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Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/link.c: TIPC link code | |
c4307285 | 3 | * |
c1336ee4 | 4 | * Copyright (c) 1996-2007, 2012-2015, 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" | |
e3eea1eb | 38 | #include "subscr.h" |
b97bf3fd | 39 | #include "link.h" |
7be57fc6 | 40 | #include "bcast.h" |
9816f061 | 41 | #include "socket.h" |
b97bf3fd | 42 | #include "name_distr.h" |
b97bf3fd | 43 | #include "discover.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 ??? */ | |
cd4eee3c | 89 | #define SILENCE_EVT 560817u /* timer dicovered silence from peer */ |
b97bf3fd | 90 | |
c4307285 | 91 | /* |
dff29b1a | 92 | * State value stored in 'failover_pkts' |
b97bf3fd | 93 | */ |
dff29b1a | 94 | #define FIRST_FAILOVER 0xffffu |
b97bf3fd | 95 | |
c5898636 JPM |
96 | static void link_handle_out_of_seq_msg(struct tipc_link *link, |
97 | struct sk_buff *skb); | |
98 | static void tipc_link_proto_rcv(struct tipc_link *link, | |
99 | struct sk_buff *skb); | |
2f55c437 | 100 | static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol); |
a18c4bc3 PG |
101 | static void link_state_event(struct tipc_link *l_ptr, u32 event); |
102 | static void link_reset_statistics(struct tipc_link *l_ptr); | |
103 | static void link_print(struct tipc_link *l_ptr, const char *str); | |
247f0f3c YX |
104 | static void tipc_link_sync_xmit(struct tipc_link *l); |
105 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf); | |
c637c103 JPM |
106 | static void tipc_link_input(struct tipc_link *l, struct sk_buff *skb); |
107 | static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb); | |
dff29b1a | 108 | static bool tipc_link_failover_rcv(struct tipc_link *l, struct sk_buff **skb); |
cd4eee3c | 109 | static void link_set_timer(struct tipc_link *link, unsigned long time); |
b97bf3fd | 110 | /* |
05790c64 | 111 | * Simple link routines |
b97bf3fd | 112 | */ |
05790c64 | 113 | static unsigned int align(unsigned int i) |
b97bf3fd PL |
114 | { |
115 | return (i + 3) & ~3u; | |
116 | } | |
117 | ||
2d72d495 JPM |
118 | static void tipc_link_release(struct kref *kref) |
119 | { | |
120 | kfree(container_of(kref, struct tipc_link, ref)); | |
121 | } | |
122 | ||
123 | static void tipc_link_get(struct tipc_link *l_ptr) | |
124 | { | |
125 | kref_get(&l_ptr->ref); | |
126 | } | |
127 | ||
128 | static void tipc_link_put(struct tipc_link *l_ptr) | |
129 | { | |
130 | kref_put(&l_ptr->ref, tipc_link_release); | |
131 | } | |
132 | ||
8b4ed863 JPM |
133 | static struct tipc_link *tipc_parallel_link(struct tipc_link *l) |
134 | { | |
9d13ec65 JPM |
135 | struct tipc_node *n = l->owner; |
136 | ||
137 | if (node_active_link(n, 0) != l) | |
138 | return node_active_link(n, 0); | |
139 | return node_active_link(n, 1); | |
8b4ed863 JPM |
140 | } |
141 | ||
b97bf3fd | 142 | /* |
05790c64 | 143 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 144 | */ |
a18c4bc3 | 145 | int tipc_link_is_up(struct tipc_link *l_ptr) |
b97bf3fd PL |
146 | { |
147 | if (!l_ptr) | |
148 | return 0; | |
a02cec21 | 149 | return link_working_working(l_ptr) || link_working_unknown(l_ptr); |
b97bf3fd PL |
150 | } |
151 | ||
9d13ec65 | 152 | int tipc_link_is_active(struct tipc_link *l) |
b97bf3fd | 153 | { |
9d13ec65 JPM |
154 | struct tipc_node *n = l->owner; |
155 | ||
156 | return (node_active_link(n, 0) == l) || (node_active_link(n, 1) == l); | |
b97bf3fd PL |
157 | } |
158 | ||
b97bf3fd PL |
159 | /** |
160 | * link_timeout - handle expiration of link timer | |
161 | * @l_ptr: pointer to link | |
b97bf3fd | 162 | */ |
2f55c437 | 163 | static void link_timeout(unsigned long data) |
b97bf3fd | 164 | { |
2f55c437 | 165 | struct tipc_link *l_ptr = (struct tipc_link *)data; |
58dc55f2 YX |
166 | struct sk_buff *skb; |
167 | ||
4323add6 | 168 | tipc_node_lock(l_ptr->owner); |
b97bf3fd PL |
169 | |
170 | /* update counters used in statistical profiling of send traffic */ | |
05dcc5aa | 171 | l_ptr->stats.accu_queue_sz += skb_queue_len(&l_ptr->transmq); |
b97bf3fd PL |
172 | l_ptr->stats.queue_sz_counts++; |
173 | ||
05dcc5aa | 174 | skb = skb_peek(&l_ptr->transmq); |
58dc55f2 YX |
175 | if (skb) { |
176 | struct tipc_msg *msg = buf_msg(skb); | |
b97bf3fd PL |
177 | u32 length = msg_size(msg); |
178 | ||
f64f9e71 JP |
179 | if ((msg_user(msg) == MSG_FRAGMENTER) && |
180 | (msg_type(msg) == FIRST_FRAGMENT)) { | |
b97bf3fd PL |
181 | length = msg_size(msg_get_wrapped(msg)); |
182 | } | |
183 | if (length) { | |
184 | l_ptr->stats.msg_lengths_total += length; | |
185 | l_ptr->stats.msg_length_counts++; | |
186 | if (length <= 64) | |
187 | l_ptr->stats.msg_length_profile[0]++; | |
188 | else if (length <= 256) | |
189 | l_ptr->stats.msg_length_profile[1]++; | |
190 | else if (length <= 1024) | |
191 | l_ptr->stats.msg_length_profile[2]++; | |
192 | else if (length <= 4096) | |
193 | l_ptr->stats.msg_length_profile[3]++; | |
194 | else if (length <= 16384) | |
195 | l_ptr->stats.msg_length_profile[4]++; | |
196 | else if (length <= 32768) | |
197 | l_ptr->stats.msg_length_profile[5]++; | |
198 | else | |
199 | l_ptr->stats.msg_length_profile[6]++; | |
200 | } | |
201 | } | |
202 | ||
203 | /* do all other link processing performed on a periodic basis */ | |
cd4eee3c JPM |
204 | if (l_ptr->silent_intv_cnt || tipc_bclink_acks_missing(l_ptr->owner)) |
205 | link_state_event(l_ptr, SILENCE_EVT); | |
206 | l_ptr->silent_intv_cnt++; | |
05dcc5aa | 207 | if (skb_queue_len(&l_ptr->backlogq)) |
47b4c9a8 | 208 | tipc_link_push_packets(l_ptr); |
cd4eee3c | 209 | link_set_timer(l_ptr, l_ptr->keepalive_intv); |
4323add6 | 210 | tipc_node_unlock(l_ptr->owner); |
2d72d495 | 211 | tipc_link_put(l_ptr); |
b97bf3fd PL |
212 | } |
213 | ||
2f55c437 | 214 | static void link_set_timer(struct tipc_link *link, unsigned long time) |
b97bf3fd | 215 | { |
2d72d495 JPM |
216 | if (!mod_timer(&link->timer, jiffies + time)) |
217 | tipc_link_get(link); | |
b97bf3fd PL |
218 | } |
219 | ||
220 | /** | |
4323add6 | 221 | * tipc_link_create - create a new link |
37b9c08a | 222 | * @n_ptr: pointer to associated node |
b97bf3fd | 223 | * @b_ptr: pointer to associated bearer |
b97bf3fd | 224 | * @media_addr: media address to use when sending messages over link |
c4307285 | 225 | * |
b97bf3fd PL |
226 | * Returns pointer to link. |
227 | */ | |
a18c4bc3 | 228 | struct tipc_link *tipc_link_create(struct tipc_node *n_ptr, |
c61dd61d | 229 | struct tipc_bearer *b_ptr, |
d39bbd44 JPM |
230 | const struct tipc_media_addr *media_addr, |
231 | struct sk_buff_head *inputq, | |
232 | struct sk_buff_head *namedq) | |
b97bf3fd | 233 | { |
34747539 | 234 | struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id); |
a18c4bc3 | 235 | struct tipc_link *l_ptr; |
b97bf3fd PL |
236 | struct tipc_msg *msg; |
237 | char *if_name; | |
37b9c08a AS |
238 | char addr_string[16]; |
239 | u32 peer = n_ptr->addr; | |
240 | ||
0372bf5c | 241 | if (n_ptr->link_cnt >= MAX_BEARERS) { |
37b9c08a | 242 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
a97b9d3f JPM |
243 | pr_err("Cannot establish %uth link to %s. Max %u allowed.\n", |
244 | n_ptr->link_cnt, addr_string, MAX_BEARERS); | |
37b9c08a AS |
245 | return NULL; |
246 | } | |
247 | ||
9d13ec65 | 248 | if (n_ptr->links[b_ptr->identity].link) { |
37b9c08a | 249 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
2cf8aa19 EH |
250 | pr_err("Attempt to establish second link on <%s> to %s\n", |
251 | b_ptr->name, addr_string); | |
37b9c08a AS |
252 | return NULL; |
253 | } | |
b97bf3fd | 254 | |
0da974f4 | 255 | l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC); |
b97bf3fd | 256 | if (!l_ptr) { |
2cf8aa19 | 257 | pr_warn("Link creation failed, no memory\n"); |
b97bf3fd PL |
258 | return NULL; |
259 | } | |
2d72d495 | 260 | kref_init(&l_ptr->ref); |
b97bf3fd | 261 | l_ptr->addr = peer; |
2d627b92 | 262 | if_name = strchr(b_ptr->name, ':') + 1; |
062b4c99 | 263 | sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:unknown", |
34747539 YX |
264 | tipc_zone(tn->own_addr), tipc_cluster(tn->own_addr), |
265 | tipc_node(tn->own_addr), | |
b97bf3fd PL |
266 | if_name, |
267 | tipc_zone(peer), tipc_cluster(peer), tipc_node(peer)); | |
062b4c99 | 268 | /* note: peer i/f name is updated by reset/activate message */ |
b97bf3fd | 269 | memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr)); |
37b9c08a | 270 | l_ptr->owner = n_ptr; |
f882cb76 | 271 | l_ptr->peer_session = INVALID_SESSION; |
7a2f7d18 | 272 | l_ptr->bearer_id = b_ptr->identity; |
5c216e1d | 273 | link_set_supervision_props(l_ptr, b_ptr->tolerance); |
b97bf3fd PL |
274 | l_ptr->state = RESET_UNKNOWN; |
275 | ||
276 | l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg; | |
277 | msg = l_ptr->pmsg; | |
c5898636 | 278 | tipc_msg_init(tn->own_addr, msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, |
34747539 | 279 | l_ptr->addr); |
b97bf3fd | 280 | msg_set_size(msg, sizeof(l_ptr->proto_msg)); |
bafa29e3 | 281 | msg_set_session(msg, (tn->random & 0xffff)); |
b97bf3fd PL |
282 | msg_set_bearer_id(msg, b_ptr->identity); |
283 | strcpy((char *)msg_data(msg), if_name); | |
7a2f7d18 | 284 | l_ptr->net_plane = b_ptr->net_plane; |
ed193ece JPM |
285 | l_ptr->advertised_mtu = b_ptr->mtu; |
286 | l_ptr->mtu = l_ptr->advertised_mtu; | |
e3eea1eb JPM |
287 | l_ptr->priority = b_ptr->priority; |
288 | tipc_link_set_queue_limits(l_ptr, b_ptr->window); | |
a97b9d3f | 289 | l_ptr->snd_nxt = 1; |
05dcc5aa JPM |
290 | __skb_queue_head_init(&l_ptr->transmq); |
291 | __skb_queue_head_init(&l_ptr->backlogq); | |
292 | __skb_queue_head_init(&l_ptr->deferdq); | |
c637c103 | 293 | skb_queue_head_init(&l_ptr->wakeupq); |
d39bbd44 JPM |
294 | l_ptr->inputq = inputq; |
295 | l_ptr->namedq = namedq; | |
296 | skb_queue_head_init(l_ptr->inputq); | |
b97bf3fd | 297 | link_reset_statistics(l_ptr); |
37b9c08a | 298 | tipc_node_attach_link(n_ptr, l_ptr); |
2f55c437 | 299 | setup_timer(&l_ptr->timer, link_timeout, (unsigned long)l_ptr); |
581465fa | 300 | link_state_event(l_ptr, STARTING_EVT); |
b97bf3fd | 301 | |
b97bf3fd PL |
302 | return l_ptr; |
303 | } | |
304 | ||
2d72d495 | 305 | /** |
dff29b1a JPM |
306 | * tipc_link_delete - Delete a link |
307 | * @l: link to be deleted | |
2d72d495 | 308 | */ |
dff29b1a | 309 | void tipc_link_delete(struct tipc_link *l) |
2d72d495 | 310 | { |
dff29b1a JPM |
311 | tipc_link_reset(l); |
312 | if (del_timer(&l->timer)) | |
313 | tipc_link_put(l); | |
314 | l->flags |= LINK_STOPPED; | |
315 | /* Delete link now, or when timer is finished: */ | |
316 | tipc_link_reset_fragments(l); | |
317 | tipc_node_detach_link(l->owner, l); | |
318 | tipc_link_put(l); | |
2d72d495 JPM |
319 | } |
320 | ||
b1c29f6b | 321 | void tipc_link_delete_list(struct net *net, unsigned int bearer_id) |
8d8439b6 | 322 | { |
f2f9800d | 323 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
2d72d495 JPM |
324 | struct tipc_link *link; |
325 | struct tipc_node *node; | |
8d8439b6 | 326 | |
6c7a762e | 327 | rcu_read_lock(); |
2d72d495 JPM |
328 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
329 | tipc_node_lock(node); | |
9d13ec65 | 330 | link = node->links[bearer_id].link; |
dff29b1a | 331 | if (link) |
2d72d495 JPM |
332 | tipc_link_delete(link); |
333 | tipc_node_unlock(node); | |
8d8439b6 | 334 | } |
6c7a762e | 335 | rcu_read_unlock(); |
8d8439b6 | 336 | } |
b97bf3fd PL |
337 | |
338 | /** | |
3127a020 | 339 | * link_schedule_user - schedule a message sender for wakeup after congestion |
50100a5e | 340 | * @link: congested link |
3127a020 | 341 | * @list: message that was attempted sent |
50100a5e | 342 | * Create pseudo msg to send back to user when congestion abates |
3127a020 | 343 | * Only consumes message if there is an error |
b97bf3fd | 344 | */ |
3127a020 | 345 | static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list) |
b97bf3fd | 346 | { |
3127a020 JPM |
347 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
348 | int imp = msg_importance(msg); | |
349 | u32 oport = msg_origport(msg); | |
350 | u32 addr = link_own_addr(link); | |
351 | struct sk_buff *skb; | |
352 | ||
353 | /* This really cannot happen... */ | |
354 | if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) { | |
355 | pr_warn("%s<%s>, send queue full", link_rst_msg, link->name); | |
356 | tipc_link_reset(link); | |
357 | goto err; | |
358 | } | |
359 | /* Non-blocking sender: */ | |
360 | if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending) | |
361 | return -ELINKCONG; | |
362 | ||
363 | /* Create and schedule wakeup pseudo message */ | |
364 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, | |
365 | addr, addr, oport, 0, 0); | |
366 | if (!skb) | |
367 | goto err; | |
368 | TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list); | |
369 | TIPC_SKB_CB(skb)->chain_imp = imp; | |
370 | skb_queue_tail(&link->wakeupq, skb); | |
50100a5e | 371 | link->stats.link_congs++; |
3127a020 JPM |
372 | return -ELINKCONG; |
373 | err: | |
374 | __skb_queue_purge(list); | |
375 | return -ENOBUFS; | |
b97bf3fd PL |
376 | } |
377 | ||
50100a5e JPM |
378 | /** |
379 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
380 | * @link: congested link | |
381 | * Move a number of waiting users, as permitted by available space in | |
382 | * the send queue, from link wait queue to node wait queue for wakeup | |
383 | */ | |
1f66d161 | 384 | void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 385 | { |
1f66d161 JPM |
386 | int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,}; |
387 | int imp, lim; | |
58d78b32 | 388 | struct sk_buff *skb, *tmp; |
50100a5e | 389 | |
1f66d161 JPM |
390 | skb_queue_walk_safe(&l->wakeupq, skb, tmp) { |
391 | imp = TIPC_SKB_CB(skb)->chain_imp; | |
392 | lim = l->window + l->backlog[imp].limit; | |
393 | pnd[imp] += TIPC_SKB_CB(skb)->chain_sz; | |
394 | if ((pnd[imp] + l->backlog[imp].len) >= lim) | |
b97bf3fd | 395 | break; |
1f66d161 | 396 | skb_unlink(skb, &l->wakeupq); |
d39bbd44 JPM |
397 | skb_queue_tail(l->inputq, skb); |
398 | l->owner->inputq = l->inputq; | |
1f66d161 | 399 | l->owner->action_flags |= TIPC_MSG_EVT; |
b97bf3fd | 400 | } |
b97bf3fd PL |
401 | } |
402 | ||
b97bf3fd | 403 | /** |
4323add6 | 404 | * tipc_link_reset_fragments - purge link's inbound message fragments queue |
b97bf3fd PL |
405 | * @l_ptr: pointer to link |
406 | */ | |
a18c4bc3 | 407 | void tipc_link_reset_fragments(struct tipc_link *l_ptr) |
b97bf3fd | 408 | { |
37e22164 JPM |
409 | kfree_skb(l_ptr->reasm_buf); |
410 | l_ptr->reasm_buf = NULL; | |
b97bf3fd PL |
411 | } |
412 | ||
7d967b67 | 413 | void tipc_link_purge_backlog(struct tipc_link *l) |
1f66d161 JPM |
414 | { |
415 | __skb_queue_purge(&l->backlogq); | |
416 | l->backlog[TIPC_LOW_IMPORTANCE].len = 0; | |
417 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0; | |
418 | l->backlog[TIPC_HIGH_IMPORTANCE].len = 0; | |
419 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0; | |
420 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0; | |
421 | } | |
422 | ||
c4307285 | 423 | /** |
581465fa | 424 | * tipc_link_purge_queues - purge all pkt queues associated with link |
b97bf3fd PL |
425 | * @l_ptr: pointer to link |
426 | */ | |
581465fa | 427 | void tipc_link_purge_queues(struct tipc_link *l_ptr) |
b97bf3fd | 428 | { |
05dcc5aa JPM |
429 | __skb_queue_purge(&l_ptr->deferdq); |
430 | __skb_queue_purge(&l_ptr->transmq); | |
1f66d161 | 431 | tipc_link_purge_backlog(l_ptr); |
4323add6 | 432 | tipc_link_reset_fragments(l_ptr); |
b97bf3fd PL |
433 | } |
434 | ||
a18c4bc3 | 435 | void tipc_link_reset(struct tipc_link *l_ptr) |
b97bf3fd | 436 | { |
b97bf3fd | 437 | u32 prev_state = l_ptr->state; |
5392d646 | 438 | int was_active_link = tipc_link_is_active(l_ptr); |
50100a5e | 439 | struct tipc_node *owner = l_ptr->owner; |
dff29b1a | 440 | struct tipc_link *pl = tipc_parallel_link(l_ptr); |
c4307285 | 441 | |
a686e685 | 442 | msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff)); |
b97bf3fd | 443 | |
a686e685 AS |
444 | /* Link is down, accept any session */ |
445 | l_ptr->peer_session = INVALID_SESSION; | |
b97bf3fd | 446 | |
ed193ece JPM |
447 | /* Prepare for renewed mtu size negotiation */ |
448 | l_ptr->mtu = l_ptr->advertised_mtu; | |
c4307285 | 449 | |
b97bf3fd | 450 | l_ptr->state = RESET_UNKNOWN; |
b97bf3fd PL |
451 | |
452 | if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET)) | |
453 | return; | |
454 | ||
9d13ec65 | 455 | tipc_node_link_down(l_ptr->owner, l_ptr->bearer_id); |
7f9f95d9 | 456 | tipc_bearer_remove_dest(owner->net, l_ptr->bearer_id, l_ptr->addr); |
7368ddf1 | 457 | |
dff29b1a JPM |
458 | if (was_active_link && tipc_node_is_up(l_ptr->owner) && (pl != l_ptr)) { |
459 | l_ptr->flags |= LINK_FAILINGOVER; | |
a97b9d3f | 460 | l_ptr->failover_checkpt = l_ptr->rcv_nxt; |
dff29b1a | 461 | pl->failover_pkts = FIRST_FAILOVER; |
a97b9d3f | 462 | pl->failover_checkpt = l_ptr->rcv_nxt; |
dff29b1a JPM |
463 | pl->failover_skb = l_ptr->reasm_buf; |
464 | } else { | |
465 | kfree_skb(l_ptr->reasm_buf); | |
b97bf3fd | 466 | } |
c637c103 | 467 | /* Clean up all queues, except inputq: */ |
05dcc5aa | 468 | __skb_queue_purge(&l_ptr->transmq); |
05dcc5aa | 469 | __skb_queue_purge(&l_ptr->deferdq); |
e6441bae | 470 | if (!owner->inputq) |
d39bbd44 | 471 | owner->inputq = l_ptr->inputq; |
e6441bae JPM |
472 | skb_queue_splice_init(&l_ptr->wakeupq, owner->inputq); |
473 | if (!skb_queue_empty(owner->inputq)) | |
c637c103 | 474 | owner->action_flags |= TIPC_MSG_EVT; |
1f66d161 | 475 | tipc_link_purge_backlog(l_ptr); |
dff29b1a | 476 | l_ptr->reasm_buf = NULL; |
05dcc5aa | 477 | l_ptr->rcv_unacked = 0; |
a97b9d3f JPM |
478 | l_ptr->snd_nxt = 1; |
479 | l_ptr->silent_intv_cnt = 0; | |
b97bf3fd PL |
480 | l_ptr->stale_count = 0; |
481 | link_reset_statistics(l_ptr); | |
b97bf3fd PL |
482 | } |
483 | ||
7f9f95d9 | 484 | static void link_activate(struct tipc_link *link) |
b97bf3fd | 485 | { |
7f9f95d9 YX |
486 | struct tipc_node *node = link->owner; |
487 | ||
a97b9d3f | 488 | link->rcv_nxt = 1; |
7f9f95d9 | 489 | link->stats.recv_info = 1; |
cd4eee3c | 490 | link->silent_intv_cnt = 0; |
9d13ec65 | 491 | tipc_node_link_up(node, link->bearer_id); |
7f9f95d9 | 492 | tipc_bearer_add_dest(node->net, link->bearer_id, link->addr); |
b97bf3fd PL |
493 | } |
494 | ||
495 | /** | |
496 | * link_state_event - link finite state machine | |
497 | * @l_ptr: pointer to link | |
498 | * @event: state machine event to process | |
499 | */ | |
95c96174 | 500 | static void link_state_event(struct tipc_link *l_ptr, unsigned int event) |
b97bf3fd | 501 | { |
a18c4bc3 | 502 | struct tipc_link *other; |
a97b9d3f | 503 | unsigned long timer_intv = l_ptr->keepalive_intv; |
b97bf3fd | 504 | |
7d33939f JPM |
505 | if (l_ptr->flags & LINK_STOPPED) |
506 | return; | |
507 | ||
135daee6 | 508 | if (!(l_ptr->flags & LINK_STARTED) && (event != STARTING_EVT)) |
b97bf3fd PL |
509 | return; /* Not yet. */ |
510 | ||
cd4eee3c | 511 | if (l_ptr->flags & LINK_FAILINGOVER) |
77a7e07a | 512 | return; |
b97bf3fd PL |
513 | |
514 | switch (l_ptr->state) { | |
515 | case WORKING_WORKING: | |
b97bf3fd PL |
516 | switch (event) { |
517 | case TRAFFIC_MSG_EVT: | |
b97bf3fd | 518 | case ACTIVATE_MSG: |
cd4eee3c | 519 | l_ptr->silent_intv_cnt = 0; |
b97bf3fd | 520 | break; |
cd4eee3c JPM |
521 | case SILENCE_EVT: |
522 | if (!l_ptr->silent_intv_cnt) { | |
523 | if (tipc_bclink_acks_missing(l_ptr->owner)) | |
247f0f3c | 524 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
ed193ece | 525 | 0, 0, 0, 0); |
b97bf3fd PL |
526 | break; |
527 | } | |
b97bf3fd | 528 | l_ptr->state = WORKING_UNKNOWN; |
ed193ece | 529 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0); |
b97bf3fd PL |
530 | break; |
531 | case RESET_MSG: | |
3fa9cacd EH |
532 | pr_debug("%s<%s>, requested by peer\n", |
533 | link_rst_msg, l_ptr->name); | |
4323add6 | 534 | tipc_link_reset(l_ptr); |
b97bf3fd | 535 | l_ptr->state = RESET_RESET; |
247f0f3c | 536 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
ed193ece | 537 | 0, 0, 0, 0); |
b97bf3fd PL |
538 | break; |
539 | default: | |
3fa9cacd | 540 | pr_debug("%s%u in WW state\n", link_unk_evt, event); |
b97bf3fd PL |
541 | } |
542 | break; | |
543 | case WORKING_UNKNOWN: | |
b97bf3fd PL |
544 | switch (event) { |
545 | case TRAFFIC_MSG_EVT: | |
b97bf3fd | 546 | case ACTIVATE_MSG: |
b97bf3fd | 547 | l_ptr->state = WORKING_WORKING; |
a97b9d3f | 548 | l_ptr->silent_intv_cnt = 0; |
b97bf3fd PL |
549 | break; |
550 | case RESET_MSG: | |
3fa9cacd EH |
551 | pr_debug("%s<%s>, requested by peer while probing\n", |
552 | link_rst_msg, l_ptr->name); | |
4323add6 | 553 | tipc_link_reset(l_ptr); |
b97bf3fd | 554 | l_ptr->state = RESET_RESET; |
247f0f3c | 555 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
ed193ece | 556 | 0, 0, 0, 0); |
b97bf3fd | 557 | break; |
cd4eee3c JPM |
558 | case SILENCE_EVT: |
559 | if (!l_ptr->silent_intv_cnt) { | |
b97bf3fd | 560 | l_ptr->state = WORKING_WORKING; |
cd4eee3c | 561 | if (tipc_bclink_acks_missing(l_ptr->owner)) |
247f0f3c | 562 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
ed193ece | 563 | 0, 0, 0, 0); |
a97b9d3f JPM |
564 | } else if (l_ptr->silent_intv_cnt < |
565 | l_ptr->abort_limit) { | |
247f0f3c | 566 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
ed193ece | 567 | 1, 0, 0, 0); |
b97bf3fd | 568 | } else { /* Link has failed */ |
3fa9cacd EH |
569 | pr_debug("%s<%s>, peer not responding\n", |
570 | link_rst_msg, l_ptr->name); | |
4323add6 | 571 | tipc_link_reset(l_ptr); |
b97bf3fd | 572 | l_ptr->state = RESET_UNKNOWN; |
247f0f3c | 573 | tipc_link_proto_xmit(l_ptr, RESET_MSG, |
ed193ece | 574 | 0, 0, 0, 0); |
b97bf3fd PL |
575 | } |
576 | break; | |
577 | default: | |
2cf8aa19 | 578 | pr_err("%s%u in WU state\n", link_unk_evt, event); |
b97bf3fd PL |
579 | } |
580 | break; | |
581 | case RESET_UNKNOWN: | |
b97bf3fd PL |
582 | switch (event) { |
583 | case TRAFFIC_MSG_EVT: | |
b97bf3fd PL |
584 | break; |
585 | case ACTIVATE_MSG: | |
9d13ec65 | 586 | other = node_active_link(l_ptr->owner, 0); |
8d64a5ba | 587 | if (other && link_working_unknown(other)) |
b97bf3fd | 588 | break; |
b97bf3fd | 589 | l_ptr->state = WORKING_WORKING; |
b97bf3fd | 590 | link_activate(l_ptr); |
ed193ece | 591 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0); |
c64f7a6a | 592 | if (l_ptr->owner->working_links == 1) |
247f0f3c | 593 | tipc_link_sync_xmit(l_ptr); |
b97bf3fd PL |
594 | break; |
595 | case RESET_MSG: | |
b97bf3fd | 596 | l_ptr->state = RESET_RESET; |
247f0f3c | 597 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
ed193ece | 598 | 1, 0, 0, 0); |
b97bf3fd PL |
599 | break; |
600 | case STARTING_EVT: | |
135daee6 | 601 | l_ptr->flags |= LINK_STARTED; |
a97b9d3f | 602 | link_set_timer(l_ptr, timer_intv); |
af9946fd | 603 | break; |
cd4eee3c | 604 | case SILENCE_EVT: |
ed193ece | 605 | tipc_link_proto_xmit(l_ptr, RESET_MSG, 0, 0, 0, 0); |
b97bf3fd PL |
606 | break; |
607 | default: | |
2cf8aa19 | 608 | pr_err("%s%u in RU state\n", link_unk_evt, event); |
b97bf3fd PL |
609 | } |
610 | break; | |
611 | case RESET_RESET: | |
b97bf3fd PL |
612 | switch (event) { |
613 | case TRAFFIC_MSG_EVT: | |
b97bf3fd | 614 | case ACTIVATE_MSG: |
9d13ec65 | 615 | other = node_active_link(l_ptr->owner, 0); |
8d64a5ba | 616 | if (other && link_working_unknown(other)) |
b97bf3fd | 617 | break; |
b97bf3fd | 618 | l_ptr->state = WORKING_WORKING; |
b97bf3fd | 619 | link_activate(l_ptr); |
ed193ece | 620 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0); |
c64f7a6a | 621 | if (l_ptr->owner->working_links == 1) |
247f0f3c | 622 | tipc_link_sync_xmit(l_ptr); |
b97bf3fd PL |
623 | break; |
624 | case RESET_MSG: | |
b97bf3fd | 625 | break; |
cd4eee3c | 626 | case SILENCE_EVT: |
247f0f3c | 627 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
ed193ece | 628 | 0, 0, 0, 0); |
b97bf3fd PL |
629 | break; |
630 | default: | |
2cf8aa19 | 631 | pr_err("%s%u in RR state\n", link_unk_evt, event); |
b97bf3fd PL |
632 | } |
633 | break; | |
634 | default: | |
2cf8aa19 | 635 | pr_err("Unknown link state %u/%u\n", l_ptr->state, event); |
b97bf3fd PL |
636 | } |
637 | } | |
638 | ||
4f1688b2 | 639 | /** |
9fbfb8b1 | 640 | * __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked |
4f1688b2 | 641 | * @link: link to use |
a6ca1094 YX |
642 | * @list: chain of buffers containing message |
643 | * | |
3127a020 JPM |
644 | * Consumes the buffer chain, except when returning -ELINKCONG, |
645 | * since the caller then may want to make more send attempts. | |
646 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS | |
647 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
4f1688b2 | 648 | */ |
7f9f95d9 YX |
649 | int __tipc_link_xmit(struct net *net, struct tipc_link *link, |
650 | struct sk_buff_head *list) | |
4f1688b2 | 651 | { |
a6ca1094 | 652 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
05dcc5aa | 653 | unsigned int maxwin = link->window; |
f21e897e | 654 | unsigned int i, imp = msg_importance(msg); |
ed193ece | 655 | uint mtu = link->mtu; |
a97b9d3f JPM |
656 | u16 ack = mod(link->rcv_nxt - 1); |
657 | u16 seqno = link->snd_nxt; | |
e4bf4f76 | 658 | u16 bc_last_in = link->owner->bclink.last_in; |
4f1688b2 | 659 | struct tipc_media_addr *addr = &link->media_addr; |
05dcc5aa JPM |
660 | struct sk_buff_head *transmq = &link->transmq; |
661 | struct sk_buff_head *backlogq = &link->backlogq; | |
dd3f9e70 | 662 | struct sk_buff *skb, *bskb; |
4f1688b2 | 663 | |
f21e897e JPM |
664 | /* Match msg importance against this and all higher backlog limits: */ |
665 | for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) { | |
666 | if (unlikely(link->backlog[i].len >= link->backlog[i].limit)) | |
667 | return link_schedule_user(link, list); | |
668 | } | |
05dcc5aa | 669 | if (unlikely(msg_size(msg) > mtu)) { |
a6ca1094 | 670 | __skb_queue_purge(list); |
4f1688b2 JPM |
671 | return -EMSGSIZE; |
672 | } | |
05dcc5aa | 673 | /* Prepare each packet for sending, and add to relevant queue: */ |
dd3f9e70 JPM |
674 | while (skb_queue_len(list)) { |
675 | skb = skb_peek(list); | |
58dc55f2 | 676 | msg = buf_msg(skb); |
05dcc5aa JPM |
677 | msg_set_seqno(msg, seqno); |
678 | msg_set_ack(msg, ack); | |
4f1688b2 JPM |
679 | msg_set_bcast_ack(msg, bc_last_in); |
680 | ||
05dcc5aa | 681 | if (likely(skb_queue_len(transmq) < maxwin)) { |
dd3f9e70 | 682 | __skb_dequeue(list); |
05dcc5aa JPM |
683 | __skb_queue_tail(transmq, skb); |
684 | tipc_bearer_send(net, link->bearer_id, skb, addr); | |
685 | link->rcv_unacked = 0; | |
686 | seqno++; | |
687 | continue; | |
688 | } | |
dd3f9e70 JPM |
689 | if (tipc_msg_bundle(skb_peek_tail(backlogq), msg, mtu)) { |
690 | kfree_skb(__skb_dequeue(list)); | |
4f1688b2 | 691 | link->stats.sent_bundled++; |
4f1688b2 | 692 | continue; |
05dcc5aa | 693 | } |
dd3f9e70 JPM |
694 | if (tipc_msg_make_bundle(&bskb, msg, mtu, link->addr)) { |
695 | kfree_skb(__skb_dequeue(list)); | |
696 | __skb_queue_tail(backlogq, bskb); | |
697 | link->backlog[msg_importance(buf_msg(bskb))].len++; | |
4f1688b2 JPM |
698 | link->stats.sent_bundled++; |
699 | link->stats.sent_bundles++; | |
dd3f9e70 | 700 | continue; |
4f1688b2 | 701 | } |
dd3f9e70 JPM |
702 | link->backlog[imp].len += skb_queue_len(list); |
703 | skb_queue_splice_tail_init(list, backlogq); | |
4f1688b2 | 704 | } |
a97b9d3f | 705 | link->snd_nxt = seqno; |
4f1688b2 JPM |
706 | return 0; |
707 | } | |
708 | ||
a6ca1094 YX |
709 | static void skb2list(struct sk_buff *skb, struct sk_buff_head *list) |
710 | { | |
c637c103 | 711 | skb_queue_head_init(list); |
a6ca1094 YX |
712 | __skb_queue_tail(list, skb); |
713 | } | |
714 | ||
715 | static int __tipc_link_xmit_skb(struct tipc_link *link, struct sk_buff *skb) | |
716 | { | |
717 | struct sk_buff_head head; | |
718 | ||
719 | skb2list(skb, &head); | |
7f9f95d9 | 720 | return __tipc_link_xmit(link->owner->net, link, &head); |
a6ca1094 YX |
721 | } |
722 | ||
3127a020 JPM |
723 | /* tipc_link_xmit_skb(): send single buffer to destination |
724 | * Buffers sent via this functon are generally TIPC_SYSTEM_IMPORTANCE | |
725 | * messages, which will not be rejected | |
726 | * The only exception is datagram messages rerouted after secondary | |
727 | * lookup, which are rare and safe to dispose of anyway. | |
728 | * TODO: Return real return value, and let callers use | |
729 | * tipc_wait_for_sendpkt() where applicable | |
730 | */ | |
f2f9800d YX |
731 | int tipc_link_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode, |
732 | u32 selector) | |
a6ca1094 YX |
733 | { |
734 | struct sk_buff_head head; | |
3127a020 | 735 | int rc; |
a6ca1094 YX |
736 | |
737 | skb2list(skb, &head); | |
3127a020 JPM |
738 | rc = tipc_link_xmit(net, &head, dnode, selector); |
739 | if (rc == -ELINKCONG) | |
740 | kfree_skb(skb); | |
741 | return 0; | |
a6ca1094 YX |
742 | } |
743 | ||
4f1688b2 | 744 | /** |
9fbfb8b1 | 745 | * tipc_link_xmit() is the general link level function for message sending |
f2f9800d | 746 | * @net: the applicable net namespace |
a6ca1094 | 747 | * @list: chain of buffers containing message |
4f1688b2 JPM |
748 | * @dsz: amount of user data to be sent |
749 | * @dnode: address of destination node | |
750 | * @selector: a number used for deterministic link selection | |
751 | * Consumes the buffer chain, except when returning -ELINKCONG | |
752 | * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE | |
753 | */ | |
f2f9800d YX |
754 | int tipc_link_xmit(struct net *net, struct sk_buff_head *list, u32 dnode, |
755 | u32 selector) | |
4f1688b2 JPM |
756 | { |
757 | struct tipc_link *link = NULL; | |
758 | struct tipc_node *node; | |
759 | int rc = -EHOSTUNREACH; | |
760 | ||
f2f9800d | 761 | node = tipc_node_find(net, dnode); |
4f1688b2 JPM |
762 | if (node) { |
763 | tipc_node_lock(node); | |
9d13ec65 | 764 | link = node_active_link(node, selector & 1); |
4f1688b2 | 765 | if (link) |
7f9f95d9 | 766 | rc = __tipc_link_xmit(net, link, list); |
4f1688b2 | 767 | tipc_node_unlock(node); |
8a0f6ebe | 768 | tipc_node_put(node); |
4f1688b2 | 769 | } |
4f1688b2 JPM |
770 | if (link) |
771 | return rc; | |
772 | ||
3bd88ee7 EH |
773 | if (likely(in_own_node(net, dnode))) { |
774 | tipc_sk_rcv(net, list); | |
775 | return 0; | |
776 | } | |
4f1688b2 | 777 | |
c637c103 | 778 | __skb_queue_purge(list); |
4f1688b2 JPM |
779 | return rc; |
780 | } | |
781 | ||
c64f7a6a | 782 | /* |
247f0f3c | 783 | * tipc_link_sync_xmit - synchronize broadcast link endpoints. |
c64f7a6a JM |
784 | * |
785 | * Give a newly added peer node the sequence number where it should | |
786 | * start receiving and acking broadcast packets. | |
787 | * | |
788 | * Called with node locked | |
789 | */ | |
25b660c7 | 790 | static void tipc_link_sync_xmit(struct tipc_link *link) |
c64f7a6a | 791 | { |
a6ca1094 | 792 | struct sk_buff *skb; |
c64f7a6a JM |
793 | struct tipc_msg *msg; |
794 | ||
a6ca1094 YX |
795 | skb = tipc_buf_acquire(INT_H_SIZE); |
796 | if (!skb) | |
c64f7a6a JM |
797 | return; |
798 | ||
a6ca1094 | 799 | msg = buf_msg(skb); |
c5898636 | 800 | tipc_msg_init(link_own_addr(link), msg, BCAST_PROTOCOL, STATE_MSG, |
34747539 | 801 | INT_H_SIZE, link->addr); |
25b660c7 | 802 | msg_set_last_bcast(msg, link->owner->bclink.acked); |
a6ca1094 | 803 | __tipc_link_xmit_skb(link, skb); |
c64f7a6a JM |
804 | } |
805 | ||
806 | /* | |
247f0f3c | 807 | * tipc_link_sync_rcv - synchronize broadcast link endpoints. |
c64f7a6a JM |
808 | * Receive the sequence number where we should start receiving and |
809 | * acking broadcast packets from a newly added peer node, and open | |
810 | * up for reception of such packets. | |
811 | * | |
812 | * Called with node locked | |
813 | */ | |
247f0f3c | 814 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf) |
c64f7a6a JM |
815 | { |
816 | struct tipc_msg *msg = buf_msg(buf); | |
817 | ||
818 | n->bclink.last_sent = n->bclink.last_in = msg_last_bcast(msg); | |
819 | n->bclink.recv_permitted = true; | |
820 | kfree_skb(buf); | |
821 | } | |
822 | ||
c4307285 | 823 | /* |
47b4c9a8 YX |
824 | * tipc_link_push_packets - push unsent packets to bearer |
825 | * | |
826 | * Push out the unsent messages of a link where congestion | |
827 | * has abated. Node is locked. | |
828 | * | |
829 | * Called with node locked | |
b97bf3fd | 830 | */ |
05dcc5aa | 831 | void tipc_link_push_packets(struct tipc_link *link) |
b97bf3fd | 832 | { |
05dcc5aa | 833 | struct sk_buff *skb; |
47b4c9a8 | 834 | struct tipc_msg *msg; |
dd3f9e70 | 835 | u16 seqno = link->snd_nxt; |
a97b9d3f | 836 | u16 ack = mod(link->rcv_nxt - 1); |
b97bf3fd | 837 | |
05dcc5aa JPM |
838 | while (skb_queue_len(&link->transmq) < link->window) { |
839 | skb = __skb_dequeue(&link->backlogq); | |
840 | if (!skb) | |
47b4c9a8 | 841 | break; |
05dcc5aa | 842 | msg = buf_msg(skb); |
1f66d161 | 843 | link->backlog[msg_importance(msg)].len--; |
05dcc5aa | 844 | msg_set_ack(msg, ack); |
dd3f9e70 JPM |
845 | msg_set_seqno(msg, seqno); |
846 | seqno = mod(seqno + 1); | |
05dcc5aa JPM |
847 | msg_set_bcast_ack(msg, link->owner->bclink.last_in); |
848 | link->rcv_unacked = 0; | |
849 | __skb_queue_tail(&link->transmq, skb); | |
850 | tipc_bearer_send(link->owner->net, link->bearer_id, | |
851 | skb, &link->media_addr); | |
b97bf3fd | 852 | } |
dd3f9e70 | 853 | link->snd_nxt = seqno; |
b97bf3fd PL |
854 | } |
855 | ||
3f5a12bd | 856 | void tipc_link_reset_all(struct tipc_node *node) |
d356eeba | 857 | { |
d356eeba AS |
858 | char addr_string[16]; |
859 | u32 i; | |
860 | ||
3f5a12bd | 861 | tipc_node_lock(node); |
d356eeba | 862 | |
2cf8aa19 | 863 | pr_warn("Resetting all links to %s\n", |
3f5a12bd | 864 | tipc_addr_string_fill(addr_string, node->addr)); |
d356eeba AS |
865 | |
866 | for (i = 0; i < MAX_BEARERS; i++) { | |
9d13ec65 JPM |
867 | if (node->links[i].link) { |
868 | link_print(node->links[i].link, "Resetting link\n"); | |
869 | tipc_link_reset(node->links[i].link); | |
d356eeba AS |
870 | } |
871 | } | |
872 | ||
3f5a12bd | 873 | tipc_node_unlock(node); |
d356eeba AS |
874 | } |
875 | ||
a18c4bc3 | 876 | static void link_retransmit_failure(struct tipc_link *l_ptr, |
ae8509c4 | 877 | struct sk_buff *buf) |
d356eeba AS |
878 | { |
879 | struct tipc_msg *msg = buf_msg(buf); | |
1da46568 | 880 | struct net *net = l_ptr->owner->net; |
d356eeba | 881 | |
2cf8aa19 | 882 | pr_warn("Retransmission failure on link <%s>\n", l_ptr->name); |
d356eeba AS |
883 | |
884 | if (l_ptr->addr) { | |
d356eeba | 885 | /* Handle failure on standard link */ |
8d64a5ba | 886 | link_print(l_ptr, "Resetting link\n"); |
d356eeba AS |
887 | tipc_link_reset(l_ptr); |
888 | ||
889 | } else { | |
d356eeba | 890 | /* Handle failure on broadcast link */ |
6c00055a | 891 | struct tipc_node *n_ptr; |
d356eeba AS |
892 | char addr_string[16]; |
893 | ||
2cf8aa19 EH |
894 | pr_info("Msg seq number: %u, ", msg_seqno(msg)); |
895 | pr_cont("Outstanding acks: %lu\n", | |
896 | (unsigned long) TIPC_SKB_CB(buf)->handle); | |
617dbeaa | 897 | |
1da46568 | 898 | n_ptr = tipc_bclink_retransmit_to(net); |
d356eeba | 899 | |
c68ca7b7 | 900 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
2cf8aa19 | 901 | pr_info("Broadcast link info for %s\n", addr_string); |
389dd9bc YX |
902 | pr_info("Reception permitted: %d, Acked: %u\n", |
903 | n_ptr->bclink.recv_permitted, | |
2cf8aa19 EH |
904 | n_ptr->bclink.acked); |
905 | pr_info("Last in: %u, Oos state: %u, Last sent: %u\n", | |
906 | n_ptr->bclink.last_in, | |
907 | n_ptr->bclink.oos_state, | |
908 | n_ptr->bclink.last_sent); | |
d356eeba | 909 | |
b952b2be | 910 | n_ptr->action_flags |= TIPC_BCAST_RESET; |
d356eeba AS |
911 | l_ptr->stale_count = 0; |
912 | } | |
913 | } | |
914 | ||
58dc55f2 | 915 | void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb, |
4323add6 | 916 | u32 retransmits) |
b97bf3fd PL |
917 | { |
918 | struct tipc_msg *msg; | |
919 | ||
58dc55f2 | 920 | if (!skb) |
d356eeba AS |
921 | return; |
922 | ||
58dc55f2 | 923 | msg = buf_msg(skb); |
c4307285 | 924 | |
512137ee | 925 | /* Detect repeated retransmit failures */ |
a97b9d3f | 926 | if (l_ptr->last_retransm == msg_seqno(msg)) { |
512137ee | 927 | if (++l_ptr->stale_count > 100) { |
58dc55f2 | 928 | link_retransmit_failure(l_ptr, skb); |
512137ee | 929 | return; |
d356eeba AS |
930 | } |
931 | } else { | |
a97b9d3f | 932 | l_ptr->last_retransm = msg_seqno(msg); |
512137ee | 933 | l_ptr->stale_count = 1; |
b97bf3fd | 934 | } |
d356eeba | 935 | |
05dcc5aa JPM |
936 | skb_queue_walk_from(&l_ptr->transmq, skb) { |
937 | if (!retransmits) | |
58dc55f2 YX |
938 | break; |
939 | msg = buf_msg(skb); | |
a97b9d3f | 940 | msg_set_ack(msg, mod(l_ptr->rcv_nxt - 1)); |
c4307285 | 941 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
7f9f95d9 YX |
942 | tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, skb, |
943 | &l_ptr->media_addr); | |
3c294cb3 YX |
944 | retransmits--; |
945 | l_ptr->stats.retransmitted++; | |
b97bf3fd | 946 | } |
b97bf3fd PL |
947 | } |
948 | ||
8b4ed863 JPM |
949 | /* link_synch(): check if all packets arrived before the synch |
950 | * point have been consumed | |
951 | * Returns true if the parallel links are synched, otherwise false | |
952 | */ | |
953 | static bool link_synch(struct tipc_link *l) | |
954 | { | |
955 | unsigned int post_synch; | |
956 | struct tipc_link *pl; | |
957 | ||
958 | pl = tipc_parallel_link(l); | |
959 | if (pl == l) | |
960 | goto synched; | |
961 | ||
962 | /* Was last pre-synch packet added to input queue ? */ | |
a97b9d3f | 963 | if (less_eq(pl->rcv_nxt, l->synch_point)) |
8b4ed863 JPM |
964 | return false; |
965 | ||
966 | /* Is it still in the input queue ? */ | |
a97b9d3f | 967 | post_synch = mod(pl->rcv_nxt - l->synch_point) - 1; |
d39bbd44 | 968 | if (skb_queue_len(pl->inputq) > post_synch) |
8b4ed863 JPM |
969 | return false; |
970 | synched: | |
971 | l->flags &= ~LINK_SYNCHING; | |
972 | return true; | |
973 | } | |
974 | ||
f03273f1 YX |
975 | static void link_retrieve_defq(struct tipc_link *link, |
976 | struct sk_buff_head *list) | |
b97bf3fd | 977 | { |
e4bf4f76 | 978 | u16 seq_no; |
b97bf3fd | 979 | |
05dcc5aa | 980 | if (skb_queue_empty(&link->deferdq)) |
f03273f1 YX |
981 | return; |
982 | ||
05dcc5aa | 983 | seq_no = buf_seqno(skb_peek(&link->deferdq)); |
a97b9d3f | 984 | if (seq_no == link->rcv_nxt) |
05dcc5aa | 985 | skb_queue_splice_tail_init(&link->deferdq, list); |
b97bf3fd PL |
986 | } |
987 | ||
b02b69c8 | 988 | /** |
170b3927 | 989 | * tipc_rcv - process TIPC packets/messages arriving from off-node |
f2f9800d | 990 | * @net: the applicable net namespace |
f03273f1 | 991 | * @skb: TIPC packet |
7a2f7d18 | 992 | * @b_ptr: pointer to bearer message arrived on |
b02b69c8 AS |
993 | * |
994 | * Invoked with no locks held. Bearer pointer must point to a valid bearer | |
995 | * structure (i.e. cannot be NULL), but bearer can be inactive. | |
996 | */ | |
c93d3baa | 997 | void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr) |
b97bf3fd | 998 | { |
34747539 | 999 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
f03273f1 YX |
1000 | struct sk_buff_head head; |
1001 | struct tipc_node *n_ptr; | |
1002 | struct tipc_link *l_ptr; | |
1003 | struct sk_buff *skb1, *tmp; | |
1004 | struct tipc_msg *msg; | |
e4bf4f76 JPM |
1005 | u16 seq_no; |
1006 | u16 ackd; | |
f03273f1 | 1007 | u32 released; |
b97bf3fd | 1008 | |
a6ca1094 | 1009 | skb2list(skb, &head); |
85035568 | 1010 | |
f03273f1 | 1011 | while ((skb = __skb_dequeue(&head))) { |
85035568 | 1012 | /* Ensure message is well-formed */ |
cf2157f8 | 1013 | if (unlikely(!tipc_msg_validate(skb))) |
3af390e2 | 1014 | goto discard; |
b97bf3fd | 1015 | |
85035568 | 1016 | /* Handle arrival of a non-unicast link message */ |
f03273f1 | 1017 | msg = buf_msg(skb); |
b97bf3fd | 1018 | if (unlikely(msg_non_seq(msg))) { |
1265a021 | 1019 | if (msg_user(msg) == LINK_CONFIG) |
c93d3baa | 1020 | tipc_disc_rcv(net, skb, b_ptr); |
1265a021 | 1021 | else |
c93d3baa | 1022 | tipc_bclink_rcv(net, skb); |
b97bf3fd PL |
1023 | continue; |
1024 | } | |
c4307285 | 1025 | |
ed33a9c4 | 1026 | /* Discard unicast link messages destined for another node */ |
26008247 | 1027 | if (unlikely(!msg_short(msg) && |
34747539 | 1028 | (msg_destnode(msg) != tn->own_addr))) |
3af390e2 | 1029 | goto discard; |
c4307285 | 1030 | |
5a68d5ee | 1031 | /* Locate neighboring node that sent message */ |
f2f9800d | 1032 | n_ptr = tipc_node_find(net, msg_prevnode(msg)); |
b97bf3fd | 1033 | if (unlikely(!n_ptr)) |
3af390e2 | 1034 | goto discard; |
85035568 | 1035 | |
8a0f6ebe | 1036 | tipc_node_lock(n_ptr); |
b4b56102 | 1037 | /* Locate unicast link endpoint that should handle message */ |
9d13ec65 | 1038 | l_ptr = n_ptr->links[b_ptr->identity].link; |
3af390e2 | 1039 | if (unlikely(!l_ptr)) |
c637c103 | 1040 | goto unlock; |
5a68d5ee | 1041 | |
b4b56102 | 1042 | /* Verify that communication with node is currently allowed */ |
aecb9bb8 | 1043 | if ((n_ptr->action_flags & TIPC_WAIT_PEER_LINKS_DOWN) && |
10f465c4 YX |
1044 | msg_user(msg) == LINK_PROTOCOL && |
1045 | (msg_type(msg) == RESET_MSG || | |
1046 | msg_type(msg) == ACTIVATE_MSG) && | |
1047 | !msg_redundant_link(msg)) | |
aecb9bb8 | 1048 | n_ptr->action_flags &= ~TIPC_WAIT_PEER_LINKS_DOWN; |
10f465c4 YX |
1049 | |
1050 | if (tipc_node_blocked(n_ptr)) | |
c637c103 | 1051 | goto unlock; |
85035568 AS |
1052 | |
1053 | /* Validate message sequence number info */ | |
85035568 AS |
1054 | seq_no = msg_seqno(msg); |
1055 | ackd = msg_ack(msg); | |
1056 | ||
1057 | /* Release acked messages */ | |
2cdf3918 | 1058 | if (unlikely(n_ptr->bclink.acked != msg_bcast_ack(msg))) |
36559591 | 1059 | tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg)); |
b97bf3fd | 1060 | |
58dc55f2 | 1061 | released = 0; |
05dcc5aa JPM |
1062 | skb_queue_walk_safe(&l_ptr->transmq, skb1, tmp) { |
1063 | if (more(buf_seqno(skb1), ackd)) | |
58dc55f2 | 1064 | break; |
05dcc5aa | 1065 | __skb_unlink(skb1, &l_ptr->transmq); |
58dc55f2 YX |
1066 | kfree_skb(skb1); |
1067 | released = 1; | |
b97bf3fd | 1068 | } |
85035568 AS |
1069 | |
1070 | /* Try sending any messages link endpoint has pending */ | |
05dcc5aa | 1071 | if (unlikely(skb_queue_len(&l_ptr->backlogq))) |
47b4c9a8 | 1072 | tipc_link_push_packets(l_ptr); |
a5377831 | 1073 | |
c637c103 | 1074 | if (released && !skb_queue_empty(&l_ptr->wakeupq)) |
50100a5e | 1075 | link_prepare_wakeup(l_ptr); |
a5377831 | 1076 | |
a5377831 | 1077 | /* Process the incoming packet */ |
3af390e2 YX |
1078 | if (unlikely(!link_working_working(l_ptr))) { |
1079 | if (msg_user(msg) == LINK_PROTOCOL) { | |
c5898636 | 1080 | tipc_link_proto_rcv(l_ptr, skb); |
f03273f1 | 1081 | link_retrieve_defq(l_ptr, &head); |
c637c103 JPM |
1082 | skb = NULL; |
1083 | goto unlock; | |
b97bf3fd | 1084 | } |
3af390e2 YX |
1085 | |
1086 | /* Traffic message. Conditionally activate link */ | |
1087 | link_state_event(l_ptr, TRAFFIC_MSG_EVT); | |
1088 | ||
1089 | if (link_working_working(l_ptr)) { | |
1090 | /* Re-insert buffer in front of queue */ | |
f03273f1 | 1091 | __skb_queue_head(&head, skb); |
c637c103 JPM |
1092 | skb = NULL; |
1093 | goto unlock; | |
3af390e2 | 1094 | } |
c637c103 | 1095 | goto unlock; |
3af390e2 YX |
1096 | } |
1097 | ||
1098 | /* Link is now in state WORKING_WORKING */ | |
a97b9d3f | 1099 | if (unlikely(seq_no != l_ptr->rcv_nxt)) { |
c5898636 | 1100 | link_handle_out_of_seq_msg(l_ptr, skb); |
f03273f1 | 1101 | link_retrieve_defq(l_ptr, &head); |
c637c103 JPM |
1102 | skb = NULL; |
1103 | goto unlock; | |
b97bf3fd | 1104 | } |
cd4eee3c JPM |
1105 | l_ptr->silent_intv_cnt = 0; |
1106 | ||
8b4ed863 JPM |
1107 | /* Synchronize with parallel link if applicable */ |
1108 | if (unlikely((l_ptr->flags & LINK_SYNCHING) && !msg_dup(msg))) { | |
0d699f28 JPM |
1109 | if (!link_synch(l_ptr)) |
1110 | goto unlock; | |
8b4ed863 | 1111 | } |
a97b9d3f | 1112 | l_ptr->rcv_nxt++; |
05dcc5aa | 1113 | if (unlikely(!skb_queue_empty(&l_ptr->deferdq))) |
f03273f1 | 1114 | link_retrieve_defq(l_ptr, &head); |
05dcc5aa | 1115 | if (unlikely(++l_ptr->rcv_unacked >= TIPC_MIN_LINK_WIN)) { |
3f53bd8f | 1116 | l_ptr->stats.sent_acks++; |
ed193ece | 1117 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0); |
3f53bd8f | 1118 | } |
c637c103 JPM |
1119 | tipc_link_input(l_ptr, skb); |
1120 | skb = NULL; | |
1121 | unlock: | |
3af390e2 | 1122 | tipc_node_unlock(n_ptr); |
8a0f6ebe | 1123 | tipc_node_put(n_ptr); |
3af390e2 | 1124 | discard: |
c637c103 JPM |
1125 | if (unlikely(skb)) |
1126 | kfree_skb(skb); | |
b97bf3fd | 1127 | } |
b97bf3fd PL |
1128 | } |
1129 | ||
c637c103 | 1130 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 1131 | * |
c637c103 | 1132 | * Consumes buffer if message is of right type |
7ae934be EH |
1133 | * Node lock must be held |
1134 | */ | |
c637c103 | 1135 | static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb) |
7ae934be | 1136 | { |
c637c103 JPM |
1137 | struct tipc_node *node = link->owner; |
1138 | struct tipc_msg *msg = buf_msg(skb); | |
1139 | u32 dport = msg_destport(msg); | |
7ae934be | 1140 | |
7ae934be | 1141 | switch (msg_user(msg)) { |
c637c103 JPM |
1142 | case TIPC_LOW_IMPORTANCE: |
1143 | case TIPC_MEDIUM_IMPORTANCE: | |
1144 | case TIPC_HIGH_IMPORTANCE: | |
1145 | case TIPC_CRITICAL_IMPORTANCE: | |
1146 | case CONN_MANAGER: | |
d39bbd44 JPM |
1147 | if (tipc_skb_queue_tail(link->inputq, skb, dport)) { |
1148 | node->inputq = link->inputq; | |
c637c103 | 1149 | node->action_flags |= TIPC_MSG_EVT; |
7ae934be | 1150 | } |
c637c103 | 1151 | return true; |
7ae934be | 1152 | case NAME_DISTRIBUTOR: |
c637c103 | 1153 | node->bclink.recv_permitted = true; |
d39bbd44 JPM |
1154 | node->namedq = link->namedq; |
1155 | skb_queue_tail(link->namedq, skb); | |
1156 | if (skb_queue_len(link->namedq) == 1) | |
c637c103 JPM |
1157 | node->action_flags |= TIPC_NAMED_MSG_EVT; |
1158 | return true; | |
1159 | case MSG_BUNDLER: | |
dff29b1a | 1160 | case TUNNEL_PROTOCOL: |
c637c103 | 1161 | case MSG_FRAGMENTER: |
7ae934be | 1162 | case BCAST_PROTOCOL: |
c637c103 | 1163 | return false; |
7ae934be | 1164 | default: |
c637c103 JPM |
1165 | pr_warn("Dropping received illegal msg type\n"); |
1166 | kfree_skb(skb); | |
1167 | return false; | |
1168 | }; | |
7ae934be | 1169 | } |
c637c103 JPM |
1170 | |
1171 | /* tipc_link_input - process packet that has passed link protocol check | |
1172 | * | |
1173 | * Consumes buffer | |
1174 | * Node lock must be held | |
7ae934be | 1175 | */ |
c637c103 | 1176 | static void tipc_link_input(struct tipc_link *link, struct sk_buff *skb) |
7ae934be | 1177 | { |
c637c103 JPM |
1178 | struct tipc_node *node = link->owner; |
1179 | struct tipc_msg *msg = buf_msg(skb); | |
1180 | struct sk_buff *iskb; | |
1181 | int pos = 0; | |
1182 | ||
1183 | if (likely(tipc_data_input(link, skb))) | |
1184 | return; | |
7ae934be EH |
1185 | |
1186 | switch (msg_user(msg)) { | |
dff29b1a | 1187 | case TUNNEL_PROTOCOL: |
8b4ed863 JPM |
1188 | if (msg_dup(msg)) { |
1189 | link->flags |= LINK_SYNCHING; | |
1190 | link->synch_point = msg_seqno(msg_get_wrapped(msg)); | |
2da71425 JPM |
1191 | kfree_skb(skb); |
1192 | break; | |
8b4ed863 | 1193 | } |
dff29b1a | 1194 | if (!tipc_link_failover_rcv(link, &skb)) |
c637c103 JPM |
1195 | break; |
1196 | if (msg_user(buf_msg(skb)) != MSG_BUNDLER) { | |
1197 | tipc_data_input(link, skb); | |
1198 | break; | |
1199 | } | |
1200 | case MSG_BUNDLER: | |
1201 | link->stats.recv_bundles++; | |
1202 | link->stats.recv_bundled += msg_msgcnt(msg); | |
1203 | ||
1204 | while (tipc_msg_extract(skb, &iskb, &pos)) | |
1205 | tipc_data_input(link, iskb); | |
7ae934be | 1206 | break; |
c637c103 JPM |
1207 | case MSG_FRAGMENTER: |
1208 | link->stats.recv_fragments++; | |
1209 | if (tipc_buf_append(&link->reasm_buf, &skb)) { | |
1210 | link->stats.recv_fragmented++; | |
1211 | tipc_data_input(link, skb); | |
1212 | } else if (!link->reasm_buf) { | |
1213 | tipc_link_reset(link); | |
1214 | } | |
7ae934be | 1215 | break; |
c637c103 JPM |
1216 | case BCAST_PROTOCOL: |
1217 | tipc_link_sync_rcv(node, skb); | |
7ae934be EH |
1218 | break; |
1219 | default: | |
c637c103 JPM |
1220 | break; |
1221 | }; | |
7ae934be EH |
1222 | } |
1223 | ||
2c53040f | 1224 | /** |
8809b255 AS |
1225 | * tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue |
1226 | * | |
1227 | * Returns increase in queue length (i.e. 0 or 1) | |
b97bf3fd | 1228 | */ |
bc6fecd4 | 1229 | u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb) |
b97bf3fd | 1230 | { |
bc6fecd4 | 1231 | struct sk_buff *skb1; |
e4bf4f76 | 1232 | u16 seq_no = buf_seqno(skb); |
b97bf3fd PL |
1233 | |
1234 | /* Empty queue ? */ | |
bc6fecd4 YX |
1235 | if (skb_queue_empty(list)) { |
1236 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1237 | return 1; |
1238 | } | |
1239 | ||
1240 | /* Last ? */ | |
bc6fecd4 YX |
1241 | if (less(buf_seqno(skb_peek_tail(list)), seq_no)) { |
1242 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1243 | return 1; |
1244 | } | |
1245 | ||
8809b255 | 1246 | /* Locate insertion point in queue, then insert; discard if duplicate */ |
bc6fecd4 | 1247 | skb_queue_walk(list, skb1) { |
e4bf4f76 | 1248 | u16 curr_seqno = buf_seqno(skb1); |
b97bf3fd | 1249 | |
8809b255 | 1250 | if (seq_no == curr_seqno) { |
bc6fecd4 | 1251 | kfree_skb(skb); |
8809b255 | 1252 | return 0; |
b97bf3fd | 1253 | } |
8809b255 AS |
1254 | |
1255 | if (less(seq_no, curr_seqno)) | |
b97bf3fd | 1256 | break; |
8809b255 | 1257 | } |
b97bf3fd | 1258 | |
bc6fecd4 | 1259 | __skb_queue_before(list, skb1, skb); |
8809b255 | 1260 | return 1; |
b97bf3fd PL |
1261 | } |
1262 | ||
8809b255 | 1263 | /* |
b97bf3fd PL |
1264 | * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet |
1265 | */ | |
c5898636 | 1266 | static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr, |
b97bf3fd PL |
1267 | struct sk_buff *buf) |
1268 | { | |
f905730c | 1269 | u32 seq_no = buf_seqno(buf); |
b97bf3fd PL |
1270 | |
1271 | if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) { | |
c5898636 | 1272 | tipc_link_proto_rcv(l_ptr, buf); |
b97bf3fd PL |
1273 | return; |
1274 | } | |
1275 | ||
cd4eee3c JPM |
1276 | /* Record OOS packet arrival */ |
1277 | l_ptr->silent_intv_cnt = 0; | |
b97bf3fd | 1278 | |
c4307285 | 1279 | /* |
b97bf3fd PL |
1280 | * Discard packet if a duplicate; otherwise add it to deferred queue |
1281 | * and notify peer of gap as per protocol specification | |
1282 | */ | |
a97b9d3f | 1283 | if (less(seq_no, l_ptr->rcv_nxt)) { |
b97bf3fd | 1284 | l_ptr->stats.duplicates++; |
5f6d9123 | 1285 | kfree_skb(buf); |
b97bf3fd PL |
1286 | return; |
1287 | } | |
1288 | ||
05dcc5aa | 1289 | if (tipc_link_defer_pkt(&l_ptr->deferdq, buf)) { |
b97bf3fd | 1290 | l_ptr->stats.deferred_recv++; |
05dcc5aa | 1291 | if ((skb_queue_len(&l_ptr->deferdq) % TIPC_MIN_LINK_WIN) == 1) |
ed193ece | 1292 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0); |
bc6fecd4 | 1293 | } else { |
b97bf3fd | 1294 | l_ptr->stats.duplicates++; |
bc6fecd4 | 1295 | } |
b97bf3fd PL |
1296 | } |
1297 | ||
1298 | /* | |
1299 | * Send protocol message to the other endpoint. | |
1300 | */ | |
247f0f3c | 1301 | void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg, |
ed193ece | 1302 | u32 gap, u32 tolerance, u32 priority) |
b97bf3fd | 1303 | { |
1fc54d8f | 1304 | struct sk_buff *buf = NULL; |
b97bf3fd | 1305 | struct tipc_msg *msg = l_ptr->pmsg; |
c4307285 | 1306 | u32 msg_size = sizeof(l_ptr->proto_msg); |
75f0aa49 | 1307 | int r_flag; |
e4bf4f76 | 1308 | u16 last_rcv; |
b97bf3fd | 1309 | |
dff29b1a JPM |
1310 | /* Don't send protocol message during link failover */ |
1311 | if (l_ptr->flags & LINK_FAILINGOVER) | |
b97bf3fd | 1312 | return; |
b4b56102 AS |
1313 | |
1314 | /* Abort non-RESET send if communication with node is prohibited */ | |
10f465c4 | 1315 | if ((tipc_node_blocked(l_ptr->owner)) && (msg_typ != RESET_MSG)) |
b4b56102 AS |
1316 | return; |
1317 | ||
92d2c905 | 1318 | /* Create protocol message with "out-of-sequence" sequence number */ |
b97bf3fd | 1319 | msg_set_type(msg, msg_typ); |
7a2f7d18 | 1320 | msg_set_net_plane(msg, l_ptr->net_plane); |
7a54d4a9 | 1321 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
1da46568 | 1322 | msg_set_last_bcast(msg, tipc_bclink_get_last_sent(l_ptr->owner->net)); |
b97bf3fd PL |
1323 | |
1324 | if (msg_typ == STATE_MSG) { | |
a97b9d3f | 1325 | u16 next_sent = l_ptr->snd_nxt; |
b97bf3fd | 1326 | |
4323add6 | 1327 | if (!tipc_link_is_up(l_ptr)) |
b97bf3fd | 1328 | return; |
b97bf3fd | 1329 | msg_set_next_sent(msg, next_sent); |
05dcc5aa | 1330 | if (!skb_queue_empty(&l_ptr->deferdq)) { |
e4bf4f76 | 1331 | last_rcv = buf_seqno(skb_peek(&l_ptr->deferdq)); |
a97b9d3f | 1332 | gap = mod(last_rcv - l_ptr->rcv_nxt); |
b97bf3fd PL |
1333 | } |
1334 | msg_set_seq_gap(msg, gap); | |
1335 | if (gap) | |
1336 | l_ptr->stats.sent_nacks++; | |
1337 | msg_set_link_tolerance(msg, tolerance); | |
1338 | msg_set_linkprio(msg, priority); | |
ed193ece | 1339 | msg_set_max_pkt(msg, l_ptr->mtu); |
a97b9d3f | 1340 | msg_set_ack(msg, mod(l_ptr->rcv_nxt - 1)); |
b97bf3fd | 1341 | msg_set_probe(msg, probe_msg != 0); |
ed193ece | 1342 | if (probe_msg) |
b97bf3fd | 1343 | l_ptr->stats.sent_probes++; |
b97bf3fd PL |
1344 | l_ptr->stats.sent_states++; |
1345 | } else { /* RESET_MSG or ACTIVATE_MSG */ | |
dff29b1a | 1346 | msg_set_ack(msg, mod(l_ptr->failover_checkpt - 1)); |
b97bf3fd PL |
1347 | msg_set_seq_gap(msg, 0); |
1348 | msg_set_next_sent(msg, 1); | |
f23d9bf2 | 1349 | msg_set_probe(msg, 0); |
b97bf3fd PL |
1350 | msg_set_link_tolerance(msg, l_ptr->tolerance); |
1351 | msg_set_linkprio(msg, l_ptr->priority); | |
ed193ece | 1352 | msg_set_max_pkt(msg, l_ptr->advertised_mtu); |
b97bf3fd PL |
1353 | } |
1354 | ||
75f0aa49 AS |
1355 | r_flag = (l_ptr->owner->working_links > tipc_link_is_up(l_ptr)); |
1356 | msg_set_redundant_link(msg, r_flag); | |
b97bf3fd | 1357 | msg_set_linkprio(msg, l_ptr->priority); |
92d2c905 | 1358 | msg_set_size(msg, msg_size); |
b97bf3fd | 1359 | |
a97b9d3f | 1360 | msg_set_seqno(msg, mod(l_ptr->snd_nxt + (0xffff / 2))); |
b97bf3fd | 1361 | |
31e3c3f6 | 1362 | buf = tipc_buf_acquire(msg_size); |
b97bf3fd PL |
1363 | if (!buf) |
1364 | return; | |
1365 | ||
27d7ff46 | 1366 | skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg)); |
796c75d0 | 1367 | buf->priority = TC_PRIO_CONTROL; |
7f9f95d9 YX |
1368 | tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, buf, |
1369 | &l_ptr->media_addr); | |
05dcc5aa | 1370 | l_ptr->rcv_unacked = 0; |
5f6d9123 | 1371 | kfree_skb(buf); |
b97bf3fd PL |
1372 | } |
1373 | ||
1374 | /* | |
1375 | * Receive protocol message : | |
c4307285 YH |
1376 | * Note that network plane id propagates through the network, and may |
1377 | * change at any time. The node with lowest address rules | |
b97bf3fd | 1378 | */ |
c5898636 | 1379 | static void tipc_link_proto_rcv(struct tipc_link *l_ptr, |
c93d3baa | 1380 | struct sk_buff *buf) |
b97bf3fd PL |
1381 | { |
1382 | u32 rec_gap = 0; | |
b97bf3fd PL |
1383 | u32 msg_tol; |
1384 | struct tipc_msg *msg = buf_msg(buf); | |
1385 | ||
dff29b1a | 1386 | if (l_ptr->flags & LINK_FAILINGOVER) |
b97bf3fd PL |
1387 | goto exit; |
1388 | ||
7a2f7d18 | 1389 | if (l_ptr->net_plane != msg_net_plane(msg)) |
c5898636 | 1390 | if (link_own_addr(l_ptr) > msg_prevnode(msg)) |
7a2f7d18 | 1391 | l_ptr->net_plane = msg_net_plane(msg); |
b97bf3fd | 1392 | |
b97bf3fd | 1393 | switch (msg_type(msg)) { |
c4307285 | 1394 | |
b97bf3fd | 1395 | case RESET_MSG: |
a686e685 AS |
1396 | if (!link_working_unknown(l_ptr) && |
1397 | (l_ptr->peer_session != INVALID_SESSION)) { | |
641c218d AS |
1398 | if (less_eq(msg_session(msg), l_ptr->peer_session)) |
1399 | break; /* duplicate or old reset: ignore */ | |
b97bf3fd | 1400 | } |
b4b56102 AS |
1401 | |
1402 | if (!msg_redundant_link(msg) && (link_working_working(l_ptr) || | |
1403 | link_working_unknown(l_ptr))) { | |
1404 | /* | |
1405 | * peer has lost contact -- don't allow peer's links | |
1406 | * to reactivate before we recognize loss & clean up | |
1407 | */ | |
ca9cf06a | 1408 | l_ptr->owner->action_flags |= TIPC_WAIT_OWN_LINKS_DOWN; |
b4b56102 AS |
1409 | } |
1410 | ||
47361c87 AS |
1411 | link_state_event(l_ptr, RESET_MSG); |
1412 | ||
b97bf3fd PL |
1413 | /* fall thru' */ |
1414 | case ACTIVATE_MSG: | |
1415 | /* Update link settings according other endpoint's values */ | |
b97bf3fd PL |
1416 | strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg)); |
1417 | ||
2db9983a AS |
1418 | msg_tol = msg_link_tolerance(msg); |
1419 | if (msg_tol > l_ptr->tolerance) | |
b97bf3fd PL |
1420 | link_set_supervision_props(l_ptr, msg_tol); |
1421 | ||
1422 | if (msg_linkprio(msg) > l_ptr->priority) | |
1423 | l_ptr->priority = msg_linkprio(msg); | |
1424 | ||
ed193ece JPM |
1425 | if (l_ptr->mtu > msg_max_pkt(msg)) |
1426 | l_ptr->mtu = msg_max_pkt(msg); | |
b97bf3fd | 1427 | |
4d75313c | 1428 | /* Synchronize broadcast link info, if not done previously */ |
7a54d4a9 AS |
1429 | if (!tipc_node_is_up(l_ptr->owner)) { |
1430 | l_ptr->owner->bclink.last_sent = | |
1431 | l_ptr->owner->bclink.last_in = | |
1432 | msg_last_bcast(msg); | |
1433 | l_ptr->owner->bclink.oos_state = 0; | |
1434 | } | |
4d75313c | 1435 | |
b97bf3fd PL |
1436 | l_ptr->peer_session = msg_session(msg); |
1437 | l_ptr->peer_bearer_id = msg_bearer_id(msg); | |
47361c87 AS |
1438 | |
1439 | if (msg_type(msg) == ACTIVATE_MSG) | |
1440 | link_state_event(l_ptr, ACTIVATE_MSG); | |
b97bf3fd PL |
1441 | break; |
1442 | case STATE_MSG: | |
1443 | ||
2db9983a AS |
1444 | msg_tol = msg_link_tolerance(msg); |
1445 | if (msg_tol) | |
b97bf3fd | 1446 | link_set_supervision_props(l_ptr, msg_tol); |
c4307285 YH |
1447 | |
1448 | if (msg_linkprio(msg) && | |
b97bf3fd | 1449 | (msg_linkprio(msg) != l_ptr->priority)) { |
3fa9cacd EH |
1450 | pr_debug("%s<%s>, priority change %u->%u\n", |
1451 | link_rst_msg, l_ptr->name, | |
1452 | l_ptr->priority, msg_linkprio(msg)); | |
b97bf3fd | 1453 | l_ptr->priority = msg_linkprio(msg); |
4323add6 | 1454 | tipc_link_reset(l_ptr); /* Enforce change to take effect */ |
b97bf3fd PL |
1455 | break; |
1456 | } | |
ec37dcd3 JPM |
1457 | |
1458 | /* Record reception; force mismatch at next timeout: */ | |
cd4eee3c | 1459 | l_ptr->silent_intv_cnt = 0; |
ec37dcd3 | 1460 | |
b97bf3fd PL |
1461 | link_state_event(l_ptr, TRAFFIC_MSG_EVT); |
1462 | l_ptr->stats.recv_states++; | |
1463 | if (link_reset_unknown(l_ptr)) | |
1464 | break; | |
1465 | ||
a97b9d3f JPM |
1466 | if (less_eq(l_ptr->rcv_nxt, msg_next_sent(msg))) |
1467 | rec_gap = mod(msg_next_sent(msg) - l_ptr->rcv_nxt); | |
b97bf3fd | 1468 | |
ed193ece | 1469 | if (msg_probe(msg)) |
b97bf3fd | 1470 | l_ptr->stats.recv_probes++; |
b97bf3fd PL |
1471 | |
1472 | /* Protocol message before retransmits, reduce loss risk */ | |
389dd9bc | 1473 | if (l_ptr->owner->bclink.recv_permitted) |
c5898636 | 1474 | tipc_bclink_update_link_state(l_ptr->owner, |
7a54d4a9 | 1475 | msg_last_bcast(msg)); |
b97bf3fd PL |
1476 | |
1477 | if (rec_gap || (msg_probe(msg))) { | |
ed193ece JPM |
1478 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, |
1479 | rec_gap, 0, 0); | |
b97bf3fd PL |
1480 | } |
1481 | if (msg_seq_gap(msg)) { | |
b97bf3fd | 1482 | l_ptr->stats.recv_nacks++; |
05dcc5aa | 1483 | tipc_link_retransmit(l_ptr, skb_peek(&l_ptr->transmq), |
4323add6 | 1484 | msg_seq_gap(msg)); |
b97bf3fd PL |
1485 | } |
1486 | break; | |
b97bf3fd PL |
1487 | } |
1488 | exit: | |
5f6d9123 | 1489 | kfree_skb(buf); |
b97bf3fd PL |
1490 | } |
1491 | ||
1492 | ||
170b3927 JPM |
1493 | /* tipc_link_tunnel_xmit(): Tunnel one packet via a link belonging to |
1494 | * a different bearer. Owner node is locked. | |
b97bf3fd | 1495 | */ |
170b3927 JPM |
1496 | static void tipc_link_tunnel_xmit(struct tipc_link *l_ptr, |
1497 | struct tipc_msg *tunnel_hdr, | |
1498 | struct tipc_msg *msg, | |
1499 | u32 selector) | |
b97bf3fd | 1500 | { |
a18c4bc3 | 1501 | struct tipc_link *tunnel; |
a6ca1094 | 1502 | struct sk_buff *skb; |
b97bf3fd PL |
1503 | u32 length = msg_size(msg); |
1504 | ||
9d13ec65 | 1505 | tunnel = node_active_link(l_ptr->owner, selector & 1); |
5392d646 | 1506 | if (!tipc_link_is_up(tunnel)) { |
2cf8aa19 | 1507 | pr_warn("%stunnel link no longer available\n", link_co_err); |
b97bf3fd | 1508 | return; |
5392d646 | 1509 | } |
b97bf3fd | 1510 | msg_set_size(tunnel_hdr, length + INT_H_SIZE); |
a6ca1094 YX |
1511 | skb = tipc_buf_acquire(length + INT_H_SIZE); |
1512 | if (!skb) { | |
2cf8aa19 | 1513 | pr_warn("%sunable to send tunnel msg\n", link_co_err); |
b97bf3fd | 1514 | return; |
5392d646 | 1515 | } |
a6ca1094 YX |
1516 | skb_copy_to_linear_data(skb, tunnel_hdr, INT_H_SIZE); |
1517 | skb_copy_to_linear_data_offset(skb, INT_H_SIZE, msg, length); | |
1518 | __tipc_link_xmit_skb(tunnel, skb); | |
b97bf3fd PL |
1519 | } |
1520 | ||
1521 | ||
170b3927 JPM |
1522 | /* tipc_link_failover_send_queue(): A link has gone down, but a second |
1523 | * link is still active. We can do failover. Tunnel the failing link's | |
1524 | * whole send queue via the remaining link. This way, we don't lose | |
1525 | * any packets, and sequence order is preserved for subsequent traffic | |
1526 | * sent over the remaining link. Owner node is locked. | |
b97bf3fd | 1527 | */ |
170b3927 | 1528 | void tipc_link_failover_send_queue(struct tipc_link *l_ptr) |
b97bf3fd | 1529 | { |
05dcc5aa | 1530 | int msgcount; |
9d13ec65 | 1531 | struct tipc_link *tunnel = node_active_link(l_ptr->owner, 0); |
b97bf3fd | 1532 | struct tipc_msg tunnel_hdr; |
58dc55f2 | 1533 | struct sk_buff *skb; |
5392d646 | 1534 | int split_bundles; |
b97bf3fd PL |
1535 | |
1536 | if (!tunnel) | |
1537 | return; | |
1538 | ||
dff29b1a JPM |
1539 | tipc_msg_init(link_own_addr(l_ptr), &tunnel_hdr, TUNNEL_PROTOCOL, |
1540 | FAILOVER_MSG, INT_H_SIZE, l_ptr->addr); | |
dd3f9e70 JPM |
1541 | |
1542 | skb_queue_walk(&l_ptr->backlogq, skb) { | |
1543 | msg_set_seqno(buf_msg(skb), l_ptr->snd_nxt); | |
1544 | l_ptr->snd_nxt = mod(l_ptr->snd_nxt + 1); | |
1545 | } | |
05dcc5aa | 1546 | skb_queue_splice_tail_init(&l_ptr->backlogq, &l_ptr->transmq); |
1f66d161 | 1547 | tipc_link_purge_backlog(l_ptr); |
05dcc5aa | 1548 | msgcount = skb_queue_len(&l_ptr->transmq); |
b97bf3fd PL |
1549 | msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id); |
1550 | msg_set_msgcnt(&tunnel_hdr, msgcount); | |
f131072c | 1551 | |
05dcc5aa | 1552 | if (skb_queue_empty(&l_ptr->transmq)) { |
58dc55f2 YX |
1553 | skb = tipc_buf_acquire(INT_H_SIZE); |
1554 | if (skb) { | |
1555 | skb_copy_to_linear_data(skb, &tunnel_hdr, INT_H_SIZE); | |
b97bf3fd | 1556 | msg_set_size(&tunnel_hdr, INT_H_SIZE); |
a6ca1094 | 1557 | __tipc_link_xmit_skb(tunnel, skb); |
b97bf3fd | 1558 | } else { |
2cf8aa19 EH |
1559 | pr_warn("%sunable to send changeover msg\n", |
1560 | link_co_err); | |
b97bf3fd PL |
1561 | } |
1562 | return; | |
1563 | } | |
f131072c | 1564 | |
9d13ec65 JPM |
1565 | split_bundles = (node_active_link(l_ptr->owner, 0) != |
1566 | node_active_link(l_ptr->owner, 0)); | |
5392d646 | 1567 | |
05dcc5aa | 1568 | skb_queue_walk(&l_ptr->transmq, skb) { |
58dc55f2 | 1569 | struct tipc_msg *msg = buf_msg(skb); |
b97bf3fd PL |
1570 | |
1571 | if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) { | |
b97bf3fd | 1572 | struct tipc_msg *m = msg_get_wrapped(msg); |
0e65967e | 1573 | unchar *pos = (unchar *)m; |
b97bf3fd | 1574 | |
d788d805 | 1575 | msgcount = msg_msgcnt(msg); |
b97bf3fd | 1576 | while (msgcount--) { |
0e65967e | 1577 | msg_set_seqno(m, msg_seqno(msg)); |
170b3927 JPM |
1578 | tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, m, |
1579 | msg_link_selector(m)); | |
b97bf3fd PL |
1580 | pos += align(msg_size(m)); |
1581 | m = (struct tipc_msg *)pos; | |
1582 | } | |
1583 | } else { | |
170b3927 JPM |
1584 | tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, msg, |
1585 | msg_link_selector(msg)); | |
b97bf3fd | 1586 | } |
b97bf3fd PL |
1587 | } |
1588 | } | |
1589 | ||
247f0f3c | 1590 | /* tipc_link_dup_queue_xmit(): A second link has become active. Tunnel a |
170b3927 JPM |
1591 | * duplicate of the first link's send queue via the new link. This way, we |
1592 | * are guaranteed that currently queued packets from a socket are delivered | |
1593 | * before future traffic from the same socket, even if this is using the | |
1594 | * new link. The last arriving copy of each duplicate packet is dropped at | |
1595 | * the receiving end by the regular protocol check, so packet cardinality | |
1596 | * and sequence order is preserved per sender/receiver socket pair. | |
1597 | * Owner node is locked. | |
1598 | */ | |
05dcc5aa JPM |
1599 | void tipc_link_dup_queue_xmit(struct tipc_link *link, |
1600 | struct tipc_link *tnl) | |
b97bf3fd | 1601 | { |
58dc55f2 | 1602 | struct sk_buff *skb; |
05dcc5aa JPM |
1603 | struct tipc_msg tnl_hdr; |
1604 | struct sk_buff_head *queue = &link->transmq; | |
1605 | int mcnt; | |
dd3f9e70 | 1606 | u16 seqno; |
05dcc5aa | 1607 | |
dff29b1a JPM |
1608 | tipc_msg_init(link_own_addr(link), &tnl_hdr, TUNNEL_PROTOCOL, |
1609 | SYNCH_MSG, INT_H_SIZE, link->addr); | |
05dcc5aa JPM |
1610 | mcnt = skb_queue_len(&link->transmq) + skb_queue_len(&link->backlogq); |
1611 | msg_set_msgcnt(&tnl_hdr, mcnt); | |
1612 | msg_set_bearer_id(&tnl_hdr, link->peer_bearer_id); | |
1613 | ||
1614 | tunnel_queue: | |
1615 | skb_queue_walk(queue, skb) { | |
58dc55f2 YX |
1616 | struct sk_buff *outskb; |
1617 | struct tipc_msg *msg = buf_msg(skb); | |
05dcc5aa | 1618 | u32 len = msg_size(msg); |
b97bf3fd | 1619 | |
a97b9d3f | 1620 | msg_set_ack(msg, mod(link->rcv_nxt - 1)); |
05dcc5aa JPM |
1621 | msg_set_bcast_ack(msg, link->owner->bclink.last_in); |
1622 | msg_set_size(&tnl_hdr, len + INT_H_SIZE); | |
1623 | outskb = tipc_buf_acquire(len + INT_H_SIZE); | |
58dc55f2 | 1624 | if (outskb == NULL) { |
2cf8aa19 EH |
1625 | pr_warn("%sunable to send duplicate msg\n", |
1626 | link_co_err); | |
b97bf3fd PL |
1627 | return; |
1628 | } | |
05dcc5aa JPM |
1629 | skb_copy_to_linear_data(outskb, &tnl_hdr, INT_H_SIZE); |
1630 | skb_copy_to_linear_data_offset(outskb, INT_H_SIZE, | |
1631 | skb->data, len); | |
1632 | __tipc_link_xmit_skb(tnl, outskb); | |
1633 | if (!tipc_link_is_up(link)) | |
b97bf3fd | 1634 | return; |
b97bf3fd | 1635 | } |
05dcc5aa JPM |
1636 | if (queue == &link->backlogq) |
1637 | return; | |
dd3f9e70 JPM |
1638 | seqno = link->snd_nxt; |
1639 | skb_queue_walk(&link->backlogq, skb) { | |
1640 | msg_set_seqno(buf_msg(skb), seqno); | |
1641 | seqno = mod(seqno + 1); | |
1642 | } | |
05dcc5aa JPM |
1643 | queue = &link->backlogq; |
1644 | goto tunnel_queue; | |
b97bf3fd PL |
1645 | } |
1646 | ||
dff29b1a | 1647 | /* tipc_link_failover_rcv(): Receive a tunnelled FAILOVER_MSG packet |
f006c9c7 JPM |
1648 | * Owner node is locked. |
1649 | */ | |
dff29b1a | 1650 | static bool tipc_link_failover_rcv(struct tipc_link *link, |
2da71425 | 1651 | struct sk_buff **skb) |
f006c9c7 | 1652 | { |
2da71425 JPM |
1653 | struct tipc_msg *msg = buf_msg(*skb); |
1654 | struct sk_buff *iskb = NULL; | |
dff29b1a | 1655 | struct tipc_link *pl = NULL; |
2da71425 | 1656 | int bearer_id = msg_bearer_id(msg); |
c1336ee4 | 1657 | int pos = 0; |
f006c9c7 | 1658 | |
dff29b1a | 1659 | if (msg_type(msg) != FAILOVER_MSG) { |
2da71425 JPM |
1660 | pr_warn("%sunknown tunnel pkt received\n", link_co_err); |
1661 | goto exit; | |
f006c9c7 | 1662 | } |
2da71425 JPM |
1663 | if (bearer_id >= MAX_BEARERS) |
1664 | goto exit; | |
dff29b1a JPM |
1665 | |
1666 | if (bearer_id == link->bearer_id) | |
2da71425 | 1667 | goto exit; |
b97bf3fd | 1668 | |
9d13ec65 | 1669 | pl = link->owner->links[bearer_id].link; |
dff29b1a JPM |
1670 | if (pl && tipc_link_is_up(pl)) |
1671 | tipc_link_reset(pl); | |
1672 | ||
1673 | if (link->failover_pkts == FIRST_FAILOVER) | |
1674 | link->failover_pkts = msg_msgcnt(msg); | |
1e9d47a9 | 1675 | |
2da71425 | 1676 | /* Should we expect an inner packet? */ |
dff29b1a | 1677 | if (!link->failover_pkts) |
cb4b102f | 1678 | goto exit; |
1dab3d5a | 1679 | |
2da71425 JPM |
1680 | if (!tipc_msg_extract(*skb, &iskb, &pos)) { |
1681 | pr_warn("%sno inner failover pkt\n", link_co_err); | |
1682 | *skb = NULL; | |
b97bf3fd | 1683 | goto exit; |
2da71425 | 1684 | } |
dff29b1a | 1685 | link->failover_pkts--; |
2da71425 | 1686 | *skb = NULL; |
b97bf3fd | 1687 | |
dff29b1a JPM |
1688 | /* Was this packet already delivered? */ |
1689 | if (less(buf_seqno(iskb), link->failover_checkpt)) { | |
2da71425 JPM |
1690 | kfree_skb(iskb); |
1691 | iskb = NULL; | |
1692 | goto exit; | |
1693 | } | |
1694 | if (msg_user(buf_msg(iskb)) == MSG_FRAGMENTER) { | |
1695 | link->stats.recv_fragments++; | |
dff29b1a | 1696 | tipc_buf_append(&link->failover_skb, &iskb); |
2da71425 | 1697 | } |
b97bf3fd | 1698 | exit: |
dff29b1a JPM |
1699 | if (!link->failover_pkts && pl) |
1700 | pl->flags &= ~LINK_FAILINGOVER; | |
2da71425 JPM |
1701 | kfree_skb(*skb); |
1702 | *skb = iskb; | |
1703 | return *skb; | |
b97bf3fd PL |
1704 | } |
1705 | ||
2f55c437 | 1706 | static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol) |
b97bf3fd | 1707 | { |
2f55c437 YX |
1708 | unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4; |
1709 | ||
1710 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
5413b4c6 AS |
1711 | return; |
1712 | ||
2f55c437 | 1713 | l_ptr->tolerance = tol; |
a97b9d3f JPM |
1714 | l_ptr->keepalive_intv = msecs_to_jiffies(intv); |
1715 | l_ptr->abort_limit = tol / (jiffies_to_msecs(l_ptr->keepalive_intv)); | |
b97bf3fd PL |
1716 | } |
1717 | ||
e3eea1eb | 1718 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
b97bf3fd | 1719 | { |
ed193ece | 1720 | int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE); |
e3eea1eb JPM |
1721 | |
1722 | l->window = win; | |
1f66d161 JPM |
1723 | l->backlog[TIPC_LOW_IMPORTANCE].limit = win / 2; |
1724 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = win; | |
1725 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = win / 2 * 3; | |
1726 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = win * 2; | |
1727 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; | |
b97bf3fd PL |
1728 | } |
1729 | ||
e099e86c | 1730 | /* tipc_link_find_owner - locate owner node of link by link's name |
f2f9800d | 1731 | * @net: the applicable net namespace |
e099e86c JPM |
1732 | * @name: pointer to link name string |
1733 | * @bearer_id: pointer to index in 'node->links' array where the link was found. | |
c4307285 | 1734 | * |
e099e86c | 1735 | * Returns pointer to node owning the link, or 0 if no matching link is found. |
b97bf3fd | 1736 | */ |
f2f9800d YX |
1737 | static struct tipc_node *tipc_link_find_owner(struct net *net, |
1738 | const char *link_name, | |
e099e86c | 1739 | unsigned int *bearer_id) |
b97bf3fd | 1740 | { |
f2f9800d | 1741 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
a18c4bc3 | 1742 | struct tipc_link *l_ptr; |
bbfbe47c | 1743 | struct tipc_node *n_ptr; |
886eaa1f | 1744 | struct tipc_node *found_node = NULL; |
bbfbe47c | 1745 | int i; |
b97bf3fd | 1746 | |
e099e86c | 1747 | *bearer_id = 0; |
6c7a762e | 1748 | rcu_read_lock(); |
f2f9800d | 1749 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
a11607f5 | 1750 | tipc_node_lock(n_ptr); |
bbfbe47c | 1751 | for (i = 0; i < MAX_BEARERS; i++) { |
9d13ec65 | 1752 | l_ptr = n_ptr->links[i].link; |
e099e86c JPM |
1753 | if (l_ptr && !strcmp(l_ptr->name, link_name)) { |
1754 | *bearer_id = i; | |
1755 | found_node = n_ptr; | |
1756 | break; | |
1757 | } | |
bbfbe47c | 1758 | } |
a11607f5 | 1759 | tipc_node_unlock(n_ptr); |
e099e86c JPM |
1760 | if (found_node) |
1761 | break; | |
bbfbe47c | 1762 | } |
6c7a762e YX |
1763 | rcu_read_unlock(); |
1764 | ||
e099e86c | 1765 | return found_node; |
b97bf3fd PL |
1766 | } |
1767 | ||
b97bf3fd PL |
1768 | /** |
1769 | * link_reset_statistics - reset link statistics | |
1770 | * @l_ptr: pointer to link | |
1771 | */ | |
a18c4bc3 | 1772 | static void link_reset_statistics(struct tipc_link *l_ptr) |
b97bf3fd PL |
1773 | { |
1774 | memset(&l_ptr->stats, 0, sizeof(l_ptr->stats)); | |
a97b9d3f JPM |
1775 | l_ptr->stats.sent_info = l_ptr->snd_nxt; |
1776 | l_ptr->stats.recv_info = l_ptr->rcv_nxt; | |
b97bf3fd PL |
1777 | } |
1778 | ||
a18c4bc3 | 1779 | static void link_print(struct tipc_link *l_ptr, const char *str) |
b97bf3fd | 1780 | { |
7f9f95d9 | 1781 | struct tipc_net *tn = net_generic(l_ptr->owner->net, tipc_net_id); |
7a2f7d18 YX |
1782 | struct tipc_bearer *b_ptr; |
1783 | ||
1784 | rcu_read_lock(); | |
7f9f95d9 | 1785 | b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]); |
7a2f7d18 YX |
1786 | if (b_ptr) |
1787 | pr_info("%s Link %x<%s>:", str, l_ptr->addr, b_ptr->name); | |
1788 | rcu_read_unlock(); | |
8d64a5ba | 1789 | |
b97bf3fd | 1790 | if (link_working_unknown(l_ptr)) |
5deedde9 | 1791 | pr_cont(":WU\n"); |
8d64a5ba | 1792 | else if (link_reset_reset(l_ptr)) |
5deedde9 | 1793 | pr_cont(":RR\n"); |
8d64a5ba | 1794 | else if (link_reset_unknown(l_ptr)) |
5deedde9 | 1795 | pr_cont(":RU\n"); |
8d64a5ba | 1796 | else if (link_working_working(l_ptr)) |
5deedde9 PG |
1797 | pr_cont(":WW\n"); |
1798 | else | |
1799 | pr_cont("\n"); | |
b97bf3fd | 1800 | } |
0655f6a8 RA |
1801 | |
1802 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
1803 | */ | |
1804 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
1805 | { | |
1806 | int err; | |
1807 | ||
1808 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
1809 | tipc_nl_prop_policy); | |
1810 | if (err) | |
1811 | return err; | |
1812 | ||
1813 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1814 | u32 prio; | |
1815 | ||
1816 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1817 | if (prio > TIPC_MAX_LINK_PRI) | |
1818 | return -EINVAL; | |
1819 | } | |
1820 | ||
1821 | if (props[TIPC_NLA_PROP_TOL]) { | |
1822 | u32 tol; | |
1823 | ||
1824 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1825 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
1826 | return -EINVAL; | |
1827 | } | |
1828 | ||
1829 | if (props[TIPC_NLA_PROP_WIN]) { | |
1830 | u32 win; | |
1831 | ||
1832 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1833 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
1834 | return -EINVAL; | |
1835 | } | |
1836 | ||
1837 | return 0; | |
1838 | } | |
7be57fc6 | 1839 | |
f96ce7a2 RA |
1840 | int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info) |
1841 | { | |
1842 | int err; | |
1843 | int res = 0; | |
1844 | int bearer_id; | |
1845 | char *name; | |
1846 | struct tipc_link *link; | |
1847 | struct tipc_node *node; | |
1848 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
37e2d484 | 1849 | struct net *net = sock_net(skb->sk); |
f96ce7a2 RA |
1850 | |
1851 | if (!info->attrs[TIPC_NLA_LINK]) | |
1852 | return -EINVAL; | |
1853 | ||
1854 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
1855 | info->attrs[TIPC_NLA_LINK], | |
1856 | tipc_nl_link_policy); | |
1857 | if (err) | |
1858 | return err; | |
1859 | ||
1860 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
1861 | return -EINVAL; | |
1862 | ||
1863 | name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
1864 | ||
670f4f88 RA |
1865 | if (strcmp(name, tipc_bclink_name) == 0) |
1866 | return tipc_nl_bc_link_set(net, attrs); | |
1867 | ||
f2f9800d | 1868 | node = tipc_link_find_owner(net, name, &bearer_id); |
f96ce7a2 RA |
1869 | if (!node) |
1870 | return -EINVAL; | |
1871 | ||
1872 | tipc_node_lock(node); | |
1873 | ||
9d13ec65 | 1874 | link = node->links[bearer_id].link; |
f96ce7a2 RA |
1875 | if (!link) { |
1876 | res = -EINVAL; | |
1877 | goto out; | |
1878 | } | |
1879 | ||
1880 | if (attrs[TIPC_NLA_LINK_PROP]) { | |
1881 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; | |
1882 | ||
1883 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], | |
1884 | props); | |
1885 | if (err) { | |
1886 | res = err; | |
1887 | goto out; | |
1888 | } | |
1889 | ||
1890 | if (props[TIPC_NLA_PROP_TOL]) { | |
1891 | u32 tol; | |
1892 | ||
1893 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1894 | link_set_supervision_props(link, tol); | |
ed193ece | 1895 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0); |
f96ce7a2 RA |
1896 | } |
1897 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1898 | u32 prio; | |
1899 | ||
1900 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1901 | link->priority = prio; | |
ed193ece | 1902 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio); |
f96ce7a2 RA |
1903 | } |
1904 | if (props[TIPC_NLA_PROP_WIN]) { | |
1905 | u32 win; | |
1906 | ||
1907 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1908 | tipc_link_set_queue_limits(link, win); | |
1909 | } | |
1910 | } | |
1911 | ||
1912 | out: | |
1913 | tipc_node_unlock(node); | |
1914 | ||
1915 | return res; | |
1916 | } | |
d8182804 RA |
1917 | |
1918 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) | |
7be57fc6 RA |
1919 | { |
1920 | int i; | |
1921 | struct nlattr *stats; | |
1922 | ||
1923 | struct nla_map { | |
1924 | u32 key; | |
1925 | u32 val; | |
1926 | }; | |
1927 | ||
1928 | struct nla_map map[] = { | |
1929 | {TIPC_NLA_STATS_RX_INFO, s->recv_info}, | |
1930 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, | |
1931 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
1932 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
1933 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
1934 | {TIPC_NLA_STATS_TX_INFO, s->sent_info}, | |
1935 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, | |
1936 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
1937 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
1938 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
1939 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
1940 | s->msg_length_counts : 1}, | |
1941 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
1942 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
1943 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
1944 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
1945 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
1946 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
1947 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
1948 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
1949 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
1950 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
1951 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
1952 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
1953 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
1954 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
1955 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
1956 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
1957 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
1958 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
1959 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
1960 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
1961 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
1962 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
1963 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
1964 | }; | |
1965 | ||
1966 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
1967 | if (!stats) | |
1968 | return -EMSGSIZE; | |
1969 | ||
1970 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
1971 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
1972 | goto msg_full; | |
1973 | ||
1974 | nla_nest_end(skb, stats); | |
1975 | ||
1976 | return 0; | |
1977 | msg_full: | |
1978 | nla_nest_cancel(skb, stats); | |
1979 | ||
1980 | return -EMSGSIZE; | |
1981 | } | |
1982 | ||
1983 | /* Caller should hold appropriate locks to protect the link */ | |
34747539 | 1984 | static int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
f2f67390 | 1985 | struct tipc_link *link, int nlflags) |
7be57fc6 RA |
1986 | { |
1987 | int err; | |
1988 | void *hdr; | |
1989 | struct nlattr *attrs; | |
1990 | struct nlattr *prop; | |
34747539 | 1991 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
7be57fc6 | 1992 | |
bfb3e5dd | 1993 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
f2f67390 | 1994 | nlflags, TIPC_NL_LINK_GET); |
7be57fc6 RA |
1995 | if (!hdr) |
1996 | return -EMSGSIZE; | |
1997 | ||
1998 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
1999 | if (!attrs) | |
2000 | goto msg_full; | |
2001 | ||
2002 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
2003 | goto attr_msg_full; | |
2004 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, | |
34747539 | 2005 | tipc_cluster_mask(tn->own_addr))) |
7be57fc6 | 2006 | goto attr_msg_full; |
ed193ece | 2007 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
7be57fc6 | 2008 | goto attr_msg_full; |
a97b9d3f | 2009 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->rcv_nxt)) |
7be57fc6 | 2010 | goto attr_msg_full; |
a97b9d3f | 2011 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->snd_nxt)) |
7be57fc6 RA |
2012 | goto attr_msg_full; |
2013 | ||
2014 | if (tipc_link_is_up(link)) | |
2015 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2016 | goto attr_msg_full; | |
2017 | if (tipc_link_is_active(link)) | |
2018 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) | |
2019 | goto attr_msg_full; | |
2020 | ||
2021 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
2022 | if (!prop) | |
2023 | goto attr_msg_full; | |
2024 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2025 | goto prop_msg_full; | |
2026 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
2027 | goto prop_msg_full; | |
2028 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 2029 | link->window)) |
7be57fc6 RA |
2030 | goto prop_msg_full; |
2031 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2032 | goto prop_msg_full; | |
2033 | nla_nest_end(msg->skb, prop); | |
2034 | ||
2035 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
2036 | if (err) | |
2037 | goto attr_msg_full; | |
2038 | ||
2039 | nla_nest_end(msg->skb, attrs); | |
2040 | genlmsg_end(msg->skb, hdr); | |
2041 | ||
2042 | return 0; | |
2043 | ||
2044 | prop_msg_full: | |
2045 | nla_nest_cancel(msg->skb, prop); | |
2046 | attr_msg_full: | |
2047 | nla_nest_cancel(msg->skb, attrs); | |
2048 | msg_full: | |
2049 | genlmsg_cancel(msg->skb, hdr); | |
2050 | ||
2051 | return -EMSGSIZE; | |
2052 | } | |
2053 | ||
2054 | /* Caller should hold node lock */ | |
34747539 YX |
2055 | static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg, |
2056 | struct tipc_node *node, u32 *prev_link) | |
7be57fc6 RA |
2057 | { |
2058 | u32 i; | |
2059 | int err; | |
2060 | ||
2061 | for (i = *prev_link; i < MAX_BEARERS; i++) { | |
2062 | *prev_link = i; | |
2063 | ||
9d13ec65 | 2064 | if (!node->links[i].link) |
7be57fc6 RA |
2065 | continue; |
2066 | ||
9d13ec65 JPM |
2067 | err = __tipc_nl_add_link(net, msg, |
2068 | node->links[i].link, NLM_F_MULTI); | |
7be57fc6 RA |
2069 | if (err) |
2070 | return err; | |
2071 | } | |
2072 | *prev_link = 0; | |
2073 | ||
2074 | return 0; | |
2075 | } | |
2076 | ||
2077 | int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2078 | { | |
f2f9800d YX |
2079 | struct net *net = sock_net(skb->sk); |
2080 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
7be57fc6 RA |
2081 | struct tipc_node *node; |
2082 | struct tipc_nl_msg msg; | |
2083 | u32 prev_node = cb->args[0]; | |
2084 | u32 prev_link = cb->args[1]; | |
2085 | int done = cb->args[2]; | |
2086 | int err; | |
2087 | ||
2088 | if (done) | |
2089 | return 0; | |
2090 | ||
2091 | msg.skb = skb; | |
2092 | msg.portid = NETLINK_CB(cb->skb).portid; | |
2093 | msg.seq = cb->nlh->nlmsg_seq; | |
2094 | ||
2095 | rcu_read_lock(); | |
7be57fc6 | 2096 | if (prev_node) { |
f2f9800d | 2097 | node = tipc_node_find(net, prev_node); |
7be57fc6 RA |
2098 | if (!node) { |
2099 | /* We never set seq or call nl_dump_check_consistent() | |
2100 | * this means that setting prev_seq here will cause the | |
2101 | * consistence check to fail in the netlink callback | |
2102 | * handler. Resulting in the last NLMSG_DONE message | |
2103 | * having the NLM_F_DUMP_INTR flag set. | |
2104 | */ | |
2105 | cb->prev_seq = 1; | |
2106 | goto out; | |
2107 | } | |
8a0f6ebe | 2108 | tipc_node_put(node); |
7be57fc6 | 2109 | |
f2f9800d YX |
2110 | list_for_each_entry_continue_rcu(node, &tn->node_list, |
2111 | list) { | |
7be57fc6 | 2112 | tipc_node_lock(node); |
34747539 YX |
2113 | err = __tipc_nl_add_node_links(net, &msg, node, |
2114 | &prev_link); | |
7be57fc6 RA |
2115 | tipc_node_unlock(node); |
2116 | if (err) | |
2117 | goto out; | |
2118 | ||
2119 | prev_node = node->addr; | |
2120 | } | |
2121 | } else { | |
1da46568 | 2122 | err = tipc_nl_add_bc_link(net, &msg); |
7be57fc6 RA |
2123 | if (err) |
2124 | goto out; | |
2125 | ||
f2f9800d | 2126 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
7be57fc6 | 2127 | tipc_node_lock(node); |
34747539 YX |
2128 | err = __tipc_nl_add_node_links(net, &msg, node, |
2129 | &prev_link); | |
7be57fc6 RA |
2130 | tipc_node_unlock(node); |
2131 | if (err) | |
2132 | goto out; | |
2133 | ||
2134 | prev_node = node->addr; | |
2135 | } | |
2136 | } | |
2137 | done = 1; | |
2138 | out: | |
2139 | rcu_read_unlock(); | |
2140 | ||
2141 | cb->args[0] = prev_node; | |
2142 | cb->args[1] = prev_link; | |
2143 | cb->args[2] = done; | |
2144 | ||
2145 | return skb->len; | |
2146 | } | |
2147 | ||
2148 | int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info) | |
2149 | { | |
f2f9800d | 2150 | struct net *net = genl_info_net(info); |
7be57fc6 | 2151 | struct tipc_nl_msg msg; |
7be57fc6 | 2152 | char *name; |
7be57fc6 RA |
2153 | int err; |
2154 | ||
670f4f88 RA |
2155 | msg.portid = info->snd_portid; |
2156 | msg.seq = info->snd_seq; | |
2157 | ||
7be57fc6 RA |
2158 | if (!info->attrs[TIPC_NLA_LINK_NAME]) |
2159 | return -EINVAL; | |
7be57fc6 | 2160 | name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]); |
7be57fc6 | 2161 | |
670f4f88 RA |
2162 | msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
2163 | if (!msg.skb) | |
7be57fc6 RA |
2164 | return -ENOMEM; |
2165 | ||
670f4f88 RA |
2166 | if (strcmp(name, tipc_bclink_name) == 0) { |
2167 | err = tipc_nl_add_bc_link(net, &msg); | |
2168 | if (err) { | |
2169 | nlmsg_free(msg.skb); | |
2170 | return err; | |
2171 | } | |
2172 | } else { | |
2173 | int bearer_id; | |
2174 | struct tipc_node *node; | |
2175 | struct tipc_link *link; | |
7be57fc6 | 2176 | |
670f4f88 RA |
2177 | node = tipc_link_find_owner(net, name, &bearer_id); |
2178 | if (!node) | |
2179 | return -EINVAL; | |
7be57fc6 | 2180 | |
670f4f88 | 2181 | tipc_node_lock(node); |
9d13ec65 | 2182 | link = node->links[bearer_id].link; |
670f4f88 RA |
2183 | if (!link) { |
2184 | tipc_node_unlock(node); | |
2185 | nlmsg_free(msg.skb); | |
2186 | return -EINVAL; | |
2187 | } | |
7be57fc6 | 2188 | |
670f4f88 RA |
2189 | err = __tipc_nl_add_link(net, &msg, link, 0); |
2190 | tipc_node_unlock(node); | |
2191 | if (err) { | |
2192 | nlmsg_free(msg.skb); | |
2193 | return err; | |
2194 | } | |
2195 | } | |
7be57fc6 | 2196 | |
670f4f88 | 2197 | return genlmsg_reply(msg.skb, info); |
7be57fc6 | 2198 | } |
ae36342b RA |
2199 | |
2200 | int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info) | |
2201 | { | |
2202 | int err; | |
2203 | char *link_name; | |
2204 | unsigned int bearer_id; | |
2205 | struct tipc_link *link; | |
2206 | struct tipc_node *node; | |
2207 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
1817877b | 2208 | struct net *net = sock_net(skb->sk); |
ae36342b RA |
2209 | |
2210 | if (!info->attrs[TIPC_NLA_LINK]) | |
2211 | return -EINVAL; | |
2212 | ||
2213 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
2214 | info->attrs[TIPC_NLA_LINK], | |
2215 | tipc_nl_link_policy); | |
2216 | if (err) | |
2217 | return err; | |
2218 | ||
2219 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
2220 | return -EINVAL; | |
2221 | ||
2222 | link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
2223 | ||
2224 | if (strcmp(link_name, tipc_bclink_name) == 0) { | |
1da46568 | 2225 | err = tipc_bclink_reset_stats(net); |
ae36342b RA |
2226 | if (err) |
2227 | return err; | |
2228 | return 0; | |
2229 | } | |
2230 | ||
f2f9800d | 2231 | node = tipc_link_find_owner(net, link_name, &bearer_id); |
ae36342b RA |
2232 | if (!node) |
2233 | return -EINVAL; | |
2234 | ||
2235 | tipc_node_lock(node); | |
2236 | ||
9d13ec65 | 2237 | link = node->links[bearer_id].link; |
ae36342b RA |
2238 | if (!link) { |
2239 | tipc_node_unlock(node); | |
2240 | return -EINVAL; | |
2241 | } | |
2242 | ||
2243 | link_reset_statistics(link); | |
2244 | ||
2245 | tipc_node_unlock(node); | |
2246 | ||
2247 | return 0; | |
2248 | } |