2 * net/tipc/name_distr.c: TIPC name distribution code
4 * Copyright (c) 2003-2005, Ericsson Research Canada
5 * Copyright (c) 2005, Wind River Systems
6 * Copyright (c) 2005-2006, Ericsson AB
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10 * modification, are permitted provided that the following conditions are met:
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13 * list of conditions and the following disclaimer.
14 * Redistributions in binary form must reproduce the above copyright notice,
15 * this list of conditions and the following disclaimer in the documentation
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19 * software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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39 #include "name_distr.h"
42 #define DBG_OUTPUT NULL
44 #define ITEM_SIZE sizeof(struct distr_item)
47 * struct distr_item - publication info distributed to other nodes
48 * @type: name sequence type
49 * @lower: name sequence lower bound
50 * @upper: name sequence upper bound
51 * @ref: publishing port reference
52 * @key: publication key
54 * ===> All fields are stored in network byte order. <===
56 * First 3 fields identify (name or) name sequence being published.
57 * Reference field uniquely identifies port that published name sequence.
58 * Key field uniquely identifies publication, in the event a port has
59 * multiple publications of the same name sequence.
61 * Note: There is no field that identifies the publishing node because it is
62 * the same for all items contained within a publication message.
74 * List of externally visible publications by this node --
75 * that is, all publications having scope > TIPC_NODE_SCOPE.
78 static LIST_HEAD(publ_root
);
79 static u32 publ_cnt
= 0;
82 * publ_to_item - add publication info to a publication message
85 static void publ_to_item(struct distr_item
*i
, struct publication
*p
)
87 i
->type
= htonl(p
->type
);
88 i
->lower
= htonl(p
->lower
);
89 i
->upper
= htonl(p
->upper
);
90 i
->ref
= htonl(p
->ref
);
91 i
->key
= htonl(p
->key
);
92 dbg("publ_to_item: %u, %u, %u\n", p
->type
, p
->lower
, p
->upper
);
96 * named_prepare_buf - allocate & initialize a publication message
99 static struct sk_buff
*named_prepare_buf(u32 type
, u32 size
, u32 dest
)
101 struct sk_buff
*buf
= buf_acquire(LONG_H_SIZE
+ size
);
102 struct tipc_msg
*msg
;
106 msg_init(msg
, NAME_DISTRIBUTOR
, type
, TIPC_OK
,
108 msg_set_size(msg
, LONG_H_SIZE
+ size
);
114 * named_publish - tell other nodes about a new publication by this node
117 void named_publish(struct publication
*publ
)
120 struct distr_item
*item
;
122 list_add(&publ
->local_list
, &publ_root
);
125 buf
= named_prepare_buf(PUBLICATION
, ITEM_SIZE
, 0);
127 warn("Memory squeeze; failed to distribute publication\n");
131 item
= (struct distr_item
*)msg_data(buf_msg(buf
));
132 publ_to_item(item
, publ
);
133 dbg("named_withdraw: broadcasting publish msg\n");
134 cluster_broadcast(buf
);
138 * named_withdraw - tell other nodes about a withdrawn publication by this node
141 void named_withdraw(struct publication
*publ
)
144 struct distr_item
*item
;
146 list_del(&publ
->local_list
);
149 buf
= named_prepare_buf(WITHDRAWAL
, ITEM_SIZE
, 0);
151 warn("Memory squeeze; failed to distribute withdrawal\n");
155 item
= (struct distr_item
*)msg_data(buf_msg(buf
));
156 publ_to_item(item
, publ
);
157 dbg("named_withdraw: broadcasting withdraw msg\n");
158 cluster_broadcast(buf
);
162 * named_node_up - tell specified node about all publications by this node
165 void named_node_up(unsigned long node
)
167 struct publication
*publ
;
168 struct distr_item
*item
= 0;
169 struct sk_buff
*buf
= 0;
174 assert(in_own_cluster(node
));
175 read_lock_bh(&nametbl_lock
);
176 max_item_buf
= TIPC_MAX_USER_MSG_SIZE
/ ITEM_SIZE
;
177 max_item_buf
*= ITEM_SIZE
;
178 rest
= publ_cnt
* ITEM_SIZE
;
180 list_for_each_entry(publ
, &publ_root
, local_list
) {
182 left
= (rest
<= max_item_buf
) ? rest
: max_item_buf
;
184 buf
= named_prepare_buf(PUBLICATION
, left
, node
);
186 warn("Memory Squeeze; could not send publication\n");
189 item
= (struct distr_item
*)msg_data(buf_msg(buf
));
191 publ_to_item(item
, publ
);
195 msg_set_link_selector(buf_msg(buf
), node
);
196 dbg("named_node_up: sending publish msg to "
197 "<%u.%u.%u>\n", tipc_zone(node
),
198 tipc_cluster(node
), tipc_node(node
));
199 link_send(buf
, node
, node
);
204 read_unlock_bh(&nametbl_lock
);
208 * node_is_down - remove publication associated with a failed node
210 * Invoked for each publication issued by a newly failed node.
211 * Removes publication structure from name table & deletes it.
212 * In rare cases the link may have come back up again when this
213 * function is called, and we have two items representing the same
214 * publication. Nudge this item's key to distinguish it from the other.
215 * (Note: Publication's node subscription is already unsubscribed.)
218 static void node_is_down(struct publication
*publ
)
220 struct publication
*p
;
221 write_lock_bh(&nametbl_lock
);
222 dbg("node_is_down: withdrawing %u, %u, %u\n",
223 publ
->type
, publ
->lower
, publ
->upper
);
224 publ
->key
+= 1222345;
225 p
= nametbl_remove_publ(publ
->type
, publ
->lower
,
226 publ
->node
, publ
->ref
, publ
->key
);
228 write_unlock_bh(&nametbl_lock
);
234 * named_recv - process name table update message sent by another node
237 void named_recv(struct sk_buff
*buf
)
239 struct publication
*publ
;
240 struct tipc_msg
*msg
= buf_msg(buf
);
241 struct distr_item
*item
= (struct distr_item
*)msg_data(msg
);
242 u32 count
= msg_data_sz(msg
) / ITEM_SIZE
;
244 write_lock_bh(&nametbl_lock
);
246 if (msg_type(msg
) == PUBLICATION
) {
247 dbg("named_recv: got publication for %u, %u, %u\n",
248 ntohl(item
->type
), ntohl(item
->lower
),
250 publ
= nametbl_insert_publ(ntohl(item
->type
),
258 nodesub_subscribe(&publ
->subscr
,
261 (net_ev_handler
)node_is_down
);
263 } else if (msg_type(msg
) == WITHDRAWAL
) {
264 dbg("named_recv: got withdrawl for %u, %u, %u\n",
265 ntohl(item
->type
), ntohl(item
->lower
),
267 publ
= nametbl_remove_publ(ntohl(item
->type
),
274 nodesub_unsubscribe(&publ
->subscr
);
278 warn("named_recv: unknown msg\n");
282 write_unlock_bh(&nametbl_lock
);
287 * named_reinit - re-initialize local publication list
289 * This routine is called whenever TIPC networking is (re)enabled.
290 * All existing publications by this node that have "cluster" or "zone" scope
291 * are updated to reflect the node's current network address.
292 * (If the node's address is unchanged, the update loop terminates immediately.)
295 void named_reinit(void)
297 struct publication
*publ
;
299 write_lock_bh(&nametbl_lock
);
300 list_for_each_entry(publ
, &publ_root
, local_list
) {
301 if (publ
->node
== tipc_own_addr
)
303 publ
->node
= tipc_own_addr
;
305 write_unlock_bh(&nametbl_lock
);
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