forked from mirrors/linux
6c36b5c244
tipc_exit_net() is very slow and is abused by syzbot. tipc_nametbl_stop() is called for each netns being dismantled. Calling synchronize_net() right before freeing tn->nametbl is a big hammer. Replace this with kfree_rcu(). Note that RCU is not properly used here, otherwise tn->nametbl should be cleared before the synchronize_net() or kfree_rcu(), or even before the cleanup loop. We might need to fix this at some point. Also note tipc uses other synchronize_rcu() calls, more work is needed to make tipc_exit_net() much faster. List of remaining calls to synchronize_rcu() tipc_detach_loopback() (dev_remove_pack()) tipc_bcast_stop() tipc_sk_rht_destroy() Signed-off-by: Eric Dumazet <edumazet@google.com> Link: https://patch.msgid.link/20241204210234.319484-1-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
157 lines
6.5 KiB
C
157 lines
6.5 KiB
C
/*
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* net/tipc/name_table.h: Include file for TIPC name table code
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*
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* Copyright (c) 2000-2006, 2014-2018, Ericsson AB
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* Copyright (c) 2004-2005, 2010-2011, Wind River Systems
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* Copyright (c) 2020-2021, Red Hat Inc
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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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#ifndef _TIPC_NAME_TABLE_H
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#define _TIPC_NAME_TABLE_H
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struct tipc_subscription;
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struct tipc_plist;
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struct tipc_nlist;
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struct tipc_group;
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struct tipc_uaddr;
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/*
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* TIPC name types reserved for internal TIPC use (both current and planned)
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*/
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#define TIPC_ZM_SRV 3 /* zone master service name type */
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#define TIPC_PUBL_SCOPE_NUM (TIPC_NODE_SCOPE + 1)
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#define TIPC_NAMETBL_SIZE 1024 /* must be a power of 2 */
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#define TIPC_ANY_SCOPE 10 /* Both node and cluster scope will match */
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/**
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* struct publication - info about a published service address or range
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* @sr: service range represented by this publication
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* @sk: address of socket bound to this publication
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* @scope: scope of publication, TIPC_NODE_SCOPE or TIPC_CLUSTER_SCOPE
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* @key: publication key, unique across the cluster
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* @id: publication id
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* @binding_node: all publications from the same node which bound this one
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* - Remote publications: in node->publ_list;
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* Used by node/name distr to withdraw publications when node is lost
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* - Local/node scope publications: in name_table->node_scope list
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* - Local/cluster scope publications: in name_table->cluster_scope list
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* @binding_sock: all publications from the same socket which bound this one
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* Used by socket to withdraw publications when socket is unbound/released
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* @local_publ: list of identical publications made from this node
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* Used by closest_first and multicast receive lookup algorithms
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* @all_publ: all publications identical to this one, whatever node and scope
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* Used by round-robin lookup algorithm
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* @list: to form a list of publications in temporal order
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* @rcu: RCU callback head used for deferred freeing
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*/
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struct publication {
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struct tipc_service_range sr;
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struct tipc_socket_addr sk;
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u16 scope;
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u32 key;
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u32 id;
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struct list_head binding_node;
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struct list_head binding_sock;
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struct list_head local_publ;
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struct list_head all_publ;
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struct list_head list;
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struct rcu_head rcu;
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};
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/**
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* struct name_table - table containing all existing port name publications
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* @rcu: RCU callback head used for deferred freeing
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* @services: name sequence hash lists
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* @node_scope: all local publications with node scope
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* - used by name_distr during re-init of name table
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* @cluster_scope: all local publications with cluster scope
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* - used by name_distr to send bulk updates to new nodes
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* - used by name_distr during re-init of name table
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* @cluster_scope_lock: lock for accessing @cluster_scope
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* @local_publ_count: number of publications issued by this node
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* @rc_dests: destination node counter
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* @snd_nxt: next sequence number to be used
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*/
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struct name_table {
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struct rcu_head rcu;
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struct hlist_head services[TIPC_NAMETBL_SIZE];
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struct list_head node_scope;
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struct list_head cluster_scope;
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rwlock_t cluster_scope_lock;
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u32 local_publ_count;
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u32 rc_dests;
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u32 snd_nxt;
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};
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int tipc_nl_name_table_dump(struct sk_buff *skb, struct netlink_callback *cb);
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bool tipc_nametbl_lookup_anycast(struct net *net, struct tipc_uaddr *ua,
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struct tipc_socket_addr *sk);
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void tipc_nametbl_lookup_mcast_sockets(struct net *net, struct tipc_uaddr *ua,
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struct list_head *dports);
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void tipc_nametbl_lookup_mcast_nodes(struct net *net, struct tipc_uaddr *ua,
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struct tipc_nlist *nodes);
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bool tipc_nametbl_lookup_group(struct net *net, struct tipc_uaddr *ua,
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struct list_head *dsts, int *dstcnt,
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u32 exclude, bool mcast);
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void tipc_nametbl_build_group(struct net *net, struct tipc_group *grp,
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struct tipc_uaddr *ua);
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struct publication *tipc_nametbl_publish(struct net *net, struct tipc_uaddr *ua,
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struct tipc_socket_addr *sk, u32 key);
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void tipc_nametbl_withdraw(struct net *net, struct tipc_uaddr *ua,
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struct tipc_socket_addr *sk, u32 key);
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struct publication *tipc_nametbl_insert_publ(struct net *net,
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struct tipc_uaddr *ua,
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struct tipc_socket_addr *sk,
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u32 key);
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struct publication *tipc_nametbl_remove_publ(struct net *net,
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struct tipc_uaddr *ua,
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struct tipc_socket_addr *sk,
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u32 key);
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bool tipc_nametbl_subscribe(struct tipc_subscription *s);
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void tipc_nametbl_unsubscribe(struct tipc_subscription *s);
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int tipc_nametbl_init(struct net *net);
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void tipc_nametbl_stop(struct net *net);
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struct tipc_dest {
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struct list_head list;
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u32 port;
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u32 node;
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};
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struct tipc_dest *tipc_dest_find(struct list_head *l, u32 node, u32 port);
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bool tipc_dest_push(struct list_head *l, u32 node, u32 port);
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bool tipc_dest_pop(struct list_head *l, u32 *node, u32 *port);
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bool tipc_dest_del(struct list_head *l, u32 node, u32 port);
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void tipc_dest_list_purge(struct list_head *l);
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#endif
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