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![Wu Fengguang](/assets/img/avatar_default.png)
TO: "David S. Miller" <davem@davemloft.net> CC: netdev@vger.kernel.org CC: Jon Maloy <jon.maloy@ericsson.com> CC: Ying Xue <ying.xue@windriver.com> CC: tipc-discussion@lists.sourceforge.net CC: linux-kernel@vger.kernel.org Signed-off-by: Fengguang Wu <fengguang.wu@intel.com> Acked-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1404 lines
36 KiB
C
1404 lines
36 KiB
C
/*
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* net/tipc/node.c: TIPC node management routines
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*
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* Copyright (c) 2000-2006, 2012-2015, Ericsson AB
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* Copyright (c) 2005-2006, 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 "core.h"
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#include "link.h"
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#include "node.h"
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#include "name_distr.h"
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#include "socket.h"
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#include "bcast.h"
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#include "discover.h"
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/* Node FSM states and events:
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*/
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enum {
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SELF_DOWN_PEER_DOWN = 0xdd,
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SELF_UP_PEER_UP = 0xaa,
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SELF_DOWN_PEER_LEAVING = 0xd1,
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SELF_UP_PEER_COMING = 0xac,
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SELF_COMING_PEER_UP = 0xca,
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SELF_LEAVING_PEER_DOWN = 0x1d,
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NODE_FAILINGOVER = 0xf0,
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NODE_SYNCHING = 0xcc
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};
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enum {
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SELF_ESTABL_CONTACT_EVT = 0xece,
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SELF_LOST_CONTACT_EVT = 0x1ce,
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PEER_ESTABL_CONTACT_EVT = 0x9ece,
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PEER_LOST_CONTACT_EVT = 0x91ce,
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NODE_FAILOVER_BEGIN_EVT = 0xfbe,
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NODE_FAILOVER_END_EVT = 0xfee,
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NODE_SYNCH_BEGIN_EVT = 0xcbe,
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NODE_SYNCH_END_EVT = 0xcee
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};
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static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
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struct sk_buff_head *xmitq,
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struct tipc_media_addr **maddr);
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static void tipc_node_link_down(struct tipc_node *n, int bearer_id,
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bool delete);
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static void node_lost_contact(struct tipc_node *n, struct sk_buff_head *inputq);
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static void tipc_node_delete(struct tipc_node *node);
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static void tipc_node_timeout(unsigned long data);
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static void tipc_node_fsm_evt(struct tipc_node *n, int evt);
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struct tipc_sock_conn {
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u32 port;
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u32 peer_port;
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u32 peer_node;
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struct list_head list;
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};
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static const struct nla_policy tipc_nl_node_policy[TIPC_NLA_NODE_MAX + 1] = {
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[TIPC_NLA_NODE_UNSPEC] = { .type = NLA_UNSPEC },
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[TIPC_NLA_NODE_ADDR] = { .type = NLA_U32 },
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[TIPC_NLA_NODE_UP] = { .type = NLA_FLAG }
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};
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/*
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* A trivial power-of-two bitmask technique is used for speed, since this
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* operation is done for every incoming TIPC packet. The number of hash table
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* entries has been chosen so that no hash chain exceeds 8 nodes and will
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* usually be much smaller (typically only a single node).
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*/
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static unsigned int tipc_hashfn(u32 addr)
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{
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return addr & (NODE_HTABLE_SIZE - 1);
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}
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static void tipc_node_kref_release(struct kref *kref)
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{
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struct tipc_node *node = container_of(kref, struct tipc_node, kref);
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tipc_node_delete(node);
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}
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void tipc_node_put(struct tipc_node *node)
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{
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kref_put(&node->kref, tipc_node_kref_release);
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}
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static void tipc_node_get(struct tipc_node *node)
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{
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kref_get(&node->kref);
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}
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/*
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* tipc_node_find - locate specified node object, if it exists
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*/
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struct tipc_node *tipc_node_find(struct net *net, u32 addr)
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{
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struct tipc_net *tn = net_generic(net, tipc_net_id);
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struct tipc_node *node;
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if (unlikely(!in_own_cluster_exact(net, addr)))
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return NULL;
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rcu_read_lock();
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hlist_for_each_entry_rcu(node, &tn->node_htable[tipc_hashfn(addr)],
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hash) {
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if (node->addr == addr) {
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tipc_node_get(node);
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rcu_read_unlock();
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return node;
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}
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}
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rcu_read_unlock();
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return NULL;
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}
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struct tipc_node *tipc_node_create(struct net *net, u32 addr, u16 capabilities)
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{
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struct tipc_net *tn = net_generic(net, tipc_net_id);
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struct tipc_node *n_ptr, *temp_node;
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spin_lock_bh(&tn->node_list_lock);
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n_ptr = tipc_node_find(net, addr);
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if (n_ptr)
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goto exit;
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n_ptr = kzalloc(sizeof(*n_ptr), GFP_ATOMIC);
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if (!n_ptr) {
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pr_warn("Node creation failed, no memory\n");
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goto exit;
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}
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n_ptr->addr = addr;
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n_ptr->net = net;
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n_ptr->capabilities = capabilities;
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kref_init(&n_ptr->kref);
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spin_lock_init(&n_ptr->lock);
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INIT_HLIST_NODE(&n_ptr->hash);
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INIT_LIST_HEAD(&n_ptr->list);
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INIT_LIST_HEAD(&n_ptr->publ_list);
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INIT_LIST_HEAD(&n_ptr->conn_sks);
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skb_queue_head_init(&n_ptr->bc_entry.namedq);
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skb_queue_head_init(&n_ptr->bc_entry.inputq1);
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__skb_queue_head_init(&n_ptr->bc_entry.arrvq);
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skb_queue_head_init(&n_ptr->bc_entry.inputq2);
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hlist_add_head_rcu(&n_ptr->hash, &tn->node_htable[tipc_hashfn(addr)]);
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list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
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if (n_ptr->addr < temp_node->addr)
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break;
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}
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list_add_tail_rcu(&n_ptr->list, &temp_node->list);
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n_ptr->state = SELF_DOWN_PEER_LEAVING;
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n_ptr->signature = INVALID_NODE_SIG;
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n_ptr->active_links[0] = INVALID_BEARER_ID;
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n_ptr->active_links[1] = INVALID_BEARER_ID;
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if (!tipc_link_bc_create(net, tipc_own_addr(net), n_ptr->addr,
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U16_MAX, tipc_bc_sndlink(net)->window,
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n_ptr->capabilities,
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&n_ptr->bc_entry.inputq1,
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&n_ptr->bc_entry.namedq,
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tipc_bc_sndlink(net),
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&n_ptr->bc_entry.link)) {
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pr_warn("Broadcast rcv link creation failed, no memory\n");
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kfree(n_ptr);
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n_ptr = NULL;
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goto exit;
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}
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tipc_node_get(n_ptr);
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setup_timer(&n_ptr->timer, tipc_node_timeout, (unsigned long)n_ptr);
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n_ptr->keepalive_intv = U32_MAX;
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exit:
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spin_unlock_bh(&tn->node_list_lock);
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return n_ptr;
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}
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static void tipc_node_calculate_timer(struct tipc_node *n, struct tipc_link *l)
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{
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unsigned long tol = l->tolerance;
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unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4;
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unsigned long keepalive_intv = msecs_to_jiffies(intv);
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/* Link with lowest tolerance determines timer interval */
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if (keepalive_intv < n->keepalive_intv)
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n->keepalive_intv = keepalive_intv;
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/* Ensure link's abort limit corresponds to current interval */
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l->abort_limit = l->tolerance / jiffies_to_msecs(n->keepalive_intv);
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}
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static void tipc_node_delete(struct tipc_node *node)
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{
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list_del_rcu(&node->list);
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hlist_del_rcu(&node->hash);
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kfree(node->bc_entry.link);
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kfree_rcu(node, rcu);
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}
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void tipc_node_stop(struct net *net)
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{
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struct tipc_net *tn = net_generic(net, tipc_net_id);
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struct tipc_node *node, *t_node;
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spin_lock_bh(&tn->node_list_lock);
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list_for_each_entry_safe(node, t_node, &tn->node_list, list) {
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if (del_timer(&node->timer))
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tipc_node_put(node);
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tipc_node_put(node);
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}
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spin_unlock_bh(&tn->node_list_lock);
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}
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int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port)
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{
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struct tipc_node *node;
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struct tipc_sock_conn *conn;
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int err = 0;
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if (in_own_node(net, dnode))
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return 0;
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node = tipc_node_find(net, dnode);
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if (!node) {
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pr_warn("Connecting sock to node 0x%x failed\n", dnode);
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return -EHOSTUNREACH;
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}
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conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
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if (!conn) {
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err = -EHOSTUNREACH;
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goto exit;
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}
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conn->peer_node = dnode;
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conn->port = port;
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conn->peer_port = peer_port;
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tipc_node_lock(node);
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list_add_tail(&conn->list, &node->conn_sks);
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tipc_node_unlock(node);
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exit:
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tipc_node_put(node);
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return err;
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}
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void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port)
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{
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struct tipc_node *node;
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struct tipc_sock_conn *conn, *safe;
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if (in_own_node(net, dnode))
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return;
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node = tipc_node_find(net, dnode);
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if (!node)
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return;
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tipc_node_lock(node);
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list_for_each_entry_safe(conn, safe, &node->conn_sks, list) {
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if (port != conn->port)
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continue;
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list_del(&conn->list);
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kfree(conn);
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}
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tipc_node_unlock(node);
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tipc_node_put(node);
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}
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/* tipc_node_timeout - handle expiration of node timer
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*/
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static void tipc_node_timeout(unsigned long data)
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{
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struct tipc_node *n = (struct tipc_node *)data;
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struct tipc_link_entry *le;
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struct sk_buff_head xmitq;
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int bearer_id;
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int rc = 0;
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__skb_queue_head_init(&xmitq);
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for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) {
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tipc_node_lock(n);
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le = &n->links[bearer_id];
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if (le->link) {
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/* Link tolerance may change asynchronously: */
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tipc_node_calculate_timer(n, le->link);
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rc = tipc_link_timeout(le->link, &xmitq);
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}
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tipc_node_unlock(n);
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tipc_bearer_xmit(n->net, bearer_id, &xmitq, &le->maddr);
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if (rc & TIPC_LINK_DOWN_EVT)
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tipc_node_link_down(n, bearer_id, false);
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}
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if (!mod_timer(&n->timer, jiffies + n->keepalive_intv))
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tipc_node_get(n);
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tipc_node_put(n);
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}
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/**
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* __tipc_node_link_up - handle addition of link
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* Node lock must be held by caller
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* Link becomes active (alone or shared) or standby, depending on its priority.
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*/
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static void __tipc_node_link_up(struct tipc_node *n, int bearer_id,
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struct sk_buff_head *xmitq)
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{
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int *slot0 = &n->active_links[0];
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int *slot1 = &n->active_links[1];
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struct tipc_link *ol = node_active_link(n, 0);
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struct tipc_link *nl = n->links[bearer_id].link;
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if (!nl)
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return;
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tipc_link_fsm_evt(nl, LINK_ESTABLISH_EVT);
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if (!tipc_link_is_up(nl))
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return;
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n->working_links++;
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n->action_flags |= TIPC_NOTIFY_LINK_UP;
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n->link_id = nl->peer_bearer_id << 16 | bearer_id;
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/* Leave room for tunnel header when returning 'mtu' to users: */
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n->links[bearer_id].mtu = nl->mtu - INT_H_SIZE;
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tipc_bearer_add_dest(n->net, bearer_id, n->addr);
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tipc_bcast_inc_bearer_dst_cnt(n->net, bearer_id);
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pr_debug("Established link <%s> on network plane %c\n",
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nl->name, nl->net_plane);
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/* First link? => give it both slots */
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if (!ol) {
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*slot0 = bearer_id;
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*slot1 = bearer_id;
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tipc_node_fsm_evt(n, SELF_ESTABL_CONTACT_EVT);
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n->action_flags |= TIPC_NOTIFY_NODE_UP;
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tipc_bcast_add_peer(n->net, nl, xmitq);
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return;
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}
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/* Second link => redistribute slots */
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if (nl->priority > ol->priority) {
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pr_debug("Old link <%s> becomes standby\n", ol->name);
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*slot0 = bearer_id;
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*slot1 = bearer_id;
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tipc_link_set_active(nl, true);
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tipc_link_set_active(ol, false);
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} else if (nl->priority == ol->priority) {
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tipc_link_set_active(nl, true);
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*slot1 = bearer_id;
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} else {
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pr_debug("New link <%s> is standby\n", nl->name);
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}
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|
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/* Prepare synchronization with first link */
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tipc_link_tnl_prepare(ol, nl, SYNCH_MSG, xmitq);
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}
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|
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/**
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* tipc_node_link_up - handle addition of link
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*
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* Link becomes active (alone or shared) or standby, depending on its priority.
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*/
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static void tipc_node_link_up(struct tipc_node *n, int bearer_id,
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struct sk_buff_head *xmitq)
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{
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tipc_node_lock(n);
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__tipc_node_link_up(n, bearer_id, xmitq);
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tipc_node_unlock(n);
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}
|
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|
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/**
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* __tipc_node_link_down - handle loss of link
|
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*/
|
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static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
|
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struct sk_buff_head *xmitq,
|
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struct tipc_media_addr **maddr)
|
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{
|
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struct tipc_link_entry *le = &n->links[*bearer_id];
|
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int *slot0 = &n->active_links[0];
|
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int *slot1 = &n->active_links[1];
|
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int i, highest = 0;
|
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struct tipc_link *l, *_l, *tnl;
|
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|
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l = n->links[*bearer_id].link;
|
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if (!l || tipc_link_is_reset(l))
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return;
|
|
|
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n->working_links--;
|
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n->action_flags |= TIPC_NOTIFY_LINK_DOWN;
|
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n->link_id = l->peer_bearer_id << 16 | *bearer_id;
|
|
|
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tipc_bearer_remove_dest(n->net, *bearer_id, n->addr);
|
|
|
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pr_debug("Lost link <%s> on network plane %c\n",
|
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l->name, l->net_plane);
|
|
|
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/* Select new active link if any available */
|
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*slot0 = INVALID_BEARER_ID;
|
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*slot1 = INVALID_BEARER_ID;
|
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for (i = 0; i < MAX_BEARERS; i++) {
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_l = n->links[i].link;
|
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if (!_l || !tipc_link_is_up(_l))
|
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continue;
|
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if (_l == l)
|
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continue;
|
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if (_l->priority < highest)
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continue;
|
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if (_l->priority > highest) {
|
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highest = _l->priority;
|
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*slot0 = i;
|
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*slot1 = i;
|
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continue;
|
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}
|
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*slot1 = i;
|
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}
|
|
|
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if (!tipc_node_is_up(n)) {
|
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if (tipc_link_peer_is_down(l))
|
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tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
|
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tipc_node_fsm_evt(n, SELF_LOST_CONTACT_EVT);
|
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tipc_link_fsm_evt(l, LINK_RESET_EVT);
|
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tipc_link_reset(l);
|
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tipc_link_build_reset_msg(l, xmitq);
|
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*maddr = &n->links[*bearer_id].maddr;
|
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node_lost_contact(n, &le->inputq);
|
|
tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
|
|
return;
|
|
}
|
|
tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
|
|
|
|
/* There is still a working link => initiate failover */
|
|
tnl = node_active_link(n, 0);
|
|
tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
|
|
tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
|
|
n->sync_point = tnl->rcv_nxt + (U16_MAX / 2 - 1);
|
|
tipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, xmitq);
|
|
tipc_link_reset(l);
|
|
tipc_link_fsm_evt(l, LINK_RESET_EVT);
|
|
tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
|
|
tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
|
|
*maddr = &n->links[tnl->bearer_id].maddr;
|
|
*bearer_id = tnl->bearer_id;
|
|
}
|
|
|
|
static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete)
|
|
{
|
|
struct tipc_link_entry *le = &n->links[bearer_id];
|
|
struct tipc_link *l = le->link;
|
|
struct tipc_media_addr *maddr;
|
|
struct sk_buff_head xmitq;
|
|
|
|
if (!l)
|
|
return;
|
|
|
|
__skb_queue_head_init(&xmitq);
|
|
|
|
tipc_node_lock(n);
|
|
if (!tipc_link_is_establishing(l)) {
|
|
__tipc_node_link_down(n, &bearer_id, &xmitq, &maddr);
|
|
if (delete) {
|
|
kfree(l);
|
|
le->link = NULL;
|
|
n->link_cnt--;
|
|
}
|
|
} else {
|
|
/* Defuse pending tipc_node_link_up() */
|
|
tipc_link_fsm_evt(l, LINK_RESET_EVT);
|
|
}
|
|
tipc_node_unlock(n);
|
|
tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr);
|
|
tipc_sk_rcv(n->net, &le->inputq);
|
|
}
|
|
|
|
bool tipc_node_is_up(struct tipc_node *n)
|
|
{
|
|
return n->active_links[0] != INVALID_BEARER_ID;
|
|
}
|
|
|
|
void tipc_node_check_dest(struct net *net, u32 onode,
|
|
struct tipc_bearer *b,
|
|
u16 capabilities, u32 signature,
|
|
struct tipc_media_addr *maddr,
|
|
bool *respond, bool *dupl_addr)
|
|
{
|
|
struct tipc_node *n;
|
|
struct tipc_link *l;
|
|
struct tipc_link_entry *le;
|
|
bool addr_match = false;
|
|
bool sign_match = false;
|
|
bool link_up = false;
|
|
bool accept_addr = false;
|
|
bool reset = true;
|
|
char *if_name;
|
|
|
|
*dupl_addr = false;
|
|
*respond = false;
|
|
|
|
n = tipc_node_create(net, onode, capabilities);
|
|
if (!n)
|
|
return;
|
|
|
|
tipc_node_lock(n);
|
|
|
|
le = &n->links[b->identity];
|
|
|
|
/* Prepare to validate requesting node's signature and media address */
|
|
l = le->link;
|
|
link_up = l && tipc_link_is_up(l);
|
|
addr_match = l && !memcmp(&le->maddr, maddr, sizeof(*maddr));
|
|
sign_match = (signature == n->signature);
|
|
|
|
/* These three flags give us eight permutations: */
|
|
|
|
if (sign_match && addr_match && link_up) {
|
|
/* All is fine. Do nothing. */
|
|
reset = false;
|
|
} else if (sign_match && addr_match && !link_up) {
|
|
/* Respond. The link will come up in due time */
|
|
*respond = true;
|
|
} else if (sign_match && !addr_match && link_up) {
|
|
/* Peer has changed i/f address without rebooting.
|
|
* If so, the link will reset soon, and the next
|
|
* discovery will be accepted. So we can ignore it.
|
|
* It may also be an cloned or malicious peer having
|
|
* chosen the same node address and signature as an
|
|
* existing one.
|
|
* Ignore requests until the link goes down, if ever.
|
|
*/
|
|
*dupl_addr = true;
|
|
} else if (sign_match && !addr_match && !link_up) {
|
|
/* Peer link has changed i/f address without rebooting.
|
|
* It may also be a cloned or malicious peer; we can't
|
|
* distinguish between the two.
|
|
* The signature is correct, so we must accept.
|
|
*/
|
|
accept_addr = true;
|
|
*respond = true;
|
|
} else if (!sign_match && addr_match && link_up) {
|
|
/* Peer node rebooted. Two possibilities:
|
|
* - Delayed re-discovery; this link endpoint has already
|
|
* reset and re-established contact with the peer, before
|
|
* receiving a discovery message from that node.
|
|
* (The peer happened to receive one from this node first).
|
|
* - The peer came back so fast that our side has not
|
|
* discovered it yet. Probing from this side will soon
|
|
* reset the link, since there can be no working link
|
|
* endpoint at the peer end, and the link will re-establish.
|
|
* Accept the signature, since it comes from a known peer.
|
|
*/
|
|
n->signature = signature;
|
|
} else if (!sign_match && addr_match && !link_up) {
|
|
/* The peer node has rebooted.
|
|
* Accept signature, since it is a known peer.
|
|
*/
|
|
n->signature = signature;
|
|
*respond = true;
|
|
} else if (!sign_match && !addr_match && link_up) {
|
|
/* Peer rebooted with new address, or a new/duplicate peer.
|
|
* Ignore until the link goes down, if ever.
|
|
*/
|
|
*dupl_addr = true;
|
|
} else if (!sign_match && !addr_match && !link_up) {
|
|
/* Peer rebooted with new address, or it is a new peer.
|
|
* Accept signature and address.
|
|
*/
|
|
n->signature = signature;
|
|
accept_addr = true;
|
|
*respond = true;
|
|
}
|
|
|
|
if (!accept_addr)
|
|
goto exit;
|
|
|
|
/* Now create new link if not already existing */
|
|
if (!l) {
|
|
if (n->link_cnt == 2) {
|
|
pr_warn("Cannot establish 3rd link to %x\n", n->addr);
|
|
goto exit;
|
|
}
|
|
if_name = strchr(b->name, ':') + 1;
|
|
if (!tipc_link_create(net, if_name, b->identity, b->tolerance,
|
|
b->net_plane, b->mtu, b->priority,
|
|
b->window, mod(tipc_net(net)->random),
|
|
tipc_own_addr(net), onode,
|
|
n->capabilities,
|
|
tipc_bc_sndlink(n->net), n->bc_entry.link,
|
|
&le->inputq,
|
|
&n->bc_entry.namedq, &l)) {
|
|
*respond = false;
|
|
goto exit;
|
|
}
|
|
tipc_link_reset(l);
|
|
tipc_link_fsm_evt(l, LINK_RESET_EVT);
|
|
if (n->state == NODE_FAILINGOVER)
|
|
tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
|
|
le->link = l;
|
|
n->link_cnt++;
|
|
tipc_node_calculate_timer(n, l);
|
|
if (n->link_cnt == 1)
|
|
if (!mod_timer(&n->timer, jiffies + n->keepalive_intv))
|
|
tipc_node_get(n);
|
|
}
|
|
memcpy(&le->maddr, maddr, sizeof(*maddr));
|
|
exit:
|
|
tipc_node_unlock(n);
|
|
if (reset && !tipc_link_is_reset(l))
|
|
tipc_node_link_down(n, b->identity, false);
|
|
tipc_node_put(n);
|
|
}
|
|
|
|
void tipc_node_delete_links(struct net *net, int bearer_id)
|
|
{
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
struct tipc_node *n;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(n, &tn->node_list, list) {
|
|
tipc_node_link_down(n, bearer_id, true);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void tipc_node_reset_links(struct tipc_node *n)
|
|
{
|
|
char addr_string[16];
|
|
int i;
|
|
|
|
pr_warn("Resetting all links to %s\n",
|
|
tipc_addr_string_fill(addr_string, n->addr));
|
|
|
|
for (i = 0; i < MAX_BEARERS; i++) {
|
|
tipc_node_link_down(n, i, false);
|
|
}
|
|
}
|
|
|
|
/* tipc_node_fsm_evt - node finite state machine
|
|
* Determines when contact is allowed with peer node
|
|
*/
|
|
static void tipc_node_fsm_evt(struct tipc_node *n, int evt)
|
|
{
|
|
int state = n->state;
|
|
|
|
switch (state) {
|
|
case SELF_DOWN_PEER_DOWN:
|
|
switch (evt) {
|
|
case SELF_ESTABL_CONTACT_EVT:
|
|
state = SELF_UP_PEER_COMING;
|
|
break;
|
|
case PEER_ESTABL_CONTACT_EVT:
|
|
state = SELF_COMING_PEER_UP;
|
|
break;
|
|
case SELF_LOST_CONTACT_EVT:
|
|
case PEER_LOST_CONTACT_EVT:
|
|
break;
|
|
case NODE_SYNCH_END_EVT:
|
|
case NODE_SYNCH_BEGIN_EVT:
|
|
case NODE_FAILOVER_BEGIN_EVT:
|
|
case NODE_FAILOVER_END_EVT:
|
|
default:
|
|
goto illegal_evt;
|
|
}
|
|
break;
|
|
case SELF_UP_PEER_UP:
|
|
switch (evt) {
|
|
case SELF_LOST_CONTACT_EVT:
|
|
state = SELF_DOWN_PEER_LEAVING;
|
|
break;
|
|
case PEER_LOST_CONTACT_EVT:
|
|
state = SELF_LEAVING_PEER_DOWN;
|
|
break;
|
|
case NODE_SYNCH_BEGIN_EVT:
|
|
state = NODE_SYNCHING;
|
|
break;
|
|
case NODE_FAILOVER_BEGIN_EVT:
|
|
state = NODE_FAILINGOVER;
|
|
break;
|
|
case SELF_ESTABL_CONTACT_EVT:
|
|
case PEER_ESTABL_CONTACT_EVT:
|
|
case NODE_SYNCH_END_EVT:
|
|
case NODE_FAILOVER_END_EVT:
|
|
break;
|
|
default:
|
|
goto illegal_evt;
|
|
}
|
|
break;
|
|
case SELF_DOWN_PEER_LEAVING:
|
|
switch (evt) {
|
|
case PEER_LOST_CONTACT_EVT:
|
|
state = SELF_DOWN_PEER_DOWN;
|
|
break;
|
|
case SELF_ESTABL_CONTACT_EVT:
|
|
case PEER_ESTABL_CONTACT_EVT:
|
|
case SELF_LOST_CONTACT_EVT:
|
|
break;
|
|
case NODE_SYNCH_END_EVT:
|
|
case NODE_SYNCH_BEGIN_EVT:
|
|
case NODE_FAILOVER_BEGIN_EVT:
|
|
case NODE_FAILOVER_END_EVT:
|
|
default:
|
|
goto illegal_evt;
|
|
}
|
|
break;
|
|
case SELF_UP_PEER_COMING:
|
|
switch (evt) {
|
|
case PEER_ESTABL_CONTACT_EVT:
|
|
state = SELF_UP_PEER_UP;
|
|
break;
|
|
case SELF_LOST_CONTACT_EVT:
|
|
state = SELF_DOWN_PEER_LEAVING;
|
|
break;
|
|
case SELF_ESTABL_CONTACT_EVT:
|
|
case PEER_LOST_CONTACT_EVT:
|
|
case NODE_SYNCH_END_EVT:
|
|
case NODE_FAILOVER_BEGIN_EVT:
|
|
break;
|
|
case NODE_SYNCH_BEGIN_EVT:
|
|
case NODE_FAILOVER_END_EVT:
|
|
default:
|
|
goto illegal_evt;
|
|
}
|
|
break;
|
|
case SELF_COMING_PEER_UP:
|
|
switch (evt) {
|
|
case SELF_ESTABL_CONTACT_EVT:
|
|
state = SELF_UP_PEER_UP;
|
|
break;
|
|
case PEER_LOST_CONTACT_EVT:
|
|
state = SELF_LEAVING_PEER_DOWN;
|
|
break;
|
|
case SELF_LOST_CONTACT_EVT:
|
|
case PEER_ESTABL_CONTACT_EVT:
|
|
break;
|
|
case NODE_SYNCH_END_EVT:
|
|
case NODE_SYNCH_BEGIN_EVT:
|
|
case NODE_FAILOVER_BEGIN_EVT:
|
|
case NODE_FAILOVER_END_EVT:
|
|
default:
|
|
goto illegal_evt;
|
|
}
|
|
break;
|
|
case SELF_LEAVING_PEER_DOWN:
|
|
switch (evt) {
|
|
case SELF_LOST_CONTACT_EVT:
|
|
state = SELF_DOWN_PEER_DOWN;
|
|
break;
|
|
case SELF_ESTABL_CONTACT_EVT:
|
|
case PEER_ESTABL_CONTACT_EVT:
|
|
case PEER_LOST_CONTACT_EVT:
|
|
break;
|
|
case NODE_SYNCH_END_EVT:
|
|
case NODE_SYNCH_BEGIN_EVT:
|
|
case NODE_FAILOVER_BEGIN_EVT:
|
|
case NODE_FAILOVER_END_EVT:
|
|
default:
|
|
goto illegal_evt;
|
|
}
|
|
break;
|
|
case NODE_FAILINGOVER:
|
|
switch (evt) {
|
|
case SELF_LOST_CONTACT_EVT:
|
|
state = SELF_DOWN_PEER_LEAVING;
|
|
break;
|
|
case PEER_LOST_CONTACT_EVT:
|
|
state = SELF_LEAVING_PEER_DOWN;
|
|
break;
|
|
case NODE_FAILOVER_END_EVT:
|
|
state = SELF_UP_PEER_UP;
|
|
break;
|
|
case NODE_FAILOVER_BEGIN_EVT:
|
|
case SELF_ESTABL_CONTACT_EVT:
|
|
case PEER_ESTABL_CONTACT_EVT:
|
|
break;
|
|
case NODE_SYNCH_BEGIN_EVT:
|
|
case NODE_SYNCH_END_EVT:
|
|
default:
|
|
goto illegal_evt;
|
|
}
|
|
break;
|
|
case NODE_SYNCHING:
|
|
switch (evt) {
|
|
case SELF_LOST_CONTACT_EVT:
|
|
state = SELF_DOWN_PEER_LEAVING;
|
|
break;
|
|
case PEER_LOST_CONTACT_EVT:
|
|
state = SELF_LEAVING_PEER_DOWN;
|
|
break;
|
|
case NODE_SYNCH_END_EVT:
|
|
state = SELF_UP_PEER_UP;
|
|
break;
|
|
case NODE_FAILOVER_BEGIN_EVT:
|
|
state = NODE_FAILINGOVER;
|
|
break;
|
|
case NODE_SYNCH_BEGIN_EVT:
|
|
case SELF_ESTABL_CONTACT_EVT:
|
|
case PEER_ESTABL_CONTACT_EVT:
|
|
break;
|
|
case NODE_FAILOVER_END_EVT:
|
|
default:
|
|
goto illegal_evt;
|
|
}
|
|
break;
|
|
default:
|
|
pr_err("Unknown node fsm state %x\n", state);
|
|
break;
|
|
}
|
|
n->state = state;
|
|
return;
|
|
|
|
illegal_evt:
|
|
pr_err("Illegal node fsm evt %x in state %x\n", evt, state);
|
|
}
|
|
|
|
bool tipc_node_filter_pkt(struct tipc_node *n, struct tipc_msg *hdr)
|
|
{
|
|
int state = n->state;
|
|
|
|
if (likely(state == SELF_UP_PEER_UP))
|
|
return true;
|
|
|
|
if (state == SELF_LEAVING_PEER_DOWN)
|
|
return false;
|
|
|
|
if (state == SELF_DOWN_PEER_LEAVING) {
|
|
if (msg_peer_node_is_up(hdr))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static void node_lost_contact(struct tipc_node *n,
|
|
struct sk_buff_head *inputq)
|
|
{
|
|
char addr_string[16];
|
|
struct tipc_sock_conn *conn, *safe;
|
|
struct tipc_link *l;
|
|
struct list_head *conns = &n->conn_sks;
|
|
struct sk_buff *skb;
|
|
uint i;
|
|
|
|
pr_debug("Lost contact with %s\n",
|
|
tipc_addr_string_fill(addr_string, n->addr));
|
|
|
|
/* Clean up broadcast state */
|
|
tipc_bcast_remove_peer(n->net, n->bc_entry.link);
|
|
|
|
/* Abort any ongoing link failover */
|
|
for (i = 0; i < MAX_BEARERS; i++) {
|
|
l = n->links[i].link;
|
|
if (l)
|
|
tipc_link_fsm_evt(l, LINK_FAILOVER_END_EVT);
|
|
}
|
|
|
|
/* Notify publications from this node */
|
|
n->action_flags |= TIPC_NOTIFY_NODE_DOWN;
|
|
|
|
/* Notify sockets connected to node */
|
|
list_for_each_entry_safe(conn, safe, conns, list) {
|
|
skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
|
|
SHORT_H_SIZE, 0, tipc_own_addr(n->net),
|
|
conn->peer_node, conn->port,
|
|
conn->peer_port, TIPC_ERR_NO_NODE);
|
|
if (likely(skb))
|
|
skb_queue_tail(inputq, skb);
|
|
list_del(&conn->list);
|
|
kfree(conn);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* tipc_node_get_linkname - get the name of a link
|
|
*
|
|
* @bearer_id: id of the bearer
|
|
* @node: peer node address
|
|
* @linkname: link name output buffer
|
|
*
|
|
* Returns 0 on success
|
|
*/
|
|
int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr,
|
|
char *linkname, size_t len)
|
|
{
|
|
struct tipc_link *link;
|
|
int err = -EINVAL;
|
|
struct tipc_node *node = tipc_node_find(net, addr);
|
|
|
|
if (!node)
|
|
return err;
|
|
|
|
if (bearer_id >= MAX_BEARERS)
|
|
goto exit;
|
|
|
|
tipc_node_lock(node);
|
|
link = node->links[bearer_id].link;
|
|
if (link) {
|
|
strncpy(linkname, link->name, len);
|
|
err = 0;
|
|
}
|
|
exit:
|
|
tipc_node_unlock(node);
|
|
tipc_node_put(node);
|
|
return err;
|
|
}
|
|
|
|
void tipc_node_unlock(struct tipc_node *node)
|
|
{
|
|
struct net *net = node->net;
|
|
u32 addr = 0;
|
|
u32 flags = node->action_flags;
|
|
u32 link_id = 0;
|
|
struct list_head *publ_list;
|
|
|
|
if (likely(!flags)) {
|
|
spin_unlock_bh(&node->lock);
|
|
return;
|
|
}
|
|
|
|
addr = node->addr;
|
|
link_id = node->link_id;
|
|
publ_list = &node->publ_list;
|
|
|
|
node->action_flags &= ~(TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP |
|
|
TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP);
|
|
|
|
spin_unlock_bh(&node->lock);
|
|
|
|
if (flags & TIPC_NOTIFY_NODE_DOWN)
|
|
tipc_publ_notify(net, publ_list, addr);
|
|
|
|
if (flags & TIPC_NOTIFY_NODE_UP)
|
|
tipc_named_node_up(net, addr);
|
|
|
|
if (flags & TIPC_NOTIFY_LINK_UP)
|
|
tipc_nametbl_publish(net, TIPC_LINK_STATE, addr, addr,
|
|
TIPC_NODE_SCOPE, link_id, addr);
|
|
|
|
if (flags & TIPC_NOTIFY_LINK_DOWN)
|
|
tipc_nametbl_withdraw(net, TIPC_LINK_STATE, addr,
|
|
link_id, addr);
|
|
|
|
}
|
|
|
|
/* Caller should hold node lock for the passed node */
|
|
static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node)
|
|
{
|
|
void *hdr;
|
|
struct nlattr *attrs;
|
|
|
|
hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
|
|
NLM_F_MULTI, TIPC_NL_NODE_GET);
|
|
if (!hdr)
|
|
return -EMSGSIZE;
|
|
|
|
attrs = nla_nest_start(msg->skb, TIPC_NLA_NODE);
|
|
if (!attrs)
|
|
goto msg_full;
|
|
|
|
if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr))
|
|
goto attr_msg_full;
|
|
if (tipc_node_is_up(node))
|
|
if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP))
|
|
goto attr_msg_full;
|
|
|
|
nla_nest_end(msg->skb, attrs);
|
|
genlmsg_end(msg->skb, hdr);
|
|
|
|
return 0;
|
|
|
|
attr_msg_full:
|
|
nla_nest_cancel(msg->skb, attrs);
|
|
msg_full:
|
|
genlmsg_cancel(msg->skb, hdr);
|
|
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static struct tipc_link *tipc_node_select_link(struct tipc_node *n, int sel,
|
|
int *bearer_id,
|
|
struct tipc_media_addr **maddr)
|
|
{
|
|
int id = n->active_links[sel & 1];
|
|
|
|
if (unlikely(id < 0))
|
|
return NULL;
|
|
|
|
*bearer_id = id;
|
|
*maddr = &n->links[id].maddr;
|
|
return n->links[id].link;
|
|
}
|
|
|
|
/**
|
|
* tipc_node_xmit() is the general link level function for message sending
|
|
* @net: the applicable net namespace
|
|
* @list: chain of buffers containing message
|
|
* @dnode: address of destination node
|
|
* @selector: a number used for deterministic link selection
|
|
* Consumes the buffer chain, except when returning -ELINKCONG
|
|
* Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE
|
|
*/
|
|
int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
|
|
u32 dnode, int selector)
|
|
{
|
|
struct tipc_link *l = NULL;
|
|
struct tipc_node *n;
|
|
struct sk_buff_head xmitq;
|
|
struct tipc_media_addr *maddr;
|
|
int bearer_id;
|
|
int rc = -EHOSTUNREACH;
|
|
|
|
__skb_queue_head_init(&xmitq);
|
|
n = tipc_node_find(net, dnode);
|
|
if (likely(n)) {
|
|
tipc_node_lock(n);
|
|
l = tipc_node_select_link(n, selector, &bearer_id, &maddr);
|
|
if (likely(l))
|
|
rc = tipc_link_xmit(l, list, &xmitq);
|
|
tipc_node_unlock(n);
|
|
if (unlikely(rc == -ENOBUFS))
|
|
tipc_node_link_down(n, bearer_id, false);
|
|
tipc_node_put(n);
|
|
}
|
|
if (likely(!rc)) {
|
|
tipc_bearer_xmit(net, bearer_id, &xmitq, maddr);
|
|
return 0;
|
|
}
|
|
if (likely(in_own_node(net, dnode))) {
|
|
tipc_sk_rcv(net, list);
|
|
return 0;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/* tipc_node_xmit_skb(): send single buffer to destination
|
|
* Buffers sent via this functon are generally TIPC_SYSTEM_IMPORTANCE
|
|
* messages, which will not be rejected
|
|
* The only exception is datagram messages rerouted after secondary
|
|
* lookup, which are rare and safe to dispose of anyway.
|
|
* TODO: Return real return value, and let callers use
|
|
* tipc_wait_for_sendpkt() where applicable
|
|
*/
|
|
int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
|
|
u32 selector)
|
|
{
|
|
struct sk_buff_head head;
|
|
int rc;
|
|
|
|
skb_queue_head_init(&head);
|
|
__skb_queue_tail(&head, skb);
|
|
rc = tipc_node_xmit(net, &head, dnode, selector);
|
|
if (rc == -ELINKCONG)
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tipc_node_bc_rcv - process TIPC broadcast packet arriving from off-node
|
|
* @net: the applicable net namespace
|
|
* @skb: TIPC packet
|
|
* @bearer_id: id of bearer message arrived on
|
|
*
|
|
* Invoked with no locks held.
|
|
*/
|
|
static void tipc_node_bc_rcv(struct net *net, struct sk_buff *skb, int bearer_id)
|
|
{
|
|
int rc;
|
|
struct sk_buff_head xmitq;
|
|
struct tipc_bclink_entry *be;
|
|
struct tipc_link_entry *le;
|
|
struct tipc_msg *hdr = buf_msg(skb);
|
|
int usr = msg_user(hdr);
|
|
u32 dnode = msg_destnode(hdr);
|
|
struct tipc_node *n;
|
|
|
|
__skb_queue_head_init(&xmitq);
|
|
|
|
/* If NACK for other node, let rcv link for that node peek into it */
|
|
if ((usr == BCAST_PROTOCOL) && (dnode != tipc_own_addr(net)))
|
|
n = tipc_node_find(net, dnode);
|
|
else
|
|
n = tipc_node_find(net, msg_prevnode(hdr));
|
|
if (!n) {
|
|
kfree_skb(skb);
|
|
return;
|
|
}
|
|
be = &n->bc_entry;
|
|
le = &n->links[bearer_id];
|
|
|
|
rc = tipc_bcast_rcv(net, be->link, skb);
|
|
|
|
/* Broadcast link reset may happen at reassembly failure */
|
|
if (rc & TIPC_LINK_DOWN_EVT)
|
|
tipc_node_reset_links(n);
|
|
|
|
/* Broadcast ACKs are sent on a unicast link */
|
|
if (rc & TIPC_LINK_SND_BC_ACK) {
|
|
tipc_node_lock(n);
|
|
tipc_link_build_ack_msg(le->link, &xmitq);
|
|
tipc_node_unlock(n);
|
|
}
|
|
|
|
if (!skb_queue_empty(&xmitq))
|
|
tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
|
|
|
|
/* Deliver. 'arrvq' is under inputq2's lock protection */
|
|
if (!skb_queue_empty(&be->inputq1)) {
|
|
spin_lock_bh(&be->inputq2.lock);
|
|
spin_lock_bh(&be->inputq1.lock);
|
|
skb_queue_splice_tail_init(&be->inputq1, &be->arrvq);
|
|
spin_unlock_bh(&be->inputq1.lock);
|
|
spin_unlock_bh(&be->inputq2.lock);
|
|
tipc_sk_mcast_rcv(net, &be->arrvq, &be->inputq2);
|
|
}
|
|
tipc_node_put(n);
|
|
}
|
|
|
|
/**
|
|
* tipc_node_check_state - check and if necessary update node state
|
|
* @skb: TIPC packet
|
|
* @bearer_id: identity of bearer delivering the packet
|
|
* Returns true if state is ok, otherwise consumes buffer and returns false
|
|
*/
|
|
static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,
|
|
int bearer_id, struct sk_buff_head *xmitq)
|
|
{
|
|
struct tipc_msg *hdr = buf_msg(skb);
|
|
int usr = msg_user(hdr);
|
|
int mtyp = msg_type(hdr);
|
|
u16 oseqno = msg_seqno(hdr);
|
|
u16 iseqno = msg_seqno(msg_get_wrapped(hdr));
|
|
u16 exp_pkts = msg_msgcnt(hdr);
|
|
u16 rcv_nxt, syncpt, dlv_nxt;
|
|
int state = n->state;
|
|
struct tipc_link *l, *tnl, *pl = NULL;
|
|
struct tipc_media_addr *maddr;
|
|
int i, pb_id;
|
|
|
|
l = n->links[bearer_id].link;
|
|
if (!l)
|
|
return false;
|
|
rcv_nxt = l->rcv_nxt;
|
|
|
|
|
|
if (likely((state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL)))
|
|
return true;
|
|
|
|
/* Find parallel link, if any */
|
|
for (i = 0; i < MAX_BEARERS; i++) {
|
|
if ((i != bearer_id) && n->links[i].link) {
|
|
pl = n->links[i].link;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Update node accesibility if applicable */
|
|
if (state == SELF_UP_PEER_COMING) {
|
|
if (!tipc_link_is_up(l))
|
|
return true;
|
|
if (!msg_peer_link_is_up(hdr))
|
|
return true;
|
|
tipc_node_fsm_evt(n, PEER_ESTABL_CONTACT_EVT);
|
|
}
|
|
|
|
if (state == SELF_DOWN_PEER_LEAVING) {
|
|
if (msg_peer_node_is_up(hdr))
|
|
return false;
|
|
tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
|
|
}
|
|
|
|
/* Ignore duplicate packets */
|
|
if ((usr != LINK_PROTOCOL) && less(oseqno, rcv_nxt))
|
|
return true;
|
|
|
|
/* Initiate or update failover mode if applicable */
|
|
if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) {
|
|
syncpt = oseqno + exp_pkts - 1;
|
|
if (pl && tipc_link_is_up(pl)) {
|
|
pb_id = pl->bearer_id;
|
|
__tipc_node_link_down(n, &pb_id, xmitq, &maddr);
|
|
tipc_skb_queue_splice_tail_init(pl->inputq, l->inputq);
|
|
}
|
|
/* If pkts arrive out of order, use lowest calculated syncpt */
|
|
if (less(syncpt, n->sync_point))
|
|
n->sync_point = syncpt;
|
|
}
|
|
|
|
/* Open parallel link when tunnel link reaches synch point */
|
|
if ((n->state == NODE_FAILINGOVER) && tipc_link_is_up(l)) {
|
|
if (!more(rcv_nxt, n->sync_point))
|
|
return true;
|
|
tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT);
|
|
if (pl)
|
|
tipc_link_fsm_evt(pl, LINK_FAILOVER_END_EVT);
|
|
return true;
|
|
}
|
|
|
|
/* No synching needed if only one link */
|
|
if (!pl || !tipc_link_is_up(pl))
|
|
return true;
|
|
|
|
/* Initiate synch mode if applicable */
|
|
if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG) && (oseqno == 1)) {
|
|
syncpt = iseqno + exp_pkts - 1;
|
|
if (!tipc_link_is_up(l)) {
|
|
tipc_link_fsm_evt(l, LINK_ESTABLISH_EVT);
|
|
__tipc_node_link_up(n, bearer_id, xmitq);
|
|
}
|
|
if (n->state == SELF_UP_PEER_UP) {
|
|
n->sync_point = syncpt;
|
|
tipc_link_fsm_evt(l, LINK_SYNCH_BEGIN_EVT);
|
|
tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT);
|
|
}
|
|
if (less(syncpt, n->sync_point))
|
|
n->sync_point = syncpt;
|
|
}
|
|
|
|
/* Open tunnel link when parallel link reaches synch point */
|
|
if ((n->state == NODE_SYNCHING) && tipc_link_is_synching(l)) {
|
|
if (tipc_link_is_synching(l)) {
|
|
tnl = l;
|
|
} else {
|
|
tnl = pl;
|
|
pl = l;
|
|
}
|
|
dlv_nxt = pl->rcv_nxt - mod(skb_queue_len(pl->inputq));
|
|
if (more(dlv_nxt, n->sync_point)) {
|
|
tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
|
|
tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
|
|
return true;
|
|
}
|
|
if (l == pl)
|
|
return true;
|
|
if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG))
|
|
return true;
|
|
if (usr == LINK_PROTOCOL)
|
|
return true;
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* tipc_rcv - process TIPC packets/messages arriving from off-node
|
|
* @net: the applicable net namespace
|
|
* @skb: TIPC packet
|
|
* @bearer: pointer to bearer message arrived on
|
|
*
|
|
* Invoked with no locks held. Bearer pointer must point to a valid bearer
|
|
* structure (i.e. cannot be NULL), but bearer can be inactive.
|
|
*/
|
|
void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)
|
|
{
|
|
struct sk_buff_head xmitq;
|
|
struct tipc_node *n;
|
|
struct tipc_msg *hdr = buf_msg(skb);
|
|
int usr = msg_user(hdr);
|
|
int bearer_id = b->identity;
|
|
struct tipc_link_entry *le;
|
|
u16 bc_ack = msg_bcast_ack(hdr);
|
|
int rc = 0;
|
|
|
|
__skb_queue_head_init(&xmitq);
|
|
|
|
/* Ensure message is well-formed */
|
|
if (unlikely(!tipc_msg_validate(skb)))
|
|
goto discard;
|
|
|
|
/* Handle arrival of discovery or broadcast packet */
|
|
if (unlikely(msg_non_seq(hdr))) {
|
|
if (unlikely(usr == LINK_CONFIG))
|
|
return tipc_disc_rcv(net, skb, b);
|
|
else
|
|
return tipc_node_bc_rcv(net, skb, bearer_id);
|
|
}
|
|
|
|
/* Locate neighboring node that sent packet */
|
|
n = tipc_node_find(net, msg_prevnode(hdr));
|
|
if (unlikely(!n))
|
|
goto discard;
|
|
le = &n->links[bearer_id];
|
|
|
|
/* Ensure broadcast reception is in synch with peer's send state */
|
|
if (unlikely(usr == LINK_PROTOCOL))
|
|
tipc_bcast_sync_rcv(net, n->bc_entry.link, hdr);
|
|
else if (unlikely(n->bc_entry.link->acked != bc_ack))
|
|
tipc_bcast_ack_rcv(net, n->bc_entry.link, bc_ack);
|
|
|
|
tipc_node_lock(n);
|
|
|
|
/* Is reception permitted at the moment ? */
|
|
if (!tipc_node_filter_pkt(n, hdr))
|
|
goto unlock;
|
|
|
|
/* Check and if necessary update node state */
|
|
if (likely(tipc_node_check_state(n, skb, bearer_id, &xmitq))) {
|
|
rc = tipc_link_rcv(le->link, skb, &xmitq);
|
|
skb = NULL;
|
|
}
|
|
unlock:
|
|
tipc_node_unlock(n);
|
|
|
|
if (unlikely(rc & TIPC_LINK_UP_EVT))
|
|
tipc_node_link_up(n, bearer_id, &xmitq);
|
|
|
|
if (unlikely(rc & TIPC_LINK_DOWN_EVT))
|
|
tipc_node_link_down(n, bearer_id, false);
|
|
|
|
if (unlikely(!skb_queue_empty(&n->bc_entry.namedq)))
|
|
tipc_named_rcv(net, &n->bc_entry.namedq);
|
|
|
|
if (!skb_queue_empty(&le->inputq))
|
|
tipc_sk_rcv(net, &le->inputq);
|
|
|
|
if (!skb_queue_empty(&xmitq))
|
|
tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
|
|
|
|
tipc_node_put(n);
|
|
discard:
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
int err;
|
|
struct net *net = sock_net(skb->sk);
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
int done = cb->args[0];
|
|
int last_addr = cb->args[1];
|
|
struct tipc_node *node;
|
|
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();
|
|
if (last_addr) {
|
|
node = tipc_node_find(net, last_addr);
|
|
if (!node) {
|
|
rcu_read_unlock();
|
|
/* 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 the node state
|
|
* changed while we released the lock.
|
|
*/
|
|
cb->prev_seq = 1;
|
|
return -EPIPE;
|
|
}
|
|
tipc_node_put(node);
|
|
}
|
|
|
|
list_for_each_entry_rcu(node, &tn->node_list, list) {
|
|
if (last_addr) {
|
|
if (node->addr == last_addr)
|
|
last_addr = 0;
|
|
else
|
|
continue;
|
|
}
|
|
|
|
tipc_node_lock(node);
|
|
err = __tipc_nl_add_node(&msg, node);
|
|
if (err) {
|
|
last_addr = node->addr;
|
|
tipc_node_unlock(node);
|
|
goto out;
|
|
}
|
|
|
|
tipc_node_unlock(node);
|
|
}
|
|
done = 1;
|
|
out:
|
|
cb->args[0] = done;
|
|
cb->args[1] = last_addr;
|
|
rcu_read_unlock();
|
|
|
|
return skb->len;
|
|
}
|