| /* |
| * net/tipc/name_distr.c: TIPC name distribution code |
| * |
| * Copyright (c) 2000-2006, Ericsson AB |
| * Copyright (c) 2005, 2010-2011, Wind River Systems |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the names of the copyright holders nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * Alternatively, this software may be distributed under the terms of the |
| * GNU General Public License ("GPL") version 2 as published by the Free |
| * Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "core.h" |
| #include "link.h" |
| #include "name_distr.h" |
| |
| #define ITEM_SIZE sizeof(struct distr_item) |
| |
| /** |
| * struct distr_item - publication info distributed to other nodes |
| * @type: name sequence type |
| * @lower: name sequence lower bound |
| * @upper: name sequence upper bound |
| * @ref: publishing port reference |
| * @key: publication key |
| * |
| * ===> All fields are stored in network byte order. <=== |
| * |
| * First 3 fields identify (name or) name sequence being published. |
| * Reference field uniquely identifies port that published name sequence. |
| * Key field uniquely identifies publication, in the event a port has |
| * multiple publications of the same name sequence. |
| * |
| * Note: There is no field that identifies the publishing node because it is |
| * the same for all items contained within a publication message. |
| */ |
| |
| struct distr_item { |
| __be32 type; |
| __be32 lower; |
| __be32 upper; |
| __be32 ref; |
| __be32 key; |
| }; |
| |
| /** |
| * struct publ_list - list of publications made by this node |
| * @list: circular list of publications |
| * @list_size: number of entries in list |
| */ |
| struct publ_list { |
| struct list_head list; |
| u32 size; |
| }; |
| |
| static struct publ_list publ_zone = { |
| .list = LIST_HEAD_INIT(publ_zone.list), |
| .size = 0, |
| }; |
| |
| static struct publ_list publ_cluster = { |
| .list = LIST_HEAD_INIT(publ_cluster.list), |
| .size = 0, |
| }; |
| |
| static struct publ_list publ_node = { |
| .list = LIST_HEAD_INIT(publ_node.list), |
| .size = 0, |
| }; |
| |
| static struct publ_list *publ_lists[] = { |
| NULL, |
| &publ_zone, /* publ_lists[TIPC_ZONE_SCOPE] */ |
| &publ_cluster, /* publ_lists[TIPC_CLUSTER_SCOPE] */ |
| &publ_node /* publ_lists[TIPC_NODE_SCOPE] */ |
| }; |
| |
| |
| /** |
| * publ_to_item - add publication info to a publication message |
| */ |
| |
| static void publ_to_item(struct distr_item *i, struct publication *p) |
| { |
| i->type = htonl(p->type); |
| i->lower = htonl(p->lower); |
| i->upper = htonl(p->upper); |
| i->ref = htonl(p->ref); |
| i->key = htonl(p->key); |
| } |
| |
| /** |
| * named_prepare_buf - allocate & initialize a publication message |
| */ |
| |
| static struct sk_buff *named_prepare_buf(u32 type, u32 size, u32 dest) |
| { |
| struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size); |
| struct tipc_msg *msg; |
| |
| if (buf != NULL) { |
| msg = buf_msg(buf); |
| tipc_msg_init(msg, NAME_DISTRIBUTOR, type, INT_H_SIZE, dest); |
| msg_set_size(msg, INT_H_SIZE + size); |
| } |
| return buf; |
| } |
| |
| static void named_cluster_distribute(struct sk_buff *buf) |
| { |
| struct sk_buff *buf_copy; |
| struct tipc_node *n_ptr; |
| |
| list_for_each_entry(n_ptr, &tipc_node_list, list) { |
| if (tipc_node_active_links(n_ptr)) { |
| buf_copy = skb_copy(buf, GFP_ATOMIC); |
| if (!buf_copy) |
| break; |
| msg_set_destnode(buf_msg(buf_copy), n_ptr->addr); |
| tipc_link_send(buf_copy, n_ptr->addr, n_ptr->addr); |
| } |
| } |
| |
| kfree_skb(buf); |
| } |
| |
| /** |
| * tipc_named_publish - tell other nodes about a new publication by this node |
| */ |
| |
| void tipc_named_publish(struct publication *publ) |
| { |
| struct sk_buff *buf; |
| struct distr_item *item; |
| |
| list_add_tail(&publ->local_list, &publ_lists[publ->scope]->list); |
| publ_lists[publ->scope]->size++; |
| |
| if (publ->scope == TIPC_NODE_SCOPE) |
| return; |
| |
| buf = named_prepare_buf(PUBLICATION, ITEM_SIZE, 0); |
| if (!buf) { |
| warn("Publication distribution failure\n"); |
| return; |
| } |
| |
| item = (struct distr_item *)msg_data(buf_msg(buf)); |
| publ_to_item(item, publ); |
| named_cluster_distribute(buf); |
| } |
| |
| /** |
| * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node |
| */ |
| |
| void tipc_named_withdraw(struct publication *publ) |
| { |
| struct sk_buff *buf; |
| struct distr_item *item; |
| |
| list_del(&publ->local_list); |
| publ_lists[publ->scope]->size--; |
| |
| if (publ->scope == TIPC_NODE_SCOPE) |
| return; |
| |
| buf = named_prepare_buf(WITHDRAWAL, ITEM_SIZE, 0); |
| if (!buf) { |
| warn("Withdrawal distribution failure\n"); |
| return; |
| } |
| |
| item = (struct distr_item *)msg_data(buf_msg(buf)); |
| publ_to_item(item, publ); |
| named_cluster_distribute(buf); |
| } |
| |
| /* |
| * named_distribute - prepare name info for bulk distribution to another node |
| */ |
| static void named_distribute(struct list_head *message_list, u32 node, |
| struct publ_list *pls, u32 max_item_buf) |
| { |
| struct publication *publ; |
| struct sk_buff *buf = NULL; |
| struct distr_item *item = NULL; |
| u32 left = 0; |
| u32 rest = pls->size * ITEM_SIZE; |
| |
| list_for_each_entry(publ, &pls->list, local_list) { |
| if (!buf) { |
| left = (rest <= max_item_buf) ? rest : max_item_buf; |
| rest -= left; |
| buf = named_prepare_buf(PUBLICATION, left, node); |
| if (!buf) { |
| warn("Bulk publication failure\n"); |
| return; |
| } |
| item = (struct distr_item *)msg_data(buf_msg(buf)); |
| } |
| publ_to_item(item, publ); |
| item++; |
| left -= ITEM_SIZE; |
| if (!left) { |
| list_add_tail((struct list_head *)buf, message_list); |
| buf = NULL; |
| } |
| } |
| } |
| |
| /** |
| * tipc_named_node_up - tell specified node about all publications by this node |
| */ |
| |
| void tipc_named_node_up(unsigned long nodearg) |
| { |
| struct tipc_node *n_ptr; |
| struct tipc_link *l_ptr; |
| struct list_head message_list; |
| u32 node = (u32)nodearg; |
| u32 max_item_buf = 0; |
| |
| /* compute maximum amount of publication data to send per message */ |
| |
| read_lock_bh(&tipc_net_lock); |
| n_ptr = tipc_node_find(node); |
| if (n_ptr) { |
| tipc_node_lock(n_ptr); |
| l_ptr = n_ptr->active_links[0]; |
| if (l_ptr) |
| max_item_buf = ((l_ptr->max_pkt - INT_H_SIZE) / |
| ITEM_SIZE) * ITEM_SIZE; |
| tipc_node_unlock(n_ptr); |
| } |
| read_unlock_bh(&tipc_net_lock); |
| if (!max_item_buf) |
| return; |
| |
| /* create list of publication messages, then send them as a unit */ |
| |
| INIT_LIST_HEAD(&message_list); |
| |
| read_lock_bh(&tipc_nametbl_lock); |
| named_distribute(&message_list, node, &publ_cluster, max_item_buf); |
| named_distribute(&message_list, node, &publ_zone, max_item_buf); |
| read_unlock_bh(&tipc_nametbl_lock); |
| |
| tipc_link_send_names(&message_list, (u32)node); |
| } |
| |
| /** |
| * named_purge_publ - remove publication associated with a failed node |
| * |
| * Invoked for each publication issued by a newly failed node. |
| * Removes publication structure from name table & deletes it. |
| */ |
| |
| static void named_purge_publ(struct publication *publ) |
| { |
| struct publication *p; |
| |
| write_lock_bh(&tipc_nametbl_lock); |
| p = tipc_nametbl_remove_publ(publ->type, publ->lower, |
| publ->node, publ->ref, publ->key); |
| if (p) |
| tipc_nodesub_unsubscribe(&p->subscr); |
| write_unlock_bh(&tipc_nametbl_lock); |
| |
| if (p != publ) { |
| err("Unable to remove publication from failed node\n" |
| "(type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n", |
| publ->type, publ->lower, publ->node, publ->ref, publ->key); |
| } |
| |
| kfree(p); |
| } |
| |
| /** |
| * tipc_named_recv - process name table update message sent by another node |
| */ |
| |
| void tipc_named_recv(struct sk_buff *buf) |
| { |
| struct publication *publ; |
| struct tipc_msg *msg = buf_msg(buf); |
| struct distr_item *item = (struct distr_item *)msg_data(msg); |
| u32 count = msg_data_sz(msg) / ITEM_SIZE; |
| |
| write_lock_bh(&tipc_nametbl_lock); |
| while (count--) { |
| if (msg_type(msg) == PUBLICATION) { |
| publ = tipc_nametbl_insert_publ(ntohl(item->type), |
| ntohl(item->lower), |
| ntohl(item->upper), |
| TIPC_CLUSTER_SCOPE, |
| msg_orignode(msg), |
| ntohl(item->ref), |
| ntohl(item->key)); |
| if (publ) { |
| tipc_nodesub_subscribe(&publ->subscr, |
| msg_orignode(msg), |
| publ, |
| (net_ev_handler) |
| named_purge_publ); |
| } |
| } else if (msg_type(msg) == WITHDRAWAL) { |
| publ = tipc_nametbl_remove_publ(ntohl(item->type), |
| ntohl(item->lower), |
| msg_orignode(msg), |
| ntohl(item->ref), |
| ntohl(item->key)); |
| |
| if (publ) { |
| tipc_nodesub_unsubscribe(&publ->subscr); |
| kfree(publ); |
| } else { |
| err("Unable to remove publication by node 0x%x\n" |
| "(type=%u, lower=%u, ref=%u, key=%u)\n", |
| msg_orignode(msg), |
| ntohl(item->type), ntohl(item->lower), |
| ntohl(item->ref), ntohl(item->key)); |
| } |
| } else { |
| warn("Unrecognized name table message received\n"); |
| } |
| item++; |
| } |
| write_unlock_bh(&tipc_nametbl_lock); |
| kfree_skb(buf); |
| } |
| |
| /** |
| * tipc_named_reinit - re-initialize local publications |
| * |
| * This routine is called whenever TIPC networking is enabled. |
| * All name table entries published by this node are updated to reflect |
| * the node's new network address. |
| */ |
| |
| void tipc_named_reinit(void) |
| { |
| struct publication *publ; |
| int scope; |
| |
| write_lock_bh(&tipc_nametbl_lock); |
| |
| for (scope = TIPC_ZONE_SCOPE; scope <= TIPC_NODE_SCOPE; scope++) |
| list_for_each_entry(publ, &publ_lists[scope]->list, local_list) |
| publ->node = tipc_own_addr; |
| |
| write_unlock_bh(&tipc_nametbl_lock); |
| } |