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/*
* net/tipc/bcast.c: TIPC broadcast code
*
* Copyright (c) 2004-2006, Ericsson AB
* Copyright (c) 2004, Intel Corporation.
* Copyright (c) 2005, 2010-2011, Wind River Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the names of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#include "core.h"
#include "link.h"
#include "port.h"
#include "bcast.h"
#include "name_distr.h"

#define MAX_PKT_DEFAULT_MCAST 1500 /* bcast link max packet size (fixed) */

#define BCLINK_WIN_DEFAULT 20 /* bcast link window size (default) */

/**
* struct bcbearer_pair - a pair of bearers used by broadcast link
* @primary: pointer to primary bearer
* @secondary: pointer to secondary bearer
*
* Bearers must have same priority and same set of reachable destinations
* to be paired.
*/

struct bcbearer_pair {
struct tipc_bearer *primary;
struct tipc_bearer *secondary;
};

/**
* struct bcbearer - bearer used by broadcast link
* @bearer: (non-standard) broadcast bearer structure
* @media: (non-standard) broadcast media structure
* @bpairs: array of bearer pairs
* @bpairs_temp: temporary array of bearer pairs used by tipc_bcbearer_sort()
* @remains: temporary node map used by tipc_bcbearer_send()
* @remains_new: temporary node map used tipc_bcbearer_send()
*
* Note: The fields labelled "temporary" are incorporated into the bearer
* to avoid consuming potentially limited stack space through the use of
* large local variables within multicast routines. Concurrent access is
* prevented through use of the spinlock "bc_lock".
*/

struct bcbearer {
struct tipc_bearer bearer;
struct media media;
struct bcbearer_pair bpairs[MAX_BEARERS];
struct bcbearer_pair bpairs_temp[TIPC_MAX_LINK_PRI + 1];
struct tipc_node_map remains;
struct tipc_node_map remains_new;
};

/**
* struct bclink - link used for broadcast messages
* @link: (non-standard) broadcast link structure
* @node: (non-standard) node structure representing b'cast link's peer node
* @retransmit_to: node that most recently requested a retransmit
*
* Handles sequence numbering, fragmentation, bundling, etc.
*/

struct bclink {
struct link link;
struct tipc_node node;
struct tipc_node *retransmit_to;
};


static struct bcbearer *bcbearer;
static struct bclink *bclink;
static struct link *bcl;
static DEFINE_SPINLOCK(bc_lock);

/* broadcast-capable node map */
struct tipc_node_map tipc_bcast_nmap;

const char tipc_bclink_name[] = "broadcast-link";

static void tipc_nmap_diff(struct tipc_node_map *nm_a,
struct tipc_node_map *nm_b,
struct tipc_node_map *nm_diff);

static u32 buf_seqno(struct sk_buff *buf)
{
return msg_seqno(buf_msg(buf));
}

static u32 bcbuf_acks(struct sk_buff *buf)
{
return (u32)(unsigned long)TIPC_SKB_CB(buf)->handle;
}

static void bcbuf_set_acks(struct sk_buff *buf, u32 acks)
{
TIPC_SKB_CB(buf)->handle = (void *)(unsigned long)acks;
}

static void bcbuf_decr_acks(struct sk_buff *buf)
{
bcbuf_set_acks(buf, bcbuf_acks(buf) - 1);
}


static void bclink_set_last_sent(void)
{
if (bcl->next_out)
bcl->fsm_msg_cnt = mod(buf_seqno(bcl->next_out) - 1);
else
bcl->fsm_msg_cnt = mod(bcl->next_out_no - 1);
}

u32 tipc_bclink_get_last_sent(void)
{
return bcl->fsm_msg_cnt;
}

/**
* bclink_set_gap - set gap according to contents of current deferred pkt queue
*
* Called with 'node' locked, bc_lock unlocked
*/

static void bclink_set_gap(struct tipc_node *n_ptr)
{
struct sk_buff *buf = n_ptr->bclink.deferred_head;

n_ptr->bclink.gap_after = n_ptr->bclink.gap_to =
mod(n_ptr->bclink.last_in);
if (unlikely(buf != NULL))
n_ptr->bclink.gap_to = mod(buf_seqno(buf) - 1);
}

/**
* bclink_ack_allowed - test if ACK or NACK message can be sent at this moment
*
* This mechanism endeavours to prevent all nodes in network from trying
* to ACK or NACK at the same time.
*
* Note: TIPC uses a different trigger to distribute ACKs than it does to
* distribute NACKs, but tries to use the same spacing (divide by 16).
*/

static int bclink_ack_allowed(u32 n)
{
return (n % TIPC_MIN_LINK_WIN) == tipc_own_tag;
}


/**
* tipc_bclink_retransmit_to - get most recent node to request retransmission
*
* Called with bc_lock locked
*/

struct tipc_node *tipc_bclink_retransmit_to(void)
{
return bclink->retransmit_to;
}

/**
* bclink_retransmit_pkt - retransmit broadcast packets
* @after: sequence number of last packet to *not* retransmit
* @to: sequence number of last packet to retransmit
*
* Called with bc_lock locked
*/

static void bclink_retransmit_pkt(u32 after, u32 to)
{
struct sk_buff *buf;

buf = bcl->first_out;
while (buf && less_eq(buf_seqno(buf), after))
buf = buf->next;
tipc_link_retransmit(bcl, buf, mod(to - after));
}

/**
* tipc_bclink_acknowledge - handle acknowledgement of broadcast packets
* @n_ptr: node that sent acknowledgement info
* @acked: broadcast sequence # that has been acknowledged
*
* Node is locked, bc_lock unlocked.
*/

void tipc_bclink_acknowledge(struct tipc_node *n_ptr, u32 acked)
{
struct sk_buff *crs;
struct sk_buff *next;
unsigned int released = 0;

if (less_eq(acked, n_ptr->bclink.acked))
return;

spin_lock_bh(&bc_lock);

/* Skip over packets that node has previously acknowledged */

crs = bcl->first_out;
while (crs && less_eq(buf_seqno(crs), n_ptr->bclink.acked))
crs = crs->next;

/* Update packets that node is now acknowledging */

while (crs && less_eq(buf_seqno(crs), acked)) {
next = crs->next;
bcbuf_decr_acks(crs);
if (bcbuf_acks(crs) == 0) {
bcl->first_out = next;
bcl->out_queue_size--;
buf_discard(crs);
released = 1;
}
crs = next;
}
n_ptr->bclink.acked = acked;

/* Try resolving broadcast link congestion, if necessary */

if (unlikely(bcl->next_out)) {
tipc_link_push_queue(bcl);
bclink_set_last_sent();
}
if (unlikely(released && !list_empty(&bcl->waiting_ports)))
tipc_link_wakeup_ports(bcl, 0);
spin_unlock_bh(&bc_lock);
}

/**
* bclink_send_ack - unicast an ACK msg
*
* tipc_net_lock and node lock set
*/

static void bclink_send_ack(struct tipc_node *n_ptr)
{
struct link *l_ptr = n_ptr->active_links[n_ptr->addr & 1];

if (l_ptr != NULL)
tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
}

/**
* bclink_send_nack- broadcast a NACK msg
*
* tipc_net_lock and node lock set
*/

static void bclink_send_nack(struct tipc_node *n_ptr)
{
struct sk_buff *buf;
struct tipc_msg *msg;

if (!less(n_ptr->bclink.gap_after, n_ptr->bclink.gap_to))
return;

buf = tipc_buf_acquire(INT_H_SIZE);
if (buf) {
msg = buf_msg(buf);
tipc_msg_init(msg, BCAST_PROTOCOL, STATE_MSG,
INT_H_SIZE, n_ptr->addr);
msg_set_non_seq(msg, 1);
msg_set_mc_netid(msg, tipc_net_id);
msg_set_bcast_ack(msg, mod(n_ptr->bclink.last_in));
msg_set_bcgap_after(msg, n_ptr->bclink.gap_after);
msg_set_bcgap_to(msg, n_ptr->bclink.gap_to);
msg_set_bcast_tag(msg, tipc_own_tag);

tipc_bearer_send(&bcbearer->bearer, buf, NULL);
bcl->stats.sent_nacks++;
buf_discard(buf);

/*
* Ensure we doesn't send another NACK msg to the node
* until 16 more deferred messages arrive from it
* (i.e. helps prevent all nodes from NACK'ing at same time)
*/

n_ptr->bclink.nack_sync = tipc_own_tag;
}
}

/**
* tipc_bclink_check_gap - send a NACK if a sequence gap exists
*
* tipc_net_lock and node lock set
*/

void tipc_bclink_check_gap(struct tipc_node *n_ptr, u32 last_sent)
{
if (!n_ptr->bclink.supported ||
less_eq(last_sent, mod(n_ptr->bclink.last_in)))
return;

bclink_set_gap(n_ptr);
if (n_ptr->bclink.gap_after == n_ptr->bclink.gap_to)
n_ptr->bclink.gap_to = last_sent;
bclink_send_nack(n_ptr);
}

/**
* tipc_bclink_peek_nack - process a NACK msg meant for another node
*
* Only tipc_net_lock set.
*/

static void tipc_bclink_peek_nack(u32 dest, u32 sender_tag, u32 gap_after, u32 gap_to)
{
struct tipc_node *n_ptr = tipc_node_find(dest);
u32 my_after, my_to;

if (unlikely(!n_ptr || !tipc_node_is_up(n_ptr)))
return;
tipc_node_lock(n_ptr);
/*
* Modify gap to suppress unnecessary NACKs from this node
*/
my_after = n_ptr->bclink.gap_after;
my_to = n_ptr->bclink.gap_to;

if (less_eq(gap_after, my_after)) {
if (less(my_after, gap_to) && less(gap_to, my_to))
n_ptr->bclink.gap_after = gap_to;
else if (less_eq(my_to, gap_to))
n_ptr->bclink.gap_to = n_ptr->bclink.gap_after;
} else if (less_eq(gap_after, my_to)) {
if (less_eq(my_to, gap_to))
n_ptr->bclink.gap_to = gap_after;
} else {
/*
* Expand gap if missing bufs not in deferred queue:
*/
struct sk_buff *buf = n_ptr->bclink.deferred_head;
u32 prev = n_ptr->bclink.gap_to;

for (; buf; buf = buf->next) {
u32 seqno = buf_seqno(buf);

if (mod(seqno - prev) != 1) {
buf = NULL;
break;
}
if (seqno == gap_after)
break;
prev = seqno;
}
if (buf == NULL)
n_ptr->bclink.gap_to = gap_after;
}
/*
* Some nodes may send a complementary NACK now:
*/
if (bclink_ack_allowed(sender_tag + 1)) {
if (n_ptr->bclink.gap_to != n_ptr->bclink.gap_after) {
bclink_send_nack(n_ptr);
bclink_set_gap(n_ptr);
}
}
tipc_node_unlock(n_ptr);
}

/**
* tipc_bclink_send_msg - broadcast a packet to all nodes in cluster
*/

int tipc_bclink_send_msg(struct sk_buff *buf)
{
int res;

spin_lock_bh(&bc_lock);

res = tipc_link_send_buf(bcl, buf);
if (likely(res > 0))
bclink_set_last_sent();

bcl->stats.queue_sz_counts++;
bcl->stats.accu_queue_sz += bcl->out_queue_size;

spin_unlock_bh(&bc_lock);
return res;
}

/**
* tipc_bclink_recv_pkt - receive a broadcast packet, and deliver upwards
*
* tipc_net_lock is read_locked, no other locks set
*/

void tipc_bclink_recv_pkt(struct sk_buff *buf)
{
struct tipc_msg *msg = buf_msg(buf);
struct tipc_node *node;
u32 next_in;
u32 seqno;
struct sk_buff *deferred;

/* Screen out unwanted broadcast messages */

if (msg_mc_netid(msg) != tipc_net_id)
goto exit;

node = tipc_node_find(msg_prevnode(msg));
if (unlikely(!node))
goto exit;

tipc_node_lock(node);
if (unlikely(!node->bclink.supported))
goto unlock;

if (unlikely(msg_user(msg) == BCAST_PROTOCOL)) {
if (msg_type(msg) != STATE_MSG)
goto unlock;
if (msg_destnode(msg) == tipc_own_addr) {
tipc_bclink_acknowledge(node, msg_bcast_ack(msg));
tipc_node_unlock(node);
spin_lock_bh(&bc_lock);
bcl->stats.recv_nacks++;
bclink->retransmit_to = node;
bclink_retransmit_pkt(msg_bcgap_after(msg),
msg_bcgap_to(msg));
spin_unlock_bh(&bc_lock);
} else {
tipc_node_unlock(node);
tipc_bclink_peek_nack(msg_destnode(msg),
msg_bcast_tag(msg),
msg_bcgap_after(msg),
msg_bcgap_to(msg));
}
goto exit;
}

/* Handle in-sequence broadcast message */

receive:
next_in = mod(node->bclink.last_in + 1);
seqno = msg_seqno(msg);

if (likely(seqno == next_in)) {
bcl->stats.recv_info++;
node->bclink.last_in++;
bclink_set_gap(node);
if (unlikely(bclink_ack_allowed(seqno))) {
bclink_send_ack(node);
bcl->stats.sent_acks++;
}
if (likely(msg_isdata(msg))) {
tipc_node_unlock(node);
if (likely(msg_mcast(msg)))
tipc_port_recv_mcast(buf, NULL);
else
buf_discard(buf);
} else if (msg_user(msg) == MSG_BUNDLER) {
bcl->stats.recv_bundles++;
bcl->stats.recv_bundled += msg_msgcnt(msg);
tipc_node_unlock(node);
tipc_link_recv_bundle(buf);
} else if (msg_user(msg) == MSG_FRAGMENTER) {
bcl->stats.recv_fragments++;
if (tipc_link_recv_fragment(&node->bclink.defragm,
&buf, &msg))
bcl->stats.recv_fragmented++;
tipc_node_unlock(node);
tipc_net_route_msg(buf);
} else if (msg_user(msg) == NAME_DISTRIBUTOR) {
tipc_node_unlock(node);
tipc_named_recv(buf);
} else {
tipc_node_unlock(node);
buf_discard(buf);
}
buf = NULL;
tipc_node_lock(node);
deferred = node->bclink.deferred_head;
if (deferred && (buf_seqno(deferred) == mod(next_in + 1))) {
buf = deferred;
msg = buf_msg(buf);
node->bclink.deferred_head = deferred->next;
goto receive;
}
} else if (less(next_in, seqno)) {
u32 gap_after = node->bclink.gap_after;
u32 gap_to = node->bclink.gap_to;

if (tipc_link_defer_pkt(&node->bclink.deferred_head,
&node->bclink.deferred_tail,
buf)) {
node->bclink.nack_sync++;
bcl->stats.deferred_recv++;
if (seqno == mod(gap_after + 1))
node->bclink.gap_after = seqno;
else if (less(gap_after, seqno) && less(seqno, gap_to))
node->bclink.gap_to = seqno;
}
buf = NULL;
if (bclink_ack_allowed(node->bclink.nack_sync)) {
if (gap_to != gap_after)
bclink_send_nack(node);
bclink_set_gap(node);
}
} else {
bcl->stats.duplicates++;
}
unlock:
tipc_node_unlock(node);
exit:
buf_discard(buf);
}

u32 tipc_bclink_acks_missing(struct tipc_node *n_ptr)
{
return (n_ptr->bclink.supported &&
(tipc_bclink_get_last_sent() != n_ptr->bclink.acked));
}


/**
* tipc_bcbearer_send - send a packet through the broadcast pseudo-bearer
*
* Send packet over as many bearers as necessary to reach all nodes
* that have joined the broadcast link.
*
* Returns 0 (packet sent successfully) under all circumstances,
* since the broadcast link's pseudo-bearer never blocks
*/

static int tipc_bcbearer_send(struct sk_buff *buf,
struct tipc_bearer *unused1,
struct tipc_media_addr *unused2)
{
int bp_index;

/*
* Prepare broadcast link message for reliable transmission,
* if first time trying to send it;
* preparation is skipped for broadcast link protocol messages
* since they are sent in an unreliable manner and don't need it
*/

if (likely(!msg_non_seq(buf_msg(buf)))) {
struct tipc_msg *msg;

bcbuf_set_acks(buf, tipc_bcast_nmap.count);
msg = buf_msg(buf);
msg_set_non_seq(msg, 1);
msg_set_mc_netid(msg, tipc_net_id);
bcl->stats.sent_info++;

if (WARN_ON(!tipc_bcast_nmap.count)) {
dump_stack();
return 0;
}
}

/* Send buffer over bearers until all targets reached */

bcbearer->remains = tipc_bcast_nmap;

for (bp_index = 0; bp_index < MAX_BEARERS; bp_index++) {
struct tipc_bearer *p = bcbearer->bpairs[bp_index].primary;
struct tipc_bearer *s = bcbearer->bpairs[bp_index].secondary;

if (!p)
break; /* no more bearers to try */

tipc_nmap_diff(&bcbearer->remains, &p->nodes, &bcbearer->remains_new);
if (bcbearer->remains_new.count == bcbearer->remains.count)
continue; /* bearer pair doesn't add anything */

if (p->blocked ||
p->media->send_msg(buf, p, &p->media->bcast_addr)) {
/* unable to send on primary bearer */
if (!s || s->blocked ||
s->media->send_msg(buf, s,
&s->media->bcast_addr)) {
/* unable to send on either bearer */
continue;
}
}

if (s) {
bcbearer->bpairs[bp_index].primary = s;
bcbearer->bpairs[bp_index].secondary = p;
}

if (bcbearer->remains_new.count == 0)
break; /* all targets reached */

bcbearer->remains = bcbearer->remains_new;
}

return 0;
}

/**
* tipc_bcbearer_sort - create sets of bearer pairs used by broadcast bearer
*/

void tipc_bcbearer_sort(void)
{
struct bcbearer_pair *bp_temp = bcbearer->bpairs_temp;
struct bcbearer_pair *bp_curr;
int b_index;
int pri;

spin_lock_bh(&bc_lock);

/* Group bearers by priority (can assume max of two per priority) */

memset(bp_temp, 0, sizeof(bcbearer->bpairs_temp));

for (b_index = 0; b_index < MAX_BEARERS; b_index++) {
struct tipc_bearer *b = &tipc_bearers[b_index];

if (!b->active || !b->nodes.count)
continue;

if (!bp_temp[b->priority].primary)
bp_temp[b->priority].primary = b;
else
bp_temp[b->priority].secondary = b;
}

/* Create array of bearer pairs for broadcasting */

bp_curr = bcbearer->bpairs;
memset(bcbearer->bpairs, 0, sizeof(bcbearer->bpairs));

for (pri = TIPC_MAX_LINK_PRI; pri >= 0; pri--) {

if (!bp_temp[pri].primary)
continue;

bp_curr->primary = bp_temp[pri].primary;

if (bp_temp[pri].secondary) {
if (tipc_nmap_equal(&bp_temp[pri].primary->nodes,
&bp_temp[pri].secondary->nodes)) {
bp_curr->secondary = bp_temp[pri].secondary;
} else {
bp_curr++;
bp_curr->primary = bp_temp[pri].secondary;
}
}

bp_curr++;
}

spin_unlock_bh(&bc_lock);
}


int tipc_bclink_stats(char *buf, const u32 buf_size)
{
struct print_buf pb;

if (!bcl)
return 0;

tipc_printbuf_init(&pb, buf, buf_size);

spin_lock_bh(&bc_lock);

tipc_printf(&pb, "Link <%s>\n"
" Window:%u packets\n",
bcl->name, bcl->queue_limit[0]);
tipc_printf(&pb, " RX packets:%u fragments:%u/%u bundles:%u/%u\n",
bcl->stats.recv_info,
bcl->stats.recv_fragments,
bcl->stats.recv_fragmented,
bcl->stats.recv_bundles,
bcl->stats.recv_bundled);
tipc_printf(&pb, " TX packets:%u fragments:%u/%u bundles:%u/%u\n",
bcl->stats.sent_info,
bcl->stats.sent_fragments,
bcl->stats.sent_fragmented,
bcl->stats.sent_bundles,
bcl->stats.sent_bundled);
tipc_printf(&pb, " RX naks:%u defs:%u dups:%u\n",
bcl->stats.recv_nacks,
bcl->stats.deferred_recv,
bcl->stats.duplicates);
tipc_printf(&pb, " TX naks:%u acks:%u dups:%u\n",
bcl->stats.sent_nacks,
bcl->stats.sent_acks,
bcl->stats.retransmitted);
tipc_printf(&pb, " Congestion bearer:%u link:%u Send queue max:%u avg:%u\n",
bcl->stats.bearer_congs,
bcl->stats.link_congs,
bcl->stats.max_queue_sz,
bcl->stats.queue_sz_counts
? (bcl->stats.accu_queue_sz / bcl->stats.queue_sz_counts)
: 0);

spin_unlock_bh(&bc_lock);
return tipc_printbuf_validate(&pb);
}

int tipc_bclink_reset_stats(void)
{
if (!bcl)
return -ENOPROTOOPT;

spin_lock_bh(&bc_lock);
memset(&bcl->stats, 0, sizeof(bcl->stats));
spin_unlock_bh(&bc_lock);
return 0;
}

int tipc_bclink_set_queue_limits(u32 limit)
{
if (!bcl)
return -ENOPROTOOPT;
if ((limit < TIPC_MIN_LINK_WIN) || (limit > TIPC_MAX_LINK_WIN))
return -EINVAL;

spin_lock_bh(&bc_lock);
tipc_link_set_queue_limits(bcl, limit);
spin_unlock_bh(&bc_lock);
return 0;
}

int tipc_bclink_init(void)
{
bcbearer = kzalloc(sizeof(*bcbearer), GFP_ATOMIC);
bclink = kzalloc(sizeof(*bclink), GFP_ATOMIC);
if (!bcbearer || !bclink) {
warn("Broadcast link creation failed, no memory\n");
kfree(bcbearer);
bcbearer = NULL;
kfree(bclink);
bclink = NULL;
return -ENOMEM;
}

INIT_LIST_HEAD(&bcbearer->bearer.cong_links);
bcbearer->bearer.media = &bcbearer->media;
bcbearer->media.send_msg = tipc_bcbearer_send;
sprintf(bcbearer->media.name, "tipc-broadcast");

bcl = &bclink->link;
INIT_LIST_HEAD(&bcl->waiting_ports);
bcl->next_out_no = 1;
spin_lock_init(&bclink->node.lock);
bcl->owner = &bclink->node;
bcl->max_pkt = MAX_PKT_DEFAULT_MCAST;
tipc_link_set_queue_limits(bcl, BCLINK_WIN_DEFAULT);
bcl->b_ptr = &bcbearer->bearer;
bcl->state = WORKING_WORKING;
strlcpy(bcl->name, tipc_bclink_name, TIPC_MAX_LINK_NAME);

return 0;
}

void tipc_bclink_stop(void)
{
spin_lock_bh(&bc_lock);
if (bcbearer) {
tipc_link_stop(bcl);
bcl = NULL;
kfree(bclink);
bclink = NULL;
kfree(bcbearer);
bcbearer = NULL;
}
spin_unlock_bh(&bc_lock);
}


/**
* tipc_nmap_add - add a node to a node map
*/

void tipc_nmap_add(struct tipc_node_map *nm_ptr, u32 node)
{
int n = tipc_node(node);
int w = n / WSIZE;
u32 mask = (1 << (n % WSIZE));

if ((nm_ptr->map[w] & mask) == 0) {
nm_ptr->count++;
nm_ptr->map[w] |= mask;
}
}

/**
* tipc_nmap_remove - remove a node from a node map
*/

void tipc_nmap_remove(struct tipc_node_map *nm_ptr, u32 node)
{
int n = tipc_node(node);
int w = n / WSIZE;
u32 mask = (1 << (n % WSIZE));

if ((nm_ptr->map[w] & mask) != 0) {
nm_ptr->map[w] &= ~mask;
nm_ptr->count--;
}
}

/**
* tipc_nmap_diff - find differences between node maps
* @nm_a: input node map A
* @nm_b: input node map B
* @nm_diff: output node map A-B (i.e. nodes of A that are not in B)
*/

static void tipc_nmap_diff(struct tipc_node_map *nm_a,
struct tipc_node_map *nm_b,
struct tipc_node_map *nm_diff)
{
int stop = ARRAY_SIZE(nm_a->map);
int w;
int b;
u32 map;

memset(nm_diff, 0, sizeof(*nm_diff));
for (w = 0; w < stop; w++) {
map = nm_a->map[w] ^ (nm_a->map[w] & nm_b->map[w]);
nm_diff->map[w] = map;
if (map != 0) {
for (b = 0 ; b < WSIZE; b++) {
if (map & (1 << b))
nm_diff->count++;
}
}
}
}

/**
* tipc_port_list_add - add a port to a port list, ensuring no duplicates
*/

void tipc_port_list_add(struct port_list *pl_ptr, u32 port)
{
struct port_list *item = pl_ptr;
int i;
int item_sz = PLSIZE;
int cnt = pl_ptr->count;

for (; ; cnt -= item_sz, item = item->next) {
if (cnt < PLSIZE)
item_sz = cnt;
for (i = 0; i < item_sz; i++)
if (item->ports[i] == port)
return;
if (i < PLSIZE) {
item->ports[i] = port;
pl_ptr->count++;
return;
}
if (!item->next) {
item->next = kmalloc(sizeof(*item), GFP_ATOMIC);
if (!item->next) {
warn("Incomplete multicast delivery, no memory\n");
return;
}
item->next->next = NULL;
}
}
}

/**
* tipc_port_list_free - free dynamically created entries in port_list chain
*
*/

void tipc_port_list_free(struct port_list *pl_ptr)
{
struct port_list *item;
struct port_list *next;

for (item = pl_ptr->next; item; item = next) {
next = item->next;
kfree(item);
}
}
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