- 根目录:
- net
- tipc
- name_table.c
/*
* net/tipc/name_table.c: TIPC name table code
*
* Copyright (c) 2000-2006, Ericsson AB
* Copyright (c) 2004-2008, 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 "config.h"
#include "name_table.h"
#include "name_distr.h"
#include "subscr.h"
#include "port.h"
#define TIPC_NAMETBL_SIZE 1024 /* must be a power of 2 */
/**
* struct name_info - name sequence publication info
* @node_list: circular list of publications made by own node
* @cluster_list: circular list of publications made by own cluster
* @zone_list: circular list of publications made by own zone
* @node_list_size: number of entries in "node_list"
* @cluster_list_size: number of entries in "cluster_list"
* @zone_list_size: number of entries in "zone_list"
*
* Note: The zone list always contains at least one entry, since all
* publications of the associated name sequence belong to it.
* (The cluster and node lists may be empty.)
*/
struct name_info {
struct list_head node_list;
struct list_head cluster_list;
struct list_head zone_list;
u32 node_list_size;
u32 cluster_list_size;
u32 zone_list_size;
};
/**
* struct sub_seq - container for all published instances of a name sequence
* @lower: name sequence lower bound
* @upper: name sequence upper bound
* @info: pointer to name sequence publication info
*/
struct sub_seq {
u32 lower;
u32 upper;
struct name_info *info;
};
/**
* 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 publication lists of all sub-sequences
*/
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;
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) {
pr_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)
{
return kcalloc(cnt, sizeof(struct sub_seq), GFP_ATOMIC);
}
/**
* 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) {
pr_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;
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_delete_empty - deletes a name sequence structure if now unused
*/
static void nameseq_delete_empty(struct name_seq *seq)
{
if (!seq->first_free && list_empty(&seq->subscriptions)) {
hlist_del_init(&seq->ns_list);
kfree(seq->sseqs);
kfree(seq);
}
}
/**
* 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 tipc_subscription *s;
struct tipc_subscription *st;
struct publication *publ;
struct sub_seq *sseq;
struct name_info *info;
int created_subseq = 0;
sseq = nameseq_find_subseq(nseq, lower);
if (sseq) {
/* Lower end overlaps existing entry => need an exact match */
if ((sseq->lower != lower) || (sseq->upper != upper)) {
pr_warn("Cannot publish {%u,%u,%u}, overlap error\n",
type, lower, upper);
return NULL;
}
info = sseq->info;
/* Check if an identical publication already exists */
list_for_each_entry(publ, &info->zone_list, zone_list) {
if ((publ->ref == port) && (publ->key == key) &&
(!publ->node || (publ->node == node)))
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)) {
pr_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) {
pr_warn("Cannot publish {%u,%u,%u}, no memory\n",
type, lower, upper);
return NULL;
}
memcpy(sseqs, nseq->sseqs,
nseq->alloc * sizeof(struct sub_seq));
kfree(nseq->sseqs);
nseq->sseqs = sseqs;
nseq->alloc *= 2;
}
info = kzalloc(sizeof(*info), GFP_ATOMIC);
if (!info) {
pr_warn("Cannot publish {%u,%u,%u}, no memory\n",
type, lower, upper);
return NULL;
}
INIT_LIST_HEAD(&info->node_list);
INIT_LIST_HEAD(&info->cluster_list);
INIT_LIST_HEAD(&info->zone_list);
/* Insert new sub-sequence */
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;
sseq->info = info;
created_subseq = 1;
}
/* Insert a publication */
publ = publ_create(type, lower, upper, scope, node, port, key);
if (!publ)
return NULL;
list_add(&publ->zone_list, &info->zone_list);
info->zone_list_size++;
if (in_own_cluster(node)) {
list_add(&publ->cluster_list, &info->cluster_list);
info->cluster_list_size++;
}
if (in_own_node(node)) {
list_add(&publ->node_list, &info->node_list);
info->node_list_size++;
}
/* Any subscriptions waiting for notification? */
list_for_each_entry_safe(s, st, &nseq->subscriptions, nameseq_list) {
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 sub_seq *sseq = nameseq_find_subseq(nseq, inst);
struct name_info *info;
struct sub_seq *free;
struct tipc_subscription *s, *st;
int removed_subseq = 0;
if (!sseq)
return NULL;
info = sseq->info;
/* Locate publication, if it exists */
list_for_each_entry(publ, &info->zone_list, zone_list) {
if ((publ->key == key) && (publ->ref == ref) &&
(!publ->node || (publ->node == node)))
goto found;
}
return NULL;
found:
/* Remove publication from zone scope list */
list_del(&publ->zone_list);
info->zone_list_size--;
/* Remove publication from cluster scope list, if present */
if (in_own_cluster(node)) {
list_del(&publ->cluster_list);
info->cluster_list_size--;
}
/* Remove publication from node scope list, if present */
if (in_own_node(node)) {
list_del(&publ->node_list);
info->node_list_size--;
}
/* Contract subseq list if no more publications for that subseq */
if (list_empty(&info->zone_list)) {
kfree(info);
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 tipc_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]) {
if (tipc_subscr_overlap(s, sseq->lower, sseq->upper)) {
struct publication *crs;
struct name_info *info = sseq->info;
int must_report = 1;
list_for_each_entry(crs, &info->zone_list, zone_list) {
tipc_subscr_report_overlap(s,
sseq->lower,
sseq->upper,
TIPC_PUBLISHED,
crs->ref,
crs->node,
must_report);
must_report = 0;
}
}
sseq++;
}
}
static struct name_seq *nametbl_find_seq(u32 type)
{
struct hlist_head *seq_head;
struct name_seq *ns;
seq_head = &table.types[hash(type)];
hlist_for_each_entry(ns, seq_head, ns_list) {
if (ns->type == type)
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);
if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE) ||
(lower > upper)) {
pr_debug("Failed to publish illegal {%u,%u,%u} with scope %u\n",
type, lower, upper, scope);
return NULL;
}
if (!seq)
seq = tipc_nameseq_create(type, &table.types[hash(type)]);
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;
publ = tipc_nameseq_remove_publ(seq, lower, node, ref, key);
nameseq_delete_empty(seq);
return publ;
}
/**
* tipc_nametbl_translate - perform name translation
*
* On entry, 'destnode' is the search domain used during translation.
*
* On exit:
* - if name translation is deferred to another node/cluster/zone,
* leaves 'destnode' unchanged (will be non-zero) and returns 0
* - if name translation is attempted and succeeds, sets 'destnode'
* to publishing node and returns port reference (will be non-zero)
* - if name translation is attempted and fails, sets 'destnode' to 0
* and returns 0
*/
u32 tipc_nametbl_translate(u32 type, u32 instance, u32 *destnode)
{
struct sub_seq *sseq;
struct name_info *info;
struct publication *publ;
struct name_seq *seq;
u32 ref = 0;
u32 node = 0;
if (!tipc_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);
info = sseq->info;
/* Closest-First Algorithm */
if (likely(!*destnode)) {
if (!list_empty(&info->node_list)) {
publ = list_first_entry(&info->node_list,
struct publication,
node_list);
list_move_tail(&publ->node_list,
&info->node_list);
} else if (!list_empty(&info->cluster_list)) {
publ = list_first_entry(&info->cluster_list,
struct publication,
cluster_list);
list_move_tail(&publ->cluster_list,
&info->cluster_list);
} else {
publ = list_first_entry(&info->zone_list,
struct publication,
zone_list);
list_move_tail(&publ->zone_list,
&info->zone_list);
}
}
/* Round-Robin Algorithm */
else if (*destnode == tipc_own_addr) {
if (list_empty(&info->node_list))
goto no_match;
publ = list_first_entry(&info->node_list, struct publication,
node_list);
list_move_tail(&publ->node_list, &info->node_list);
} else if (in_own_cluster_exact(*destnode)) {
if (list_empty(&info->cluster_list))
goto no_match;
publ = list_first_entry(&info->cluster_list, struct publication,
cluster_list);
list_move_tail(&publ->cluster_list, &info->cluster_list);
} else {
publ = list_first_entry(&info->zone_list, struct publication,
zone_list);
list_move_tail(&publ->zone_list, &info->zone_list);
}
ref = publ->ref;
node = publ->node;
no_match:
spin_unlock_bh(&seq->lock);
not_found:
read_unlock_bh(&tipc_nametbl_lock);
*destnode = node;
return ref;
}
/**
* 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 tipc_port_list *dports)
{
struct name_seq *seq;
struct sub_seq *sseq;
struct sub_seq *sseq_stop;
struct name_info *info;
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;
info = sseq->info;
list_for_each_entry(publ, &info->node_list, node_list) {
if (publ->scope <= limit)
tipc_port_list_add(dports, publ->ref);
}
if (info->cluster_list_size != info->node_list_size)
res = 1;
}
spin_unlock_bh(&seq->lock);
exit:
read_unlock_bh(&tipc_nametbl_lock);
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) {
pr_warn("Publication failed, local publication limit reached (%u)\n",
TIPC_MAX_PUBLICATIONS);
return NULL;
}
write_lock_bh(&tipc_nametbl_lock);
publ = tipc_nametbl_insert_publ(type, lower, upper, scope,
tipc_own_addr, port_ref, key);
if (likely(publ)) {
table.local_publ_count++;
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;
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--;
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);
pr_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 tipc_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);
tipc_nameseq_subscribe(seq, s);
spin_unlock_bh(&seq->lock);
} else {
pr_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 tipc_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);
nameseq_delete_empty(seq);
}
write_unlock_bh(&tipc_nametbl_lock);
}
/**
* subseq_list - print specified sub-sequence contents into the given buffer
*/
static int subseq_list(struct sub_seq *sseq, char *buf, int len, u32 depth,
u32 index)
{
char portIdStr[27];
const char *scope_str[] = {"", " zone", " cluster", " node"};
struct publication *publ;
struct name_info *info;
int ret;
ret = tipc_snprintf(buf, len, "%-10u %-10u ", sseq->lower, sseq->upper);
if (depth == 2) {
ret += tipc_snprintf(buf - ret, len + ret, "\n");
return ret;
}
info = sseq->info;
list_for_each_entry(publ, &info->zone_list, zone_list) {
sprintf(portIdStr, "<%u.%u.%u:%u>",
tipc_zone(publ->node), tipc_cluster(publ->node),
tipc_node(publ->node), publ->ref);
ret += tipc_snprintf(buf + ret, len - ret, "%-26s ", portIdStr);
if (depth > 3) {
ret += tipc_snprintf(buf + ret, len - ret, "%-10u %s",
publ->key, scope_str[publ->scope]);
}
if (!list_is_last(&publ->zone_list, &info->zone_list))
ret += tipc_snprintf(buf + ret, len - ret,
"\n%33s", " ");
}
ret += tipc_snprintf(buf + ret, len - ret, "\n");
return ret;
}
/**
* nameseq_list - print specified name sequence contents into the given buffer
*/
static int nameseq_list(struct name_seq *seq, char *buf, int len, u32 depth,
u32 type, u32 lowbound, u32 upbound, u32 index)
{
struct sub_seq *sseq;
char typearea[11];
int ret = 0;
if (seq->first_free == 0)
return 0;
sprintf(typearea, "%-10u", seq->type);
if (depth == 1) {
ret += tipc_snprintf(buf, len, "%s\n", typearea);
return ret;
}
for (sseq = seq->sseqs; sseq != &seq->sseqs[seq->first_free]; sseq++) {
if ((lowbound <= sseq->upper) && (upbound >= sseq->lower)) {
ret += tipc_snprintf(buf + ret, len - ret, "%s ",
typearea);
spin_lock_bh(&seq->lock);
ret += subseq_list(sseq, buf + ret, len - ret,
depth, index);
spin_unlock_bh(&seq->lock);
sprintf(typearea, "%10s", " ");
}
}
return ret;
}
/**
* nametbl_header - print name table header into the given buffer
*/
static int nametbl_header(char *buf, int len, u32 depth)
{
const char *header[] = {
"Type ",
"Lower Upper ",
"Port Identity ",
"Publication Scope"
};
int i;
int ret = 0;
if (depth > 4)
depth = 4;
for (i = 0; i < depth; i++)
ret += tipc_snprintf(buf + ret, len - ret, header[i]);
ret += tipc_snprintf(buf + ret, len - ret, "\n");
return ret;
}
/**
* nametbl_list - print specified name table contents into the given buffer
*/
static int nametbl_list(char *buf, int len, u32 depth_info,
u32 type, u32 lowbound, u32 upbound)
{
struct hlist_head *seq_head;
struct name_seq *seq;
int all_types;
int ret = 0;
u32 depth;
u32 i;
all_types = (depth_info & TIPC_NTQ_ALLTYPES);
depth = (depth_info & ~TIPC_NTQ_ALLTYPES);
if (depth == 0)
return 0;
if (all_types) {
/* display all entries in name table to specified depth */
ret += nametbl_header(buf, len, depth);
lowbound = 0;
upbound = ~0;
for (i = 0; i < TIPC_NAMETBL_SIZE; i++) {
seq_head = &table.types[i];
hlist_for_each_entry(seq, seq_head, ns_list) {
ret += nameseq_list(seq, buf + ret, len - ret,
depth, seq->type,
lowbound, upbound, i);
}
}
} else {
/* display only the sequence that matches the specified type */
if (upbound < lowbound) {
ret += tipc_snprintf(buf + ret, len - ret,
"invalid name sequence specified\n");
return ret;
}
ret += nametbl_header(buf + ret, len - ret, depth);
i = hash(type);
seq_head = &table.types[i];
hlist_for_each_entry(seq, seq_head, ns_list) {
if (seq->type == type) {
ret += nameseq_list(seq, buf + ret, len - ret,
depth, type,
lowbound, upbound, i);
break;
}
}
}
return ret;
}
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;
char *pb;
int pb_len;
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(ULTRA_STRING_MAX_LEN));
if (!buf)
return NULL;
rep_tlv = (struct tlv_desc *)buf->data;
pb = TLV_DATA(rep_tlv);
pb_len = ULTRA_STRING_MAX_LEN;
argv = (struct tipc_name_table_query *)TLV_DATA(req_tlv_area);
read_lock_bh(&tipc_nametbl_lock);
str_len = nametbl_list(pb, pb_len, ntohl(argv->depth),
ntohl(argv->type),
ntohl(argv->lowbound), ntohl(argv->upbound));
read_unlock_bh(&tipc_nametbl_lock);
str_len += 1; /* for "\0" */
skb_put(buf, TLV_SPACE(str_len));
TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
return buf;
}
int tipc_nametbl_init(void)
{
table.types = kcalloc(TIPC_NAMETBL_SIZE, sizeof(struct hlist_head),
GFP_ATOMIC);
if (!table.types)
return -ENOMEM;
table.local_publ_count = 0;
return 0;
}
/**
* tipc_purge_publications - remove all publications for a given type
*
* tipc_nametbl_lock must be held when calling this function
*/
static void tipc_purge_publications(struct name_seq *seq)
{
struct publication *publ, *safe;
struct sub_seq *sseq;
struct name_info *info;
if (!seq->sseqs) {
nameseq_delete_empty(seq);
return;
}
sseq = seq->sseqs;
info = sseq->info;
list_for_each_entry_safe(publ, safe, &info->zone_list, zone_list) {
tipc_nametbl_remove_publ(publ->type, publ->lower, publ->node,
publ->ref, publ->key);
}
}
void tipc_nametbl_stop(void)
{
u32 i;
struct name_seq *seq;
struct hlist_head *seq_head;
struct hlist_node *safe;
/* Verify name table is empty and purge any lingering
* publications, then release the name table
*/
write_lock_bh(&tipc_nametbl_lock);
for (i = 0; i < TIPC_NAMETBL_SIZE; i++) {
if (hlist_empty(&table.types[i]))
continue;
seq_head = &table.types[i];
hlist_for_each_entry_safe(seq, safe, seq_head, ns_list) {
tipc_purge_publications(seq);
}
continue;
}
kfree(table.types);
table.types = NULL;
write_unlock_bh(&tipc_nametbl_lock);
}