Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/link.c: TIPC link code | |
c4307285 | 3 | * |
170b3927 | 4 | * Copyright (c) 1996-2007, 2012-2014, Ericsson AB |
198d73b8 | 5 | * Copyright (c) 2004-2007, 2010-2013, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
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. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
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 | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
37 | #include "core.h" | |
b97bf3fd | 38 | #include "link.h" |
7be57fc6 | 39 | #include "bcast.h" |
9816f061 | 40 | #include "socket.h" |
b97bf3fd | 41 | #include "name_distr.h" |
b97bf3fd PL |
42 | #include "discover.h" |
43 | #include "config.h" | |
0655f6a8 | 44 | #include "netlink.h" |
b97bf3fd | 45 | |
796c75d0 YX |
46 | #include <linux/pkt_sched.h> |
47 | ||
2cf8aa19 EH |
48 | /* |
49 | * Error message prefixes | |
50 | */ | |
51 | static const char *link_co_err = "Link changeover error, "; | |
52 | static const char *link_rst_msg = "Resetting link "; | |
53 | static const char *link_unk_evt = "Unknown link event "; | |
b97bf3fd | 54 | |
7be57fc6 RA |
55 | static const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = { |
56 | [TIPC_NLA_LINK_UNSPEC] = { .type = NLA_UNSPEC }, | |
57 | [TIPC_NLA_LINK_NAME] = { | |
58 | .type = NLA_STRING, | |
59 | .len = TIPC_MAX_LINK_NAME | |
60 | }, | |
61 | [TIPC_NLA_LINK_MTU] = { .type = NLA_U32 }, | |
62 | [TIPC_NLA_LINK_BROADCAST] = { .type = NLA_FLAG }, | |
63 | [TIPC_NLA_LINK_UP] = { .type = NLA_FLAG }, | |
64 | [TIPC_NLA_LINK_ACTIVE] = { .type = NLA_FLAG }, | |
65 | [TIPC_NLA_LINK_PROP] = { .type = NLA_NESTED }, | |
66 | [TIPC_NLA_LINK_STATS] = { .type = NLA_NESTED }, | |
67 | [TIPC_NLA_LINK_RX] = { .type = NLA_U32 }, | |
68 | [TIPC_NLA_LINK_TX] = { .type = NLA_U32 } | |
69 | }; | |
70 | ||
0655f6a8 RA |
71 | /* Properties valid for media, bearar and link */ |
72 | static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = { | |
73 | [TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC }, | |
74 | [TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 }, | |
75 | [TIPC_NLA_PROP_TOL] = { .type = NLA_U32 }, | |
76 | [TIPC_NLA_PROP_WIN] = { .type = NLA_U32 } | |
77 | }; | |
78 | ||
a686e685 AS |
79 | /* |
80 | * Out-of-range value for link session numbers | |
81 | */ | |
a686e685 AS |
82 | #define INVALID_SESSION 0x10000 |
83 | ||
c4307285 YH |
84 | /* |
85 | * Link state events: | |
b97bf3fd | 86 | */ |
b97bf3fd PL |
87 | #define STARTING_EVT 856384768 /* link processing trigger */ |
88 | #define TRAFFIC_MSG_EVT 560815u /* rx'd ??? */ | |
89 | #define TIMEOUT_EVT 560817u /* link timer expired */ | |
90 | ||
c4307285 YH |
91 | /* |
92 | * The following two 'message types' is really just implementation | |
93 | * data conveniently stored in the message header. | |
b97bf3fd PL |
94 | * They must not be considered part of the protocol |
95 | */ | |
96 | #define OPEN_MSG 0 | |
97 | #define CLOSED_MSG 1 | |
98 | ||
c4307285 | 99 | /* |
b97bf3fd PL |
100 | * State value stored in 'exp_msg_count' |
101 | */ | |
b97bf3fd PL |
102 | #define START_CHANGEOVER 100000u |
103 | ||
c93d3baa YX |
104 | static void link_handle_out_of_seq_msg(struct net *net, |
105 | struct tipc_link *l_ptr, | |
b97bf3fd | 106 | struct sk_buff *buf); |
c93d3baa YX |
107 | static void tipc_link_proto_rcv(struct net *net, struct tipc_link *l_ptr, |
108 | struct sk_buff *buf); | |
109 | static int tipc_link_tunnel_rcv(struct net *net, struct tipc_node *n_ptr, | |
170b3927 | 110 | struct sk_buff **buf); |
2f55c437 | 111 | static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol); |
a18c4bc3 PG |
112 | static void link_state_event(struct tipc_link *l_ptr, u32 event); |
113 | static void link_reset_statistics(struct tipc_link *l_ptr); | |
114 | static void link_print(struct tipc_link *l_ptr, const char *str); | |
247f0f3c YX |
115 | static void tipc_link_sync_xmit(struct tipc_link *l); |
116 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf); | |
f2f9800d YX |
117 | static int tipc_link_input(struct net *net, struct tipc_link *l, |
118 | struct sk_buff *buf); | |
c93d3baa YX |
119 | static int tipc_link_prepare_input(struct net *net, struct tipc_link *l, |
120 | struct sk_buff **buf); | |
31e3c3f6 | 121 | |
b97bf3fd | 122 | /* |
05790c64 | 123 | * Simple link routines |
b97bf3fd | 124 | */ |
05790c64 | 125 | static unsigned int align(unsigned int i) |
b97bf3fd PL |
126 | { |
127 | return (i + 3) & ~3u; | |
128 | } | |
129 | ||
a18c4bc3 | 130 | static void link_init_max_pkt(struct tipc_link *l_ptr) |
b97bf3fd | 131 | { |
7f9f95d9 YX |
132 | struct tipc_node *node = l_ptr->owner; |
133 | struct tipc_net *tn = net_generic(node->net, tipc_net_id); | |
7a2f7d18 | 134 | struct tipc_bearer *b_ptr; |
b97bf3fd | 135 | u32 max_pkt; |
c4307285 | 136 | |
7a2f7d18 | 137 | rcu_read_lock(); |
7f9f95d9 | 138 | b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]); |
7a2f7d18 YX |
139 | if (!b_ptr) { |
140 | rcu_read_unlock(); | |
141 | return; | |
142 | } | |
143 | max_pkt = (b_ptr->mtu & ~3); | |
144 | rcu_read_unlock(); | |
145 | ||
b97bf3fd PL |
146 | if (max_pkt > MAX_MSG_SIZE) |
147 | max_pkt = MAX_MSG_SIZE; | |
148 | ||
c4307285 | 149 | l_ptr->max_pkt_target = max_pkt; |
b97bf3fd PL |
150 | if (l_ptr->max_pkt_target < MAX_PKT_DEFAULT) |
151 | l_ptr->max_pkt = l_ptr->max_pkt_target; | |
c4307285 | 152 | else |
b97bf3fd PL |
153 | l_ptr->max_pkt = MAX_PKT_DEFAULT; |
154 | ||
c4307285 | 155 | l_ptr->max_pkt_probes = 0; |
b97bf3fd PL |
156 | } |
157 | ||
b97bf3fd | 158 | /* |
05790c64 | 159 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 160 | */ |
a18c4bc3 | 161 | int tipc_link_is_up(struct tipc_link *l_ptr) |
b97bf3fd PL |
162 | { |
163 | if (!l_ptr) | |
164 | return 0; | |
a02cec21 | 165 | return link_working_working(l_ptr) || link_working_unknown(l_ptr); |
b97bf3fd PL |
166 | } |
167 | ||
a18c4bc3 | 168 | int tipc_link_is_active(struct tipc_link *l_ptr) |
b97bf3fd | 169 | { |
a02cec21 ED |
170 | return (l_ptr->owner->active_links[0] == l_ptr) || |
171 | (l_ptr->owner->active_links[1] == l_ptr); | |
b97bf3fd PL |
172 | } |
173 | ||
b97bf3fd PL |
174 | /** |
175 | * link_timeout - handle expiration of link timer | |
176 | * @l_ptr: pointer to link | |
b97bf3fd | 177 | */ |
2f55c437 | 178 | static void link_timeout(unsigned long data) |
b97bf3fd | 179 | { |
2f55c437 | 180 | struct tipc_link *l_ptr = (struct tipc_link *)data; |
58dc55f2 YX |
181 | struct sk_buff *skb; |
182 | ||
4323add6 | 183 | tipc_node_lock(l_ptr->owner); |
b97bf3fd PL |
184 | |
185 | /* update counters used in statistical profiling of send traffic */ | |
58dc55f2 | 186 | l_ptr->stats.accu_queue_sz += skb_queue_len(&l_ptr->outqueue); |
b97bf3fd PL |
187 | l_ptr->stats.queue_sz_counts++; |
188 | ||
58dc55f2 YX |
189 | skb = skb_peek(&l_ptr->outqueue); |
190 | if (skb) { | |
191 | struct tipc_msg *msg = buf_msg(skb); | |
b97bf3fd PL |
192 | u32 length = msg_size(msg); |
193 | ||
f64f9e71 JP |
194 | if ((msg_user(msg) == MSG_FRAGMENTER) && |
195 | (msg_type(msg) == FIRST_FRAGMENT)) { | |
b97bf3fd PL |
196 | length = msg_size(msg_get_wrapped(msg)); |
197 | } | |
198 | if (length) { | |
199 | l_ptr->stats.msg_lengths_total += length; | |
200 | l_ptr->stats.msg_length_counts++; | |
201 | if (length <= 64) | |
202 | l_ptr->stats.msg_length_profile[0]++; | |
203 | else if (length <= 256) | |
204 | l_ptr->stats.msg_length_profile[1]++; | |
205 | else if (length <= 1024) | |
206 | l_ptr->stats.msg_length_profile[2]++; | |
207 | else if (length <= 4096) | |
208 | l_ptr->stats.msg_length_profile[3]++; | |
209 | else if (length <= 16384) | |
210 | l_ptr->stats.msg_length_profile[4]++; | |
211 | else if (length <= 32768) | |
212 | l_ptr->stats.msg_length_profile[5]++; | |
213 | else | |
214 | l_ptr->stats.msg_length_profile[6]++; | |
215 | } | |
216 | } | |
217 | ||
218 | /* do all other link processing performed on a periodic basis */ | |
b97bf3fd PL |
219 | link_state_event(l_ptr, TIMEOUT_EVT); |
220 | ||
221 | if (l_ptr->next_out) | |
47b4c9a8 | 222 | tipc_link_push_packets(l_ptr); |
b97bf3fd | 223 | |
4323add6 | 224 | tipc_node_unlock(l_ptr->owner); |
b97bf3fd PL |
225 | } |
226 | ||
2f55c437 | 227 | static void link_set_timer(struct tipc_link *link, unsigned long time) |
b97bf3fd | 228 | { |
2f55c437 | 229 | mod_timer(&link->timer, jiffies + time); |
b97bf3fd PL |
230 | } |
231 | ||
232 | /** | |
4323add6 | 233 | * tipc_link_create - create a new link |
37b9c08a | 234 | * @n_ptr: pointer to associated node |
b97bf3fd | 235 | * @b_ptr: pointer to associated bearer |
b97bf3fd | 236 | * @media_addr: media address to use when sending messages over link |
c4307285 | 237 | * |
b97bf3fd PL |
238 | * Returns pointer to link. |
239 | */ | |
a18c4bc3 | 240 | struct tipc_link *tipc_link_create(struct tipc_node *n_ptr, |
c61dd61d YX |
241 | struct tipc_bearer *b_ptr, |
242 | const struct tipc_media_addr *media_addr) | |
b97bf3fd | 243 | { |
a18c4bc3 | 244 | struct tipc_link *l_ptr; |
b97bf3fd PL |
245 | struct tipc_msg *msg; |
246 | char *if_name; | |
37b9c08a AS |
247 | char addr_string[16]; |
248 | u32 peer = n_ptr->addr; | |
249 | ||
0372bf5c | 250 | if (n_ptr->link_cnt >= MAX_BEARERS) { |
37b9c08a | 251 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
0372bf5c HB |
252 | pr_err("Attempt to establish %uth link to %s. Max %u allowed.\n", |
253 | n_ptr->link_cnt, addr_string, MAX_BEARERS); | |
37b9c08a AS |
254 | return NULL; |
255 | } | |
256 | ||
257 | if (n_ptr->links[b_ptr->identity]) { | |
258 | tipc_addr_string_fill(addr_string, n_ptr->addr); | |
2cf8aa19 EH |
259 | pr_err("Attempt to establish second link on <%s> to %s\n", |
260 | b_ptr->name, addr_string); | |
37b9c08a AS |
261 | return NULL; |
262 | } | |
b97bf3fd | 263 | |
0da974f4 | 264 | l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC); |
b97bf3fd | 265 | if (!l_ptr) { |
2cf8aa19 | 266 | pr_warn("Link creation failed, no memory\n"); |
b97bf3fd PL |
267 | return NULL; |
268 | } | |
b97bf3fd PL |
269 | |
270 | l_ptr->addr = peer; | |
2d627b92 | 271 | if_name = strchr(b_ptr->name, ':') + 1; |
062b4c99 | 272 | sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:unknown", |
b97bf3fd | 273 | tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr), |
c4307285 | 274 | tipc_node(tipc_own_addr), |
b97bf3fd PL |
275 | if_name, |
276 | tipc_zone(peer), tipc_cluster(peer), tipc_node(peer)); | |
062b4c99 | 277 | /* note: peer i/f name is updated by reset/activate message */ |
b97bf3fd | 278 | memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr)); |
37b9c08a | 279 | l_ptr->owner = n_ptr; |
b97bf3fd | 280 | l_ptr->checkpoint = 1; |
f882cb76 | 281 | l_ptr->peer_session = INVALID_SESSION; |
7a2f7d18 | 282 | l_ptr->bearer_id = b_ptr->identity; |
5c216e1d | 283 | link_set_supervision_props(l_ptr, b_ptr->tolerance); |
b97bf3fd PL |
284 | l_ptr->state = RESET_UNKNOWN; |
285 | ||
286 | l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg; | |
287 | msg = l_ptr->pmsg; | |
c68ca7b7 | 288 | tipc_msg_init(msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, l_ptr->addr); |
b97bf3fd | 289 | msg_set_size(msg, sizeof(l_ptr->proto_msg)); |
a686e685 | 290 | msg_set_session(msg, (tipc_random & 0xffff)); |
b97bf3fd PL |
291 | msg_set_bearer_id(msg, b_ptr->identity); |
292 | strcpy((char *)msg_data(msg), if_name); | |
293 | ||
294 | l_ptr->priority = b_ptr->priority; | |
5c216e1d | 295 | tipc_link_set_queue_limits(l_ptr, b_ptr->window); |
b97bf3fd | 296 | |
7a2f7d18 | 297 | l_ptr->net_plane = b_ptr->net_plane; |
b97bf3fd PL |
298 | link_init_max_pkt(l_ptr); |
299 | ||
300 | l_ptr->next_out_no = 1; | |
58dc55f2 | 301 | __skb_queue_head_init(&l_ptr->outqueue); |
bc6fecd4 | 302 | __skb_queue_head_init(&l_ptr->deferred_queue); |
340b6e59 | 303 | skb_queue_head_init(&l_ptr->waiting_sks); |
b97bf3fd PL |
304 | |
305 | link_reset_statistics(l_ptr); | |
306 | ||
37b9c08a | 307 | tipc_node_attach_link(n_ptr, l_ptr); |
b97bf3fd | 308 | |
2f55c437 | 309 | setup_timer(&l_ptr->timer, link_timeout, (unsigned long)l_ptr); |
581465fa JPM |
310 | |
311 | link_state_event(l_ptr, STARTING_EVT); | |
b97bf3fd | 312 | |
b97bf3fd PL |
313 | return l_ptr; |
314 | } | |
315 | ||
f2f9800d YX |
316 | void tipc_link_delete_list(struct net *net, unsigned int bearer_id, |
317 | bool shutting_down) | |
8d8439b6 | 318 | { |
f2f9800d | 319 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
8d8439b6 | 320 | struct tipc_link *l_ptr; |
c61dd61d | 321 | struct tipc_node *n_ptr; |
8d8439b6 | 322 | |
6c7a762e | 323 | rcu_read_lock(); |
f2f9800d | 324 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
5356f3d7 | 325 | tipc_node_lock(n_ptr); |
c61dd61d YX |
326 | l_ptr = n_ptr->links[bearer_id]; |
327 | if (l_ptr) { | |
328 | tipc_link_reset(l_ptr); | |
7d33939f JPM |
329 | if (shutting_down || !tipc_node_is_up(n_ptr)) { |
330 | tipc_node_detach_link(l_ptr->owner, l_ptr); | |
331 | tipc_link_reset_fragments(l_ptr); | |
5356f3d7 | 332 | tipc_node_unlock(n_ptr); |
7d33939f JPM |
333 | |
334 | /* Nobody else can access this link now: */ | |
335 | del_timer_sync(&l_ptr->timer); | |
336 | kfree(l_ptr); | |
337 | } else { | |
338 | /* Detach/delete when failover is finished: */ | |
339 | l_ptr->flags |= LINK_STOPPED; | |
5356f3d7 | 340 | tipc_node_unlock(n_ptr); |
7d33939f JPM |
341 | del_timer_sync(&l_ptr->timer); |
342 | } | |
c61dd61d YX |
343 | continue; |
344 | } | |
5356f3d7 | 345 | tipc_node_unlock(n_ptr); |
8d8439b6 | 346 | } |
6c7a762e | 347 | rcu_read_unlock(); |
8d8439b6 | 348 | } |
b97bf3fd PL |
349 | |
350 | /** | |
50100a5e JPM |
351 | * link_schedule_user - schedule user for wakeup after congestion |
352 | * @link: congested link | |
353 | * @oport: sending port | |
354 | * @chain_sz: size of buffer chain that was attempted sent | |
355 | * @imp: importance of message attempted sent | |
356 | * Create pseudo msg to send back to user when congestion abates | |
b97bf3fd | 357 | */ |
50100a5e JPM |
358 | static bool link_schedule_user(struct tipc_link *link, u32 oport, |
359 | uint chain_sz, uint imp) | |
b97bf3fd | 360 | { |
50100a5e JPM |
361 | struct sk_buff *buf; |
362 | ||
363 | buf = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, tipc_own_addr, | |
364 | tipc_own_addr, oport, 0, 0); | |
365 | if (!buf) | |
366 | return false; | |
367 | TIPC_SKB_CB(buf)->chain_sz = chain_sz; | |
368 | TIPC_SKB_CB(buf)->chain_imp = imp; | |
340b6e59 | 369 | skb_queue_tail(&link->waiting_sks, buf); |
50100a5e JPM |
370 | link->stats.link_congs++; |
371 | return true; | |
b97bf3fd PL |
372 | } |
373 | ||
50100a5e JPM |
374 | /** |
375 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
376 | * @link: congested link | |
377 | * Move a number of waiting users, as permitted by available space in | |
378 | * the send queue, from link wait queue to node wait queue for wakeup | |
379 | */ | |
380 | static void link_prepare_wakeup(struct tipc_link *link) | |
b97bf3fd | 381 | { |
58dc55f2 | 382 | uint pend_qsz = skb_queue_len(&link->outqueue); |
58d78b32 | 383 | struct sk_buff *skb, *tmp; |
50100a5e | 384 | |
58d78b32 YX |
385 | skb_queue_walk_safe(&link->waiting_sks, skb, tmp) { |
386 | if (pend_qsz >= link->queue_limit[TIPC_SKB_CB(skb)->chain_imp]) | |
b97bf3fd | 387 | break; |
58d78b32 | 388 | pend_qsz += TIPC_SKB_CB(skb)->chain_sz; |
340b6e59 RA |
389 | skb_unlink(skb, &link->waiting_sks); |
390 | skb_queue_tail(&link->owner->waiting_sks, skb); | |
b97bf3fd | 391 | } |
b97bf3fd PL |
392 | } |
393 | ||
b97bf3fd | 394 | /** |
4323add6 | 395 | * tipc_link_reset_fragments - purge link's inbound message fragments queue |
b97bf3fd PL |
396 | * @l_ptr: pointer to link |
397 | */ | |
a18c4bc3 | 398 | void tipc_link_reset_fragments(struct tipc_link *l_ptr) |
b97bf3fd | 399 | { |
37e22164 JPM |
400 | kfree_skb(l_ptr->reasm_buf); |
401 | l_ptr->reasm_buf = NULL; | |
b97bf3fd PL |
402 | } |
403 | ||
c4307285 | 404 | /** |
581465fa | 405 | * tipc_link_purge_queues - purge all pkt queues associated with link |
b97bf3fd PL |
406 | * @l_ptr: pointer to link |
407 | */ | |
581465fa | 408 | void tipc_link_purge_queues(struct tipc_link *l_ptr) |
b97bf3fd | 409 | { |
bc6fecd4 | 410 | __skb_queue_purge(&l_ptr->deferred_queue); |
58dc55f2 | 411 | __skb_queue_purge(&l_ptr->outqueue); |
4323add6 | 412 | tipc_link_reset_fragments(l_ptr); |
b97bf3fd PL |
413 | } |
414 | ||
a18c4bc3 | 415 | void tipc_link_reset(struct tipc_link *l_ptr) |
b97bf3fd | 416 | { |
b97bf3fd PL |
417 | u32 prev_state = l_ptr->state; |
418 | u32 checkpoint = l_ptr->next_in_no; | |
5392d646 | 419 | int was_active_link = tipc_link_is_active(l_ptr); |
50100a5e | 420 | struct tipc_node *owner = l_ptr->owner; |
c4307285 | 421 | |
a686e685 | 422 | msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff)); |
b97bf3fd | 423 | |
a686e685 AS |
424 | /* Link is down, accept any session */ |
425 | l_ptr->peer_session = INVALID_SESSION; | |
b97bf3fd | 426 | |
c4307285 | 427 | /* Prepare for max packet size negotiation */ |
b97bf3fd | 428 | link_init_max_pkt(l_ptr); |
c4307285 | 429 | |
b97bf3fd | 430 | l_ptr->state = RESET_UNKNOWN; |
b97bf3fd PL |
431 | |
432 | if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET)) | |
433 | return; | |
434 | ||
4323add6 | 435 | tipc_node_link_down(l_ptr->owner, l_ptr); |
7f9f95d9 | 436 | tipc_bearer_remove_dest(owner->net, l_ptr->bearer_id, l_ptr->addr); |
7368ddf1 | 437 | |
b9d4c339 | 438 | if (was_active_link && tipc_node_active_links(l_ptr->owner)) { |
b97bf3fd PL |
439 | l_ptr->reset_checkpoint = checkpoint; |
440 | l_ptr->exp_msg_count = START_CHANGEOVER; | |
441 | } | |
442 | ||
443 | /* Clean up all queues: */ | |
58dc55f2 | 444 | __skb_queue_purge(&l_ptr->outqueue); |
bc6fecd4 | 445 | __skb_queue_purge(&l_ptr->deferred_queue); |
50100a5e JPM |
446 | if (!skb_queue_empty(&l_ptr->waiting_sks)) { |
447 | skb_queue_splice_init(&l_ptr->waiting_sks, &owner->waiting_sks); | |
448 | owner->action_flags |= TIPC_WAKEUP_USERS; | |
449 | } | |
b97bf3fd PL |
450 | l_ptr->next_out = NULL; |
451 | l_ptr->unacked_window = 0; | |
452 | l_ptr->checkpoint = 1; | |
453 | l_ptr->next_out_no = 1; | |
b97bf3fd PL |
454 | l_ptr->fsm_msg_cnt = 0; |
455 | l_ptr->stale_count = 0; | |
456 | link_reset_statistics(l_ptr); | |
b97bf3fd PL |
457 | } |
458 | ||
f2f9800d | 459 | void tipc_link_reset_list(struct net *net, unsigned int bearer_id) |
e0ca2c30 | 460 | { |
f2f9800d | 461 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
e0ca2c30 | 462 | struct tipc_link *l_ptr; |
c61dd61d | 463 | struct tipc_node *n_ptr; |
e0ca2c30 | 464 | |
6c7a762e | 465 | rcu_read_lock(); |
f2f9800d | 466 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
5356f3d7 | 467 | tipc_node_lock(n_ptr); |
c61dd61d YX |
468 | l_ptr = n_ptr->links[bearer_id]; |
469 | if (l_ptr) | |
470 | tipc_link_reset(l_ptr); | |
5356f3d7 | 471 | tipc_node_unlock(n_ptr); |
e0ca2c30 | 472 | } |
6c7a762e | 473 | rcu_read_unlock(); |
e0ca2c30 | 474 | } |
b97bf3fd | 475 | |
7f9f95d9 | 476 | static void link_activate(struct tipc_link *link) |
b97bf3fd | 477 | { |
7f9f95d9 YX |
478 | struct tipc_node *node = link->owner; |
479 | ||
480 | link->next_in_no = 1; | |
481 | link->stats.recv_info = 1; | |
482 | tipc_node_link_up(node, link); | |
483 | tipc_bearer_add_dest(node->net, link->bearer_id, link->addr); | |
b97bf3fd PL |
484 | } |
485 | ||
486 | /** | |
487 | * link_state_event - link finite state machine | |
488 | * @l_ptr: pointer to link | |
489 | * @event: state machine event to process | |
490 | */ | |
95c96174 | 491 | static void link_state_event(struct tipc_link *l_ptr, unsigned int event) |
b97bf3fd | 492 | { |
a18c4bc3 | 493 | struct tipc_link *other; |
2f55c437 | 494 | unsigned long cont_intv = l_ptr->cont_intv; |
b97bf3fd | 495 | |
7d33939f JPM |
496 | if (l_ptr->flags & LINK_STOPPED) |
497 | return; | |
498 | ||
135daee6 | 499 | if (!(l_ptr->flags & LINK_STARTED) && (event != STARTING_EVT)) |
b97bf3fd PL |
500 | return; /* Not yet. */ |
501 | ||
77a7e07a YX |
502 | /* Check whether changeover is going on */ |
503 | if (l_ptr->exp_msg_count) { | |
a016892c | 504 | if (event == TIMEOUT_EVT) |
b97bf3fd | 505 | link_set_timer(l_ptr, cont_intv); |
77a7e07a | 506 | return; |
b97bf3fd | 507 | } |
b97bf3fd PL |
508 | |
509 | switch (l_ptr->state) { | |
510 | case WORKING_WORKING: | |
b97bf3fd PL |
511 | switch (event) { |
512 | case TRAFFIC_MSG_EVT: | |
b97bf3fd | 513 | case ACTIVATE_MSG: |
b97bf3fd PL |
514 | break; |
515 | case TIMEOUT_EVT: | |
b97bf3fd PL |
516 | if (l_ptr->next_in_no != l_ptr->checkpoint) { |
517 | l_ptr->checkpoint = l_ptr->next_in_no; | |
4323add6 | 518 | if (tipc_bclink_acks_missing(l_ptr->owner)) { |
247f0f3c YX |
519 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
520 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
521 | l_ptr->fsm_msg_cnt++; |
522 | } else if (l_ptr->max_pkt < l_ptr->max_pkt_target) { | |
247f0f3c YX |
523 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
524 | 1, 0, 0, 0, 0); | |
b97bf3fd PL |
525 | l_ptr->fsm_msg_cnt++; |
526 | } | |
527 | link_set_timer(l_ptr, cont_intv); | |
528 | break; | |
529 | } | |
b97bf3fd PL |
530 | l_ptr->state = WORKING_UNKNOWN; |
531 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c | 532 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0); |
b97bf3fd PL |
533 | l_ptr->fsm_msg_cnt++; |
534 | link_set_timer(l_ptr, cont_intv / 4); | |
535 | break; | |
536 | case RESET_MSG: | |
2cf8aa19 EH |
537 | pr_info("%s<%s>, requested by peer\n", link_rst_msg, |
538 | l_ptr->name); | |
4323add6 | 539 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
540 | l_ptr->state = RESET_RESET; |
541 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
542 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
543 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
544 | l_ptr->fsm_msg_cnt++; |
545 | link_set_timer(l_ptr, cont_intv); | |
546 | break; | |
547 | default: | |
2cf8aa19 | 548 | pr_err("%s%u in WW state\n", link_unk_evt, event); |
b97bf3fd PL |
549 | } |
550 | break; | |
551 | case WORKING_UNKNOWN: | |
b97bf3fd PL |
552 | switch (event) { |
553 | case TRAFFIC_MSG_EVT: | |
b97bf3fd | 554 | case ACTIVATE_MSG: |
b97bf3fd PL |
555 | l_ptr->state = WORKING_WORKING; |
556 | l_ptr->fsm_msg_cnt = 0; | |
557 | link_set_timer(l_ptr, cont_intv); | |
558 | break; | |
559 | case RESET_MSG: | |
2cf8aa19 EH |
560 | pr_info("%s<%s>, requested by peer while probing\n", |
561 | link_rst_msg, l_ptr->name); | |
4323add6 | 562 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
563 | l_ptr->state = RESET_RESET; |
564 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
565 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
566 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
567 | l_ptr->fsm_msg_cnt++; |
568 | link_set_timer(l_ptr, cont_intv); | |
569 | break; | |
570 | case TIMEOUT_EVT: | |
b97bf3fd | 571 | if (l_ptr->next_in_no != l_ptr->checkpoint) { |
b97bf3fd PL |
572 | l_ptr->state = WORKING_WORKING; |
573 | l_ptr->fsm_msg_cnt = 0; | |
574 | l_ptr->checkpoint = l_ptr->next_in_no; | |
4323add6 | 575 | if (tipc_bclink_acks_missing(l_ptr->owner)) { |
247f0f3c YX |
576 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
577 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
578 | l_ptr->fsm_msg_cnt++; |
579 | } | |
580 | link_set_timer(l_ptr, cont_intv); | |
581 | } else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) { | |
247f0f3c YX |
582 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
583 | 1, 0, 0, 0, 0); | |
b97bf3fd PL |
584 | l_ptr->fsm_msg_cnt++; |
585 | link_set_timer(l_ptr, cont_intv / 4); | |
586 | } else { /* Link has failed */ | |
2cf8aa19 EH |
587 | pr_warn("%s<%s>, peer not responding\n", |
588 | link_rst_msg, l_ptr->name); | |
4323add6 | 589 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
590 | l_ptr->state = RESET_UNKNOWN; |
591 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
592 | tipc_link_proto_xmit(l_ptr, RESET_MSG, |
593 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
594 | l_ptr->fsm_msg_cnt++; |
595 | link_set_timer(l_ptr, cont_intv); | |
596 | } | |
597 | break; | |
598 | default: | |
2cf8aa19 | 599 | pr_err("%s%u in WU state\n", link_unk_evt, event); |
b97bf3fd PL |
600 | } |
601 | break; | |
602 | case RESET_UNKNOWN: | |
b97bf3fd PL |
603 | switch (event) { |
604 | case TRAFFIC_MSG_EVT: | |
b97bf3fd PL |
605 | break; |
606 | case ACTIVATE_MSG: | |
607 | other = l_ptr->owner->active_links[0]; | |
8d64a5ba | 608 | if (other && link_working_unknown(other)) |
b97bf3fd | 609 | break; |
b97bf3fd PL |
610 | l_ptr->state = WORKING_WORKING; |
611 | l_ptr->fsm_msg_cnt = 0; | |
612 | link_activate(l_ptr); | |
247f0f3c | 613 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0); |
b97bf3fd | 614 | l_ptr->fsm_msg_cnt++; |
c64f7a6a | 615 | if (l_ptr->owner->working_links == 1) |
247f0f3c | 616 | tipc_link_sync_xmit(l_ptr); |
b97bf3fd PL |
617 | link_set_timer(l_ptr, cont_intv); |
618 | break; | |
619 | case RESET_MSG: | |
b97bf3fd PL |
620 | l_ptr->state = RESET_RESET; |
621 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
622 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
623 | 1, 0, 0, 0, 0); | |
b97bf3fd PL |
624 | l_ptr->fsm_msg_cnt++; |
625 | link_set_timer(l_ptr, cont_intv); | |
626 | break; | |
627 | case STARTING_EVT: | |
135daee6 | 628 | l_ptr->flags |= LINK_STARTED; |
b97bf3fd PL |
629 | /* fall through */ |
630 | case TIMEOUT_EVT: | |
247f0f3c | 631 | tipc_link_proto_xmit(l_ptr, RESET_MSG, 0, 0, 0, 0, 0); |
b97bf3fd PL |
632 | l_ptr->fsm_msg_cnt++; |
633 | link_set_timer(l_ptr, cont_intv); | |
634 | break; | |
635 | default: | |
2cf8aa19 | 636 | pr_err("%s%u in RU state\n", link_unk_evt, event); |
b97bf3fd PL |
637 | } |
638 | break; | |
639 | case RESET_RESET: | |
b97bf3fd PL |
640 | switch (event) { |
641 | case TRAFFIC_MSG_EVT: | |
b97bf3fd PL |
642 | case ACTIVATE_MSG: |
643 | other = l_ptr->owner->active_links[0]; | |
8d64a5ba | 644 | if (other && link_working_unknown(other)) |
b97bf3fd | 645 | break; |
b97bf3fd PL |
646 | l_ptr->state = WORKING_WORKING; |
647 | l_ptr->fsm_msg_cnt = 0; | |
648 | link_activate(l_ptr); | |
247f0f3c | 649 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0); |
b97bf3fd | 650 | l_ptr->fsm_msg_cnt++; |
c64f7a6a | 651 | if (l_ptr->owner->working_links == 1) |
247f0f3c | 652 | tipc_link_sync_xmit(l_ptr); |
b97bf3fd PL |
653 | link_set_timer(l_ptr, cont_intv); |
654 | break; | |
655 | case RESET_MSG: | |
b97bf3fd PL |
656 | break; |
657 | case TIMEOUT_EVT: | |
247f0f3c YX |
658 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
659 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
660 | l_ptr->fsm_msg_cnt++; |
661 | link_set_timer(l_ptr, cont_intv); | |
b97bf3fd PL |
662 | break; |
663 | default: | |
2cf8aa19 | 664 | pr_err("%s%u in RR state\n", link_unk_evt, event); |
b97bf3fd PL |
665 | } |
666 | break; | |
667 | default: | |
2cf8aa19 | 668 | pr_err("Unknown link state %u/%u\n", l_ptr->state, event); |
b97bf3fd PL |
669 | } |
670 | } | |
671 | ||
4f1688b2 JPM |
672 | /* tipc_link_cong: determine return value and how to treat the |
673 | * sent buffer during link congestion. | |
674 | * - For plain, errorless user data messages we keep the buffer and | |
675 | * return -ELINKONG. | |
676 | * - For all other messages we discard the buffer and return -EHOSTUNREACH | |
677 | * - For TIPC internal messages we also reset the link | |
678 | */ | |
a6ca1094 | 679 | static int tipc_link_cong(struct tipc_link *link, struct sk_buff_head *list) |
4f1688b2 | 680 | { |
a6ca1094 YX |
681 | struct sk_buff *skb = skb_peek(list); |
682 | struct tipc_msg *msg = buf_msg(skb); | |
4f1688b2 JPM |
683 | uint imp = tipc_msg_tot_importance(msg); |
684 | u32 oport = msg_tot_origport(msg); | |
685 | ||
50100a5e | 686 | if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) { |
4f1688b2 JPM |
687 | pr_warn("%s<%s>, send queue full", link_rst_msg, link->name); |
688 | tipc_link_reset(link); | |
50100a5e | 689 | goto drop; |
4f1688b2 | 690 | } |
50100a5e JPM |
691 | if (unlikely(msg_errcode(msg))) |
692 | goto drop; | |
693 | if (unlikely(msg_reroute_cnt(msg))) | |
694 | goto drop; | |
a6ca1094 | 695 | if (TIPC_SKB_CB(skb)->wakeup_pending) |
50100a5e | 696 | return -ELINKCONG; |
a6ca1094 | 697 | if (link_schedule_user(link, oport, skb_queue_len(list), imp)) |
50100a5e JPM |
698 | return -ELINKCONG; |
699 | drop: | |
a6ca1094 | 700 | __skb_queue_purge(list); |
4f1688b2 JPM |
701 | return -EHOSTUNREACH; |
702 | } | |
703 | ||
704 | /** | |
9fbfb8b1 | 705 | * __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked |
4f1688b2 | 706 | * @link: link to use |
a6ca1094 YX |
707 | * @list: chain of buffers containing message |
708 | * | |
4f1688b2 JPM |
709 | * Consumes the buffer chain, except when returning -ELINKCONG |
710 | * Returns 0 if success, otherwise errno: -ELINKCONG, -EMSGSIZE (plain socket | |
711 | * user data messages) or -EHOSTUNREACH (all other messages/senders) | |
712 | * Only the socket functions tipc_send_stream() and tipc_send_packet() need | |
713 | * to act on the return value, since they may need to do more send attempts. | |
714 | */ | |
7f9f95d9 YX |
715 | int __tipc_link_xmit(struct net *net, struct tipc_link *link, |
716 | struct sk_buff_head *list) | |
4f1688b2 | 717 | { |
a6ca1094 | 718 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
4f1688b2 | 719 | uint psz = msg_size(msg); |
4f1688b2 JPM |
720 | uint sndlim = link->queue_limit[0]; |
721 | uint imp = tipc_msg_tot_importance(msg); | |
722 | uint mtu = link->max_pkt; | |
723 | uint ack = mod(link->next_in_no - 1); | |
724 | uint seqno = link->next_out_no; | |
725 | uint bc_last_in = link->owner->bclink.last_in; | |
726 | struct tipc_media_addr *addr = &link->media_addr; | |
58dc55f2 | 727 | struct sk_buff_head *outqueue = &link->outqueue; |
a6ca1094 | 728 | struct sk_buff *skb, *tmp; |
4f1688b2 JPM |
729 | |
730 | /* Match queue limits against msg importance: */ | |
58dc55f2 | 731 | if (unlikely(skb_queue_len(outqueue) >= link->queue_limit[imp])) |
a6ca1094 | 732 | return tipc_link_cong(link, list); |
4f1688b2 JPM |
733 | |
734 | /* Has valid packet limit been used ? */ | |
735 | if (unlikely(psz > mtu)) { | |
a6ca1094 | 736 | __skb_queue_purge(list); |
4f1688b2 JPM |
737 | return -EMSGSIZE; |
738 | } | |
739 | ||
740 | /* Prepare each packet for sending, and add to outqueue: */ | |
a6ca1094 YX |
741 | skb_queue_walk_safe(list, skb, tmp) { |
742 | __skb_unlink(skb, list); | |
58dc55f2 | 743 | msg = buf_msg(skb); |
4f1688b2 JPM |
744 | msg_set_word(msg, 2, ((ack << 16) | mod(seqno))); |
745 | msg_set_bcast_ack(msg, bc_last_in); | |
746 | ||
58dc55f2 YX |
747 | if (skb_queue_len(outqueue) < sndlim) { |
748 | __skb_queue_tail(outqueue, skb); | |
7f9f95d9 YX |
749 | tipc_bearer_send(net, link->bearer_id, |
750 | skb, addr); | |
58dc55f2 YX |
751 | link->next_out = NULL; |
752 | link->unacked_window = 0; | |
753 | } else if (tipc_msg_bundle(outqueue, skb, mtu)) { | |
4f1688b2 | 754 | link->stats.sent_bundled++; |
4f1688b2 | 755 | continue; |
58dc55f2 YX |
756 | } else if (tipc_msg_make_bundle(outqueue, skb, mtu, |
757 | link->addr)) { | |
4f1688b2 JPM |
758 | link->stats.sent_bundled++; |
759 | link->stats.sent_bundles++; | |
4f1688b2 | 760 | if (!link->next_out) |
58dc55f2 | 761 | link->next_out = skb_peek_tail(outqueue); |
4f1688b2 | 762 | } else { |
58dc55f2 | 763 | __skb_queue_tail(outqueue, skb); |
4f1688b2 | 764 | if (!link->next_out) |
58dc55f2 | 765 | link->next_out = skb; |
4f1688b2 JPM |
766 | } |
767 | seqno++; | |
4f1688b2 JPM |
768 | } |
769 | link->next_out_no = seqno; | |
4f1688b2 JPM |
770 | return 0; |
771 | } | |
772 | ||
a6ca1094 YX |
773 | static void skb2list(struct sk_buff *skb, struct sk_buff_head *list) |
774 | { | |
775 | __skb_queue_head_init(list); | |
776 | __skb_queue_tail(list, skb); | |
777 | } | |
778 | ||
779 | static int __tipc_link_xmit_skb(struct tipc_link *link, struct sk_buff *skb) | |
780 | { | |
781 | struct sk_buff_head head; | |
782 | ||
783 | skb2list(skb, &head); | |
7f9f95d9 | 784 | return __tipc_link_xmit(link->owner->net, link, &head); |
a6ca1094 YX |
785 | } |
786 | ||
f2f9800d YX |
787 | int tipc_link_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode, |
788 | u32 selector) | |
a6ca1094 YX |
789 | { |
790 | struct sk_buff_head head; | |
791 | ||
792 | skb2list(skb, &head); | |
f2f9800d | 793 | return tipc_link_xmit(net, &head, dnode, selector); |
a6ca1094 YX |
794 | } |
795 | ||
4f1688b2 | 796 | /** |
9fbfb8b1 | 797 | * tipc_link_xmit() is the general link level function for message sending |
f2f9800d | 798 | * @net: the applicable net namespace |
a6ca1094 | 799 | * @list: chain of buffers containing message |
4f1688b2 JPM |
800 | * @dsz: amount of user data to be sent |
801 | * @dnode: address of destination node | |
802 | * @selector: a number used for deterministic link selection | |
803 | * Consumes the buffer chain, except when returning -ELINKCONG | |
804 | * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE | |
805 | */ | |
f2f9800d YX |
806 | int tipc_link_xmit(struct net *net, struct sk_buff_head *list, u32 dnode, |
807 | u32 selector) | |
4f1688b2 JPM |
808 | { |
809 | struct tipc_link *link = NULL; | |
810 | struct tipc_node *node; | |
811 | int rc = -EHOSTUNREACH; | |
812 | ||
f2f9800d | 813 | node = tipc_node_find(net, dnode); |
4f1688b2 JPM |
814 | if (node) { |
815 | tipc_node_lock(node); | |
816 | link = node->active_links[selector & 1]; | |
817 | if (link) | |
7f9f95d9 | 818 | rc = __tipc_link_xmit(net, link, list); |
4f1688b2 JPM |
819 | tipc_node_unlock(node); |
820 | } | |
821 | ||
822 | if (link) | |
823 | return rc; | |
824 | ||
a6ca1094 YX |
825 | if (likely(in_own_node(dnode))) { |
826 | /* As a node local message chain never contains more than one | |
827 | * buffer, we just need to dequeue one SKB buffer from the | |
828 | * head list. | |
829 | */ | |
f2f9800d | 830 | return tipc_sk_rcv(net, __skb_dequeue(list)); |
a6ca1094 YX |
831 | } |
832 | __skb_queue_purge(list); | |
4f1688b2 | 833 | |
4f1688b2 JPM |
834 | return rc; |
835 | } | |
836 | ||
c64f7a6a | 837 | /* |
247f0f3c | 838 | * tipc_link_sync_xmit - synchronize broadcast link endpoints. |
c64f7a6a JM |
839 | * |
840 | * Give a newly added peer node the sequence number where it should | |
841 | * start receiving and acking broadcast packets. | |
842 | * | |
843 | * Called with node locked | |
844 | */ | |
25b660c7 | 845 | static void tipc_link_sync_xmit(struct tipc_link *link) |
c64f7a6a | 846 | { |
a6ca1094 | 847 | struct sk_buff *skb; |
c64f7a6a JM |
848 | struct tipc_msg *msg; |
849 | ||
a6ca1094 YX |
850 | skb = tipc_buf_acquire(INT_H_SIZE); |
851 | if (!skb) | |
c64f7a6a JM |
852 | return; |
853 | ||
a6ca1094 | 854 | msg = buf_msg(skb); |
25b660c7 JPM |
855 | tipc_msg_init(msg, BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, link->addr); |
856 | msg_set_last_bcast(msg, link->owner->bclink.acked); | |
a6ca1094 | 857 | __tipc_link_xmit_skb(link, skb); |
c64f7a6a JM |
858 | } |
859 | ||
860 | /* | |
247f0f3c | 861 | * tipc_link_sync_rcv - synchronize broadcast link endpoints. |
c64f7a6a JM |
862 | * Receive the sequence number where we should start receiving and |
863 | * acking broadcast packets from a newly added peer node, and open | |
864 | * up for reception of such packets. | |
865 | * | |
866 | * Called with node locked | |
867 | */ | |
247f0f3c | 868 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf) |
c64f7a6a JM |
869 | { |
870 | struct tipc_msg *msg = buf_msg(buf); | |
871 | ||
872 | n->bclink.last_sent = n->bclink.last_in = msg_last_bcast(msg); | |
873 | n->bclink.recv_permitted = true; | |
874 | kfree_skb(buf); | |
875 | } | |
876 | ||
58dc55f2 YX |
877 | struct sk_buff *tipc_skb_queue_next(const struct sk_buff_head *list, |
878 | const struct sk_buff *skb) | |
879 | { | |
880 | if (skb_queue_is_last(list, skb)) | |
881 | return NULL; | |
882 | return skb->next; | |
883 | } | |
884 | ||
c4307285 | 885 | /* |
47b4c9a8 YX |
886 | * tipc_link_push_packets - push unsent packets to bearer |
887 | * | |
888 | * Push out the unsent messages of a link where congestion | |
889 | * has abated. Node is locked. | |
890 | * | |
891 | * Called with node locked | |
b97bf3fd | 892 | */ |
47b4c9a8 | 893 | void tipc_link_push_packets(struct tipc_link *l_ptr) |
b97bf3fd | 894 | { |
58dc55f2 YX |
895 | struct sk_buff_head *outqueue = &l_ptr->outqueue; |
896 | struct sk_buff *skb = l_ptr->next_out; | |
47b4c9a8 YX |
897 | struct tipc_msg *msg; |
898 | u32 next, first; | |
b97bf3fd | 899 | |
58dc55f2 | 900 | skb_queue_walk_from(outqueue, skb) { |
47b4c9a8 YX |
901 | msg = buf_msg(skb); |
902 | next = msg_seqno(msg); | |
58dc55f2 | 903 | first = buf_seqno(skb_peek(outqueue)); |
b97bf3fd PL |
904 | |
905 | if (mod(next - first) < l_ptr->queue_limit[0]) { | |
906 | msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); | |
c4307285 | 907 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
3c294cb3 | 908 | if (msg_user(msg) == MSG_BUNDLER) |
58311d16 | 909 | TIPC_SKB_CB(skb)->bundling = false; |
7f9f95d9 YX |
910 | tipc_bearer_send(l_ptr->owner->net, |
911 | l_ptr->bearer_id, skb, | |
47b4c9a8 | 912 | &l_ptr->media_addr); |
58dc55f2 | 913 | l_ptr->next_out = tipc_skb_queue_next(outqueue, skb); |
47b4c9a8 YX |
914 | } else { |
915 | break; | |
b97bf3fd PL |
916 | } |
917 | } | |
b97bf3fd PL |
918 | } |
919 | ||
3f5a12bd | 920 | void tipc_link_reset_all(struct tipc_node *node) |
d356eeba | 921 | { |
d356eeba AS |
922 | char addr_string[16]; |
923 | u32 i; | |
924 | ||
3f5a12bd | 925 | tipc_node_lock(node); |
d356eeba | 926 | |
2cf8aa19 | 927 | pr_warn("Resetting all links to %s\n", |
3f5a12bd | 928 | tipc_addr_string_fill(addr_string, node->addr)); |
d356eeba AS |
929 | |
930 | for (i = 0; i < MAX_BEARERS; i++) { | |
3f5a12bd YX |
931 | if (node->links[i]) { |
932 | link_print(node->links[i], "Resetting link\n"); | |
933 | tipc_link_reset(node->links[i]); | |
d356eeba AS |
934 | } |
935 | } | |
936 | ||
3f5a12bd | 937 | tipc_node_unlock(node); |
d356eeba AS |
938 | } |
939 | ||
a18c4bc3 | 940 | static void link_retransmit_failure(struct tipc_link *l_ptr, |
ae8509c4 | 941 | struct sk_buff *buf) |
d356eeba AS |
942 | { |
943 | struct tipc_msg *msg = buf_msg(buf); | |
944 | ||
2cf8aa19 | 945 | pr_warn("Retransmission failure on link <%s>\n", l_ptr->name); |
d356eeba AS |
946 | |
947 | if (l_ptr->addr) { | |
d356eeba | 948 | /* Handle failure on standard link */ |
8d64a5ba | 949 | link_print(l_ptr, "Resetting link\n"); |
d356eeba AS |
950 | tipc_link_reset(l_ptr); |
951 | ||
952 | } else { | |
d356eeba | 953 | /* Handle failure on broadcast link */ |
6c00055a | 954 | struct tipc_node *n_ptr; |
d356eeba AS |
955 | char addr_string[16]; |
956 | ||
2cf8aa19 EH |
957 | pr_info("Msg seq number: %u, ", msg_seqno(msg)); |
958 | pr_cont("Outstanding acks: %lu\n", | |
959 | (unsigned long) TIPC_SKB_CB(buf)->handle); | |
617dbeaa | 960 | |
01d83edd | 961 | n_ptr = tipc_bclink_retransmit_to(); |
d356eeba AS |
962 | tipc_node_lock(n_ptr); |
963 | ||
c68ca7b7 | 964 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
2cf8aa19 | 965 | pr_info("Broadcast link info for %s\n", addr_string); |
389dd9bc YX |
966 | pr_info("Reception permitted: %d, Acked: %u\n", |
967 | n_ptr->bclink.recv_permitted, | |
2cf8aa19 EH |
968 | n_ptr->bclink.acked); |
969 | pr_info("Last in: %u, Oos state: %u, Last sent: %u\n", | |
970 | n_ptr->bclink.last_in, | |
971 | n_ptr->bclink.oos_state, | |
972 | n_ptr->bclink.last_sent); | |
d356eeba | 973 | |
d356eeba AS |
974 | tipc_node_unlock(n_ptr); |
975 | ||
3f5a12bd | 976 | tipc_bclink_set_flags(TIPC_BCLINK_RESET); |
d356eeba AS |
977 | l_ptr->stale_count = 0; |
978 | } | |
979 | } | |
980 | ||
58dc55f2 | 981 | void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb, |
4323add6 | 982 | u32 retransmits) |
b97bf3fd PL |
983 | { |
984 | struct tipc_msg *msg; | |
985 | ||
58dc55f2 | 986 | if (!skb) |
d356eeba AS |
987 | return; |
988 | ||
58dc55f2 | 989 | msg = buf_msg(skb); |
c4307285 | 990 | |
512137ee EH |
991 | /* Detect repeated retransmit failures */ |
992 | if (l_ptr->last_retransmitted == msg_seqno(msg)) { | |
993 | if (++l_ptr->stale_count > 100) { | |
58dc55f2 | 994 | link_retransmit_failure(l_ptr, skb); |
512137ee | 995 | return; |
d356eeba AS |
996 | } |
997 | } else { | |
512137ee EH |
998 | l_ptr->last_retransmitted = msg_seqno(msg); |
999 | l_ptr->stale_count = 1; | |
b97bf3fd | 1000 | } |
d356eeba | 1001 | |
58dc55f2 YX |
1002 | skb_queue_walk_from(&l_ptr->outqueue, skb) { |
1003 | if (!retransmits || skb == l_ptr->next_out) | |
1004 | break; | |
1005 | msg = buf_msg(skb); | |
b97bf3fd | 1006 | msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); |
c4307285 | 1007 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
7f9f95d9 YX |
1008 | tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, skb, |
1009 | &l_ptr->media_addr); | |
3c294cb3 YX |
1010 | retransmits--; |
1011 | l_ptr->stats.retransmitted++; | |
b97bf3fd | 1012 | } |
b97bf3fd PL |
1013 | } |
1014 | ||
f03273f1 YX |
1015 | static void link_retrieve_defq(struct tipc_link *link, |
1016 | struct sk_buff_head *list) | |
b97bf3fd PL |
1017 | { |
1018 | u32 seq_no; | |
1019 | ||
f03273f1 YX |
1020 | if (skb_queue_empty(&link->deferred_queue)) |
1021 | return; | |
1022 | ||
1023 | seq_no = buf_seqno(skb_peek(&link->deferred_queue)); | |
1024 | if (seq_no == mod(link->next_in_no)) | |
1025 | skb_queue_splice_tail_init(&link->deferred_queue, list); | |
b97bf3fd PL |
1026 | } |
1027 | ||
85035568 AS |
1028 | /** |
1029 | * link_recv_buf_validate - validate basic format of received message | |
1030 | * | |
1031 | * This routine ensures a TIPC message has an acceptable header, and at least | |
1032 | * as much data as the header indicates it should. The routine also ensures | |
1033 | * that the entire message header is stored in the main fragment of the message | |
1034 | * buffer, to simplify future access to message header fields. | |
1035 | * | |
1036 | * Note: Having extra info present in the message header or data areas is OK. | |
1037 | * TIPC will ignore the excess, under the assumption that it is optional info | |
1038 | * introduced by a later release of the protocol. | |
1039 | */ | |
85035568 AS |
1040 | static int link_recv_buf_validate(struct sk_buff *buf) |
1041 | { | |
1042 | static u32 min_data_hdr_size[8] = { | |
741d9eb7 | 1043 | SHORT_H_SIZE, MCAST_H_SIZE, NAMED_H_SIZE, BASIC_H_SIZE, |
85035568 AS |
1044 | MAX_H_SIZE, MAX_H_SIZE, MAX_H_SIZE, MAX_H_SIZE |
1045 | }; | |
1046 | ||
1047 | struct tipc_msg *msg; | |
1048 | u32 tipc_hdr[2]; | |
1049 | u32 size; | |
1050 | u32 hdr_size; | |
1051 | u32 min_hdr_size; | |
1052 | ||
64380a04 EH |
1053 | /* If this packet comes from the defer queue, the skb has already |
1054 | * been validated | |
1055 | */ | |
1056 | if (unlikely(TIPC_SKB_CB(buf)->deferred)) | |
1057 | return 1; | |
1058 | ||
85035568 AS |
1059 | if (unlikely(buf->len < MIN_H_SIZE)) |
1060 | return 0; | |
1061 | ||
1062 | msg = skb_header_pointer(buf, 0, sizeof(tipc_hdr), tipc_hdr); | |
1063 | if (msg == NULL) | |
1064 | return 0; | |
1065 | ||
1066 | if (unlikely(msg_version(msg) != TIPC_VERSION)) | |
1067 | return 0; | |
1068 | ||
1069 | size = msg_size(msg); | |
1070 | hdr_size = msg_hdr_sz(msg); | |
1071 | min_hdr_size = msg_isdata(msg) ? | |
1072 | min_data_hdr_size[msg_type(msg)] : INT_H_SIZE; | |
1073 | ||
1074 | if (unlikely((hdr_size < min_hdr_size) || | |
1075 | (size < hdr_size) || | |
1076 | (buf->len < size) || | |
1077 | (size - hdr_size > TIPC_MAX_USER_MSG_SIZE))) | |
1078 | return 0; | |
1079 | ||
1080 | return pskb_may_pull(buf, hdr_size); | |
1081 | } | |
1082 | ||
b02b69c8 | 1083 | /** |
170b3927 | 1084 | * tipc_rcv - process TIPC packets/messages arriving from off-node |
f2f9800d | 1085 | * @net: the applicable net namespace |
f03273f1 | 1086 | * @skb: TIPC packet |
7a2f7d18 | 1087 | * @b_ptr: pointer to bearer message arrived on |
b02b69c8 AS |
1088 | * |
1089 | * Invoked with no locks held. Bearer pointer must point to a valid bearer | |
1090 | * structure (i.e. cannot be NULL), but bearer can be inactive. | |
1091 | */ | |
c93d3baa | 1092 | void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr) |
b97bf3fd | 1093 | { |
f03273f1 YX |
1094 | struct sk_buff_head head; |
1095 | struct tipc_node *n_ptr; | |
1096 | struct tipc_link *l_ptr; | |
1097 | struct sk_buff *skb1, *tmp; | |
1098 | struct tipc_msg *msg; | |
1099 | u32 seq_no; | |
1100 | u32 ackd; | |
1101 | u32 released; | |
b97bf3fd | 1102 | |
a6ca1094 | 1103 | skb2list(skb, &head); |
85035568 | 1104 | |
f03273f1 | 1105 | while ((skb = __skb_dequeue(&head))) { |
85035568 | 1106 | /* Ensure message is well-formed */ |
f03273f1 | 1107 | if (unlikely(!link_recv_buf_validate(skb))) |
3af390e2 | 1108 | goto discard; |
b97bf3fd | 1109 | |
fe13dda2 | 1110 | /* Ensure message data is a single contiguous unit */ |
f03273f1 | 1111 | if (unlikely(skb_linearize(skb))) |
3af390e2 | 1112 | goto discard; |
fe13dda2 | 1113 | |
85035568 | 1114 | /* Handle arrival of a non-unicast link message */ |
f03273f1 | 1115 | msg = buf_msg(skb); |
85035568 | 1116 | |
b97bf3fd | 1117 | if (unlikely(msg_non_seq(msg))) { |
1265a021 | 1118 | if (msg_user(msg) == LINK_CONFIG) |
c93d3baa | 1119 | tipc_disc_rcv(net, skb, b_ptr); |
1265a021 | 1120 | else |
c93d3baa | 1121 | tipc_bclink_rcv(net, skb); |
b97bf3fd PL |
1122 | continue; |
1123 | } | |
c4307285 | 1124 | |
ed33a9c4 | 1125 | /* Discard unicast link messages destined for another node */ |
26008247 AS |
1126 | if (unlikely(!msg_short(msg) && |
1127 | (msg_destnode(msg) != tipc_own_addr))) | |
3af390e2 | 1128 | goto discard; |
c4307285 | 1129 | |
5a68d5ee | 1130 | /* Locate neighboring node that sent message */ |
f2f9800d | 1131 | n_ptr = tipc_node_find(net, msg_prevnode(msg)); |
b97bf3fd | 1132 | if (unlikely(!n_ptr)) |
3af390e2 | 1133 | goto discard; |
4323add6 | 1134 | tipc_node_lock(n_ptr); |
85035568 | 1135 | |
b4b56102 | 1136 | /* Locate unicast link endpoint that should handle message */ |
b4b56102 | 1137 | l_ptr = n_ptr->links[b_ptr->identity]; |
3af390e2 YX |
1138 | if (unlikely(!l_ptr)) |
1139 | goto unlock_discard; | |
5a68d5ee | 1140 | |
b4b56102 | 1141 | /* Verify that communication with node is currently allowed */ |
aecb9bb8 | 1142 | if ((n_ptr->action_flags & TIPC_WAIT_PEER_LINKS_DOWN) && |
10f465c4 YX |
1143 | msg_user(msg) == LINK_PROTOCOL && |
1144 | (msg_type(msg) == RESET_MSG || | |
1145 | msg_type(msg) == ACTIVATE_MSG) && | |
1146 | !msg_redundant_link(msg)) | |
aecb9bb8 | 1147 | n_ptr->action_flags &= ~TIPC_WAIT_PEER_LINKS_DOWN; |
10f465c4 YX |
1148 | |
1149 | if (tipc_node_blocked(n_ptr)) | |
3af390e2 | 1150 | goto unlock_discard; |
85035568 AS |
1151 | |
1152 | /* Validate message sequence number info */ | |
85035568 AS |
1153 | seq_no = msg_seqno(msg); |
1154 | ackd = msg_ack(msg); | |
1155 | ||
1156 | /* Release acked messages */ | |
389dd9bc | 1157 | if (n_ptr->bclink.recv_permitted) |
36559591 | 1158 | tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg)); |
b97bf3fd | 1159 | |
58dc55f2 YX |
1160 | released = 0; |
1161 | skb_queue_walk_safe(&l_ptr->outqueue, skb1, tmp) { | |
1162 | if (skb1 == l_ptr->next_out || | |
1163 | more(buf_seqno(skb1), ackd)) | |
1164 | break; | |
1165 | __skb_unlink(skb1, &l_ptr->outqueue); | |
1166 | kfree_skb(skb1); | |
1167 | released = 1; | |
b97bf3fd | 1168 | } |
85035568 AS |
1169 | |
1170 | /* Try sending any messages link endpoint has pending */ | |
b97bf3fd | 1171 | if (unlikely(l_ptr->next_out)) |
47b4c9a8 | 1172 | tipc_link_push_packets(l_ptr); |
a5377831 | 1173 | |
50100a5e JPM |
1174 | if (released && !skb_queue_empty(&l_ptr->waiting_sks)) { |
1175 | link_prepare_wakeup(l_ptr); | |
1176 | l_ptr->owner->action_flags |= TIPC_WAKEUP_USERS; | |
1177 | } | |
a5377831 | 1178 | |
a5377831 | 1179 | /* Process the incoming packet */ |
3af390e2 YX |
1180 | if (unlikely(!link_working_working(l_ptr))) { |
1181 | if (msg_user(msg) == LINK_PROTOCOL) { | |
c93d3baa | 1182 | tipc_link_proto_rcv(net, l_ptr, skb); |
f03273f1 | 1183 | link_retrieve_defq(l_ptr, &head); |
4323add6 | 1184 | tipc_node_unlock(n_ptr); |
b97bf3fd PL |
1185 | continue; |
1186 | } | |
3af390e2 YX |
1187 | |
1188 | /* Traffic message. Conditionally activate link */ | |
1189 | link_state_event(l_ptr, TRAFFIC_MSG_EVT); | |
1190 | ||
1191 | if (link_working_working(l_ptr)) { | |
1192 | /* Re-insert buffer in front of queue */ | |
f03273f1 | 1193 | __skb_queue_head(&head, skb); |
3af390e2 YX |
1194 | tipc_node_unlock(n_ptr); |
1195 | continue; | |
1196 | } | |
1197 | goto unlock_discard; | |
1198 | } | |
1199 | ||
1200 | /* Link is now in state WORKING_WORKING */ | |
1201 | if (unlikely(seq_no != mod(l_ptr->next_in_no))) { | |
c93d3baa | 1202 | link_handle_out_of_seq_msg(net, l_ptr, skb); |
f03273f1 | 1203 | link_retrieve_defq(l_ptr, &head); |
4323add6 | 1204 | tipc_node_unlock(n_ptr); |
b97bf3fd PL |
1205 | continue; |
1206 | } | |
3af390e2 | 1207 | l_ptr->next_in_no++; |
bc6fecd4 | 1208 | if (unlikely(!skb_queue_empty(&l_ptr->deferred_queue))) |
f03273f1 | 1209 | link_retrieve_defq(l_ptr, &head); |
a5377831 | 1210 | |
3f53bd8f EH |
1211 | if (unlikely(++l_ptr->unacked_window >= TIPC_MIN_LINK_WIN)) { |
1212 | l_ptr->stats.sent_acks++; | |
1213 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0); | |
1214 | } | |
1215 | ||
c93d3baa | 1216 | if (tipc_link_prepare_input(net, l_ptr, &skb)) { |
3af390e2 | 1217 | tipc_node_unlock(n_ptr); |
3af390e2 | 1218 | continue; |
b97bf3fd | 1219 | } |
4323add6 | 1220 | tipc_node_unlock(n_ptr); |
f03273f1 | 1221 | |
f2f9800d | 1222 | if (tipc_link_input(net, l_ptr, skb) != 0) |
7ae934be | 1223 | goto discard; |
3af390e2 YX |
1224 | continue; |
1225 | unlock_discard: | |
3af390e2 YX |
1226 | tipc_node_unlock(n_ptr); |
1227 | discard: | |
f03273f1 | 1228 | kfree_skb(skb); |
b97bf3fd | 1229 | } |
b97bf3fd PL |
1230 | } |
1231 | ||
7ae934be EH |
1232 | /** |
1233 | * tipc_link_prepare_input - process TIPC link messages | |
1234 | * | |
1235 | * returns nonzero if the message was consumed | |
1236 | * | |
1237 | * Node lock must be held | |
1238 | */ | |
c93d3baa YX |
1239 | static int tipc_link_prepare_input(struct net *net, struct tipc_link *l, |
1240 | struct sk_buff **buf) | |
7ae934be EH |
1241 | { |
1242 | struct tipc_node *n; | |
1243 | struct tipc_msg *msg; | |
1244 | int res = -EINVAL; | |
1245 | ||
1246 | n = l->owner; | |
1247 | msg = buf_msg(*buf); | |
1248 | switch (msg_user(msg)) { | |
1249 | case CHANGEOVER_PROTOCOL: | |
c93d3baa | 1250 | if (tipc_link_tunnel_rcv(net, n, buf)) |
7ae934be EH |
1251 | res = 0; |
1252 | break; | |
1253 | case MSG_FRAGMENTER: | |
1254 | l->stats.recv_fragments++; | |
1255 | if (tipc_buf_append(&l->reasm_buf, buf)) { | |
1256 | l->stats.recv_fragmented++; | |
1257 | res = 0; | |
1258 | } else if (!l->reasm_buf) { | |
1259 | tipc_link_reset(l); | |
1260 | } | |
1261 | break; | |
1262 | case MSG_BUNDLER: | |
1263 | l->stats.recv_bundles++; | |
1264 | l->stats.recv_bundled += msg_msgcnt(msg); | |
1265 | res = 0; | |
1266 | break; | |
1267 | case NAME_DISTRIBUTOR: | |
1268 | n->bclink.recv_permitted = true; | |
1269 | res = 0; | |
1270 | break; | |
1271 | case BCAST_PROTOCOL: | |
1272 | tipc_link_sync_rcv(n, *buf); | |
1273 | break; | |
1274 | default: | |
1275 | res = 0; | |
1276 | } | |
1277 | return res; | |
1278 | } | |
1279 | /** | |
1280 | * tipc_link_input - Deliver message too higher layers | |
1281 | */ | |
f2f9800d YX |
1282 | static int tipc_link_input(struct net *net, struct tipc_link *l, |
1283 | struct sk_buff *buf) | |
7ae934be EH |
1284 | { |
1285 | struct tipc_msg *msg = buf_msg(buf); | |
1286 | int res = 0; | |
1287 | ||
1288 | switch (msg_user(msg)) { | |
1289 | case TIPC_LOW_IMPORTANCE: | |
1290 | case TIPC_MEDIUM_IMPORTANCE: | |
1291 | case TIPC_HIGH_IMPORTANCE: | |
1292 | case TIPC_CRITICAL_IMPORTANCE: | |
1293 | case CONN_MANAGER: | |
f2f9800d | 1294 | tipc_sk_rcv(net, buf); |
7ae934be EH |
1295 | break; |
1296 | case NAME_DISTRIBUTOR: | |
f2f9800d | 1297 | tipc_named_rcv(net, buf); |
7ae934be EH |
1298 | break; |
1299 | case MSG_BUNDLER: | |
f2f9800d | 1300 | tipc_link_bundle_rcv(net, buf); |
7ae934be EH |
1301 | break; |
1302 | default: | |
1303 | res = -EINVAL; | |
1304 | } | |
1305 | return res; | |
1306 | } | |
1307 | ||
2c53040f | 1308 | /** |
8809b255 AS |
1309 | * tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue |
1310 | * | |
1311 | * Returns increase in queue length (i.e. 0 or 1) | |
b97bf3fd | 1312 | */ |
bc6fecd4 | 1313 | u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb) |
b97bf3fd | 1314 | { |
bc6fecd4 YX |
1315 | struct sk_buff *skb1; |
1316 | u32 seq_no = buf_seqno(skb); | |
b97bf3fd PL |
1317 | |
1318 | /* Empty queue ? */ | |
bc6fecd4 YX |
1319 | if (skb_queue_empty(list)) { |
1320 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1321 | return 1; |
1322 | } | |
1323 | ||
1324 | /* Last ? */ | |
bc6fecd4 YX |
1325 | if (less(buf_seqno(skb_peek_tail(list)), seq_no)) { |
1326 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1327 | return 1; |
1328 | } | |
1329 | ||
8809b255 | 1330 | /* Locate insertion point in queue, then insert; discard if duplicate */ |
bc6fecd4 YX |
1331 | skb_queue_walk(list, skb1) { |
1332 | u32 curr_seqno = buf_seqno(skb1); | |
b97bf3fd | 1333 | |
8809b255 | 1334 | if (seq_no == curr_seqno) { |
bc6fecd4 | 1335 | kfree_skb(skb); |
8809b255 | 1336 | return 0; |
b97bf3fd | 1337 | } |
8809b255 AS |
1338 | |
1339 | if (less(seq_no, curr_seqno)) | |
b97bf3fd | 1340 | break; |
8809b255 | 1341 | } |
b97bf3fd | 1342 | |
bc6fecd4 | 1343 | __skb_queue_before(list, skb1, skb); |
8809b255 | 1344 | return 1; |
b97bf3fd PL |
1345 | } |
1346 | ||
8809b255 | 1347 | /* |
b97bf3fd PL |
1348 | * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet |
1349 | */ | |
c93d3baa YX |
1350 | static void link_handle_out_of_seq_msg(struct net *net, |
1351 | struct tipc_link *l_ptr, | |
b97bf3fd PL |
1352 | struct sk_buff *buf) |
1353 | { | |
f905730c | 1354 | u32 seq_no = buf_seqno(buf); |
b97bf3fd PL |
1355 | |
1356 | if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) { | |
c93d3baa | 1357 | tipc_link_proto_rcv(net, l_ptr, buf); |
b97bf3fd PL |
1358 | return; |
1359 | } | |
1360 | ||
b97bf3fd | 1361 | /* Record OOS packet arrival (force mismatch on next timeout) */ |
b97bf3fd PL |
1362 | l_ptr->checkpoint--; |
1363 | ||
c4307285 | 1364 | /* |
b97bf3fd PL |
1365 | * Discard packet if a duplicate; otherwise add it to deferred queue |
1366 | * and notify peer of gap as per protocol specification | |
1367 | */ | |
b97bf3fd PL |
1368 | if (less(seq_no, mod(l_ptr->next_in_no))) { |
1369 | l_ptr->stats.duplicates++; | |
5f6d9123 | 1370 | kfree_skb(buf); |
b97bf3fd PL |
1371 | return; |
1372 | } | |
1373 | ||
bc6fecd4 | 1374 | if (tipc_link_defer_pkt(&l_ptr->deferred_queue, buf)) { |
b97bf3fd | 1375 | l_ptr->stats.deferred_recv++; |
64380a04 | 1376 | TIPC_SKB_CB(buf)->deferred = true; |
bc6fecd4 | 1377 | if ((skb_queue_len(&l_ptr->deferred_queue) % 16) == 1) |
247f0f3c | 1378 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0); |
bc6fecd4 | 1379 | } else { |
b97bf3fd | 1380 | l_ptr->stats.duplicates++; |
bc6fecd4 | 1381 | } |
b97bf3fd PL |
1382 | } |
1383 | ||
1384 | /* | |
1385 | * Send protocol message to the other endpoint. | |
1386 | */ | |
247f0f3c YX |
1387 | void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg, |
1388 | u32 gap, u32 tolerance, u32 priority, u32 ack_mtu) | |
b97bf3fd | 1389 | { |
1fc54d8f | 1390 | struct sk_buff *buf = NULL; |
b97bf3fd | 1391 | struct tipc_msg *msg = l_ptr->pmsg; |
c4307285 | 1392 | u32 msg_size = sizeof(l_ptr->proto_msg); |
75f0aa49 | 1393 | int r_flag; |
b97bf3fd | 1394 | |
77a7e07a YX |
1395 | /* Don't send protocol message during link changeover */ |
1396 | if (l_ptr->exp_msg_count) | |
b97bf3fd | 1397 | return; |
b4b56102 AS |
1398 | |
1399 | /* Abort non-RESET send if communication with node is prohibited */ | |
10f465c4 | 1400 | if ((tipc_node_blocked(l_ptr->owner)) && (msg_typ != RESET_MSG)) |
b4b56102 AS |
1401 | return; |
1402 | ||
92d2c905 | 1403 | /* Create protocol message with "out-of-sequence" sequence number */ |
b97bf3fd | 1404 | msg_set_type(msg, msg_typ); |
7a2f7d18 | 1405 | msg_set_net_plane(msg, l_ptr->net_plane); |
7a54d4a9 | 1406 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
4323add6 | 1407 | msg_set_last_bcast(msg, tipc_bclink_get_last_sent()); |
b97bf3fd PL |
1408 | |
1409 | if (msg_typ == STATE_MSG) { | |
1410 | u32 next_sent = mod(l_ptr->next_out_no); | |
1411 | ||
4323add6 | 1412 | if (!tipc_link_is_up(l_ptr)) |
b97bf3fd PL |
1413 | return; |
1414 | if (l_ptr->next_out) | |
f905730c | 1415 | next_sent = buf_seqno(l_ptr->next_out); |
b97bf3fd | 1416 | msg_set_next_sent(msg, next_sent); |
bc6fecd4 YX |
1417 | if (!skb_queue_empty(&l_ptr->deferred_queue)) { |
1418 | u32 rec = buf_seqno(skb_peek(&l_ptr->deferred_queue)); | |
b97bf3fd PL |
1419 | gap = mod(rec - mod(l_ptr->next_in_no)); |
1420 | } | |
1421 | msg_set_seq_gap(msg, gap); | |
1422 | if (gap) | |
1423 | l_ptr->stats.sent_nacks++; | |
1424 | msg_set_link_tolerance(msg, tolerance); | |
1425 | msg_set_linkprio(msg, priority); | |
1426 | msg_set_max_pkt(msg, ack_mtu); | |
1427 | msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); | |
1428 | msg_set_probe(msg, probe_msg != 0); | |
c4307285 | 1429 | if (probe_msg) { |
b97bf3fd PL |
1430 | u32 mtu = l_ptr->max_pkt; |
1431 | ||
c4307285 | 1432 | if ((mtu < l_ptr->max_pkt_target) && |
b97bf3fd PL |
1433 | link_working_working(l_ptr) && |
1434 | l_ptr->fsm_msg_cnt) { | |
1435 | msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3; | |
c4307285 YH |
1436 | if (l_ptr->max_pkt_probes == 10) { |
1437 | l_ptr->max_pkt_target = (msg_size - 4); | |
1438 | l_ptr->max_pkt_probes = 0; | |
b97bf3fd | 1439 | msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3; |
c4307285 | 1440 | } |
b97bf3fd | 1441 | l_ptr->max_pkt_probes++; |
c4307285 | 1442 | } |
b97bf3fd PL |
1443 | |
1444 | l_ptr->stats.sent_probes++; | |
c4307285 | 1445 | } |
b97bf3fd PL |
1446 | l_ptr->stats.sent_states++; |
1447 | } else { /* RESET_MSG or ACTIVATE_MSG */ | |
1448 | msg_set_ack(msg, mod(l_ptr->reset_checkpoint - 1)); | |
1449 | msg_set_seq_gap(msg, 0); | |
1450 | msg_set_next_sent(msg, 1); | |
f23d9bf2 | 1451 | msg_set_probe(msg, 0); |
b97bf3fd PL |
1452 | msg_set_link_tolerance(msg, l_ptr->tolerance); |
1453 | msg_set_linkprio(msg, l_ptr->priority); | |
1454 | msg_set_max_pkt(msg, l_ptr->max_pkt_target); | |
1455 | } | |
1456 | ||
75f0aa49 AS |
1457 | r_flag = (l_ptr->owner->working_links > tipc_link_is_up(l_ptr)); |
1458 | msg_set_redundant_link(msg, r_flag); | |
b97bf3fd | 1459 | msg_set_linkprio(msg, l_ptr->priority); |
92d2c905 | 1460 | msg_set_size(msg, msg_size); |
b97bf3fd PL |
1461 | |
1462 | msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2))); | |
1463 | ||
31e3c3f6 | 1464 | buf = tipc_buf_acquire(msg_size); |
b97bf3fd PL |
1465 | if (!buf) |
1466 | return; | |
1467 | ||
27d7ff46 | 1468 | skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg)); |
796c75d0 | 1469 | buf->priority = TC_PRIO_CONTROL; |
b97bf3fd | 1470 | |
7f9f95d9 YX |
1471 | tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, buf, |
1472 | &l_ptr->media_addr); | |
92d2c905 | 1473 | l_ptr->unacked_window = 0; |
5f6d9123 | 1474 | kfree_skb(buf); |
b97bf3fd PL |
1475 | } |
1476 | ||
1477 | /* | |
1478 | * Receive protocol message : | |
c4307285 YH |
1479 | * Note that network plane id propagates through the network, and may |
1480 | * change at any time. The node with lowest address rules | |
b97bf3fd | 1481 | */ |
c93d3baa YX |
1482 | static void tipc_link_proto_rcv(struct net *net, struct tipc_link *l_ptr, |
1483 | struct sk_buff *buf) | |
b97bf3fd PL |
1484 | { |
1485 | u32 rec_gap = 0; | |
1486 | u32 max_pkt_info; | |
c4307285 | 1487 | u32 max_pkt_ack; |
b97bf3fd PL |
1488 | u32 msg_tol; |
1489 | struct tipc_msg *msg = buf_msg(buf); | |
1490 | ||
77a7e07a YX |
1491 | /* Discard protocol message during link changeover */ |
1492 | if (l_ptr->exp_msg_count) | |
b97bf3fd PL |
1493 | goto exit; |
1494 | ||
7a2f7d18 | 1495 | if (l_ptr->net_plane != msg_net_plane(msg)) |
b97bf3fd | 1496 | if (tipc_own_addr > msg_prevnode(msg)) |
7a2f7d18 | 1497 | l_ptr->net_plane = msg_net_plane(msg); |
b97bf3fd | 1498 | |
b97bf3fd | 1499 | switch (msg_type(msg)) { |
c4307285 | 1500 | |
b97bf3fd | 1501 | case RESET_MSG: |
a686e685 AS |
1502 | if (!link_working_unknown(l_ptr) && |
1503 | (l_ptr->peer_session != INVALID_SESSION)) { | |
641c218d AS |
1504 | if (less_eq(msg_session(msg), l_ptr->peer_session)) |
1505 | break; /* duplicate or old reset: ignore */ | |
b97bf3fd | 1506 | } |
b4b56102 AS |
1507 | |
1508 | if (!msg_redundant_link(msg) && (link_working_working(l_ptr) || | |
1509 | link_working_unknown(l_ptr))) { | |
1510 | /* | |
1511 | * peer has lost contact -- don't allow peer's links | |
1512 | * to reactivate before we recognize loss & clean up | |
1513 | */ | |
ca9cf06a | 1514 | l_ptr->owner->action_flags |= TIPC_WAIT_OWN_LINKS_DOWN; |
b4b56102 AS |
1515 | } |
1516 | ||
47361c87 AS |
1517 | link_state_event(l_ptr, RESET_MSG); |
1518 | ||
b97bf3fd PL |
1519 | /* fall thru' */ |
1520 | case ACTIVATE_MSG: | |
1521 | /* Update link settings according other endpoint's values */ | |
b97bf3fd PL |
1522 | strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg)); |
1523 | ||
2db9983a AS |
1524 | msg_tol = msg_link_tolerance(msg); |
1525 | if (msg_tol > l_ptr->tolerance) | |
b97bf3fd PL |
1526 | link_set_supervision_props(l_ptr, msg_tol); |
1527 | ||
1528 | if (msg_linkprio(msg) > l_ptr->priority) | |
1529 | l_ptr->priority = msg_linkprio(msg); | |
1530 | ||
1531 | max_pkt_info = msg_max_pkt(msg); | |
c4307285 | 1532 | if (max_pkt_info) { |
b97bf3fd PL |
1533 | if (max_pkt_info < l_ptr->max_pkt_target) |
1534 | l_ptr->max_pkt_target = max_pkt_info; | |
1535 | if (l_ptr->max_pkt > l_ptr->max_pkt_target) | |
1536 | l_ptr->max_pkt = l_ptr->max_pkt_target; | |
1537 | } else { | |
c4307285 | 1538 | l_ptr->max_pkt = l_ptr->max_pkt_target; |
b97bf3fd | 1539 | } |
b97bf3fd | 1540 | |
4d75313c | 1541 | /* Synchronize broadcast link info, if not done previously */ |
7a54d4a9 AS |
1542 | if (!tipc_node_is_up(l_ptr->owner)) { |
1543 | l_ptr->owner->bclink.last_sent = | |
1544 | l_ptr->owner->bclink.last_in = | |
1545 | msg_last_bcast(msg); | |
1546 | l_ptr->owner->bclink.oos_state = 0; | |
1547 | } | |
4d75313c | 1548 | |
b97bf3fd PL |
1549 | l_ptr->peer_session = msg_session(msg); |
1550 | l_ptr->peer_bearer_id = msg_bearer_id(msg); | |
47361c87 AS |
1551 | |
1552 | if (msg_type(msg) == ACTIVATE_MSG) | |
1553 | link_state_event(l_ptr, ACTIVATE_MSG); | |
b97bf3fd PL |
1554 | break; |
1555 | case STATE_MSG: | |
1556 | ||
2db9983a AS |
1557 | msg_tol = msg_link_tolerance(msg); |
1558 | if (msg_tol) | |
b97bf3fd | 1559 | link_set_supervision_props(l_ptr, msg_tol); |
c4307285 YH |
1560 | |
1561 | if (msg_linkprio(msg) && | |
b97bf3fd | 1562 | (msg_linkprio(msg) != l_ptr->priority)) { |
2cf8aa19 EH |
1563 | pr_warn("%s<%s>, priority change %u->%u\n", |
1564 | link_rst_msg, l_ptr->name, l_ptr->priority, | |
1565 | msg_linkprio(msg)); | |
b97bf3fd | 1566 | l_ptr->priority = msg_linkprio(msg); |
4323add6 | 1567 | tipc_link_reset(l_ptr); /* Enforce change to take effect */ |
b97bf3fd PL |
1568 | break; |
1569 | } | |
ec37dcd3 JPM |
1570 | |
1571 | /* Record reception; force mismatch at next timeout: */ | |
1572 | l_ptr->checkpoint--; | |
1573 | ||
b97bf3fd PL |
1574 | link_state_event(l_ptr, TRAFFIC_MSG_EVT); |
1575 | l_ptr->stats.recv_states++; | |
1576 | if (link_reset_unknown(l_ptr)) | |
1577 | break; | |
1578 | ||
1579 | if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) { | |
c4307285 | 1580 | rec_gap = mod(msg_next_sent(msg) - |
b97bf3fd PL |
1581 | mod(l_ptr->next_in_no)); |
1582 | } | |
1583 | ||
1584 | max_pkt_ack = msg_max_pkt(msg); | |
c4307285 | 1585 | if (max_pkt_ack > l_ptr->max_pkt) { |
c4307285 YH |
1586 | l_ptr->max_pkt = max_pkt_ack; |
1587 | l_ptr->max_pkt_probes = 0; | |
1588 | } | |
b97bf3fd PL |
1589 | |
1590 | max_pkt_ack = 0; | |
c4307285 | 1591 | if (msg_probe(msg)) { |
b97bf3fd | 1592 | l_ptr->stats.recv_probes++; |
a016892c | 1593 | if (msg_size(msg) > sizeof(l_ptr->proto_msg)) |
c4307285 | 1594 | max_pkt_ack = msg_size(msg); |
c4307285 | 1595 | } |
b97bf3fd PL |
1596 | |
1597 | /* Protocol message before retransmits, reduce loss risk */ | |
389dd9bc | 1598 | if (l_ptr->owner->bclink.recv_permitted) |
c93d3baa | 1599 | tipc_bclink_update_link_state(net, l_ptr->owner, |
7a54d4a9 | 1600 | msg_last_bcast(msg)); |
b97bf3fd PL |
1601 | |
1602 | if (rec_gap || (msg_probe(msg))) { | |
247f0f3c YX |
1603 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, rec_gap, 0, |
1604 | 0, max_pkt_ack); | |
b97bf3fd PL |
1605 | } |
1606 | if (msg_seq_gap(msg)) { | |
b97bf3fd | 1607 | l_ptr->stats.recv_nacks++; |
58dc55f2 | 1608 | tipc_link_retransmit(l_ptr, skb_peek(&l_ptr->outqueue), |
4323add6 | 1609 | msg_seq_gap(msg)); |
b97bf3fd PL |
1610 | } |
1611 | break; | |
b97bf3fd PL |
1612 | } |
1613 | exit: | |
5f6d9123 | 1614 | kfree_skb(buf); |
b97bf3fd PL |
1615 | } |
1616 | ||
1617 | ||
170b3927 JPM |
1618 | /* tipc_link_tunnel_xmit(): Tunnel one packet via a link belonging to |
1619 | * a different bearer. Owner node is locked. | |
b97bf3fd | 1620 | */ |
170b3927 JPM |
1621 | static void tipc_link_tunnel_xmit(struct tipc_link *l_ptr, |
1622 | struct tipc_msg *tunnel_hdr, | |
1623 | struct tipc_msg *msg, | |
1624 | u32 selector) | |
b97bf3fd | 1625 | { |
a18c4bc3 | 1626 | struct tipc_link *tunnel; |
a6ca1094 | 1627 | struct sk_buff *skb; |
b97bf3fd PL |
1628 | u32 length = msg_size(msg); |
1629 | ||
1630 | tunnel = l_ptr->owner->active_links[selector & 1]; | |
5392d646 | 1631 | if (!tipc_link_is_up(tunnel)) { |
2cf8aa19 | 1632 | pr_warn("%stunnel link no longer available\n", link_co_err); |
b97bf3fd | 1633 | return; |
5392d646 | 1634 | } |
b97bf3fd | 1635 | msg_set_size(tunnel_hdr, length + INT_H_SIZE); |
a6ca1094 YX |
1636 | skb = tipc_buf_acquire(length + INT_H_SIZE); |
1637 | if (!skb) { | |
2cf8aa19 | 1638 | pr_warn("%sunable to send tunnel msg\n", link_co_err); |
b97bf3fd | 1639 | return; |
5392d646 | 1640 | } |
a6ca1094 YX |
1641 | skb_copy_to_linear_data(skb, tunnel_hdr, INT_H_SIZE); |
1642 | skb_copy_to_linear_data_offset(skb, INT_H_SIZE, msg, length); | |
1643 | __tipc_link_xmit_skb(tunnel, skb); | |
b97bf3fd PL |
1644 | } |
1645 | ||
1646 | ||
170b3927 JPM |
1647 | /* tipc_link_failover_send_queue(): A link has gone down, but a second |
1648 | * link is still active. We can do failover. Tunnel the failing link's | |
1649 | * whole send queue via the remaining link. This way, we don't lose | |
1650 | * any packets, and sequence order is preserved for subsequent traffic | |
1651 | * sent over the remaining link. Owner node is locked. | |
b97bf3fd | 1652 | */ |
170b3927 | 1653 | void tipc_link_failover_send_queue(struct tipc_link *l_ptr) |
b97bf3fd | 1654 | { |
58dc55f2 | 1655 | u32 msgcount = skb_queue_len(&l_ptr->outqueue); |
a18c4bc3 | 1656 | struct tipc_link *tunnel = l_ptr->owner->active_links[0]; |
b97bf3fd | 1657 | struct tipc_msg tunnel_hdr; |
58dc55f2 | 1658 | struct sk_buff *skb; |
5392d646 | 1659 | int split_bundles; |
b97bf3fd PL |
1660 | |
1661 | if (!tunnel) | |
1662 | return; | |
1663 | ||
c68ca7b7 | 1664 | tipc_msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL, |
75715217 | 1665 | ORIGINAL_MSG, INT_H_SIZE, l_ptr->addr); |
b97bf3fd PL |
1666 | msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id); |
1667 | msg_set_msgcnt(&tunnel_hdr, msgcount); | |
f131072c | 1668 | |
58dc55f2 YX |
1669 | if (skb_queue_empty(&l_ptr->outqueue)) { |
1670 | skb = tipc_buf_acquire(INT_H_SIZE); | |
1671 | if (skb) { | |
1672 | skb_copy_to_linear_data(skb, &tunnel_hdr, INT_H_SIZE); | |
b97bf3fd | 1673 | msg_set_size(&tunnel_hdr, INT_H_SIZE); |
a6ca1094 | 1674 | __tipc_link_xmit_skb(tunnel, skb); |
b97bf3fd | 1675 | } else { |
2cf8aa19 EH |
1676 | pr_warn("%sunable to send changeover msg\n", |
1677 | link_co_err); | |
b97bf3fd PL |
1678 | } |
1679 | return; | |
1680 | } | |
f131072c | 1681 | |
c4307285 | 1682 | split_bundles = (l_ptr->owner->active_links[0] != |
5392d646 AS |
1683 | l_ptr->owner->active_links[1]); |
1684 | ||
58dc55f2 YX |
1685 | skb_queue_walk(&l_ptr->outqueue, skb) { |
1686 | struct tipc_msg *msg = buf_msg(skb); | |
b97bf3fd PL |
1687 | |
1688 | if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) { | |
b97bf3fd | 1689 | struct tipc_msg *m = msg_get_wrapped(msg); |
0e65967e | 1690 | unchar *pos = (unchar *)m; |
b97bf3fd | 1691 | |
d788d805 | 1692 | msgcount = msg_msgcnt(msg); |
b97bf3fd | 1693 | while (msgcount--) { |
0e65967e | 1694 | msg_set_seqno(m, msg_seqno(msg)); |
170b3927 JPM |
1695 | tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, m, |
1696 | msg_link_selector(m)); | |
b97bf3fd PL |
1697 | pos += align(msg_size(m)); |
1698 | m = (struct tipc_msg *)pos; | |
1699 | } | |
1700 | } else { | |
170b3927 JPM |
1701 | tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, msg, |
1702 | msg_link_selector(msg)); | |
b97bf3fd | 1703 | } |
b97bf3fd PL |
1704 | } |
1705 | } | |
1706 | ||
247f0f3c | 1707 | /* tipc_link_dup_queue_xmit(): A second link has become active. Tunnel a |
170b3927 JPM |
1708 | * duplicate of the first link's send queue via the new link. This way, we |
1709 | * are guaranteed that currently queued packets from a socket are delivered | |
1710 | * before future traffic from the same socket, even if this is using the | |
1711 | * new link. The last arriving copy of each duplicate packet is dropped at | |
1712 | * the receiving end by the regular protocol check, so packet cardinality | |
1713 | * and sequence order is preserved per sender/receiver socket pair. | |
1714 | * Owner node is locked. | |
1715 | */ | |
247f0f3c | 1716 | void tipc_link_dup_queue_xmit(struct tipc_link *l_ptr, |
170b3927 | 1717 | struct tipc_link *tunnel) |
b97bf3fd | 1718 | { |
58dc55f2 | 1719 | struct sk_buff *skb; |
b97bf3fd PL |
1720 | struct tipc_msg tunnel_hdr; |
1721 | ||
c68ca7b7 | 1722 | tipc_msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL, |
75715217 | 1723 | DUPLICATE_MSG, INT_H_SIZE, l_ptr->addr); |
58dc55f2 | 1724 | msg_set_msgcnt(&tunnel_hdr, skb_queue_len(&l_ptr->outqueue)); |
b97bf3fd | 1725 | msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id); |
58dc55f2 YX |
1726 | skb_queue_walk(&l_ptr->outqueue, skb) { |
1727 | struct sk_buff *outskb; | |
1728 | struct tipc_msg *msg = buf_msg(skb); | |
b97bf3fd PL |
1729 | u32 length = msg_size(msg); |
1730 | ||
1731 | if (msg_user(msg) == MSG_BUNDLER) | |
1732 | msg_set_type(msg, CLOSED_MSG); | |
1733 | msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); /* Update */ | |
c4307285 | 1734 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
b97bf3fd | 1735 | msg_set_size(&tunnel_hdr, length + INT_H_SIZE); |
58dc55f2 YX |
1736 | outskb = tipc_buf_acquire(length + INT_H_SIZE); |
1737 | if (outskb == NULL) { | |
2cf8aa19 EH |
1738 | pr_warn("%sunable to send duplicate msg\n", |
1739 | link_co_err); | |
b97bf3fd PL |
1740 | return; |
1741 | } | |
58dc55f2 YX |
1742 | skb_copy_to_linear_data(outskb, &tunnel_hdr, INT_H_SIZE); |
1743 | skb_copy_to_linear_data_offset(outskb, INT_H_SIZE, skb->data, | |
27d7ff46 | 1744 | length); |
a6ca1094 | 1745 | __tipc_link_xmit_skb(tunnel, outskb); |
4323add6 | 1746 | if (!tipc_link_is_up(l_ptr)) |
b97bf3fd | 1747 | return; |
b97bf3fd PL |
1748 | } |
1749 | } | |
1750 | ||
b97bf3fd PL |
1751 | /** |
1752 | * buf_extract - extracts embedded TIPC message from another message | |
1753 | * @skb: encapsulating message buffer | |
1754 | * @from_pos: offset to extract from | |
1755 | * | |
c4307285 | 1756 | * Returns a new message buffer containing an embedded message. The |
b97bf3fd PL |
1757 | * encapsulating message itself is left unchanged. |
1758 | */ | |
b97bf3fd PL |
1759 | static struct sk_buff *buf_extract(struct sk_buff *skb, u32 from_pos) |
1760 | { | |
1761 | struct tipc_msg *msg = (struct tipc_msg *)(skb->data + from_pos); | |
1762 | u32 size = msg_size(msg); | |
1763 | struct sk_buff *eb; | |
1764 | ||
31e3c3f6 | 1765 | eb = tipc_buf_acquire(size); |
b97bf3fd | 1766 | if (eb) |
27d7ff46 | 1767 | skb_copy_to_linear_data(eb, msg, size); |
b97bf3fd PL |
1768 | return eb; |
1769 | } | |
1770 | ||
1dab3d5a JPM |
1771 | |
1772 | ||
1773 | /* tipc_link_dup_rcv(): Receive a tunnelled DUPLICATE_MSG packet. | |
1774 | * Owner node is locked. | |
1775 | */ | |
c93d3baa | 1776 | static void tipc_link_dup_rcv(struct net *net, struct tipc_link *l_ptr, |
1dab3d5a JPM |
1777 | struct sk_buff *t_buf) |
1778 | { | |
1779 | struct sk_buff *buf; | |
1780 | ||
1781 | if (!tipc_link_is_up(l_ptr)) | |
1782 | return; | |
1783 | ||
1784 | buf = buf_extract(t_buf, INT_H_SIZE); | |
1785 | if (buf == NULL) { | |
1786 | pr_warn("%sfailed to extract inner dup pkt\n", link_co_err); | |
1787 | return; | |
1788 | } | |
1789 | ||
1790 | /* Add buffer to deferred queue, if applicable: */ | |
c93d3baa | 1791 | link_handle_out_of_seq_msg(net, l_ptr, buf); |
1dab3d5a JPM |
1792 | } |
1793 | ||
f006c9c7 JPM |
1794 | /* tipc_link_failover_rcv(): Receive a tunnelled ORIGINAL_MSG packet |
1795 | * Owner node is locked. | |
1796 | */ | |
1797 | static struct sk_buff *tipc_link_failover_rcv(struct tipc_link *l_ptr, | |
1798 | struct sk_buff *t_buf) | |
1799 | { | |
1800 | struct tipc_msg *t_msg = buf_msg(t_buf); | |
1801 | struct sk_buff *buf = NULL; | |
1802 | struct tipc_msg *msg; | |
1803 | ||
1804 | if (tipc_link_is_up(l_ptr)) | |
1805 | tipc_link_reset(l_ptr); | |
1806 | ||
1807 | /* First failover packet? */ | |
1808 | if (l_ptr->exp_msg_count == START_CHANGEOVER) | |
1809 | l_ptr->exp_msg_count = msg_msgcnt(t_msg); | |
1810 | ||
1811 | /* Should there be an inner packet? */ | |
1812 | if (l_ptr->exp_msg_count) { | |
1813 | l_ptr->exp_msg_count--; | |
1814 | buf = buf_extract(t_buf, INT_H_SIZE); | |
1815 | if (buf == NULL) { | |
1816 | pr_warn("%sno inner failover pkt\n", link_co_err); | |
1817 | goto exit; | |
1818 | } | |
1819 | msg = buf_msg(buf); | |
1820 | ||
1821 | if (less(msg_seqno(msg), l_ptr->reset_checkpoint)) { | |
1822 | kfree_skb(buf); | |
1823 | buf = NULL; | |
1824 | goto exit; | |
1825 | } | |
1826 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
1827 | l_ptr->stats.recv_fragments++; | |
37e22164 | 1828 | tipc_buf_append(&l_ptr->reasm_buf, &buf); |
f006c9c7 JPM |
1829 | } |
1830 | } | |
f006c9c7 | 1831 | exit: |
7d33939f JPM |
1832 | if ((l_ptr->exp_msg_count == 0) && (l_ptr->flags & LINK_STOPPED)) { |
1833 | tipc_node_detach_link(l_ptr->owner, l_ptr); | |
1834 | kfree(l_ptr); | |
1835 | } | |
f006c9c7 JPM |
1836 | return buf; |
1837 | } | |
1838 | ||
1dab3d5a | 1839 | /* tipc_link_tunnel_rcv(): Receive a tunnelled packet, sent |
170b3927 JPM |
1840 | * via other link as result of a failover (ORIGINAL_MSG) or |
1841 | * a new active link (DUPLICATE_MSG). Failover packets are | |
1842 | * returned to the active link for delivery upwards. | |
1843 | * Owner node is locked. | |
b97bf3fd | 1844 | */ |
c93d3baa | 1845 | static int tipc_link_tunnel_rcv(struct net *net, struct tipc_node *n_ptr, |
170b3927 | 1846 | struct sk_buff **buf) |
b97bf3fd | 1847 | { |
02842f71 JPM |
1848 | struct sk_buff *t_buf = *buf; |
1849 | struct tipc_link *l_ptr; | |
1850 | struct tipc_msg *t_msg = buf_msg(t_buf); | |
1851 | u32 bearer_id = msg_bearer_id(t_msg); | |
b97bf3fd | 1852 | |
1e9d47a9 JPM |
1853 | *buf = NULL; |
1854 | ||
cb4b102f DC |
1855 | if (bearer_id >= MAX_BEARERS) |
1856 | goto exit; | |
1dab3d5a | 1857 | |
02842f71 JPM |
1858 | l_ptr = n_ptr->links[bearer_id]; |
1859 | if (!l_ptr) | |
b97bf3fd | 1860 | goto exit; |
b97bf3fd | 1861 | |
02842f71 | 1862 | if (msg_type(t_msg) == DUPLICATE_MSG) |
c93d3baa | 1863 | tipc_link_dup_rcv(net, l_ptr, t_buf); |
02842f71 JPM |
1864 | else if (msg_type(t_msg) == ORIGINAL_MSG) |
1865 | *buf = tipc_link_failover_rcv(l_ptr, t_buf); | |
1e9d47a9 JPM |
1866 | else |
1867 | pr_warn("%sunknown tunnel pkt received\n", link_co_err); | |
b97bf3fd | 1868 | exit: |
02842f71 | 1869 | kfree_skb(t_buf); |
1e9d47a9 | 1870 | return *buf != NULL; |
b97bf3fd PL |
1871 | } |
1872 | ||
1873 | /* | |
1874 | * Bundler functionality: | |
1875 | */ | |
f2f9800d | 1876 | void tipc_link_bundle_rcv(struct net *net, struct sk_buff *buf) |
b97bf3fd PL |
1877 | { |
1878 | u32 msgcount = msg_msgcnt(buf_msg(buf)); | |
1879 | u32 pos = INT_H_SIZE; | |
1880 | struct sk_buff *obuf; | |
ec8a2e56 | 1881 | struct tipc_msg *omsg; |
b97bf3fd | 1882 | |
b97bf3fd PL |
1883 | while (msgcount--) { |
1884 | obuf = buf_extract(buf, pos); | |
1885 | if (obuf == NULL) { | |
2cf8aa19 | 1886 | pr_warn("Link unable to unbundle message(s)\n"); |
a10bd924 | 1887 | break; |
3ff50b79 | 1888 | } |
ec8a2e56 JPM |
1889 | omsg = buf_msg(obuf); |
1890 | pos += align(msg_size(omsg)); | |
643566d4 JPM |
1891 | if (msg_isdata(omsg)) { |
1892 | if (unlikely(msg_type(omsg) == TIPC_MCAST_MSG)) | |
f2f9800d | 1893 | tipc_sk_mcast_rcv(net, obuf); |
643566d4 | 1894 | else |
f2f9800d | 1895 | tipc_sk_rcv(net, obuf); |
643566d4 | 1896 | } else if (msg_user(omsg) == CONN_MANAGER) { |
f2f9800d | 1897 | tipc_sk_rcv(net, obuf); |
ec8a2e56 | 1898 | } else if (msg_user(omsg) == NAME_DISTRIBUTOR) { |
f2f9800d | 1899 | tipc_named_rcv(net, obuf); |
ec8a2e56 JPM |
1900 | } else { |
1901 | pr_warn("Illegal bundled msg: %u\n", msg_user(omsg)); | |
1902 | kfree_skb(obuf); | |
1903 | } | |
b97bf3fd | 1904 | } |
5f6d9123 | 1905 | kfree_skb(buf); |
b97bf3fd PL |
1906 | } |
1907 | ||
2f55c437 | 1908 | static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol) |
b97bf3fd | 1909 | { |
2f55c437 YX |
1910 | unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4; |
1911 | ||
1912 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
5413b4c6 AS |
1913 | return; |
1914 | ||
2f55c437 YX |
1915 | l_ptr->tolerance = tol; |
1916 | l_ptr->cont_intv = msecs_to_jiffies(intv); | |
1917 | l_ptr->abort_limit = tol / (jiffies_to_msecs(l_ptr->cont_intv) / 4); | |
b97bf3fd PL |
1918 | } |
1919 | ||
a18c4bc3 | 1920 | void tipc_link_set_queue_limits(struct tipc_link *l_ptr, u32 window) |
b97bf3fd PL |
1921 | { |
1922 | /* Data messages from this node, inclusive FIRST_FRAGM */ | |
06d82c91 AS |
1923 | l_ptr->queue_limit[TIPC_LOW_IMPORTANCE] = window; |
1924 | l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE] = (window / 3) * 4; | |
1925 | l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE] = (window / 3) * 5; | |
1926 | l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE] = (window / 3) * 6; | |
b97bf3fd | 1927 | /* Transiting data messages,inclusive FIRST_FRAGM */ |
06d82c91 AS |
1928 | l_ptr->queue_limit[TIPC_LOW_IMPORTANCE + 4] = 300; |
1929 | l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE + 4] = 600; | |
1930 | l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE + 4] = 900; | |
1931 | l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE + 4] = 1200; | |
b97bf3fd | 1932 | l_ptr->queue_limit[CONN_MANAGER] = 1200; |
b97bf3fd PL |
1933 | l_ptr->queue_limit[CHANGEOVER_PROTOCOL] = 2500; |
1934 | l_ptr->queue_limit[NAME_DISTRIBUTOR] = 3000; | |
1935 | /* FRAGMENT and LAST_FRAGMENT packets */ | |
1936 | l_ptr->queue_limit[MSG_FRAGMENTER] = 4000; | |
1937 | } | |
1938 | ||
e099e86c | 1939 | /* tipc_link_find_owner - locate owner node of link by link's name |
f2f9800d | 1940 | * @net: the applicable net namespace |
e099e86c JPM |
1941 | * @name: pointer to link name string |
1942 | * @bearer_id: pointer to index in 'node->links' array where the link was found. | |
c4307285 | 1943 | * |
e099e86c | 1944 | * Returns pointer to node owning the link, or 0 if no matching link is found. |
b97bf3fd | 1945 | */ |
f2f9800d YX |
1946 | static struct tipc_node *tipc_link_find_owner(struct net *net, |
1947 | const char *link_name, | |
e099e86c | 1948 | unsigned int *bearer_id) |
b97bf3fd | 1949 | { |
f2f9800d | 1950 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
a18c4bc3 | 1951 | struct tipc_link *l_ptr; |
bbfbe47c | 1952 | struct tipc_node *n_ptr; |
886eaa1f | 1953 | struct tipc_node *found_node = NULL; |
bbfbe47c | 1954 | int i; |
b97bf3fd | 1955 | |
e099e86c | 1956 | *bearer_id = 0; |
6c7a762e | 1957 | rcu_read_lock(); |
f2f9800d | 1958 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
a11607f5 | 1959 | tipc_node_lock(n_ptr); |
bbfbe47c EH |
1960 | for (i = 0; i < MAX_BEARERS; i++) { |
1961 | l_ptr = n_ptr->links[i]; | |
e099e86c JPM |
1962 | if (l_ptr && !strcmp(l_ptr->name, link_name)) { |
1963 | *bearer_id = i; | |
1964 | found_node = n_ptr; | |
1965 | break; | |
1966 | } | |
bbfbe47c | 1967 | } |
a11607f5 | 1968 | tipc_node_unlock(n_ptr); |
e099e86c JPM |
1969 | if (found_node) |
1970 | break; | |
bbfbe47c | 1971 | } |
6c7a762e YX |
1972 | rcu_read_unlock(); |
1973 | ||
e099e86c | 1974 | return found_node; |
b97bf3fd PL |
1975 | } |
1976 | ||
5c216e1d AS |
1977 | /** |
1978 | * link_value_is_valid -- validate proposed link tolerance/priority/window | |
1979 | * | |
2c53040f BH |
1980 | * @cmd: value type (TIPC_CMD_SET_LINK_*) |
1981 | * @new_value: the new value | |
5c216e1d AS |
1982 | * |
1983 | * Returns 1 if value is within range, 0 if not. | |
1984 | */ | |
5c216e1d AS |
1985 | static int link_value_is_valid(u16 cmd, u32 new_value) |
1986 | { | |
1987 | switch (cmd) { | |
1988 | case TIPC_CMD_SET_LINK_TOL: | |
1989 | return (new_value >= TIPC_MIN_LINK_TOL) && | |
1990 | (new_value <= TIPC_MAX_LINK_TOL); | |
1991 | case TIPC_CMD_SET_LINK_PRI: | |
1992 | return (new_value <= TIPC_MAX_LINK_PRI); | |
1993 | case TIPC_CMD_SET_LINK_WINDOW: | |
1994 | return (new_value >= TIPC_MIN_LINK_WIN) && | |
1995 | (new_value <= TIPC_MAX_LINK_WIN); | |
1996 | } | |
1997 | return 0; | |
1998 | } | |
1999 | ||
5c216e1d AS |
2000 | /** |
2001 | * link_cmd_set_value - change priority/tolerance/window for link/bearer/media | |
f2f9800d | 2002 | * @net: the applicable net namespace |
2c53040f BH |
2003 | * @name: ptr to link, bearer, or media name |
2004 | * @new_value: new value of link, bearer, or media setting | |
2005 | * @cmd: which link, bearer, or media attribute to set (TIPC_CMD_SET_LINK_*) | |
5c216e1d | 2006 | * |
7216cd94 | 2007 | * Caller must hold RTNL lock to ensure link/bearer/media is not deleted. |
5c216e1d AS |
2008 | * |
2009 | * Returns 0 if value updated and negative value on error. | |
2010 | */ | |
f2f9800d YX |
2011 | static int link_cmd_set_value(struct net *net, const char *name, u32 new_value, |
2012 | u16 cmd) | |
5c216e1d AS |
2013 | { |
2014 | struct tipc_node *node; | |
a18c4bc3 | 2015 | struct tipc_link *l_ptr; |
5c216e1d | 2016 | struct tipc_bearer *b_ptr; |
358a0d1c | 2017 | struct tipc_media *m_ptr; |
e099e86c | 2018 | int bearer_id; |
636c0371 | 2019 | int res = 0; |
5c216e1d | 2020 | |
f2f9800d | 2021 | node = tipc_link_find_owner(net, name, &bearer_id); |
e099e86c | 2022 | if (node) { |
5c216e1d | 2023 | tipc_node_lock(node); |
e099e86c JPM |
2024 | l_ptr = node->links[bearer_id]; |
2025 | ||
2026 | if (l_ptr) { | |
2027 | switch (cmd) { | |
2028 | case TIPC_CMD_SET_LINK_TOL: | |
2029 | link_set_supervision_props(l_ptr, new_value); | |
247f0f3c YX |
2030 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, |
2031 | new_value, 0, 0); | |
e099e86c JPM |
2032 | break; |
2033 | case TIPC_CMD_SET_LINK_PRI: | |
2034 | l_ptr->priority = new_value; | |
247f0f3c YX |
2035 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, |
2036 | 0, new_value, 0); | |
e099e86c JPM |
2037 | break; |
2038 | case TIPC_CMD_SET_LINK_WINDOW: | |
2039 | tipc_link_set_queue_limits(l_ptr, new_value); | |
2040 | break; | |
2041 | default: | |
2042 | res = -EINVAL; | |
2043 | break; | |
2044 | } | |
5c216e1d AS |
2045 | } |
2046 | tipc_node_unlock(node); | |
636c0371 | 2047 | return res; |
5c216e1d AS |
2048 | } |
2049 | ||
7f9f95d9 | 2050 | b_ptr = tipc_bearer_find(net, name); |
5c216e1d AS |
2051 | if (b_ptr) { |
2052 | switch (cmd) { | |
2053 | case TIPC_CMD_SET_LINK_TOL: | |
2054 | b_ptr->tolerance = new_value; | |
636c0371 | 2055 | break; |
5c216e1d AS |
2056 | case TIPC_CMD_SET_LINK_PRI: |
2057 | b_ptr->priority = new_value; | |
636c0371 | 2058 | break; |
5c216e1d AS |
2059 | case TIPC_CMD_SET_LINK_WINDOW: |
2060 | b_ptr->window = new_value; | |
636c0371 YX |
2061 | break; |
2062 | default: | |
2063 | res = -EINVAL; | |
2064 | break; | |
5c216e1d | 2065 | } |
636c0371 | 2066 | return res; |
5c216e1d AS |
2067 | } |
2068 | ||
2069 | m_ptr = tipc_media_find(name); | |
2070 | if (!m_ptr) | |
2071 | return -ENODEV; | |
2072 | switch (cmd) { | |
2073 | case TIPC_CMD_SET_LINK_TOL: | |
2074 | m_ptr->tolerance = new_value; | |
636c0371 | 2075 | break; |
5c216e1d AS |
2076 | case TIPC_CMD_SET_LINK_PRI: |
2077 | m_ptr->priority = new_value; | |
636c0371 | 2078 | break; |
5c216e1d AS |
2079 | case TIPC_CMD_SET_LINK_WINDOW: |
2080 | m_ptr->window = new_value; | |
636c0371 YX |
2081 | break; |
2082 | default: | |
2083 | res = -EINVAL; | |
2084 | break; | |
5c216e1d | 2085 | } |
636c0371 | 2086 | return res; |
5c216e1d AS |
2087 | } |
2088 | ||
f2f9800d YX |
2089 | struct sk_buff *tipc_link_cmd_config(struct net *net, const void *req_tlv_area, |
2090 | int req_tlv_space, u16 cmd) | |
b97bf3fd PL |
2091 | { |
2092 | struct tipc_link_config *args; | |
c4307285 | 2093 | u32 new_value; |
c4307285 | 2094 | int res; |
b97bf3fd PL |
2095 | |
2096 | if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_CONFIG)) | |
4323add6 | 2097 | return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR); |
b97bf3fd PL |
2098 | |
2099 | args = (struct tipc_link_config *)TLV_DATA(req_tlv_area); | |
2100 | new_value = ntohl(args->value); | |
2101 | ||
5c216e1d AS |
2102 | if (!link_value_is_valid(cmd, new_value)) |
2103 | return tipc_cfg_reply_error_string( | |
2104 | "cannot change, value invalid"); | |
2105 | ||
4323add6 | 2106 | if (!strcmp(args->name, tipc_bclink_name)) { |
b97bf3fd | 2107 | if ((cmd == TIPC_CMD_SET_LINK_WINDOW) && |
4323add6 PL |
2108 | (tipc_bclink_set_queue_limits(new_value) == 0)) |
2109 | return tipc_cfg_reply_none(); | |
c4307285 | 2110 | return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED |
4323add6 | 2111 | " (cannot change setting on broadcast link)"); |
b97bf3fd PL |
2112 | } |
2113 | ||
f2f9800d | 2114 | res = link_cmd_set_value(net, args->name, new_value, cmd); |
b97bf3fd | 2115 | if (res) |
c4307285 | 2116 | return tipc_cfg_reply_error_string("cannot change link setting"); |
b97bf3fd | 2117 | |
4323add6 | 2118 | return tipc_cfg_reply_none(); |
b97bf3fd PL |
2119 | } |
2120 | ||
2121 | /** | |
2122 | * link_reset_statistics - reset link statistics | |
2123 | * @l_ptr: pointer to link | |
2124 | */ | |
a18c4bc3 | 2125 | static void link_reset_statistics(struct tipc_link *l_ptr) |
b97bf3fd PL |
2126 | { |
2127 | memset(&l_ptr->stats, 0, sizeof(l_ptr->stats)); | |
2128 | l_ptr->stats.sent_info = l_ptr->next_out_no; | |
2129 | l_ptr->stats.recv_info = l_ptr->next_in_no; | |
2130 | } | |
2131 | ||
f2f9800d YX |
2132 | struct sk_buff *tipc_link_cmd_reset_stats(struct net *net, |
2133 | const void *req_tlv_area, | |
2134 | int req_tlv_space) | |
b97bf3fd PL |
2135 | { |
2136 | char *link_name; | |
a18c4bc3 | 2137 | struct tipc_link *l_ptr; |
6c00055a | 2138 | struct tipc_node *node; |
e099e86c | 2139 | unsigned int bearer_id; |
b97bf3fd PL |
2140 | |
2141 | if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME)) | |
4323add6 | 2142 | return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR); |
b97bf3fd PL |
2143 | |
2144 | link_name = (char *)TLV_DATA(req_tlv_area); | |
4323add6 PL |
2145 | if (!strcmp(link_name, tipc_bclink_name)) { |
2146 | if (tipc_bclink_reset_stats()) | |
2147 | return tipc_cfg_reply_error_string("link not found"); | |
2148 | return tipc_cfg_reply_none(); | |
b97bf3fd | 2149 | } |
f2f9800d | 2150 | node = tipc_link_find_owner(net, link_name, &bearer_id); |
7216cd94 | 2151 | if (!node) |
e099e86c | 2152 | return tipc_cfg_reply_error_string("link not found"); |
7216cd94 | 2153 | |
a11607f5 | 2154 | tipc_node_lock(node); |
e099e86c | 2155 | l_ptr = node->links[bearer_id]; |
b97bf3fd | 2156 | if (!l_ptr) { |
e099e86c | 2157 | tipc_node_unlock(node); |
4323add6 | 2158 | return tipc_cfg_reply_error_string("link not found"); |
b97bf3fd | 2159 | } |
b97bf3fd | 2160 | link_reset_statistics(l_ptr); |
4323add6 | 2161 | tipc_node_unlock(node); |
4323add6 | 2162 | return tipc_cfg_reply_none(); |
b97bf3fd PL |
2163 | } |
2164 | ||
2165 | /** | |
2166 | * percent - convert count to a percentage of total (rounding up or down) | |
2167 | */ | |
b97bf3fd PL |
2168 | static u32 percent(u32 count, u32 total) |
2169 | { | |
2170 | return (count * 100 + (total / 2)) / total; | |
2171 | } | |
2172 | ||
2173 | /** | |
4323add6 | 2174 | * tipc_link_stats - print link statistics |
f2f9800d | 2175 | * @net: the applicable net namespace |
b97bf3fd PL |
2176 | * @name: link name |
2177 | * @buf: print buffer area | |
2178 | * @buf_size: size of print buffer area | |
c4307285 | 2179 | * |
b97bf3fd PL |
2180 | * Returns length of print buffer data string (or 0 if error) |
2181 | */ | |
f2f9800d YX |
2182 | static int tipc_link_stats(struct net *net, const char *name, char *buf, |
2183 | const u32 buf_size) | |
b97bf3fd | 2184 | { |
dc1aed37 EH |
2185 | struct tipc_link *l; |
2186 | struct tipc_stats *s; | |
6c00055a | 2187 | struct tipc_node *node; |
b97bf3fd PL |
2188 | char *status; |
2189 | u32 profile_total = 0; | |
e099e86c | 2190 | unsigned int bearer_id; |
dc1aed37 | 2191 | int ret; |
b97bf3fd | 2192 | |
4323add6 PL |
2193 | if (!strcmp(name, tipc_bclink_name)) |
2194 | return tipc_bclink_stats(buf, buf_size); | |
b97bf3fd | 2195 | |
f2f9800d | 2196 | node = tipc_link_find_owner(net, name, &bearer_id); |
7216cd94 | 2197 | if (!node) |
b97bf3fd | 2198 | return 0; |
7216cd94 | 2199 | |
4323add6 | 2200 | tipc_node_lock(node); |
e099e86c JPM |
2201 | |
2202 | l = node->links[bearer_id]; | |
2203 | if (!l) { | |
2204 | tipc_node_unlock(node); | |
e099e86c JPM |
2205 | return 0; |
2206 | } | |
2207 | ||
dc1aed37 | 2208 | s = &l->stats; |
b97bf3fd | 2209 | |
dc1aed37 | 2210 | if (tipc_link_is_active(l)) |
b97bf3fd | 2211 | status = "ACTIVE"; |
dc1aed37 | 2212 | else if (tipc_link_is_up(l)) |
b97bf3fd PL |
2213 | status = "STANDBY"; |
2214 | else | |
2215 | status = "DEFUNCT"; | |
dc1aed37 EH |
2216 | |
2217 | ret = tipc_snprintf(buf, buf_size, "Link <%s>\n" | |
2218 | " %s MTU:%u Priority:%u Tolerance:%u ms" | |
2219 | " Window:%u packets\n", | |
2220 | l->name, status, l->max_pkt, l->priority, | |
2221 | l->tolerance, l->queue_limit[0]); | |
2222 | ||
2223 | ret += tipc_snprintf(buf + ret, buf_size - ret, | |
2224 | " RX packets:%u fragments:%u/%u bundles:%u/%u\n", | |
2225 | l->next_in_no - s->recv_info, s->recv_fragments, | |
2226 | s->recv_fragmented, s->recv_bundles, | |
2227 | s->recv_bundled); | |
2228 | ||
2229 | ret += tipc_snprintf(buf + ret, buf_size - ret, | |
2230 | " TX packets:%u fragments:%u/%u bundles:%u/%u\n", | |
2231 | l->next_out_no - s->sent_info, s->sent_fragments, | |
2232 | s->sent_fragmented, s->sent_bundles, | |
2233 | s->sent_bundled); | |
2234 | ||
2235 | profile_total = s->msg_length_counts; | |
b97bf3fd PL |
2236 | if (!profile_total) |
2237 | profile_total = 1; | |
dc1aed37 EH |
2238 | |
2239 | ret += tipc_snprintf(buf + ret, buf_size - ret, | |
2240 | " TX profile sample:%u packets average:%u octets\n" | |
2241 | " 0-64:%u%% -256:%u%% -1024:%u%% -4096:%u%% " | |
2242 | "-16384:%u%% -32768:%u%% -66000:%u%%\n", | |
2243 | s->msg_length_counts, | |
2244 | s->msg_lengths_total / profile_total, | |
2245 | percent(s->msg_length_profile[0], profile_total), | |
2246 | percent(s->msg_length_profile[1], profile_total), | |
2247 | percent(s->msg_length_profile[2], profile_total), | |
2248 | percent(s->msg_length_profile[3], profile_total), | |
2249 | percent(s->msg_length_profile[4], profile_total), | |
2250 | percent(s->msg_length_profile[5], profile_total), | |
2251 | percent(s->msg_length_profile[6], profile_total)); | |
2252 | ||
2253 | ret += tipc_snprintf(buf + ret, buf_size - ret, | |
2254 | " RX states:%u probes:%u naks:%u defs:%u" | |
2255 | " dups:%u\n", s->recv_states, s->recv_probes, | |
2256 | s->recv_nacks, s->deferred_recv, s->duplicates); | |
2257 | ||
2258 | ret += tipc_snprintf(buf + ret, buf_size - ret, | |
2259 | " TX states:%u probes:%u naks:%u acks:%u" | |
2260 | " dups:%u\n", s->sent_states, s->sent_probes, | |
2261 | s->sent_nacks, s->sent_acks, s->retransmitted); | |
2262 | ||
2263 | ret += tipc_snprintf(buf + ret, buf_size - ret, | |
3c294cb3 YX |
2264 | " Congestion link:%u Send queue" |
2265 | " max:%u avg:%u\n", s->link_congs, | |
dc1aed37 EH |
2266 | s->max_queue_sz, s->queue_sz_counts ? |
2267 | (s->accu_queue_sz / s->queue_sz_counts) : 0); | |
b97bf3fd | 2268 | |
4323add6 | 2269 | tipc_node_unlock(node); |
dc1aed37 | 2270 | return ret; |
b97bf3fd PL |
2271 | } |
2272 | ||
f2f9800d YX |
2273 | struct sk_buff *tipc_link_cmd_show_stats(struct net *net, |
2274 | const void *req_tlv_area, | |
2275 | int req_tlv_space) | |
b97bf3fd PL |
2276 | { |
2277 | struct sk_buff *buf; | |
2278 | struct tlv_desc *rep_tlv; | |
2279 | int str_len; | |
dc1aed37 EH |
2280 | int pb_len; |
2281 | char *pb; | |
b97bf3fd PL |
2282 | |
2283 | if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME)) | |
4323add6 | 2284 | return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR); |
b97bf3fd | 2285 | |
dc1aed37 | 2286 | buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN)); |
b97bf3fd PL |
2287 | if (!buf) |
2288 | return NULL; | |
2289 | ||
2290 | rep_tlv = (struct tlv_desc *)buf->data; | |
dc1aed37 EH |
2291 | pb = TLV_DATA(rep_tlv); |
2292 | pb_len = ULTRA_STRING_MAX_LEN; | |
f2f9800d | 2293 | str_len = tipc_link_stats(net, (char *)TLV_DATA(req_tlv_area), |
dc1aed37 | 2294 | pb, pb_len); |
b97bf3fd | 2295 | if (!str_len) { |
5f6d9123 | 2296 | kfree_skb(buf); |
c4307285 | 2297 | return tipc_cfg_reply_error_string("link not found"); |
b97bf3fd | 2298 | } |
dc1aed37 | 2299 | str_len += 1; /* for "\0" */ |
b97bf3fd PL |
2300 | skb_put(buf, TLV_SPACE(str_len)); |
2301 | TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len); | |
2302 | ||
2303 | return buf; | |
2304 | } | |
2305 | ||
a18c4bc3 | 2306 | static void link_print(struct tipc_link *l_ptr, const char *str) |
b97bf3fd | 2307 | { |
7f9f95d9 | 2308 | struct tipc_net *tn = net_generic(l_ptr->owner->net, tipc_net_id); |
7a2f7d18 YX |
2309 | struct tipc_bearer *b_ptr; |
2310 | ||
2311 | rcu_read_lock(); | |
7f9f95d9 | 2312 | b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]); |
7a2f7d18 YX |
2313 | if (b_ptr) |
2314 | pr_info("%s Link %x<%s>:", str, l_ptr->addr, b_ptr->name); | |
2315 | rcu_read_unlock(); | |
8d64a5ba | 2316 | |
b97bf3fd | 2317 | if (link_working_unknown(l_ptr)) |
5deedde9 | 2318 | pr_cont(":WU\n"); |
8d64a5ba | 2319 | else if (link_reset_reset(l_ptr)) |
5deedde9 | 2320 | pr_cont(":RR\n"); |
8d64a5ba | 2321 | else if (link_reset_unknown(l_ptr)) |
5deedde9 | 2322 | pr_cont(":RU\n"); |
8d64a5ba | 2323 | else if (link_working_working(l_ptr)) |
5deedde9 PG |
2324 | pr_cont(":WW\n"); |
2325 | else | |
2326 | pr_cont("\n"); | |
b97bf3fd | 2327 | } |
0655f6a8 RA |
2328 | |
2329 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
2330 | */ | |
2331 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
2332 | { | |
2333 | int err; | |
2334 | ||
2335 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
2336 | tipc_nl_prop_policy); | |
2337 | if (err) | |
2338 | return err; | |
2339 | ||
2340 | if (props[TIPC_NLA_PROP_PRIO]) { | |
2341 | u32 prio; | |
2342 | ||
2343 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
2344 | if (prio > TIPC_MAX_LINK_PRI) | |
2345 | return -EINVAL; | |
2346 | } | |
2347 | ||
2348 | if (props[TIPC_NLA_PROP_TOL]) { | |
2349 | u32 tol; | |
2350 | ||
2351 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
2352 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
2353 | return -EINVAL; | |
2354 | } | |
2355 | ||
2356 | if (props[TIPC_NLA_PROP_WIN]) { | |
2357 | u32 win; | |
2358 | ||
2359 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
2360 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
2361 | return -EINVAL; | |
2362 | } | |
2363 | ||
2364 | return 0; | |
2365 | } | |
7be57fc6 | 2366 | |
f96ce7a2 RA |
2367 | int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info) |
2368 | { | |
2369 | int err; | |
2370 | int res = 0; | |
2371 | int bearer_id; | |
2372 | char *name; | |
2373 | struct tipc_link *link; | |
2374 | struct tipc_node *node; | |
2375 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
f2f9800d | 2376 | struct net *net = genl_info_net(info); |
f96ce7a2 RA |
2377 | |
2378 | if (!info->attrs[TIPC_NLA_LINK]) | |
2379 | return -EINVAL; | |
2380 | ||
2381 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
2382 | info->attrs[TIPC_NLA_LINK], | |
2383 | tipc_nl_link_policy); | |
2384 | if (err) | |
2385 | return err; | |
2386 | ||
2387 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
2388 | return -EINVAL; | |
2389 | ||
2390 | name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
2391 | ||
f2f9800d | 2392 | node = tipc_link_find_owner(net, name, &bearer_id); |
f96ce7a2 RA |
2393 | if (!node) |
2394 | return -EINVAL; | |
2395 | ||
2396 | tipc_node_lock(node); | |
2397 | ||
2398 | link = node->links[bearer_id]; | |
2399 | if (!link) { | |
2400 | res = -EINVAL; | |
2401 | goto out; | |
2402 | } | |
2403 | ||
2404 | if (attrs[TIPC_NLA_LINK_PROP]) { | |
2405 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; | |
2406 | ||
2407 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], | |
2408 | props); | |
2409 | if (err) { | |
2410 | res = err; | |
2411 | goto out; | |
2412 | } | |
2413 | ||
2414 | if (props[TIPC_NLA_PROP_TOL]) { | |
2415 | u32 tol; | |
2416 | ||
2417 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
2418 | link_set_supervision_props(link, tol); | |
2419 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0, 0); | |
2420 | } | |
2421 | if (props[TIPC_NLA_PROP_PRIO]) { | |
2422 | u32 prio; | |
2423 | ||
2424 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
2425 | link->priority = prio; | |
2426 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio, 0); | |
2427 | } | |
2428 | if (props[TIPC_NLA_PROP_WIN]) { | |
2429 | u32 win; | |
2430 | ||
2431 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
2432 | tipc_link_set_queue_limits(link, win); | |
2433 | } | |
2434 | } | |
2435 | ||
2436 | out: | |
2437 | tipc_node_unlock(node); | |
2438 | ||
2439 | return res; | |
2440 | } | |
d8182804 RA |
2441 | |
2442 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) | |
7be57fc6 RA |
2443 | { |
2444 | int i; | |
2445 | struct nlattr *stats; | |
2446 | ||
2447 | struct nla_map { | |
2448 | u32 key; | |
2449 | u32 val; | |
2450 | }; | |
2451 | ||
2452 | struct nla_map map[] = { | |
2453 | {TIPC_NLA_STATS_RX_INFO, s->recv_info}, | |
2454 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, | |
2455 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
2456 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
2457 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
2458 | {TIPC_NLA_STATS_TX_INFO, s->sent_info}, | |
2459 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, | |
2460 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
2461 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
2462 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
2463 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
2464 | s->msg_length_counts : 1}, | |
2465 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
2466 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
2467 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
2468 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
2469 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
2470 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
2471 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
2472 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
2473 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
2474 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
2475 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
2476 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
2477 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
2478 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
2479 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
2480 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
2481 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
2482 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
2483 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
2484 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
2485 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
2486 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
2487 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
2488 | }; | |
2489 | ||
2490 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
2491 | if (!stats) | |
2492 | return -EMSGSIZE; | |
2493 | ||
2494 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
2495 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
2496 | goto msg_full; | |
2497 | ||
2498 | nla_nest_end(skb, stats); | |
2499 | ||
2500 | return 0; | |
2501 | msg_full: | |
2502 | nla_nest_cancel(skb, stats); | |
2503 | ||
2504 | return -EMSGSIZE; | |
2505 | } | |
2506 | ||
2507 | /* Caller should hold appropriate locks to protect the link */ | |
d8182804 | 2508 | static int __tipc_nl_add_link(struct tipc_nl_msg *msg, struct tipc_link *link) |
7be57fc6 RA |
2509 | { |
2510 | int err; | |
2511 | void *hdr; | |
2512 | struct nlattr *attrs; | |
2513 | struct nlattr *prop; | |
2514 | ||
2515 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_v2_family, | |
2516 | NLM_F_MULTI, TIPC_NL_LINK_GET); | |
2517 | if (!hdr) | |
2518 | return -EMSGSIZE; | |
2519 | ||
2520 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
2521 | if (!attrs) | |
2522 | goto msg_full; | |
2523 | ||
2524 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
2525 | goto attr_msg_full; | |
2526 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, | |
2527 | tipc_cluster_mask(tipc_own_addr))) | |
2528 | goto attr_msg_full; | |
2529 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->max_pkt)) | |
2530 | goto attr_msg_full; | |
2531 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->next_in_no)) | |
2532 | goto attr_msg_full; | |
2533 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->next_out_no)) | |
2534 | goto attr_msg_full; | |
2535 | ||
2536 | if (tipc_link_is_up(link)) | |
2537 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2538 | goto attr_msg_full; | |
2539 | if (tipc_link_is_active(link)) | |
2540 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) | |
2541 | goto attr_msg_full; | |
2542 | ||
2543 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
2544 | if (!prop) | |
2545 | goto attr_msg_full; | |
2546 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2547 | goto prop_msg_full; | |
2548 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
2549 | goto prop_msg_full; | |
2550 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
2551 | link->queue_limit[TIPC_LOW_IMPORTANCE])) | |
2552 | goto prop_msg_full; | |
2553 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2554 | goto prop_msg_full; | |
2555 | nla_nest_end(msg->skb, prop); | |
2556 | ||
2557 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
2558 | if (err) | |
2559 | goto attr_msg_full; | |
2560 | ||
2561 | nla_nest_end(msg->skb, attrs); | |
2562 | genlmsg_end(msg->skb, hdr); | |
2563 | ||
2564 | return 0; | |
2565 | ||
2566 | prop_msg_full: | |
2567 | nla_nest_cancel(msg->skb, prop); | |
2568 | attr_msg_full: | |
2569 | nla_nest_cancel(msg->skb, attrs); | |
2570 | msg_full: | |
2571 | genlmsg_cancel(msg->skb, hdr); | |
2572 | ||
2573 | return -EMSGSIZE; | |
2574 | } | |
2575 | ||
2576 | /* Caller should hold node lock */ | |
d8182804 RA |
2577 | static int __tipc_nl_add_node_links(struct tipc_nl_msg *msg, |
2578 | struct tipc_node *node, | |
2579 | u32 *prev_link) | |
7be57fc6 RA |
2580 | { |
2581 | u32 i; | |
2582 | int err; | |
2583 | ||
2584 | for (i = *prev_link; i < MAX_BEARERS; i++) { | |
2585 | *prev_link = i; | |
2586 | ||
2587 | if (!node->links[i]) | |
2588 | continue; | |
2589 | ||
2590 | err = __tipc_nl_add_link(msg, node->links[i]); | |
2591 | if (err) | |
2592 | return err; | |
2593 | } | |
2594 | *prev_link = 0; | |
2595 | ||
2596 | return 0; | |
2597 | } | |
2598 | ||
2599 | int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2600 | { | |
f2f9800d YX |
2601 | struct net *net = sock_net(skb->sk); |
2602 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
7be57fc6 RA |
2603 | struct tipc_node *node; |
2604 | struct tipc_nl_msg msg; | |
2605 | u32 prev_node = cb->args[0]; | |
2606 | u32 prev_link = cb->args[1]; | |
2607 | int done = cb->args[2]; | |
2608 | int err; | |
2609 | ||
2610 | if (done) | |
2611 | return 0; | |
2612 | ||
2613 | msg.skb = skb; | |
2614 | msg.portid = NETLINK_CB(cb->skb).portid; | |
2615 | msg.seq = cb->nlh->nlmsg_seq; | |
2616 | ||
2617 | rcu_read_lock(); | |
2618 | ||
2619 | if (prev_node) { | |
f2f9800d | 2620 | node = tipc_node_find(net, prev_node); |
7be57fc6 RA |
2621 | if (!node) { |
2622 | /* We never set seq or call nl_dump_check_consistent() | |
2623 | * this means that setting prev_seq here will cause the | |
2624 | * consistence check to fail in the netlink callback | |
2625 | * handler. Resulting in the last NLMSG_DONE message | |
2626 | * having the NLM_F_DUMP_INTR flag set. | |
2627 | */ | |
2628 | cb->prev_seq = 1; | |
2629 | goto out; | |
2630 | } | |
2631 | ||
f2f9800d YX |
2632 | list_for_each_entry_continue_rcu(node, &tn->node_list, |
2633 | list) { | |
7be57fc6 RA |
2634 | tipc_node_lock(node); |
2635 | err = __tipc_nl_add_node_links(&msg, node, &prev_link); | |
2636 | tipc_node_unlock(node); | |
2637 | if (err) | |
2638 | goto out; | |
2639 | ||
2640 | prev_node = node->addr; | |
2641 | } | |
2642 | } else { | |
2643 | err = tipc_nl_add_bc_link(&msg); | |
2644 | if (err) | |
2645 | goto out; | |
2646 | ||
f2f9800d | 2647 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
7be57fc6 RA |
2648 | tipc_node_lock(node); |
2649 | err = __tipc_nl_add_node_links(&msg, node, &prev_link); | |
2650 | tipc_node_unlock(node); | |
2651 | if (err) | |
2652 | goto out; | |
2653 | ||
2654 | prev_node = node->addr; | |
2655 | } | |
2656 | } | |
2657 | done = 1; | |
2658 | out: | |
2659 | rcu_read_unlock(); | |
2660 | ||
2661 | cb->args[0] = prev_node; | |
2662 | cb->args[1] = prev_link; | |
2663 | cb->args[2] = done; | |
2664 | ||
2665 | return skb->len; | |
2666 | } | |
2667 | ||
2668 | int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info) | |
2669 | { | |
f2f9800d | 2670 | struct net *net = genl_info_net(info); |
7be57fc6 RA |
2671 | struct sk_buff *ans_skb; |
2672 | struct tipc_nl_msg msg; | |
2673 | struct tipc_link *link; | |
2674 | struct tipc_node *node; | |
2675 | char *name; | |
2676 | int bearer_id; | |
2677 | int err; | |
2678 | ||
2679 | if (!info->attrs[TIPC_NLA_LINK_NAME]) | |
2680 | return -EINVAL; | |
2681 | ||
2682 | name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]); | |
f2f9800d | 2683 | node = tipc_link_find_owner(net, name, &bearer_id); |
7be57fc6 RA |
2684 | if (!node) |
2685 | return -EINVAL; | |
2686 | ||
2687 | ans_skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
2688 | if (!ans_skb) | |
2689 | return -ENOMEM; | |
2690 | ||
2691 | msg.skb = ans_skb; | |
2692 | msg.portid = info->snd_portid; | |
2693 | msg.seq = info->snd_seq; | |
2694 | ||
2695 | tipc_node_lock(node); | |
2696 | link = node->links[bearer_id]; | |
2697 | if (!link) { | |
2698 | err = -EINVAL; | |
2699 | goto err_out; | |
2700 | } | |
2701 | ||
2702 | err = __tipc_nl_add_link(&msg, link); | |
2703 | if (err) | |
2704 | goto err_out; | |
2705 | ||
2706 | tipc_node_unlock(node); | |
2707 | ||
2708 | return genlmsg_reply(ans_skb, info); | |
2709 | ||
2710 | err_out: | |
2711 | tipc_node_unlock(node); | |
2712 | nlmsg_free(ans_skb); | |
2713 | ||
2714 | return err; | |
2715 | } | |
ae36342b RA |
2716 | |
2717 | int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info) | |
2718 | { | |
2719 | int err; | |
2720 | char *link_name; | |
2721 | unsigned int bearer_id; | |
2722 | struct tipc_link *link; | |
2723 | struct tipc_node *node; | |
2724 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
f2f9800d | 2725 | struct net *net = genl_info_net(info); |
ae36342b RA |
2726 | |
2727 | if (!info->attrs[TIPC_NLA_LINK]) | |
2728 | return -EINVAL; | |
2729 | ||
2730 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
2731 | info->attrs[TIPC_NLA_LINK], | |
2732 | tipc_nl_link_policy); | |
2733 | if (err) | |
2734 | return err; | |
2735 | ||
2736 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
2737 | return -EINVAL; | |
2738 | ||
2739 | link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
2740 | ||
2741 | if (strcmp(link_name, tipc_bclink_name) == 0) { | |
2742 | err = tipc_bclink_reset_stats(); | |
2743 | if (err) | |
2744 | return err; | |
2745 | return 0; | |
2746 | } | |
2747 | ||
f2f9800d | 2748 | node = tipc_link_find_owner(net, link_name, &bearer_id); |
ae36342b RA |
2749 | if (!node) |
2750 | return -EINVAL; | |
2751 | ||
2752 | tipc_node_lock(node); | |
2753 | ||
2754 | link = node->links[bearer_id]; | |
2755 | if (!link) { | |
2756 | tipc_node_unlock(node); | |
2757 | return -EINVAL; | |
2758 | } | |
2759 | ||
2760 | link_reset_statistics(link); | |
2761 | ||
2762 | tipc_node_unlock(node); | |
2763 | ||
2764 | return 0; | |
2765 | } |