Merge branch 'master' of /usr/src/ntfs-2.6/

1 files changed, 311 insertions, 0 deletions

diff --git a/net/tipc/net.c b/net/tipc/net.c
new file mode 100644
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+++ b/net/tipc/net.c
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+/*
+ * net/tipc/net.c: TIPC network routing code
+ * 
+ * Copyright (c) 1995-2006, Ericsson AB
+ * Copyright (c) 2005, 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 "bearer.h"
+#include "net.h"
+#include "zone.h"
+#include "addr.h"
+#include "name_table.h"
+#include "name_distr.h"
+#include "subscr.h"
+#include "link.h"
+#include "msg.h"
+#include "port.h"
+#include "bcast.h"
+#include "discover.h"
+#include "config.h"
+
+/* 
+ * The TIPC locking policy is designed to ensure a very fine locking
+ * granularity, permitting complete parallel access to individual
+ * port and node/link instances. The code consists of three major 
+ * locking domains, each protected with their own disjunct set of locks.
+ *
+ * 1: The routing hierarchy.
+ *    Comprises the structures 'zone', 'cluster', 'node', 'link' 
+ *    and 'bearer'. The whole hierarchy is protected by a big 
+ *    read/write lock, tipc_net_lock, to enssure that nothing is added 
+ *    or removed while code is accessing any of these structures. 
+ *    This layer must not be called from the two others while they 
+ *    hold any of their own locks.
+ *    Neither must it itself do any upcalls to the other two before
+ *    it has released tipc_net_lock and other protective locks.
+ *
+ *   Within the tipc_net_lock domain there are two sub-domains;'node' and 
+ *   'bearer', where local write operations are permitted,
+ *   provided that those are protected by individual spin_locks
+ *   per instance. Code holding tipc_net_lock(read) and a node spin_lock 
+ *   is permitted to poke around in both the node itself and its
+ *   subordinate links. I.e, it can update link counters and queues, 
+ *   change link state, send protocol messages, and alter the 
+ *   "active_links" array in the node; but it can _not_ remove a link 
+ *   or a node from the overall structure.
+ *   Correspondingly, individual bearers may change status within a 
+ *   tipc_net_lock(read), protected by an individual spin_lock ber bearer 
+ *   instance, but it needs tipc_net_lock(write) to remove/add any bearers.
+ *     
+ *
+ *  2: The transport level of the protocol. 
+ *     This consists of the structures port, (and its user level 
+ *     representations, such as user_port and tipc_sock), reference and 
+ *     tipc_user (port.c, reg.c, socket.c). 
+ *
+ *     This layer has four different locks:
+ *     - The tipc_port spin_lock. This is protecting each port instance
+ *       from parallel data access and removal. Since we can not place 
+ *       this lock in the port itself, it has been placed in the 
+ *       corresponding reference table entry, which has the same life
+ *       cycle as the module. This entry is difficult to access from 
+ *       outside the TIPC core, however, so a pointer to the lock has 
+ *       been added in the port instance, -to be used for unlocking 
+ *       only.
+ *     - A read/write lock to protect the reference table itself (teg.c). 
+ *       (Nobody is using read-only access to this, so it can just as 
+ *       well be changed to a spin_lock)
+ *     - A spin lock to protect the registry of kernel/driver users (reg.c)
+ *     - A global spin_lock (tipc_port_lock), which only task is to ensure 
+ *       consistency where more than one port is involved in an operation,
+ *       i.e., whe a port is part of a linked list of ports.
+ *       There are two such lists; 'port_list', which is used for management,
+ *       and 'wait_list', which is used to queue ports during congestion.
+ *     
+ *  3: The name table (name_table.c, name_distr.c, subscription.c)
+ *     - There is one big read/write-lock (tipc_nametbl_lock) protecting the 
+ *       overall name table structure. Nothing must be added/removed to 
+ *       this structure without holding write access to it.
+ *     - There is one local spin_lock per sub_sequence, which can be seen
+ *       as a sub-domain to the tipc_nametbl_lock domain. It is used only
+ *       for translation operations, and is needed because a translation
+ *       steps the root of the 'publication' linked list between each lookup.
+ *       This is always used within the scope of a tipc_nametbl_lock(read).
+ *     - A local spin_lock protecting the queue of subscriber events.
+*/
+
+rwlock_t tipc_net_lock = RW_LOCK_UNLOCKED;
+struct network tipc_net = { 0 };
+
+struct node *tipc_net_select_remote_node(u32 addr, u32 ref) 
+{
+        return tipc_zone_select_remote_node(tipc_net.zones[tipc_zone(addr)], addr, ref);
+}
+
+u32 tipc_net_select_router(u32 addr, u32 ref)
+{
+        return tipc_zone_select_router(tipc_net.zones[tipc_zone(addr)], addr, ref);
+}
+
+
+u32 tipc_net_next_node(u32 a)
+{
+        if (tipc_net.zones[tipc_zone(a)])
+                return tipc_zone_next_node(a);
+        return 0;
+}
+
+void tipc_net_remove_as_router(u32 router)
+{
+        u32 z_num;
+
+        for (z_num = 1; z_num <= tipc_max_zones; z_num++) {
+                if (!tipc_net.zones[z_num])
+                        continue;
+                tipc_zone_remove_as_router(tipc_net.zones[z_num], router);
+        }
+}
+
+void tipc_net_send_external_routes(u32 dest)
+{
+        u32 z_num;
+
+        for (z_num = 1; z_num <= tipc_max_zones; z_num++) {
+                if (tipc_net.zones[z_num])
+                        tipc_zone_send_external_routes(tipc_net.zones[z_num], dest);
+        }
+}
+
+static int net_init(void)
+{
+        u32 sz = sizeof(struct _zone *) * (tipc_max_zones + 1);
+
+        memset(&tipc_net, 0, sizeof(tipc_net));
+        tipc_net.zones = (struct _zone **)kmalloc(sz, GFP_ATOMIC);
+        if (!tipc_net.zones) {
+                return -ENOMEM;
+        }
+        memset(tipc_net.zones, 0, sz);
+        return TIPC_OK;
+}
+
+static void net_stop(void)
+{
+        u32 z_num;
+
+        if (!tipc_net.zones)
+                return;
+
+        for (z_num = 1; z_num <= tipc_max_zones; z_num++) {
+                tipc_zone_delete(tipc_net.zones[z_num]);
+        }
+        kfree(tipc_net.zones);
+        tipc_net.zones = 0;
+}
+
+static void net_route_named_msg(struct sk_buff *buf)
+{
+        struct tipc_msg *msg = buf_msg(buf);
+        u32 dnode;
+        u32 dport;
+
+        if (!msg_named(msg)) {
+                msg_dbg(msg, "tipc_net->drop_nam:");
+                buf_discard(buf);
+                return;
+        }
+
+        dnode = addr_domain(msg_lookup_scope(msg));
+        dport = tipc_nametbl_translate(msg_nametype(msg), msg_nameinst(msg), &dnode);
+        dbg("tipc_net->lookup<%u,%u>-><%u,%x>\n",
+            msg_nametype(msg), msg_nameinst(msg), dport, dnode);
+        if (dport) {
+                msg_set_destnode(msg, dnode);
+                msg_set_destport(msg, dport);
+                tipc_net_route_msg(buf);
+                return;
+        }
+        msg_dbg(msg, "tipc_net->rej:NO NAME: ");
+        tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
+}
+
+void tipc_net_route_msg(struct sk_buff *buf)
+{
+        struct tipc_msg *msg;
+        u32 dnode;
+
+        if (!buf)
+                return;
+        msg = buf_msg(buf);
+
+        msg_incr_reroute_cnt(msg);
+        if (msg_reroute_cnt(msg) > 6) {
+                if (msg_errcode(msg)) {
+                        msg_dbg(msg, "NET>DISC>:");
+                        buf_discard(buf);
+                } else {
+                        msg_dbg(msg, "NET>REJ>:");
+                        tipc_reject_msg(buf, msg_destport(msg) ? 
+                                        TIPC_ERR_NO_PORT : TIPC_ERR_NO_NAME);
+                }
+                return;
+        }
+
+        msg_dbg(msg, "tipc_net->rout: ");
+
+        /* Handle message for this node */
+        dnode = msg_short(msg) ? tipc_own_addr : msg_destnode(msg);
+        if (in_scope(dnode, tipc_own_addr)) {
+                if (msg_isdata(msg)) {
+                        if (msg_mcast(msg)) 
+                                tipc_port_recv_mcast(buf, NULL);
+                        else if (msg_destport(msg))
+                                tipc_port_recv_msg(buf);
+                        else
+                                net_route_named_msg(buf);
+                        return;
+                }
+                switch (msg_user(msg)) {
+                case ROUTE_DISTRIBUTOR:
+                        tipc_cltr_recv_routing_table(buf);
+                        break;
+                case NAME_DISTRIBUTOR:
+                        tipc_named_recv(buf);
+                        break;
+                case CONN_MANAGER:
+                        tipc_port_recv_proto_msg(buf);
+                        break;
+                default:
+                        msg_dbg(msg,"DROP/NET/<REC<");
+                        buf_discard(buf);
+                }
+                return;
+        }
+
+        /* Handle message for another node */
+        msg_dbg(msg, "NET>SEND>: ");
+        tipc_link_send(buf, dnode, msg_link_selector(msg));
+}
+
+int tipc_net_start(void)
+{
+        char addr_string[16];
+        int res;
+
+        if (tipc_mode != TIPC_NODE_MODE)
+                return -ENOPROTOOPT;
+
+        tipc_mode = TIPC_NET_MODE;
+        tipc_named_reinit();
+        tipc_port_reinit();
+
+        if ((res = tipc_bearer_init()) ||
+            (res = net_init()) ||
+            (res = tipc_cltr_init()) ||
+            (res = tipc_bclink_init())) {
+                return res;
+        }
+        tipc_subscr_stop();
+        tipc_cfg_stop();
+        tipc_k_signal((Handler)tipc_subscr_start, 0);
+        tipc_k_signal((Handler)tipc_cfg_init, 0);
+        info("Started in network mode\n");
+        info("Own node address %s, network identity %u\n",
+             addr_string_fill(addr_string, tipc_own_addr), tipc_net_id);
+        return TIPC_OK;
+}
+
+void tipc_net_stop(void)
+{
+        if (tipc_mode != TIPC_NET_MODE)
+                return;
+        write_lock_bh(&tipc_net_lock);
+        tipc_bearer_stop();
+        tipc_mode = TIPC_NODE_MODE;
+        tipc_bclink_stop();
+        net_stop();
+        write_unlock_bh(&tipc_net_lock);
+        info("Left network mode \n");
+}
+