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ovs-brcompatd.c
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/* Copyright (c) 2008, 2009, 2010, 2011 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 <config.h>
#include <asm/param.h>
#include <assert.h>
#include <errno.h>
#include <getopt.h>
#include <inttypes.h>
#include <limits.h>
#include <net/if.h>
#include <linux/genetlink.h>
#include <linux/rtnetlink.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#include <fcntl.h>
#include <unistd.h>
#include "command-line.h"
#include "coverage.h"
#include "daemon.h"
#include "dirs.h"
#include "dynamic-string.h"
#include "fatal-signal.h"
#include "json.h"
#include "leak-checker.h"
#include "netdev.h"
#include "netlink.h"
#include "netlink-socket.h"
#include "ofpbuf.h"
#include "openvswitch/brcompat-netlink.h"
#include "ovsdb-idl.h"
#include "packets.h"
#include "poll-loop.h"
#include "process.h"
#include "signals.h"
#include "svec.h"
#include "timeval.h"
#include "unixctl.h"
#include "util.h"
#include "vlog.h"
#include "vswitchd/vswitch-idl.h"
VLOG_DEFINE_THIS_MODULE(brcompatd);
/* xxx Just hangs if datapath is rmmod/insmod. Learn to reconnect? */
/* Actions to modify bridge compatibility configuration. */
enum bmc_action {
BMC_ADD_DP,
BMC_DEL_DP,
BMC_ADD_PORT,
BMC_DEL_PORT
};
static const char *parse_options(int argc, char *argv[]);
static void usage(void) NO_RETURN;
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 60);
/* Maximum number of milliseconds to wait before pruning port entries that
* no longer exist. If set to zero, ports are never pruned. */
static int prune_timeout = 5000;
/* Shell command to execute (via popen()) to send a control command to the
* running ovs-vswitchd process. The string must contain one instance of %s,
* which is replaced by the control command. */
static char *appctl_command;
/* Netlink socket to listen for interface changes. */
static struct nl_sock *rtnl_sock;
/* Netlink socket to bridge compatibility kernel module. */
static struct nl_sock *brc_sock;
/* The Generic Netlink family number used for bridge compatibility. */
static int brc_family;
static const struct nl_policy brc_multicast_policy[] = {
[BRC_GENL_A_MC_GROUP] = {.type = NL_A_U32 }
};
static const struct nl_policy rtnlgrp_link_policy[] = {
[IFLA_IFNAME] = { .type = NL_A_STRING, .optional = false },
[IFLA_MASTER] = { .type = NL_A_U32, .optional = true },
};
static int
lookup_brc_multicast_group(int *multicast_group)
{
struct nl_sock *sock;
struct ofpbuf request, *reply;
struct nlattr *attrs[ARRAY_SIZE(brc_multicast_policy)];
int retval;
retval = nl_sock_create(NETLINK_GENERIC, &sock);
if (retval) {
return retval;
}
ofpbuf_init(&request, 0);
nl_msg_put_genlmsghdr(&request, 0, brc_family,
NLM_F_REQUEST, BRC_GENL_C_QUERY_MC, 1);
retval = nl_sock_transact(sock, &request, &reply);
ofpbuf_uninit(&request);
if (retval) {
nl_sock_destroy(sock);
return retval;
}
if (!nl_policy_parse(reply, NLMSG_HDRLEN + GENL_HDRLEN,
brc_multicast_policy, attrs,
ARRAY_SIZE(brc_multicast_policy))) {
nl_sock_destroy(sock);
ofpbuf_delete(reply);
return EPROTO;
}
*multicast_group = nl_attr_get_u32(attrs[BRC_GENL_A_MC_GROUP]);
nl_sock_destroy(sock);
ofpbuf_delete(reply);
return 0;
}
/* Opens a socket for brcompat notifications. Returns 0 if successful,
* otherwise a positive errno value. */
static int
brc_open(struct nl_sock **sock)
{
int multicast_group = 0;
int retval;
retval = nl_lookup_genl_family(BRC_GENL_FAMILY_NAME, &brc_family);
if (retval) {
return retval;
}
retval = lookup_brc_multicast_group(&multicast_group);
if (retval) {
return retval;
}
retval = nl_sock_create(NETLINK_GENERIC, sock);
if (retval) {
return retval;
}
retval = nl_sock_join_mcgroup(*sock, multicast_group);
if (retval) {
nl_sock_destroy(*sock);
*sock = NULL;
}
return retval;
}
static const struct nl_policy brc_dp_policy[] = {
[BRC_GENL_A_DP_NAME] = { .type = NL_A_STRING },
};
static struct ovsrec_bridge *
find_bridge(const struct ovsrec_open_vswitch *ovs, const char *br_name)
{
size_t i;
for (i = 0; i < ovs->n_bridges; i++) {
if (!strcmp(br_name, ovs->bridges[i]->name)) {
return ovs->bridges[i];
}
}
return NULL;
}
static int
execute_appctl_command(const char *unixctl_command, char **output)
{
char *stdout_log, *stderr_log;
int error, status;
char *argv[5];
argv[0] = "/bin/sh";
argv[1] = "-c";
argv[2] = xasprintf(appctl_command, unixctl_command);
argv[3] = NULL;
/* Run process and log status. */
error = process_run_capture(argv, &stdout_log, &stderr_log, &status);
if (error) {
VLOG_ERR("failed to execute %s command via ovs-appctl: %s",
unixctl_command, strerror(error));
} else if (status) {
char *msg = process_status_msg(status);
VLOG_ERR("ovs-appctl exited with error (%s)", msg);
free(msg);
error = ECHILD;
}
/* Deal with stdout_log. */
if (output) {
*output = stdout_log;
} else {
free(stdout_log);
}
/* Deal with stderr_log */
if (stderr_log && *stderr_log) {
VLOG_INFO("ovs-appctl wrote to stderr:\n%s", stderr_log);
}
free(stderr_log);
free(argv[2]);
return error;
}
static void
do_get_bridge_parts(const struct ovsrec_bridge *br, struct svec *parts,
int vlan, bool break_down_bonds)
{
struct svec ports;
size_t i, j;
svec_init(&ports);
for (i = 0; i < br->n_ports; i++) {
const struct ovsrec_port *port = br->ports[i];
svec_add(&ports, port->name);
if (vlan >= 0) {
int port_vlan = port->n_tag ? *port->tag : 0;
if (vlan != port_vlan) {
continue;
}
}
if (break_down_bonds) {
for (j = 0; j < port->n_interfaces; j++) {
const struct ovsrec_interface *iface = port->interfaces[j];
svec_add(parts, iface->name);
}
} else {
svec_add(parts, port->name);
}
}
svec_destroy(&ports);
}
/* Add all the interfaces for 'bridge' to 'ifaces', breaking bonded interfaces
* down into their constituent parts.
*
* If 'vlan' < 0, all interfaces on 'bridge' are reported. If 'vlan' == 0,
* then only interfaces for trunk ports or ports with implicit VLAN 0 are
* reported. If 'vlan' > 0, only interfaces with implicit VLAN 'vlan' are
* reported. */
static void
get_bridge_ifaces(const struct ovsrec_bridge *br, struct svec *ifaces,
int vlan)
{
do_get_bridge_parts(br, ifaces, vlan, true);
}
/* Add all the ports for 'bridge' to 'ports'. Bonded ports are reported under
* the bond name, not broken down into their constituent interfaces.
*
* If 'vlan' < 0, all ports on 'bridge' are reported. If 'vlan' == 0, then
* only trunk ports or ports with implicit VLAN 0 are reported. If 'vlan' > 0,
* only port with implicit VLAN 'vlan' are reported. */
static void
get_bridge_ports(const struct ovsrec_bridge *br, struct svec *ports,
int vlan)
{
do_get_bridge_parts(br, ports, vlan, false);
}
static struct ovsdb_idl_txn *
txn_from_openvswitch(const struct ovsrec_open_vswitch *ovs)
{
return ovsdb_idl_txn_get(&ovs->header_);
}
static bool
port_is_fake_bridge(const struct ovsrec_port *port)
{
return (port->fake_bridge
&& port->tag
&& *port->tag >= 1 && *port->tag <= 4095);
}
static void
ovs_insert_bridge(const struct ovsrec_open_vswitch *ovs,
struct ovsrec_bridge *bridge)
{
struct ovsrec_bridge **bridges;
size_t i;
bridges = xmalloc(sizeof *ovs->bridges * (ovs->n_bridges + 1));
for (i = 0; i < ovs->n_bridges; i++) {
bridges[i] = ovs->bridges[i];
}
bridges[ovs->n_bridges] = bridge;
ovsrec_open_vswitch_set_bridges(ovs, bridges, ovs->n_bridges + 1);
free(bridges);
}
static struct json *
where_uuid_equals(const struct uuid *uuid)
{
return
json_array_create_1(
json_array_create_3(
json_string_create("_uuid"),
json_string_create("=="),
json_array_create_2(
json_string_create("uuid"),
json_string_create_nocopy(
xasprintf(UUID_FMT, UUID_ARGS(uuid))))));
}
/* Commits 'txn'. If 'wait_for_reload' is true, also waits for Open vSwitch to
reload the configuration before returning.
Returns EAGAIN if the caller should try the operation again, 0 on success,
otherwise a positive errno value. */
static int
commit_txn(struct ovsdb_idl_txn *txn, bool wait_for_reload)
{
struct ovsdb_idl *idl = ovsdb_idl_txn_get_idl (txn);
enum ovsdb_idl_txn_status status;
int64_t next_cfg = 0;
if (wait_for_reload) {
const struct ovsrec_open_vswitch *ovs = ovsrec_open_vswitch_first(idl);
struct json *where = where_uuid_equals(&ovs->header_.uuid);
ovsdb_idl_txn_increment(txn, "Open_vSwitch", "next_cfg", where);
json_destroy(where);
}
status = ovsdb_idl_txn_commit_block(txn);
if (wait_for_reload && status == TXN_SUCCESS) {
next_cfg = ovsdb_idl_txn_get_increment_new_value(txn);
}
ovsdb_idl_txn_destroy(txn);
switch (status) {
case TXN_INCOMPLETE:
NOT_REACHED();
case TXN_ABORTED:
VLOG_ERR_RL(&rl, "OVSDB transaction unexpectedly aborted");
return ECONNABORTED;
case TXN_UNCHANGED:
return 0;
case TXN_SUCCESS:
if (wait_for_reload) {
for (;;) {
/* We can't use 'ovs' any longer because ovsdb_idl_run() can
* destroy it. */
const struct ovsrec_open_vswitch *ovs2;
ovsdb_idl_run(idl);
OVSREC_OPEN_VSWITCH_FOR_EACH (ovs2, idl) {
if (ovs2->cur_cfg >= next_cfg) {
goto done;
}
}
ovsdb_idl_wait(idl);
poll_block();
}
done: ;
}
return 0;
case TXN_TRY_AGAIN:
VLOG_ERR_RL(&rl, "OVSDB transaction needs retry");
return EAGAIN;
case TXN_ERROR:
VLOG_ERR_RL(&rl, "OVSDB transaction failed: %s",
ovsdb_idl_txn_get_error(txn));
return EBUSY;
default:
NOT_REACHED();
}
}
static int
add_bridge(struct ovsdb_idl *idl, const struct ovsrec_open_vswitch *ovs,
const char *br_name)
{
struct ovsrec_bridge *br;
struct ovsrec_port *port;
struct ovsrec_interface *iface;
struct ovsdb_idl_txn *txn;
if (find_bridge(ovs, br_name)) {
VLOG_WARN("addbr %s: bridge %s exists", br_name, br_name);
return EEXIST;
} else if (netdev_exists(br_name)) {
size_t i;
for (i = 0; i < ovs->n_bridges; i++) {
size_t j;
struct ovsrec_bridge *br_cfg = ovs->bridges[i];
for (j = 0; j < br_cfg->n_ports; j++) {
if (port_is_fake_bridge(br_cfg->ports[j])) {
VLOG_WARN("addbr %s: %s exists as a fake bridge",
br_name, br_name);
return 0;
}
}
}
VLOG_WARN("addbr %s: cannot create bridge %s because a network "
"device named %s already exists",
br_name, br_name, br_name);
return EEXIST;
}
txn = ovsdb_idl_txn_create(idl);
ovsdb_idl_txn_add_comment(txn, "ovs-brcompatd: addbr %s", br_name);
iface = ovsrec_interface_insert(txn_from_openvswitch(ovs));
ovsrec_interface_set_name(iface, br_name);
port = ovsrec_port_insert(txn_from_openvswitch(ovs));
ovsrec_port_set_name(port, br_name);
ovsrec_port_set_interfaces(port, &iface, 1);
br = ovsrec_bridge_insert(txn_from_openvswitch(ovs));
ovsrec_bridge_set_name(br, br_name);
ovsrec_bridge_set_ports(br, &port, 1);
ovs_insert_bridge(ovs, br);
return commit_txn(txn, true);
}
static void
add_port(const struct ovsrec_open_vswitch *ovs,
const struct ovsrec_bridge *br, const char *port_name)
{
struct ovsrec_interface *iface;
struct ovsrec_port *port;
struct ovsrec_port **ports;
size_t i;
/* xxx Check conflicts? */
iface = ovsrec_interface_insert(txn_from_openvswitch(ovs));
ovsrec_interface_set_name(iface, port_name);
port = ovsrec_port_insert(txn_from_openvswitch(ovs));
ovsrec_port_set_name(port, port_name);
ovsrec_port_set_interfaces(port, &iface, 1);
ports = xmalloc(sizeof *br->ports * (br->n_ports + 1));
for (i = 0; i < br->n_ports; i++) {
ports[i] = br->ports[i];
}
ports[br->n_ports] = port;
ovsrec_bridge_set_ports(br, ports, br->n_ports + 1);
free(ports);
}
/* Deletes 'port' from 'br'.
*
* After calling this function, 'port' must not be referenced again. */
static void
del_port(const struct ovsrec_bridge *br, const struct ovsrec_port *port)
{
struct ovsrec_port **ports;
size_t i, n;
/* Remove 'port' from the bridge's list of ports. */
ports = xmalloc(sizeof *br->ports * br->n_ports);
for (i = n = 0; i < br->n_ports; i++) {
if (br->ports[i] != port) {
ports[n++] = br->ports[i];
}
}
ovsrec_bridge_set_ports(br, ports, n);
free(ports);
}
/* Delete 'iface' from 'port' (which must be within 'br'). If 'iface' was
* 'port''s only interface, delete 'port' from 'br' also.
*
* After calling this function, 'iface' must not be referenced again. */
static void
del_interface(const struct ovsrec_bridge *br,
const struct ovsrec_port *port,
const struct ovsrec_interface *iface)
{
if (port->n_interfaces == 1) {
del_port(br, port);
} else {
struct ovsrec_interface **ifaces;
size_t i, n;
ifaces = xmalloc(sizeof *port->interfaces * port->n_interfaces);
for (i = n = 0; i < port->n_interfaces; i++) {
if (port->interfaces[i] != iface) {
ifaces[n++] = port->interfaces[i];
}
}
ovsrec_port_set_interfaces(port, ifaces, n);
free(ifaces);
}
}
/* Find and return a port within 'br' named 'port_name'. */
static const struct ovsrec_port *
find_port(const struct ovsrec_bridge *br, const char *port_name)
{
size_t i;
for (i = 0; i < br->n_ports; i++) {
struct ovsrec_port *port = br->ports[i];
if (!strcmp(port_name, port->name)) {
return port;
}
}
return NULL;
}
/* Find and return an interface within 'br' named 'iface_name'. */
static const struct ovsrec_interface *
find_interface(const struct ovsrec_bridge *br, const char *iface_name,
struct ovsrec_port **portp)
{
size_t i;
for (i = 0; i < br->n_ports; i++) {
struct ovsrec_port *port = br->ports[i];
size_t j;
for (j = 0; j < port->n_interfaces; j++) {
struct ovsrec_interface *iface = port->interfaces[j];
if (!strcmp(iface->name, iface_name)) {
*portp = port;
return iface;
}
}
}
*portp = NULL;
return NULL;
}
static int
del_bridge(struct ovsdb_idl *idl,
const struct ovsrec_open_vswitch *ovs, const char *br_name)
{
struct ovsrec_bridge *br = find_bridge(ovs, br_name);
struct ovsrec_bridge **bridges;
struct ovsdb_idl_txn *txn;
size_t i, n;
if (!br) {
VLOG_WARN("delbr %s: no bridge named %s", br_name, br_name);
return ENXIO;
}
txn = ovsdb_idl_txn_create(idl);
ovsdb_idl_txn_add_comment(txn, "ovs-brcompatd: delbr %s", br_name);
/* Remove 'br' from the vswitch's list of bridges. */
bridges = xmalloc(sizeof *ovs->bridges * ovs->n_bridges);
for (i = n = 0; i < ovs->n_bridges; i++) {
if (ovs->bridges[i] != br) {
bridges[n++] = ovs->bridges[i];
}
}
ovsrec_open_vswitch_set_bridges(ovs, bridges, n);
free(bridges);
return commit_txn(txn, true);
}
static int
parse_command(struct ofpbuf *buffer, uint32_t *seq, const char **br_name,
const char **port_name, uint64_t *count, uint64_t *skip)
{
static const struct nl_policy policy[] = {
[BRC_GENL_A_DP_NAME] = { .type = NL_A_STRING, .optional = true },
[BRC_GENL_A_PORT_NAME] = { .type = NL_A_STRING, .optional = true },
[BRC_GENL_A_FDB_COUNT] = { .type = NL_A_U64, .optional = true },
[BRC_GENL_A_FDB_SKIP] = { .type = NL_A_U64, .optional = true },
};
struct nlattr *attrs[ARRAY_SIZE(policy)];
if (!nl_policy_parse(buffer, NLMSG_HDRLEN + GENL_HDRLEN, policy,
attrs, ARRAY_SIZE(policy))
|| (br_name && !attrs[BRC_GENL_A_DP_NAME])
|| (port_name && !attrs[BRC_GENL_A_PORT_NAME])
|| (count && !attrs[BRC_GENL_A_FDB_COUNT])
|| (skip && !attrs[BRC_GENL_A_FDB_SKIP])) {
return EINVAL;
}
*seq = ((struct nlmsghdr *) buffer->data)->nlmsg_seq;
if (br_name) {
*br_name = nl_attr_get_string(attrs[BRC_GENL_A_DP_NAME]);
}
if (port_name) {
*port_name = nl_attr_get_string(attrs[BRC_GENL_A_PORT_NAME]);
}
if (count) {
*count = nl_attr_get_u64(attrs[BRC_GENL_A_FDB_COUNT]);
}
if (skip) {
*skip = nl_attr_get_u64(attrs[BRC_GENL_A_FDB_SKIP]);
}
return 0;
}
/* Composes and returns a reply to a request made by the datapath with Netlink
* sequence number 'seq' and error code 'error'. The caller may add additional
* attributes to the message, then it may send it with send_reply(). */
static struct ofpbuf *
compose_reply(uint32_t seq, int error)
{
struct ofpbuf *reply = ofpbuf_new(4096);
nl_msg_put_genlmsghdr(reply, 32, brc_family, NLM_F_REQUEST,
BRC_GENL_C_DP_RESULT, 1);
((struct nlmsghdr *) reply->data)->nlmsg_seq = seq;
nl_msg_put_u32(reply, BRC_GENL_A_ERR_CODE, error);
return reply;
}
/* Sends 'reply' to the datapath and frees it. */
static void
send_reply(struct ofpbuf *reply)
{
int retval = nl_sock_send(brc_sock, reply, false);
if (retval) {
VLOG_WARN_RL(&rl, "replying to brcompat request: %s",
strerror(retval));
}
ofpbuf_delete(reply);
}
/* Composes and sends a reply to a request made by the datapath with Netlink
* sequence number 'seq' and error code 'error'. */
static void
send_simple_reply(uint32_t seq, int error)
{
send_reply(compose_reply(seq, error));
}
static int
handle_bridge_cmd(struct ovsdb_idl *idl,
const struct ovsrec_open_vswitch *ovs,
struct ofpbuf *buffer, bool add)
{
const char *br_name;
uint32_t seq;
int error;
error = parse_command(buffer, &seq, &br_name, NULL, NULL, NULL);
if (!error) {
int retval;
do {
retval = (add ? add_bridge : del_bridge)(idl, ovs, br_name);
VLOG_INFO_RL(&rl, "%sbr %s: %s",
add ? "add" : "del", br_name, strerror(retval));
} while (retval == EAGAIN);
send_simple_reply(seq, error);
}
return error;
}
static const struct nl_policy brc_port_policy[] = {
[BRC_GENL_A_DP_NAME] = { .type = NL_A_STRING },
[BRC_GENL_A_PORT_NAME] = { .type = NL_A_STRING },
};
static int
handle_port_cmd(struct ovsdb_idl *idl,
const struct ovsrec_open_vswitch *ovs,
struct ofpbuf *buffer, bool add)
{
const char *cmd_name = add ? "add-if" : "del-if";
const char *br_name, *port_name;
uint32_t seq;
int error;
error = parse_command(buffer, &seq, &br_name, &port_name, NULL, NULL);
if (!error) {
struct ovsrec_bridge *br = find_bridge(ovs, br_name);
if (!br) {
VLOG_WARN("%s %s %s: no bridge named %s",
cmd_name, br_name, port_name, br_name);
error = EINVAL;
} else if (!netdev_exists(port_name)) {
VLOG_WARN("%s %s %s: no network device named %s",
cmd_name, br_name, port_name, port_name);
error = EINVAL;
} else {
do {
struct ovsdb_idl_txn *txn = ovsdb_idl_txn_create(idl);
if (add) {
ovsdb_idl_txn_add_comment(txn, "ovs-brcompatd: add-if %s",
port_name);
add_port(ovs, br, port_name);
} else {
const struct ovsrec_port *port = find_port(br, port_name);
if (port) {
ovsdb_idl_txn_add_comment(txn,
"ovs-brcompatd: del-if %s",
port_name);
del_port(br, port);
}
}
error = commit_txn(txn, true);
VLOG_INFO_RL(&rl, "%s %s %s: %s",
cmd_name, br_name, port_name, strerror(error));
} while (error == EAGAIN);
}
send_simple_reply(seq, error);
}
return error;
}
/* The caller is responsible for freeing '*ovs_name' if the call is
* successful. */
static int
linux_bridge_to_ovs_bridge(const struct ovsrec_open_vswitch *ovs,
const char *linux_name,
const struct ovsrec_bridge **ovs_bridge,
int *br_vlan)
{
*ovs_bridge = find_bridge(ovs, linux_name);
if (*ovs_bridge) {
/* Bridge name is the same. We are interested in VLAN 0. */
*br_vlan = 0;
return 0;
} else {
/* No such Open vSwitch bridge 'linux_name', but there might be an
* internal port named 'linux_name' on some other bridge
* 'ovs_bridge'. If so then we are interested in the VLAN assigned to
* port 'linux_name' on the bridge named 'ovs_bridge'. */
size_t i, j;
for (i = 0; i < ovs->n_bridges; i++) {
const struct ovsrec_bridge *br = ovs->bridges[i];
for (j = 0; j < br->n_ports; j++) {
const struct ovsrec_port *port = br->ports[j];
if (!strcmp(port->name, linux_name)) {
*ovs_bridge = br;
*br_vlan = port->n_tag ? *port->tag : -1;
return 0;
}
}
}
return ENODEV;
}
}
static int
handle_fdb_query_cmd(const struct ovsrec_open_vswitch *ovs,
struct ofpbuf *buffer)
{
/* This structure is copied directly from the Linux 2.6.30 header files.
* It would be more straightforward to #include <linux/if_bridge.h>, but
* the 'port_hi' member was only introduced in Linux 2.6.26 and so systems
* with old header files won't have it. */
struct __fdb_entry {
__u8 mac_addr[6];
__u8 port_no;
__u8 is_local;
__u32 ageing_timer_value;
__u8 port_hi;
__u8 pad0;
__u16 unused;
};
struct mac {
uint8_t addr[6];
};
struct mac *local_macs;
int n_local_macs;
int i;
/* Impedance matching between the vswitchd and Linux kernel notions of what
* a bridge is. The kernel only handles a single VLAN per bridge, but
* vswitchd can deal with all the VLANs on a single bridge. We have to
* pretend that the former is the case even though the latter is the
* implementation. */
const char *linux_name; /* Name used by brctl. */
const struct ovsrec_bridge *ovs_bridge; /* Bridge used by ovs-vswitchd. */
int br_vlan; /* VLAN tag. */
struct svec ifaces;
struct ofpbuf query_data;
struct ofpbuf *reply;
char *unixctl_command;
uint64_t count, skip;
char *output;
char *save_ptr;
uint32_t seq;
int error;
/* Parse the command received from brcompat_mod. */
error = parse_command(buffer, &seq, &linux_name, NULL, &count, &skip);
if (error) {
return error;
}
/* Figure out vswitchd bridge and VLAN. */
error = linux_bridge_to_ovs_bridge(ovs, linux_name,
&ovs_bridge, &br_vlan);
if (error) {
send_simple_reply(seq, error);
return error;
}
/* Fetch the forwarding database using ovs-appctl. */
unixctl_command = xasprintf("fdb/show %s", ovs_bridge->name);
error = execute_appctl_command(unixctl_command, &output);
free(unixctl_command);
if (error) {
send_simple_reply(seq, error);
return error;
}
/* Fetch the MAC address for each interface on the bridge, so that we can
* fill in the is_local field in the response. */
svec_init(&ifaces);
get_bridge_ifaces(ovs_bridge, &ifaces, br_vlan);
local_macs = xmalloc(ifaces.n * sizeof *local_macs);
n_local_macs = 0;
for (i = 0; i < ifaces.n; i++) {
const char *iface_name = ifaces.names[i];
struct mac *mac = &local_macs[n_local_macs];
struct netdev *netdev;
error = netdev_open_default(iface_name, &netdev);
if (!error) {
if (!netdev_get_etheraddr(netdev, mac->addr)) {
n_local_macs++;
}
netdev_close(netdev);
}
}
svec_destroy(&ifaces);
/* Parse the response from ovs-appctl and convert it to binary format to
* pass back to the kernel. */
ofpbuf_init(&query_data, sizeof(struct __fdb_entry) * 8);
save_ptr = NULL;
strtok_r(output, "\n", &save_ptr); /* Skip header line. */
while (count > 0) {
struct __fdb_entry *entry;
int port, vlan, age;
uint8_t mac[ETH_ADDR_LEN];
char *line;
bool is_local;
line = strtok_r(NULL, "\n", &save_ptr);
if (!line) {
break;
}
if (sscanf(line, "%d %d "ETH_ADDR_SCAN_FMT" %d",
&port, &vlan, ETH_ADDR_SCAN_ARGS(mac), &age)
!= 2 + ETH_ADDR_SCAN_COUNT + 1) {
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
VLOG_INFO_RL(&rl, "fdb/show output has invalid format: %s", line);
continue;
}
if (vlan != br_vlan) {
continue;
}
if (skip > 0) {
skip--;
continue;
}
/* Is this the MAC address of an interface on the bridge? */
is_local = false;
for (i = 0; i < n_local_macs; i++) {
if (eth_addr_equals(local_macs[i].addr, mac)) {
is_local = true;
break;
}
}
entry = ofpbuf_put_uninit(&query_data, sizeof *entry);
memcpy(entry->mac_addr, mac, ETH_ADDR_LEN);
entry->port_no = port & 0xff;
entry->is_local = is_local;
entry->ageing_timer_value = age * HZ;
entry->port_hi = (port & 0xff00) >> 8;
entry->pad0 = 0;
entry->unused = 0;
count--;
}
free(output);
/* Compose and send reply to datapath. */
reply = compose_reply(seq, 0);
nl_msg_put_unspec(reply, BRC_GENL_A_FDB_DATA,
query_data.data, query_data.size);
send_reply(reply);
/* Free memory. */
ofpbuf_uninit(&query_data);
free(local_macs);
return 0;
}
static void
send_ifindex_reply(uint32_t seq, struct svec *ifaces)
{
struct ofpbuf *reply;
const char *iface;
size_t n_indices;
int *indices;
size_t i;
/* Make sure that any given interface only occurs once. This shouldn't
* happen, but who knows what people put into their configuration files. */
svec_sort_unique(ifaces);
/* Convert 'ifaces' into ifindexes. */
n_indices = 0;
indices = xmalloc(ifaces->n * sizeof *indices);
SVEC_FOR_EACH (i, iface, ifaces) {
int ifindex = if_nametoindex(iface);
if (ifindex) {
indices[n_indices++] = ifindex;
}
}
/* Compose and send reply. */
reply = compose_reply(seq, 0);
nl_msg_put_unspec(reply, BRC_GENL_A_IFINDEXES,
indices, n_indices * sizeof *indices);
send_reply(reply);
/* Free memory. */
free(indices);
}
static int
handle_get_bridges_cmd(const struct ovsrec_open_vswitch *ovs,
struct ofpbuf *buffer)
{
struct svec bridges;
size_t i, j;
uint32_t seq;
int error;
/* Parse Netlink command.
*
* The command doesn't actually have any arguments, but we need the
* sequence number to send the reply. */
error = parse_command(buffer, &seq, NULL, NULL, NULL, NULL);
if (error) {
return error;
}
/* Get all the real bridges and all the fake ones. */
svec_init(&bridges);
for (i = 0; i < ovs->n_bridges; i++) {
const struct ovsrec_bridge *br = ovs->bridges[i];