Root/net/tipc/config.c

1/*
2 * net/tipc/config.c: TIPC configuration management code
3 *
4 * Copyright (c) 2002-2006, Ericsson AB
5 * Copyright (c) 2004-2007, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
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.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include "core.h"
38#include "dbg.h"
39#include "bearer.h"
40#include "port.h"
41#include "link.h"
42#include "zone.h"
43#include "addr.h"
44#include "name_table.h"
45#include "node.h"
46#include "config.h"
47#include "discover.h"
48
49struct subscr_data {
50    char usr_handle[8];
51    u32 domain;
52    u32 port_ref;
53    struct list_head subd_list;
54};
55
56struct manager {
57    u32 user_ref;
58    u32 port_ref;
59};
60
61static struct manager mng = { 0};
62
63static DEFINE_SPINLOCK(config_lock);
64
65static const void *req_tlv_area; /* request message TLV area */
66static int req_tlv_space; /* request message TLV area size */
67static int rep_headroom; /* reply message headroom to use */
68
69
70struct sk_buff *tipc_cfg_reply_alloc(int payload_size)
71{
72    struct sk_buff *buf;
73
74    buf = alloc_skb(rep_headroom + payload_size, GFP_ATOMIC);
75    if (buf)
76        skb_reserve(buf, rep_headroom);
77    return buf;
78}
79
80int tipc_cfg_append_tlv(struct sk_buff *buf, int tlv_type,
81            void *tlv_data, int tlv_data_size)
82{
83    struct tlv_desc *tlv = (struct tlv_desc *)skb_tail_pointer(buf);
84    int new_tlv_space = TLV_SPACE(tlv_data_size);
85
86    if (skb_tailroom(buf) < new_tlv_space) {
87        dbg("tipc_cfg_append_tlv unable to append TLV\n");
88        return 0;
89    }
90    skb_put(buf, new_tlv_space);
91    tlv->tlv_type = htons(tlv_type);
92    tlv->tlv_len = htons(TLV_LENGTH(tlv_data_size));
93    if (tlv_data_size && tlv_data)
94        memcpy(TLV_DATA(tlv), tlv_data, tlv_data_size);
95    return 1;
96}
97
98struct sk_buff *tipc_cfg_reply_unsigned_type(u16 tlv_type, u32 value)
99{
100    struct sk_buff *buf;
101    __be32 value_net;
102
103    buf = tipc_cfg_reply_alloc(TLV_SPACE(sizeof(value)));
104    if (buf) {
105        value_net = htonl(value);
106        tipc_cfg_append_tlv(buf, tlv_type, &value_net,
107                    sizeof(value_net));
108    }
109    return buf;
110}
111
112struct sk_buff *tipc_cfg_reply_string_type(u16 tlv_type, char *string)
113{
114    struct sk_buff *buf;
115    int string_len = strlen(string) + 1;
116
117    buf = tipc_cfg_reply_alloc(TLV_SPACE(string_len));
118    if (buf)
119        tipc_cfg_append_tlv(buf, tlv_type, string, string_len);
120    return buf;
121}
122
123
124#if 0
125
126/* Now obsolete code for handling commands not yet implemented the new way */
127
128/*
129 * Some of this code assumed that the manager structure contains two added
130 * fields:
131 * u32 link_subscriptions;
132 * struct list_head link_subscribers;
133 * which are currently not present. These fields may need to be re-introduced
134 * if and when support for link subscriptions is added.
135 */
136
137void tipc_cfg_link_event(u32 addr, char *name, int up)
138{
139    /* TIPC DOESN'T HANDLE LINK EVENT SUBSCRIPTIONS AT THE MOMENT */
140}
141
142int tipc_cfg_cmd(const struct tipc_cmd_msg * msg,
143         char *data,
144         u32 sz,
145         u32 *ret_size,
146         struct tipc_portid *orig)
147{
148    int rv = -EINVAL;
149    u32 cmd = msg->cmd;
150
151    *ret_size = 0;
152    switch (cmd) {
153    case TIPC_REMOVE_LINK:
154    case TIPC_CMD_BLOCK_LINK:
155    case TIPC_CMD_UNBLOCK_LINK:
156        if (!cfg_check_connection(orig))
157            rv = link_control(msg->argv.link_name, msg->cmd, 0);
158        break;
159    case TIPC_ESTABLISH:
160        {
161            int connected;
162
163            tipc_isconnected(mng.conn_port_ref, &connected);
164            if (connected || !orig) {
165                rv = TIPC_FAILURE;
166                break;
167            }
168            rv = tipc_connect2port(mng.conn_port_ref, orig);
169            if (rv == TIPC_OK)
170                orig = 0;
171            break;
172        }
173    case TIPC_GET_PEER_ADDRESS:
174        *ret_size = link_peer_addr(msg->argv.link_name, data, sz);
175        break;
176    case TIPC_GET_ROUTES:
177        rv = TIPC_OK;
178        break;
179    default: {}
180    }
181    if (*ret_size)
182        rv = TIPC_OK;
183    return rv;
184}
185
186static void cfg_cmd_event(struct tipc_cmd_msg *msg,
187              char *data,
188              u32 sz,
189              struct tipc_portid const *orig)
190{
191    int rv = -EINVAL;
192    struct tipc_cmd_result_msg rmsg;
193    struct iovec msg_sect[2];
194    int *arg;
195
196    msg->cmd = ntohl(msg->cmd);
197
198    cfg_prepare_res_msg(msg->cmd, msg->usr_handle, rv, &rmsg, msg_sect,
199                data, 0);
200    if (ntohl(msg->magic) != TIPC_MAGIC)
201        goto exit;
202
203    switch (msg->cmd) {
204    case TIPC_CREATE_LINK:
205        if (!cfg_check_connection(orig))
206            rv = disc_create_link(&msg->argv.create_link);
207        break;
208    case TIPC_LINK_SUBSCRIBE:
209        {
210            struct subscr_data *sub;
211
212            if (mng.link_subscriptions > 64)
213                break;
214            sub = kmalloc(sizeof(*sub),
215                                GFP_ATOMIC);
216            if (sub == NULL) {
217                warn("Memory squeeze; dropped remote link subscription\n");
218                break;
219            }
220            INIT_LIST_HEAD(&sub->subd_list);
221            tipc_createport(mng.user_ref,
222                    (void *)sub,
223                    TIPC_HIGH_IMPORTANCE,
224                    0,
225                    0,
226                    (tipc_conn_shutdown_event)cfg_linksubscr_cancel,
227                    0,
228                    0,
229                    (tipc_conn_msg_event)cfg_linksubscr_cancel,
230                    0,
231                    &sub->port_ref);
232            if (!sub->port_ref) {
233                kfree(sub);
234                break;
235            }
236            memcpy(sub->usr_handle,msg->usr_handle,
237                   sizeof(sub->usr_handle));
238            sub->domain = msg->argv.domain;
239            list_add_tail(&sub->subd_list, &mng.link_subscribers);
240            tipc_connect2port(sub->port_ref, orig);
241            rmsg.retval = TIPC_OK;
242            tipc_send(sub->port_ref, 2u, msg_sect);
243            mng.link_subscriptions++;
244            return;
245        }
246    default:
247        rv = tipc_cfg_cmd(msg, data, sz, (u32 *)&msg_sect[1].iov_len, orig);
248    }
249exit:
250    rmsg.result_len = htonl(msg_sect[1].iov_len);
251    rmsg.retval = htonl(rv);
252    tipc_cfg_respond(msg_sect, 2u, orig);
253}
254#endif
255
256#define MAX_STATS_INFO 2000
257
258static struct sk_buff *tipc_show_stats(void)
259{
260    struct sk_buff *buf;
261    struct tlv_desc *rep_tlv;
262    struct print_buf pb;
263    int str_len;
264    u32 value;
265
266    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
267        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
268
269    value = ntohl(*(u32 *)TLV_DATA(req_tlv_area));
270    if (value != 0)
271        return tipc_cfg_reply_error_string("unsupported argument");
272
273    buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_STATS_INFO));
274    if (buf == NULL)
275        return NULL;
276
277    rep_tlv = (struct tlv_desc *)buf->data;
278    tipc_printbuf_init(&pb, (char *)TLV_DATA(rep_tlv), MAX_STATS_INFO);
279
280    tipc_printf(&pb, "TIPC version " TIPC_MOD_VER "\n");
281
282    /* Use additional tipc_printf()'s to return more info ... */
283
284    str_len = tipc_printbuf_validate(&pb);
285    skb_put(buf, TLV_SPACE(str_len));
286    TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
287
288    return buf;
289}
290
291static struct sk_buff *cfg_enable_bearer(void)
292{
293    struct tipc_bearer_config *args;
294
295    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_CONFIG))
296        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
297
298    args = (struct tipc_bearer_config *)TLV_DATA(req_tlv_area);
299    if (tipc_enable_bearer(args->name,
300                   ntohl(args->detect_scope),
301                   ntohl(args->priority)))
302        return tipc_cfg_reply_error_string("unable to enable bearer");
303
304    return tipc_cfg_reply_none();
305}
306
307static struct sk_buff *cfg_disable_bearer(void)
308{
309    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_NAME))
310        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
311
312    if (tipc_disable_bearer((char *)TLV_DATA(req_tlv_area)))
313        return tipc_cfg_reply_error_string("unable to disable bearer");
314
315    return tipc_cfg_reply_none();
316}
317
318static struct sk_buff *cfg_set_own_addr(void)
319{
320    u32 addr;
321
322    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
323        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
324
325    addr = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
326    if (addr == tipc_own_addr)
327        return tipc_cfg_reply_none();
328    if (!tipc_addr_node_valid(addr))
329        return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
330                           " (node address)");
331    if (tipc_mode == TIPC_NET_MODE)
332        return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
333                           " (cannot change node address once assigned)");
334
335    /*
336     * Must release all spinlocks before calling start_net() because
337     * Linux version of TIPC calls eth_media_start() which calls
338     * register_netdevice_notifier() which may block!
339     *
340     * Temporarily releasing the lock should be harmless for non-Linux TIPC,
341     * but Linux version of eth_media_start() should really be reworked
342     * so that it can be called with spinlocks held.
343     */
344
345    spin_unlock_bh(&config_lock);
346    tipc_core_start_net(addr);
347    spin_lock_bh(&config_lock);
348    return tipc_cfg_reply_none();
349}
350
351static struct sk_buff *cfg_set_remote_mng(void)
352{
353    u32 value;
354
355    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
356        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
357
358    value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
359    tipc_remote_management = (value != 0);
360    return tipc_cfg_reply_none();
361}
362
363static struct sk_buff *cfg_set_max_publications(void)
364{
365    u32 value;
366
367    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
368        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
369
370    value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
371    if (value != delimit(value, 1, 65535))
372        return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
373                           " (max publications must be 1-65535)");
374    tipc_max_publications = value;
375    return tipc_cfg_reply_none();
376}
377
378static struct sk_buff *cfg_set_max_subscriptions(void)
379{
380    u32 value;
381
382    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
383        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
384
385    value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
386    if (value != delimit(value, 1, 65535))
387        return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
388                           " (max subscriptions must be 1-65535");
389    tipc_max_subscriptions = value;
390    return tipc_cfg_reply_none();
391}
392
393static struct sk_buff *cfg_set_max_ports(void)
394{
395    u32 value;
396
397    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
398        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
399    value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
400    if (value == tipc_max_ports)
401        return tipc_cfg_reply_none();
402    if (value != delimit(value, 127, 65535))
403        return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
404                           " (max ports must be 127-65535)");
405    if (tipc_mode != TIPC_NOT_RUNNING)
406        return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
407            " (cannot change max ports while TIPC is active)");
408    tipc_max_ports = value;
409    return tipc_cfg_reply_none();
410}
411
412static struct sk_buff *cfg_set_max_zones(void)
413{
414    u32 value;
415
416    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
417        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
418    value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
419    if (value == tipc_max_zones)
420        return tipc_cfg_reply_none();
421    if (value != delimit(value, 1, 255))
422        return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
423                           " (max zones must be 1-255)");
424    if (tipc_mode == TIPC_NET_MODE)
425        return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
426            " (cannot change max zones once TIPC has joined a network)");
427    tipc_max_zones = value;
428    return tipc_cfg_reply_none();
429}
430
431static struct sk_buff *cfg_set_max_clusters(void)
432{
433    u32 value;
434
435    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
436        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
437    value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
438    if (value != delimit(value, 1, 1))
439        return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
440                           " (max clusters fixed at 1)");
441    return tipc_cfg_reply_none();
442}
443
444static struct sk_buff *cfg_set_max_nodes(void)
445{
446    u32 value;
447
448    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
449        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
450    value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
451    if (value == tipc_max_nodes)
452        return tipc_cfg_reply_none();
453    if (value != delimit(value, 8, 2047))
454        return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
455                           " (max nodes must be 8-2047)");
456    if (tipc_mode == TIPC_NET_MODE)
457        return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
458            " (cannot change max nodes once TIPC has joined a network)");
459    tipc_max_nodes = value;
460    return tipc_cfg_reply_none();
461}
462
463static struct sk_buff *cfg_set_max_slaves(void)
464{
465    u32 value;
466
467    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
468        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
469    value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
470    if (value != 0)
471        return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
472                           " (max secondary nodes fixed at 0)");
473    return tipc_cfg_reply_none();
474}
475
476static struct sk_buff *cfg_set_netid(void)
477{
478    u32 value;
479
480    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
481        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
482    value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
483    if (value == tipc_net_id)
484        return tipc_cfg_reply_none();
485    if (value != delimit(value, 1, 9999))
486        return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
487                           " (network id must be 1-9999)");
488    if (tipc_mode == TIPC_NET_MODE)
489        return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
490            " (cannot change network id once TIPC has joined a network)");
491    tipc_net_id = value;
492    return tipc_cfg_reply_none();
493}
494
495struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
496                int request_space, int reply_headroom)
497{
498    struct sk_buff *rep_tlv_buf;
499
500    spin_lock_bh(&config_lock);
501
502    /* Save request and reply details in a well-known location */
503
504    req_tlv_area = request_area;
505    req_tlv_space = request_space;
506    rep_headroom = reply_headroom;
507
508    /* Check command authorization */
509
510    if (likely(orig_node == tipc_own_addr)) {
511        /* command is permitted */
512    } else if (cmd >= 0x8000) {
513        rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
514                              " (cannot be done remotely)");
515        goto exit;
516    } else if (!tipc_remote_management) {
517        rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
518        goto exit;
519    }
520    else if (cmd >= 0x4000) {
521        u32 domain = 0;
522
523        if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
524            (domain != orig_node)) {
525            rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
526            goto exit;
527        }
528    }
529
530    /* Call appropriate processing routine */
531
532    switch (cmd) {
533    case TIPC_CMD_NOOP:
534        rep_tlv_buf = tipc_cfg_reply_none();
535        break;
536    case TIPC_CMD_GET_NODES:
537        rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
538        break;
539    case TIPC_CMD_GET_LINKS:
540        rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
541        break;
542    case TIPC_CMD_SHOW_LINK_STATS:
543        rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
544        break;
545    case TIPC_CMD_RESET_LINK_STATS:
546        rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
547        break;
548    case TIPC_CMD_SHOW_NAME_TABLE:
549        rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
550        break;
551    case TIPC_CMD_GET_BEARER_NAMES:
552        rep_tlv_buf = tipc_bearer_get_names();
553        break;
554    case TIPC_CMD_GET_MEDIA_NAMES:
555        rep_tlv_buf = tipc_media_get_names();
556        break;
557    case TIPC_CMD_SHOW_PORTS:
558        rep_tlv_buf = tipc_port_get_ports();
559        break;
560#if 0
561    case TIPC_CMD_SHOW_PORT_STATS:
562        rep_tlv_buf = port_show_stats(req_tlv_area, req_tlv_space);
563        break;
564    case TIPC_CMD_RESET_PORT_STATS:
565        rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED);
566        break;
567#endif
568    case TIPC_CMD_SET_LOG_SIZE:
569        rep_tlv_buf = tipc_log_resize_cmd(req_tlv_area, req_tlv_space);
570        break;
571    case TIPC_CMD_DUMP_LOG:
572        rep_tlv_buf = tipc_log_dump();
573        break;
574    case TIPC_CMD_SHOW_STATS:
575        rep_tlv_buf = tipc_show_stats();
576        break;
577    case TIPC_CMD_SET_LINK_TOL:
578    case TIPC_CMD_SET_LINK_PRI:
579    case TIPC_CMD_SET_LINK_WINDOW:
580        rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
581        break;
582    case TIPC_CMD_ENABLE_BEARER:
583        rep_tlv_buf = cfg_enable_bearer();
584        break;
585    case TIPC_CMD_DISABLE_BEARER:
586        rep_tlv_buf = cfg_disable_bearer();
587        break;
588    case TIPC_CMD_SET_NODE_ADDR:
589        rep_tlv_buf = cfg_set_own_addr();
590        break;
591    case TIPC_CMD_SET_REMOTE_MNG:
592        rep_tlv_buf = cfg_set_remote_mng();
593        break;
594    case TIPC_CMD_SET_MAX_PORTS:
595        rep_tlv_buf = cfg_set_max_ports();
596        break;
597    case TIPC_CMD_SET_MAX_PUBL:
598        rep_tlv_buf = cfg_set_max_publications();
599        break;
600    case TIPC_CMD_SET_MAX_SUBSCR:
601        rep_tlv_buf = cfg_set_max_subscriptions();
602        break;
603    case TIPC_CMD_SET_MAX_ZONES:
604        rep_tlv_buf = cfg_set_max_zones();
605        break;
606    case TIPC_CMD_SET_MAX_CLUSTERS:
607        rep_tlv_buf = cfg_set_max_clusters();
608        break;
609    case TIPC_CMD_SET_MAX_NODES:
610        rep_tlv_buf = cfg_set_max_nodes();
611        break;
612    case TIPC_CMD_SET_MAX_SLAVES:
613        rep_tlv_buf = cfg_set_max_slaves();
614        break;
615    case TIPC_CMD_SET_NETID:
616        rep_tlv_buf = cfg_set_netid();
617        break;
618    case TIPC_CMD_GET_REMOTE_MNG:
619        rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_remote_management);
620        break;
621    case TIPC_CMD_GET_MAX_PORTS:
622        rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
623        break;
624    case TIPC_CMD_GET_MAX_PUBL:
625        rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_publications);
626        break;
627    case TIPC_CMD_GET_MAX_SUBSCR:
628        rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_subscriptions);
629        break;
630    case TIPC_CMD_GET_MAX_ZONES:
631        rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_zones);
632        break;
633    case TIPC_CMD_GET_MAX_CLUSTERS:
634        rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_clusters);
635        break;
636    case TIPC_CMD_GET_MAX_NODES:
637        rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_nodes);
638        break;
639    case TIPC_CMD_GET_MAX_SLAVES:
640        rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_slaves);
641        break;
642    case TIPC_CMD_GET_NETID:
643        rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
644        break;
645    case TIPC_CMD_NOT_NET_ADMIN:
646        rep_tlv_buf =
647            tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
648        break;
649    default:
650        rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
651                              " (unknown command)");
652        break;
653    }
654
655    /* Return reply buffer */
656exit:
657    spin_unlock_bh(&config_lock);
658    return rep_tlv_buf;
659}
660
661static void cfg_named_msg_event(void *userdata,
662                u32 port_ref,
663                struct sk_buff **buf,
664                const unchar *msg,
665                u32 size,
666                u32 importance,
667                struct tipc_portid const *orig,
668                struct tipc_name_seq const *dest)
669{
670    struct tipc_cfg_msg_hdr *req_hdr;
671    struct tipc_cfg_msg_hdr *rep_hdr;
672    struct sk_buff *rep_buf;
673
674    /* Validate configuration message header (ignore invalid message) */
675
676    req_hdr = (struct tipc_cfg_msg_hdr *)msg;
677    if ((size < sizeof(*req_hdr)) ||
678        (size != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
679        (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
680        warn("Invalid configuration message discarded\n");
681        return;
682    }
683
684    /* Generate reply for request (if can't, return request) */
685
686    rep_buf = tipc_cfg_do_cmd(orig->node,
687                  ntohs(req_hdr->tcm_type),
688                  msg + sizeof(*req_hdr),
689                  size - sizeof(*req_hdr),
690                  BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
691    if (rep_buf) {
692        skb_push(rep_buf, sizeof(*rep_hdr));
693        rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
694        memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
695        rep_hdr->tcm_len = htonl(rep_buf->len);
696        rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
697    } else {
698        rep_buf = *buf;
699        *buf = NULL;
700    }
701
702    /* NEED TO ADD CODE TO HANDLE FAILED SEND (SUCH AS CONGESTION) */
703    tipc_send_buf2port(port_ref, orig, rep_buf, rep_buf->len);
704}
705
706int tipc_cfg_init(void)
707{
708    struct tipc_name_seq seq;
709    int res;
710
711    res = tipc_attach(&mng.user_ref, NULL, NULL);
712    if (res)
713        goto failed;
714
715    res = tipc_createport(mng.user_ref, NULL, TIPC_CRITICAL_IMPORTANCE,
716                  NULL, NULL, NULL,
717                  NULL, cfg_named_msg_event, NULL,
718                  NULL, &mng.port_ref);
719    if (res)
720        goto failed;
721
722    seq.type = TIPC_CFG_SRV;
723    seq.lower = seq.upper = tipc_own_addr;
724    res = tipc_nametbl_publish_rsv(mng.port_ref, TIPC_ZONE_SCOPE, &seq);
725    if (res)
726        goto failed;
727
728    return 0;
729
730failed:
731    err("Unable to create configuration service\n");
732    tipc_detach(mng.user_ref);
733    mng.user_ref = 0;
734    return res;
735}
736
737void tipc_cfg_stop(void)
738{
739    if (mng.user_ref) {
740        tipc_detach(mng.user_ref);
741        mng.user_ref = 0;
742    }
743}
744

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