![Jon Paul Maloy](/assets/img/avatar_default.png)
The file name_distr.c currently contains three functions, named_cluster_distribute(), tipc_publ_subcscribe() and tipc_publ_unsubscribe() that all directly access fields in struct tipc_node. We want to eliminate such dependencies, so we move those functions to the file node.c and rename them to tipc_node_broadcast(), tipc_node_subscribe() and tipc_node_unsubscribe() respectively. Reviewed-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1062 lines
28 KiB
C
1062 lines
28 KiB
C
/*
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* net/tipc/name_table.c: TIPC name table code
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*
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* Copyright (c) 2000-2006, 2014-2015, Ericsson AB
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* Copyright (c) 2004-2008, 2010-2014, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <net/sock.h>
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#include "core.h"
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#include "netlink.h"
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#include "name_table.h"
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#include "name_distr.h"
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#include "subscr.h"
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#include "bcast.h"
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#include "addr.h"
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#include "node.h"
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#include <net/genetlink.h>
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#define TIPC_NAMETBL_SIZE 1024 /* must be a power of 2 */
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static const struct nla_policy
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tipc_nl_name_table_policy[TIPC_NLA_NAME_TABLE_MAX + 1] = {
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[TIPC_NLA_NAME_TABLE_UNSPEC] = { .type = NLA_UNSPEC },
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[TIPC_NLA_NAME_TABLE_PUBL] = { .type = NLA_NESTED }
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};
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/**
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* struct name_info - name sequence publication info
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* @node_list: circular list of publications made by own node
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* @cluster_list: circular list of publications made by own cluster
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* @zone_list: circular list of publications made by own zone
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* @node_list_size: number of entries in "node_list"
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* @cluster_list_size: number of entries in "cluster_list"
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* @zone_list_size: number of entries in "zone_list"
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*
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* Note: The zone list always contains at least one entry, since all
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* publications of the associated name sequence belong to it.
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* (The cluster and node lists may be empty.)
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*/
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struct name_info {
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struct list_head node_list;
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struct list_head cluster_list;
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struct list_head zone_list;
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u32 node_list_size;
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u32 cluster_list_size;
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u32 zone_list_size;
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};
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/**
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* struct sub_seq - container for all published instances of a name sequence
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* @lower: name sequence lower bound
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* @upper: name sequence upper bound
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* @info: pointer to name sequence publication info
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*/
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struct sub_seq {
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u32 lower;
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u32 upper;
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struct name_info *info;
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};
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/**
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* struct name_seq - container for all published instances of a name type
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* @type: 32 bit 'type' value for name sequence
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* @sseq: pointer to dynamically-sized array of sub-sequences of this 'type';
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* sub-sequences are sorted in ascending order
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* @alloc: number of sub-sequences currently in array
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* @first_free: array index of first unused sub-sequence entry
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* @ns_list: links to adjacent name sequences in hash chain
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* @subscriptions: list of subscriptions for this 'type'
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* @lock: spinlock controlling access to publication lists of all sub-sequences
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* @rcu: RCU callback head used for deferred freeing
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*/
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struct name_seq {
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u32 type;
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struct sub_seq *sseqs;
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u32 alloc;
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u32 first_free;
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struct hlist_node ns_list;
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struct list_head subscriptions;
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spinlock_t lock;
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struct rcu_head rcu;
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};
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static int hash(int x)
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{
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return x & (TIPC_NAMETBL_SIZE - 1);
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}
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/**
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* publ_create - create a publication structure
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*/
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static struct publication *publ_create(u32 type, u32 lower, u32 upper,
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u32 scope, u32 node, u32 port_ref,
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u32 key)
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{
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struct publication *publ = kzalloc(sizeof(*publ), GFP_ATOMIC);
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if (publ == NULL) {
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pr_warn("Publication creation failure, no memory\n");
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return NULL;
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}
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publ->type = type;
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publ->lower = lower;
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publ->upper = upper;
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publ->scope = scope;
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publ->node = node;
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publ->ref = port_ref;
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publ->key = key;
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INIT_LIST_HEAD(&publ->pport_list);
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return publ;
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}
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/**
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* tipc_subseq_alloc - allocate a specified number of sub-sequence structures
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*/
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static struct sub_seq *tipc_subseq_alloc(u32 cnt)
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{
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return kcalloc(cnt, sizeof(struct sub_seq), GFP_ATOMIC);
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}
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/**
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* tipc_nameseq_create - create a name sequence structure for the specified 'type'
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*
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* Allocates a single sub-sequence structure and sets it to all 0's.
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*/
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static struct name_seq *tipc_nameseq_create(u32 type, struct hlist_head *seq_head)
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{
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struct name_seq *nseq = kzalloc(sizeof(*nseq), GFP_ATOMIC);
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struct sub_seq *sseq = tipc_subseq_alloc(1);
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if (!nseq || !sseq) {
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pr_warn("Name sequence creation failed, no memory\n");
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kfree(nseq);
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kfree(sseq);
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return NULL;
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}
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spin_lock_init(&nseq->lock);
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nseq->type = type;
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nseq->sseqs = sseq;
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nseq->alloc = 1;
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INIT_HLIST_NODE(&nseq->ns_list);
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INIT_LIST_HEAD(&nseq->subscriptions);
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hlist_add_head_rcu(&nseq->ns_list, seq_head);
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return nseq;
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}
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/**
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* nameseq_find_subseq - find sub-sequence (if any) matching a name instance
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*
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* Very time-critical, so binary searches through sub-sequence array.
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*/
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static struct sub_seq *nameseq_find_subseq(struct name_seq *nseq,
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u32 instance)
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{
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struct sub_seq *sseqs = nseq->sseqs;
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int low = 0;
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int high = nseq->first_free - 1;
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int mid;
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while (low <= high) {
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mid = (low + high) / 2;
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if (instance < sseqs[mid].lower)
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high = mid - 1;
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else if (instance > sseqs[mid].upper)
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low = mid + 1;
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else
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return &sseqs[mid];
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}
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return NULL;
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}
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/**
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* nameseq_locate_subseq - determine position of name instance in sub-sequence
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*
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* Returns index in sub-sequence array of the entry that contains the specified
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* instance value; if no entry contains that value, returns the position
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* where a new entry for it would be inserted in the array.
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*
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* Note: Similar to binary search code for locating a sub-sequence.
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*/
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static u32 nameseq_locate_subseq(struct name_seq *nseq, u32 instance)
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{
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struct sub_seq *sseqs = nseq->sseqs;
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int low = 0;
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int high = nseq->first_free - 1;
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int mid;
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while (low <= high) {
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mid = (low + high) / 2;
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if (instance < sseqs[mid].lower)
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high = mid - 1;
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else if (instance > sseqs[mid].upper)
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low = mid + 1;
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else
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return mid;
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}
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return low;
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}
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/**
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* tipc_nameseq_insert_publ
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*/
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static struct publication *tipc_nameseq_insert_publ(struct net *net,
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struct name_seq *nseq,
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u32 type, u32 lower,
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u32 upper, u32 scope,
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u32 node, u32 port, u32 key)
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{
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struct tipc_subscription *s;
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struct tipc_subscription *st;
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struct publication *publ;
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struct sub_seq *sseq;
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struct name_info *info;
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int created_subseq = 0;
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sseq = nameseq_find_subseq(nseq, lower);
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if (sseq) {
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/* Lower end overlaps existing entry => need an exact match */
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if ((sseq->lower != lower) || (sseq->upper != upper)) {
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return NULL;
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}
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info = sseq->info;
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/* Check if an identical publication already exists */
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list_for_each_entry(publ, &info->zone_list, zone_list) {
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if ((publ->ref == port) && (publ->key == key) &&
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(!publ->node || (publ->node == node)))
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return NULL;
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}
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} else {
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u32 inspos;
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struct sub_seq *freesseq;
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/* Find where lower end should be inserted */
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inspos = nameseq_locate_subseq(nseq, lower);
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/* Fail if upper end overlaps into an existing entry */
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if ((inspos < nseq->first_free) &&
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(upper >= nseq->sseqs[inspos].lower)) {
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return NULL;
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}
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/* Ensure there is space for new sub-sequence */
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if (nseq->first_free == nseq->alloc) {
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struct sub_seq *sseqs = tipc_subseq_alloc(nseq->alloc * 2);
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if (!sseqs) {
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pr_warn("Cannot publish {%u,%u,%u}, no memory\n",
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type, lower, upper);
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return NULL;
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}
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memcpy(sseqs, nseq->sseqs,
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nseq->alloc * sizeof(struct sub_seq));
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kfree(nseq->sseqs);
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nseq->sseqs = sseqs;
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nseq->alloc *= 2;
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}
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info = kzalloc(sizeof(*info), GFP_ATOMIC);
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if (!info) {
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pr_warn("Cannot publish {%u,%u,%u}, no memory\n",
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type, lower, upper);
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return NULL;
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}
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INIT_LIST_HEAD(&info->node_list);
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INIT_LIST_HEAD(&info->cluster_list);
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INIT_LIST_HEAD(&info->zone_list);
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/* Insert new sub-sequence */
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sseq = &nseq->sseqs[inspos];
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freesseq = &nseq->sseqs[nseq->first_free];
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memmove(sseq + 1, sseq, (freesseq - sseq) * sizeof(*sseq));
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memset(sseq, 0, sizeof(*sseq));
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nseq->first_free++;
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sseq->lower = lower;
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sseq->upper = upper;
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sseq->info = info;
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created_subseq = 1;
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}
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/* Insert a publication */
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publ = publ_create(type, lower, upper, scope, node, port, key);
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if (!publ)
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return NULL;
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list_add(&publ->zone_list, &info->zone_list);
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info->zone_list_size++;
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if (in_own_cluster(net, node)) {
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list_add(&publ->cluster_list, &info->cluster_list);
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info->cluster_list_size++;
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}
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if (in_own_node(net, node)) {
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list_add(&publ->node_list, &info->node_list);
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info->node_list_size++;
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}
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/* Any subscriptions waiting for notification? */
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list_for_each_entry_safe(s, st, &nseq->subscriptions, nameseq_list) {
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tipc_subscrp_report_overlap(s, publ->lower, publ->upper,
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TIPC_PUBLISHED, publ->ref,
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publ->node, created_subseq);
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}
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return publ;
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}
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/**
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* tipc_nameseq_remove_publ
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*
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* NOTE: There may be cases where TIPC is asked to remove a publication
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* that is not in the name table. For example, if another node issues a
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* publication for a name sequence that overlaps an existing name sequence
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* the publication will not be recorded, which means the publication won't
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* be found when the name sequence is later withdrawn by that node.
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* A failed withdraw request simply returns a failure indication and lets the
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* caller issue any error or warning messages associated with such a problem.
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*/
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static struct publication *tipc_nameseq_remove_publ(struct net *net,
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struct name_seq *nseq,
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u32 inst, u32 node,
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u32 ref, u32 key)
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{
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struct publication *publ;
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struct sub_seq *sseq = nameseq_find_subseq(nseq, inst);
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struct name_info *info;
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struct sub_seq *free;
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struct tipc_subscription *s, *st;
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int removed_subseq = 0;
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if (!sseq)
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return NULL;
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info = sseq->info;
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/* Locate publication, if it exists */
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list_for_each_entry(publ, &info->zone_list, zone_list) {
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if ((publ->key == key) && (publ->ref == ref) &&
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(!publ->node || (publ->node == node)))
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goto found;
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}
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return NULL;
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found:
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/* Remove publication from zone scope list */
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list_del(&publ->zone_list);
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info->zone_list_size--;
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/* Remove publication from cluster scope list, if present */
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if (in_own_cluster(net, node)) {
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list_del(&publ->cluster_list);
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info->cluster_list_size--;
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}
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/* Remove publication from node scope list, if present */
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if (in_own_node(net, node)) {
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list_del(&publ->node_list);
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info->node_list_size--;
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}
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/* Contract subseq list if no more publications for that subseq */
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if (list_empty(&info->zone_list)) {
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kfree(info);
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free = &nseq->sseqs[nseq->first_free--];
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memmove(sseq, sseq + 1, (free - (sseq + 1)) * sizeof(*sseq));
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removed_subseq = 1;
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}
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/* Notify any waiting subscriptions */
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list_for_each_entry_safe(s, st, &nseq->subscriptions, nameseq_list) {
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tipc_subscrp_report_overlap(s, publ->lower, publ->upper,
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TIPC_WITHDRAWN, publ->ref,
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publ->node, removed_subseq);
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}
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return publ;
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}
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/**
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* tipc_nameseq_subscribe - attach a subscription, and issue
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* the prescribed number of events if there is any sub-
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* sequence overlapping with the requested sequence
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*/
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static void tipc_nameseq_subscribe(struct name_seq *nseq,
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struct tipc_subscription *s)
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{
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struct sub_seq *sseq = nseq->sseqs;
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list_add(&s->nameseq_list, &nseq->subscriptions);
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if (!sseq)
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return;
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while (sseq != &nseq->sseqs[nseq->first_free]) {
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if (tipc_subscrp_check_overlap(s, sseq->lower, sseq->upper)) {
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struct publication *crs;
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struct name_info *info = sseq->info;
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int must_report = 1;
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list_for_each_entry(crs, &info->zone_list, zone_list) {
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tipc_subscrp_report_overlap(s, sseq->lower,
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sseq->upper,
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TIPC_PUBLISHED,
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crs->ref, crs->node,
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must_report);
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must_report = 0;
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}
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}
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sseq++;
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}
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}
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static struct name_seq *nametbl_find_seq(struct net *net, u32 type)
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{
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struct tipc_net *tn = net_generic(net, tipc_net_id);
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struct hlist_head *seq_head;
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struct name_seq *ns;
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seq_head = &tn->nametbl->seq_hlist[hash(type)];
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hlist_for_each_entry_rcu(ns, seq_head, ns_list) {
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if (ns->type == type)
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return ns;
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}
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return NULL;
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};
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struct publication *tipc_nametbl_insert_publ(struct net *net, u32 type,
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u32 lower, u32 upper, u32 scope,
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u32 node, u32 port, u32 key)
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{
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struct tipc_net *tn = net_generic(net, tipc_net_id);
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struct publication *publ;
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struct name_seq *seq = nametbl_find_seq(net, type);
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int index = hash(type);
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if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE) ||
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(lower > upper)) {
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pr_debug("Failed to publish illegal {%u,%u,%u} with scope %u\n",
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type, lower, upper, scope);
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return NULL;
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}
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if (!seq)
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seq = tipc_nameseq_create(type, &tn->nametbl->seq_hlist[index]);
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if (!seq)
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return NULL;
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spin_lock_bh(&seq->lock);
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publ = tipc_nameseq_insert_publ(net, seq, type, lower, upper,
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scope, node, port, key);
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spin_unlock_bh(&seq->lock);
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return publ;
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}
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struct publication *tipc_nametbl_remove_publ(struct net *net, u32 type,
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u32 lower, u32 node, u32 ref,
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u32 key)
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{
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struct publication *publ;
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struct name_seq *seq = nametbl_find_seq(net, type);
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if (!seq)
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return NULL;
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spin_lock_bh(&seq->lock);
|
|
publ = tipc_nameseq_remove_publ(net, seq, lower, node, ref, key);
|
|
if (!seq->first_free && list_empty(&seq->subscriptions)) {
|
|
hlist_del_init_rcu(&seq->ns_list);
|
|
kfree(seq->sseqs);
|
|
spin_unlock_bh(&seq->lock);
|
|
kfree_rcu(seq, rcu);
|
|
return publ;
|
|
}
|
|
spin_unlock_bh(&seq->lock);
|
|
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(struct net *net, u32 type, u32 instance,
|
|
u32 *destnode)
|
|
{
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
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, tn->own_addr))
|
|
return 0;
|
|
|
|
rcu_read_lock();
|
|
seq = nametbl_find_seq(net, type);
|
|
if (unlikely(!seq))
|
|
goto not_found;
|
|
spin_lock_bh(&seq->lock);
|
|
sseq = nameseq_find_subseq(seq, instance);
|
|
if (unlikely(!sseq))
|
|
goto no_match;
|
|
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 == tn->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(net, *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:
|
|
rcu_read_unlock();
|
|
*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(struct net *net, u32 type, u32 lower, u32 upper,
|
|
u32 limit, struct tipc_plist *dports)
|
|
{
|
|
struct name_seq *seq;
|
|
struct sub_seq *sseq;
|
|
struct sub_seq *sseq_stop;
|
|
struct name_info *info;
|
|
int res = 0;
|
|
|
|
rcu_read_lock();
|
|
seq = nametbl_find_seq(net, 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_plist_push(dports, publ->ref);
|
|
}
|
|
|
|
if (info->cluster_list_size != info->node_list_size)
|
|
res = 1;
|
|
}
|
|
spin_unlock_bh(&seq->lock);
|
|
exit:
|
|
rcu_read_unlock();
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* tipc_nametbl_publish - add name publication to network name tables
|
|
*/
|
|
struct publication *tipc_nametbl_publish(struct net *net, u32 type, u32 lower,
|
|
u32 upper, u32 scope, u32 port_ref,
|
|
u32 key)
|
|
{
|
|
struct publication *publ;
|
|
struct sk_buff *buf = NULL;
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
|
|
spin_lock_bh(&tn->nametbl_lock);
|
|
if (tn->nametbl->local_publ_count >= TIPC_MAX_PUBLICATIONS) {
|
|
pr_warn("Publication failed, local publication limit reached (%u)\n",
|
|
TIPC_MAX_PUBLICATIONS);
|
|
spin_unlock_bh(&tn->nametbl_lock);
|
|
return NULL;
|
|
}
|
|
|
|
publ = tipc_nametbl_insert_publ(net, type, lower, upper, scope,
|
|
tn->own_addr, port_ref, key);
|
|
if (likely(publ)) {
|
|
tn->nametbl->local_publ_count++;
|
|
buf = tipc_named_publish(net, publ);
|
|
/* Any pending external events? */
|
|
tipc_named_process_backlog(net);
|
|
}
|
|
spin_unlock_bh(&tn->nametbl_lock);
|
|
|
|
if (buf)
|
|
tipc_node_broadcast(net, buf);
|
|
return publ;
|
|
}
|
|
|
|
/**
|
|
* tipc_nametbl_withdraw - withdraw name publication from network name tables
|
|
*/
|
|
int tipc_nametbl_withdraw(struct net *net, u32 type, u32 lower, u32 ref,
|
|
u32 key)
|
|
{
|
|
struct publication *publ;
|
|
struct sk_buff *skb = NULL;
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
|
|
spin_lock_bh(&tn->nametbl_lock);
|
|
publ = tipc_nametbl_remove_publ(net, type, lower, tn->own_addr,
|
|
ref, key);
|
|
if (likely(publ)) {
|
|
tn->nametbl->local_publ_count--;
|
|
skb = tipc_named_withdraw(net, publ);
|
|
/* Any pending external events? */
|
|
tipc_named_process_backlog(net);
|
|
list_del_init(&publ->pport_list);
|
|
kfree_rcu(publ, rcu);
|
|
} else {
|
|
pr_err("Unable to remove local publication\n"
|
|
"(type=%u, lower=%u, ref=%u, key=%u)\n",
|
|
type, lower, ref, key);
|
|
}
|
|
spin_unlock_bh(&tn->nametbl_lock);
|
|
|
|
if (skb) {
|
|
tipc_node_broadcast(net, skb);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tipc_nametbl_subscribe - add a subscription object to the name table
|
|
*/
|
|
void tipc_nametbl_subscribe(struct tipc_subscription *s)
|
|
{
|
|
struct tipc_net *tn = net_generic(s->net, tipc_net_id);
|
|
u32 type = s->seq.type;
|
|
int index = hash(type);
|
|
struct name_seq *seq;
|
|
|
|
spin_lock_bh(&tn->nametbl_lock);
|
|
seq = nametbl_find_seq(s->net, type);
|
|
if (!seq)
|
|
seq = tipc_nameseq_create(type, &tn->nametbl->seq_hlist[index]);
|
|
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);
|
|
}
|
|
spin_unlock_bh(&tn->nametbl_lock);
|
|
}
|
|
|
|
/**
|
|
* tipc_nametbl_unsubscribe - remove a subscription object from name table
|
|
*/
|
|
void tipc_nametbl_unsubscribe(struct tipc_subscription *s)
|
|
{
|
|
struct tipc_net *tn = net_generic(s->net, tipc_net_id);
|
|
struct name_seq *seq;
|
|
|
|
spin_lock_bh(&tn->nametbl_lock);
|
|
seq = nametbl_find_seq(s->net, s->seq.type);
|
|
if (seq != NULL) {
|
|
spin_lock_bh(&seq->lock);
|
|
list_del_init(&s->nameseq_list);
|
|
if (!seq->first_free && list_empty(&seq->subscriptions)) {
|
|
hlist_del_init_rcu(&seq->ns_list);
|
|
kfree(seq->sseqs);
|
|
spin_unlock_bh(&seq->lock);
|
|
kfree_rcu(seq, rcu);
|
|
} else {
|
|
spin_unlock_bh(&seq->lock);
|
|
}
|
|
}
|
|
spin_unlock_bh(&tn->nametbl_lock);
|
|
}
|
|
|
|
int tipc_nametbl_init(struct net *net)
|
|
{
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
struct name_table *tipc_nametbl;
|
|
int i;
|
|
|
|
tipc_nametbl = kzalloc(sizeof(*tipc_nametbl), GFP_ATOMIC);
|
|
if (!tipc_nametbl)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < TIPC_NAMETBL_SIZE; i++)
|
|
INIT_HLIST_HEAD(&tipc_nametbl->seq_hlist[i]);
|
|
|
|
INIT_LIST_HEAD(&tipc_nametbl->publ_list[TIPC_ZONE_SCOPE]);
|
|
INIT_LIST_HEAD(&tipc_nametbl->publ_list[TIPC_CLUSTER_SCOPE]);
|
|
INIT_LIST_HEAD(&tipc_nametbl->publ_list[TIPC_NODE_SCOPE]);
|
|
tn->nametbl = tipc_nametbl;
|
|
spin_lock_init(&tn->nametbl_lock);
|
|
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 net *net, struct name_seq *seq)
|
|
{
|
|
struct publication *publ, *safe;
|
|
struct sub_seq *sseq;
|
|
struct name_info *info;
|
|
|
|
spin_lock_bh(&seq->lock);
|
|
sseq = seq->sseqs;
|
|
info = sseq->info;
|
|
list_for_each_entry_safe(publ, safe, &info->zone_list, zone_list) {
|
|
tipc_nameseq_remove_publ(net, seq, publ->lower, publ->node,
|
|
publ->ref, publ->key);
|
|
kfree_rcu(publ, rcu);
|
|
}
|
|
hlist_del_init_rcu(&seq->ns_list);
|
|
kfree(seq->sseqs);
|
|
spin_unlock_bh(&seq->lock);
|
|
|
|
kfree_rcu(seq, rcu);
|
|
}
|
|
|
|
void tipc_nametbl_stop(struct net *net)
|
|
{
|
|
u32 i;
|
|
struct name_seq *seq;
|
|
struct hlist_head *seq_head;
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
struct name_table *tipc_nametbl = tn->nametbl;
|
|
|
|
/* Verify name table is empty and purge any lingering
|
|
* publications, then release the name table
|
|
*/
|
|
spin_lock_bh(&tn->nametbl_lock);
|
|
for (i = 0; i < TIPC_NAMETBL_SIZE; i++) {
|
|
if (hlist_empty(&tipc_nametbl->seq_hlist[i]))
|
|
continue;
|
|
seq_head = &tipc_nametbl->seq_hlist[i];
|
|
hlist_for_each_entry_rcu(seq, seq_head, ns_list) {
|
|
tipc_purge_publications(net, seq);
|
|
}
|
|
}
|
|
spin_unlock_bh(&tn->nametbl_lock);
|
|
|
|
synchronize_net();
|
|
kfree(tipc_nametbl);
|
|
|
|
}
|
|
|
|
static int __tipc_nl_add_nametable_publ(struct tipc_nl_msg *msg,
|
|
struct name_seq *seq,
|
|
struct sub_seq *sseq, u32 *last_publ)
|
|
{
|
|
void *hdr;
|
|
struct nlattr *attrs;
|
|
struct nlattr *publ;
|
|
struct publication *p;
|
|
|
|
if (*last_publ) {
|
|
list_for_each_entry(p, &sseq->info->zone_list, zone_list)
|
|
if (p->key == *last_publ)
|
|
break;
|
|
if (p->key != *last_publ)
|
|
return -EPIPE;
|
|
} else {
|
|
p = list_first_entry(&sseq->info->zone_list, struct publication,
|
|
zone_list);
|
|
}
|
|
|
|
list_for_each_entry_from(p, &sseq->info->zone_list, zone_list) {
|
|
*last_publ = p->key;
|
|
|
|
hdr = genlmsg_put(msg->skb, msg->portid, msg->seq,
|
|
&tipc_genl_family, NLM_F_MULTI,
|
|
TIPC_NL_NAME_TABLE_GET);
|
|
if (!hdr)
|
|
return -EMSGSIZE;
|
|
|
|
attrs = nla_nest_start(msg->skb, TIPC_NLA_NAME_TABLE);
|
|
if (!attrs)
|
|
goto msg_full;
|
|
|
|
publ = nla_nest_start(msg->skb, TIPC_NLA_NAME_TABLE_PUBL);
|
|
if (!publ)
|
|
goto attr_msg_full;
|
|
|
|
if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_TYPE, seq->type))
|
|
goto publ_msg_full;
|
|
if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_LOWER, sseq->lower))
|
|
goto publ_msg_full;
|
|
if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_UPPER, sseq->upper))
|
|
goto publ_msg_full;
|
|
if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_SCOPE, p->scope))
|
|
goto publ_msg_full;
|
|
if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_NODE, p->node))
|
|
goto publ_msg_full;
|
|
if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_REF, p->ref))
|
|
goto publ_msg_full;
|
|
if (nla_put_u32(msg->skb, TIPC_NLA_PUBL_KEY, p->key))
|
|
goto publ_msg_full;
|
|
|
|
nla_nest_end(msg->skb, publ);
|
|
nla_nest_end(msg->skb, attrs);
|
|
genlmsg_end(msg->skb, hdr);
|
|
}
|
|
*last_publ = 0;
|
|
|
|
return 0;
|
|
|
|
publ_msg_full:
|
|
nla_nest_cancel(msg->skb, publ);
|
|
attr_msg_full:
|
|
nla_nest_cancel(msg->skb, attrs);
|
|
msg_full:
|
|
genlmsg_cancel(msg->skb, hdr);
|
|
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int __tipc_nl_subseq_list(struct tipc_nl_msg *msg, struct name_seq *seq,
|
|
u32 *last_lower, u32 *last_publ)
|
|
{
|
|
struct sub_seq *sseq;
|
|
struct sub_seq *sseq_start;
|
|
int err;
|
|
|
|
if (*last_lower) {
|
|
sseq_start = nameseq_find_subseq(seq, *last_lower);
|
|
if (!sseq_start)
|
|
return -EPIPE;
|
|
} else {
|
|
sseq_start = seq->sseqs;
|
|
}
|
|
|
|
for (sseq = sseq_start; sseq != &seq->sseqs[seq->first_free]; sseq++) {
|
|
err = __tipc_nl_add_nametable_publ(msg, seq, sseq, last_publ);
|
|
if (err) {
|
|
*last_lower = sseq->lower;
|
|
return err;
|
|
}
|
|
}
|
|
*last_lower = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tipc_nl_seq_list(struct net *net, struct tipc_nl_msg *msg,
|
|
u32 *last_type, u32 *last_lower, u32 *last_publ)
|
|
{
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
struct hlist_head *seq_head;
|
|
struct name_seq *seq = NULL;
|
|
int err;
|
|
int i;
|
|
|
|
if (*last_type)
|
|
i = hash(*last_type);
|
|
else
|
|
i = 0;
|
|
|
|
for (; i < TIPC_NAMETBL_SIZE; i++) {
|
|
seq_head = &tn->nametbl->seq_hlist[i];
|
|
|
|
if (*last_type) {
|
|
seq = nametbl_find_seq(net, *last_type);
|
|
if (!seq)
|
|
return -EPIPE;
|
|
} else {
|
|
hlist_for_each_entry_rcu(seq, seq_head, ns_list)
|
|
break;
|
|
if (!seq)
|
|
continue;
|
|
}
|
|
|
|
hlist_for_each_entry_from_rcu(seq, ns_list) {
|
|
spin_lock_bh(&seq->lock);
|
|
err = __tipc_nl_subseq_list(msg, seq, last_lower,
|
|
last_publ);
|
|
|
|
if (err) {
|
|
*last_type = seq->type;
|
|
spin_unlock_bh(&seq->lock);
|
|
return err;
|
|
}
|
|
spin_unlock_bh(&seq->lock);
|
|
}
|
|
*last_type = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int tipc_nl_name_table_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
int err;
|
|
int done = cb->args[3];
|
|
u32 last_type = cb->args[0];
|
|
u32 last_lower = cb->args[1];
|
|
u32 last_publ = cb->args[2];
|
|
struct net *net = sock_net(skb->sk);
|
|
struct tipc_nl_msg msg;
|
|
|
|
if (done)
|
|
return 0;
|
|
|
|
msg.skb = skb;
|
|
msg.portid = NETLINK_CB(cb->skb).portid;
|
|
msg.seq = cb->nlh->nlmsg_seq;
|
|
|
|
rcu_read_lock();
|
|
err = tipc_nl_seq_list(net, &msg, &last_type, &last_lower, &last_publ);
|
|
if (!err) {
|
|
done = 1;
|
|
} else if (err != -EMSGSIZE) {
|
|
/* We never set seq or call nl_dump_check_consistent() this
|
|
* means that setting prev_seq here will cause the consistence
|
|
* check to fail in the netlink callback handler. Resulting in
|
|
* the NLMSG_DONE message having the NLM_F_DUMP_INTR flag set if
|
|
* we got an error.
|
|
*/
|
|
cb->prev_seq = 1;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
cb->args[0] = last_type;
|
|
cb->args[1] = last_lower;
|
|
cb->args[2] = last_publ;
|
|
cb->args[3] = done;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
void tipc_plist_push(struct tipc_plist *pl, u32 port)
|
|
{
|
|
struct tipc_plist *nl;
|
|
|
|
if (likely(!pl->port)) {
|
|
pl->port = port;
|
|
return;
|
|
}
|
|
if (pl->port == port)
|
|
return;
|
|
list_for_each_entry(nl, &pl->list, list) {
|
|
if (nl->port == port)
|
|
return;
|
|
}
|
|
nl = kmalloc(sizeof(*nl), GFP_ATOMIC);
|
|
if (nl) {
|
|
nl->port = port;
|
|
list_add(&nl->list, &pl->list);
|
|
}
|
|
}
|
|
|
|
u32 tipc_plist_pop(struct tipc_plist *pl)
|
|
{
|
|
struct tipc_plist *nl;
|
|
u32 port = 0;
|
|
|
|
if (likely(list_empty(&pl->list))) {
|
|
port = pl->port;
|
|
pl->port = 0;
|
|
return port;
|
|
}
|
|
nl = list_first_entry(&pl->list, typeof(*nl), list);
|
|
port = nl->port;
|
|
list_del(&nl->list);
|
|
kfree(nl);
|
|
return port;
|
|
}
|