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Diffstat (limited to 'net/tipc/name_table.c')
| -rw-r--r-- | net/tipc/name_table.c | 1104 |
1 files changed, 1104 insertions, 0 deletions
diff --git a/net/tipc/name_table.c b/net/tipc/name_table.c new file mode 100644 index 00000000..8ba79620 --- /dev/null +++ b/net/tipc/name_table.c @@ -0,0 +1,1104 @@ +/* + * net/tipc/name_table.c: TIPC name table code + * + * Copyright (c) 2000-2006, Ericsson AB + * Copyright (c) 2004-2008, 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 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 sub_seq { + u32 lower; + u32 upper; + struct publication *node_list; + struct publication *cluster_list; + struct publication *zone_list; + u32 node_list_size; + u32 cluster_list_size; + u32 zone_list_size; +}; + +/** + * 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 = { 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); + + sseq->zone_list_size++; + 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)) { + sseq->cluster_list_size++; + 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) { + sseq->node_list_size++; + 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; + } + sseq->zone_list_size--; + + /* 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; + } + sseq->cluster_list_size--; + } +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; + } + sseq->node_list_size--; + } +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, htonl(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 (!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); + + /* 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->node_list; + if (publ) { + do { + if (publ->scope <= limit) + tipc_port_list_add(dports, publ->ref); + publ = publ->node_list_next; + } while (publ != sseq->node_list); + } + + if (sseq->cluster_list_size != sseq->node_list_size) + res = 1; + } + + 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]; + + if (seq->first_free == 0) + return; + + 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); + spin_lock_bh(&seq->lock); + subseq_list(sseq, buf, depth, index); + spin_unlock_bh(&seq->lock); + 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) +{ + table.types = kcalloc(tipc_nametbl_size, sizeof(struct hlist_head), + GFP_ATOMIC); + if (!table.types) + return -ENOMEM; + + table.local_publ_count = 0; + 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); +} + |