2 * net/tipc/name_distr.c: TIPC name distribution code
4 * Copyright (c) 2000-2006, Ericsson AB
5 * Copyright (c) 2005, Wind River Systems
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9 * modification, are permitted provided that the following conditions are met:
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17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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42 #include "name_distr.h"
45 #define DBG_OUTPUT NULL
47 #define ITEM_SIZE sizeof(struct distr_item)
50 * struct distr_item - publication info distributed to other nodes
51 * @type: name sequence type
52 * @lower: name sequence lower bound
53 * @upper: name sequence upper bound
54 * @ref: publishing port reference
55 * @key: publication key
57 * ===> All fields are stored in network byte order. <===
59 * First 3 fields identify (name or) name sequence being published.
60 * Reference field uniquely identifies port that published name sequence.
61 * Key field uniquely identifies publication, in the event a port has
62 * multiple publications of the same name sequence.
64 * Note: There is no field that identifies the publishing node because it is
65 * the same for all items contained within a publication message.
77 * List of externally visible publications by this node --
78 * that is, all publications having scope > TIPC_NODE_SCOPE.
81 static LIST_HEAD(publ_root
);
82 static u32 publ_cnt
= 0;
85 * publ_to_item - add publication info to a publication message
88 static void publ_to_item(struct distr_item
*i
, struct publication
*p
)
90 i
->type
= htonl(p
->type
);
91 i
->lower
= htonl(p
->lower
);
92 i
->upper
= htonl(p
->upper
);
93 i
->ref
= htonl(p
->ref
);
94 i
->key
= htonl(p
->key
);
95 dbg("publ_to_item: %u, %u, %u\n", p
->type
, p
->lower
, p
->upper
);
99 * named_prepare_buf - allocate & initialize a publication message
102 static struct sk_buff
*named_prepare_buf(u32 type
, u32 size
, u32 dest
)
104 struct sk_buff
*buf
= buf_acquire(LONG_H_SIZE
+ size
);
105 struct tipc_msg
*msg
;
109 msg_init(msg
, NAME_DISTRIBUTOR
, type
, TIPC_OK
,
111 msg_set_size(msg
, LONG_H_SIZE
+ size
);
117 * named_publish - tell other nodes about a new publication by this node
120 void named_publish(struct publication
*publ
)
123 struct distr_item
*item
;
125 list_add(&publ
->local_list
, &publ_root
);
128 buf
= named_prepare_buf(PUBLICATION
, ITEM_SIZE
, 0);
130 warn("Memory squeeze; failed to distribute publication\n");
134 item
= (struct distr_item
*)msg_data(buf_msg(buf
));
135 publ_to_item(item
, publ
);
136 dbg("named_withdraw: broadcasting publish msg\n");
137 cluster_broadcast(buf
);
141 * named_withdraw - tell other nodes about a withdrawn publication by this node
144 void named_withdraw(struct publication
*publ
)
147 struct distr_item
*item
;
149 list_del(&publ
->local_list
);
152 buf
= named_prepare_buf(WITHDRAWAL
, ITEM_SIZE
, 0);
154 warn("Memory squeeze; failed to distribute withdrawal\n");
158 item
= (struct distr_item
*)msg_data(buf_msg(buf
));
159 publ_to_item(item
, publ
);
160 dbg("named_withdraw: broadcasting withdraw msg\n");
161 cluster_broadcast(buf
);
165 * named_node_up - tell specified node about all publications by this node
168 void named_node_up(unsigned long node
)
170 struct publication
*publ
;
171 struct distr_item
*item
= 0;
172 struct sk_buff
*buf
= 0;
177 assert(in_own_cluster(node
));
178 read_lock_bh(&nametbl_lock
);
179 max_item_buf
= TIPC_MAX_USER_MSG_SIZE
/ ITEM_SIZE
;
180 max_item_buf
*= ITEM_SIZE
;
181 rest
= publ_cnt
* ITEM_SIZE
;
183 list_for_each_entry(publ
, &publ_root
, local_list
) {
185 left
= (rest
<= max_item_buf
) ? rest
: max_item_buf
;
187 buf
= named_prepare_buf(PUBLICATION
, left
, node
);
189 warn("Memory Squeeze; could not send publication\n");
192 item
= (struct distr_item
*)msg_data(buf_msg(buf
));
194 publ_to_item(item
, publ
);
198 msg_set_link_selector(buf_msg(buf
), node
);
199 dbg("named_node_up: sending publish msg to "
200 "<%u.%u.%u>\n", tipc_zone(node
),
201 tipc_cluster(node
), tipc_node(node
));
202 link_send(buf
, node
, node
);
207 read_unlock_bh(&nametbl_lock
);
211 * node_is_down - remove publication associated with a failed node
213 * Invoked for each publication issued by a newly failed node.
214 * Removes publication structure from name table & deletes it.
215 * In rare cases the link may have come back up again when this
216 * function is called, and we have two items representing the same
217 * publication. Nudge this item's key to distinguish it from the other.
218 * (Note: Publication's node subscription is already unsubscribed.)
221 static void node_is_down(struct publication
*publ
)
223 struct publication
*p
;
224 write_lock_bh(&nametbl_lock
);
225 dbg("node_is_down: withdrawing %u, %u, %u\n",
226 publ
->type
, publ
->lower
, publ
->upper
);
227 publ
->key
+= 1222345;
228 p
= nametbl_remove_publ(publ
->type
, publ
->lower
,
229 publ
->node
, publ
->ref
, publ
->key
);
231 write_unlock_bh(&nametbl_lock
);
237 * named_recv - process name table update message sent by another node
240 void named_recv(struct sk_buff
*buf
)
242 struct publication
*publ
;
243 struct tipc_msg
*msg
= buf_msg(buf
);
244 struct distr_item
*item
= (struct distr_item
*)msg_data(msg
);
245 u32 count
= msg_data_sz(msg
) / ITEM_SIZE
;
247 write_lock_bh(&nametbl_lock
);
249 if (msg_type(msg
) == PUBLICATION
) {
250 dbg("named_recv: got publication for %u, %u, %u\n",
251 ntohl(item
->type
), ntohl(item
->lower
),
253 publ
= nametbl_insert_publ(ntohl(item
->type
),
261 nodesub_subscribe(&publ
->subscr
,
264 (net_ev_handler
)node_is_down
);
266 } else if (msg_type(msg
) == WITHDRAWAL
) {
267 dbg("named_recv: got withdrawl for %u, %u, %u\n",
268 ntohl(item
->type
), ntohl(item
->lower
),
270 publ
= nametbl_remove_publ(ntohl(item
->type
),
277 nodesub_unsubscribe(&publ
->subscr
);
281 warn("named_recv: unknown msg\n");
285 write_unlock_bh(&nametbl_lock
);
290 * named_reinit - re-initialize local publication list
292 * This routine is called whenever TIPC networking is (re)enabled.
293 * All existing publications by this node that have "cluster" or "zone" scope
294 * are updated to reflect the node's current network address.
295 * (If the node's address is unchanged, the update loop terminates immediately.)
298 void named_reinit(void)
300 struct publication
*publ
;
302 write_lock_bh(&nametbl_lock
);
303 list_for_each_entry(publ
, &publ_root
, local_list
) {
304 if (publ
->node
== tipc_own_addr
)
306 publ
->node
= tipc_own_addr
;
308 write_unlock_bh(&nametbl_lock
);