[TIPC] Initial merge

TIPC (Transparent Inter Process Communication) is a protocol designed for
intra cluster communication. For more information see
http://tipc.sourceforge.net

Signed-off-by: Per Liden <per.liden@nospam.ericsson.com>

1 files changed, 715 insertions, 0 deletions

diff --git a/net/tipc/config.c b/net/tipc/config.c
new file mode 100644
index 000000000000..0f31c342d11c
--- /dev/null
+++ b/net/tipc/config.c
@@ -0,0 +1,715 @@
+/*
+ * net/tipc/config.c: TIPC configuration management code
+ * 
+ * Copyright (c) 2003-2005, Ericsson Research Canada
+ * Copyright (c) 2004-2005, Wind River Systems
+ * Copyright (c) 2005-2006, Ericsson AB
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this 
+ * list of conditions and the following disclaimer.
+ * 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.
+ * 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.
+ *
+ * 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 "dbg.h"
+#include "bearer.h"
+#include "port.h"
+#include "link.h"
+#include "zone.h"
+#include "addr.h"
+#include "name_table.h"
+#include "node.h"
+#include "config.h"
+#include "discover.h"
+
+struct subscr_data {
+        char usr_handle[8];
+        u32 domain;
+        u32 port_ref;
+        struct list_head subd_list;
+};
+
+struct manager {
+        u32 user_ref;
+        u32 port_ref;
+        u32 subscr_ref;
+        u32 link_subscriptions;
+        struct list_head link_subscribers;
+};
+
+static struct manager mng = { 0};
+
+static spinlock_t config_lock = SPIN_LOCK_UNLOCKED;
+
+static const void *req_tlv_area;        /* request message TLV area */
+static int req_tlv_space;               /* request message TLV area size */
+static int rep_headroom;                /* reply message headroom to use */
+
+
+void cfg_link_event(u32 addr, char *name, int up)
+{
+        /* TIPC DOESN'T HANDLE LINK EVENT SUBSCRIPTIONS AT THE MOMENT */
+}
+
+
+struct sk_buff *cfg_reply_alloc(int payload_size)
+{
+        struct sk_buff *buf;
+
+        buf = alloc_skb(rep_headroom + payload_size, GFP_ATOMIC);
+        if (buf)
+                skb_reserve(buf, rep_headroom);
+        return buf;
+}
+
+int cfg_append_tlv(struct sk_buff *buf, int tlv_type, 
+                   void *tlv_data, int tlv_data_size)
+{
+        struct tlv_desc *tlv = (struct tlv_desc *)buf->tail;
+        int new_tlv_space = TLV_SPACE(tlv_data_size);
+
+        if (skb_tailroom(buf) < new_tlv_space) {
+                dbg("cfg_append_tlv unable to append TLV\n");
+                return 0;
+        }
+        skb_put(buf, new_tlv_space);
+        tlv->tlv_type = htons(tlv_type);
+        tlv->tlv_len  = htons(TLV_LENGTH(tlv_data_size));
+        if (tlv_data_size && tlv_data)
+                memcpy(TLV_DATA(tlv), tlv_data, tlv_data_size);
+        return 1;
+}
+
+struct sk_buff *cfg_reply_unsigned_type(u16 tlv_type, u32 value)
+{
+        struct sk_buff *buf;
+        u32 value_net;
+
+        buf = cfg_reply_alloc(TLV_SPACE(sizeof(value)));
+        if (buf) {
+                value_net = htonl(value);
+                cfg_append_tlv(buf, tlv_type, &value_net, 
+                               sizeof(value_net));
+        }
+        return buf;
+}
+
+struct sk_buff *cfg_reply_string_type(u16 tlv_type, char *string)
+{
+        struct sk_buff *buf;
+        int string_len = strlen(string) + 1;
+
+        buf = cfg_reply_alloc(TLV_SPACE(string_len));
+        if (buf)
+                cfg_append_tlv(buf, tlv_type, string, string_len);
+        return buf;
+}
+
+
+
+
+#if 0
+
+/* Now obsolete code for handling commands not yet implemented the new way */
+
+int tipc_cfg_cmd(const struct tipc_cmd_msg * msg,
+                 char *data,
+                 u32 sz,
+                 u32 *ret_size,
+                 struct tipc_portid *orig)
+{
+        int rv = -EINVAL;
+        u32 cmd = msg->cmd;
+
+        *ret_size = 0;
+        switch (cmd) {
+        case TIPC_REMOVE_LINK:
+        case TIPC_CMD_BLOCK_LINK:
+        case TIPC_CMD_UNBLOCK_LINK:
+                if (!cfg_check_connection(orig))
+                        rv = link_control(msg->argv.link_name, msg->cmd, 0);
+                break;
+        case TIPC_ESTABLISH:
+                {
+                        int connected;
+
+                        tipc_isconnected(mng.conn_port_ref, &connected);
+                        if (connected || !orig) {
+                                rv = TIPC_FAILURE;
+                                break;
+                        }
+                        rv = tipc_connect2port(mng.conn_port_ref, orig);
+                        if (rv == TIPC_OK)
+                                orig = 0;
+                        break;
+                }
+        case TIPC_GET_PEER_ADDRESS:
+                *ret_size = link_peer_addr(msg->argv.link_name, data, sz);
+                break;
+        case TIPC_GET_ROUTES:
+                rv = TIPC_OK;
+                break;
+        default: {}
+        }
+        if (*ret_size)
+                rv = TIPC_OK;
+        return rv;
+}
+
+static void cfg_cmd_event(struct tipc_cmd_msg *msg,
+                          char *data,
+                          u32 sz,        
+                          struct tipc_portid const *orig)
+{
+        int rv = -EINVAL;
+        struct tipc_cmd_result_msg rmsg;
+        struct iovec msg_sect[2];
+        int *arg;
+
+        msg->cmd = ntohl(msg->cmd);
+
+        cfg_prepare_res_msg(msg->cmd, msg->usr_handle, rv, &rmsg, msg_sect, 
+                            data, 0);
+        if (ntohl(msg->magic) != TIPC_MAGIC)
+                goto exit;
+
+        switch (msg->cmd) {
+        case TIPC_CREATE_LINK:
+                if (!cfg_check_connection(orig))
+                        rv = disc_create_link(&msg->argv.create_link);
+                break;
+        case TIPC_LINK_SUBSCRIBE:
+                {
+                        struct subscr_data *sub;
+
+                        if (mng.link_subscriptions > 64)
+                                break;
+                        sub = (struct subscr_data *)kmalloc(sizeof(*sub),
+                                                            GFP_ATOMIC);
+                        if (sub == NULL) {
+                                warn("Memory squeeze; dropped remote link subscription\n");
+                                break;
+                        }
+                        INIT_LIST_HEAD(&sub->subd_list);
+                        tipc_createport(mng.user_ref,
+                                        (void *)sub,
+                                        TIPC_HIGH_IMPORTANCE,
+                                        0,
+                                        0,
+                                        (tipc_conn_shutdown_event)cfg_linksubscr_cancel,
+                                        0,
+                                        0,
+                                        (tipc_conn_msg_event)cfg_linksubscr_cancel,
+                                        0,
+                                        &sub->port_ref);
+                        if (!sub->port_ref) {
+                                kfree(sub);
+                                break;
+                        }
+                        memcpy(sub->usr_handle,msg->usr_handle,
+                               sizeof(sub->usr_handle));
+                        sub->domain = msg->argv.domain;
+                        list_add_tail(&sub->subd_list, &mng.link_subscribers);
+                        tipc_connect2port(sub->port_ref, orig);
+                        rmsg.retval = TIPC_OK;
+                        tipc_send(sub->port_ref, 2u, msg_sect);
+                        mng.link_subscriptions++;
+                        return;
+                }
+        default:
+                rv = tipc_cfg_cmd(msg, data, sz, (u32 *)&msg_sect[1].iov_len, orig);
+        }
+        exit:
+        rmsg.result_len = htonl(msg_sect[1].iov_len);
+        rmsg.retval = htonl(rv);
+        cfg_respond(msg_sect, 2u, orig);
+}
+#endif
+
+static struct sk_buff *cfg_enable_bearer(void)
+{
+        struct tipc_bearer_config *args;
+
+        if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_CONFIG))
+                return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
+
+        args = (struct tipc_bearer_config *)TLV_DATA(req_tlv_area);
+        if (tipc_enable_bearer(args->name,
+                               ntohl(args->detect_scope),
+                               ntohl(args->priority)))
+                return cfg_reply_error_string("unable to enable bearer");
+
+        return cfg_reply_none();
+}
+
+static struct sk_buff *cfg_disable_bearer(void)
+{
+        if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_NAME))
+                return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
+
+        if (tipc_disable_bearer((char *)TLV_DATA(req_tlv_area)))
+                return cfg_reply_error_string("unable to disable bearer");
+
+        return cfg_reply_none();
+}
+
+static struct sk_buff *cfg_set_own_addr(void)
+{
+        u32 addr;
+
+        if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
+                return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
+
+        addr = *(u32 *)TLV_DATA(req_tlv_area);
+        addr = ntohl(addr);
+        if (addr == tipc_own_addr)
+                return cfg_reply_none();
+        if (!addr_node_valid(addr))
+                return cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
+                                              " (node address)");
+        if (tipc_own_addr)
+                return cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
+                                              " (cannot change node address once assigned)");
+
+        spin_unlock_bh(&config_lock);
+        stop_net();
+        tipc_own_addr = addr;
+        start_net();
+        spin_lock_bh(&config_lock);
+        return cfg_reply_none();
+}
+
+static struct sk_buff *cfg_set_remote_mng(void)
+{
+        u32 value;
+
+        if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
+                return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
+
+        value = *(u32 *)TLV_DATA(req_tlv_area);
+        value = ntohl(value);
+        tipc_remote_management = (value != 0);
+        return cfg_reply_none();
+}
+
+static struct sk_buff *cfg_set_max_publications(void)
+{
+        u32 value;
+
+        if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
+                return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
+
+        value = *(u32 *)TLV_DATA(req_tlv_area);
+        value = ntohl(value);
+        if (value != delimit(value, 1, 65535))
+                return cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
+                                              " (max publications must be 1-65535)");
+        tipc_max_publications = value;
+        return cfg_reply_none();
+}
+
+static struct sk_buff *cfg_set_max_subscriptions(void)
+{
+        u32 value;
+
+        if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
+                return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
+
+        value = *(u32 *)TLV_DATA(req_tlv_area);
+        value = ntohl(value);
+        if (value != delimit(value, 1, 65535))
+                return cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
+                                              " (max subscriptions must be 1-65535");
+        tipc_max_subscriptions = value;
+        return cfg_reply_none();
+}
+
+static struct sk_buff *cfg_set_max_ports(void)
+{
+        int orig_mode;
+        u32 value;
+
+        if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
+                return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
+        value = *(u32 *)TLV_DATA(req_tlv_area);
+        value = ntohl(value);
+        if (value != delimit(value, 127, 65535))
+                return cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
+                                              " (max ports must be 127-65535)");
+
+        if (value == tipc_max_ports)
+                return cfg_reply_none();
+
+        if (atomic_read(&tipc_user_count) > 2)
+                return cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
+                                              " (cannot change max ports while TIPC users exist)");
+
+        spin_unlock_bh(&config_lock);
+        orig_mode = tipc_get_mode();
+        if (orig_mode == TIPC_NET_MODE)
+                stop_net();
+        stop_core();
+        tipc_max_ports = value;
+        start_core();
+        if (orig_mode == TIPC_NET_MODE)
+                start_net();
+        spin_lock_bh(&config_lock);
+        return cfg_reply_none();
+}
+
+static struct sk_buff *set_net_max(int value, int *parameter)
+{
+        int orig_mode;
+
+        if (value != *parameter) {
+                orig_mode = tipc_get_mode();
+                if (orig_mode == TIPC_NET_MODE)
+                        stop_net();
+                *parameter = value;
+                if (orig_mode == TIPC_NET_MODE)
+                        start_net();
+        }
+
+        return cfg_reply_none();
+}
+
+static struct sk_buff *cfg_set_max_zones(void)
+{
+        u32 value;
+
+        if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
+                return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
+        value = *(u32 *)TLV_DATA(req_tlv_area);
+        value = ntohl(value);
+        if (value != delimit(value, 1, 255))
+                return cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
+                                              " (max zones must be 1-255)");
+        return set_net_max(value, &tipc_max_zones);
+}
+
+static struct sk_buff *cfg_set_max_clusters(void)
+{
+        u32 value;
+
+        if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
+                return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
+        value = *(u32 *)TLV_DATA(req_tlv_area);
+        value = ntohl(value);
+        if (value != 1)
+                return cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
+                                              " (max clusters fixed at 1)");
+        return cfg_reply_none();
+}
+
+static struct sk_buff *cfg_set_max_nodes(void)
+{
+        u32 value;
+
+        if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
+                return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
+        value = *(u32 *)TLV_DATA(req_tlv_area);
+        value = ntohl(value);
+        if (value != delimit(value, 8, 2047))
+                return cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
+                                              " (max nodes must be 8-2047)");
+        return set_net_max(value, &tipc_max_nodes);
+}
+
+static struct sk_buff *cfg_set_max_slaves(void)
+{
+        u32 value;
+
+        if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
+                return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
+        value = *(u32 *)TLV_DATA(req_tlv_area);
+        value = ntohl(value);
+        if (value != 0)
+                return cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
+                                              " (max secondary nodes fixed at 0)");
+        return cfg_reply_none();
+}
+
+static struct sk_buff *cfg_set_netid(void)
+{
+        u32 value;
+
+        if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
+                return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
+        value = *(u32 *)TLV_DATA(req_tlv_area);
+        value = ntohl(value);
+        if (value != delimit(value, 1, 9999))
+                return cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
+                                              " (network id must be 1-9999)");
+
+        if (tipc_own_addr)
+                return cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
+                                              " (cannot change network id once part of network)");
+        
+        return set_net_max(value, &tipc_net_id);
+}
+
+struct sk_buff *cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
+                           int request_space, int reply_headroom)
+{
+        struct sk_buff *rep_tlv_buf;
+
+        spin_lock_bh(&config_lock);
+
+        /* Save request and reply details in a well-known location */
+
+        req_tlv_area = request_area;
+        req_tlv_space = request_space;
+        rep_headroom = reply_headroom;
+
+        /* Check command authorization */
+
+        if (likely(orig_node == tipc_own_addr)) {
+                /* command is permitted */
+        } else if (cmd >= 0x8000) {
+                rep_tlv_buf = cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
+                                                     " (cannot be done remotely)");
+                goto exit;
+        } else if (!tipc_remote_management) {
+                rep_tlv_buf = cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
+                goto exit;
+        }
+        else if (cmd >= 0x4000) {
+                u32 domain = 0;
+
+                if ((nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
+                    (domain != orig_node)) {
+                        rep_tlv_buf = cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
+                        goto exit;
+                }
+        }
+
+        /* Call appropriate processing routine */
+
+        switch (cmd) {
+        case TIPC_CMD_NOOP:
+                rep_tlv_buf = cfg_reply_none();
+                break;
+        case TIPC_CMD_GET_NODES:
+                rep_tlv_buf = node_get_nodes(req_tlv_area, req_tlv_space);
+                break;
+        case TIPC_CMD_GET_LINKS:
+                rep_tlv_buf = node_get_links(req_tlv_area, req_tlv_space);
+                break;
+        case TIPC_CMD_SHOW_LINK_STATS:
+                rep_tlv_buf = link_cmd_show_stats(req_tlv_area, req_tlv_space);
+                break;
+        case TIPC_CMD_RESET_LINK_STATS:
+                rep_tlv_buf = link_cmd_reset_stats(req_tlv_area, req_tlv_space);
+                break;
+        case TIPC_CMD_SHOW_NAME_TABLE:
+                rep_tlv_buf = nametbl_get(req_tlv_area, req_tlv_space);
+                break;
+        case TIPC_CMD_GET_BEARER_NAMES:
+                rep_tlv_buf = bearer_get_names();
+                break;
+        case TIPC_CMD_GET_MEDIA_NAMES:
+                rep_tlv_buf = media_get_names();
+                break;
+        case TIPC_CMD_SHOW_PORTS:
+                rep_tlv_buf = port_get_ports();
+                break;
+#if 0
+        case TIPC_CMD_SHOW_PORT_STATS:
+                rep_tlv_buf = port_show_stats(req_tlv_area, req_tlv_space);
+                break;
+        case TIPC_CMD_RESET_PORT_STATS:
+                rep_tlv_buf = cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED);
+                break;
+#endif
+        case TIPC_CMD_SET_LOG_SIZE:
+                rep_tlv_buf = log_resize(req_tlv_area, req_tlv_space);
+                break;
+        case TIPC_CMD_DUMP_LOG:
+                rep_tlv_buf = log_dump();
+                break;
+        case TIPC_CMD_SET_LINK_TOL:
+        case TIPC_CMD_SET_LINK_PRI:
+        case TIPC_CMD_SET_LINK_WINDOW:
+                rep_tlv_buf = link_cmd_config(req_tlv_area, req_tlv_space, cmd);
+                break;
+        case TIPC_CMD_ENABLE_BEARER:
+                rep_tlv_buf = cfg_enable_bearer();
+                break;
+        case TIPC_CMD_DISABLE_BEARER:
+                rep_tlv_buf = cfg_disable_bearer();
+                break;
+        case TIPC_CMD_SET_NODE_ADDR:
+                rep_tlv_buf = cfg_set_own_addr();
+                break;
+        case TIPC_CMD_SET_REMOTE_MNG:
+                rep_tlv_buf = cfg_set_remote_mng();
+                break;
+        case TIPC_CMD_SET_MAX_PORTS:
+                rep_tlv_buf = cfg_set_max_ports();
+                break;
+        case TIPC_CMD_SET_MAX_PUBL:
+                rep_tlv_buf = cfg_set_max_publications();
+                break;
+        case TIPC_CMD_SET_MAX_SUBSCR:
+                rep_tlv_buf = cfg_set_max_subscriptions();
+                break;
+        case TIPC_CMD_SET_MAX_ZONES:
+                rep_tlv_buf = cfg_set_max_zones();
+                break;
+        case TIPC_CMD_SET_MAX_CLUSTERS:
+                rep_tlv_buf = cfg_set_max_clusters();
+                break;
+        case TIPC_CMD_SET_MAX_NODES:
+                rep_tlv_buf = cfg_set_max_nodes();
+                break;
+        case TIPC_CMD_SET_MAX_SLAVES:
+                rep_tlv_buf = cfg_set_max_slaves();
+                break;
+        case TIPC_CMD_SET_NETID:
+                rep_tlv_buf = cfg_set_netid();
+                break;
+        case TIPC_CMD_GET_REMOTE_MNG:
+                rep_tlv_buf = cfg_reply_unsigned(tipc_remote_management);
+                break;
+        case TIPC_CMD_GET_MAX_PORTS:
+                rep_tlv_buf = cfg_reply_unsigned(tipc_max_ports);
+                break;
+        case TIPC_CMD_GET_MAX_PUBL:
+                rep_tlv_buf = cfg_reply_unsigned(tipc_max_publications);
+                break;
+        case TIPC_CMD_GET_MAX_SUBSCR:
+                rep_tlv_buf = cfg_reply_unsigned(tipc_max_subscriptions);
+                break;
+        case TIPC_CMD_GET_MAX_ZONES:
+                rep_tlv_buf = cfg_reply_unsigned(tipc_max_zones);
+                break;
+        case TIPC_CMD_GET_MAX_CLUSTERS:
+                rep_tlv_buf = cfg_reply_unsigned(tipc_max_clusters);
+                break;
+        case TIPC_CMD_GET_MAX_NODES:
+                rep_tlv_buf = cfg_reply_unsigned(tipc_max_nodes);
+                break;
+        case TIPC_CMD_GET_MAX_SLAVES:
+                rep_tlv_buf = cfg_reply_unsigned(tipc_max_slaves);
+                break;
+        case TIPC_CMD_GET_NETID:
+                rep_tlv_buf = cfg_reply_unsigned(tipc_net_id);
+                break;
+        default:
+                rep_tlv_buf = NULL;
+                break;
+        }
+
+        /* Return reply buffer */
+exit:
+        spin_unlock_bh(&config_lock);
+        return rep_tlv_buf;
+}
+
+static void cfg_named_msg_event(void *userdata,
+                                u32 port_ref,
+                                struct sk_buff **buf,
+                                const unchar *msg,
+                                u32 size,
+                                u32 importance, 
+                                struct tipc_portid const *orig,
+                                struct tipc_name_seq const *dest)
+{
+        struct tipc_cfg_msg_hdr *req_hdr;
+        struct tipc_cfg_msg_hdr *rep_hdr;
+        struct sk_buff *rep_buf;
+
+        /* Validate configuration message header (ignore invalid message) */
+
+        req_hdr = (struct tipc_cfg_msg_hdr *)msg;
+        if ((size < sizeof(*req_hdr)) ||
+            (size != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
+            (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
+                warn("discarded invalid configuration message\n");
+                return;
+        }
+
+        /* Generate reply for request (if can't, return request) */
+
+        rep_buf = cfg_do_cmd(orig->node,
+                             ntohs(req_hdr->tcm_type), 
+                             msg + sizeof(*req_hdr),
+                             size - sizeof(*req_hdr),
+                             BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
+        if (rep_buf) {
+                skb_push(rep_buf, sizeof(*rep_hdr));
+                rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
+                memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
+                rep_hdr->tcm_len = htonl(rep_buf->len);
+                rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
+        } else {
+                rep_buf = *buf;
+                *buf = NULL;
+        }
+
+        /* NEED TO ADD CODE TO HANDLE FAILED SEND (SUCH AS CONGESTION) */
+        tipc_send_buf2port(port_ref, orig, rep_buf, rep_buf->len);
+}
+
+int cfg_init(void)
+{
+        struct tipc_name_seq seq;
+        int res;
+
+        memset(&mng, 0, sizeof(mng));
+        INIT_LIST_HEAD(&mng.link_subscribers);
+
+        res = tipc_attach(&mng.user_ref, 0, 0);
+        if (res)
+                goto failed;
+
+        res = tipc_createport(mng.user_ref, 0, TIPC_CRITICAL_IMPORTANCE,
+                              NULL, NULL, NULL,
+                              NULL, cfg_named_msg_event, NULL,
+                              NULL, &mng.port_ref);
+        if (res)
+                goto failed;
+
+        seq.type = TIPC_CFG_SRV;
+        seq.lower = seq.upper = tipc_own_addr;
+        res = nametbl_publish_rsv(mng.port_ref, TIPC_ZONE_SCOPE, &seq);
+        if (res)
+                goto failed;
+
+        return 0;
+
+failed:
+        err("Unable to create configuration service\n");
+        tipc_detach(mng.user_ref);
+        mng.user_ref = 0;
+        return res;
+}
+
+void cfg_stop(void)
+{
+        if (mng.user_ref) {
+                tipc_detach(mng.user_ref);
+                mng.user_ref = 0;
+        }
+}