/* Copyright (c) 2008, 2009 Nicira Networks
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*
* In addition, as a special exception, Nicira Networks gives permission
* to link the code of its release of vswitchd with the OpenSSL project's
* "OpenSSL" library (or with modified versions of it that use the same
* license as the "OpenSSL" library), and distribute the linked
* executables. You must obey the GNU General Public License in all
* respects for all of the code used other than "OpenSSL". If you modify
* this file, you may extend this exception to your version of the file,
* but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version.
*
*/
#include
#include "bridge.h"
#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 "poll-loop.h"
#include "port-array.h"
#include "proc-net-compat.h"
#include "process.h"
#include "secchan/ofproto.h"
#include "socket-util.h"
#include "stp.h"
#include "svec.h"
#include "timeval.h"
#include "util.h"
#include "vconn.h"
#include "vconn-ssl.h"
#include "xenserver.h"
#include "xtoxll.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 {
struct port *port; /* Containing port. */
size_t port_ifidx; /* Index within containing port. */
char *name; /* Host network device name. */
int dp_ifidx; /* Index within kernel datapath. */
uint8_t mac[ETH_ADDR_LEN]; /* Ethernet address (all zeros if unknowns). */
tag_type tag; /* Tag associated with this interface. */
bool enabled; /* May be chosen for flows? */
long long delay_expires; /* Time after which 'enabled' may change. */
};
#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. */
/* 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, or null not to learn. */
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; /* Kernel 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 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],
const char **devname);
static uint64_t bridge_pick_datapath_id(struct bridge *,
const uint8_t bridge_ea[ETH_ADDR_LEN],
const char *devname);
static uint64_t dpid_from_hash(const void *, size_t nbytes);
static void bond_run(struct bridge *);
static void bond_wait(struct bridge *);
static void bond_rebalance_port(struct port *);
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 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 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);
/* 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 dp%u, ignoring",
iface->name, dpif_id(&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)
{
int retval;
int i;
for (i = 0; i < DP_MAX; i++) {
struct dpif dpif;
char devname[16];
sprintf(devname, "dp%d", i);
retval = dpif_open(devname, &dpif);
if (!retval) {
char dpif_name[IF_NAMESIZE];
if (dpif_get_name(&dpif, dpif_name, sizeof dpif_name)
|| !cfg_has("bridge.%s.port", dpif_name)) {
dpif_delete(&dpif);
}
dpif_close(&dpif);
} else if (retval != ENODEV) {
VLOG_ERR("failed to delete datapath dp%d: %s",
i, strerror(retval));
}
}
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;
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);
}
if (config_string_change("ssl.ca-cert", &cacert_file)) {
vconn_ssl_set_ca_cert_file(cacert_file,
cfg_get_bool(0, "ssl.bootstrap-ca-cert"));
}
}
#endif
void
bridge_reconfigure(void)
{
struct svec old_br, new_br, raw_new_br;
struct bridge *br, *next;
size_t i, j;
COVERAGE_INC(bridge_reconfigure);
/* Collect old bridges. */
svec_init(&old_br);
LIST_FOR_EACH (br, struct bridge, node, &all_bridges) {
svec_add(&old_br, br->name);
}
/* Collect new bridges. */
svec_init(&raw_new_br);
cfg_get_subsections(&raw_new_br, "bridge");
svec_init(&new_br);
for (i = 0; i < raw_new_br.n; i++) {
const char *name = raw_new_br.names[i];
if ((!strncmp(name, "dp", 2) && isdigit(name[2])) ||
(!strncmp(name, "nl:", 3) && isdigit(name[3]))) {
VLOG_ERR("%s is not a valid bridge name (bridges may not be "
"named \"dp\" or \"nl:\" followed by a digit)", name);
} else {
svec_add(&new_br, name);
}
}
svec_destroy(&raw_new_br);
/* 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 dp%u: %s",
p->devname, dpif_id(&br->dpif), strerror(retval));
}
}
}
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;
int next_port_no;
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);
next_port_no = 1;
for (i = 0; i < add_ifaces.n; i++) {
const char *if_name = add_ifaces.names[i];
for (;;) {
int internal = cfg_get_bool(0, "iface.%s.internal", if_name);
int error = dpif_port_add(&br->dpif, if_name, next_port_no++,
internal ? ODP_PORT_INTERNAL : 0);
if (error != EEXIST) {
if (next_port_no >= 256) {
VLOG_ERR("ran out of valid port numbers on dp%u",
dpif_id(&br->dpif));
goto out;
}
if (error) {
VLOG_ERR("failed to add %s interface to dp%u: %s",
if_name, dpif_id(&br->dpif), strerror(error));
}
break;
}
}
}
out:
svec_destroy(&cur_ifaces);
svec_destroy(&want_ifaces);
svec_destroy(&add_ifaces);
}
LIST_FOR_EACH (br, struct bridge, node, &all_bridges) {
uint8_t ea[8];
uint64_t dpid;
struct iface *local_iface = NULL;
const char *devname;
uint8_t engine_type = br->dpif.minor;
uint8_t engine_id = br->dpif.minor;
bool add_id_to_iface = false;
struct svec nf_hosts;
bridge_fetch_dp_ifaces(br);
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 (iface->dp_ifidx < 0) {
VLOG_ERR("%s interface not in dp%u, dropping",
iface->name, dpif_id(&br->dpif));
iface_destroy(iface);
} else {
if (iface->dp_ifidx == ODPP_LOCAL) {
local_iface = iface;
}
VLOG_DBG("dp%u has interface %s on port %d",
dpif_id(&br->dpif), iface->name, iface->dp_ifidx);
j++;
}
}
if (!port->n_ifaces) {
VLOG_ERR("%s port has no interfaces, dropping", port->name);
port_destroy(port);
continue;
}
i++;
}
/* Pick local port hardware address, datapath ID. */
bridge_pick_local_hw_addr(br, ea, &devname);
if (local_iface) {
int error = netdev_nodev_set_etheraddr(local_iface->name, 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, devname);
ofproto_set_datapath_id(br->ofproto, dpid);
/* Set NetFlow configuration on this bridge. */
if (cfg_has("netflow.%s.engine-type", br->name)) {
engine_type = cfg_get_int(0, "netflow.%s.engine-type",
br->name);
}
if (cfg_has("netflow.%s.engine-id", br->name)) {
engine_id = cfg_get_int(0, "netflow.%s.engine-id", br->name);
}
if (cfg_has("netflow.%s.add-id-to-iface", br->name)) {
add_id_to_iface = cfg_get_bool(0, "netflow.%s.add-id-to-iface",
br->name);
}
if (add_id_to_iface && 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 (add_id_to_iface && br->n_ports > 0x1ff) {
VLOG_WARN("bridge %s: netflow port mangling will conflict with "
"another port when 512 or more ports are used",
br->name);
}
svec_init(&nf_hosts);
cfg_get_all_keys(&nf_hosts, "netflow.%s.host", br->name);
if (ofproto_set_netflow(br->ofproto, &nf_hosts, engine_type,
engine_id, add_id_to_iface)) {
VLOG_ERR("bridge %s: problem setting netflow collectors",
br->name);
}
/* 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);
}
}
LIST_FOR_EACH (br, struct bridge, node, &all_bridges) {
brstp_reconfigure(br);
}
}
static void
bridge_pick_local_hw_addr(struct bridge *br, uint8_t ea[ETH_ADDR_LEN],
const char **devname)
{
uint64_t requested_ea;
size_t i, j;
int error;
*devname = 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];
if (port->is_mirror_output_port) {
continue;
}
for (j = 0; j < port->n_ifaces; j++) {
struct iface *iface = port->ifaces[j];
uint8_t iface_ea[ETH_ADDR_LEN];
if (iface->dp_ifidx == ODPP_LOCAL
|| cfg_get_bool(0, "iface.%s.internal", iface->name)) {
continue;
}
error = netdev_nodev_get_etheraddr(iface->name, iface_ea);
if (!error) {
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);
*devname = iface->name;
}
} else {
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));
}
}
}
if (eth_addr_is_multicast(ea) || eth_addr_is_vif(ea)) {
memcpy(ea, br->default_ea, ETH_ADDR_LEN);
*devname = 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
* a network device, then that network device's name must be passed in as
* 'devname'; if 'bridge_ea' was derived some other way, then 'devname' 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],
const char *devname)
{
/*
* 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 (devname) {
int vlan;
if (!netdev_get_vlan_vid(devname, &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[SHA1HashSize];
BUILD_ASSERT_DECL(sizeof hash >= ETH_ADDR_LEN);
SHA1Bytes(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;
}
if (br->ml) {
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;
if (br->ml) {
mac_learning_flush(br->ml);
}
}
/* 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(name, &br->dpif);
if (error == EEXIST) {
error = dpif_open(name, &br->dpif);
if (error) {
VLOG_ERR("datapath %s already exists but cannot be opened: %s",
name, strerror(error));
free(br);
return NULL;
}
dpif_flow_flush(&br->dpif);
} else if (error) {
VLOG_ERR("failed to create datapath %s: %s", name, strerror(error));
free(br);
return NULL;
}
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 dp%u", br->name, dpif_id(&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 dp%u: %s",
dpif_id(&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;
}
static int
bridge_run_one(struct bridge *br)
{
int error;
error = ofproto_run1(br->ofproto);
if (error) {
return error;
}
if (br->ml) {
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 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, j;
/* 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) && !svec_contains(&new_ports, br->name)) {
svec_add(&new_ports, br->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);
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 (svec_contains(&ifaces, iface->name)) {
VLOG_ERR("bridge %s: %s interface is on multiple ports, "
"removing from %s",
br->name, iface->name, port->name);
iface_destroy(iface);
} else {
svec_add(&ifaces, iface->name);
svec_sort(&ifaces);
j++;
}
}
if (!port->n_ifaces) {
VLOG_ERR("%s port has no interfaces, dropping", port->name);
port_destroy(port);
} else {
i++;
}
}
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")) {
ofproto_set_discovery(br->ofproto, true,
cfg_get_string(0, "%s.accept-regex", pfx),
cfg_get_bool(0, "%s.update-resolv.conf",
pfx));
} else {
struct netdev *netdev;
bool in_band;
int error;
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);
error = netdev_open(br->name, NETDEV_ETH_TYPE_NONE, &netdev);
if (!error) {
if (cfg_is_valid(CFG_IP | CFG_REQUIRED, "%s.ip", pfx)) {
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(gateway)) {
VLOG_INFO("bridge %s: configured gateway "IP_FMT,
br->name, IP_ARGS(&gateway.s_addr));
}
}
}
netdev_close(netdev);
}
}
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);
ofproto_set_probe_interval(br->ofproto,
probe ? probe : cfg_get_int(0, "mgmt.inactivity-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 = 15;
}
}
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);
}
}
svec_sort(ifaces);
assert(svec_is_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("dp%u reported interface %s twice",
dpif_id(&br->dpif), p->devname);
} else if (iface_from_dp_ifidx(br, p->port)) {
VLOG_WARN("dp%u reported interface %"PRIu16" twice",
dpif_id(&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 struct bond_entry *
lookup_bond_entry(const struct port *port, const uint8_t mac[ETH_ADDR_LEN])
{
size_t h = hash_bytes(mac, ETH_ADDR_LEN, 0);
return &port->bond_hash[h & BOND_MASK];
}
static int
bond_choose_iface(const struct port *port)
{
size_t i;
for (i = 0; i < port->n_ifaces; i++) {
if (port->ifaces[i]->enabled) {
return i;
}
}
return -1;
}
static bool
choose_output_iface(const struct port *port, const flow_t *flow,
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, flow->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();
}
*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 {
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_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) {
continue;
}
for (j = 0; j < port->n_ifaces; j++) {
struct iface *iface = port->ifaces[j];
if (time_msec() >= iface->delay_expires) {
iface->delay_expires = LLONG_MAX;
iface->enabled = !iface->enabled;
VLOG_WARN("interface %s: %s",
iface->name,
iface->enabled ? "enabled" : "disabled");
if (!iface->enabled) {
ofproto_revalidate(br->ofproto, iface->tag);
if (iface->port_ifidx == port->active_iface) {
ofproto_revalidate(br->ofproto,
port->active_iface_tag);
bond_choose_active_iface(port);
}
} else {
if (port->active_iface < 0) {
ofproto_revalidate(br->ofproto, port->no_ifaces_tag);
bond_choose_active_iface(port);
}
iface->tag = tag_create_random();
}
}
}
}
}
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, &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)
{
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++;
}
}
} else if (out_port && set_dst(dst, flow, in_port, out_port, tags)) {
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)
&& !dst_is_duplicate(dsts, dst - dsts, dst))
{
if (port->vlan < 0) {
dst->vlan = m->out_vlan;
}
if (dst->dp_ifidx == flow->in_port
&& dst->vlan == 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)
{
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);
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;
}
}
static bool
is_bcast_arp_reply(const flow_t *flow, const struct ofpbuf *packet)
{
struct arp_eth_header *arp = (struct arp_eth_header *) packet->data;
return (flow->dl_type == htons(ETH_TYPE_ARP)
&& eth_addr_is_broadcast(flow->dl_dst)
&& packet->size >= sizeof(struct arp_eth_header)
&& arp->ar_op == ARP_OP_REQUEST);
}
/* 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)
{
struct iface *in_iface;
struct port *in_port;
struct port *out_port = NULL; /* By default, drop the packet/flow. */
int vlan;
/* 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;
/* Figure out what VLAN this packet belongs to.
*
* 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.) */
vlan = ntohs(flow->dl_vlan);
if (vlan == OFP_VLAN_NONE) {
vlan = 0;
}
if (in_port->vlan >= 0) {
if (vlan) {
/* XXX support double tagging? */
if (packet != NULL) {
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);
}
goto done;
}
vlan = in_port->vlan;
} else {
if (!port_includes_vlan(in_port, vlan)) {
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);
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;
}
/* Drop multicast and broadcast packets on inactive bonded interfaces, to
* avoid receiving duplicates. */
if (in_port->n_ifaces > 1 && eth_addr_is_multicast(flow->dl_dst)) {
*tags |= in_port->active_iface_tag;
if (in_port->active_iface != in_iface->port_ifidx) {
goto done;
}
}
/* MAC learning. */
out_port = FLOOD_PORT;
if (br->ml) {
int out_port_idx;
bool may_learn;
if (!packet) {
/* Don't try to learn from revalidation. */
may_learn = false;
} else if (in_port->n_ifaces > 1) {
/* If the packet arrived on a bonded port, don't learn from it
* unless we haven't learned any port at all for that address
* (because we probably sent the packet on one bonded interface and
* got it back on the other). Broadcast ARP replies are an
* exception to this rule: the host has moved to another switch. */
int src_idx = mac_learning_lookup(br->ml, flow->dl_src, vlan);
may_learn = (src_idx < 0
|| src_idx == in_port->port_idx
|| is_bcast_arp_reply(flow, packet));
} else {
may_learn = true;
}
/* Learn source MAC. */
if (may_learn) {
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);
}
}
/* 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];
}
}
/* 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);
/*
* We send out only a single packet, instead of setting up a flow, if the
* packet is an ARP directed to broadcast that arrived on a bonded
* interface. In such a situation ARP requests and replies must be handled
* differently, but OpenFlow unfortunately can't distinguish them.
*/
return (in_port->n_ifaces < 2
|| flow->dl_type != htons(ETH_TYPE_ARP)
|| !eth_addr_is_broadcast(flow->dl_dst));
}
/* 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 {
memcpy(iface->mac, opp->hw_addr, ETH_ADDR_LEN);
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, 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);
}
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_;
const union odp_action *a;
if (!br->has_bonded_ports) {
return;
}
for (a = actions; a < &actions[n_actions]; a++) {
if (a->type == ODPAT_OUTPUT) {
struct port *port = port_from_dp_ifidx(br, a->output.port);
if (port && port->n_ifaces >= 2) {
struct bond_entry *e = lookup_bond_entry(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,
};
/* 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,
struct bond_entry *hash)
{
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 (from->hashes[0] == hash) {
from->hashes++;
} else {
int i = hash - from->hashes[0];
memmove(from->hashes + i, from->hashes + i + 1,
(from->n_hashes - (i + 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 not cause 'to''s load to exceed 'from''s load.
*
* 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;
for (i = 0; i < from->n_hashes; i++) {
uint64_t delta = from->hashes[i]->tx_bytes;
if (to->tx_bytes + delta < from->tx_bytes - delta) {
break;
}
}
if (i < from->n_hashes) {
bond_shift_load(from, to, from->hashes[i]);
/* 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;
}
}
/* 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);
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 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;
proc_net_compat_update_bond(port->name, NULL);
}
} 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_update_bond_compat(port);
}
}
static void
port_update_bond_compat(struct port *port)
{
struct compat_bond bond;
size_t i;
if (port->n_ifaces < 2) {
return;
}
bond.up = false;
bond.updelay = port->updelay;
bond.downdelay = port->downdelay;
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;
slave->up = ((iface->enabled && iface->delay_expires == LLONG_MAX) ||
(!iface->enabled && iface->delay_expires != LLONG_MAX));
if (slave->up) {
bond.up = true;
}
memcpy(slave->mac, iface->mac, ETH_ADDR_LEN);
}
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))
{
const uint8_t *ea = p->ifaces[0]->mac;
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)
{
enum netdev_flags flags;
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->enabled = true;
iface->delay_expires = LLONG_MAX;
netdev_nodev_get_etheraddr(name, iface->mac);
if (!netdev_nodev_get_flags(name, &flags)) {
iface->enabled = (flags & NETDEV_UP) != 0;
}
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);
port_update_bonding(port);
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;
free(iface->name);
free(iface);
if (del_active) {
ofproto_revalidate(port->bridge->ofproto, port->active_iface_tag);
bond_choose_active_iface(port);
}
port_update_bonding(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);
}
/* Port mirroring. */
static void
mirror_reconfigure(struct bridge *br)
{
struct svec old_mirrors, new_mirrors;
size_t i;
/* 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;
}
}
}
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;
/* 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);
svec_append(&src_ports, &ports);
svec_append(&dst_ports, &ports);
svec_destroy(&ports);
prune_ports(m, &src_ports);
prune_ports(m, &dst_ports);
/* 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. */
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 if (eth_addr_is_zero(iface->mac)) {
VLOG_WARN_RL(&rl, "%s: cannot send BPDU on port %d with unknown MAC",
br->name, port_no);
} else {
union ofp_action action;
struct eth_header *eth = pkt->l2;
flow_t flow;
memcpy(eth->eth_src, iface->mac, ETH_ADDR_LEN);
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);
}
}