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    u32 subscr_ref;
60    u32 link_subscriptions;
61    struct list_head link_subscribers;
62};
63
64static struct manager mng = { 0};
65
66static DEFINE_SPINLOCK(config_lock);
67
68static const void *req_tlv_area; /* request message TLV area */
69static int req_tlv_space; /* request message TLV area size */
70static int rep_headroom; /* reply message headroom to use */
71
72
73void tipc_cfg_link_event(u32 addr, char *name, int up)
74{
75    /* TIPC DOESN'T HANDLE LINK EVENT SUBSCRIPTIONS AT THE MOMENT */
76}
77
78
79struct sk_buff *tipc_cfg_reply_alloc(int payload_size)
80{
81    struct sk_buff *buf;
82
83    buf = alloc_skb(rep_headroom + payload_size, GFP_ATOMIC);
84    if (buf)
85        skb_reserve(buf, rep_headroom);
86    return buf;
87}
88
89int tipc_cfg_append_tlv(struct sk_buff *buf, int tlv_type,
90            void *tlv_data, int tlv_data_size)
91{
92    struct tlv_desc *tlv = (struct tlv_desc *)skb_tail_pointer(buf);
93    int new_tlv_space = TLV_SPACE(tlv_data_size);
94
95    if (skb_tailroom(buf) < new_tlv_space) {
96        dbg("tipc_cfg_append_tlv unable to append TLV\n");
97        return 0;
98    }
99    skb_put(buf, new_tlv_space);
100    tlv->tlv_type = htons(tlv_type);
101    tlv->tlv_len = htons(TLV_LENGTH(tlv_data_size));
102    if (tlv_data_size && tlv_data)
103        memcpy(TLV_DATA(tlv), tlv_data, tlv_data_size);
104    return 1;
105}
106
107struct sk_buff *tipc_cfg_reply_unsigned_type(u16 tlv_type, u32 value)
108{
109    struct sk_buff *buf;
110    __be32 value_net;
111
112    buf = tipc_cfg_reply_alloc(TLV_SPACE(sizeof(value)));
113    if (buf) {
114        value_net = htonl(value);
115        tipc_cfg_append_tlv(buf, tlv_type, &value_net,
116                    sizeof(value_net));
117    }
118    return buf;
119}
120
121struct sk_buff *tipc_cfg_reply_string_type(u16 tlv_type, char *string)
122{
123    struct sk_buff *buf;
124    int string_len = strlen(string) + 1;
125
126    buf = tipc_cfg_reply_alloc(TLV_SPACE(string_len));
127    if (buf)
128        tipc_cfg_append_tlv(buf, tlv_type, string, string_len);
129    return buf;
130}
131
132
133
134
135#if 0
136
137/* Now obsolete code for handling commands not yet implemented the new way */
138
139int tipc_cfg_cmd(const struct tipc_cmd_msg * msg,
140         char *data,
141         u32 sz,
142         u32 *ret_size,
143         struct tipc_portid *orig)
144{
145    int rv = -EINVAL;
146    u32 cmd = msg->cmd;
147
148    *ret_size = 0;
149    switch (cmd) {
150    case TIPC_REMOVE_LINK:
151    case TIPC_CMD_BLOCK_LINK:
152    case TIPC_CMD_UNBLOCK_LINK:
153        if (!cfg_check_connection(orig))
154            rv = link_control(msg->argv.link_name, msg->cmd, 0);
155        break;
156    case TIPC_ESTABLISH:
157        {
158            int connected;
159
160            tipc_isconnected(mng.conn_port_ref, &connected);
161            if (connected || !orig) {
162                rv = TIPC_FAILURE;
163                break;
164            }
165            rv = tipc_connect2port(mng.conn_port_ref, orig);
166            if (rv == TIPC_OK)
167                orig = 0;
168            break;
169        }
170    case TIPC_GET_PEER_ADDRESS:
171        *ret_size = link_peer_addr(msg->argv.link_name, data, sz);
172        break;
173    case TIPC_GET_ROUTES:
174        rv = TIPC_OK;
175        break;
176    default: {}
177    }
178    if (*ret_size)
179        rv = TIPC_OK;
180    return rv;
181}
182
183static void cfg_cmd_event(struct tipc_cmd_msg *msg,
184              char *data,
185              u32 sz,
186              struct tipc_portid const *orig)
187{
188    int rv = -EINVAL;
189    struct tipc_cmd_result_msg rmsg;
190    struct iovec msg_sect[2];
191    int *arg;
192
193    msg->cmd = ntohl(msg->cmd);
194
195    cfg_prepare_res_msg(msg->cmd, msg->usr_handle, rv, &rmsg, msg_sect,
196                data, 0);
197    if (ntohl(msg->magic) != TIPC_MAGIC)
198        goto exit;
199
200    switch (msg->cmd) {
201    case TIPC_CREATE_LINK:
202        if (!cfg_check_connection(orig))
203            rv = disc_create_link(&msg->argv.create_link);
204        break;
205    case TIPC_LINK_SUBSCRIBE:
206        {
207            struct subscr_data *sub;
208
209            if (mng.link_subscriptions > 64)
210                break;
211            sub = kmalloc(sizeof(*sub),
212                                GFP_ATOMIC);
213            if (sub == NULL) {
214                warn("Memory squeeze; dropped remote link subscription\n");
215                break;
216            }
217            INIT_LIST_HEAD(&sub->subd_list);
218            tipc_createport(mng.user_ref,
219                    (void *)sub,
220                    TIPC_HIGH_IMPORTANCE,
221                    0,
222                    0,
223                    (tipc_conn_shutdown_event)cfg_linksubscr_cancel,
224                    0,
225                    0,
226                    (tipc_conn_msg_event)cfg_linksubscr_cancel,
227                    0,
228                    &sub->port_ref);
229            if (!sub->port_ref) {
230                kfree(sub);
231                break;
232            }
233            memcpy(sub->usr_handle,msg->usr_handle,
234                   sizeof(sub->usr_handle));
235            sub->domain = msg->argv.domain;
236            list_add_tail(&sub->subd_list, &mng.link_subscribers);
237            tipc_connect2port(sub->port_ref, orig);
238            rmsg.retval = TIPC_OK;
239            tipc_send(sub->port_ref, 2u, msg_sect);
240            mng.link_subscriptions++;
241            return;
242        }
243    default:
244        rv = tipc_cfg_cmd(msg, data, sz, (u32 *)&msg_sect[1].iov_len, orig);
245    }
246    exit:
247    rmsg.result_len = htonl(msg_sect[1].iov_len);
248    rmsg.retval = htonl(rv);
249    tipc_cfg_respond(msg_sect, 2u, orig);
250}
251#endif
252
253static struct sk_buff *cfg_enable_bearer(void)
254{
255    struct tipc_bearer_config *args;
256
257    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_CONFIG))
258        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
259
260    args = (struct tipc_bearer_config *)TLV_DATA(req_tlv_area);
261    if (tipc_enable_bearer(args->name,
262                   ntohl(args->detect_scope),
263                   ntohl(args->priority)))
264        return tipc_cfg_reply_error_string("unable to enable bearer");
265
266    return tipc_cfg_reply_none();
267}
268
269static struct sk_buff *cfg_disable_bearer(void)
270{
271    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_NAME))
272        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
273
274    if (tipc_disable_bearer((char *)TLV_DATA(req_tlv_area)))
275        return tipc_cfg_reply_error_string("unable to disable bearer");
276
277    return tipc_cfg_reply_none();
278}
279
280static struct sk_buff *cfg_set_own_addr(void)
281{
282    u32 addr;
283
284    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
285        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
286
287    addr = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
288    if (addr == tipc_own_addr)
289        return tipc_cfg_reply_none();
290    if (!tipc_addr_node_valid(addr))
291        return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
292                           " (node address)");
293    if (tipc_mode == TIPC_NET_MODE)
294        return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
295                           " (cannot change node address once assigned)");
296
297    /*
298     * Must release all spinlocks before calling start_net() because
299     * Linux version of TIPC calls eth_media_start() which calls
300     * register_netdevice_notifier() which may block!
301     *
302     * Temporarily releasing the lock should be harmless for non-Linux TIPC,
303     * but Linux version of eth_media_start() should really be reworked
304     * so that it can be called with spinlocks held.
305     */
306
307    spin_unlock_bh(&config_lock);
308    tipc_core_start_net(addr);
309    spin_lock_bh(&config_lock);
310    return tipc_cfg_reply_none();
311}
312
313static struct sk_buff *cfg_set_remote_mng(void)
314{
315    u32 value;
316
317    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
318        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
319
320    value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
321    tipc_remote_management = (value != 0);
322    return tipc_cfg_reply_none();
323}
324
325static struct sk_buff *cfg_set_max_publications(void)
326{
327    u32 value;
328
329    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
330        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
331
332    value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
333    if (value != delimit(value, 1, 65535))
334        return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
335                           " (max publications must be 1-65535)");
336    tipc_max_publications = value;
337    return tipc_cfg_reply_none();
338}
339
340static struct sk_buff *cfg_set_max_subscriptions(void)
341{
342    u32 value;
343
344    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
345        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
346
347    value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
348    if (value != delimit(value, 1, 65535))
349        return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
350                           " (max subscriptions must be 1-65535");
351    tipc_max_subscriptions = value;
352    return tipc_cfg_reply_none();
353}
354
355static struct sk_buff *cfg_set_max_ports(void)
356{
357    u32 value;
358
359    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
360        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
361    value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
362    if (value == tipc_max_ports)
363        return tipc_cfg_reply_none();
364    if (value != delimit(value, 127, 65535))
365        return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
366                           " (max ports must be 127-65535)");
367    if (tipc_mode != TIPC_NOT_RUNNING)
368        return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
369            " (cannot change max ports while TIPC is active)");
370    tipc_max_ports = value;
371    return tipc_cfg_reply_none();
372}
373
374static struct sk_buff *cfg_set_max_zones(void)
375{
376    u32 value;
377
378    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
379        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
380    value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
381    if (value == tipc_max_zones)
382        return tipc_cfg_reply_none();
383    if (value != delimit(value, 1, 255))
384        return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
385                           " (max zones must be 1-255)");
386    if (tipc_mode == TIPC_NET_MODE)
387        return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
388            " (cannot change max zones once TIPC has joined a network)");
389    tipc_max_zones = value;
390    return tipc_cfg_reply_none();
391}
392
393static struct sk_buff *cfg_set_max_clusters(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 != delimit(value, 1, 1))
401        return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
402                           " (max clusters fixed at 1)");
403    return tipc_cfg_reply_none();
404}
405
406static struct sk_buff *cfg_set_max_nodes(void)
407{
408    u32 value;
409
410    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
411        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
412    value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
413    if (value == tipc_max_nodes)
414        return tipc_cfg_reply_none();
415    if (value != delimit(value, 8, 2047))
416        return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
417                           " (max nodes must be 8-2047)");
418    if (tipc_mode == TIPC_NET_MODE)
419        return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
420            " (cannot change max nodes once TIPC has joined a network)");
421    tipc_max_nodes = value;
422    return tipc_cfg_reply_none();
423}
424
425static struct sk_buff *cfg_set_max_slaves(void)
426{
427    u32 value;
428
429    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
430        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
431    value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
432    if (value != 0)
433        return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
434                           " (max secondary nodes fixed at 0)");
435    return tipc_cfg_reply_none();
436}
437
438static struct sk_buff *cfg_set_netid(void)
439{
440    u32 value;
441
442    if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
443        return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
444    value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
445    if (value == tipc_net_id)
446        return tipc_cfg_reply_none();
447    if (value != delimit(value, 1, 9999))
448        return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
449                           " (network id must be 1-9999)");
450    if (tipc_mode == TIPC_NET_MODE)
451        return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
452            " (cannot change network id once TIPC has joined a network)");
453    tipc_net_id = value;
454    return tipc_cfg_reply_none();
455}
456
457struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
458                int request_space, int reply_headroom)
459{
460    struct sk_buff *rep_tlv_buf;
461
462    spin_lock_bh(&config_lock);
463
464    /* Save request and reply details in a well-known location */
465
466    req_tlv_area = request_area;
467    req_tlv_space = request_space;
468    rep_headroom = reply_headroom;
469
470    /* Check command authorization */
471
472    if (likely(orig_node == tipc_own_addr)) {
473        /* command is permitted */
474    } else if (cmd >= 0x8000) {
475        rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
476                              " (cannot be done remotely)");
477        goto exit;
478    } else if (!tipc_remote_management) {
479        rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
480        goto exit;
481    }
482    else if (cmd >= 0x4000) {
483        u32 domain = 0;
484
485        if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
486            (domain != orig_node)) {
487            rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
488            goto exit;
489        }
490    }
491
492    /* Call appropriate processing routine */
493
494    switch (cmd) {
495    case TIPC_CMD_NOOP:
496        rep_tlv_buf = tipc_cfg_reply_none();
497        break;
498    case TIPC_CMD_GET_NODES:
499        rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
500        break;
501    case TIPC_CMD_GET_LINKS:
502        rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
503        break;
504    case TIPC_CMD_SHOW_LINK_STATS:
505        rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
506        break;
507    case TIPC_CMD_RESET_LINK_STATS:
508        rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
509        break;
510    case TIPC_CMD_SHOW_NAME_TABLE:
511        rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
512        break;
513    case TIPC_CMD_GET_BEARER_NAMES:
514        rep_tlv_buf = tipc_bearer_get_names();
515        break;
516    case TIPC_CMD_GET_MEDIA_NAMES:
517        rep_tlv_buf = tipc_media_get_names();
518        break;
519    case TIPC_CMD_SHOW_PORTS:
520        rep_tlv_buf = tipc_port_get_ports();
521        break;
522#if 0
523    case TIPC_CMD_SHOW_PORT_STATS:
524        rep_tlv_buf = port_show_stats(req_tlv_area, req_tlv_space);
525        break;
526    case TIPC_CMD_RESET_PORT_STATS:
527        rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED);
528        break;
529#endif
530    case TIPC_CMD_SET_LOG_SIZE:
531        rep_tlv_buf = tipc_log_resize_cmd(req_tlv_area, req_tlv_space);
532        break;
533    case TIPC_CMD_DUMP_LOG:
534        rep_tlv_buf = tipc_log_dump();
535        break;
536    case TIPC_CMD_SET_LINK_TOL:
537    case TIPC_CMD_SET_LINK_PRI:
538    case TIPC_CMD_SET_LINK_WINDOW:
539        rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
540        break;
541    case TIPC_CMD_ENABLE_BEARER:
542        rep_tlv_buf = cfg_enable_bearer();
543        break;
544    case TIPC_CMD_DISABLE_BEARER:
545        rep_tlv_buf = cfg_disable_bearer();
546        break;
547    case TIPC_CMD_SET_NODE_ADDR:
548        rep_tlv_buf = cfg_set_own_addr();
549        break;
550    case TIPC_CMD_SET_REMOTE_MNG:
551        rep_tlv_buf = cfg_set_remote_mng();
552        break;
553    case TIPC_CMD_SET_MAX_PORTS:
554        rep_tlv_buf = cfg_set_max_ports();
555        break;
556    case TIPC_CMD_SET_MAX_PUBL:
557        rep_tlv_buf = cfg_set_max_publications();
558        break;
559    case TIPC_CMD_SET_MAX_SUBSCR:
560        rep_tlv_buf = cfg_set_max_subscriptions();
561        break;
562    case TIPC_CMD_SET_MAX_ZONES:
563        rep_tlv_buf = cfg_set_max_zones();
564        break;
565    case TIPC_CMD_SET_MAX_CLUSTERS:
566        rep_tlv_buf = cfg_set_max_clusters();
567        break;
568    case TIPC_CMD_SET_MAX_NODES:
569        rep_tlv_buf = cfg_set_max_nodes();
570        break;
571    case TIPC_CMD_SET_MAX_SLAVES:
572        rep_tlv_buf = cfg_set_max_slaves();
573        break;
574    case TIPC_CMD_SET_NETID:
575        rep_tlv_buf = cfg_set_netid();
576        break;
577    case TIPC_CMD_GET_REMOTE_MNG:
578        rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_remote_management);
579        break;
580    case TIPC_CMD_GET_MAX_PORTS:
581        rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
582        break;
583    case TIPC_CMD_GET_MAX_PUBL:
584        rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_publications);
585        break;
586    case TIPC_CMD_GET_MAX_SUBSCR:
587        rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_subscriptions);
588        break;
589    case TIPC_CMD_GET_MAX_ZONES:
590        rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_zones);
591        break;
592    case TIPC_CMD_GET_MAX_CLUSTERS:
593        rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_clusters);
594        break;
595    case TIPC_CMD_GET_MAX_NODES:
596        rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_nodes);
597        break;
598    case TIPC_CMD_GET_MAX_SLAVES:
599        rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_slaves);
600        break;
601    case TIPC_CMD_GET_NETID:
602        rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
603        break;
604    case TIPC_CMD_NOT_NET_ADMIN:
605        rep_tlv_buf =
606            tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
607        break;
608    default:
609        rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
610                              " (unknown command)");
611        break;
612    }
613
614    /* Return reply buffer */
615exit:
616    spin_unlock_bh(&config_lock);
617    return rep_tlv_buf;
618}
619
620static void cfg_named_msg_event(void *userdata,
621                u32 port_ref,
622                struct sk_buff **buf,
623                const unchar *msg,
624                u32 size,
625                u32 importance,
626                struct tipc_portid const *orig,
627                struct tipc_name_seq const *dest)
628{
629    struct tipc_cfg_msg_hdr *req_hdr;
630    struct tipc_cfg_msg_hdr *rep_hdr;
631    struct sk_buff *rep_buf;
632
633    /* Validate configuration message header (ignore invalid message) */
634
635    req_hdr = (struct tipc_cfg_msg_hdr *)msg;
636    if ((size < sizeof(*req_hdr)) ||
637        (size != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
638        (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
639        warn("Invalid configuration message discarded\n");
640        return;
641    }
642
643    /* Generate reply for request (if can't, return request) */
644
645    rep_buf = tipc_cfg_do_cmd(orig->node,
646                  ntohs(req_hdr->tcm_type),
647                  msg + sizeof(*req_hdr),
648                  size - sizeof(*req_hdr),
649                  BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
650    if (rep_buf) {
651        skb_push(rep_buf, sizeof(*rep_hdr));
652        rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
653        memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
654        rep_hdr->tcm_len = htonl(rep_buf->len);
655        rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
656    } else {
657        rep_buf = *buf;
658        *buf = NULL;
659    }
660
661    /* NEED TO ADD CODE TO HANDLE FAILED SEND (SUCH AS CONGESTION) */
662    tipc_send_buf2port(port_ref, orig, rep_buf, rep_buf->len);
663}
664
665int tipc_cfg_init(void)
666{
667    struct tipc_name_seq seq;
668    int res;
669
670    memset(&mng, 0, sizeof(mng));
671    INIT_LIST_HEAD(&mng.link_subscribers);
672
673    res = tipc_attach(&mng.user_ref, NULL, NULL);
674    if (res)
675        goto failed;
676
677    res = tipc_createport(mng.user_ref, NULL, TIPC_CRITICAL_IMPORTANCE,
678                  NULL, NULL, NULL,
679                  NULL, cfg_named_msg_event, NULL,
680                  NULL, &mng.port_ref);
681    if (res)
682        goto failed;
683
684    seq.type = TIPC_CFG_SRV;
685    seq.lower = seq.upper = tipc_own_addr;
686    res = tipc_nametbl_publish_rsv(mng.port_ref, TIPC_ZONE_SCOPE, &seq);
687    if (res)
688        goto failed;
689
690    return 0;
691
692failed:
693    err("Unable to create configuration service\n");
694    tipc_detach(mng.user_ref);
695    mng.user_ref = 0;
696    return res;
697}
698
699void tipc_cfg_stop(void)
700{
701    if (mng.user_ref) {
702        tipc_detach(mng.user_ref);
703        mng.user_ref = 0;
704    }
705}
706

Archive Download this file



interactive