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ovs/lib/rstp-state-machines.c
Ben Pfaff b2befd5bb2 sparse: Add guards to prevent FreeBSD-incompatible #include order. 
FreeBSD insists that <sys/types.h> be included before <netinet/in.h> and
that <netinet/in.h> be included before <arpa/inet.h>.  This adds guards to
the "sparse" headers to yield a warning if this order is violated.  This
commit also adjusts the order of many #includes to suit this requirement.

Signed-off-by: Ben Pfaff <blp@ovn.org>
Acked-by: Justin Pettit <jpettit@ovn.org>
2017-12-22 12:58:02 -08:00

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/*
* Copyright (c) 2011-2015 M3S, Srl - Italy
*
* 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.
*/
/*
* Rapid Spanning Tree Protocol (IEEE 802.1D-2004) state machines
* implementation.
*
* Authors:
* Martino Fornasa <mf@fornasa.it>
* Daniele Venturino <daniele.venturino@m3s.it>
* Carlo Andreotti <c.andreotti@m3s.it>
*
* References to IEEE 802.1D-2004 standard are enclosed in square brackets.
* E.g. [17.3], [Table 17-1], etc.
*
*/
#include <config.h>
#include "rstp.h"
#include "rstp-state-machines.h"
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <inttypes.h>
#include <stdlib.h>
#include "byte-order.h"
#include "connectivity.h"
#include "openvswitch/ofpbuf.h"
#include "dp-packet.h"
#include "packets.h"
#include "seq.h"
#include "unixctl.h"
#include "util.h"
#include "openvswitch/vlog.h"
VLOG_DEFINE_THIS_MODULE(rstp_sm);
#define ROLE_FLAG_MASK 0xC
#define ROLE_FLAG_SHIFT 2
enum port_flag {
PORT_UNKN = 0,
PORT_ALT_BACK = 1,
PORT_ROOT = 2,
PORT_DES = 3
};
enum bpdu_size {
CONFIGURATION_BPDU_SIZE = 35,
TOPOLOGY_CHANGE_NOTIFICATION_BPDU_SIZE = 4,
RAPID_SPANNING_TREE_BPDU_SIZE = 36
};
/* Same is a subset of SUPERIOR, so can be used as a boolean when the
* distinction is not significant. */
enum vector_comparison {
INFERIOR = 0,
SUPERIOR = 1,
SAME = 2
};
static void decrement_timer(uint16_t *);
static void rstp_send_bpdu(struct rstp_port *, const void *, size_t)
OVS_REQUIRES(rstp_mutex);
static int validate_received_bpdu(struct rstp_port *, const void *, size_t)
OVS_REQUIRES(rstp_mutex);
static ovs_be16 time_encode(uint8_t);
static uint8_t time_decode(ovs_be16);
static enum vector_comparison
compare_rstp_priority_vectors(const struct rstp_priority_vector *,
const struct rstp_priority_vector *);
static bool rstp_times_equal(struct rstp_times *, struct rstp_times *);
/* Per-Bridge State Machine */
static int port_role_selection_sm(struct rstp *)
OVS_REQUIRES(rstp_mutex);
/* Per-Port State Machines */
static int port_receive_sm(struct rstp_port *)
OVS_REQUIRES(rstp_mutex);
static int port_protocol_migration_sm(struct rstp_port *)
OVS_REQUIRES(rstp_mutex);
static int bridge_detection_sm(struct rstp_port *)
OVS_REQUIRES(rstp_mutex);
static int port_transmit_sm(struct rstp_port *)
OVS_REQUIRES(rstp_mutex);
static int port_information_sm(struct rstp_port *)
OVS_REQUIRES(rstp_mutex);
static int port_role_transition_sm(struct rstp_port *)
OVS_REQUIRES(rstp_mutex);
static int port_state_transition_sm(struct rstp_port *)
OVS_REQUIRES(rstp_mutex);
static int topology_change_sm(struct rstp_port *)
OVS_REQUIRES(rstp_mutex);
/* port_timers_sm() not defined as a state machine */
void
process_received_bpdu__(struct rstp_port *p, const void *bpdu_,
size_t bpdu_size)
OVS_REQUIRES(rstp_mutex)
{
struct rstp *rstp = p->rstp;
struct rstp_bpdu *bpdu = (struct rstp_bpdu *)bpdu_;
if (!p->port_enabled) {
return;
}
if (p->rcvd_bpdu) {
return;
}
/* [9.2.9 Encoding of Port Role values]
* NOTE. If the Unknown value of the Port Role parameter is received, the
* state machines will effectively treat the RST BPDU as if it were a
* Configuration BPDU.
*/
if (bpdu->bpdu_type == RAPID_SPANNING_TREE_BPDU) {
uint8_t role = (bpdu->flags & ROLE_FLAG_MASK) >> ROLE_FLAG_SHIFT;
if (role == PORT_UNKN) {
bpdu->bpdu_type = CONFIGURATION_BPDU;
}
}
if (validate_received_bpdu(p, bpdu, bpdu_size) == 0) {
p->rcvd_bpdu = true;
p->rx_rstp_bpdu_cnt++;
memcpy(&p->received_bpdu_buffer, bpdu, sizeof(struct rstp_bpdu));
rstp->changes = true;
move_rstp__(rstp);
} else {
VLOG_DBG("%s, port %u: Bad STP or RSTP BPDU received", p->rstp->name,
p->port_number);
p->error_count++;
}
}
/* Returns 0 on success. */
static int
validate_received_bpdu(struct rstp_port *p, const void *bpdu, size_t bpdu_size)
OVS_REQUIRES(rstp_mutex)
{
/* Validation of received BPDU, see [9.3.4]. */
const struct rstp_bpdu *temp;
temp = bpdu;
if (bpdu_size < TOPOLOGY_CHANGE_NOTIFICATION_BPDU_SIZE ||
ntohs(temp->protocol_identifier) != 0) {
return -1;
} else {
if (temp->bpdu_type == CONFIGURATION_BPDU
&& bpdu_size >= CONFIGURATION_BPDU_SIZE
&& (time_decode(temp->message_age) < time_decode(temp->max_age))) {
if ((ntohll(temp->designated_bridge_id) !=
p->rstp->bridge_identifier)
|| ((ntohll(temp->designated_bridge_id) ==
p->rstp->bridge_identifier)
&& (ntohs(temp->designated_port_id) != p->port_id))) {
return 0;
} else {
return -1;
}
} else if (temp->bpdu_type == TOPOLOGY_CHANGE_NOTIFICATION_BPDU) {
return 0;
} else if (temp->bpdu_type == RAPID_SPANNING_TREE_BPDU &&
bpdu_size >= RAPID_SPANNING_TREE_BPDU_SIZE) {
return 0;
} else {
return -1;
}
}
}
/*
* move_rstp__()
* This method is invoked to move the State Machines. The SMs move only if the
* boolean 'changes' is true, meaning that something changed and the SMs need
* to work to process this change.
* The boolean 'changes' is set every time a SM modifies its state, a BPDU is
* received, a timer expires or port down event is detected. If a parameter is
* set by management, then 'changes' is set.
*/
#define MAX_RSTP_ITERATIONS 1000 /* safeguard */
int
move_rstp__(struct rstp *rstp)
OVS_REQUIRES(rstp_mutex)
{
int num_iterations;
num_iterations = 0;
while (rstp->changes == true && num_iterations < MAX_RSTP_ITERATIONS) {
struct rstp_port *p;
VLOG_DBG("%s: move_rstp()", rstp->name);
rstp->changes = false;
port_role_selection_sm(rstp);
HMAP_FOR_EACH (p, node, &rstp->ports) {
if (p->rstp_state != RSTP_DISABLED) {
port_receive_sm(p);
bridge_detection_sm(p);
port_information_sm(p);
port_role_transition_sm(p);
port_state_transition_sm(p);
topology_change_sm(p);
port_transmit_sm(p);
port_protocol_migration_sm(p);
}
}
num_iterations++;
seq_change(connectivity_seq_get());
}
if (num_iterations >= MAX_RSTP_ITERATIONS) {
VLOG_ERR("%s: move_rstp() reached the iteration safeguard limit!",
rstp->name);
}
return 0;
}
void decrease_rstp_port_timers__(struct rstp *r)
OVS_REQUIRES(rstp_mutex)
{
struct rstp_port *p;
HMAP_FOR_EACH (p, node, &r->ports) {
decrement_timer(&p->hello_when);
decrement_timer(&p->tc_while);
decrement_timer(&p->fd_while);
decrement_timer(&p->rcvd_info_while);
decrement_timer(&p->rr_while);
decrement_timer(&p->rb_while);
decrement_timer(&p->mdelay_while);
decrement_timer(&p->edge_delay_while);
decrement_timer(&p->tx_count);
p->uptime += 1;
}
r->changes = true;
move_rstp__(r);
}
static void
decrement_timer(uint16_t *timer)
{
if (*timer != 0) {
*timer -= 1;
}
}
/* Bridge State Machine. */
/* [17.28] Port Role Selection state machine. */
static void
updt_role_disabled_tree(struct rstp *r)
OVS_REQUIRES(rstp_mutex)
{
struct rstp_port *p;
HMAP_FOR_EACH (p, node, &r->ports) {
p->selected_role = ROLE_DISABLED;
}
}
static void
clear_reselect_tree(struct rstp *r)
OVS_REQUIRES(rstp_mutex)
{
struct rstp_port *p;
HMAP_FOR_EACH (p, node, &r->ports) {
p->reselect = false;
}
}
void
updt_roles_tree__(struct rstp *r)
OVS_REQUIRES(rstp_mutex)
{
struct rstp_port *p;
int vsel;
struct rstp_priority_vector best_vector, candidate_vector;
enum rstp_port_role new_root_old_role = ROLE_DESIGNATED;
uint16_t old_root_port_number = 0;
uint16_t new_root_port_number = 0;
old_root_port_number = r->root_port_id & 0x00ff;
if (old_root_port_number) {
r->old_root_aux = rstp_get_port_aux__(r, old_root_port_number);
}
vsel = -1;
best_vector = r->bridge_priority;
/* Letter c1) */
r->root_times = r->bridge_times;
/* Letters a) b) c) */
HMAP_FOR_EACH (p, node, &r->ports) {
uint32_t old_root_path_cost;
uint32_t root_path_cost;
if (p->info_is != INFO_IS_RECEIVED) {
continue;
}
/* [17.6] */
candidate_vector = p->port_priority;
candidate_vector.bridge_port_id = p->port_id;
old_root_path_cost = candidate_vector.root_path_cost;
root_path_cost = old_root_path_cost + p->port_path_cost;
candidate_vector.root_path_cost = root_path_cost;
if ((candidate_vector.designated_bridge_id & 0xffffffffffffULL) ==
(r->bridge_priority.designated_bridge_id & 0xffffffffffffULL)) {
continue;
}
if (compare_rstp_priority_vectors(&candidate_vector,
&best_vector) == SUPERIOR) {
best_vector = candidate_vector;
r->root_times = p->port_times;
r->root_times.message_age++;
vsel = p->port_number;
new_root_old_role = p->role;
}
}
r->root_priority = best_vector;
r->root_port_id = best_vector.bridge_port_id;
VLOG_DBG("%s: new Root is "RSTP_ID_FMT, r->name,
RSTP_ID_ARGS(r->root_priority.root_bridge_id));
new_root_port_number = r->root_port_id & 0x00ff;
if (new_root_port_number) {
r->new_root_aux = rstp_get_port_aux__(r, new_root_port_number);
}
/* Shift learned MAC addresses from an old Root Port to an existing
* Alternate Port. */
if (!r->root_changed
&& new_root_old_role == ROLE_ALTERNATE
&& new_root_port_number
&& old_root_port_number
&& new_root_port_number != old_root_port_number) {
r->root_changed = true;
}
/* Letters d) e) */
HMAP_FOR_EACH (p, node, &r->ports) {
p->designated_priority_vector.root_bridge_id =
r->root_priority.root_bridge_id;
p->designated_priority_vector.root_path_cost =
r->root_priority.root_path_cost;
p->designated_priority_vector.designated_bridge_id =
r->bridge_identifier;
p->designated_priority_vector.designated_port_id =
p->port_id;
p->designated_times = r->root_times;
p->designated_times.hello_time = r->bridge_times.hello_time;
}
HMAP_FOR_EACH (p, node, &r->ports) {
switch (p->info_is) {
case INFO_IS_DISABLED:
p->selected_role = ROLE_DISABLED;
break;
case INFO_IS_AGED:
p->updt_info = true;
p->selected_role = ROLE_DESIGNATED;
break;
case INFO_IS_MINE:
p->selected_role = ROLE_DESIGNATED;
if (compare_rstp_priority_vectors(
&p->port_priority, &p->designated_priority_vector) != SAME
|| !rstp_times_equal(&p->designated_times, &r->root_times)) {
p->updt_info = true;
}
break;
case INFO_IS_RECEIVED:
if (vsel == p->port_number) { /* Letter i) */
p->selected_role = ROLE_ROOT;
p->updt_info = false;
} else if (compare_rstp_priority_vectors(
&p->designated_priority_vector,
&p->port_priority) == INFERIOR) {
if (p->port_priority.designated_bridge_id !=
r->bridge_identifier) {
p->selected_role = ROLE_ALTERNATE;
p->updt_info = false;
} else {
p->selected_role = ROLE_BACKUP;
p->updt_info = false;
}
} else {
p->selected_role = ROLE_DESIGNATED;
p->updt_info = true;
}
break;
default:
OVS_NOT_REACHED();
/* fall through */
}
}
seq_change(connectivity_seq_get());
}
static void
set_selected_tree(struct rstp *r)
OVS_REQUIRES(rstp_mutex)
{
struct rstp_port *p;
HMAP_FOR_EACH (p, node, &r->ports) {
if (p->reselect) {
return;
}
}
HMAP_FOR_EACH (p, node, &r->ports) {
p->selected = true;
}
}
static int
port_role_selection_sm(struct rstp *r)
OVS_REQUIRES(rstp_mutex)
{
enum port_role_selection_state_machine old_state;
struct rstp_port *p;
old_state = r->port_role_selection_sm_state;
switch (r->port_role_selection_sm_state) {
case PORT_ROLE_SELECTION_SM_INIT:
if (r->begin) {
r->port_role_selection_sm_state =
PORT_ROLE_SELECTION_SM_INIT_BRIDGE_EXEC;
}
break;
case PORT_ROLE_SELECTION_SM_INIT_BRIDGE_EXEC:
updt_role_disabled_tree(r);
r->port_role_selection_sm_state = PORT_ROLE_SELECTION_SM_INIT_BRIDGE;
/* fall through */
case PORT_ROLE_SELECTION_SM_INIT_BRIDGE:
r->port_role_selection_sm_state =
PORT_ROLE_SELECTION_SM_ROLE_SELECTION_EXEC;
break;
case PORT_ROLE_SELECTION_SM_ROLE_SELECTION_EXEC:
clear_reselect_tree(r);
updt_roles_tree__(r);
set_selected_tree(r);
r->port_role_selection_sm_state =
PORT_ROLE_SELECTION_SM_ROLE_SELECTION;
/* fall through */
case PORT_ROLE_SELECTION_SM_ROLE_SELECTION:
HMAP_FOR_EACH (p, node, &r->ports) {
if (p->reselect) {
r->port_role_selection_sm_state =
PORT_ROLE_SELECTION_SM_ROLE_SELECTION_EXEC;
break;
}
}
break;
default:
OVS_NOT_REACHED();
/* fall through */
}
if (old_state != r->port_role_selection_sm_state) {
r->changes = true;
VLOG_DBG("%s: Port_role_selection_sm %d -> %d", r->name,
old_state, r->port_role_selection_sm_state);
}
return 0;
}
/* Port State Machines */
/* [17.23 - Port receive state machine] */
static void
updt_bpdu_version(struct rstp_port *p) /* [17.21.22] */
OVS_REQUIRES(rstp_mutex)
{
switch (p->received_bpdu_buffer.bpdu_type) {
case CONFIGURATION_BPDU:
case TOPOLOGY_CHANGE_NOTIFICATION_BPDU:
p->rcvd_rstp = false;
p->rcvd_stp = true;
break;
case RAPID_SPANNING_TREE_BPDU:
p->rcvd_rstp = true;
p->rcvd_stp = false;
break;
default:
OVS_NOT_REACHED();
/* fall through */
}
}
static int
port_receive_sm(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
enum port_receive_state_machine old_state;
struct rstp *r;
old_state = p->port_receive_sm_state;
r = p->rstp;
switch (p->port_receive_sm_state) {
case PORT_RECEIVE_SM_INIT:
if (r->begin || ((p->rcvd_bpdu || (p->edge_delay_while !=
r->migrate_time)) && !p->port_enabled)) {
p->port_receive_sm_state = PORT_RECEIVE_SM_DISCARD_EXEC;
}
break;
case PORT_RECEIVE_SM_DISCARD_EXEC:
p->rcvd_bpdu = p->rcvd_rstp = p->rcvd_stp = false;
p->rcvd_msg = false;
p->edge_delay_while = r->migrate_time;
p->port_receive_sm_state = PORT_RECEIVE_SM_DISCARD;
/* fall through */
case PORT_RECEIVE_SM_DISCARD:
if ((p->rcvd_bpdu || (p->edge_delay_while != r->migrate_time))
&& !p->port_enabled) {
/* Global transition. */
p->port_receive_sm_state = PORT_RECEIVE_SM_DISCARD_EXEC;
} else if (p->rcvd_bpdu && p->port_enabled) {
p->port_receive_sm_state = PORT_RECEIVE_SM_RECEIVE_EXEC;
}
break;
case PORT_RECEIVE_SM_RECEIVE_EXEC:
updt_bpdu_version(p);
p->oper_edge = p->rcvd_bpdu = false;
p->rcvd_msg = true;
p->edge_delay_while = r->migrate_time;
p->port_receive_sm_state = PORT_RECEIVE_SM_RECEIVE;
/* fall through */
case PORT_RECEIVE_SM_RECEIVE:
if ((p->rcvd_bpdu || (p->edge_delay_while != r->migrate_time))
&& !p->port_enabled) {
/* Global transition. */
p->port_receive_sm_state = PORT_RECEIVE_SM_DISCARD_EXEC;
} else if (p->rcvd_bpdu && p->port_enabled && !p->rcvd_msg) {
p->port_receive_sm_state = PORT_RECEIVE_SM_RECEIVE_EXEC;
}
break;
default:
OVS_NOT_REACHED();
/* fall through */
}
if (old_state != p->port_receive_sm_state) {
r->changes = true;
VLOG_DBG("%s, port %u: Port_receive_sm %d -> %d", p->rstp->name,
p->port_number, old_state, p->port_receive_sm_state);
}
return 0;
}
/* [17.24 - Port Protocol Migration state machine] */
static int
port_protocol_migration_sm(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
enum port_protocol_migration_state_machine old_state;
struct rstp *r;
old_state = p->port_protocol_migration_sm_state;
r = p->rstp;
switch (p->port_protocol_migration_sm_state) {
case PORT_PROTOCOL_MIGRATION_SM_INIT:
p->port_protocol_migration_sm_state =
PORT_PROTOCOL_MIGRATION_SM_CHECKING_RSTP_EXEC;
/* fall through */
case PORT_PROTOCOL_MIGRATION_SM_CHECKING_RSTP_EXEC:
p->mcheck = false;
p->send_rstp = r->rstp_version;
p->mdelay_while = r->migrate_time;
p->port_protocol_migration_sm_state =
PORT_PROTOCOL_MIGRATION_SM_CHECKING_RSTP;
/* fall through */
case PORT_PROTOCOL_MIGRATION_SM_CHECKING_RSTP:
if (p->mdelay_while == 0) {
p->port_protocol_migration_sm_state =
PORT_PROTOCOL_MIGRATION_SM_SENSING_EXEC;
} else if ((p->mdelay_while != r->migrate_time) && !p->port_enabled) {
p->port_protocol_migration_sm_state =
PORT_PROTOCOL_MIGRATION_SM_CHECKING_RSTP_EXEC;
}
break;
case PORT_PROTOCOL_MIGRATION_SM_SELECTING_STP_EXEC:
p->send_rstp = false;
p->mdelay_while = r->migrate_time;
p->port_protocol_migration_sm_state =
PORT_PROTOCOL_MIGRATION_SM_SELECTING_STP;
/* fall through */
case PORT_PROTOCOL_MIGRATION_SM_SELECTING_STP:
if ((p->mdelay_while == 0) || (!p->port_enabled) || p->mcheck) {
p->port_protocol_migration_sm_state =
PORT_PROTOCOL_MIGRATION_SM_SENSING_EXEC;
}
break;
case PORT_PROTOCOL_MIGRATION_SM_SENSING_EXEC:
p->rcvd_rstp = false;
p->rcvd_stp = false;
p->port_protocol_migration_sm_state =
PORT_PROTOCOL_MIGRATION_SM_SENSING;
/* fall through */
case PORT_PROTOCOL_MIGRATION_SM_SENSING:
if (!p->port_enabled || p->mcheck || ((r->rstp_version) &&
!p->send_rstp && p->rcvd_rstp)) {
p->port_protocol_migration_sm_state =
PORT_PROTOCOL_MIGRATION_SM_CHECKING_RSTP_EXEC;
} else if (p->send_rstp && p->rcvd_stp) {
p->port_protocol_migration_sm_state =
PORT_PROTOCOL_MIGRATION_SM_SELECTING_STP_EXEC;
}
break;
default:
OVS_NOT_REACHED();
/* fall through */
}
if (old_state != p->port_protocol_migration_sm_state) {
r->changes = true;
VLOG_DBG("%s, port %u: port_protocol_migration_sm %d -> %d",
p->rstp->name, p->port_number, old_state,
p->port_protocol_migration_sm_state);
}
return 0;
}
/* [17.25 - Bridge Detection state machine] */
static int
bridge_detection_sm(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
enum bridge_detection_state_machine old_state;
struct rstp *r;
old_state = p->bridge_detection_sm_state;
r = p->rstp;
switch (p->bridge_detection_sm_state) {
case BRIDGE_DETECTION_SM_INIT:
if (r->begin && p->admin_edge) {
p->bridge_detection_sm_state = BRIDGE_DETECTION_SM_EDGE_EXEC;
} else if (r->begin && !p->admin_edge) {
p->bridge_detection_sm_state = BRIDGE_DETECTION_SM_NOT_EDGE_EXEC;
}
break;
case BRIDGE_DETECTION_SM_EDGE_EXEC:
p->oper_edge = true;
p->bridge_detection_sm_state = BRIDGE_DETECTION_SM_EDGE;
/* fall through */
case BRIDGE_DETECTION_SM_EDGE:
if ((!p->port_enabled && !p->admin_edge) || !p->oper_edge) {
p->bridge_detection_sm_state = BRIDGE_DETECTION_SM_NOT_EDGE_EXEC;
}
break;
case BRIDGE_DETECTION_SM_NOT_EDGE_EXEC:
p->oper_edge = false;
p->bridge_detection_sm_state = BRIDGE_DETECTION_SM_NOT_EDGE;
/* fall through */
case BRIDGE_DETECTION_SM_NOT_EDGE:
if ((!p->port_enabled && p->admin_edge)
|| ((p->edge_delay_while == 0) && p->auto_edge && p->send_rstp
&& p->proposing)) {
p->bridge_detection_sm_state = BRIDGE_DETECTION_SM_EDGE_EXEC;
}
break;
default:
OVS_NOT_REACHED();
/* fall through */
}
if (old_state != p->bridge_detection_sm_state) {
r->changes = true;
VLOG_DBG("%s, port %u: bridge_detection_sm %d -> %d", p->rstp->name,
p->port_number, old_state, p->bridge_detection_sm_state);
}
return 0;
}
/* [17.26 - Port Transmit state machine] */
static void
rstp_send_bpdu(struct rstp_port *p, const void *bpdu, size_t bpdu_size)
OVS_REQUIRES(rstp_mutex)
{
struct eth_header *eth;
struct llc_header *llc;
struct dp_packet *pkt;
/* Skeleton. */
pkt = dp_packet_new(ETH_HEADER_LEN + LLC_HEADER_LEN + bpdu_size);
eth = dp_packet_put_zeros(pkt, sizeof *eth);
llc = dp_packet_put_zeros(pkt, sizeof *llc);
dp_packet_reset_offsets(pkt);
dp_packet_set_l3(pkt, dp_packet_put(pkt, bpdu, bpdu_size));
/* 802.2 header. */
eth->eth_dst = eth_addr_stp;
/* p->rstp->send_bpdu() must fill in source address. */
eth->eth_type = htons(dp_packet_size(pkt) - ETH_HEADER_LEN);
/* LLC header. */
llc->llc_dsap = STP_LLC_DSAP;
llc->llc_ssap = STP_LLC_SSAP;
llc->llc_cntl = STP_LLC_CNTL;
p->rstp->send_bpdu(pkt, p->aux, p->rstp->aux);
}
static void
record_agreement(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
struct rstp *r;
r = p->rstp;
if (r->rstp_version && p->oper_point_to_point_mac &&
((p->received_bpdu_buffer.flags & BPDU_FLAG_AGREEMENT))) {
p->agreed = true;
p->proposing = false;
} else {
p->agreed = false;
}
}
static void
set_tc_flags(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
/* Sets rcvd_tc and/or rcvd_tc_ack if the Topology Change and/or Topology
* Change Acknowledgment flags, respectively, are set in a ConfigBPDU or
* RST BPDU.
*/
if (p->received_bpdu_buffer.bpdu_type == CONFIGURATION_BPDU ||
p->received_bpdu_buffer.bpdu_type == RAPID_SPANNING_TREE_BPDU) {
if ((p->received_bpdu_buffer.flags & BPDU_FLAG_TOPCHANGE) != 0) {
p->rcvd_tc = true;
}
if ((p->received_bpdu_buffer.flags & BPDU_FLAG_TOPCHANGEACK) != 0) {
p->rcvd_tc_ack = true;
}
}
/* Sets rcvd_tcn true if the BPDU is a TCN BPDU. */
if (p->received_bpdu_buffer.bpdu_type
== TOPOLOGY_CHANGE_NOTIFICATION_BPDU) {
p->rcvd_tcn = true;
}
}
static void
record_dispute(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
if ((p->received_bpdu_buffer.flags & BPDU_FLAG_LEARNING) != 0) {
/* 802.1D-2004 says to set the agreed flag and to clear the proposing
* flag. 802.1q-2008 instead says to set the disputed variable and to
* clear the agreed variable. */
p->disputed = true;
p->agreed = false;
}
}
static void
record_proposal(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
enum port_flag role =
((p->received_bpdu_buffer.flags) & ROLE_FLAG_MASK) >> ROLE_FLAG_SHIFT;
if ((role == PORT_DES)
&& ((p->received_bpdu_buffer.flags & BPDU_FLAG_PROPOSAL) != 0)) {
p->proposed = true;
}
}
static void
record_priority(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
p->port_priority.root_bridge_id = p->msg_priority.root_bridge_id;
p->port_priority.root_path_cost = p->msg_priority.root_path_cost;
p->port_priority.designated_bridge_id =
p->msg_priority.designated_bridge_id;
p->port_priority.designated_port_id = p->msg_priority.designated_port_id;
}
static void
record_times(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
p->port_times = p->msg_times;
if (p->msg_times.hello_time == 0) {
p->port_times.hello_time = 1;
}
}
static void
updt_rcvd_info_while(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
/* [17.21.23]
* The value assigned to rcvdInfoWhile is the three times the Hello Time,
* if Message Age, incremented by 1 second and rounded to the nearest whole
* second, does not exceed Max Age, and is zero otherwise.
*/
if (p->port_times.message_age < p->port_times.max_age) {
p->rcvd_info_while = p->port_times.hello_time * 3;
} else {
p->rcvd_info_while = 0;
}
}
/* Times are internally held in seconds, while the protocol uses 1/256 seconds.
* time_encode() is used to convert time values sent in bpdus, while
* time_decode() is used to convert time values received in bpdus.
*/
static ovs_be16
time_encode(uint8_t value)
{
return htons(value * 256);
}
static uint8_t
time_decode(ovs_be16 encoded)
{
return ntohs(encoded) / 256;
}
/* [17.21.19] */
static void
tx_config(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
struct rstp_bpdu bpdu;
bpdu.protocol_identifier = htons(0);
bpdu.protocol_version_identifier = 0;
bpdu.bpdu_type = CONFIGURATION_BPDU;
bpdu.root_bridge_id = htonll(p->designated_priority_vector.root_bridge_id);
bpdu.root_path_cost = htonl(p->designated_priority_vector.root_path_cost);
bpdu.designated_bridge_id =
htonll(p->designated_priority_vector.designated_bridge_id);
bpdu.designated_port_id =
htons(p->designated_priority_vector.designated_port_id);
bpdu.message_age = time_encode(p->designated_times.message_age);
bpdu.max_age = time_encode(p->designated_times.max_age);
bpdu.hello_time = time_encode(p->designated_times.hello_time);
bpdu.forward_delay = time_encode(p->designated_times.forward_delay);
bpdu.flags = 0;
if (p->tc_while != 0) {
bpdu.flags |= BPDU_FLAG_TOPCHANGE;
}
if (p->tc_ack != 0) {
bpdu.flags |= BPDU_FLAG_TOPCHANGEACK;
}
rstp_send_bpdu(p, &bpdu, sizeof(struct rstp_bpdu));
}
/* [17.21.20] */
static void
tx_rstp(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
struct rstp_bpdu bpdu;
bpdu.protocol_identifier = htons(0);
bpdu.protocol_version_identifier = 2;
bpdu.bpdu_type = RAPID_SPANNING_TREE_BPDU;
bpdu.root_bridge_id = htonll(p->designated_priority_vector.root_bridge_id);
bpdu.root_path_cost = htonl(p->designated_priority_vector.root_path_cost);
bpdu.designated_bridge_id =
htonll(p->designated_priority_vector.designated_bridge_id);
bpdu.designated_port_id =
htons(p->designated_priority_vector.designated_port_id);
bpdu.message_age = time_encode(p->designated_times.message_age);
bpdu.max_age = time_encode(p->designated_times.max_age);
bpdu.hello_time = time_encode(p->designated_times.hello_time);
bpdu.forward_delay = time_encode(p->designated_times.forward_delay);
bpdu.flags = 0;
switch (p->role) {
case ROLE_ROOT:
bpdu.flags = PORT_ROOT << ROLE_FLAG_SHIFT;
break;
case ROLE_DESIGNATED:
bpdu.flags = PORT_DES << ROLE_FLAG_SHIFT;
break;
case ROLE_ALTERNATE:
case ROLE_BACKUP:
bpdu.flags = PORT_ALT_BACK << ROLE_FLAG_SHIFT;
break;
case ROLE_DISABLED:
/* Should not happen! */
VLOG_ERR("%s transmitting bpdu in disabled role on port "
RSTP_PORT_ID_FMT, p->rstp->name, p->port_id);
break;
}
if (p->agree) {
bpdu.flags |= BPDU_FLAG_AGREEMENT;
}
if (p->proposing) {
bpdu.flags |= BPDU_FLAG_PROPOSAL;
}
if (p->tc_while != 0) {
bpdu.flags |= BPDU_FLAG_TOPCHANGE;
}
if (p->learning) {
bpdu.flags |= BPDU_FLAG_LEARNING;
}
if (p->forwarding) {
bpdu.flags |= BPDU_FLAG_FORWARDING;
}
bpdu.version1_length = 0;
rstp_send_bpdu(p, &bpdu, sizeof(struct rstp_bpdu));
}
/* [17.21.21] */
static void
tx_tcn(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
struct rstp_bpdu bpdu;
memset(&bpdu, 0, sizeof(struct rstp_bpdu));
bpdu.protocol_identifier = htons(0);
bpdu.protocol_version_identifier = 0;
bpdu.bpdu_type = TOPOLOGY_CHANGE_NOTIFICATION_BPDU;
rstp_send_bpdu(p, &bpdu, sizeof(struct rstp_bpdu));
}
static int
port_transmit_sm(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
enum port_transmit_state_machine old_state;
struct rstp *r;
old_state = p->port_transmit_sm_state;
r = p->rstp;
switch (p->port_transmit_sm_state) {
case PORT_TRANSMIT_SM_INIT:
if (r->begin) {
p->port_transmit_sm_state = PORT_TRANSMIT_SM_TRANSMIT_INIT_EXEC;
}
break;
case PORT_TRANSMIT_SM_TRANSMIT_INIT_EXEC:
p->new_info = true;
p->tx_count = 0;
p->port_transmit_sm_state = PORT_TRANSMIT_SM_TRANSMIT_INIT;
/* fall through */
case PORT_TRANSMIT_SM_TRANSMIT_INIT:
p->port_transmit_sm_state = PORT_TRANSMIT_SM_IDLE_EXEC;
break;
case PORT_TRANSMIT_SM_TRANSMIT_PERIODIC_EXEC:
p->new_info = p->new_info || (p->role == ROLE_DESIGNATED ||
(p->role == ROLE_ROOT && p->tc_while != 0));
p->port_transmit_sm_state = PORT_TRANSMIT_SM_TRANSMIT_PERIODIC;
/* fall through */
case PORT_TRANSMIT_SM_TRANSMIT_PERIODIC:
p->port_transmit_sm_state = PORT_TRANSMIT_SM_IDLE_EXEC;
break;
case PORT_TRANSMIT_SM_IDLE_EXEC:
p->hello_when = r->bridge_hello_time;
p->port_transmit_sm_state = PORT_TRANSMIT_SM_IDLE;
/* fall through */
case PORT_TRANSMIT_SM_IDLE:
if (p->role == ROLE_DISABLED) {
VLOG_DBG("%s, port %u: port_transmit_sm ROLE == DISABLED.",
p->rstp->name, p->port_number);
break;
} else if (p->send_rstp && p->new_info
&& p->tx_count < r->transmit_hold_count
&& p->hello_when != 0 && p->selected && !p->updt_info) {
p->port_transmit_sm_state = PORT_TRANSMIT_SM_TRANSMIT_RSTP_EXEC;
} else if (p->hello_when == 0 && p->selected && !p->updt_info) {
p->port_transmit_sm_state =
PORT_TRANSMIT_SM_TRANSMIT_PERIODIC_EXEC;
} else if (!p->send_rstp && p->new_info && p->role == ROLE_ROOT
&& p->tx_count < r->transmit_hold_count
&& p->hello_when != 0 && p->selected && !p->updt_info) {
p->port_transmit_sm_state = PORT_TRANSMIT_SM_TRANSMIT_TCN_EXEC;
} else if (!p->send_rstp && p->new_info && p->role == ROLE_DESIGNATED
&& p->tx_count < r->transmit_hold_count
&& p->hello_when != 0 && p->selected && !p->updt_info) {
p->port_transmit_sm_state = PORT_TRANSMIT_SM_TRANSMIT_CONFIG_EXEC;
}
break;
case PORT_TRANSMIT_SM_TRANSMIT_CONFIG_EXEC:
p->new_info = false;
tx_config(p);
p->tx_count += 1;
p->tc_ack = false;
p->port_transmit_sm_state = PORT_TRANSMIT_SM_TRANSMIT_CONFIG;
/* fall through */
case PORT_TRANSMIT_SM_TRANSMIT_CONFIG:
p->port_transmit_sm_state = PORT_TRANSMIT_SM_IDLE_EXEC;
break;
case PORT_TRANSMIT_SM_TRANSMIT_TCN_EXEC:
p->new_info = false;
tx_tcn(p);
p->tx_count += 1;
p->port_transmit_sm_state = PORT_TRANSMIT_SM_TRANSMIT_TCN;
/* fall through */
case PORT_TRANSMIT_SM_TRANSMIT_TCN:
p->port_transmit_sm_state = PORT_TRANSMIT_SM_IDLE_EXEC;
break;
case PORT_TRANSMIT_SM_TRANSMIT_RSTP_EXEC:
p->new_info = false;
tx_rstp(p);
p->tx_count += 1;
p->tc_ack = false;
p->port_transmit_sm_state = PORT_TRANSMIT_SM_TRANSMIT_RSTP;
/* fall through */
case PORT_TRANSMIT_SM_TRANSMIT_RSTP:
p->port_transmit_sm_state = PORT_TRANSMIT_SM_IDLE_EXEC;
break;
default:
OVS_NOT_REACHED();
/* fall through */
}
if (old_state != p->port_transmit_sm_state) {
r->changes = true;
VLOG_DBG("%s, port %u: port_transmit_sm %d -> %d", p->rstp->name,
p->port_number, old_state, p->port_transmit_sm_state);
}
return 0;
}
/* [17.27 Port Information state machine] */
#define RECEIVED 0
#define MINE 1
static int
rcv_info(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
enum vector_comparison cp;
bool ct;
enum port_flag role;
p->msg_priority.root_bridge_id =
ntohll(p->received_bpdu_buffer.root_bridge_id);
p->msg_priority.root_path_cost =
ntohl(p->received_bpdu_buffer.root_path_cost);
p->msg_priority.designated_bridge_id =
ntohll(p->received_bpdu_buffer.designated_bridge_id);
p->msg_priority.designated_port_id =
ntohs(p->received_bpdu_buffer.designated_port_id);
p->msg_times.forward_delay =
time_decode(p->received_bpdu_buffer.forward_delay);
p->msg_times.hello_time = time_decode(p->received_bpdu_buffer.hello_time);
p->msg_times.max_age = time_decode(p->received_bpdu_buffer.max_age);
p->msg_times.message_age =
time_decode(p->received_bpdu_buffer.message_age);
cp = compare_rstp_priority_vectors(&p->msg_priority, &p->port_priority);
ct = rstp_times_equal(&p->port_times, &p->msg_times);
/* Configuration BPDU conveys a Designated Port Role. */
if (p->received_bpdu_buffer.bpdu_type == CONFIGURATION_BPDU) {
role = PORT_DES;
} else {
role =
(p->received_bpdu_buffer.flags & ROLE_FLAG_MASK) >> ROLE_FLAG_SHIFT;
}
/* 802.1D-2004 does not report this behaviour.
* 802.1Q-2008 says set rcvdTcn. */
if (p->received_bpdu_buffer.bpdu_type ==
TOPOLOGY_CHANGE_NOTIFICATION_BPDU) {
p->rcvd_tcn = true;
return OTHER_INFO;
}
/* Returns SuperiorDesignatedInfo if:
* a) The received message conveys a Designated Port Role, and
* 1) The message priority is superior (17.6) to the Port.s port priority
* vector, or
* 2) The message priority vector is the same as the Port.s port priority
* vector, and any of the received timer parameter values (msg_times.
* 17.19.15) differ from those already held for the Port (port_times
* 17.19.22).
* NOTE: Configuration BPDU explicitly conveys a Designated Port Role.
*/
if (role == PORT_DES && (cp == SUPERIOR || (cp == SAME && ct == false))) {
return SUPERIOR_DESIGNATED_INFO;
/* Returns RepeatedDesignatedInfo if:
* b) The received message conveys Designated Port Role, and a message
* priority vector and timer parameters that are the same as the
* Port's port priority vector or timer values. */
} else if (role == PORT_DES && cp == SAME && ct == true) {
return REPEATED_DESIGNATED_INFO;
/* Returns InferiorDesignatedInfo if:
* c) The received message conveys a Designated Port Role, and a
* message priority vector that is worse than the Port's port
* priority vector. */
} else if (role == PORT_DES && cp == INFERIOR) {
return INFERIOR_DESIGNATED_INFO;
/* Returns InferiorRootAlternateInfo if:
* d) The received message conveys a Root Port, Alternate Port, or
* Backup Port Role and a message priority that is the same as or
* worse than the port priority vector. */
} else if ((role == PORT_ROOT || role == PORT_ALT_BACK) &&
(cp == INFERIOR || cp == SAME)) {
return INFERIOR_ROOT_ALTERNATE_INFO;
/* Otherwise, returns OtherInfo. */
} else {
return OTHER_INFO;
}
}
static int
better_or_same_info(struct rstp_port *p, int new_info_is)
OVS_REQUIRES(rstp_mutex)
{
return
(new_info_is == RECEIVED && p->info_is == INFO_IS_RECEIVED
&& compare_rstp_priority_vectors(&p->msg_priority,
&p->port_priority))
|| (new_info_is == MINE && p->info_is == INFO_IS_MINE
&& compare_rstp_priority_vectors(&p->designated_priority_vector,
&p->port_priority));
}
static int
port_information_sm(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
enum port_information_state_machine old_state;
struct rstp *r;
struct rstp_port *p1;
old_state = p->port_information_sm_state;
r = p->rstp;
switch (p->port_information_sm_state) {
case PORT_INFORMATION_SM_INIT:
if (r->begin
|| (!p->port_enabled && p->info_is != INFO_IS_DISABLED)) {
p->port_information_sm_state = PORT_INFORMATION_SM_DISABLED_EXEC;
}
break;
case PORT_INFORMATION_SM_DISABLED_EXEC:
p->rcvd_msg = false;
p->proposing = p->proposed = p->agree = p->agreed = false;
p->rcvd_info_while = 0;
p->info_is = INFO_IS_DISABLED;
p->reselect = true;
p->selected = false;
p->port_information_sm_state = PORT_INFORMATION_SM_DISABLED;
/* fall through */
case PORT_INFORMATION_SM_DISABLED:
if (!p->port_enabled && p->info_is != INFO_IS_DISABLED) {
/* Global transition. */
p->port_information_sm_state = PORT_INFORMATION_SM_DISABLED_EXEC;
} else if (p->port_enabled) {
p->port_information_sm_state = PORT_INFORMATION_SM_AGED_EXEC;
} else if (p->rcvd_msg) {
p->port_information_sm_state = PORT_INFORMATION_SM_DISABLED_EXEC;
}
break;
case PORT_INFORMATION_SM_AGED_EXEC:
p->info_is = INFO_IS_AGED;
p->reselect = true;
p->selected = false;
p->port_information_sm_state = PORT_INFORMATION_SM_AGED;
/* fall through */
case PORT_INFORMATION_SM_AGED:
if (!p->port_enabled && p->info_is != INFO_IS_DISABLED) {
/* Global transition. */
p->port_information_sm_state = PORT_INFORMATION_SM_DISABLED_EXEC;
} else if (p->selected && p->updt_info) {
p->port_information_sm_state = PORT_INFORMATION_SM_UPDATE_EXEC;
}
break;
case PORT_INFORMATION_SM_UPDATE_EXEC:
p->proposing = p->proposed = false;
/* MINE is not specified in Standard 802.1D-2004. */
p->agreed = p->agreed && better_or_same_info(p, MINE);
p->synced = p->synced && p->agreed;
p->port_priority.root_bridge_id =
p->designated_priority_vector.root_bridge_id;
p->port_priority.root_path_cost =
p->designated_priority_vector.root_path_cost;
p->port_priority.designated_bridge_id =
p->designated_priority_vector.designated_bridge_id;
p->port_priority.designated_port_id =
p->designated_priority_vector.designated_port_id;
p->port_times = p->designated_times;
p->updt_info = false;
p->info_is = INFO_IS_MINE;
p->new_info = true;
p->port_information_sm_state = PORT_INFORMATION_SM_UPDATE;
/* fall through */
case PORT_INFORMATION_SM_UPDATE:
if (!p->port_enabled && p->info_is != INFO_IS_DISABLED) {
/* Global transition. */
p->port_information_sm_state = PORT_INFORMATION_SM_DISABLED_EXEC;
} else {
p->port_information_sm_state = PORT_INFORMATION_SM_CURRENT_EXEC;
}
break;
case PORT_INFORMATION_SM_CURRENT_EXEC:
p->port_information_sm_state = PORT_INFORMATION_SM_CURRENT;
/* fall through */
case PORT_INFORMATION_SM_CURRENT:
if (!p->port_enabled && p->info_is != INFO_IS_DISABLED) {
/* Global transition. */
p->port_information_sm_state = PORT_INFORMATION_SM_DISABLED_EXEC;
} else if (p->rcvd_msg && !p->updt_info) {
p->port_information_sm_state = PORT_INFORMATION_SM_RECEIVE_EXEC;
} else if (p->selected && p->updt_info) {
p->port_information_sm_state = PORT_INFORMATION_SM_UPDATE_EXEC;
} else if ((p->info_is == INFO_IS_RECEIVED) &&
(p->rcvd_info_while == 0) && !p->updt_info &&
!p->rcvd_msg) {
p->port_information_sm_state = PORT_INFORMATION_SM_AGED_EXEC;
}
break;
case PORT_INFORMATION_SM_RECEIVE_EXEC:
p->rcvd_info = rcv_info(p);
p->port_information_sm_state = PORT_INFORMATION_SM_RECEIVE;
/* fall through */
case PORT_INFORMATION_SM_RECEIVE:
if (!p->port_enabled && p->info_is != INFO_IS_DISABLED) {
/* Global transition. */
p->port_information_sm_state = PORT_INFORMATION_SM_DISABLED_EXEC;
} else {
switch (p->rcvd_info) {
case SUPERIOR_DESIGNATED_INFO:
/* 802.1q-2008 has a checkBPDUConsistency() function, called on
* a BPDU reception. checkBPDUConsistency() clears the agreed
* variable if the received message priority vector is superior
* to the port priority vector, the BPDU is an ST BPDU or an
* RST BPDU, its port role is Designated and its Learning flag
* is set. */
if (p->received_bpdu_buffer.flags & BPDU_FLAG_LEARNING) {
HMAP_FOR_EACH (p1, node, &r->ports) {
if (p1->port_number != p->port_number) {
p1->agreed = false;
}
}
}
p->port_information_sm_state =
PORT_INFORMATION_SM_SUPERIOR_DESIGNATED_EXEC;
break;
case REPEATED_DESIGNATED_INFO:
p->port_information_sm_state =
PORT_INFORMATION_SM_REPEATED_DESIGNATED_EXEC;
break;
case INFERIOR_DESIGNATED_INFO:
p->port_information_sm_state =
PORT_INFORMATION_SM_INFERIOR_DESIGNATED_EXEC;
break;
case INFERIOR_ROOT_ALTERNATE_INFO:
p->port_information_sm_state =
PORT_INFORMATION_SM_NOT_DESIGNATED_EXEC;
break;
case OTHER_INFO:
p->port_information_sm_state = PORT_INFORMATION_SM_OTHER_EXEC;
break;
default:
OVS_NOT_REACHED();
/* fall through */
}
}
break;
case PORT_INFORMATION_SM_OTHER_EXEC:
p->rcvd_msg = false;
p->port_information_sm_state = PORT_INFORMATION_SM_OTHER;
/* fall through */
case PORT_INFORMATION_SM_OTHER:
if (!p->port_enabled && p->info_is != INFO_IS_DISABLED) {
/* Global transition. */
p->port_information_sm_state = PORT_INFORMATION_SM_DISABLED_EXEC;
} else {
p->port_information_sm_state = PORT_INFORMATION_SM_CURRENT_EXEC;
}
break;
case PORT_INFORMATION_SM_NOT_DESIGNATED_EXEC:
record_agreement(p);
set_tc_flags(p);
p->rcvd_msg = false;
p->port_information_sm_state = PORT_INFORMATION_SM_NOT_DESIGNATED;
/* fall through */
case PORT_INFORMATION_SM_NOT_DESIGNATED:
if (!p->port_enabled && p->info_is != INFO_IS_DISABLED) {
/* Global transition. */
p->port_information_sm_state = PORT_INFORMATION_SM_DISABLED_EXEC;
} else {
p->port_information_sm_state = PORT_INFORMATION_SM_CURRENT_EXEC;
}
break;
case PORT_INFORMATION_SM_INFERIOR_DESIGNATED_EXEC:
record_dispute(p);
p->rcvd_msg = false;
p->port_information_sm_state = PORT_INFORMATION_SM_INFERIOR_DESIGNATED;
/* fall through */
case PORT_INFORMATION_SM_INFERIOR_DESIGNATED:
if (!p->port_enabled && p->info_is != INFO_IS_DISABLED) {
/* Global transition. */
p->port_information_sm_state = PORT_INFORMATION_SM_DISABLED_EXEC;
} else {
p->port_information_sm_state = PORT_INFORMATION_SM_CURRENT_EXEC;
}
break;
case PORT_INFORMATION_SM_REPEATED_DESIGNATED_EXEC:
record_proposal(p);
set_tc_flags(p);
/* This record_agreement() is missing in 802.1D-2004, but it's present
* in 802.1q-2008. */
record_agreement(p);
updt_rcvd_info_while(p);
p->rcvd_msg = false;
p->port_information_sm_state = PORT_INFORMATION_SM_REPEATED_DESIGNATED;
/* fall through */
case PORT_INFORMATION_SM_REPEATED_DESIGNATED:
if (!p->port_enabled && p->info_is != INFO_IS_DISABLED) {
/* Global transition. */
p->port_information_sm_state = PORT_INFORMATION_SM_DISABLED_EXEC;
} else {
p->port_information_sm_state = PORT_INFORMATION_SM_CURRENT_EXEC;
}
break;
case PORT_INFORMATION_SM_SUPERIOR_DESIGNATED_EXEC:
p->agreed = p->proposing = false;
record_proposal(p);
set_tc_flags(p);
/* RECEIVED is not specified in Standard 802.1D-2004. */
p->agree = p->agree && better_or_same_info(p, RECEIVED);
/* This record_agreement() and the synced assignment are missing in
* 802.1D-2004, but they're present in 802.1q-2008. */
record_agreement(p);
p->synced = p->synced && p->agreed;
record_priority(p);
record_times(p);
updt_rcvd_info_while(p);
p->info_is = INFO_IS_RECEIVED;
p->reselect = true;
p->selected = false;
p->rcvd_msg = false;
p->port_information_sm_state = PORT_INFORMATION_SM_SUPERIOR_DESIGNATED;
/* fall through */
case PORT_INFORMATION_SM_SUPERIOR_DESIGNATED:
if (!p->port_enabled && p->info_is != INFO_IS_DISABLED) {
/* Global transition. */
p->port_information_sm_state = PORT_INFORMATION_SM_DISABLED_EXEC;
} else {
p->port_information_sm_state = PORT_INFORMATION_SM_CURRENT_EXEC;
}
break;
default:
OVS_NOT_REACHED();
/* fall through */
}
if (old_state != p->port_information_sm_state) {
r->changes = true;
VLOG_DBG("%s, port %u: Port_information_sm %d -> %d", p->rstp->name,
p->port_number, old_state, p->port_information_sm_state);
}
return 0;
}
/* [17.29 Port Role Transitions state machine] */
static void
set_re_root_tree(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
struct rstp *r;
struct rstp_port *p1;
r = p->rstp;
HMAP_FOR_EACH (p1, node, &r->ports) {
p1->re_root = true;
}
}
static void
set_sync_tree(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
struct rstp *r;
struct rstp_port *p1;
r = p->rstp;
HMAP_FOR_EACH (p1, node, &r->ports) {
p1->sync = true;
}
}
static int
hello_time(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
return p->designated_times.hello_time;
}
static int
fwd_delay(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
return p->designated_times.forward_delay;
}
static int
forward_delay(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
if (p->send_rstp) {
return hello_time(p);
} else {
return fwd_delay(p);
}
}
static int
edge_delay(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
struct rstp *r;
r = p->rstp;
if (p->oper_point_to_point_mac == 1) {
return r->migrate_time;
} else {
return p->designated_times.max_age;
}
}
static int
check_selected_role_change(struct rstp_port *p, int current_role_state)
OVS_REQUIRES(rstp_mutex)
{
if (p->selected && !p->updt_info && p->role != p->selected_role
&& p->selected_role != current_role_state) {
VLOG_DBG("%s, port %u: case: current = %s role = %s selected = %d",
p->rstp->name, p->port_number,
rstp_port_role_name(current_role_state),
rstp_port_role_name(p->role), p->selected_role);
switch (p->selected_role) {
case ROLE_ROOT:
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_ROOT_PORT_EXEC;
return true;
case ROLE_DESIGNATED:
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_DESIGNATED_PORT_EXEC;
return true;
case ROLE_ALTERNATE:
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_BLOCK_PORT_EXEC;
return true;
case ROLE_BACKUP:
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_BLOCK_PORT_EXEC;
return true;
case ROLE_DISABLED:
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_DISABLE_PORT_EXEC;
return true;
}
}
return false;
}
static int
re_rooted(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
struct rstp *r;
struct rstp_port *p1;
r = p->rstp;
HMAP_FOR_EACH (p1, node, &r->ports) {
if ((p1 != p) && (p1->rr_while != 0)) {
return false;
}
}
return true;
}
static int
all_synced(struct rstp *r)
OVS_REQUIRES(rstp_mutex)
{
struct rstp_port *p;
HMAP_FOR_EACH (p, node, &r->ports) {
if (!(p->selected && p->role == p->selected_role &&
(p->role == ROLE_ROOT || p->synced == true))) {
return false;
}
}
return true;
}
static int
port_role_transition_sm(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
enum port_role_transition_state_machine old_state;
struct rstp *r;
enum rstp_port_role last_role;
old_state = p->port_role_transition_sm_state;
r = p->rstp;
last_role = p->role;
switch (p->port_role_transition_sm_state) {
case PORT_ROLE_TRANSITION_SM_INIT:
if (r->begin) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_INIT_PORT_EXEC;
}
break;
case PORT_ROLE_TRANSITION_SM_INIT_PORT_EXEC:
p->role = ROLE_DISABLED;
p->learn = p->forward = false;
p->synced = false;
p->sync = p->re_root = true;
p->rr_while = p->designated_times.forward_delay;
p->fd_while = p->designated_times.max_age;
p->rb_while = 0;
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_DISABLE_PORT_EXEC;
break;
case PORT_ROLE_TRANSITION_SM_DISABLE_PORT_EXEC:
p->role = p->selected_role;
p->learn = p->forward = false;
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_DISABLE_PORT;
/* fall through */
case PORT_ROLE_TRANSITION_SM_DISABLE_PORT:
if (check_selected_role_change(p, ROLE_DISABLED)) {
/* Global transition. */
} else if (p->selected && !p->updt_info && !p->learning
&& !p->forwarding) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_DISABLED_PORT_EXEC;
}
break;
case PORT_ROLE_TRANSITION_SM_DISABLED_PORT_EXEC:
p->fd_while = p->designated_times.max_age;
p->synced = true;
p->rr_while = 0;
p->sync = p->re_root = false;
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_DISABLED_PORT;
/* fall through */
case PORT_ROLE_TRANSITION_SM_DISABLED_PORT:
if (check_selected_role_change(p, ROLE_DISABLED)) {
/* Global transition. */
} else if (p->selected && !p->updt_info
&& (p->fd_while != p->designated_times.max_age || p->sync
|| p->re_root || !p->synced)) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_DISABLED_PORT_EXEC;
}
break;
case PORT_ROLE_TRANSITION_SM_ROOT_PORT_EXEC:
p->role = ROLE_ROOT;
p->rr_while = p->designated_times.forward_delay;
p->port_role_transition_sm_state = PORT_ROLE_TRANSITION_SM_ROOT_PORT;
/* fall through */
case PORT_ROLE_TRANSITION_SM_ROOT_PORT:
if (check_selected_role_change(p, ROLE_ROOT)) {
/* Global transition. */
} else if (p->selected && !p->updt_info) {
if (p->rr_while != p->designated_times.forward_delay) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_ROOT_PORT_EXEC;
break;
} else if (p->re_root && p->forward) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_REROOTED_EXEC;
break;
} else if ((p->fd_while == 0
|| ((re_rooted(p) && p->rb_while == 0)
&& r->rstp_version)) && !p->learn) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_ROOT_LEARN_EXEC;
break;
} else if ((p->fd_while == 0
|| ((re_rooted(p) && p->rb_while == 0)
&& r->rstp_version)) && p->learn && !p->forward) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_ROOT_FORWARD_EXEC;
break;
} else if (p->proposed && !p->agree) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_ROOT_PROPOSED_EXEC;
break;
} else if ((all_synced(r) && !p->agree) ||
(p->proposed && p->agree)) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_ROOT_AGREED_EXEC;
break;
} else if (!p->forward && !p->re_root) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_REROOT_EXEC;
break;
}
}
break;
case PORT_ROLE_TRANSITION_SM_REROOT_EXEC:
if (check_selected_role_change(p, ROLE_ROOT)) {
/* Global transition. */
} else {
set_re_root_tree(p);
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_ROOT_PORT_EXEC;
}
break;
case PORT_ROLE_TRANSITION_SM_ROOT_AGREED_EXEC:
if (check_selected_role_change(p, ROLE_ROOT)) {
/* Global transition. */
} else {
p->proposed = p->sync = false;
p->agree = p->new_info = true;
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_ROOT_PORT_EXEC;
}
break;
case PORT_ROLE_TRANSITION_SM_ROOT_PROPOSED_EXEC:
set_sync_tree(p);
p->proposed = false;
if (check_selected_role_change(p, ROLE_ROOT)) {
/* Global transition. */
} else {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_ROOT_PORT_EXEC;
}
break;
case PORT_ROLE_TRANSITION_SM_ROOT_FORWARD_EXEC:
p->fd_while = 0;
p->forward = true;
if (check_selected_role_change(p, ROLE_ROOT)) {
/* Global transition. */
} else {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_ROOT_PORT_EXEC;
}
break;
case PORT_ROLE_TRANSITION_SM_ROOT_LEARN_EXEC:
p->fd_while = forward_delay(p);
p->learn = true;
if (check_selected_role_change(p, ROLE_ROOT)) {
/* Global transition. */
} else {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_ROOT_PORT_EXEC;
}
break;
case PORT_ROLE_TRANSITION_SM_REROOTED_EXEC:
p->re_root = false;
if (check_selected_role_change(p, ROLE_ROOT)) {
/* Global transition. */
} else {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_ROOT_PORT_EXEC;
}
break;
case PORT_ROLE_TRANSITION_SM_DESIGNATED_PORT_EXEC:
p->role = ROLE_DESIGNATED;
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_DESIGNATED_PORT;
/* fall through */
case PORT_ROLE_TRANSITION_SM_DESIGNATED_PORT:
if (check_selected_role_change(p, ROLE_DESIGNATED)) {
/* Global transition. */
} else if (p->selected && !p->updt_info) {
if (((p->sync && !p->synced)
|| (p->re_root && p->rr_while != 0) || p->disputed)
&& !p->oper_edge && (p->learn || p->forward)) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_DESIGNATED_DISCARD_EXEC;
} else if ((p->fd_while == 0 || p->agreed || p->oper_edge)
&& (p->rr_while == 0 || !p->re_root)
&& !p->sync && !p->learn) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_DESIGNATED_LEARN_EXEC;
} else if ((p->fd_while == 0 || p->agreed || p->oper_edge)
&& (p->rr_while == 0 || !p->re_root)
&& !p->sync && (p->learn && !p->forward)) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_DESIGNATED_FORWARD_EXEC;
} else if (!p->forward && !p->agreed && !p->proposing &&
!p->oper_edge) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_DESIGNATED_PROPOSE_EXEC;
} else if ((!p->learning && !p->forwarding && !p->synced)
|| (p->agreed && !p->synced)
|| (p->oper_edge && !p->synced)
|| (p->sync && p->synced)) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_DESIGNATED_SYNCED_EXEC;
} else if (p->rr_while == 0 && p->re_root) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_DESIGNATED_RETIRED_EXEC;
}
}
break;
case PORT_ROLE_TRANSITION_SM_DESIGNATED_RETIRED_EXEC:
p->re_root = false;
if (check_selected_role_change(p, ROLE_DESIGNATED)) {
/* Global transition. */
} else {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_DESIGNATED_PORT_EXEC;
}
break;
case PORT_ROLE_TRANSITION_SM_DESIGNATED_SYNCED_EXEC:
p->rr_while = 0;
p->synced = true;
p->sync = false;
if (check_selected_role_change(p, ROLE_DESIGNATED)) {
/* Global transition. */
} else {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_DESIGNATED_PORT_EXEC;
}
break;
case PORT_ROLE_TRANSITION_SM_DESIGNATED_PROPOSE_EXEC:
p->proposing = true;
p->edge_delay_while = edge_delay(p);
p->new_info = true;
if (check_selected_role_change(p, ROLE_DESIGNATED)) {
/* Global transition. */
} else {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_DESIGNATED_PORT_EXEC;
}
break;
case PORT_ROLE_TRANSITION_SM_DESIGNATED_FORWARD_EXEC:
p->forward = true;
p->fd_while = 0;
p->agreed = p->send_rstp;
if (check_selected_role_change(p, ROLE_DESIGNATED)) {
/* Global transition. */
} else {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_DESIGNATED_PORT_EXEC;
}
break;
case PORT_ROLE_TRANSITION_SM_DESIGNATED_LEARN_EXEC:
p->learn = true;
p->fd_while = forward_delay(p);
if (check_selected_role_change(p, ROLE_DESIGNATED)) {
/* Global transition. */
} else {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_DESIGNATED_PORT_EXEC;
}
break;
case PORT_ROLE_TRANSITION_SM_DESIGNATED_DISCARD_EXEC:
p->learn = p->forward = p->disputed = false;
p->fd_while = forward_delay(p);
if (check_selected_role_change(p, ROLE_DESIGNATED)) {
/* Global transition. */
} else {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_DESIGNATED_PORT_EXEC;
}
break;
case PORT_ROLE_TRANSITION_SM_ALTERNATE_PORT_EXEC:
p->fd_while = p->designated_times.forward_delay;
p->synced = true;
p->rr_while = 0;
p->sync = p->re_root = false;
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_ALTERNATE_PORT;
/* fall through */
case PORT_ROLE_TRANSITION_SM_ALTERNATE_PORT:
if (check_selected_role_change(p, ROLE_ALTERNATE)) {
/* Global transition. */
} else if (p->selected && !p->updt_info) {
if (p->rb_while != 2 * p->designated_times.hello_time
&& p->role == ROLE_BACKUP) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_BACKUP_PORT_EXEC;
} else if ((p->fd_while != forward_delay(p)) || p->sync
|| p->re_root || !p->synced) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_ALTERNATE_PORT_EXEC;
} else if (p->proposed && !p->agree) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_ALTERNATE_PROPOSED_EXEC;
} else if ((all_synced(r) && !p->agree)
|| (p->proposed && p->agree)) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_ALTERNATE_AGREED_EXEC;
}
}
break;
case PORT_ROLE_TRANSITION_SM_ALTERNATE_AGREED_EXEC:
p->proposed = false;
p->agree = true;
p->new_info = true;
if (check_selected_role_change(p, ROLE_ALTERNATE)) {
/* Global transition. */
} else {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_ALTERNATE_PORT_EXEC;
}
break;
case PORT_ROLE_TRANSITION_SM_ALTERNATE_PROPOSED_EXEC:
set_sync_tree(p);
p->proposed = false;
if (check_selected_role_change(p, ROLE_ALTERNATE)) {
/* Global transition. */
} else {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_ALTERNATE_PORT_EXEC;
}
break;
case PORT_ROLE_TRANSITION_SM_BLOCK_PORT_EXEC:
p->role = p->selected_role;
p->learn = p->forward = false;
p->port_role_transition_sm_state = PORT_ROLE_TRANSITION_SM_BLOCK_PORT;
/* fall through */
case PORT_ROLE_TRANSITION_SM_BLOCK_PORT:
if (check_selected_role_change(p, ROLE_ALTERNATE)) {
/* Global transition. */
} else if (p->selected && !p->updt_info && !p->learning &&
!p->forwarding) {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_ALTERNATE_PORT_EXEC;
}
break;
case PORT_ROLE_TRANSITION_SM_BACKUP_PORT_EXEC:
p->rb_while = 2 * p->designated_times.hello_time;
if (check_selected_role_change(p, ROLE_ALTERNATE)) {
/* Global transition. */
} else {
p->port_role_transition_sm_state =
PORT_ROLE_TRANSITION_SM_ALTERNATE_PORT_EXEC;
}
break;
default:
OVS_NOT_REACHED();
/* fall through */
}
if (old_state != p->port_role_transition_sm_state) {
r->changes = true;
VLOG_DBG("%s, port %u: Port_role_transition_sm %d -> %d",
p->rstp->name, p->port_number, old_state,
p->port_role_transition_sm_state);
}
if (last_role != p->role) {
VLOG_DBG("%s, port %u, port role ["RSTP_PORT_ID_FMT"] = %s",
p->rstp->name, p->port_number, p->port_id,
rstp_port_role_name(p->role));
}
return 0;
}
/* [17.30 - Port state transition state machine] */
static void
enable_learning(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
/* [17.21.6 enableLearning()] An implementation dependent procedure that
* causes the Learning Process (7.8) to start learning from frames received
* on the Port. The procedure does not complete until learning has been
* enabled.
*/
rstp_port_set_state__(p, RSTP_LEARNING);
}
static void
enable_forwarding(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
/* [17.21.5 enableForwarding()] An implementation dependent procedure that
* causes the Forwarding Process (7.7) to start forwarding frames through
* the Port. The procedure does not complete until forwarding has been
* enabled.
*/
rstp_port_set_state__(p, RSTP_FORWARDING);
}
static void
disable_learning(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
/* [17.21.4 - disableLearning()] An implementation dependent procedure that
* causes the Learning Process (7.8) to stop learning from the source
* address of frames received on the Port. The procedure does not complete
* until learning has stopped.
*/
rstp_port_set_state__(p, RSTP_DISCARDING);
}
static void
disable_forwarding(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
/* [17.21.3 - disableForwarding()] An implementation dependent procedure
* that causes the Forwarding Process (7.7) to stop forwarding frames
* through the Port. The procedure does not complete until forwarding has
* stopped.
*/
rstp_port_set_state__(p, RSTP_DISCARDING);
}
static int
port_state_transition_sm(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
enum port_state_transition_state_machine old_state;
struct rstp *r;
old_state = p->port_state_transition_sm_state;
r = p->rstp;
switch (p->port_state_transition_sm_state) {
case PORT_STATE_TRANSITION_SM_INIT:
if (r->begin) {
p->port_state_transition_sm_state =
PORT_STATE_TRANSITION_SM_DISCARDING_EXEC;
}
break;
case PORT_STATE_TRANSITION_SM_DISCARDING_EXEC:
disable_learning(p);
p->learning = false;
disable_forwarding(p);
p->forwarding = false;
p->port_state_transition_sm_state =
PORT_STATE_TRANSITION_SM_DISCARDING;
/* fall through */
case PORT_STATE_TRANSITION_SM_DISCARDING:
if (p->learn) {
p->port_state_transition_sm_state =
PORT_STATE_TRANSITION_SM_LEARNING_EXEC;
}
break;
case PORT_STATE_TRANSITION_SM_LEARNING_EXEC:
enable_learning(p);
p->learning = true;
p->port_state_transition_sm_state = PORT_STATE_TRANSITION_SM_LEARNING;
/* fall through */
case PORT_STATE_TRANSITION_SM_LEARNING:
if (!p->learn) {
p->port_state_transition_sm_state =
PORT_STATE_TRANSITION_SM_DISCARDING_EXEC;
} else if (p->forward) {
p->port_state_transition_sm_state =
PORT_STATE_TRANSITION_SM_FORWARDING_EXEC;
}
break;
case PORT_STATE_TRANSITION_SM_FORWARDING_EXEC:
enable_forwarding(p);
p->forwarding = true;
p->port_state_transition_sm_state =
PORT_STATE_TRANSITION_SM_FORWARDING;
/* fall through */
case PORT_STATE_TRANSITION_SM_FORWARDING:
if (!p->forward) {
p->port_state_transition_sm_state =
PORT_STATE_TRANSITION_SM_DISCARDING_EXEC;
}
break;
default:
OVS_NOT_REACHED();
/* fall through */
}
if (old_state != p->port_state_transition_sm_state) {
r->changes = true;
VLOG_DBG("%s, port %u: Port_state_transition_sm %d -> %d",
p->rstp->name, p->port_number, old_state,
p->port_state_transition_sm_state);
}
return 0;
}
/* [17.31 - Topology Change state machine] */
static void
new_tc_while(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
struct rstp *r;
r = p->rstp;
if (p->tc_while == 0 && p->send_rstp == true) {
p->tc_while = r->bridge_hello_time + 1;
p->new_info = true;
} else if (p->tc_while == 0 && p->send_rstp == false) {
p->tc_while = r->bridge_max_age + r->bridge_forward_delay;
}
}
/* [17.21.18 setTcPropTree()]
* Sets tcprop for all Ports except the Port that called the procedure.
*/
static void
set_tc_prop_tree(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
struct rstp *r;
struct rstp_port *p1;
r = p->rstp;
HMAP_FOR_EACH (p1, node, &r->ports) {
/* Set tc_prop on every port, except the one calling this
* function. */
if (p1->port_number != p->port_number) {
p1->tc_prop = true;
}
}
}
static void
set_tc_prop_bridge(struct rstp_port *p) /* not specified in 802.1D-2004. */
OVS_REQUIRES(rstp_mutex)
{
set_tc_prop_tree(p); /* see 802.1w-2001. */
}
static int
topology_change_sm(struct rstp_port *p)
OVS_REQUIRES(rstp_mutex)
{
enum topology_change_state_machine old_state;
struct rstp *r;
old_state = p->topology_change_sm_state;
r = p->rstp;
switch (p->topology_change_sm_state) {
case TOPOLOGY_CHANGE_SM_INIT:
if (r->begin) {
p->topology_change_sm_state = TOPOLOGY_CHANGE_SM_INACTIVE_EXEC;
}
break;
case TOPOLOGY_CHANGE_SM_INACTIVE_EXEC:
p->fdb_flush = true;
p->tc_while = 0;
p->tc_ack = false;
p->topology_change_sm_state = TOPOLOGY_CHANGE_SM_INACTIVE;
/* fall through */
case TOPOLOGY_CHANGE_SM_INACTIVE:
if (p->learn && !p->fdb_flush) {
p->topology_change_sm_state = TOPOLOGY_CHANGE_SM_LEARNING_EXEC;
}
break;
case TOPOLOGY_CHANGE_SM_LEARNING_EXEC:
p->rcvd_tc = p->rcvd_tcn = p->rcvd_tc_ack = false;
p->tc_prop = p->rcvd_tc_ack = false;
p->topology_change_sm_state = TOPOLOGY_CHANGE_SM_LEARNING;
/* fall through */
case TOPOLOGY_CHANGE_SM_LEARNING:
if (p->role != ROLE_ROOT && p->role != ROLE_DESIGNATED &&
!(p->learn || p->learning) && !(p->rcvd_tc || p->rcvd_tcn ||
p->rcvd_tc_ack || p->tc_prop)) {
p->topology_change_sm_state = TOPOLOGY_CHANGE_SM_INACTIVE_EXEC;
} else if (p->rcvd_tc || p->rcvd_tcn || p->rcvd_tc_ack || p->tc_prop) {
p->topology_change_sm_state = TOPOLOGY_CHANGE_SM_LEARNING_EXEC;
} else if ((p->role == ROLE_ROOT || p->role == ROLE_DESIGNATED)
&& p->forward && !p->oper_edge) {
p->topology_change_sm_state = TOPOLOGY_CHANGE_SM_DETECTED_EXEC;
}
break;
case TOPOLOGY_CHANGE_SM_DETECTED_EXEC:
new_tc_while(p);
set_tc_prop_tree(p);
p->new_info = true;
p->topology_change_sm_state = TOPOLOGY_CHANGE_SM_ACTIVE_EXEC;
/* fall through */
case TOPOLOGY_CHANGE_SM_ACTIVE_EXEC:
p->topology_change_sm_state = TOPOLOGY_CHANGE_SM_ACTIVE;
/* fall through */
case TOPOLOGY_CHANGE_SM_ACTIVE:
if ((p->role != ROLE_ROOT && p->role != ROLE_DESIGNATED)
|| p->oper_edge) {
p->topology_change_sm_state = TOPOLOGY_CHANGE_SM_LEARNING_EXEC;
} else if (p->rcvd_tcn) {
p->topology_change_sm_state = TOPOLOGY_CHANGE_SM_NOTIFIED_TCN_EXEC;
} else if (p->rcvd_tc) {
p->topology_change_sm_state = TOPOLOGY_CHANGE_SM_NOTIFIED_TC_EXEC;
} else if (p->tc_prop && !p->oper_edge) {
p->topology_change_sm_state = TOPOLOGY_CHANGE_SM_PROPAGATING_EXEC;
} else if (p->rcvd_tc_ack) {
p->topology_change_sm_state = TOPOLOGY_CHANGE_SM_ACKNOWLEDGED_EXEC;
}
break;
case TOPOLOGY_CHANGE_SM_ACKNOWLEDGED_EXEC:
p->tc_while = 0;
p->rcvd_tc_ack = false;
p->topology_change_sm_state = TOPOLOGY_CHANGE_SM_ACTIVE;
break;
case TOPOLOGY_CHANGE_SM_PROPAGATING_EXEC:
new_tc_while(p);
p->fdb_flush = true;
p->tc_prop = false;
p->topology_change_sm_state = TOPOLOGY_CHANGE_SM_ACTIVE;
break;
case TOPOLOGY_CHANGE_SM_NOTIFIED_TC_EXEC:
p->rcvd_tcn = p->rcvd_tc = false;
if (p->role == ROLE_DESIGNATED) {
p->tc_ack = true;
}
set_tc_prop_bridge(p);
p->topology_change_sm_state = TOPOLOGY_CHANGE_SM_ACTIVE;
break;
case TOPOLOGY_CHANGE_SM_NOTIFIED_TCN_EXEC:
new_tc_while(p);
p->topology_change_sm_state = TOPOLOGY_CHANGE_SM_NOTIFIED_TC_EXEC;
break;
default:
OVS_NOT_REACHED();
/* fall through */
}
if (old_state != p->topology_change_sm_state) {
r->changes = true;
VLOG_DBG("%s, port %u: Topology_change_sm %d -> %d", p->rstp->name,
p->port_number, old_state, p->topology_change_sm_state);
}
return 0;
}
/****************************************************************************
* [17.6] Priority vector calculation helper functions
****************************************************************************/
/* compare_rstp_priority_vectors() compares two struct rstp_priority_vectors
* and returns a value indicating if the first rstp_priority_vector is
* superior, same or inferior to the second one.
*
* Zero return value indicates INFERIOR, a non-zero return value indicates
* SUPERIOR. When it makes a difference the non-zero return value SAME
* indicates the priority vectors are identical (a subset of SUPERIOR).
*/
static enum vector_comparison
compare_rstp_priority_vectors(const struct rstp_priority_vector *v1,
const struct rstp_priority_vector *v2)
{
VLOG_DBG("v1: "RSTP_ID_FMT", %u, "RSTP_ID_FMT", %d, %d",
RSTP_ID_ARGS(v1->root_bridge_id), v1->root_path_cost,
RSTP_ID_ARGS(v1->designated_bridge_id), v1->designated_port_id,
v1->bridge_port_id);
VLOG_DBG("v2: "RSTP_ID_FMT", %u, "RSTP_ID_FMT", %d, %d",
RSTP_ID_ARGS(v2->root_bridge_id), v2->root_path_cost,
RSTP_ID_ARGS(v2->designated_bridge_id), v2->designated_port_id,
v2->bridge_port_id);
/* [17.6]
* This message priority vector is superior to the port priority vector and
* will replace it if, and only if, the message priority vector is better
* than the port priority vector, or the message has been transmitted from
* the same Designated Bridge and Designated Port as the port priority
* vector, i.e., if the following is true:
*
* ((RD < RootBridgeID)) ||
* ((RD == RootBridgeID) && (RPCD < RootPathCost)) ||
* ((RD == RootBridgeID) && (RPCD == RootPathCost) &&
* (D < designated_bridge_id)) ||
* ((RD == RootBridgeID) && (RPCD == RootPathCost) &&
* (D == designated_bridge_id) && (PD < designated_port_id)) ||
* ((D == designated_bridge_id.BridgeAddress) &&
* (PD == designated_port_id.PortNumber))
*/
if ((v1->root_bridge_id < v2->root_bridge_id)
|| (v1->root_bridge_id == v2->root_bridge_id
&& v1->root_path_cost < v2->root_path_cost)
|| (v1->root_bridge_id == v2->root_bridge_id
&& v1->root_path_cost == v2->root_path_cost
&& v1->designated_bridge_id < v2->designated_bridge_id)
|| (v1->root_bridge_id == v2->root_bridge_id
&& v1->root_path_cost == v2->root_path_cost
&& v1->designated_bridge_id == v2->designated_bridge_id
&& v1->designated_port_id < v2->designated_port_id)
|| (v1->designated_bridge_id == v2->designated_bridge_id
&& v1->designated_port_id == v2->designated_port_id)) {
/* SAME is a subset of SUPERIOR. */
if (v1->root_bridge_id == v2->root_bridge_id
&& v1->root_path_cost == v2->root_path_cost
&& v1->designated_bridge_id == v2->designated_bridge_id
&& v1->designated_port_id == v2->designated_port_id) {
if (v1->bridge_port_id < v2->bridge_port_id) {
VLOG_DBG("superior");
return SUPERIOR;
}
else if (v1->bridge_port_id > v2->bridge_port_id) {
VLOG_DBG("inferior");
return INFERIOR;
}
VLOG_DBG("superior_same");
return SAME;
}
VLOG_DBG("superior");
return SUPERIOR;
}
VLOG_DBG("inferior");
return INFERIOR;
}
static bool
rstp_times_equal(struct rstp_times *t1, struct rstp_times *t2)
{
return t1->forward_delay == t2->forward_delay
&& t1->hello_time == t2->hello_time
&& t1->max_age == t2->max_age
&& t1->message_age == t2->message_age;
}
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