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