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linux-next/net/tipc/config.c
Arnaldo Carvalho de Melo 27a884dc3c [SK_BUFF]: Convert skb->tail to sk_buff_data_t 
So that it is also an offset from skb->head, reduces its size from 8 to 4 bytes
on 64bit architectures, allowing us to combine the 4 bytes hole left by the
layer headers conversion, reducing struct sk_buff size to 256 bytes, i.e. 4
64byte cachelines, and since the sk_buff slab cache is SLAB_HWCACHE_ALIGN...
:-)

Many calculations that previously required that skb->{transport,network,
mac}_header be first converted to a pointer now can be done directly, being
meaningful as offsets or pointers.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-25 22:26:28 -07:00

703 lines
19 KiB
C
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/*
* net/tipc/config.c: TIPC configuration management code
*
* Copyright (c) 2002-2006, Ericsson AB
* Copyright (c) 2004-2006, 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 "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 DEFINE_SPINLOCK(config_lock);
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 tipc_cfg_link_event(u32 addr, char *name, int up)
{
/* TIPC DOESN'T HANDLE LINK EVENT SUBSCRIPTIONS AT THE MOMENT */
}
struct sk_buff *tipc_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 tipc_cfg_append_tlv(struct sk_buff *buf, int tlv_type,
void *tlv_data, int tlv_data_size)
{
struct tlv_desc *tlv = (struct tlv_desc *)skb_tail_pointer(buf);
int new_tlv_space = TLV_SPACE(tlv_data_size);
if (skb_tailroom(buf) < new_tlv_space) {
dbg("tipc_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 *tipc_cfg_reply_unsigned_type(u16 tlv_type, u32 value)
{
struct sk_buff *buf;
__be32 value_net;
buf = tipc_cfg_reply_alloc(TLV_SPACE(sizeof(value)));
if (buf) {
value_net = htonl(value);
tipc_cfg_append_tlv(buf, tlv_type, &value_net,
sizeof(value_net));
}
return buf;
}
struct sk_buff *tipc_cfg_reply_string_type(u16 tlv_type, char *string)
{
struct sk_buff *buf;
int string_len = strlen(string) + 1;
buf = tipc_cfg_reply_alloc(TLV_SPACE(string_len));
if (buf)
tipc_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 = 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);
tipc_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 tipc_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 tipc_cfg_reply_error_string("unable to enable bearer");
return tipc_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 tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
if (tipc_disable_bearer((char *)TLV_DATA(req_tlv_area)))
return tipc_cfg_reply_error_string("unable to disable bearer");
return tipc_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 tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
addr = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
if (addr == tipc_own_addr)
return tipc_cfg_reply_none();
if (!tipc_addr_node_valid(addr))
return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
" (node address)");
if (tipc_mode == TIPC_NET_MODE)
return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
" (cannot change node address once assigned)");
tipc_own_addr = addr;
/*
* Must release all spinlocks before calling start_net() because
* Linux version of TIPC calls eth_media_start() which calls
* register_netdevice_notifier() which may block!
*
* Temporarily releasing the lock should be harmless for non-Linux TIPC,
* but Linux version of eth_media_start() should really be reworked
* so that it can be called with spinlocks held.
*/
spin_unlock_bh(&config_lock);
tipc_core_start_net();
spin_lock_bh(&config_lock);
return tipc_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 tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
tipc_remote_management = (value != 0);
return tipc_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 tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
if (value != delimit(value, 1, 65535))
return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
" (max publications must be 1-65535)");
tipc_max_publications = value;
return tipc_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 tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
if (value != delimit(value, 1, 65535))
return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
" (max subscriptions must be 1-65535");
tipc_max_subscriptions = value;
return tipc_cfg_reply_none();
}
static struct sk_buff *cfg_set_max_ports(void)
{
u32 value;
if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
if (value == tipc_max_ports)
return tipc_cfg_reply_none();
if (value != delimit(value, 127, 65535))
return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
" (max ports must be 127-65535)");
if (tipc_mode != TIPC_NOT_RUNNING)
return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
" (cannot change max ports while TIPC is active)");
tipc_max_ports = value;
return tipc_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 tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
if (value == tipc_max_zones)
return tipc_cfg_reply_none();
if (value != delimit(value, 1, 255))
return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
" (max zones must be 1-255)");
if (tipc_mode == TIPC_NET_MODE)
return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
" (cannot change max zones once TIPC has joined a network)");
tipc_max_zones = value;
return tipc_cfg_reply_none();
}
static struct sk_buff *cfg_set_max_clusters(void)
{
u32 value;
if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
if (value != delimit(value, 1, 1))
return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
" (max clusters fixed at 1)");
return tipc_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 tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
if (value == tipc_max_nodes)
return tipc_cfg_reply_none();
if (value != delimit(value, 8, 2047))
return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
" (max nodes must be 8-2047)");
if (tipc_mode == TIPC_NET_MODE)
return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
" (cannot change max nodes once TIPC has joined a network)");
tipc_max_nodes = value;
return tipc_cfg_reply_none();
}
static struct sk_buff *cfg_set_max_slaves(void)
{
u32 value;
if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
if (value != 0)
return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
" (max secondary nodes fixed at 0)");
return tipc_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 tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
if (value == tipc_net_id)
return tipc_cfg_reply_none();
if (value != delimit(value, 1, 9999))
return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
" (network id must be 1-9999)");
if (tipc_mode == TIPC_NET_MODE)
return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
" (cannot change network id once TIPC has joined a network)");
tipc_net_id = value;
return tipc_cfg_reply_none();
}
struct sk_buff *tipc_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 = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
" (cannot be done remotely)");
goto exit;
} else if (!tipc_remote_management) {
rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
goto exit;
}
else if (cmd >= 0x4000) {
u32 domain = 0;
if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
(domain != orig_node)) {
rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
goto exit;
}
}
/* Call appropriate processing routine */
switch (cmd) {
case TIPC_CMD_NOOP:
rep_tlv_buf = tipc_cfg_reply_none();
break;
case TIPC_CMD_GET_NODES:
rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
break;
case TIPC_CMD_GET_LINKS:
rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
break;
case TIPC_CMD_SHOW_LINK_STATS:
rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
break;
case TIPC_CMD_RESET_LINK_STATS:
rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
break;
case TIPC_CMD_SHOW_NAME_TABLE:
rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
break;
case TIPC_CMD_GET_BEARER_NAMES:
rep_tlv_buf = tipc_bearer_get_names();
break;
case TIPC_CMD_GET_MEDIA_NAMES:
rep_tlv_buf = tipc_media_get_names();
break;
case TIPC_CMD_SHOW_PORTS:
rep_tlv_buf = tipc_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 = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED);
break;
#endif
case TIPC_CMD_SET_LOG_SIZE:
rep_tlv_buf = tipc_log_resize(req_tlv_area, req_tlv_space);
break;
case TIPC_CMD_DUMP_LOG:
rep_tlv_buf = tipc_log_dump();
break;
case TIPC_CMD_SET_LINK_TOL:
case TIPC_CMD_SET_LINK_PRI:
case TIPC_CMD_SET_LINK_WINDOW:
rep_tlv_buf = tipc_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 = tipc_cfg_reply_unsigned(tipc_remote_management);
break;
case TIPC_CMD_GET_MAX_PORTS:
rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
break;
case TIPC_CMD_GET_MAX_PUBL:
rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_publications);
break;
case TIPC_CMD_GET_MAX_SUBSCR:
rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_subscriptions);
break;
case TIPC_CMD_GET_MAX_ZONES:
rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_zones);
break;
case TIPC_CMD_GET_MAX_CLUSTERS:
rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_clusters);
break;
case TIPC_CMD_GET_MAX_NODES:
rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_nodes);
break;
case TIPC_CMD_GET_MAX_SLAVES:
rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_slaves);
break;
case TIPC_CMD_GET_NETID:
rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
break;
default:
rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
" (unknown command)");
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("Invalid configuration message discarded\n");
return;
}
/* Generate reply for request (if can't, return request) */
rep_buf = tipc_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 tipc_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, NULL, NULL);
if (res)
goto failed;
res = tipc_createport(mng.user_ref, NULL, 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 = tipc_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 tipc_cfg_stop(void)
{
if (mng.user_ref) {
tipc_detach(mng.user_ref);
mng.user_ref = 0;
}
}
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