the dp_ifidx of any interfaces that have * been added to the bridge (because we haven't actually added them to * the datapath). Second, at that point we haven't set the datapath ID * yet; when a controller is configured, resetting the datapath ID will * immediately disconnect from the controller, so it's better to set * the datapath ID before the controller. */ bridge_reconfigure_controller(br); } LIST_FOR_EACH (br, struct bridge, node, &all_bridges) { for (i = 0; i < br->n_ports; i++) { struct port *port = br->ports[i]; port_update_vlan_compat(port); port_update_bonding(port); } } LIST_FOR_EACH (br, struct bridge, node, &all_bridges) { brstp_reconfigure(br); iterate_and_prune_ifaces(br, set_iface_properties, NULL); } } static void bridge_pick_local_hw_addr(struct bridge *br, uint8_t ea[ETH_ADDR_LEN], struct iface **hw_addr_iface) { uint64_t requested_ea; size_t i, j; int error; *hw_addr_iface = NULL; /* Did the user request a particular MAC? */ requested_ea = cfg_get_mac(0, "bridge.%s.mac", br->name); if (requested_ea) { eth_addr_from_uint64(requested_ea, ea); if (eth_addr_is_multicast(ea)) { VLOG_ERR("bridge %s: cannot set MAC address to multicast " "address "ETH_ADDR_FMT, br->name, ETH_ADDR_ARGS(ea)); } else if (eth_addr_is_zero(ea)) { VLOG_ERR("bridge %s: cannot set MAC address to zero", br->name); } else { return; } } /* Otherwise choose the minimum MAC address among all of the interfaces. * (Xen uses FE:FF:FF:FF:FF:FF for virtual interfaces so this will get the * MAC of the physical interface in such an environment.) */ memset(ea, 0xff, sizeof ea); for (i = 0; i < br->n_ports; i++) { struct port *port = br->ports[i]; uint8_t iface_ea[ETH_ADDR_LEN]; uint64_t iface_ea_u64; struct iface *iface; /* Mirror output ports don't participate. */ if (port->is_mirror_output_port) { continue; } /* Choose the MAC address to represent the port. */ iface_ea_u64 = cfg_get_mac(0, "port.%s.mac", port->name); if (iface_ea_u64) { /* User specified explicitly. */ eth_addr_from_uint64(iface_ea_u64, iface_ea); /* Find the interface with this Ethernet address (if any) so that * we can provide the correct devname to the caller. */ iface = NULL; for (j = 0; j < port->n_ifaces; j++) { struct iface *candidate = port->ifaces[j]; uint8_t candidate_ea[ETH_ADDR_LEN]; if (!netdev_get_etheraddr(candidate->netdev, candidate_ea) && eth_addr_equals(iface_ea, candidate_ea)) { iface = candidate; } } } else { /* Choose the interface whose MAC address will represent the port. * The Linux kernel bonding code always chooses the MAC address of * the first slave added to a bond, and the Fedora networking * scripts always add slaves to a bond in alphabetical order, so * for compatibility we choose the interface with the name that is * first in alphabetical order. */ iface = port->ifaces[0]; for (j = 1; j < port->n_ifaces; j++) { struct iface *candidate = port->ifaces[j]; if (strcmp(candidate->name, iface->name) < 0) { iface = candidate; } } /* The local port doesn't count (since we're trying to choose its * MAC address anyway). Other internal ports don't count because * we really want a physical MAC if we can get it, and internal * ports typically have randomly generated MACs. */ if (iface->dp_ifidx == ODPP_LOCAL || cfg_get_bool(0, "iface.%s.internal", iface->name)) { continue; } /* Grab MAC. */ error = netdev_get_etheraddr(iface->netdev, iface_ea); if (error) { static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); VLOG_ERR_RL(&rl, "failed to obtain Ethernet address of %s: %s", iface->name, strerror(error)); continue; } } /* Compare against our current choice. */ if (!eth_addr_is_multicast(iface_ea) && !eth_addr_is_reserved(iface_ea) && !eth_addr_is_zero(iface_ea) && memcmp(iface_ea, ea, ETH_ADDR_LEN) < 0) { memcpy(ea, iface_ea, ETH_ADDR_LEN); *hw_addr_iface = iface; } } if (eth_addr_is_multicast(ea) || eth_addr_is_vif(ea)) { memcpy(ea, br->default_ea, ETH_ADDR_LEN); *hw_addr_iface = NULL; VLOG_WARN("bridge %s: using default bridge Ethernet " "address "ETH_ADDR_FMT, br->name, ETH_ADDR_ARGS(ea)); } else { VLOG_DBG("bridge %s: using bridge Ethernet address "ETH_ADDR_FMT, br->name, ETH_ADDR_ARGS(ea)); } } /* Choose and returns the datapath ID for bridge 'br' given that the bridge * Ethernet address is 'bridge_ea'. If 'bridge_ea' is the Ethernet address of * an interface on 'br', then that interface must be passed in as * 'hw_addr_iface'; if 'bridge_ea' was derived some other way, then * 'hw_addr_iface' must be passed in as a null pointer. */ static uint64_t bridge_pick_datapath_id(struct bridge *br, const uint8_t bridge_ea[ETH_ADDR_LEN], struct iface *hw_addr_iface) { /* * The procedure for choosing a bridge MAC address will, in the most * ordinary case, also choose a unique MAC that we can use as a datapath * ID. In some special cases, though, multiple bridges will end up with * the same MAC address. This is OK for the bridges, but it will confuse * the OpenFlow controller, because each datapath needs a unique datapath * ID. * * Datapath IDs must be unique. It is also very desirable that they be * stable from one run to the next, so that policy set on a datapath * "sticks". */ uint64_t dpid; dpid = cfg_get_dpid(0, "bridge.%s.datapath-id", br->name); if (dpid) { return dpid; } if (hw_addr_iface) { int vlan; if (!netdev_get_vlan_vid(hw_addr_iface->netdev, &vlan)) { /* * A bridge whose MAC address is taken from a VLAN network device * (that is, a network device created with vconfig(8) or similar * tool) will have the same MAC address as a bridge on the VLAN * device's physical network device. * * Handle this case by hashing the physical network device MAC * along with the VLAN identifier. */ uint8_t buf[ETH_ADDR_LEN + 2]; memcpy(buf, bridge_ea, ETH_ADDR_LEN); buf[ETH_ADDR_LEN] = vlan >> 8; buf[ETH_ADDR_LEN + 1] = vlan; return dpid_from_hash(buf, sizeof buf); } else { /* * Assume that this bridge's MAC address is unique, since it * doesn't fit any of the cases we handle specially. */ } } else { /* * A purely internal bridge, that is, one that has no non-virtual * network devices on it at all, is more difficult because it has no * natural unique identifier at all. * * When the host is a XenServer, we handle this case by hashing the * host's UUID with the name of the bridge. Names of bridges are * persistent across XenServer reboots, although they can be reused if * an internal network is destroyed and then a new one is later * created, so this is fairly effective. * * When the host is not a XenServer, we punt by using a random MAC * address on each run. */ const char *host_uuid = xenserver_get_host_uuid(); if (host_uuid) { char *combined = xasprintf("%s,%s", host_uuid, br->name); dpid = dpid_from_hash(combined, strlen(combined)); free(combined); return dpid; } } return eth_addr_to_uint64(bridge_ea); } static uint64_t dpid_from_hash(const void *data, size_t n) { uint8_t hash[SHA1_DIGEST_SIZE]; BUILD_ASSERT_DECL(sizeof hash >= ETH_ADDR_LEN); sha1_bytes(data, n, hash); eth_addr_mark_random(hash); return eth_addr_to_uint64(hash); } int bridge_run(void) { struct bridge *br, *next; int retval; retval = 0; LIST_FOR_EACH_SAFE (br, next, struct bridge, node, &all_bridges) { int error = bridge_run_one(br); if (error) { static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); VLOG_ERR_RL(&rl, "bridge %s: datapath was destroyed externally, " "forcing reconfiguration", br->name); if (!retval) { retval = error; } } } return retval; } void bridge_wait(void) { struct bridge *br; LIST_FOR_EACH (br, struct bridge, node, &all_bridges) { ofproto_wait(br->ofproto); if (br->controller) { continue; } mac_learning_wait(br->ml); bond_wait(br); brstp_wait(br); } } /* Forces 'br' to revalidate all of its flows. This is appropriate when 'br''s * configuration changes. */ static void bridge_flush(struct bridge *br) { COVERAGE_INC(bridge_flush); br->flush = true; mac_learning_flush(br->ml); } /* Returns the 'br' interface for the ODPP_LOCAL port, or null if 'br' has no * such interface. */ static struct iface * bridge_get_local_iface(struct bridge *br) { size_t i, j; for (i = 0; i < br->n_ports; i++) { struct port *port = br->ports[i]; for (j = 0; j < port->n_ifaces; j++) { struct iface *iface = port->ifaces[j]; if (iface->dp_ifidx == ODPP_LOCAL) { return iface; } } } return NULL; } /* Bridge unixctl user interface functions. */ static void bridge_unixctl_fdb_show(struct unixctl_conn *conn, const char *args) { struct ds ds = DS_EMPTY_INITIALIZER; const struct bridge *br; const struct mac_entry *e; br = bridge_lookup(args); if (!br) { unixctl_command_reply(conn, 501, "no such bridge"); return; } ds_put_cstr(&ds, " port VLAN MAC Age\n"); LIST_FOR_EACH (e, struct mac_entry, lru_node, &br->ml->lrus) { if (e->port < 0 || e->port >= br->n_ports) { continue; } ds_put_format(&ds, "%5d %4d "ETH_ADDR_FMT" %3d\n", br->ports[e->port]->ifaces[0]->dp_ifidx, e->vlan, ETH_ADDR_ARGS(e->mac), mac_entry_age(e)); } unixctl_command_reply(conn, 200, ds_cstr(&ds)); ds_destroy(&ds); } /* Bridge reconfiguration functions. */ static struct bridge * bridge_create(const char *name) { struct bridge *br; int error; assert(!bridge_lookup(name)); br = xcalloc(1, sizeof *br); error = dpif_create_and_open(name, &br->dpif); if (error) { free(br); return NULL; } dpif_flow_flush(br->dpif); error = ofproto_create(name, &bridge_ofhooks, br, &br->ofproto); if (error) { VLOG_ERR("failed to create switch %s: %s", name, strerror(error)); dpif_delete(br->dpif); dpif_close(br->dpif); free(br); return NULL; } br->name = xstrdup(name); br->ml = mac_learning_create(); br->sent_config_request = false; eth_addr_random(br->default_ea); port_array_init(&br->ifaces); br->flush = false; br->bond_next_rebalance = time_msec() + 10000; list_push_back(&all_bridges, &br->node); VLOG_INFO("created bridge %s on %s", br->name, dpif_name(br->dpif)); return br; } static void bridge_destroy(struct bridge *br) { if (br) { int error; while (br->n_ports > 0) { port_destroy(br->ports[br->n_ports - 1]); } list_remove(&br->node); error = dpif_delete(br->dpif); if (error && error != ENOENT) { VLOG_ERR("failed to delete %s: %s", dpif_name(br->dpif), strerror(error)); } dpif_close(br->dpif); ofproto_destroy(br->ofproto); free(br->controller); mac_learning_destroy(br->ml); port_array_destroy(&br->ifaces); free(br->ports); free(br->name); free(br); } } static struct bridge * bridge_lookup(const char *name) { struct bridge *br; LIST_FOR_EACH (br, struct bridge, node, &all_bridges) { if (!strcmp(br->name, name)) { return br; } } return NULL; } bool bridge_exists(const char *name) { return bridge_lookup(name) ? true : false; } uint64_t bridge_get_datapathid(const char *name) { struct bridge *br = bridge_lookup(name); return br ? ofproto_get_datapath_id(br->ofproto) : 0; } /* Handle requests for a listing of all flows known by the OpenFlow * stack, including those normally hidden. */ static void bridge_unixctl_dump_flows(struct unixctl_conn *conn, const char *args) { struct bridge *br; struct ds results; br = bridge_lookup(args); if (!br) { unixctl_command_reply(conn, 501, "Unknown bridge"); return; } ds_init(&results); ofproto_get_all_flows(br->ofproto, &results); unixctl_command_reply(conn, 200, ds_cstr(&results)); ds_destroy(&results); } static int bridge_run_one(struct bridge *br) { int error; error = ofproto_run1(br->ofproto); if (error) { return error; } mac_learning_run(br->ml, ofproto_get_revalidate_set(br->ofproto)); bond_run(br); brstp_run(br); error = ofproto_run2(br->ofproto, br->flush); br->flush = false; return error; } static const char * bridge_get_controller(const struct bridge *br) { const char *controller; controller = cfg_get_string(0, "bridge.%s.controller", br->name); if (!controller) { controller = cfg_get_string(0, "mgmt.controller"); } return controller && controller[0] ? controller : NULL; } static bool check_duplicate_ifaces(struct bridge *br, struct iface *iface, void *ifaces_) { struct svec *ifaces = ifaces_; if (!svec_contains(ifaces, iface->name)) { svec_add(ifaces, iface->name); svec_sort(ifaces); return true; } else { VLOG_ERR("bridge %s: %s interface is on multiple ports, " "removing from %s", br->name, iface->name, iface->port->name); return false; } } static void bridge_reconfigure_one(struct bridge *br) { struct svec old_ports, new_ports, ifaces; struct svec listeners, old_listeners; struct svec snoops, old_snoops; size_t i; /* Collect old ports. */ svec_init(&old_ports); for (i = 0; i < br->n_ports; i++) { svec_add(&old_ports, br->ports[i]->name); } svec_sort(&old_ports); assert(svec_is_unique(&old_ports)); /* Collect new ports. */ svec_init(&new_ports); cfg_get_all_keys(&new_ports, "bridge.%s.port", br->name); svec_sort(&new_ports); if (bridge_get_controller(br)) { char local_name[IF_NAMESIZE]; int error; error = dpif_port_get_name(br->dpif, ODPP_LOCAL, local_name, sizeof local_name); if (!error && !svec_contains(&new_ports, local_name)) { svec_add(&new_ports, local_name); svec_sort(&new_ports); } } if (!svec_is_unique(&new_ports)) { VLOG_WARN("bridge %s: %s specified twice as bridge port", br->name, svec_get_duplicate(&new_ports)); svec_unique(&new_ports); } ofproto_set_mgmt_id(br->ofproto, mgmt_id); /* Get rid of deleted ports and add new ports. */ for (i = 0; i < br->n_ports; ) { struct port *port = br->ports[i]; if (!svec_contains(&new_ports, port->name)) { port_destroy(port); } else { i++; } } for (i = 0; i < new_ports.n; i++) { const char *name = new_ports.names[i]; if (!svec_contains(&old_ports, name)) { port_create(br, name); } } svec_destroy(&old_ports); svec_destroy(&new_ports); /* Reconfigure all ports. */ for (i = 0; i < br->n_ports; i++) { port_reconfigure(br->ports[i]); } /* Check and delete duplicate interfaces. */ svec_init(&ifaces); iterate_and_prune_ifaces(br, check_duplicate_ifaces, &ifaces); svec_destroy(&ifaces); /* Delete all flows if we're switching from connected to standalone or vice * versa. (XXX Should we delete all flows if we are switching from one * controller to another?) */ /* Configure OpenFlow management listeners. */ svec_init(&listeners); cfg_get_all_strings(&listeners, "bridge.%s.openflow.listeners", br->name); if (!listeners.n) { svec_add_nocopy(&listeners, xasprintf("punix:%s/%s.mgmt", ovs_rundir, br->name)); } else if (listeners.n == 1 && !strcmp(listeners.names[0], "none")) { svec_clear(&listeners); } svec_sort_unique(&listeners); svec_init(&old_listeners); ofproto_get_listeners(br->ofproto, &old_listeners); svec_sort_unique(&old_listeners); if (!svec_equal(&listeners, &old_listeners)) { ofproto_set_listeners(br->ofproto, &listeners); } svec_destroy(&listeners); svec_destroy(&old_listeners); /* Configure OpenFlow controller connection snooping. */ svec_init(&snoops); cfg_get_all_strings(&snoops, "bridge.%s.openflow.snoops", br->name); if (!snoops.n) { svec_add_nocopy(&snoops, xasprintf("punix:%s/%s.snoop", ovs_rundir, br->name)); } else if (snoops.n == 1 && !strcmp(snoops.names[0], "none")) { svec_clear(&snoops); } svec_sort_unique(&snoops); svec_init(&old_snoops); ofproto_get_snoops(br->ofproto, &old_snoops); svec_sort_unique(&old_snoops); if (!svec_equal(&snoops, &old_snoops)) { ofproto_set_snoops(br->ofproto, &snoops); } svec_destroy(&snoops); svec_destroy(&old_snoops); mirror_reconfigure(br); } static void bridge_reconfigure_controller(struct bridge *br) { char *pfx = xasprintf("bridge.%s.controller", br->name); const char *controller; controller = bridge_get_controller(br); if ((br->controller != NULL) != (controller != NULL)) { ofproto_flush_flows(br->ofproto); } free(br->controller); br->controller = controller ? xstrdup(controller) : NULL; if (controller) { const char *fail_mode; int max_backoff, probe; int rate_limit, burst_limit; if (!strcmp(controller, "discover")) { bool update_resolv_conf = true; if (cfg_has("%s.update-resolv.conf", pfx)) { update_resolv_conf = cfg_get_bool(0, "%s.update-resolv.conf", pfx); } ofproto_set_discovery(br->ofproto, true, cfg_get_string(0, "%s.accept-regex", pfx), update_resolv_conf); } else { struct iface *local_iface; bool in_band; in_band = (!cfg_is_valid(CFG_BOOL | CFG_REQUIRED, "%s.in-band", pfx) || cfg_get_bool(0, "%s.in-band", pfx)); ofproto_set_discovery(br->ofproto, false, NULL, NULL); ofproto_set_in_band(br->ofproto, in_band); local_iface = bridge_get_local_iface(br); if (local_iface && cfg_is_valid(CFG_IP | CFG_REQUIRED, "%s.ip", pfx)) { struct netdev *netdev = local_iface->netdev; struct in_addr ip, mask, gateway; ip.s_addr = cfg_get_ip(0, "%s.ip", pfx); mask.s_addr = cfg_get_ip(0, "%s.netmask", pfx); gateway.s_addr = cfg_get_ip(0, "%s.gateway", pfx); netdev_turn_flags_on(netdev, NETDEV_UP, true); if (!mask.s_addr) { mask.s_addr = guess_netmask(ip.s_addr); } if (!netdev_set_in4(netdev, ip, mask)) { VLOG_INFO("bridge %s: configured IP address "IP_FMT", " "netmask "IP_FMT, br->name, IP_ARGS(&ip.s_addr), IP_ARGS(&mask.s_addr)); } if (gateway.s_addr) { if (!netdev_add_router(netdev, gateway)) { VLOG_INFO("bridge %s: configured gateway "IP_FMT, br->name, IP_ARGS(&gateway.s_addr)); } } } } fail_mode = cfg_get_string(0, "%s.fail-mode", pfx); if (!fail_mode) { fail_mode = cfg_get_string(0, "mgmt.fail-mode"); } ofproto_set_failure(br->ofproto, (!fail_mode || !strcmp(fail_mode, "standalone") || !strcmp(fail_mode, "open"))); probe = cfg_get_int(0, "%s.inactivity-probe", pfx); if (probe < 5) { probe = cfg_get_int(0, "mgmt.inactivity-probe"); if (probe < 5) { probe = 5; } } ofproto_set_probe_interval(br->ofproto, probe); max_backoff = cfg_get_int(0, "%s.max-backoff", pfx); if (!max_backoff) { max_backoff = cfg_get_int(0, "mgmt.max-backoff"); if (!max_backoff) { max_backoff = 8; } } ofproto_set_max_backoff(br->ofproto, max_backoff); rate_limit = cfg_get_int(0, "%s.rate-limit", pfx); if (!rate_limit) { rate_limit = cfg_get_int(0, "mgmt.rate-limit"); } burst_limit = cfg_get_int(0, "%s.burst-limit", pfx); if (!burst_limit) { burst_limit = cfg_get_int(0, "mgmt.burst-limit"); } ofproto_set_rate_limit(br->ofproto, rate_limit, burst_limit); ofproto_set_stp(br->ofproto, cfg_get_bool(0, "%s.stp", pfx)); if (cfg_has("%s.commands.acl", pfx)) { struct svec command_acls; char *command_acl; svec_init(&command_acls); cfg_get_all_strings(&command_acls, "%s.commands.acl", pfx); command_acl = svec_join(&command_acls, ",", ""); ofproto_set_remote_execution(br->ofproto, command_acl, cfg_get_string(0, "%s.commands.dir", pfx)); svec_destroy(&command_acls); free(command_acl); } else { ofproto_set_remote_execution(br->ofproto, NULL, NULL); } } else { union ofp_action action; flow_t flow; /* Set up a flow that matches every packet and directs them to * OFPP_NORMAL (which goes to us). */ memset(&action, 0, sizeof action); action.type = htons(OFPAT_OUTPUT); action.output.len = htons(sizeof action); action.output.port = htons(OFPP_NORMAL); memset(&flow, 0, sizeof flow); ofproto_add_flow(br->ofproto, &flow, OFPFW_ALL, 0, &action, 1, 0); ofproto_set_in_band(br->ofproto, false); ofproto_set_max_backoff(br->ofproto, 1); ofproto_set_probe_interval(br->ofproto, 5); ofproto_set_failure(br->ofproto, false); ofproto_set_stp(br->ofproto, false); } free(pfx); ofproto_set_controller(br->ofproto, br->controller); } static void bridge_get_all_ifaces(const struct bridge *br, struct svec *ifaces) { size_t i, j; svec_init(ifaces); for (i = 0; i < br->n_ports; i++) { struct port *port = br->ports[i]; for (j = 0; j < port->n_ifaces; j++) { struct iface *iface = port->ifaces[j]; svec_add(ifaces, iface->name); } if (port->n_ifaces > 1 && cfg_get_bool(0, "bonding.%s.fake-iface", port->name)) { svec_add(ifaces, port->name); } } svec_sort_unique(ifaces); } /* For robustness, in case the administrator moves around datapath ports behind * our back, we re-check all the datapath port numbers here. * * This function will set the 'dp_ifidx' members of interfaces that have * disappeared to -1, so only call this function from a context where those * 'struct iface's will be removed from the bridge. Otherwise, the -1 * 'dp_ifidx'es will cause trouble later when we try to send them to the * datapath, which doesn't support UINT16_MAX+1 ports. */ static void bridge_fetch_dp_ifaces(struct bridge *br) { struct odp_port *dpif_ports; size_t n_dpif_ports; size_t i, j; /* Reset all interface numbers. */ for (i = 0; i < br->n_ports; i++) { struct port *port = br->ports[i]; for (j = 0; j < port->n_ifaces; j++) { struct iface *iface = port->ifaces[j]; iface->dp_ifidx = -1; } } port_array_clear(&br->ifaces); dpif_port_list(br->dpif, &dpif_ports, &n_dpif_ports); for (i = 0; i < n_dpif_ports; i++) { struct odp_port *p = &dpif_ports[i]; struct iface *iface = iface_lookup(br, p->devname); if (iface) { if (iface->dp_ifidx >= 0) { VLOG_WARN("%s reported interface %s twice", dpif_name(br->dpif), p->devname); } else if (iface_from_dp_ifidx(br, p->port)) { VLOG_WARN("%s reported interface %"PRIu16" twice", dpif_name(br->dpif), p->port); } else { port_array_set(&br->ifaces, p->port, iface); iface->dp_ifidx = p->port; } } } free(dpif_ports); } /* Bridge packet processing functions. */ static int bond_hash(const uint8_t mac[ETH_ADDR_LEN]) { return hash_bytes(mac, ETH_ADDR_LEN, 0) & BOND_MASK; } static struct bond_entry * lookup_bond_entry(const struct port *port, const uint8_t mac[ETH_ADDR_LEN]) { return &port->bond_hash[bond_hash(mac)]; } static int bond_choose_iface(const struct port *port) { static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20); size_t i, best_down_slave = -1; long long next_delay_expiration = LLONG_MAX; for (i = 0; i < port->n_ifaces; i++) { struct iface *iface = port->ifaces[i]; if (iface->enabled) { return i; } else if (iface->delay_expires < next_delay_expiration) { best_down_slave = i; next_delay_expiration = iface->delay_expires; } } if (best_down_slave != -1) { struct iface *iface = port->ifaces[best_down_slave]; VLOG_INFO_RL(&rl, "interface %s: skipping remaining %lli ms updelay " "since no other interface is up", iface->name, iface->delay_expires - time_msec()); bond_enable_slave(iface, true); } return best_down_slave; } static bool choose_output_iface(const struct port *port, const uint8_t *dl_src, uint16_t *dp_ifidx, tag_type *tags) { struct iface *iface; assert(port->n_ifaces); if (port->n_ifaces == 1) { iface = port->ifaces[0]; } else { struct bond_entry *e = lookup_bond_entry(port, dl_src); if (e->iface_idx < 0 || e->iface_idx >= port->n_ifaces || !port->ifaces[e->iface_idx]->enabled) { /* XXX select interface properly. The current interface selection * is only good for testing the rebalancing code. */ e->iface_idx = bond_choose_iface(port); if (e->iface_idx < 0) { *tags |= port->no_ifaces_tag; return false; } e->iface_tag = tag_create_random(); ((struct port *) port)->bond_compat_is_stale = true; } *tags |= e->iface_tag; iface = port->ifaces[e->iface_idx]; } *dp_ifidx = iface->dp_ifidx; *tags |= iface->tag; /* Currently only used for bonding. */ return true; } static void bond_link_status_update(struct iface *iface, bool carrier) { static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20); struct port *port = iface->port; if ((carrier == iface->enabled) == (iface->delay_expires == LLONG_MAX)) { /* Nothing to do. */ return; } VLOG_INFO_RL(&rl, "interface %s: carrier %s", iface->name, carrier ? "detected" : "dropped"); if (carrier == iface->enabled) { iface->delay_expires = LLONG_MAX; VLOG_INFO_RL(&rl, "interface %s: will not be %s", iface->name, carrier ? "disabled" : "enabled"); } else if (carrier && port->active_iface < 0) { bond_enable_slave(iface, true); if (port->updelay) { VLOG_INFO_RL(&rl, "interface %s: skipping %d ms updelay since no " "other interface is up", iface->name, port->updelay); } } else { int delay = carrier ? port->updelay : port->downdelay; iface->delay_expires = time_msec() + delay; if (delay) { VLOG_INFO_RL(&rl, "interface %s: will be %s if it stays %s for %d ms", iface->name, carrier ? "enabled" : "disabled", carrier ? "up" : "down", delay); } } } static void bond_choose_active_iface(struct port *port) { static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20); port->active_iface = bond_choose_iface(port); port->active_iface_tag = tag_create_random(); if (port->active_iface >= 0) { VLOG_INFO_RL(&rl, "port %s: active interface is now %s", port->name, port->ifaces[port->active_iface]->name); } else { VLOG_WARN_RL(&rl, "port %s: all ports disabled, no active interface", port->name); } } static void bond_enable_slave(struct iface *iface, bool enable) { struct port *port = iface->port; struct bridge *br = port->bridge; /* This acts as a recursion check. If the act of disabling a slave * causes a different slave to be enabled, the flag will allow us to * skip redundant work when we reenter this function. It must be * cleared on exit to keep things safe with multiple bonds. */ static bool moving_active_iface = false; iface->delay_expires = LLONG_MAX; if (enable == iface->enabled) { return; } iface->enabled = enable; if (!iface->enabled) { VLOG_WARN("interface %s: disabled", iface->name); ofproto_revalidate(br->ofproto, iface->tag); if (iface->port_ifidx == port->active_iface) { ofproto_revalidate(br->ofproto, port->active_iface_tag); /* Disabling a slave can lead to another slave being immediately * enabled if there will be no active slaves but one is waiting * on an updelay. In this case we do not need to run most of the * code for the newly enabled slave since there was no period * without an active slave and it is redundant with the disabling * path. */ moving_active_iface = true; bond_choose_active_iface(port); } bond_send_learning_packets(port); } else { VLOG_WARN("interface %s: enabled", iface->name); if (port->active_iface < 0 && !moving_active_iface) { ofproto_revalidate(br->ofproto, port->no_ifaces_tag); bond_choose_active_iface(port); bond_send_learning_packets(port); } iface->tag = tag_create_random(); } moving_active_iface = false; port->bond_compat_is_stale = true; } static void bond_run(struct bridge *br) { size_t i, j; for (i = 0; i < br->n_ports; i++) { struct port *port = br->ports[i]; if (port->n_ifaces >= 2) { for (j = 0; j < port->n_ifaces; j++) { struct iface *iface = port->ifaces[j]; if (time_msec() >= iface->delay_expires) { bond_enable_slave(iface, !iface->enabled); } } } if (port->bond_compat_is_stale) { port->bond_compat_is_stale = false; port_update_bond_compat(port); } } } static void bond_wait(struct bridge *br) { size_t i, j; for (i = 0; i < br->n_ports; i++) { struct port *port = br->ports[i]; if (port->n_ifaces < 2) { continue; } for (j = 0; j < port->n_ifaces; j++) { struct iface *iface = port->ifaces[j]; if (iface->delay_expires != LLONG_MAX) { poll_timer_wait(iface->delay_expires - time_msec()); } } } } static bool set_dst(struct dst *p, const flow_t *flow, const struct port *in_port, const struct port *out_port, tag_type *tags) { /* STP handling. * * XXX This uses too many tags: any broadcast flow will get one tag per * destination port, and thus a broadcast on a switch of any size is likely * to have all tag bits set. We should figure out a way to be smarter. * * This is OK when STP is disabled, because stp_state_tag is 0 then. */ *tags |= out_port->stp_state_tag; if (!(out_port->stp_state & (STP_DISABLED | STP_FORWARDING))) { return false; } p->vlan = (out_port->vlan >= 0 ? OFP_VLAN_NONE : in_port->vlan >= 0 ? in_port->vlan : ntohs(flow->dl_vlan)); return choose_output_iface(out_port, flow->dl_src, &p->dp_ifidx, tags); } static void swap_dst(struct dst *p, struct dst *q) { struct dst tmp = *p; *p = *q; *q = tmp; } /* Moves all the dsts with vlan == 'vlan' to the front of the 'n_dsts' in * 'dsts'. (This may help performance by reducing the number of VLAN changes * that we push to the datapath. We could in fact fully sort the array by * vlan, but in most cases there are at most two different vlan tags so that's * possibly overkill.) */ static void partition_dsts(struct dst *dsts, size_t n_dsts, int vlan) { struct dst *first = dsts; struct dst *last = dsts + n_dsts; while (first != last) { /* Invariants: * - All dsts < first have vlan == 'vlan'. * - All dsts >= last have vlan != 'vlan'. * - first < last. */ while (first->vlan == vlan) { if (++first == last) { return; } } /* Same invariants, plus one additional: * - first->vlan != vlan. */ while (last[-1].vlan != vlan) { if (--last == first) { return; } } /* Same invariants, plus one additional: * - last[-1].vlan == vlan.*/ swap_dst(first++, --last); } } static int mirror_mask_ffs(mirror_mask_t mask) { BUILD_ASSERT_DECL(sizeof(unsigned int) >= sizeof(mask)); return ffs(mask); } static bool dst_is_duplicate(const struct dst *dsts, size_t n_dsts, const struct dst *test) { size_t i; for (i = 0; i < n_dsts; i++) { if (dsts[i].vlan == test->vlan && dsts[i].dp_ifidx == test->dp_ifidx) { return true; } } return false; } static bool port_trunks_vlan(const struct port *port, uint16_t vlan) { return port->vlan < 0 && bitmap_is_set(port->trunks, vlan); } static bool port_includes_vlan(const struct port *port, uint16_t vlan) { return vlan == port->vlan || port_trunks_vlan(port, vlan); } static size_t compose_dsts(const struct bridge *br, const flow_t *flow, uint16_t vlan, const struct port *in_port, const struct port *out_port, struct dst dsts[], tag_type *tags, uint16_t *nf_output_iface) { mirror_mask_t mirrors = in_port->src_mirrors; struct dst *dst = dsts; size_t i; *tags |= in_port->stp_state_tag; if (out_port == FLOOD_PORT) { /* XXX use ODP_FLOOD if no vlans or bonding. */ /* XXX even better, define each VLAN as a datapath port group */ for (i = 0; i < br->n_ports; i++) { struct port *port = br->ports[i]; if (port != in_port && port_includes_vlan(port, vlan) && !port->is_mirror_output_port && set_dst(dst, flow, in_port, port, tags)) { mirrors |= port->dst_mirrors; dst++; } } *nf_output_iface = NF_OUT_FLOOD; } else if (out_port && set_dst(dst, flow, in_port, out_port, tags)) { *nf_output_iface = dst->dp_ifidx; mirrors |= out_port->dst_mirrors; dst++; } while (mirrors) { struct mirror *m = br->mirrors[mirror_mask_ffs(mirrors) - 1]; if (!m->n_vlans || vlan_is_mirrored(m, vlan)) { if (m->out_port) { if (set_dst(dst, flow, in_port, m->out_port, tags) && !dst_is_duplicate(dsts, dst - dsts, dst)) { dst++; } } else { for (i = 0; i < br->n_ports; i++) { struct port *port = br->ports[i]; if (port_includes_vlan(port, m->out_vlan) && set_dst(dst, flow, in_port, port, tags)) { int flow_vlan; if (port->vlan < 0) { dst->vlan = m->out_vlan; } if (dst_is_duplicate(dsts, dst - dsts, dst)) { continue; } /* Use the vlan tag on the original flow instead of * the one passed in the vlan parameter. This ensures * that we compare the vlan from before any implicit * tagging tags place. This is necessary because * dst->vlan is the final vlan, after removing implicit * tags. */ flow_vlan = ntohs(flow->dl_vlan); if (flow_vlan == 0) { flow_vlan = OFP_VLAN_NONE; } if (port == in_port && dst->vlan == flow_vlan) { /* Don't send out input port on same VLAN. */ continue; } dst++; } } } } mirrors &= mirrors - 1; } partition_dsts(dsts, dst - dsts, ntohs(flow->dl_vlan)); return dst - dsts; } static void UNUSED print_dsts(const struct dst *dsts, size_t n) { for (; n--; dsts++) { printf(">p%"PRIu16, dsts->dp_ifidx); if (dsts->vlan != OFP_VLAN_NONE) { printf("v%"PRIu16, dsts->vlan); } } } static void compose_actions(struct bridge *br, const flow_t *flow, uint16_t vlan, const struct port *in_port, const struct port *out_port, tag_type *tags, struct odp_actions *actions, uint16_t *nf_output_iface) { struct dst dsts[DP_MAX_PORTS * (MAX_MIRRORS + 1)]; size_t n_dsts; const struct dst *p; uint16_t cur_vlan; n_dsts = compose_dsts(br, flow, vlan, in_port, out_port, dsts, tags, nf_output_iface); cur_vlan = ntohs(flow->dl_vlan); for (p = dsts; p < &dsts[n_dsts]; p++) { union odp_action *a; if (p->vlan != cur_vlan) { if (p->vlan == OFP_VLAN_NONE) { odp_actions_add(actions, ODPAT_STRIP_VLAN); } else { a = odp_actions_add(actions, ODPAT_SET_VLAN_VID); a->vlan_vid.vlan_vid = htons(p->vlan); } cur_vlan = p->vlan; } a = odp_actions_add(actions, ODPAT_OUTPUT); a->output.port = p->dp_ifidx; } } /* Returns the effective vlan of a packet, taking into account both the * 802.1Q header and implicitly tagged ports. A value of 0 indicates that * the packet is untagged and -1 indicates it has an invalid header and * should be dropped. */ static int flow_get_vlan(struct bridge *br, const flow_t *flow, struct port *in_port, bool have_packet) { /* Note that dl_vlan of 0 and of OFP_VLAN_NONE both mean that the packet * belongs to VLAN 0, so we should treat both cases identically. (In the * former case, the packet has an 802.1Q header that specifies VLAN 0, * presumably to allow a priority to be specified. In the latter case, the * packet does not have any 802.1Q header.) */ int vlan = ntohs(flow->dl_vlan); if (vlan == OFP_VLAN_NONE) { vlan = 0; } if (in_port->vlan >= 0) { if (vlan) { /* XXX support double tagging? */ if (have_packet) { static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); VLOG_WARN_RL(&rl, "bridge %s: dropping VLAN %"PRIu16" tagged " "packet received on port %s configured with " "implicit VLAN %"PRIu16, br->name, ntohs(flow->dl_vlan), in_port->name, in_port->vlan); } return -1; } vlan = in_port->vlan; } else { if (!port_includes_vlan(in_port, vlan)) { if (have_packet) { static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); VLOG_WARN_RL(&rl, "bridge %s: dropping VLAN %d tagged " "packet received on port %s not configured for " "trunking VLAN %d", br->name, vlan, in_port->name, vlan); } return -1; } } return vlan; } static void update_learning_table(struct bridge *br, const flow_t *flow, int vlan, struct port *in_port) { tag_type rev_tag = mac_learning_learn(br->ml, flow->dl_src, vlan, in_port->port_idx); if (rev_tag) { /* The log messages here could actually be useful in debugging, * so keep the rate limit relatively high. */ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(30, 300); VLOG_DBG_RL(&rl, "bridge %s: learned that "ETH_ADDR_FMT" is " "on port %s in VLAN %d", br->name, ETH_ADDR_ARGS(flow->dl_src), in_port->name, vlan); ofproto_revalidate(br->ofproto, rev_tag); } } static bool is_bcast_arp_reply(const flow_t *flow) { return (flow->dl_type == htons(ETH_TYPE_ARP) && flow->nw_proto == ARP_OP_REPLY && eth_addr_is_broadcast(flow->dl_dst)); } /* If the composed actions may be applied to any packet in the given 'flow', * returns true. Otherwise, the actions should only be applied to 'packet', or * not at all, if 'packet' was NULL. */ static bool process_flow(struct bridge *br, const flow_t *flow, const struct ofpbuf *packet, struct odp_actions *actions, tag_type *tags, uint16_t *nf_output_iface) { struct iface *in_iface; struct port *in_port; struct port *out_port = NULL; /* By default, drop the packet/flow. */ int vlan; int out_port_idx; /* Find the interface and port structure for the received packet. */ in_iface = iface_from_dp_ifidx(br, flow->in_port); if (!in_iface) { /* No interface? Something fishy... */ if (packet != NULL) { /* Odd. A few possible reasons here: * * - We deleted an interface but there are still a few packets * queued up from it. * * - Someone externally added an interface (e.g. with "ovs-dpctl * add-if") that we don't know about. * * - Packet arrived on the local port but the local port is not * one of our bridge ports. */ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); VLOG_WARN_RL(&rl, "bridge %s: received packet on unknown " "interface %"PRIu16, br->name, flow->in_port); } /* Return without adding any actions, to drop packets on this flow. */ return true; } in_port = in_iface->port; vlan = flow_get_vlan(br, flow, in_port, !!packet); if (vlan < 0) { goto done; } /* Drop frames for ports that STP wants entirely killed (both for * forwarding and for learning). Later, after we do learning, we'll drop * the frames that STP wants to do learning but not forwarding on. */ if (in_port->stp_state & (STP_LISTENING | STP_BLOCKING)) { goto done; } /* Drop frames for reserved multicast addresses. */ if (eth_addr_is_reserved(flow->dl_dst)) { goto done; } /* Drop frames on ports reserved for mirroring. */ if (in_port->is_mirror_output_port) { static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); VLOG_WARN_RL(&rl, "bridge %s: dropping packet received on port %s, " "which is reserved exclusively for mirroring", br->name, in_port->name); goto done; } /* Packets received on bonds need special attention to avoid duplicates. */ if (in_port->n_ifaces > 1) { int src_idx; if (eth_addr_is_multicast(flow->dl_dst)) { *tags |= in_port->active_iface_tag; if (in_port->active_iface != in_iface->port_ifidx) { /* Drop all multicast packets on inactive slaves. */ goto done; } } /* Drop all packets for which we have learned a different input * port, because we probably sent the packet on one slave and got * it back on the other. Broadcast ARP replies are an exception * to this rule: the host has moved to another switch. */ src_idx = mac_learning_lookup(br->ml, flow->dl_src, vlan); if (src_idx != -1 && src_idx != in_port->port_idx && !is_bcast_arp_reply(flow)) { goto done; } } /* MAC learning. */ out_port = FLOOD_PORT; /* Learn source MAC (but don't try to learn from revalidation). */ if (packet) { update_learning_table(br, flow, vlan, in_port); } /* Determine output port. */ out_port_idx = mac_learning_lookup_tag(br->ml, flow->dl_dst, vlan, tags); if (out_port_idx >= 0 && out_port_idx < br->n_ports) { out_port = br->ports[out_port_idx]; } else if (!packet && !eth_addr_is_multicast(flow->dl_dst)) { /* If we are revalidating but don't have a learning entry then * eject the flow. Installing a flow that floods packets opens * up a window of time where we could learn from a packet reflected * on a bond and blackhole packets before the learning table is * updated to reflect the correct port. */ return false; } /* Don't send packets out their input ports. Don't forward frames that STP * wants us to discard. */ if (in_port == out_port || in_port->stp_state == STP_LEARNING) { out_port = NULL; } done: compose_actions(br, flow, vlan, in_port, out_port, tags, actions, nf_output_iface); return true; } /* Careful: 'opp' is in host byte order and opp->port_no is an OFP port * number. */ static void bridge_port_changed_ofhook_cb(enum ofp_port_reason reason, const struct ofp_phy_port *opp, void *br_) { struct bridge *br = br_; struct iface *iface; struct port *port; iface = iface_from_dp_ifidx(br, ofp_port_to_odp_port(opp->port_no)); if (!iface) { return; } port = iface->port; if (reason == OFPPR_DELETE) { VLOG_WARN("bridge %s: interface %s deleted unexpectedly", br->name, iface->name); iface_destroy(iface); if (!port->n_ifaces) { VLOG_WARN("bridge %s: port %s has no interfaces, dropping", br->name, port->name); port_destroy(port); } bridge_flush(br); } else { if (port->n_ifaces > 1) { bool up = !(opp->state & OFPPS_LINK_DOWN); bond_link_status_update(iface, up); port_update_bond_compat(port); } } } static bool bridge_normal_ofhook_cb(const flow_t *flow, const struct ofpbuf *packet, struct odp_actions *actions, tag_type *tags, uint16_t *nf_output_iface, void *br_) { struct bridge *br = br_; #if 0 if (flow->dl_type == htons(OFP_DL_TYPE_NOT_ETH_TYPE) && eth_addr_equals(flow->dl_dst, stp_eth_addr)) { brstp_receive(br, flow, payload); return true; } #endif COVERAGE_INC(bridge_process_flow); return process_flow(br, flow, packet, actions, tags, nf_output_iface); } static void bridge_account_flow_ofhook_cb(const flow_t *flow, const union odp_action *actions, size_t n_actions, unsigned long long int n_bytes, void *br_) { struct bridge *br = br_; struct port *in_port; const union odp_action *a; /* Feed information from the active flows back into the learning table * to ensure that table is always in sync with what is actually flowing * through the datapath. */ in_port = port_from_dp_ifidx(br, flow->in_port); if (in_port) { int vlan = flow_get_vlan(br, flow, in_port, false); if (vlan >= 0) { update_learning_table(br, flow, vlan, in_port); } } if (!br->has_bonded_ports) { return; } for (a = actions; a < &actions[n_actions]; a++) { if (a->type == ODPAT_OUTPUT) { struct port *out_port = port_from_dp_ifidx(br, a->output.port); if (out_port && out_port->n_ifaces >= 2) { struct bond_entry *e = lookup_bond_entry(out_port, flow->dl_src); e->tx_bytes += n_bytes; } } } } static void bridge_account_checkpoint_ofhook_cb(void *br_) { struct bridge *br = br_; size_t i; if (!br->has_bonded_ports) { return; } /* The current ofproto implementation calls this callback at least once a * second, so this timer implementation is sufficient. */ if (time_msec() < br->bond_next_rebalance) { return; } br->bond_next_rebalance = time_msec() + 10000; for (i = 0; i < br->n_ports; i++) { struct port *port = br->ports[i]; if (port->n_ifaces > 1) { bond_rebalance_port(port); } } } static struct ofhooks bridge_ofhooks = { bridge_port_changed_ofhook_cb, bridge_normal_ofhook_cb, bridge_account_flow_ofhook_cb, bridge_account_checkpoint_ofhook_cb, }; /* Bonding functions. */ /* Statistics for a single interface on a bonded port, used for load-based * bond rebalancing. */ struct slave_balance { struct iface *iface; /* The interface. */ uint64_t tx_bytes; /* Sum of hashes[*]->tx_bytes. */ /* All the "bond_entry"s that are assigned to this interface, in order of * increasing tx_bytes. */ struct bond_entry **hashes; size_t n_hashes; }; /* Sorts pointers to pointers to bond_entries in ascending order by the * interface to which they are assigned, and within a single interface in * ascending order of bytes transmitted. */ static int compare_bond_entries(const void *a_, const void *b_) { const struct bond_entry *const *ap = a_; const struct bond_entry *const *bp = b_; const struct bond_entry *a = *ap; const struct bond_entry *b = *bp; if (a->iface_idx != b->iface_idx) { return a->iface_idx > b->iface_idx ? 1 : -1; } else if (a->tx_bytes != b->tx_bytes) { return a->tx_bytes > b->tx_bytes ? 1 : -1; } else { return 0; } } /* Sorts slave_balances so that enabled ports come first, and otherwise in * *descending* order by number of bytes transmitted. */ static int compare_slave_balance(const void *a_, const void *b_) { const struct slave_balance *a = a_; const struct slave_balance *b = b_; if (a->iface->enabled != b->iface->enabled) { return a->iface->enabled ? -1 : 1; } else if (a->tx_bytes != b->tx_bytes) { return a->tx_bytes > b->tx_bytes ? -1 : 1; } else { return 0; } } static void swap_bals(struct slave_balance *a, struct slave_balance *b) { struct slave_balance tmp = *a; *a = *b; *b = tmp; } /* Restores the 'n_bals' slave_balance structures in 'bals' to sorted order * given that 'p' (and only 'p') might be in the wrong location. * * This function invalidates 'p', since it might now be in a different memory * location. */ static void resort_bals(struct slave_balance *p, struct slave_balance bals[], size_t n_bals) { if (n_bals > 1) { for (; p > bals && p->tx_bytes > p[-1].tx_bytes; p--) { swap_bals(p, p - 1); } for (; p < &bals[n_bals - 1] && p->tx_bytes < p[1].tx_bytes; p++) { swap_bals(p, p + 1); } } } static void log_bals(const struct slave_balance *bals, size_t n_bals, struct port *port) { if (VLOG_IS_DBG_ENABLED()) { struct ds ds = DS_EMPTY_INITIALIZER; const struct slave_balance *b; for (b = bals; b < bals + n_bals; b++) { size_t i; if (b > bals) { ds_put_char(&ds, ','); } ds_put_format(&ds, " %s %"PRIu64"kB", b->iface->name, b->tx_bytes / 1024); if (!b->iface->enabled) { ds_put_cstr(&ds, " (disabled)"); } if (b->n_hashes > 0) { ds_put_cstr(&ds, " ("); for (i = 0; i < b->n_hashes; i++) { const struct bond_entry *e = b->hashes[i]; if (i > 0) { ds_put_cstr(&ds, " + "); } ds_put_format(&ds, "h%td: %"PRIu64"kB", e - port->bond_hash, e->tx_bytes / 1024); } ds_put_cstr(&ds, ")"); } } VLOG_DBG("bond %s:%s", port->name, ds_cstr(&ds)); ds_destroy(&ds); } } /* Shifts 'hash' from 'from' to 'to' within 'port'. */ static void bond_shift_load(struct slave_balance *from, struct slave_balance *to, int hash_idx) { struct bond_entry *hash = from->hashes[hash_idx]; struct port *port = from->iface->port; uint64_t delta = hash->tx_bytes; VLOG_INFO("bond %s: shift %"PRIu64"kB of load (with hash %td) " "from %s to %s (now carrying %"PRIu64"kB and " "%"PRIu64"kB load, respectively)", port->name, delta / 1024, hash - port->bond_hash, from->iface->name, to->iface->name, (from->tx_bytes - delta) / 1024, (to->tx_bytes + delta) / 1024); /* Delete element from from->hashes. * * We don't bother to add the element to to->hashes because not only would * it require more work, the only purpose it would be to allow that hash to * be migrated to another slave in this rebalancing run, and there is no * point in doing that. */ if (hash_idx == 0) { from->hashes++; } else { memmove(from->hashes + hash_idx, from->hashes + hash_idx + 1, (from->n_hashes - (hash_idx + 1)) * sizeof *from->hashes); } from->n_hashes--; /* Shift load away from 'from' to 'to'. */ from->tx_bytes -= delta; to->tx_bytes += delta; /* Arrange for flows to be revalidated. */ ofproto_revalidate(port->bridge->ofproto, hash->iface_tag); hash->iface_idx = to->iface->port_ifidx; hash->iface_tag = tag_create_random(); } static void bond_rebalance_port(struct port *port) { struct slave_balance bals[DP_MAX_PORTS]; size_t n_bals; struct bond_entry *hashes[BOND_MASK + 1]; struct slave_balance *b, *from, *to; struct bond_entry *e; size_t i; /* Sets up 'bals' to describe each of the port's interfaces, sorted in * descending order of tx_bytes, so that bals[0] represents the most * heavily loaded slave and bals[n_bals - 1] represents the least heavily * loaded slave. * * The code is a bit tricky: to avoid dynamically allocating a 'hashes' * array for each slave_balance structure, we sort our local array of * hashes in order by slave, so that all of the hashes for a given slave * become contiguous in memory, and then we point each 'hashes' members of * a slave_balance structure to the start of a contiguous group. */ n_bals = port->n_ifaces; for (b = bals; b < &bals[n_bals]; b++) { b->iface = port->ifaces[b - bals]; b->tx_bytes = 0; b->hashes = NULL; b->n_hashes = 0; } for (i = 0; i <= BOND_MASK; i++) { hashes[i] = &port->bond_hash[i]; } qsort(hashes, BOND_MASK + 1, sizeof *hashes, compare_bond_entries); for (i = 0; i <= BOND_MASK; i++) { e = hashes[i]; if (e->iface_idx >= 0 && e->iface_idx < port->n_ifaces) { b = &bals[e->iface_idx]; b->tx_bytes += e->tx_bytes; if (!b->hashes) { b->hashes = &hashes[i]; } b->n_hashes++; } } qsort(bals, n_bals, sizeof *bals, compare_slave_balance); log_bals(bals, n_bals, port); /* Discard slaves that aren't enabled (which were sorted to the back of the * array earlier). */ while (!bals[n_bals - 1].iface->enabled) { n_bals--; if (!n_bals) { return; } } /* Shift load from the most-loaded slaves to the least-loaded slaves. */ to = &bals[n_bals - 1]; for (from = bals; from < to; ) { uint64_t overload = from->tx_bytes - to->tx_bytes; if (overload < to->tx_bytes >> 5 || overload < 100000) { /* The extra load on 'from' (and all less-loaded slaves), compared * to that of 'to' (the least-loaded slave), is less than ~3%, or * it is less than ~1Mbps. No point in rebalancing. */ break; } else if (from->n_hashes == 1) { /* 'from' only carries a single MAC hash, so we can't shift any * load away from it, even though we want to. */ from++; } else { /* 'from' is carrying significantly more load than 'to', and that * load is split across at least two different hashes. Pick a hash * to migrate to 'to' (the least-loaded slave), given that doing so * must decrease the ratio of the load on the two slaves by at * least 0.1. * * The sort order we use means that we prefer to shift away the * smallest hashes instead of the biggest ones. There is little * reason behind this decision; we could use the opposite sort * order to shift away big hashes ahead of small ones. */ size_t i; bool order_swapped; for (i = 0; i < from->n_hashes; i++) { double old_ratio, new_ratio; uint64_t delta = from->hashes[i]->tx_bytes; if (delta == 0 || from->tx_bytes - delta == 0) { /* Pointless move. */ continue; } order_swapped = from->tx_bytes - delta < to->tx_bytes + delta; if (to->tx_bytes == 0) { /* Nothing on the new slave, move it. */ break; } old_ratio = (double)from->tx_bytes / to->tx_bytes; new_ratio = (double)(from->tx_bytes - delta) / (to->tx_bytes + delta); if (new_ratio == 0) { /* Should already be covered but check to prevent division * by zero. */ continue; } if (new_ratio < 1) { new_ratio = 1 / new_ratio; } if (old_ratio - new_ratio > 0.1) { /* Would decrease the ratio, move it. */ break; } } if (i < from->n_hashes) { bond_shift_load(from, to, i); port->bond_compat_is_stale = true; /* If the result of the migration changed the relative order of * 'from' and 'to' swap them back to maintain invariants. */ if (order_swapped) { swap_bals(from, to); } /* Re-sort 'bals'. Note that this may make 'from' and 'to' * point to different slave_balance structures. It is only * valid to do these two operations in a row at all because we * know that 'from' will not move past 'to' and vice versa. */ resort_bals(from, bals, n_bals); resort_bals(to, bals, n_bals); } else { from++; } } } /* Implement exponentially weighted moving average. A weight of 1/2 causes * historical data to decay to <1% in 7 rebalancing runs. */ for (e = &port->bond_hash[0]; e <= &port->bond_hash[BOND_MASK]; e++) { e->tx_bytes /= 2; } } static void bond_send_learning_packets(struct port *port) { struct bridge *br = port->bridge; struct mac_entry *e; struct ofpbuf packet; int error, n_packets, n_errors; if (!port->n_ifaces || port->active_iface < 0) { return; } ofpbuf_init(&packet, 128); error = n_packets = n_errors = 0; LIST_FOR_EACH (e, struct mac_entry, lru_node, &br->ml->lrus) { union ofp_action actions[2], *a; uint16_t dp_ifidx; tag_type tags = 0; flow_t flow; int retval; if (e->port == port->port_idx || !choose_output_iface(port, e->mac, &dp_ifidx, &tags)) { continue; } /* Compose actions. */ memset(actions, 0, sizeof actions); a = actions; if (e->vlan) { a->vlan_vid.type = htons(OFPAT_SET_VLAN_VID); a->vlan_vid.len = htons(sizeof *a); a->vlan_vid.vlan_vid = htons(e->vlan); a++; } a->output.type = htons(OFPAT_OUTPUT); a->output.len = htons(sizeof *a); a->output.port = htons(odp_port_to_ofp_port(dp_ifidx)); a++; /* Send packet. */ n_packets++; compose_benign_packet(&packet, "Open vSwitch Bond Failover", 0xf177, e->mac); flow_extract(&packet, ODPP_NONE, &flow); retval = ofproto_send_packet(br->ofproto, &flow, actions, a - actions, &packet); if (retval) { error = retval; n_errors++; } } ofpbuf_uninit(&packet); if (n_errors) { static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); VLOG_WARN_RL(&rl, "bond %s: %d errors sending %d gratuitous learning " "packets, last error was: %s", port->name, n_errors, n_packets, strerror(error)); } else { VLOG_DBG("bond %s: sent %d gratuitous learning packets", port->name, n_packets); } } /* Bonding unixctl user interface functions. */ static void bond_unixctl_list(struct unixctl_conn *conn, const char *args UNUSED) { struct ds ds = DS_EMPTY_INITIALIZER; const struct bridge *br; ds_put_cstr(&ds, "bridge\tbond\tslaves\n"); LIST_FOR_EACH (br, struct bridge, node, &all_bridges) { size_t i; for (i = 0; i < br->n_ports; i++) { const struct port *port = br->ports[i]; if (port->n_ifaces > 1) { size_t j; ds_put_format(&ds, "%s\t%s\t", br->name, port->name); for (j = 0; j < port->n_ifaces; j++) { const struct iface *iface = port->ifaces[j]; if (j) { ds_put_cstr(&ds, ", "); } ds_put_cstr(&ds, iface->name); } ds_put_char(&ds, '\n'); } } } unixctl_command_reply(conn, 200, ds_cstr(&ds)); ds_destroy(&ds); } static struct port * bond_find(const char *name) { const struct bridge *br; LIST_FOR_EACH (br, struct bridge, node, &all_bridges) { size_t i; for (i = 0; i < br->n_ports; i++) { struct port *port = br->ports[i]; if (!strcmp(port->name, name) && port->n_ifaces > 1) { return port; } } } return NULL; } static void bond_unixctl_show(struct unixctl_conn *conn, const char *args) { struct ds ds = DS_EMPTY_INITIALIZER; const struct port *port; size_t j; port = bond_find(args); if (!port) { unixctl_command_reply(conn, 501, "no such bond"); return; } ds_put_format(&ds, "updelay: %d ms\n", port->updelay); ds_put_format(&ds, "downdelay: %d ms\n", port->downdelay); ds_put_format(&ds, "next rebalance: %lld ms\n", port->bridge->bond_next_rebalance - time_msec()); for (j = 0; j < port->n_ifaces; j++) { const struct iface *iface = port->ifaces[j]; struct bond_entry *be; /* Basic info. */ ds_put_format(&ds, "slave %s: %s\n", iface->name, iface->enabled ? "enabled" : "disabled"); if (j == port->active_iface) { ds_put_cstr(&ds, "\tactive slave\n"); } if (iface->delay_expires != LLONG_MAX) { ds_put_format(&ds, "\t%s expires in %lld ms\n", iface->enabled ? "downdelay" : "updelay", iface->delay_expires - time_msec()); } /* Hashes. */ for (be = port->bond_hash; be <= &port->bond_hash[BOND_MASK]; be++) { int hash = be - port->bond_hash; struct mac_entry *me; if (be->iface_idx != j) { continue; } ds_put_format(&ds, "\thash %d: %"PRIu64" kB load\n", hash, be->tx_bytes / 1024); /* MACs. */ LIST_FOR_EACH (me, struct mac_entry, lru_node, &port->bridge->ml->lrus) { uint16_t dp_ifidx; tag_type tags = 0; if (bond_hash(me->mac) == hash && me->port != port->port_idx && choose_output_iface(port, me->mac, &dp_ifidx, &tags) && dp_ifidx == iface->dp_ifidx) { ds_put_format(&ds, "\t\t"ETH_ADDR_FMT"\n", ETH_ADDR_ARGS(me->mac)); } } } } unixctl_command_reply(conn, 200, ds_cstr(&ds)); ds_destroy(&ds); } static void bond_unixctl_migrate(struct unixctl_conn *conn, const char *args_) { char *args = (char *) args_; char *save_ptr = NULL; char *bond_s, *hash_s, *slave_s; uint8_t mac[ETH_ADDR_LEN]; struct port *port; struct iface *iface; struct bond_entry *entry; int hash; bond_s = strtok_r(args, " ", &save_ptr); hash_s = strtok_r(NULL, " ", &save_ptr); slave_s = strtok_r(NULL, " ", &save_ptr); if (!slave_s) { unixctl_command_reply(conn, 501, "usage: bond/migrate BOND HASH SLAVE"); return; } port = bond_find(bond_s); if (!port) { unixctl_command_reply(conn, 501, "no such bond"); return; } if (sscanf(hash_s, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(mac)) == ETH_ADDR_SCAN_COUNT) { hash = bond_hash(mac); } else if (strspn(hash_s, "0123456789") == strlen(hash_s)) { hash = atoi(hash_s) & BOND_MASK; } else { unixctl_command_reply(conn, 501, "bad hash"); return; } iface = port_lookup_iface(port, slave_s); if (!iface) { unixctl_command_reply(conn, 501, "no such slave"); return; } if (!iface->enabled) { unixctl_command_reply(conn, 501, "cannot migrate to disabled slave"); return; } entry = &port->bond_hash[hash]; ofproto_revalidate(port->bridge->ofproto, entry->iface_tag); entry->iface_idx = iface->port_ifidx; entry->iface_tag = tag_create_random(); port->bond_compat_is_stale = true; unixctl_command_reply(conn, 200, "migrated"); } static void bond_unixctl_set_active_slave(struct unixctl_conn *conn, const char *args_) { char *args = (char *) args_; char *save_ptr = NULL; char *bond_s, *slave_s; struct port *port; struct iface *iface; bond_s = strtok_r(args, " ", &save_ptr); slave_s = strtok_r(NULL, " ", &save_ptr); if (!slave_s) { unixctl_command_reply(conn, 501, "usage: bond/set-active-slave BOND SLAVE"); return; } port = bond_find(bond_s); if (!port) { unixctl_command_reply(conn, 501, "no such bond"); return; } iface = port_lookup_iface(port, slave_s); if (!iface) { unixctl_command_reply(conn, 501, "no such slave"); return; } if (!iface->enabled) { unixctl_command_reply(conn, 501, "cannot make disabled slave active"); return; } if (port->active_iface != iface->port_ifidx) { ofproto_revalidate(port->bridge->ofproto, port->active_iface_tag); port->active_iface = iface->port_ifidx; port->active_iface_tag = tag_create_random(); VLOG_INFO("port %s: active interface is now %s", port->name, iface->name); bond_send_learning_packets(port); unixctl_command_reply(conn, 200, "done"); } else { unixctl_command_reply(conn, 200, "no change"); } } static void enable_slave(struct unixctl_conn *conn, const char *args_, bool enable) { char *args = (char *) args_; char *save_ptr = NULL; char *bond_s, *slave_s; struct port *port; struct iface *iface; bond_s = strtok_r(args, " ", &save_ptr); slave_s = strtok_r(NULL, " ", &save_ptr); if (!slave_s) { unixctl_command_reply(conn, 501, "usage: bond/enable/disable-slave BOND SLAVE"); return; } port = bond_find(bond_s); if (!port) { unixctl_command_reply(conn, 501, "no such bond"); return; } iface = port_lookup_iface(port, slave_s); if (!iface) { unixctl_command_reply(conn, 501, "no such slave"); return; } bond_enable_slave(iface, enable); unixctl_command_reply(conn, 501, enable ? "enabled" : "disabled"); } static void bond_unixctl_enable_slave(struct unixctl_conn *conn, const char *args) { enable_slave(conn, args, true); } static void bond_unixctl_disable_slave(struct unixctl_conn *conn, const char *args) { enable_slave(conn, args, false); } static void bond_unixctl_hash(struct unixctl_conn *conn, const char *args) { uint8_t mac[ETH_ADDR_LEN]; uint8_t hash; char *hash_cstr; if (sscanf(args, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(mac)) == ETH_ADDR_SCAN_COUNT) { hash = bond_hash(mac); hash_cstr = xasprintf("%u", hash); unixctl_command_reply(conn, 200, hash_cstr); free(hash_cstr); } else { unixctl_command_reply(conn, 501, "invalid mac"); } } static void bond_init(void) { unixctl_command_register("bond/list", bond_unixctl_list); unixctl_command_register("bond/show", bond_unixctl_show); unixctl_command_register("bond/migrate", bond_unixctl_migrate); unixctl_command_register("bond/set-active-slave", bond_unixctl_set_active_slave); unixctl_command_register("bond/enable-slave", bond_unixctl_enable_slave); unixctl_command_register("bond/disable-slave", bond_unixctl_disable_slave); unixctl_command_register("bond/hash", bond_unixctl_hash); } /* Port functions. */ static void port_create(struct bridge *br, const char *name) { struct port *port; port = xcalloc(1, sizeof *port); port->bridge = br; port->port_idx = br->n_ports; port->vlan = -1; port->trunks = NULL; port->name = xstrdup(name); port->active_iface = -1; port->stp_state = STP_DISABLED; port->stp_state_tag = 0; if (br->n_ports >= br->allocated_ports) { br->ports = x2nrealloc(br->ports, &br->allocated_ports, sizeof *br->ports); } br->ports[br->n_ports++] = port; VLOG_INFO("created port %s on bridge %s", port->name, br->name); bridge_flush(br); } static void port_reconfigure(struct port *port) { bool bonded = cfg_has_section("bonding.%s", port->name); struct svec old_ifaces, new_ifaces; unsigned long *trunks; int vlan; size_t i; /* Collect old and new interfaces. */ svec_init(&old_ifaces); svec_init(&new_ifaces); for (i = 0; i < port->n_ifaces; i++) { svec_add(&old_ifaces, port->ifaces[i]->name); } svec_sort(&old_ifaces); if (bonded) { cfg_get_all_keys(&new_ifaces, "bonding.%s.slave", port->name); if (!new_ifaces.n) { VLOG_ERR("port %s: no interfaces specified for bonded port", port->name); } else if (new_ifaces.n == 1) { VLOG_WARN("port %s: only 1 interface specified for bonded port", port->name); } port->updelay = cfg_get_int(0, "bonding.%s.updelay", port->name); if (port->updelay < 0) { port->updelay = 0; } port->downdelay = cfg_get_int(0, "bonding.%s.downdelay", port->name); if (port->downdelay < 0) { port->downdelay = 0; } } else { svec_init(&new_ifaces); svec_add(&new_ifaces, port->name); } /* Get rid of deleted interfaces and add new interfaces. */ for (i = 0; i < port->n_ifaces; i++) { struct iface *iface = port->ifaces[i]; if (!svec_contains(&new_ifaces, iface->name)) { iface_destroy(iface); } else { i++; } } for (i = 0; i < new_ifaces.n; i++) { const char *name = new_ifaces.names[i]; if (!svec_contains(&old_ifaces, name)) { iface_create(port, name); } } /* Get VLAN tag. */ vlan = -1; if (cfg_has("vlan.%s.tag", port->name)) { if (!bonded) { vlan = cfg_get_vlan(0, "vlan.%s.tag", port->name); if (vlan >= 0 && vlan <= 4095) { VLOG_DBG("port %s: assigning VLAN tag %d", port->name, vlan); } } else { /* It's possible that bonded, VLAN-tagged ports make sense. Maybe * they even work as-is. But they have not been tested. */ VLOG_WARN("port %s: VLAN tags not supported on bonded ports", port->name); } } if (port->vlan != vlan) { port->vlan = vlan; bridge_flush(port->bridge); } /* Get trunked VLANs. */ trunks = NULL; if (vlan < 0) { size_t n_trunks, n_errors; size_t i; trunks = bitmap_allocate(4096); n_trunks = cfg_count("vlan.%s.trunks", port->name); n_errors = 0; for (i = 0; i < n_trunks; i++) { int trunk = cfg_get_vlan(i, "vlan.%s.trunks", port->name); if (trunk >= 0) { bitmap_set1(trunks, trunk); } else { n_errors++; } } if (n_errors) { VLOG_ERR("port %s: invalid values for %zu trunk VLANs", port->name, n_trunks); } if (n_errors == n_trunks) { if (n_errors) { VLOG_ERR("port %s: no valid trunks, trunking all VLANs", port->name); } bitmap_set_multiple(trunks, 0, 4096, 1); } } else { if (cfg_has("vlan.%s.trunks", port->name)) { VLOG_ERR("ignoring vlan.%s.trunks in favor of vlan.%s.vlan", port->name, port->name); } } if (trunks == NULL ? port->trunks != NULL : port->trunks == NULL || !bitmap_equal(trunks, port->trunks, 4096)) { bridge_flush(port->bridge); } bitmap_free(port->trunks); port->trunks = trunks; svec_destroy(&old_ifaces); svec_destroy(&new_ifaces); } static void port_destroy(struct port *port) { if (port) { struct bridge *br = port->bridge; struct port *del; size_t i; proc_net_compat_update_vlan(port->name, NULL, 0); proc_net_compat_update_bond(port->name, NULL); for (i = 0; i < MAX_MIRRORS; i++) { struct mirror *m = br->mirrors[i]; if (m && m->out_port == port) { mirror_destroy(m); } } while (port->n_ifaces > 0) { iface_destroy(port->ifaces[port->n_ifaces - 1]); } del = br->ports[port->port_idx] = br->ports[--br->n_ports]; del->port_idx = port->port_idx; free(port->ifaces); bitmap_free(port->trunks); free(port->name); free(port); bridge_flush(br); } } static struct port * port_from_dp_ifidx(const struct bridge *br, uint16_t dp_ifidx) { struct iface *iface = iface_from_dp_ifidx(br, dp_ifidx); return iface ? iface->port : NULL; } static struct port * port_lookup(const struct bridge *br, const char *name) { size_t i; for (i = 0; i < br->n_ports; i++) { struct port *port = br->ports[i]; if (!strcmp(port->name, name)) { return port; } } return NULL; } static struct iface * port_lookup_iface(const struct port *port, const char *name) { size_t j; for (j = 0; j < port->n_ifaces; j++) { struct iface *iface = port->ifaces[j]; if (!strcmp(iface->name, name)) { return iface; } } return NULL; } static void port_update_bonding(struct port *port) { if (port->n_ifaces < 2) { /* Not a bonded port. */ if (port->bond_hash) { free(port->bond_hash); port->bond_hash = NULL; port->bond_compat_is_stale = true; } } else { if (!port->bond_hash) { size_t i; port->bond_hash = xcalloc(BOND_MASK + 1, sizeof *port->bond_hash); for (i = 0; i <= BOND_MASK; i++) { struct bond_entry *e = &port->bond_hash[i]; e->iface_idx = -1; e->tx_bytes = 0; } port->no_ifaces_tag = tag_create_random(); bond_choose_active_iface(port); } port->bond_compat_is_stale = true; } } static void port_update_bond_compat(struct port *port) { struct compat_bond_hash compat_hashes[BOND_MASK + 1]; struct compat_bond bond; size_t i; if (port->n_ifaces < 2) { proc_net_compat_update_bond(port->name, NULL); return; } bond.up = false; bond.updelay = port->updelay; bond.downdelay = port->downdelay; bond.n_hashes = 0; bond.hashes = compat_hashes; if (port->bond_hash) { const struct bond_entry *e; for (e = port->bond_hash; e <= &port->bond_hash[BOND_MASK]; e++) { if (e->iface_idx >= 0 && e->iface_idx < port->n_ifaces) { struct compat_bond_hash *cbh = &bond.hashes[bond.n_hashes++]; cbh->hash = e - port->bond_hash; cbh->netdev_name = port->ifaces[e->iface_idx]->name; } } } bond.n_slaves = port->n_ifaces; bond.slaves = xmalloc(port->n_ifaces * sizeof *bond.slaves); for (i = 0; i < port->n_ifaces; i++) { struct iface *iface = port->ifaces[i]; struct compat_bond_slave *slave = &bond.slaves[i]; slave->name = iface->name; /* We need to make the same determination as the Linux bonding * code to determine whether a slave should be consider "up". * The Linux function bond_miimon_inspect() supports four * BOND_LINK_* states: * * - BOND_LINK_UP: carrier detected, updelay has passed. * - BOND_LINK_FAIL: carrier lost, downdelay in progress. * - BOND_LINK_DOWN: carrier lost, downdelay has passed. * - BOND_LINK_BACK: carrier detected, updelay in progress. * * The function bond_info_show_slave() only considers BOND_LINK_UP * to be "up" and anything else to be "down". */ slave->up = iface->enabled && iface->delay_expires == LLONG_MAX; if (slave->up) { bond.up = true; } netdev_get_etheraddr(iface->netdev, slave->mac); } if (cfg_get_bool(0, "bonding.%s.fake-iface", port->name)) { struct netdev *bond_netdev; if (!netdev_open(port->name, NETDEV_ETH_TYPE_NONE, &bond_netdev)) { if (bond.up) { netdev_turn_flags_on(bond_netdev, NETDEV_UP, true); } else { netdev_turn_flags_off(bond_netdev, NETDEV_UP, true); } netdev_close(bond_netdev); } } proc_net_compat_update_bond(port->name, &bond); free(bond.slaves); } static void port_update_vlan_compat(struct port *port) { struct bridge *br = port->bridge; char *vlandev_name = NULL; if (port->vlan > 0) { /* Figure out the name that the VLAN device should actually have, if it * existed. This takes some work because the VLAN device would not * have port->name in its name; rather, it would have the trunk port's * name, and 'port' would be attached to a bridge that also had the * VLAN device one of its ports. So we need to find a trunk port that * includes port->vlan. * * There might be more than one candidate. This doesn't happen on * XenServer, so if it happens we just pick the first choice in * alphabetical order instead of creating multiple VLAN devices. */ size_t i; for (i = 0; i < br->n_ports; i++) { struct port *p = br->ports[i]; if (port_trunks_vlan(p, port->vlan) && p->n_ifaces && (!vlandev_name || strcmp(p->name, vlandev_name) <= 0)) { uint8_t ea[ETH_ADDR_LEN]; netdev_get_etheraddr(p->ifaces[0]->netdev, ea); if (!eth_addr_is_multicast(ea) && !eth_addr_is_reserved(ea) && !eth_addr_is_zero(ea)) { vlandev_name = p->name; } } } } proc_net_compat_update_vlan(port->name, vlandev_name, port->vlan); } /* Interface functions. */ static void iface_create(struct port *port, const char *name) { struct iface *iface; iface = xcalloc(1, sizeof *iface); iface->port = port; iface->port_ifidx = port->n_ifaces; iface->name = xstrdup(name); iface->dp_ifidx = -1; iface->tag = tag_create_random(); iface->delay_expires = LLONG_MAX; iface->netdev = NULL; if (port->n_ifaces >= port->allocated_ifaces) { port->ifaces = x2nrealloc(port->ifaces, &port->allocated_ifaces, sizeof *port->ifaces); } port->ifaces[port->n_ifaces++] = iface; if (port->n_ifaces > 1) { port->bridge->has_bonded_ports = true; } VLOG_DBG("attached network device %s to port %s", iface->name, port->name); bridge_flush(port->bridge); } static void iface_destroy(struct iface *iface) { if (iface) { struct port *port = iface->port; struct bridge *br = port->bridge; bool del_active = port->active_iface == iface->port_ifidx; struct iface *del; if (iface->dp_ifidx >= 0) { port_array_set(&br->ifaces, iface->dp_ifidx, NULL); } del = port->ifaces[iface->port_ifidx] = port->ifaces[--port->n_ifaces]; del->port_ifidx = iface->port_ifidx; netdev_close(iface->netdev); free(iface->name); free(iface); if (del_active) { ofproto_revalidate(port->bridge->ofproto, port->active_iface_tag); bond_choose_active_iface(port); bond_send_learning_packets(port); } bridge_flush(port->bridge); } } static struct iface * iface_lookup(const struct bridge *br, const char *name) { size_t i, j; for (i = 0; i < br->n_ports; i++) { struct port *port = br->ports[i]; for (j = 0; j < port->n_ifaces; j++) { struct iface *iface = port->ifaces[j]; if (!strcmp(iface->name, name)) { return iface; } } } return NULL; } static struct iface * iface_from_dp_ifidx(const struct bridge *br, uint16_t dp_ifidx) { return port_array_get(&br->ifaces, dp_ifidx); } /* Returns true if 'iface' is the name of an "internal" interface on bridge * 'br', that is, an interface that is entirely simulated within the datapath. * The local port (ODPP_LOCAL) is always an internal interface. Other local * interfaces are created by setting "iface..internal = true". * * In addition, we have a kluge-y feature that creates an internal port with * the name of a bonded port if "bonding..fake-iface = true" is set. * This feature needs to go away in the long term. Until then, this is one * reason why this function takes a name instead of a struct iface: the fake * interfaces created this way do not have a struct iface. */ static bool iface_is_internal(const struct bridge *br, const char *iface) { if (!strcmp(iface, br->name) || cfg_get_bool(0, "iface.%s.internal", iface)) { return true; } if (cfg_get_bool(0, "bonding.%s.fake-iface", iface)) { struct port *port = port_lookup(br, iface); if (port && port->n_ifaces > 1) { return true; } } return false; } /* Set Ethernet address of 'iface', if one is specified in the configuration * file. */ static void iface_set_mac(struct iface *iface) { uint64_t mac = cfg_get_mac(0, "iface.%s.mac", iface->name); if (mac) { static uint8_t ea[ETH_ADDR_LEN]; eth_addr_from_uint64(mac, ea); if (eth_addr_is_multicast(ea)) { VLOG_ERR("interface %s: cannot set MAC to multicast address", iface->name); } else if (iface->dp_ifidx == ODPP_LOCAL) { VLOG_ERR("ignoring iface.%s.mac; use bridge.%s.mac instead", iface->name, iface->name); } else { int error = netdev_set_etheraddr(iface->netdev, ea); if (error) { VLOG_ERR("interface %s: setting MAC failed (%s)", iface->name, strerror(error)); } } } } /* Port mirroring. */ static void mirror_reconfigure(struct bridge *br) { struct svec old_mirrors, new_mirrors; size_t i, n_rspan_vlans; unsigned long *rspan_vlans; /* Collect old and new mirrors. */ svec_init(&old_mirrors); svec_init(&new_mirrors); cfg_get_subsections(&new_mirrors, "mirror.%s", br->name); for (i = 0; i < MAX_MIRRORS; i++) { if (br->mirrors[i]) { svec_add(&old_mirrors, br->mirrors[i]->name); } } /* Get rid of deleted mirrors and add new mirrors. */ svec_sort(&old_mirrors); assert(svec_is_unique(&old_mirrors)); svec_sort(&new_mirrors); assert(svec_is_unique(&new_mirrors)); for (i = 0; i < MAX_MIRRORS; i++) { struct mirror *m = br->mirrors[i]; if (m && !svec_contains(&new_mirrors, m->name)) { mirror_destroy(m); } } for (i = 0; i < new_mirrors.n; i++) { const char *name = new_mirrors.names[i]; if (!svec_contains(&old_mirrors, name)) { mirror_create(br, name); } } svec_destroy(&old_mirrors); svec_destroy(&new_mirrors); /* Reconfigure all mirrors. */ for (i = 0; i < MAX_MIRRORS; i++) { if (br->mirrors[i]) { mirror_reconfigure_one(br->mirrors[i]); } } /* Update port reserved status. */ for (i = 0; i < br->n_ports; i++) { br->ports[i]->is_mirror_output_port = false; } for (i = 0; i < MAX_MIRRORS; i++) { struct mirror *m = br->mirrors[i]; if (m && m->out_port) { m->out_port->is_mirror_output_port = true; } } /* Update learning disabled vlans (for RSPAN). */ rspan_vlans = NULL; n_rspan_vlans = cfg_count("vlan.%s.disable-learning", br->name); if (n_rspan_vlans) { rspan_vlans = bitmap_allocate(4096); for (i = 0; i < n_rspan_vlans; i++) { int vlan = cfg_get_vlan(i, "vlan.%s.disable-learning", br->name); if (vlan >= 0) { bitmap_set1(rspan_vlans, vlan); VLOG_INFO("bridge %s: disabling learning on vlan %d\n", br->name, vlan); } else { VLOG_ERR("bridge %s: invalid value '%s' for learning disabled " "VLAN", br->name, cfg_get_string(i, "vlan.%s.disable-learning", br->name)); } } } if (mac_learning_set_disabled_vlans(br->ml, rspan_vlans)) { bridge_flush(br); } } static void mirror_create(struct bridge *br, const char *name) { struct mirror *m; size_t i; for (i = 0; ; i++) { if (i >= MAX_MIRRORS) { VLOG_WARN("bridge %s: maximum of %d port mirrors reached, " "cannot create %s", br->name, MAX_MIRRORS, name); return; } if (!br->mirrors[i]) { break; } } VLOG_INFO("created port mirror %s on bridge %s", name, br->name); bridge_flush(br); br->mirrors[i] = m = xcalloc(1, sizeof *m); m->bridge = br; m->idx = i; m->name = xstrdup(name); svec_init(&m->src_ports); svec_init(&m->dst_ports); m->vlans = NULL; m->n_vlans = 0; m->out_vlan = -1; m->out_port = NULL; } static void mirror_destroy(struct mirror *m) { if (m) { struct bridge *br = m->bridge; size_t i; for (i = 0; i < br->n_ports; i++) { br->ports[i]->src_mirrors &= ~(MIRROR_MASK_C(1) << m->idx); br->ports[i]->dst_mirrors &= ~(MIRROR_MASK_C(1) << m->idx); } svec_destroy(&m->src_ports); svec_destroy(&m->dst_ports); free(m->vlans); m->bridge->mirrors[m->idx] = NULL; free(m); bridge_flush(br); } } static void prune_ports(struct mirror *m, struct svec *ports) { struct svec tmp; size_t i; svec_sort_unique(ports); svec_init(&tmp); for (i = 0; i < ports->n; i++) { const char *name = ports->names[i]; if (port_lookup(m->bridge, name)) { svec_add(&tmp, name); } else { VLOG_WARN("mirror.%s.%s: cannot match on nonexistent port %s", m->bridge->name, m->name, name); } } svec_swap(ports, &tmp); svec_destroy(&tmp); } static size_t prune_vlans(struct mirror *m, struct svec *vlan_strings, int **vlans) { size_t n_vlans, i; /* This isn't perfect: it won't combine "0" and "00", and the textual sort * order won't give us numeric sort order. But that's good enough for what * we need right now. */ svec_sort_unique(vlan_strings); *vlans = xmalloc(sizeof *vlans * vlan_strings->n); n_vlans = 0; for (i = 0; i < vlan_strings->n; i++) { const char *name = vlan_strings->names[i]; int vlan; if (!str_to_int(name, 10, &vlan) || vlan < 0 || vlan > 4095) { VLOG_WARN("mirror.%s.%s.select.vlan: ignoring invalid VLAN %s", m->bridge->name, m->name, name); } else { (*vlans)[n_vlans++] = vlan; } } return n_vlans; } static bool vlan_is_mirrored(const struct mirror *m, int vlan) { size_t i; for (i = 0; i < m->n_vlans; i++) { if (m->vlans[i] == vlan) { return true; } } return false; } static bool port_trunks_any_mirrored_vlan(const struct mirror *m, const struct port *p) { size_t i; for (i = 0; i < m->n_vlans; i++) { if (port_trunks_vlan(p, m->vlans[i])) { return true; } } return false; } static void mirror_reconfigure_one(struct mirror *m) { char *pfx = xasprintf("mirror.%s.%s", m->bridge->name, m->name); struct svec src_ports, dst_ports, ports; struct svec vlan_strings; mirror_mask_t mirror_bit; const char *out_port_name; struct port *out_port; int out_vlan; size_t n_vlans; int *vlans; size_t i; bool mirror_all_ports; bool any_ports_specified; /* Get output port. */ out_port_name = cfg_get_key(0, "mirror.%s.%s.output.port", m->bridge->name, m->name); if (out_port_name) { out_port = port_lookup(m->bridge, out_port_name); if (!out_port) { VLOG_ERR("%s.output.port: bridge %s does not have a port " "named %s", pfx, m->bridge->name, out_port_name); mirror_destroy(m); free(pfx); return; } out_vlan = -1; if (cfg_has("%s.output.vlan", pfx)) { VLOG_ERR("%s.output.port and %s.output.vlan both specified; " "ignoring %s.output.vlan", pfx, pfx, pfx); } } else if (cfg_has("%s.output.vlan", pfx)) { out_port = NULL; out_vlan = cfg_get_vlan(0, "%s.output.vlan", pfx); } else { VLOG_ERR("%s: neither %s.output.port nor %s.output.vlan specified, " "but exactly one is required; disabling port mirror %s", pfx, pfx, pfx, pfx); mirror_destroy(m); free(pfx); return; } /* Get all the ports, and drop duplicates and ports that don't exist. */ svec_init(&src_ports); svec_init(&dst_ports); svec_init(&ports); cfg_get_all_keys(&src_ports, "%s.select.src-port", pfx); cfg_get_all_keys(&dst_ports, "%s.select.dst-port", pfx); cfg_get_all_keys(&ports, "%s.select.port", pfx); any_ports_specified = src_ports.n || dst_ports.n || ports.n; svec_append(&src_ports, &ports); svec_append(&dst_ports, &ports); svec_destroy(&ports); prune_ports(m, &src_ports); prune_ports(m, &dst_ports); if (any_ports_specified && !src_ports.n && !dst_ports.n) { VLOG_ERR("%s: none of the specified ports exist; " "disabling port mirror %s", pfx, pfx); mirror_destroy(m); goto exit; } /* Get all the vlans, and drop duplicate and invalid vlans. */ svec_init(&vlan_strings); cfg_get_all_keys(&vlan_strings, "%s.select.vlan", pfx); n_vlans = prune_vlans(m, &vlan_strings, &vlans); svec_destroy(&vlan_strings); /* Update mirror data. */ if (!svec_equal(&m->src_ports, &src_ports) || !svec_equal(&m->dst_ports, &dst_ports) || m->n_vlans != n_vlans || memcmp(m->vlans, vlans, sizeof *vlans * n_vlans) || m->out_port != out_port || m->out_vlan != out_vlan) { bridge_flush(m->bridge); } svec_swap(&m->src_ports, &src_ports); svec_swap(&m->dst_ports, &dst_ports); free(m->vlans); m->vlans = vlans; m->n_vlans = n_vlans; m->out_port = out_port; m->out_vlan = out_vlan; /* If no selection criteria have been given, mirror for all ports. */ mirror_all_ports = (!m->src_ports.n) && (!m->dst_ports.n) && (!m->n_vlans); /* Update ports. */ mirror_bit = MIRROR_MASK_C(1) << m->idx; for (i = 0; i < m->bridge->n_ports; i++) { struct port *port = m->bridge->ports[i]; if (mirror_all_ports || svec_contains(&m->src_ports, port->name) || (m->n_vlans && (!port->vlan ? port_trunks_any_mirrored_vlan(m, port) : vlan_is_mirrored(m, port->vlan)))) { port->src_mirrors |= mirror_bit; } else { port->src_mirrors &= ~mirror_bit; } if (mirror_all_ports || svec_contains(&m->dst_ports, port->name)) { port->dst_mirrors |= mirror_bit; } else { port->dst_mirrors &= ~mirror_bit; } } /* Clean up. */ exit: svec_destroy(&src_ports); svec_destroy(&dst_ports); free(pfx); } /* Spanning tree protocol. */ static void brstp_update_port_state(struct port *); static void brstp_send_bpdu(struct ofpbuf *pkt, int port_no, void *br_) { struct bridge *br = br_; static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); struct iface *iface = iface_from_dp_ifidx(br, port_no); if (!iface) { VLOG_WARN_RL(&rl, "%s: cannot send BPDU on unknown port %d", br->name, port_no); } else { struct eth_header *eth = pkt->l2; netdev_get_etheraddr(iface->netdev, eth->eth_src); if (eth_addr_is_zero(eth->eth_src)) { VLOG_WARN_RL(&rl, "%s: cannot send BPDU on port %d " "with unknown MAC", br->name, port_no); } else { union ofp_action action; flow_t flow; memset(&action, 0, sizeof action); action.type = htons(OFPAT_OUTPUT); action.output.len = htons(sizeof action); action.output.port = htons(port_no); flow_extract(pkt, ODPP_NONE, &flow); ofproto_send_packet(br->ofproto, &flow, &action, 1, pkt); } } ofpbuf_delete(pkt); } static void brstp_reconfigure(struct bridge *br) { size_t i; if (!cfg_get_bool(0, "stp.%s.enabled", br->name)) { if (br->stp) { stp_destroy(br->stp); br->stp = NULL; bridge_flush(br); } } else { uint64_t bridge_address, bridge_id; int bridge_priority; bridge_address = cfg_get_mac(0, "stp.%s.address", br->name); if (!bridge_address) { if (br->stp) { bridge_address = (stp_get_bridge_id(br->stp) & ((UINT64_C(1) << 48) - 1)); } else { uint8_t mac[ETH_ADDR_LEN]; eth_addr_random(mac); bridge_address = eth_addr_to_uint64(mac); } } if (cfg_is_valid(CFG_INT | CFG_REQUIRED, "stp.%s.priority", br->name)) { bridge_priority = cfg_get_int(0, "stp.%s.priority", br->name); } else { bridge_priority = STP_DEFAULT_BRIDGE_PRIORITY; } bridge_id = bridge_address | ((uint64_t) bridge_priority << 48); if (!br->stp) { br->stp = stp_create(br->name, bridge_id, brstp_send_bpdu, br); br->stp_last_tick = time_msec(); bridge_flush(br); } else { if (bridge_id != stp_get_bridge_id(br->stp)) { stp_set_bridge_id(br->stp, bridge_id); bridge_flush(br); } } for (i = 0; i < br->n_ports; i++) { struct port *p = br->ports[i]; int dp_ifidx; struct stp_port *sp; int path_cost, priority; bool enable; if (!p->n_ifaces) { continue; } dp_ifidx = p->ifaces[0]->dp_ifidx; if (dp_ifidx < 0 || dp_ifidx >= STP_MAX_PORTS) { continue; } sp = stp_get_port(br->stp, dp_ifidx); enable = (!cfg_is_valid(CFG_BOOL | CFG_REQUIRED, "stp.%s.port.%s.enabled", br->name, p->name) || cfg_get_bool(0, "stp.%s.port.%s.enabled", br->name, p->name)); if (p->is_mirror_output_port) { enable = false; } if (enable != (stp_port_get_state(sp) != STP_DISABLED)) { bridge_flush(br); /* Might not be necessary. */ if (enable) { stp_port_enable(sp); } else { stp_port_disable(sp); } } path_cost = cfg_get_int(0, "stp.%s.port.%s.path-cost", br->name, p->name); stp_port_set_path_cost(sp, path_cost ? path_cost : 19 /* XXX */); priority = (cfg_is_valid(CFG_INT | CFG_REQUIRED, "stp.%s.port.%s.priority", br->name, p->name) ? cfg_get_int(0, "stp.%s.port.%s.priority", br->name, p->name) : STP_DEFAULT_PORT_PRIORITY); stp_port_set_priority(sp, priority); } brstp_adjust_timers(br); } for (i = 0; i < br->n_ports; i++) { brstp_update_port_state(br->ports[i]); } } static void brstp_update_port_state(struct port *p) { struct bridge *br = p->bridge; enum stp_state state; /* Figure out new state. */ state = STP_DISABLED; if (br->stp && p->n_ifaces > 0) { int dp_ifidx = p->ifaces[0]->dp_ifidx; if (dp_ifidx >= 0 && dp_ifidx < STP_MAX_PORTS) { state = stp_port_get_state(stp_get_port(br->stp, dp_ifidx)); } } /* Update state. */ if (p->stp_state != state) { static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 10); VLOG_INFO_RL(&rl, "port %s: STP state changed from %s to %s", p->name, stp_state_name(p->stp_state), stp_state_name(state)); if (p->stp_state == STP_DISABLED) { bridge_flush(br); } else { ofproto_revalidate(p->bridge->ofproto, p->stp_state_tag); } p->stp_state = state; p->stp_state_tag = (p->stp_state == STP_DISABLED ? 0 : tag_create_random()); } } static void brstp_adjust_timers(struct bridge *br) { int hello_time = cfg_get_int(0, "stp.%s.hello-time", br->name); int max_age = cfg_get_int(0, "stp.%s.max-age", br->name); int forward_delay = cfg_get_int(0, "stp.%s.forward-delay", br->name); stp_set_hello_time(br->stp, hello_time ? hello_time : 2000); stp_set_max_age(br->stp, max_age ? max_age : 20000); stp_set_forward_delay(br->stp, forward_delay ? forward_delay : 15000); } static void brstp_run(struct bridge *br) { if (br->stp) { long long int now = time_msec(); long long int elapsed = now - br->stp_last_tick; struct stp_port *sp; if (elapsed > 0) { stp_tick(br->stp, MIN(INT_MAX, elapsed)); br->stp_last_tick = now; } while (stp_get_changed_port(br->stp, &sp)) { struct port *p = port_from_dp_ifidx(br, stp_port_no(sp)); if (p) { brstp_update_port_state(p); } } } } static void brstp_wait(struct bridge *br) { if (br->stp) { poll_timer_wait(1000); } }