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linux/net/tipc/name_table.c

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/*
* net/tipc/name_table.c: TIPC name table code
*
* Copyright (c) 2000-2006, Ericsson AB
* Copyright (c) 2004-2005, 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 "config.h"
#include "dbg.h"
#include "name_table.h"
#include "name_distr.h"
#include "addr.h"
#include "node_subscr.h"
#include "subscr.h"
#include "port.h"
#include "cluster.h"
#include "bcast.h"
static int tipc_nametbl_size = 1024; /* must be a power of 2 */
/**
* struct sub_seq - container for all published instances of a name sequence
* @lower: name sequence lower bound
* @upper: name sequence upper bound
* @node_list: circular list of matching publications with >= node scope
* @cluster_list: circular list of matching publications with >= cluster scope
* @zone_list: circular list of matching publications with >= zone scope
*/
struct sub_seq {
u32 lower;
u32 upper;
struct publication *node_list;
struct publication *cluster_list;
struct publication *zone_list;
};
/**
* struct name_seq - container for all published instances of a name type
* @type: 32 bit 'type' value for name sequence
* @sseq: pointer to dynamically-sized array of sub-sequences of this 'type';
* sub-sequences are sorted in ascending order
* @alloc: number of sub-sequences currently in array
* @first_free: array index of first unused sub-sequence entry
* @ns_list: links to adjacent name sequences in hash chain
* @subscriptions: list of subscriptions for this 'type'
* @lock: spinlock controlling access to name sequence structure
*/
struct name_seq {
u32 type;
struct sub_seq *sseqs;
u32 alloc;
u32 first_free;
struct hlist_node ns_list;
struct list_head subscriptions;
spinlock_t lock;
};
/**
* struct name_table - table containing all existing port name publications
* @types: pointer to fixed-sized array of name sequence lists,
* accessed via hashing on 'type'; name sequence lists are *not* sorted
* @local_publ_count: number of publications issued by this node
*/
struct name_table {
struct hlist_head *types;
u32 local_publ_count;
};
static struct name_table table = { NULL } ;
static atomic_t rsv_publ_ok = ATOMIC_INIT(0);
DEFINE_RWLOCK(tipc_nametbl_lock);
static int hash(int x)
{
return(x & (tipc_nametbl_size - 1));
}
/**
* publ_create - create a publication structure
*/
static struct publication *publ_create(u32 type, u32 lower, u32 upper,
u32 scope, u32 node, u32 port_ref,
u32 key)
{
struct publication *publ = kzalloc(sizeof(*publ), GFP_ATOMIC);
if (publ == NULL) {
warn("Publication creation failure, no memory\n");
return NULL;
}
publ->type = type;
publ->lower = lower;
publ->upper = upper;
publ->scope = scope;
publ->node = node;
publ->ref = port_ref;
publ->key = key;
INIT_LIST_HEAD(&publ->local_list);
INIT_LIST_HEAD(&publ->pport_list);
INIT_LIST_HEAD(&publ->subscr.nodesub_list);
return publ;
}
/**
* tipc_subseq_alloc - allocate a specified number of sub-sequence structures
*/
static struct sub_seq *tipc_subseq_alloc(u32 cnt)
{
struct sub_seq *sseq = kcalloc(cnt, sizeof(struct sub_seq), GFP_ATOMIC);
return sseq;
}
/**
* tipc_nameseq_create - create a name sequence structure for the specified 'type'
*
* Allocates a single sub-sequence structure and sets it to all 0's.
*/
static struct name_seq *tipc_nameseq_create(u32 type, struct hlist_head *seq_head)
{
struct name_seq *nseq = kzalloc(sizeof(*nseq), GFP_ATOMIC);
struct sub_seq *sseq = tipc_subseq_alloc(1);
if (!nseq || !sseq) {
warn("Name sequence creation failed, no memory\n");
kfree(nseq);
kfree(sseq);
return NULL;
}
spin_lock_init(&nseq->lock);
nseq->type = type;
nseq->sseqs = sseq;
dbg("tipc_nameseq_create(): nseq = %p, type %u, ssseqs %p, ff: %u\n",
nseq, type, nseq->sseqs, nseq->first_free);
nseq->alloc = 1;
INIT_HLIST_NODE(&nseq->ns_list);
INIT_LIST_HEAD(&nseq->subscriptions);
hlist_add_head(&nseq->ns_list, seq_head);
return nseq;
}
/**
* nameseq_find_subseq - find sub-sequence (if any) matching a name instance
*
* Very time-critical, so binary searches through sub-sequence array.
*/
static struct sub_seq *nameseq_find_subseq(struct name_seq *nseq,
u32 instance)
{
struct sub_seq *sseqs = nseq->sseqs;
int low = 0;
int high = nseq->first_free - 1;
int mid;
while (low <= high) {
mid = (low + high) / 2;
if (instance < sseqs[mid].lower)
high = mid - 1;
else if (instance > sseqs[mid].upper)
low = mid + 1;
else
return &sseqs[mid];
}
return NULL;
}
/**
* nameseq_locate_subseq - determine position of name instance in sub-sequence
*
* Returns index in sub-sequence array of the entry that contains the specified
* instance value; if no entry contains that value, returns the position
* where a new entry for it would be inserted in the array.
*
* Note: Similar to binary search code for locating a sub-sequence.
*/
static u32 nameseq_locate_subseq(struct name_seq *nseq, u32 instance)
{
struct sub_seq *sseqs = nseq->sseqs;
int low = 0;
int high = nseq->first_free - 1;
int mid;
while (low <= high) {
mid = (low + high) / 2;
if (instance < sseqs[mid].lower)
high = mid - 1;
else if (instance > sseqs[mid].upper)
low = mid + 1;
else
return mid;
}
return low;
}
/**
* tipc_nameseq_insert_publ -
*/
static struct publication *tipc_nameseq_insert_publ(struct name_seq *nseq,
u32 type, u32 lower, u32 upper,
u32 scope, u32 node, u32 port, u32 key)
{
struct subscription *s;
struct subscription *st;
struct publication *publ;
struct sub_seq *sseq;
int created_subseq = 0;
sseq = nameseq_find_subseq(nseq, lower);
dbg("nameseq_ins: for seq %p, {%u,%u}, found sseq %p\n",
nseq, type, lower, sseq);
if (sseq) {
/* Lower end overlaps existing entry => need an exact match */
if ((sseq->lower != lower) || (sseq->upper != upper)) {
warn("Cannot publish {%u,%u,%u}, overlap error\n",
type, lower, upper);
return NULL;
}
} else {
u32 inspos;
struct sub_seq *freesseq;
/* Find where lower end should be inserted */
inspos = nameseq_locate_subseq(nseq, lower);
/* Fail if upper end overlaps into an existing entry */
if ((inspos < nseq->first_free) &&
(upper >= nseq->sseqs[inspos].lower)) {
warn("Cannot publish {%u,%u,%u}, overlap error\n",
type, lower, upper);
return NULL;
}
/* Ensure there is space for new sub-sequence */
if (nseq->first_free == nseq->alloc) {
struct sub_seq *sseqs = tipc_subseq_alloc(nseq->alloc * 2);
if (!sseqs) {
warn("Cannot publish {%u,%u,%u}, no memory\n",
type, lower, upper);
return NULL;
}
dbg("Allocated %u more sseqs\n", nseq->alloc);
memcpy(sseqs, nseq->sseqs,
nseq->alloc * sizeof(struct sub_seq));
kfree(nseq->sseqs);
nseq->sseqs = sseqs;
nseq->alloc *= 2;
}
dbg("Have %u sseqs for type %u\n", nseq->alloc, type);
/* Insert new sub-sequence */
dbg("ins in pos %u, ff = %u\n", inspos, nseq->first_free);
sseq = &nseq->sseqs[inspos];
freesseq = &nseq->sseqs[nseq->first_free];
memmove(sseq + 1, sseq, (freesseq - sseq) * sizeof (*sseq));
memset(sseq, 0, sizeof (*sseq));
nseq->first_free++;
sseq->lower = lower;
sseq->upper = upper;
created_subseq = 1;
}
dbg("inserting {%u,%u,%u} from <0x%x:%u> into sseq %p(%u,%u) of seq %p\n",
type, lower, upper, node, port, sseq,
sseq->lower, sseq->upper, nseq);
/* Insert a publication: */
publ = publ_create(type, lower, upper, scope, node, port, key);
if (!publ)
return NULL;
dbg("inserting publ %p, node=0x%x publ->node=0x%x, subscr->node=%p\n",
publ, node, publ->node, publ->subscr.node);
if (!sseq->zone_list)
sseq->zone_list = publ->zone_list_next = publ;
else {
publ->zone_list_next = sseq->zone_list->zone_list_next;
sseq->zone_list->zone_list_next = publ;
}
if (in_own_cluster(node)) {
if (!sseq->cluster_list)
sseq->cluster_list = publ->cluster_list_next = publ;
else {
publ->cluster_list_next =
sseq->cluster_list->cluster_list_next;
sseq->cluster_list->cluster_list_next = publ;
}
}
if (node == tipc_own_addr) {
if (!sseq->node_list)
sseq->node_list = publ->node_list_next = publ;
else {
publ->node_list_next = sseq->node_list->node_list_next;
sseq->node_list->node_list_next = publ;
}
}
/*
* Any subscriptions waiting for notification?
*/
list_for_each_entry_safe(s, st, &nseq->subscriptions, nameseq_list) {
dbg("calling report_overlap()\n");
tipc_subscr_report_overlap(s,
publ->lower,
publ->upper,
TIPC_PUBLISHED,
publ->ref,
publ->node,
created_subseq);
}
return publ;
}
/**
* tipc_nameseq_remove_publ -
*
* NOTE: There may be cases where TIPC is asked to remove a publication
* that is not in the name table. For example, if another node issues a
* publication for a name sequence that overlaps an existing name sequence
* the publication will not be recorded, which means the publication won't
* be found when the name sequence is later withdrawn by that node.
* A failed withdraw request simply returns a failure indication and lets the
* caller issue any error or warning messages associated with such a problem.
*/
static struct publication *tipc_nameseq_remove_publ(struct name_seq *nseq, u32 inst,
u32 node, u32 ref, u32 key)
{
struct publication *publ;
struct publication *curr;
struct publication *prev;
struct sub_seq *sseq = nameseq_find_subseq(nseq, inst);
struct sub_seq *free;
struct subscription *s, *st;
int removed_subseq = 0;
if (!sseq)
return NULL;
dbg("tipc_nameseq_remove_publ: seq: %p, sseq %p, {%u,%u}, key %u\n",
nseq, sseq, nseq->type, inst, key);
/* Remove publication from zone scope list */
prev = sseq->zone_list;
publ = sseq->zone_list->zone_list_next;
while ((publ->key != key) || (publ->ref != ref) ||
(publ->node && (publ->node != node))) {
prev = publ;
publ = publ->zone_list_next;
if (prev == sseq->zone_list) {
/* Prevent endless loop if publication not found */
return NULL;
}
}
if (publ != sseq->zone_list)
prev->zone_list_next = publ->zone_list_next;
else if (publ->zone_list_next != publ) {
prev->zone_list_next = publ->zone_list_next;
sseq->zone_list = publ->zone_list_next;
} else {
sseq->zone_list = NULL;
}
/* Remove publication from cluster scope list, if present */
if (in_own_cluster(node)) {
prev = sseq->cluster_list;
curr = sseq->cluster_list->cluster_list_next;
while (curr != publ) {
prev = curr;
curr = curr->cluster_list_next;
if (prev == sseq->cluster_list) {
/* Prevent endless loop for malformed list */
err("Unable to de-list cluster publication\n"
"{%u%u}, node=0x%x, ref=%u, key=%u)\n",
publ->type, publ->lower, publ->node,
publ->ref, publ->key);
goto end_cluster;
}
}
if (publ != sseq->cluster_list)
prev->cluster_list_next = publ->cluster_list_next;
else if (publ->cluster_list_next != publ) {
prev->cluster_list_next = publ->cluster_list_next;
sseq->cluster_list = publ->cluster_list_next;
} else {
sseq->cluster_list = NULL;
}
}
end_cluster:
/* Remove publication from node scope list, if present */
if (node == tipc_own_addr) {
prev = sseq->node_list;
curr = sseq->node_list->node_list_next;
while (curr != publ) {
prev = curr;
curr = curr->node_list_next;
if (prev == sseq->node_list) {
/* Prevent endless loop for malformed list */
err("Unable to de-list node publication\n"
"{%u%u}, node=0x%x, ref=%u, key=%u)\n",
publ->type, publ->lower, publ->node,
publ->ref, publ->key);
goto end_node;
}
}
if (publ != sseq->node_list)
prev->node_list_next = publ->node_list_next;
else if (publ->node_list_next != publ) {
prev->node_list_next = publ->node_list_next;
sseq->node_list = publ->node_list_next;
} else {
sseq->node_list = NULL;
}
}
end_node:
/* Contract subseq list if no more publications for that subseq */
if (!sseq->zone_list) {
free = &nseq->sseqs[nseq->first_free--];
memmove(sseq, sseq + 1, (free - (sseq + 1)) * sizeof (*sseq));
removed_subseq = 1;
}
/* Notify any waiting subscriptions */
list_for_each_entry_safe(s, st, &nseq->subscriptions, nameseq_list) {
tipc_subscr_report_overlap(s,
publ->lower,
publ->upper,
TIPC_WITHDRAWN,
publ->ref,
publ->node,
removed_subseq);
}
return publ;
}
/**
* tipc_nameseq_subscribe: attach a subscription, and issue
* the prescribed number of events if there is any sub-
* sequence overlapping with the requested sequence
*/
static void tipc_nameseq_subscribe(struct name_seq *nseq, struct subscription *s)
{
struct sub_seq *sseq = nseq->sseqs;
list_add(&s->nameseq_list, &nseq->subscriptions);
if (!sseq)
return;
while (sseq != &nseq->sseqs[nseq->first_free]) {
struct publication *zl = sseq->zone_list;
if (zl && tipc_subscr_overlap(s,sseq->lower,sseq->upper)) {
struct publication *crs = zl;
int must_report = 1;
do {
tipc_subscr_report_overlap(s,
sseq->lower,
sseq->upper,
TIPC_PUBLISHED,
crs->ref,
crs->node,
must_report);
must_report = 0;
crs = crs->zone_list_next;
} while (crs != zl);
}
sseq++;
}
}
static struct name_seq *nametbl_find_seq(u32 type)
{
struct hlist_head *seq_head;
struct hlist_node *seq_node;
struct name_seq *ns;
dbg("find_seq %u,(%u,0x%x) table = %p, hash[type] = %u\n",
type, ntohl(type), type, table.types, hash(type));
seq_head = &table.types[hash(type)];
hlist_for_each_entry(ns, seq_node, seq_head, ns_list) {
if (ns->type == type) {
dbg("found %p\n", ns);
return ns;
}
}
return NULL;
};
struct publication *tipc_nametbl_insert_publ(u32 type, u32 lower, u32 upper,
u32 scope, u32 node, u32 port, u32 key)
{
struct name_seq *seq = nametbl_find_seq(type);
dbg("tipc_nametbl_insert_publ: {%u,%u,%u} found %p\n", type, lower, upper, seq);
if (lower > upper) {
warn("Failed to publish illegal {%u,%u,%u}\n",
type, lower, upper);
return NULL;
}
dbg("Publishing {%u,%u,%u} from 0x%x\n", type, lower, upper, node);
if (!seq) {
seq = tipc_nameseq_create(type, &table.types[hash(type)]);
dbg("tipc_nametbl_insert_publ: created %p\n", seq);
}
if (!seq)
return NULL;
return tipc_nameseq_insert_publ(seq, type, lower, upper,
scope, node, port, key);
}
struct publication *tipc_nametbl_remove_publ(u32 type, u32 lower,
u32 node, u32 ref, u32 key)
{
struct publication *publ;
struct name_seq *seq = nametbl_find_seq(type);
if (!seq)
return NULL;
dbg("Withdrawing {%u,%u} from 0x%x\n", type, lower, node);
publ = tipc_nameseq_remove_publ(seq, lower, node, ref, key);
if (!seq->first_free && list_empty(&seq->subscriptions)) {
hlist_del_init(&seq->ns_list);
kfree(seq->sseqs);
kfree(seq);
}
return publ;
}
/*
* tipc_nametbl_translate(): Translate tipc_name -> tipc_portid.
* Very time-critical.
*
* Note: on entry 'destnode' is the search domain used during translation;
* on exit it passes back the node address of the matching port (if any)
*/
u32 tipc_nametbl_translate(u32 type, u32 instance, u32 *destnode)
{
struct sub_seq *sseq;
struct publication *publ = NULL;
struct name_seq *seq;
u32 ref;
if (!in_scope(*destnode, tipc_own_addr))
return 0;
read_lock_bh(&tipc_nametbl_lock);
seq = nametbl_find_seq(type);
if (unlikely(!seq))
goto not_found;
sseq = nameseq_find_subseq(seq, instance);
if (unlikely(!sseq))
goto not_found;
spin_lock_bh(&seq->lock);
/* Closest-First Algorithm: */
if (likely(!*destnode)) {
publ = sseq->node_list;
if (publ) {
sseq->node_list = publ->node_list_next;
found:
ref = publ->ref;
*destnode = publ->node;
spin_unlock_bh(&seq->lock);
read_unlock_bh(&tipc_nametbl_lock);
return ref;
}
publ = sseq->cluster_list;
if (publ) {
sseq->cluster_list = publ->cluster_list_next;
goto found;
}
publ = sseq->zone_list;
if (publ) {
sseq->zone_list = publ->zone_list_next;
goto found;
}
}
/* Round-Robin Algorithm: */
else if (*destnode == tipc_own_addr) {
publ = sseq->node_list;
if (publ) {
sseq->node_list = publ->node_list_next;
goto found;
}
} else if (in_own_cluster(*destnode)) {
publ = sseq->cluster_list;
if (publ) {
sseq->cluster_list = publ->cluster_list_next;
goto found;
}
} else {
publ = sseq->zone_list;
if (publ) {
sseq->zone_list = publ->zone_list_next;
goto found;
}
}
spin_unlock_bh(&seq->lock);
not_found:
*destnode = 0;
read_unlock_bh(&tipc_nametbl_lock);
return 0;
}
/**
* tipc_nametbl_mc_translate - find multicast destinations
*
* Creates list of all local ports that overlap the given multicast address;
* also determines if any off-node ports overlap.
*
* Note: Publications with a scope narrower than 'limit' are ignored.
* (i.e. local node-scope publications mustn't receive messages arriving
* from another node, even if the multcast link brought it here)
*
* Returns non-zero if any off-node ports overlap
*/
int tipc_nametbl_mc_translate(u32 type, u32 lower, u32 upper, u32 limit,
struct port_list *dports)
{
struct name_seq *seq;
struct sub_seq *sseq;
struct sub_seq *sseq_stop;
int res = 0;
read_lock_bh(&tipc_nametbl_lock);
seq = nametbl_find_seq(type);
if (!seq)
goto exit;
spin_lock_bh(&seq->lock);
sseq = seq->sseqs + nameseq_locate_subseq(seq, lower);
sseq_stop = seq->sseqs + seq->first_free;
for (; sseq != sseq_stop; sseq++) {
struct publication *publ;
if (sseq->lower > upper)
break;
publ = sseq->cluster_list;
if (publ && (publ->scope <= limit))
do {
if (publ->node == tipc_own_addr)
tipc_port_list_add(dports, publ->ref);
else
res = 1;
publ = publ->cluster_list_next;
} while (publ != sseq->cluster_list);
}
spin_unlock_bh(&seq->lock);
exit:
read_unlock_bh(&tipc_nametbl_lock);
return res;
}
/**
* tipc_nametbl_publish_rsv - publish port name using a reserved name type
*/
int tipc_nametbl_publish_rsv(u32 ref, unsigned int scope,
struct tipc_name_seq const *seq)
{
int res;
atomic_inc(&rsv_publ_ok);
res = tipc_publish(ref, scope, seq);
atomic_dec(&rsv_publ_ok);
return res;
}
/**
* tipc_nametbl_publish - add name publication to network name tables
*/
struct publication *tipc_nametbl_publish(u32 type, u32 lower, u32 upper,
u32 scope, u32 port_ref, u32 key)
{
struct publication *publ;
if (table.local_publ_count >= tipc_max_publications) {
warn("Publication failed, local publication limit reached (%u)\n",
tipc_max_publications);
return NULL;
}
if ((type < TIPC_RESERVED_TYPES) && !atomic_read(&rsv_publ_ok)) {
warn("Publication failed, reserved name {%u,%u,%u}\n",
type, lower, upper);
return NULL;
}
write_lock_bh(&tipc_nametbl_lock);
table.local_publ_count++;
publ = tipc_nametbl_insert_publ(type, lower, upper, scope,
tipc_own_addr, port_ref, key);
if (publ && (scope != TIPC_NODE_SCOPE)) {
tipc_named_publish(publ);
}
write_unlock_bh(&tipc_nametbl_lock);
return publ;
}
/**
* tipc_nametbl_withdraw - withdraw name publication from network name tables
*/
int tipc_nametbl_withdraw(u32 type, u32 lower, u32 ref, u32 key)
{
struct publication *publ;
dbg("tipc_nametbl_withdraw: {%u,%u}, key=%u\n", type, lower, key);
write_lock_bh(&tipc_nametbl_lock);
publ = tipc_nametbl_remove_publ(type, lower, tipc_own_addr, ref, key);
if (likely(publ)) {
table.local_publ_count--;
if (publ->scope != TIPC_NODE_SCOPE)
tipc_named_withdraw(publ);
write_unlock_bh(&tipc_nametbl_lock);
list_del_init(&publ->pport_list);
kfree(publ);
return 1;
}
write_unlock_bh(&tipc_nametbl_lock);
err("Unable to remove local publication\n"
"(type=%u, lower=%u, ref=%u, key=%u)\n",
type, lower, ref, key);
return 0;
}
/**
* tipc_nametbl_subscribe - add a subscription object to the name table
*/
void tipc_nametbl_subscribe(struct subscription *s)
{
u32 type = s->seq.type;
struct name_seq *seq;
write_lock_bh(&tipc_nametbl_lock);
seq = nametbl_find_seq(type);
if (!seq) {
seq = tipc_nameseq_create(type, &table.types[hash(type)]);
}
if (seq){
spin_lock_bh(&seq->lock);
dbg("tipc_nametbl_subscribe:found %p for {%u,%u,%u}\n",
seq, type, s->seq.lower, s->seq.upper);
tipc_nameseq_subscribe(seq, s);
spin_unlock_bh(&seq->lock);
} else {
warn("Failed to create subscription for {%u,%u,%u}\n",
s->seq.type, s->seq.lower, s->seq.upper);
}
write_unlock_bh(&tipc_nametbl_lock);
}
/**
* tipc_nametbl_unsubscribe - remove a subscription object from name table
*/
void tipc_nametbl_unsubscribe(struct subscription *s)
{
struct name_seq *seq;
write_lock_bh(&tipc_nametbl_lock);
seq = nametbl_find_seq(s->seq.type);
if (seq != NULL){
spin_lock_bh(&seq->lock);
list_del_init(&s->nameseq_list);
spin_unlock_bh(&seq->lock);
if ((seq->first_free == 0) && list_empty(&seq->subscriptions)) {
hlist_del_init(&seq->ns_list);
kfree(seq->sseqs);
kfree(seq);
}
}
write_unlock_bh(&tipc_nametbl_lock);
}
/**
* subseq_list: print specified sub-sequence contents into the given buffer
*/
static void subseq_list(struct sub_seq *sseq, struct print_buf *buf, u32 depth,
u32 index)
{
char portIdStr[27];
char *scopeStr;
struct publication *publ = sseq->zone_list;
tipc_printf(buf, "%-10u %-10u ", sseq->lower, sseq->upper);
if (depth == 2 || !publ) {
tipc_printf(buf, "\n");
return;
}
do {
sprintf (portIdStr, "<%u.%u.%u:%u>",
tipc_zone(publ->node), tipc_cluster(publ->node),
tipc_node(publ->node), publ->ref);
tipc_printf(buf, "%-26s ", portIdStr);
if (depth > 3) {
if (publ->node != tipc_own_addr)
scopeStr = "";
else if (publ->scope == TIPC_NODE_SCOPE)
scopeStr = "node";
else if (publ->scope == TIPC_CLUSTER_SCOPE)
scopeStr = "cluster";
else
scopeStr = "zone";
tipc_printf(buf, "%-10u %s", publ->key, scopeStr);
}
publ = publ->zone_list_next;
if (publ == sseq->zone_list)
break;
tipc_printf(buf, "\n%33s", " ");
} while (1);
tipc_printf(buf, "\n");
}
/**
* nameseq_list: print specified name sequence contents into the given buffer
*/
static void nameseq_list(struct name_seq *seq, struct print_buf *buf, u32 depth,
u32 type, u32 lowbound, u32 upbound, u32 index)
{
struct sub_seq *sseq;
char typearea[11];
sprintf(typearea, "%-10u", seq->type);
if (depth == 1) {
tipc_printf(buf, "%s\n", typearea);
return;
}
for (sseq = seq->sseqs; sseq != &seq->sseqs[seq->first_free]; sseq++) {
if ((lowbound <= sseq->upper) && (upbound >= sseq->lower)) {
tipc_printf(buf, "%s ", typearea);
subseq_list(sseq, buf, depth, index);
sprintf(typearea, "%10s", " ");
}
}
}
/**
* nametbl_header - print name table header into the given buffer
*/
static void nametbl_header(struct print_buf *buf, u32 depth)
{
tipc_printf(buf, "Type ");
if (depth > 1)
tipc_printf(buf, "Lower Upper ");
if (depth > 2)
tipc_printf(buf, "Port Identity ");
if (depth > 3)
tipc_printf(buf, "Publication");
tipc_printf(buf, "\n-----------");
if (depth > 1)
tipc_printf(buf, "--------------------- ");
if (depth > 2)
tipc_printf(buf, "-------------------------- ");
if (depth > 3)
tipc_printf(buf, "------------------");
tipc_printf(buf, "\n");
}
/**
* nametbl_list - print specified name table contents into the given buffer
*/
static void nametbl_list(struct print_buf *buf, u32 depth_info,
u32 type, u32 lowbound, u32 upbound)
{
struct hlist_head *seq_head;
struct hlist_node *seq_node;
struct name_seq *seq;
int all_types;
u32 depth;
u32 i;
all_types = (depth_info & TIPC_NTQ_ALLTYPES);
depth = (depth_info & ~TIPC_NTQ_ALLTYPES);
if (depth == 0)
return;
if (all_types) {
/* display all entries in name table to specified depth */
nametbl_header(buf, depth);
lowbound = 0;
upbound = ~0;
for (i = 0; i < tipc_nametbl_size; i++) {
seq_head = &table.types[i];
hlist_for_each_entry(seq, seq_node, seq_head, ns_list) {
nameseq_list(seq, buf, depth, seq->type,
lowbound, upbound, i);
}
}
} else {
/* display only the sequence that matches the specified type */
if (upbound < lowbound) {
tipc_printf(buf, "invalid name sequence specified\n");
return;
}
nametbl_header(buf, depth);
i = hash(type);
seq_head = &table.types[i];
hlist_for_each_entry(seq, seq_node, seq_head, ns_list) {
if (seq->type == type) {
nameseq_list(seq, buf, depth, type,
lowbound, upbound, i);
break;
}
}
}
}
#if 0
void tipc_nametbl_print(struct print_buf *buf, const char *str)
{
tipc_printf(buf, str);
read_lock_bh(&tipc_nametbl_lock);
nametbl_list(buf, 0, 0, 0, 0);
read_unlock_bh(&tipc_nametbl_lock);
}
#endif
#define MAX_NAME_TBL_QUERY 32768
struct sk_buff *tipc_nametbl_get(const void *req_tlv_area, int req_tlv_space)
{
struct sk_buff *buf;
struct tipc_name_table_query *argv;
struct tlv_desc *rep_tlv;
struct print_buf b;
int str_len;
if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NAME_TBL_QUERY))
return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_NAME_TBL_QUERY));
if (!buf)
return NULL;
rep_tlv = (struct tlv_desc *)buf->data;
tipc_printbuf_init(&b, TLV_DATA(rep_tlv), MAX_NAME_TBL_QUERY);
argv = (struct tipc_name_table_query *)TLV_DATA(req_tlv_area);
read_lock_bh(&tipc_nametbl_lock);
nametbl_list(&b, ntohl(argv->depth), ntohl(argv->type),
ntohl(argv->lowbound), ntohl(argv->upbound));
read_unlock_bh(&tipc_nametbl_lock);
str_len = tipc_printbuf_validate(&b);
skb_put(buf, TLV_SPACE(str_len));
TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
return buf;
}
#if 0
void tipc_nametbl_dump(void)
{
nametbl_list(TIPC_CONS, 0, 0, 0, 0);
}
#endif
int tipc_nametbl_init(void)
{
int array_size = sizeof(struct hlist_head) * tipc_nametbl_size;
table.types = kzalloc(array_size, GFP_ATOMIC);
if (!table.types)
return -ENOMEM;
write_lock_bh(&tipc_nametbl_lock);
table.local_publ_count = 0;
write_unlock_bh(&tipc_nametbl_lock);
return 0;
}
void tipc_nametbl_stop(void)
{
u32 i;
if (!table.types)
return;
/* Verify name table is empty, then release it */
write_lock_bh(&tipc_nametbl_lock);
for (i = 0; i < tipc_nametbl_size; i++) {
if (!hlist_empty(&table.types[i]))
err("tipc_nametbl_stop(): hash chain %u is non-null\n", i);
}
kfree(table.types);
table.types = NULL;
write_unlock_bh(&tipc_nametbl_lock);
}
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