409 lines
11 KiB
C
409 lines
11 KiB
C
/*
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* net/tipc/name_distr.c: TIPC name distribution code
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*
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* Copyright (c) 2000-2006, 2014, Ericsson AB
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* Copyright (c) 2005, 2010-2011, 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 "name_distr.h"
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int sysctl_tipc_named_timeout __read_mostly = 2000;
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struct distr_queue_item {
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struct distr_item i;
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u32 dtype;
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u32 node;
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unsigned long expires;
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struct list_head next;
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};
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/**
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* publ_to_item - add publication info to a publication message
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*/
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static void publ_to_item(struct distr_item *i, struct publication *p)
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{
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i->type = htonl(p->type);
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i->lower = htonl(p->lower);
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i->upper = htonl(p->upper);
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i->port = htonl(p->port);
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i->key = htonl(p->key);
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}
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/**
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* named_prepare_buf - allocate & initialize a publication message
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*
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* The buffer returned is of size INT_H_SIZE + payload size
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*/
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static struct sk_buff *named_prepare_buf(struct net *net, u32 type, u32 size,
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u32 dest)
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{
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struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size, GFP_ATOMIC);
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u32 self = tipc_own_addr(net);
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struct tipc_msg *msg;
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if (buf != NULL) {
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msg = buf_msg(buf);
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tipc_msg_init(self, msg, NAME_DISTRIBUTOR,
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type, INT_H_SIZE, dest);
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msg_set_size(msg, INT_H_SIZE + size);
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}
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return buf;
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}
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/**
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* tipc_named_publish - tell other nodes about a new publication by this node
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*/
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struct sk_buff *tipc_named_publish(struct net *net, struct publication *publ)
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{
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struct name_table *nt = tipc_name_table(net);
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struct distr_item *item;
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struct sk_buff *skb;
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if (publ->scope == TIPC_NODE_SCOPE) {
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list_add_tail_rcu(&publ->binding_node, &nt->node_scope);
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return NULL;
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}
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write_lock_bh(&nt->cluster_scope_lock);
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list_add_tail(&publ->binding_node, &nt->cluster_scope);
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write_unlock_bh(&nt->cluster_scope_lock);
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skb = named_prepare_buf(net, PUBLICATION, ITEM_SIZE, 0);
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if (!skb) {
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pr_warn("Publication distribution failure\n");
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return NULL;
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}
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msg_set_named_seqno(buf_msg(skb), nt->snd_nxt++);
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msg_set_non_legacy(buf_msg(skb));
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item = (struct distr_item *)msg_data(buf_msg(skb));
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publ_to_item(item, publ);
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return skb;
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}
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/**
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* tipc_named_withdraw - tell other nodes about a withdrawn publication by this node
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*/
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struct sk_buff *tipc_named_withdraw(struct net *net, struct publication *publ)
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{
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struct name_table *nt = tipc_name_table(net);
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struct distr_item *item;
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struct sk_buff *skb;
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write_lock_bh(&nt->cluster_scope_lock);
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list_del(&publ->binding_node);
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write_unlock_bh(&nt->cluster_scope_lock);
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if (publ->scope == TIPC_NODE_SCOPE)
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return NULL;
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skb = named_prepare_buf(net, WITHDRAWAL, ITEM_SIZE, 0);
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if (!skb) {
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pr_warn("Withdrawal distribution failure\n");
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return NULL;
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}
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msg_set_named_seqno(buf_msg(skb), nt->snd_nxt++);
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msg_set_non_legacy(buf_msg(skb));
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item = (struct distr_item *)msg_data(buf_msg(skb));
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publ_to_item(item, publ);
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return skb;
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}
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/**
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* named_distribute - prepare name info for bulk distribution to another node
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* @list: list of messages (buffers) to be returned from this function
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* @dnode: node to be updated
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* @pls: linked list of publication items to be packed into buffer chain
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*/
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static void named_distribute(struct net *net, struct sk_buff_head *list,
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u32 dnode, struct list_head *pls, u16 seqno)
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{
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struct publication *publ;
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struct sk_buff *skb = NULL;
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struct distr_item *item = NULL;
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u32 msg_dsz = ((tipc_node_get_mtu(net, dnode, 0, false) - INT_H_SIZE) /
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ITEM_SIZE) * ITEM_SIZE;
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u32 msg_rem = msg_dsz;
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struct tipc_msg *hdr;
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list_for_each_entry(publ, pls, binding_node) {
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/* Prepare next buffer: */
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if (!skb) {
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skb = named_prepare_buf(net, PUBLICATION, msg_rem,
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dnode);
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if (!skb) {
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pr_warn("Bulk publication failure\n");
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return;
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}
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hdr = buf_msg(skb);
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msg_set_bc_ack_invalid(hdr, true);
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msg_set_bulk(hdr);
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msg_set_non_legacy(hdr);
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item = (struct distr_item *)msg_data(hdr);
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}
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/* Pack publication into message: */
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publ_to_item(item, publ);
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item++;
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msg_rem -= ITEM_SIZE;
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/* Append full buffer to list: */
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if (!msg_rem) {
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__skb_queue_tail(list, skb);
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skb = NULL;
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msg_rem = msg_dsz;
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}
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}
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if (skb) {
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hdr = buf_msg(skb);
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msg_set_size(hdr, INT_H_SIZE + (msg_dsz - msg_rem));
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skb_trim(skb, INT_H_SIZE + (msg_dsz - msg_rem));
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__skb_queue_tail(list, skb);
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}
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hdr = buf_msg(skb_peek_tail(list));
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msg_set_last_bulk(hdr);
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msg_set_named_seqno(hdr, seqno);
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}
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/**
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* tipc_named_node_up - tell specified node about all publications by this node
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*/
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void tipc_named_node_up(struct net *net, u32 dnode, u16 capabilities)
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{
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struct name_table *nt = tipc_name_table(net);
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struct tipc_net *tn = tipc_net(net);
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struct sk_buff_head head;
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u16 seqno;
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__skb_queue_head_init(&head);
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spin_lock_bh(&tn->nametbl_lock);
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if (!(capabilities & TIPC_NAMED_BCAST))
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nt->rc_dests++;
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seqno = nt->snd_nxt;
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spin_unlock_bh(&tn->nametbl_lock);
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read_lock_bh(&nt->cluster_scope_lock);
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named_distribute(net, &head, dnode, &nt->cluster_scope, seqno);
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tipc_node_xmit(net, &head, dnode, 0);
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read_unlock_bh(&nt->cluster_scope_lock);
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}
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/**
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* tipc_publ_purge - remove publication associated with a failed node
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*
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* Invoked for each publication issued by a newly failed node.
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* Removes publication structure from name table & deletes it.
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*/
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static void tipc_publ_purge(struct net *net, struct publication *publ, u32 addr)
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{
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struct tipc_net *tn = tipc_net(net);
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struct publication *p;
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spin_lock_bh(&tn->nametbl_lock);
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p = tipc_nametbl_remove_publ(net, publ->type, publ->lower, publ->upper,
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publ->node, publ->key);
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if (p)
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tipc_node_unsubscribe(net, &p->binding_node, addr);
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spin_unlock_bh(&tn->nametbl_lock);
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if (p != publ) {
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pr_err("Unable to remove publication from failed node\n"
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" (type=%u, lower=%u, node=0x%x, port=%u, key=%u)\n",
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publ->type, publ->lower, publ->node, publ->port,
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publ->key);
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}
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if (p)
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kfree_rcu(p, rcu);
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}
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/**
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* tipc_dist_queue_purge - remove deferred updates from a node that went down
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*/
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static void tipc_dist_queue_purge(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 distr_queue_item *e, *tmp;
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spin_lock_bh(&tn->nametbl_lock);
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list_for_each_entry_safe(e, tmp, &tn->dist_queue, next) {
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if (e->node != addr)
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continue;
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list_del(&e->next);
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kfree(e);
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}
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spin_unlock_bh(&tn->nametbl_lock);
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}
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void tipc_publ_notify(struct net *net, struct list_head *nsub_list,
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u32 addr, u16 capabilities)
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{
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struct name_table *nt = tipc_name_table(net);
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struct tipc_net *tn = tipc_net(net);
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struct publication *publ, *tmp;
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list_for_each_entry_safe(publ, tmp, nsub_list, binding_node)
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tipc_publ_purge(net, publ, addr);
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tipc_dist_queue_purge(net, addr);
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spin_lock_bh(&tn->nametbl_lock);
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if (!(capabilities & TIPC_NAMED_BCAST))
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nt->rc_dests--;
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spin_unlock_bh(&tn->nametbl_lock);
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}
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/**
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* tipc_update_nametbl - try to process a nametable update and notify
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* subscribers
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*
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* tipc_nametbl_lock must be held.
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* Returns the publication item if successful, otherwise NULL.
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*/
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static bool tipc_update_nametbl(struct net *net, struct distr_item *i,
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u32 node, u32 dtype)
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{
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struct publication *p = NULL;
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u32 lower = ntohl(i->lower);
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u32 upper = ntohl(i->upper);
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u32 type = ntohl(i->type);
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u32 port = ntohl(i->port);
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u32 key = ntohl(i->key);
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if (dtype == PUBLICATION) {
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p = tipc_nametbl_insert_publ(net, type, lower, upper,
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TIPC_CLUSTER_SCOPE, node,
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port, key);
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if (p) {
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tipc_node_subscribe(net, &p->binding_node, node);
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return true;
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}
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} else if (dtype == WITHDRAWAL) {
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p = tipc_nametbl_remove_publ(net, type, lower,
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upper, node, key);
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if (p) {
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tipc_node_unsubscribe(net, &p->binding_node, node);
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kfree_rcu(p, rcu);
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return true;
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}
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pr_warn_ratelimited("Failed to remove binding %u,%u from %x\n",
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type, lower, node);
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} else {
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pr_warn("Unrecognized name table message received\n");
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}
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return false;
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}
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static struct sk_buff *tipc_named_dequeue(struct sk_buff_head *namedq,
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u16 *rcv_nxt, bool *open)
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{
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struct sk_buff *skb, *tmp;
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struct tipc_msg *hdr;
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u16 seqno;
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skb_queue_walk_safe(namedq, skb, tmp) {
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skb_linearize(skb);
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hdr = buf_msg(skb);
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seqno = msg_named_seqno(hdr);
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if (msg_is_last_bulk(hdr)) {
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*rcv_nxt = seqno;
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*open = true;
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}
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if (msg_is_bulk(hdr) || msg_is_legacy(hdr)) {
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__skb_unlink(skb, namedq);
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return skb;
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}
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if (*open && (*rcv_nxt == seqno)) {
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(*rcv_nxt)++;
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__skb_unlink(skb, namedq);
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return skb;
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}
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if (less(seqno, *rcv_nxt)) {
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__skb_unlink(skb, namedq);
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kfree_skb(skb);
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continue;
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}
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}
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return NULL;
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}
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/**
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* tipc_named_rcv - process name table update messages sent by another node
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*/
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void tipc_named_rcv(struct net *net, struct sk_buff_head *namedq,
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u16 *rcv_nxt, bool *open)
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{
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struct tipc_net *tn = tipc_net(net);
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struct distr_item *item;
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struct tipc_msg *hdr;
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struct sk_buff *skb;
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u32 count, node;
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spin_lock_bh(&tn->nametbl_lock);
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while ((skb = tipc_named_dequeue(namedq, rcv_nxt, open))) {
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hdr = buf_msg(skb);
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node = msg_orignode(hdr);
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item = (struct distr_item *)msg_data(hdr);
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count = msg_data_sz(hdr) / ITEM_SIZE;
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while (count--) {
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tipc_update_nametbl(net, item, node, msg_type(hdr));
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item++;
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}
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kfree_skb(skb);
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}
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spin_unlock_bh(&tn->nametbl_lock);
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}
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/**
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* tipc_named_reinit - re-initialize local publications
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*
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* This routine is called whenever TIPC networking is enabled.
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* All name table entries published by this node are updated to reflect
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* the node's new network address.
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*/
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void tipc_named_reinit(struct net *net)
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{
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struct name_table *nt = tipc_name_table(net);
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struct tipc_net *tn = tipc_net(net);
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struct publication *publ;
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u32 self = tipc_own_addr(net);
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spin_lock_bh(&tn->nametbl_lock);
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list_for_each_entry_rcu(publ, &nt->node_scope, binding_node)
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publ->node = self;
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list_for_each_entry_rcu(publ, &nt->cluster_scope, binding_node)
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publ->node = self;
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nt->rc_dests = 0;
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spin_unlock_bh(&tn->nametbl_lock);
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}
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