Commit | Line | Data |
---|---|---|
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 ??? */ | |
89 | #define TIMEOUT_EVT 560817u /* link timer expired */ | |
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); |
b97bf3fd | 109 | /* |
05790c64 | 110 | * Simple link routines |
b97bf3fd | 111 | */ |
05790c64 | 112 | static unsigned int align(unsigned int i) |
b97bf3fd PL |
113 | { |
114 | return (i + 3) & ~3u; | |
115 | } | |
116 | ||
2d72d495 JPM |
117 | static void tipc_link_release(struct kref *kref) |
118 | { | |
119 | kfree(container_of(kref, struct tipc_link, ref)); | |
120 | } | |
121 | ||
122 | static void tipc_link_get(struct tipc_link *l_ptr) | |
123 | { | |
124 | kref_get(&l_ptr->ref); | |
125 | } | |
126 | ||
127 | static void tipc_link_put(struct tipc_link *l_ptr) | |
128 | { | |
129 | kref_put(&l_ptr->ref, tipc_link_release); | |
130 | } | |
131 | ||
8b4ed863 JPM |
132 | static struct tipc_link *tipc_parallel_link(struct tipc_link *l) |
133 | { | |
134 | if (l->owner->active_links[0] != l) | |
135 | return l->owner->active_links[0]; | |
136 | return l->owner->active_links[1]; | |
137 | } | |
138 | ||
b97bf3fd | 139 | /* |
05790c64 | 140 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 141 | */ |
a18c4bc3 | 142 | int tipc_link_is_up(struct tipc_link *l_ptr) |
b97bf3fd PL |
143 | { |
144 | if (!l_ptr) | |
145 | return 0; | |
a02cec21 | 146 | return link_working_working(l_ptr) || link_working_unknown(l_ptr); |
b97bf3fd PL |
147 | } |
148 | ||
a18c4bc3 | 149 | int tipc_link_is_active(struct tipc_link *l_ptr) |
b97bf3fd | 150 | { |
a02cec21 ED |
151 | return (l_ptr->owner->active_links[0] == l_ptr) || |
152 | (l_ptr->owner->active_links[1] == l_ptr); | |
b97bf3fd PL |
153 | } |
154 | ||
b97bf3fd PL |
155 | /** |
156 | * link_timeout - handle expiration of link timer | |
157 | * @l_ptr: pointer to link | |
b97bf3fd | 158 | */ |
2f55c437 | 159 | static void link_timeout(unsigned long data) |
b97bf3fd | 160 | { |
2f55c437 | 161 | struct tipc_link *l_ptr = (struct tipc_link *)data; |
58dc55f2 YX |
162 | struct sk_buff *skb; |
163 | ||
4323add6 | 164 | tipc_node_lock(l_ptr->owner); |
b97bf3fd PL |
165 | |
166 | /* update counters used in statistical profiling of send traffic */ | |
05dcc5aa | 167 | l_ptr->stats.accu_queue_sz += skb_queue_len(&l_ptr->transmq); |
b97bf3fd PL |
168 | l_ptr->stats.queue_sz_counts++; |
169 | ||
05dcc5aa | 170 | skb = skb_peek(&l_ptr->transmq); |
58dc55f2 YX |
171 | if (skb) { |
172 | struct tipc_msg *msg = buf_msg(skb); | |
b97bf3fd PL |
173 | u32 length = msg_size(msg); |
174 | ||
f64f9e71 JP |
175 | if ((msg_user(msg) == MSG_FRAGMENTER) && |
176 | (msg_type(msg) == FIRST_FRAGMENT)) { | |
b97bf3fd PL |
177 | length = msg_size(msg_get_wrapped(msg)); |
178 | } | |
179 | if (length) { | |
180 | l_ptr->stats.msg_lengths_total += length; | |
181 | l_ptr->stats.msg_length_counts++; | |
182 | if (length <= 64) | |
183 | l_ptr->stats.msg_length_profile[0]++; | |
184 | else if (length <= 256) | |
185 | l_ptr->stats.msg_length_profile[1]++; | |
186 | else if (length <= 1024) | |
187 | l_ptr->stats.msg_length_profile[2]++; | |
188 | else if (length <= 4096) | |
189 | l_ptr->stats.msg_length_profile[3]++; | |
190 | else if (length <= 16384) | |
191 | l_ptr->stats.msg_length_profile[4]++; | |
192 | else if (length <= 32768) | |
193 | l_ptr->stats.msg_length_profile[5]++; | |
194 | else | |
195 | l_ptr->stats.msg_length_profile[6]++; | |
196 | } | |
197 | } | |
198 | ||
199 | /* do all other link processing performed on a periodic basis */ | |
b97bf3fd PL |
200 | link_state_event(l_ptr, TIMEOUT_EVT); |
201 | ||
05dcc5aa | 202 | if (skb_queue_len(&l_ptr->backlogq)) |
47b4c9a8 | 203 | tipc_link_push_packets(l_ptr); |
b97bf3fd | 204 | |
4323add6 | 205 | tipc_node_unlock(l_ptr->owner); |
2d72d495 | 206 | tipc_link_put(l_ptr); |
b97bf3fd PL |
207 | } |
208 | ||
2f55c437 | 209 | static void link_set_timer(struct tipc_link *link, unsigned long time) |
b97bf3fd | 210 | { |
2d72d495 JPM |
211 | if (!mod_timer(&link->timer, jiffies + time)) |
212 | tipc_link_get(link); | |
b97bf3fd PL |
213 | } |
214 | ||
215 | /** | |
4323add6 | 216 | * tipc_link_create - create a new link |
37b9c08a | 217 | * @n_ptr: pointer to associated node |
b97bf3fd | 218 | * @b_ptr: pointer to associated bearer |
b97bf3fd | 219 | * @media_addr: media address to use when sending messages over link |
c4307285 | 220 | * |
b97bf3fd PL |
221 | * Returns pointer to link. |
222 | */ | |
a18c4bc3 | 223 | struct tipc_link *tipc_link_create(struct tipc_node *n_ptr, |
c61dd61d YX |
224 | struct tipc_bearer *b_ptr, |
225 | const struct tipc_media_addr *media_addr) | |
b97bf3fd | 226 | { |
34747539 | 227 | struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id); |
a18c4bc3 | 228 | struct tipc_link *l_ptr; |
b97bf3fd PL |
229 | struct tipc_msg *msg; |
230 | char *if_name; | |
37b9c08a AS |
231 | char addr_string[16]; |
232 | u32 peer = n_ptr->addr; | |
233 | ||
0372bf5c | 234 | if (n_ptr->link_cnt >= MAX_BEARERS) { |
37b9c08a | 235 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
0372bf5c HB |
236 | pr_err("Attempt to establish %uth link to %s. Max %u allowed.\n", |
237 | n_ptr->link_cnt, addr_string, MAX_BEARERS); | |
37b9c08a AS |
238 | return NULL; |
239 | } | |
240 | ||
241 | if (n_ptr->links[b_ptr->identity]) { | |
242 | tipc_addr_string_fill(addr_string, n_ptr->addr); | |
2cf8aa19 EH |
243 | pr_err("Attempt to establish second link on <%s> to %s\n", |
244 | b_ptr->name, addr_string); | |
37b9c08a AS |
245 | return NULL; |
246 | } | |
b97bf3fd | 247 | |
0da974f4 | 248 | l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC); |
b97bf3fd | 249 | if (!l_ptr) { |
2cf8aa19 | 250 | pr_warn("Link creation failed, no memory\n"); |
b97bf3fd PL |
251 | return NULL; |
252 | } | |
2d72d495 | 253 | kref_init(&l_ptr->ref); |
b97bf3fd | 254 | l_ptr->addr = peer; |
2d627b92 | 255 | if_name = strchr(b_ptr->name, ':') + 1; |
062b4c99 | 256 | sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:unknown", |
34747539 YX |
257 | tipc_zone(tn->own_addr), tipc_cluster(tn->own_addr), |
258 | tipc_node(tn->own_addr), | |
b97bf3fd PL |
259 | if_name, |
260 | tipc_zone(peer), tipc_cluster(peer), tipc_node(peer)); | |
062b4c99 | 261 | /* note: peer i/f name is updated by reset/activate message */ |
b97bf3fd | 262 | memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr)); |
37b9c08a | 263 | l_ptr->owner = n_ptr; |
b97bf3fd | 264 | l_ptr->checkpoint = 1; |
f882cb76 | 265 | l_ptr->peer_session = INVALID_SESSION; |
7a2f7d18 | 266 | l_ptr->bearer_id = b_ptr->identity; |
5c216e1d | 267 | link_set_supervision_props(l_ptr, b_ptr->tolerance); |
b97bf3fd PL |
268 | l_ptr->state = RESET_UNKNOWN; |
269 | ||
270 | l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg; | |
271 | msg = l_ptr->pmsg; | |
c5898636 | 272 | tipc_msg_init(tn->own_addr, msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, |
34747539 | 273 | l_ptr->addr); |
b97bf3fd | 274 | msg_set_size(msg, sizeof(l_ptr->proto_msg)); |
bafa29e3 | 275 | msg_set_session(msg, (tn->random & 0xffff)); |
b97bf3fd PL |
276 | msg_set_bearer_id(msg, b_ptr->identity); |
277 | strcpy((char *)msg_data(msg), if_name); | |
7a2f7d18 | 278 | l_ptr->net_plane = b_ptr->net_plane; |
ed193ece JPM |
279 | l_ptr->advertised_mtu = b_ptr->mtu; |
280 | l_ptr->mtu = l_ptr->advertised_mtu; | |
e3eea1eb JPM |
281 | l_ptr->priority = b_ptr->priority; |
282 | tipc_link_set_queue_limits(l_ptr, b_ptr->window); | |
b97bf3fd | 283 | l_ptr->next_out_no = 1; |
05dcc5aa JPM |
284 | __skb_queue_head_init(&l_ptr->transmq); |
285 | __skb_queue_head_init(&l_ptr->backlogq); | |
286 | __skb_queue_head_init(&l_ptr->deferdq); | |
c637c103 JPM |
287 | skb_queue_head_init(&l_ptr->wakeupq); |
288 | skb_queue_head_init(&l_ptr->inputq); | |
289 | skb_queue_head_init(&l_ptr->namedq); | |
b97bf3fd | 290 | link_reset_statistics(l_ptr); |
37b9c08a | 291 | tipc_node_attach_link(n_ptr, l_ptr); |
2f55c437 | 292 | setup_timer(&l_ptr->timer, link_timeout, (unsigned long)l_ptr); |
581465fa | 293 | link_state_event(l_ptr, STARTING_EVT); |
b97bf3fd | 294 | |
b97bf3fd PL |
295 | return l_ptr; |
296 | } | |
297 | ||
2d72d495 | 298 | /** |
dff29b1a JPM |
299 | * tipc_link_delete - Delete a link |
300 | * @l: link to be deleted | |
2d72d495 | 301 | */ |
dff29b1a | 302 | void tipc_link_delete(struct tipc_link *l) |
2d72d495 | 303 | { |
dff29b1a JPM |
304 | tipc_link_reset(l); |
305 | if (del_timer(&l->timer)) | |
306 | tipc_link_put(l); | |
307 | l->flags |= LINK_STOPPED; | |
308 | /* Delete link now, or when timer is finished: */ | |
309 | tipc_link_reset_fragments(l); | |
310 | tipc_node_detach_link(l->owner, l); | |
311 | tipc_link_put(l); | |
2d72d495 JPM |
312 | } |
313 | ||
f2f9800d YX |
314 | void tipc_link_delete_list(struct net *net, unsigned int bearer_id, |
315 | bool shutting_down) | |
8d8439b6 | 316 | { |
f2f9800d | 317 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
2d72d495 JPM |
318 | struct tipc_link *link; |
319 | struct tipc_node *node; | |
8d8439b6 | 320 | |
6c7a762e | 321 | rcu_read_lock(); |
2d72d495 JPM |
322 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
323 | tipc_node_lock(node); | |
324 | link = node->links[bearer_id]; | |
dff29b1a | 325 | if (link) |
2d72d495 JPM |
326 | tipc_link_delete(link); |
327 | tipc_node_unlock(node); | |
8d8439b6 | 328 | } |
6c7a762e | 329 | rcu_read_unlock(); |
8d8439b6 | 330 | } |
b97bf3fd PL |
331 | |
332 | /** | |
3127a020 | 333 | * link_schedule_user - schedule a message sender for wakeup after congestion |
50100a5e | 334 | * @link: congested link |
3127a020 | 335 | * @list: message that was attempted sent |
50100a5e | 336 | * Create pseudo msg to send back to user when congestion abates |
3127a020 | 337 | * Only consumes message if there is an error |
b97bf3fd | 338 | */ |
3127a020 | 339 | static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list) |
b97bf3fd | 340 | { |
3127a020 JPM |
341 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
342 | int imp = msg_importance(msg); | |
343 | u32 oport = msg_origport(msg); | |
344 | u32 addr = link_own_addr(link); | |
345 | struct sk_buff *skb; | |
346 | ||
347 | /* This really cannot happen... */ | |
348 | if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) { | |
349 | pr_warn("%s<%s>, send queue full", link_rst_msg, link->name); | |
350 | tipc_link_reset(link); | |
351 | goto err; | |
352 | } | |
353 | /* Non-blocking sender: */ | |
354 | if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending) | |
355 | return -ELINKCONG; | |
356 | ||
357 | /* Create and schedule wakeup pseudo message */ | |
358 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, | |
359 | addr, addr, oport, 0, 0); | |
360 | if (!skb) | |
361 | goto err; | |
362 | TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list); | |
363 | TIPC_SKB_CB(skb)->chain_imp = imp; | |
364 | skb_queue_tail(&link->wakeupq, skb); | |
50100a5e | 365 | link->stats.link_congs++; |
3127a020 JPM |
366 | return -ELINKCONG; |
367 | err: | |
368 | __skb_queue_purge(list); | |
369 | return -ENOBUFS; | |
b97bf3fd PL |
370 | } |
371 | ||
50100a5e JPM |
372 | /** |
373 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
374 | * @link: congested link | |
375 | * Move a number of waiting users, as permitted by available space in | |
376 | * the send queue, from link wait queue to node wait queue for wakeup | |
377 | */ | |
1f66d161 | 378 | void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 379 | { |
1f66d161 JPM |
380 | int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,}; |
381 | int imp, lim; | |
58d78b32 | 382 | struct sk_buff *skb, *tmp; |
50100a5e | 383 | |
1f66d161 JPM |
384 | skb_queue_walk_safe(&l->wakeupq, skb, tmp) { |
385 | imp = TIPC_SKB_CB(skb)->chain_imp; | |
386 | lim = l->window + l->backlog[imp].limit; | |
387 | pnd[imp] += TIPC_SKB_CB(skb)->chain_sz; | |
388 | if ((pnd[imp] + l->backlog[imp].len) >= lim) | |
b97bf3fd | 389 | break; |
1f66d161 JPM |
390 | skb_unlink(skb, &l->wakeupq); |
391 | skb_queue_tail(&l->inputq, skb); | |
392 | l->owner->inputq = &l->inputq; | |
393 | l->owner->action_flags |= TIPC_MSG_EVT; | |
b97bf3fd | 394 | } |
b97bf3fd PL |
395 | } |
396 | ||
b97bf3fd | 397 | /** |
4323add6 | 398 | * tipc_link_reset_fragments - purge link's inbound message fragments queue |
b97bf3fd PL |
399 | * @l_ptr: pointer to link |
400 | */ | |
a18c4bc3 | 401 | void tipc_link_reset_fragments(struct tipc_link *l_ptr) |
b97bf3fd | 402 | { |
37e22164 JPM |
403 | kfree_skb(l_ptr->reasm_buf); |
404 | l_ptr->reasm_buf = NULL; | |
b97bf3fd PL |
405 | } |
406 | ||
1f66d161 JPM |
407 | static void tipc_link_purge_backlog(struct tipc_link *l) |
408 | { | |
409 | __skb_queue_purge(&l->backlogq); | |
410 | l->backlog[TIPC_LOW_IMPORTANCE].len = 0; | |
411 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0; | |
412 | l->backlog[TIPC_HIGH_IMPORTANCE].len = 0; | |
413 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0; | |
414 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0; | |
415 | } | |
416 | ||
c4307285 | 417 | /** |
581465fa | 418 | * tipc_link_purge_queues - purge all pkt queues associated with link |
b97bf3fd PL |
419 | * @l_ptr: pointer to link |
420 | */ | |
581465fa | 421 | void tipc_link_purge_queues(struct tipc_link *l_ptr) |
b97bf3fd | 422 | { |
05dcc5aa JPM |
423 | __skb_queue_purge(&l_ptr->deferdq); |
424 | __skb_queue_purge(&l_ptr->transmq); | |
1f66d161 | 425 | tipc_link_purge_backlog(l_ptr); |
4323add6 | 426 | tipc_link_reset_fragments(l_ptr); |
b97bf3fd PL |
427 | } |
428 | ||
a18c4bc3 | 429 | void tipc_link_reset(struct tipc_link *l_ptr) |
b97bf3fd | 430 | { |
b97bf3fd | 431 | u32 prev_state = l_ptr->state; |
5392d646 | 432 | int was_active_link = tipc_link_is_active(l_ptr); |
50100a5e | 433 | struct tipc_node *owner = l_ptr->owner; |
dff29b1a | 434 | struct tipc_link *pl = tipc_parallel_link(l_ptr); |
c4307285 | 435 | |
a686e685 | 436 | msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff)); |
b97bf3fd | 437 | |
a686e685 AS |
438 | /* Link is down, accept any session */ |
439 | l_ptr->peer_session = INVALID_SESSION; | |
b97bf3fd | 440 | |
ed193ece JPM |
441 | /* Prepare for renewed mtu size negotiation */ |
442 | l_ptr->mtu = l_ptr->advertised_mtu; | |
c4307285 | 443 | |
b97bf3fd | 444 | l_ptr->state = RESET_UNKNOWN; |
b97bf3fd PL |
445 | |
446 | if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET)) | |
447 | return; | |
448 | ||
4323add6 | 449 | tipc_node_link_down(l_ptr->owner, l_ptr); |
7f9f95d9 | 450 | tipc_bearer_remove_dest(owner->net, l_ptr->bearer_id, l_ptr->addr); |
7368ddf1 | 451 | |
dff29b1a JPM |
452 | if (was_active_link && tipc_node_is_up(l_ptr->owner) && (pl != l_ptr)) { |
453 | l_ptr->flags |= LINK_FAILINGOVER; | |
454 | l_ptr->failover_checkpt = l_ptr->next_in_no; | |
455 | pl->failover_pkts = FIRST_FAILOVER; | |
456 | pl->failover_checkpt = l_ptr->next_in_no; | |
457 | pl->failover_skb = l_ptr->reasm_buf; | |
458 | } else { | |
459 | kfree_skb(l_ptr->reasm_buf); | |
b97bf3fd | 460 | } |
c637c103 | 461 | /* Clean up all queues, except inputq: */ |
05dcc5aa | 462 | __skb_queue_purge(&l_ptr->transmq); |
05dcc5aa | 463 | __skb_queue_purge(&l_ptr->deferdq); |
e6441bae JPM |
464 | if (!owner->inputq) |
465 | owner->inputq = &l_ptr->inputq; | |
466 | skb_queue_splice_init(&l_ptr->wakeupq, owner->inputq); | |
467 | if (!skb_queue_empty(owner->inputq)) | |
c637c103 | 468 | owner->action_flags |= TIPC_MSG_EVT; |
1f66d161 | 469 | tipc_link_purge_backlog(l_ptr); |
dff29b1a | 470 | l_ptr->reasm_buf = NULL; |
05dcc5aa | 471 | l_ptr->rcv_unacked = 0; |
b97bf3fd PL |
472 | l_ptr->checkpoint = 1; |
473 | l_ptr->next_out_no = 1; | |
b97bf3fd PL |
474 | l_ptr->fsm_msg_cnt = 0; |
475 | l_ptr->stale_count = 0; | |
476 | link_reset_statistics(l_ptr); | |
b97bf3fd PL |
477 | } |
478 | ||
f2f9800d | 479 | void tipc_link_reset_list(struct net *net, unsigned int bearer_id) |
e0ca2c30 | 480 | { |
f2f9800d | 481 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
e0ca2c30 | 482 | struct tipc_link *l_ptr; |
c61dd61d | 483 | struct tipc_node *n_ptr; |
e0ca2c30 | 484 | |
6c7a762e | 485 | rcu_read_lock(); |
f2f9800d | 486 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
5356f3d7 | 487 | tipc_node_lock(n_ptr); |
c61dd61d YX |
488 | l_ptr = n_ptr->links[bearer_id]; |
489 | if (l_ptr) | |
490 | tipc_link_reset(l_ptr); | |
5356f3d7 | 491 | tipc_node_unlock(n_ptr); |
e0ca2c30 | 492 | } |
6c7a762e | 493 | rcu_read_unlock(); |
e0ca2c30 | 494 | } |
b97bf3fd | 495 | |
7f9f95d9 | 496 | static void link_activate(struct tipc_link *link) |
b97bf3fd | 497 | { |
7f9f95d9 YX |
498 | struct tipc_node *node = link->owner; |
499 | ||
500 | link->next_in_no = 1; | |
501 | link->stats.recv_info = 1; | |
502 | tipc_node_link_up(node, link); | |
503 | tipc_bearer_add_dest(node->net, link->bearer_id, link->addr); | |
b97bf3fd PL |
504 | } |
505 | ||
506 | /** | |
507 | * link_state_event - link finite state machine | |
508 | * @l_ptr: pointer to link | |
509 | * @event: state machine event to process | |
510 | */ | |
95c96174 | 511 | static void link_state_event(struct tipc_link *l_ptr, unsigned int event) |
b97bf3fd | 512 | { |
a18c4bc3 | 513 | struct tipc_link *other; |
2f55c437 | 514 | unsigned long cont_intv = l_ptr->cont_intv; |
b97bf3fd | 515 | |
7d33939f JPM |
516 | if (l_ptr->flags & LINK_STOPPED) |
517 | return; | |
518 | ||
135daee6 | 519 | if (!(l_ptr->flags & LINK_STARTED) && (event != STARTING_EVT)) |
b97bf3fd PL |
520 | return; /* Not yet. */ |
521 | ||
dff29b1a | 522 | if (l_ptr->flags & LINK_FAILINGOVER) { |
a016892c | 523 | if (event == TIMEOUT_EVT) |
b97bf3fd | 524 | link_set_timer(l_ptr, cont_intv); |
77a7e07a | 525 | return; |
b97bf3fd | 526 | } |
b97bf3fd PL |
527 | |
528 | switch (l_ptr->state) { | |
529 | case WORKING_WORKING: | |
b97bf3fd PL |
530 | switch (event) { |
531 | case TRAFFIC_MSG_EVT: | |
b97bf3fd | 532 | case ACTIVATE_MSG: |
b97bf3fd PL |
533 | break; |
534 | case TIMEOUT_EVT: | |
b97bf3fd PL |
535 | if (l_ptr->next_in_no != l_ptr->checkpoint) { |
536 | l_ptr->checkpoint = l_ptr->next_in_no; | |
4323add6 | 537 | if (tipc_bclink_acks_missing(l_ptr->owner)) { |
247f0f3c | 538 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
ed193ece | 539 | 0, 0, 0, 0); |
b97bf3fd PL |
540 | l_ptr->fsm_msg_cnt++; |
541 | } | |
542 | link_set_timer(l_ptr, cont_intv); | |
543 | break; | |
544 | } | |
b97bf3fd PL |
545 | l_ptr->state = WORKING_UNKNOWN; |
546 | l_ptr->fsm_msg_cnt = 0; | |
ed193ece | 547 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0); |
b97bf3fd PL |
548 | l_ptr->fsm_msg_cnt++; |
549 | link_set_timer(l_ptr, cont_intv / 4); | |
550 | break; | |
551 | case RESET_MSG: | |
3fa9cacd EH |
552 | pr_debug("%s<%s>, requested by peer\n", |
553 | link_rst_msg, l_ptr->name); | |
4323add6 | 554 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
555 | l_ptr->state = RESET_RESET; |
556 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c | 557 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
ed193ece | 558 | 0, 0, 0, 0); |
b97bf3fd PL |
559 | l_ptr->fsm_msg_cnt++; |
560 | link_set_timer(l_ptr, cont_intv); | |
561 | break; | |
562 | default: | |
3fa9cacd | 563 | pr_debug("%s%u in WW state\n", link_unk_evt, event); |
b97bf3fd PL |
564 | } |
565 | break; | |
566 | case WORKING_UNKNOWN: | |
b97bf3fd PL |
567 | switch (event) { |
568 | case TRAFFIC_MSG_EVT: | |
b97bf3fd | 569 | case ACTIVATE_MSG: |
b97bf3fd PL |
570 | l_ptr->state = WORKING_WORKING; |
571 | l_ptr->fsm_msg_cnt = 0; | |
572 | link_set_timer(l_ptr, cont_intv); | |
573 | break; | |
574 | case RESET_MSG: | |
3fa9cacd EH |
575 | pr_debug("%s<%s>, requested by peer while probing\n", |
576 | link_rst_msg, l_ptr->name); | |
4323add6 | 577 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
578 | l_ptr->state = RESET_RESET; |
579 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c | 580 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
ed193ece | 581 | 0, 0, 0, 0); |
b97bf3fd PL |
582 | l_ptr->fsm_msg_cnt++; |
583 | link_set_timer(l_ptr, cont_intv); | |
584 | break; | |
585 | case TIMEOUT_EVT: | |
b97bf3fd | 586 | if (l_ptr->next_in_no != l_ptr->checkpoint) { |
b97bf3fd PL |
587 | l_ptr->state = WORKING_WORKING; |
588 | l_ptr->fsm_msg_cnt = 0; | |
589 | l_ptr->checkpoint = l_ptr->next_in_no; | |
4323add6 | 590 | if (tipc_bclink_acks_missing(l_ptr->owner)) { |
247f0f3c | 591 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
ed193ece | 592 | 0, 0, 0, 0); |
b97bf3fd PL |
593 | l_ptr->fsm_msg_cnt++; |
594 | } | |
595 | link_set_timer(l_ptr, cont_intv); | |
596 | } else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) { | |
247f0f3c | 597 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
ed193ece | 598 | 1, 0, 0, 0); |
b97bf3fd PL |
599 | l_ptr->fsm_msg_cnt++; |
600 | link_set_timer(l_ptr, cont_intv / 4); | |
601 | } else { /* Link has failed */ | |
3fa9cacd EH |
602 | pr_debug("%s<%s>, peer not responding\n", |
603 | link_rst_msg, l_ptr->name); | |
4323add6 | 604 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
605 | l_ptr->state = RESET_UNKNOWN; |
606 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c | 607 | tipc_link_proto_xmit(l_ptr, RESET_MSG, |
ed193ece | 608 | 0, 0, 0, 0); |
b97bf3fd PL |
609 | l_ptr->fsm_msg_cnt++; |
610 | link_set_timer(l_ptr, cont_intv); | |
611 | } | |
612 | break; | |
613 | default: | |
2cf8aa19 | 614 | pr_err("%s%u in WU state\n", link_unk_evt, event); |
b97bf3fd PL |
615 | } |
616 | break; | |
617 | case RESET_UNKNOWN: | |
b97bf3fd PL |
618 | switch (event) { |
619 | case TRAFFIC_MSG_EVT: | |
b97bf3fd PL |
620 | break; |
621 | case ACTIVATE_MSG: | |
622 | other = l_ptr->owner->active_links[0]; | |
8d64a5ba | 623 | if (other && link_working_unknown(other)) |
b97bf3fd | 624 | break; |
b97bf3fd PL |
625 | l_ptr->state = WORKING_WORKING; |
626 | l_ptr->fsm_msg_cnt = 0; | |
627 | link_activate(l_ptr); | |
ed193ece | 628 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0); |
b97bf3fd | 629 | l_ptr->fsm_msg_cnt++; |
c64f7a6a | 630 | if (l_ptr->owner->working_links == 1) |
247f0f3c | 631 | tipc_link_sync_xmit(l_ptr); |
b97bf3fd PL |
632 | link_set_timer(l_ptr, cont_intv); |
633 | break; | |
634 | case RESET_MSG: | |
b97bf3fd PL |
635 | l_ptr->state = RESET_RESET; |
636 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c | 637 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
ed193ece | 638 | 1, 0, 0, 0); |
b97bf3fd PL |
639 | l_ptr->fsm_msg_cnt++; |
640 | link_set_timer(l_ptr, cont_intv); | |
641 | break; | |
642 | case STARTING_EVT: | |
135daee6 | 643 | l_ptr->flags |= LINK_STARTED; |
af9946fd JPM |
644 | l_ptr->fsm_msg_cnt++; |
645 | link_set_timer(l_ptr, cont_intv); | |
646 | break; | |
b97bf3fd | 647 | case TIMEOUT_EVT: |
ed193ece | 648 | tipc_link_proto_xmit(l_ptr, RESET_MSG, 0, 0, 0, 0); |
b97bf3fd PL |
649 | l_ptr->fsm_msg_cnt++; |
650 | link_set_timer(l_ptr, cont_intv); | |
651 | break; | |
652 | default: | |
2cf8aa19 | 653 | pr_err("%s%u in RU state\n", link_unk_evt, event); |
b97bf3fd PL |
654 | } |
655 | break; | |
656 | case RESET_RESET: | |
b97bf3fd PL |
657 | switch (event) { |
658 | case TRAFFIC_MSG_EVT: | |
b97bf3fd PL |
659 | case ACTIVATE_MSG: |
660 | other = l_ptr->owner->active_links[0]; | |
8d64a5ba | 661 | if (other && link_working_unknown(other)) |
b97bf3fd | 662 | break; |
b97bf3fd PL |
663 | l_ptr->state = WORKING_WORKING; |
664 | l_ptr->fsm_msg_cnt = 0; | |
665 | link_activate(l_ptr); | |
ed193ece | 666 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0); |
b97bf3fd | 667 | l_ptr->fsm_msg_cnt++; |
c64f7a6a | 668 | if (l_ptr->owner->working_links == 1) |
247f0f3c | 669 | tipc_link_sync_xmit(l_ptr); |
b97bf3fd PL |
670 | link_set_timer(l_ptr, cont_intv); |
671 | break; | |
672 | case RESET_MSG: | |
b97bf3fd PL |
673 | break; |
674 | case TIMEOUT_EVT: | |
247f0f3c | 675 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
ed193ece | 676 | 0, 0, 0, 0); |
b97bf3fd PL |
677 | l_ptr->fsm_msg_cnt++; |
678 | link_set_timer(l_ptr, cont_intv); | |
b97bf3fd PL |
679 | break; |
680 | default: | |
2cf8aa19 | 681 | pr_err("%s%u in RR state\n", link_unk_evt, event); |
b97bf3fd PL |
682 | } |
683 | break; | |
684 | default: | |
2cf8aa19 | 685 | pr_err("Unknown link state %u/%u\n", l_ptr->state, event); |
b97bf3fd PL |
686 | } |
687 | } | |
688 | ||
4f1688b2 | 689 | /** |
9fbfb8b1 | 690 | * __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked |
4f1688b2 | 691 | * @link: link to use |
a6ca1094 YX |
692 | * @list: chain of buffers containing message |
693 | * | |
3127a020 JPM |
694 | * Consumes the buffer chain, except when returning -ELINKCONG, |
695 | * since the caller then may want to make more send attempts. | |
696 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS | |
697 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
4f1688b2 | 698 | */ |
7f9f95d9 YX |
699 | int __tipc_link_xmit(struct net *net, struct tipc_link *link, |
700 | struct sk_buff_head *list) | |
4f1688b2 | 701 | { |
a6ca1094 | 702 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
05dcc5aa | 703 | unsigned int maxwin = link->window; |
e3eea1eb | 704 | unsigned int imp = msg_importance(msg); |
ed193ece | 705 | uint mtu = link->mtu; |
4f1688b2 JPM |
706 | uint ack = mod(link->next_in_no - 1); |
707 | uint seqno = link->next_out_no; | |
708 | uint bc_last_in = link->owner->bclink.last_in; | |
709 | struct tipc_media_addr *addr = &link->media_addr; | |
05dcc5aa JPM |
710 | struct sk_buff_head *transmq = &link->transmq; |
711 | struct sk_buff_head *backlogq = &link->backlogq; | |
a6ca1094 | 712 | struct sk_buff *skb, *tmp; |
4f1688b2 | 713 | |
1f66d161 JPM |
714 | /* Match backlog limit against msg importance: */ |
715 | if (unlikely(link->backlog[imp].len >= link->backlog[imp].limit)) | |
3127a020 | 716 | return link_schedule_user(link, list); |
4f1688b2 | 717 | |
05dcc5aa | 718 | if (unlikely(msg_size(msg) > mtu)) { |
a6ca1094 | 719 | __skb_queue_purge(list); |
4f1688b2 JPM |
720 | return -EMSGSIZE; |
721 | } | |
05dcc5aa | 722 | /* Prepare each packet for sending, and add to relevant queue: */ |
a6ca1094 YX |
723 | skb_queue_walk_safe(list, skb, tmp) { |
724 | __skb_unlink(skb, list); | |
58dc55f2 | 725 | msg = buf_msg(skb); |
05dcc5aa JPM |
726 | msg_set_seqno(msg, seqno); |
727 | msg_set_ack(msg, ack); | |
4f1688b2 JPM |
728 | msg_set_bcast_ack(msg, bc_last_in); |
729 | ||
05dcc5aa JPM |
730 | if (likely(skb_queue_len(transmq) < maxwin)) { |
731 | __skb_queue_tail(transmq, skb); | |
732 | tipc_bearer_send(net, link->bearer_id, skb, addr); | |
733 | link->rcv_unacked = 0; | |
734 | seqno++; | |
735 | continue; | |
736 | } | |
737 | if (tipc_msg_bundle(skb_peek_tail(backlogq), skb, mtu)) { | |
4f1688b2 | 738 | link->stats.sent_bundled++; |
4f1688b2 | 739 | continue; |
05dcc5aa JPM |
740 | } |
741 | if (tipc_msg_make_bundle(&skb, mtu, link->addr)) { | |
4f1688b2 JPM |
742 | link->stats.sent_bundled++; |
743 | link->stats.sent_bundles++; | |
1f66d161 | 744 | imp = msg_importance(buf_msg(skb)); |
4f1688b2 | 745 | } |
05dcc5aa | 746 | __skb_queue_tail(backlogq, skb); |
1f66d161 | 747 | link->backlog[imp].len++; |
4f1688b2 | 748 | seqno++; |
4f1688b2 JPM |
749 | } |
750 | link->next_out_no = seqno; | |
4f1688b2 JPM |
751 | return 0; |
752 | } | |
753 | ||
a6ca1094 YX |
754 | static void skb2list(struct sk_buff *skb, struct sk_buff_head *list) |
755 | { | |
c637c103 | 756 | skb_queue_head_init(list); |
a6ca1094 YX |
757 | __skb_queue_tail(list, skb); |
758 | } | |
759 | ||
760 | static int __tipc_link_xmit_skb(struct tipc_link *link, struct sk_buff *skb) | |
761 | { | |
762 | struct sk_buff_head head; | |
763 | ||
764 | skb2list(skb, &head); | |
7f9f95d9 | 765 | return __tipc_link_xmit(link->owner->net, link, &head); |
a6ca1094 YX |
766 | } |
767 | ||
3127a020 JPM |
768 | /* tipc_link_xmit_skb(): send single buffer to destination |
769 | * Buffers sent via this functon are generally TIPC_SYSTEM_IMPORTANCE | |
770 | * messages, which will not be rejected | |
771 | * The only exception is datagram messages rerouted after secondary | |
772 | * lookup, which are rare and safe to dispose of anyway. | |
773 | * TODO: Return real return value, and let callers use | |
774 | * tipc_wait_for_sendpkt() where applicable | |
775 | */ | |
f2f9800d YX |
776 | int tipc_link_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode, |
777 | u32 selector) | |
a6ca1094 YX |
778 | { |
779 | struct sk_buff_head head; | |
3127a020 | 780 | int rc; |
a6ca1094 YX |
781 | |
782 | skb2list(skb, &head); | |
3127a020 JPM |
783 | rc = tipc_link_xmit(net, &head, dnode, selector); |
784 | if (rc == -ELINKCONG) | |
785 | kfree_skb(skb); | |
786 | return 0; | |
a6ca1094 YX |
787 | } |
788 | ||
4f1688b2 | 789 | /** |
9fbfb8b1 | 790 | * tipc_link_xmit() is the general link level function for message sending |
f2f9800d | 791 | * @net: the applicable net namespace |
a6ca1094 | 792 | * @list: chain of buffers containing message |
4f1688b2 JPM |
793 | * @dsz: amount of user data to be sent |
794 | * @dnode: address of destination node | |
795 | * @selector: a number used for deterministic link selection | |
796 | * Consumes the buffer chain, except when returning -ELINKCONG | |
797 | * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE | |
798 | */ | |
f2f9800d YX |
799 | int tipc_link_xmit(struct net *net, struct sk_buff_head *list, u32 dnode, |
800 | u32 selector) | |
4f1688b2 JPM |
801 | { |
802 | struct tipc_link *link = NULL; | |
803 | struct tipc_node *node; | |
804 | int rc = -EHOSTUNREACH; | |
805 | ||
f2f9800d | 806 | node = tipc_node_find(net, dnode); |
4f1688b2 JPM |
807 | if (node) { |
808 | tipc_node_lock(node); | |
809 | link = node->active_links[selector & 1]; | |
810 | if (link) | |
7f9f95d9 | 811 | rc = __tipc_link_xmit(net, link, list); |
4f1688b2 | 812 | tipc_node_unlock(node); |
8a0f6ebe | 813 | tipc_node_put(node); |
4f1688b2 | 814 | } |
4f1688b2 JPM |
815 | if (link) |
816 | return rc; | |
817 | ||
3bd88ee7 EH |
818 | if (likely(in_own_node(net, dnode))) { |
819 | tipc_sk_rcv(net, list); | |
820 | return 0; | |
821 | } | |
4f1688b2 | 822 | |
c637c103 | 823 | __skb_queue_purge(list); |
4f1688b2 JPM |
824 | return rc; |
825 | } | |
826 | ||
c64f7a6a | 827 | /* |
247f0f3c | 828 | * tipc_link_sync_xmit - synchronize broadcast link endpoints. |
c64f7a6a JM |
829 | * |
830 | * Give a newly added peer node the sequence number where it should | |
831 | * start receiving and acking broadcast packets. | |
832 | * | |
833 | * Called with node locked | |
834 | */ | |
25b660c7 | 835 | static void tipc_link_sync_xmit(struct tipc_link *link) |
c64f7a6a | 836 | { |
a6ca1094 | 837 | struct sk_buff *skb; |
c64f7a6a JM |
838 | struct tipc_msg *msg; |
839 | ||
a6ca1094 YX |
840 | skb = tipc_buf_acquire(INT_H_SIZE); |
841 | if (!skb) | |
c64f7a6a JM |
842 | return; |
843 | ||
a6ca1094 | 844 | msg = buf_msg(skb); |
c5898636 | 845 | tipc_msg_init(link_own_addr(link), msg, BCAST_PROTOCOL, STATE_MSG, |
34747539 | 846 | INT_H_SIZE, link->addr); |
25b660c7 | 847 | msg_set_last_bcast(msg, link->owner->bclink.acked); |
a6ca1094 | 848 | __tipc_link_xmit_skb(link, skb); |
c64f7a6a JM |
849 | } |
850 | ||
851 | /* | |
247f0f3c | 852 | * tipc_link_sync_rcv - synchronize broadcast link endpoints. |
c64f7a6a JM |
853 | * Receive the sequence number where we should start receiving and |
854 | * acking broadcast packets from a newly added peer node, and open | |
855 | * up for reception of such packets. | |
856 | * | |
857 | * Called with node locked | |
858 | */ | |
247f0f3c | 859 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf) |
c64f7a6a JM |
860 | { |
861 | struct tipc_msg *msg = buf_msg(buf); | |
862 | ||
863 | n->bclink.last_sent = n->bclink.last_in = msg_last_bcast(msg); | |
864 | n->bclink.recv_permitted = true; | |
865 | kfree_skb(buf); | |
866 | } | |
867 | ||
c4307285 | 868 | /* |
47b4c9a8 YX |
869 | * tipc_link_push_packets - push unsent packets to bearer |
870 | * | |
871 | * Push out the unsent messages of a link where congestion | |
872 | * has abated. Node is locked. | |
873 | * | |
874 | * Called with node locked | |
b97bf3fd | 875 | */ |
05dcc5aa | 876 | void tipc_link_push_packets(struct tipc_link *link) |
b97bf3fd | 877 | { |
05dcc5aa | 878 | struct sk_buff *skb; |
47b4c9a8 | 879 | struct tipc_msg *msg; |
05dcc5aa | 880 | unsigned int ack = mod(link->next_in_no - 1); |
b97bf3fd | 881 | |
05dcc5aa JPM |
882 | while (skb_queue_len(&link->transmq) < link->window) { |
883 | skb = __skb_dequeue(&link->backlogq); | |
884 | if (!skb) | |
47b4c9a8 | 885 | break; |
05dcc5aa | 886 | msg = buf_msg(skb); |
1f66d161 | 887 | link->backlog[msg_importance(msg)].len--; |
05dcc5aa JPM |
888 | msg_set_ack(msg, ack); |
889 | msg_set_bcast_ack(msg, link->owner->bclink.last_in); | |
890 | link->rcv_unacked = 0; | |
891 | __skb_queue_tail(&link->transmq, skb); | |
892 | tipc_bearer_send(link->owner->net, link->bearer_id, | |
893 | skb, &link->media_addr); | |
b97bf3fd | 894 | } |
b97bf3fd PL |
895 | } |
896 | ||
3f5a12bd | 897 | void tipc_link_reset_all(struct tipc_node *node) |
d356eeba | 898 | { |
d356eeba AS |
899 | char addr_string[16]; |
900 | u32 i; | |
901 | ||
3f5a12bd | 902 | tipc_node_lock(node); |
d356eeba | 903 | |
2cf8aa19 | 904 | pr_warn("Resetting all links to %s\n", |
3f5a12bd | 905 | tipc_addr_string_fill(addr_string, node->addr)); |
d356eeba AS |
906 | |
907 | for (i = 0; i < MAX_BEARERS; i++) { | |
3f5a12bd YX |
908 | if (node->links[i]) { |
909 | link_print(node->links[i], "Resetting link\n"); | |
910 | tipc_link_reset(node->links[i]); | |
d356eeba AS |
911 | } |
912 | } | |
913 | ||
3f5a12bd | 914 | tipc_node_unlock(node); |
d356eeba AS |
915 | } |
916 | ||
a18c4bc3 | 917 | static void link_retransmit_failure(struct tipc_link *l_ptr, |
ae8509c4 | 918 | struct sk_buff *buf) |
d356eeba AS |
919 | { |
920 | struct tipc_msg *msg = buf_msg(buf); | |
1da46568 | 921 | struct net *net = l_ptr->owner->net; |
d356eeba | 922 | |
2cf8aa19 | 923 | pr_warn("Retransmission failure on link <%s>\n", l_ptr->name); |
d356eeba AS |
924 | |
925 | if (l_ptr->addr) { | |
d356eeba | 926 | /* Handle failure on standard link */ |
8d64a5ba | 927 | link_print(l_ptr, "Resetting link\n"); |
d356eeba AS |
928 | tipc_link_reset(l_ptr); |
929 | ||
930 | } else { | |
d356eeba | 931 | /* Handle failure on broadcast link */ |
6c00055a | 932 | struct tipc_node *n_ptr; |
d356eeba AS |
933 | char addr_string[16]; |
934 | ||
2cf8aa19 EH |
935 | pr_info("Msg seq number: %u, ", msg_seqno(msg)); |
936 | pr_cont("Outstanding acks: %lu\n", | |
937 | (unsigned long) TIPC_SKB_CB(buf)->handle); | |
617dbeaa | 938 | |
1da46568 | 939 | n_ptr = tipc_bclink_retransmit_to(net); |
d356eeba | 940 | |
c68ca7b7 | 941 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
2cf8aa19 | 942 | pr_info("Broadcast link info for %s\n", addr_string); |
389dd9bc YX |
943 | pr_info("Reception permitted: %d, Acked: %u\n", |
944 | n_ptr->bclink.recv_permitted, | |
2cf8aa19 EH |
945 | n_ptr->bclink.acked); |
946 | pr_info("Last in: %u, Oos state: %u, Last sent: %u\n", | |
947 | n_ptr->bclink.last_in, | |
948 | n_ptr->bclink.oos_state, | |
949 | n_ptr->bclink.last_sent); | |
d356eeba | 950 | |
b952b2be | 951 | n_ptr->action_flags |= TIPC_BCAST_RESET; |
d356eeba AS |
952 | l_ptr->stale_count = 0; |
953 | } | |
954 | } | |
955 | ||
58dc55f2 | 956 | void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb, |
4323add6 | 957 | u32 retransmits) |
b97bf3fd PL |
958 | { |
959 | struct tipc_msg *msg; | |
960 | ||
58dc55f2 | 961 | if (!skb) |
d356eeba AS |
962 | return; |
963 | ||
58dc55f2 | 964 | msg = buf_msg(skb); |
c4307285 | 965 | |
512137ee EH |
966 | /* Detect repeated retransmit failures */ |
967 | if (l_ptr->last_retransmitted == msg_seqno(msg)) { | |
968 | if (++l_ptr->stale_count > 100) { | |
58dc55f2 | 969 | link_retransmit_failure(l_ptr, skb); |
512137ee | 970 | return; |
d356eeba AS |
971 | } |
972 | } else { | |
512137ee EH |
973 | l_ptr->last_retransmitted = msg_seqno(msg); |
974 | l_ptr->stale_count = 1; | |
b97bf3fd | 975 | } |
d356eeba | 976 | |
05dcc5aa JPM |
977 | skb_queue_walk_from(&l_ptr->transmq, skb) { |
978 | if (!retransmits) | |
58dc55f2 YX |
979 | break; |
980 | msg = buf_msg(skb); | |
b97bf3fd | 981 | msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); |
c4307285 | 982 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
7f9f95d9 YX |
983 | tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, skb, |
984 | &l_ptr->media_addr); | |
3c294cb3 YX |
985 | retransmits--; |
986 | l_ptr->stats.retransmitted++; | |
b97bf3fd | 987 | } |
b97bf3fd PL |
988 | } |
989 | ||
8b4ed863 JPM |
990 | /* link_synch(): check if all packets arrived before the synch |
991 | * point have been consumed | |
992 | * Returns true if the parallel links are synched, otherwise false | |
993 | */ | |
994 | static bool link_synch(struct tipc_link *l) | |
995 | { | |
996 | unsigned int post_synch; | |
997 | struct tipc_link *pl; | |
998 | ||
999 | pl = tipc_parallel_link(l); | |
1000 | if (pl == l) | |
1001 | goto synched; | |
1002 | ||
1003 | /* Was last pre-synch packet added to input queue ? */ | |
1004 | if (less_eq(pl->next_in_no, l->synch_point)) | |
1005 | return false; | |
1006 | ||
1007 | /* Is it still in the input queue ? */ | |
1008 | post_synch = mod(pl->next_in_no - l->synch_point) - 1; | |
1009 | if (skb_queue_len(&pl->inputq) > post_synch) | |
1010 | return false; | |
1011 | synched: | |
1012 | l->flags &= ~LINK_SYNCHING; | |
1013 | return true; | |
1014 | } | |
1015 | ||
f03273f1 YX |
1016 | static void link_retrieve_defq(struct tipc_link *link, |
1017 | struct sk_buff_head *list) | |
b97bf3fd PL |
1018 | { |
1019 | u32 seq_no; | |
1020 | ||
05dcc5aa | 1021 | if (skb_queue_empty(&link->deferdq)) |
f03273f1 YX |
1022 | return; |
1023 | ||
05dcc5aa | 1024 | seq_no = buf_seqno(skb_peek(&link->deferdq)); |
f03273f1 | 1025 | if (seq_no == mod(link->next_in_no)) |
05dcc5aa | 1026 | skb_queue_splice_tail_init(&link->deferdq, list); |
b97bf3fd PL |
1027 | } |
1028 | ||
b02b69c8 | 1029 | /** |
170b3927 | 1030 | * tipc_rcv - process TIPC packets/messages arriving from off-node |
f2f9800d | 1031 | * @net: the applicable net namespace |
f03273f1 | 1032 | * @skb: TIPC packet |
7a2f7d18 | 1033 | * @b_ptr: pointer to bearer message arrived on |
b02b69c8 AS |
1034 | * |
1035 | * Invoked with no locks held. Bearer pointer must point to a valid bearer | |
1036 | * structure (i.e. cannot be NULL), but bearer can be inactive. | |
1037 | */ | |
c93d3baa | 1038 | void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr) |
b97bf3fd | 1039 | { |
34747539 | 1040 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
f03273f1 YX |
1041 | struct sk_buff_head head; |
1042 | struct tipc_node *n_ptr; | |
1043 | struct tipc_link *l_ptr; | |
1044 | struct sk_buff *skb1, *tmp; | |
1045 | struct tipc_msg *msg; | |
1046 | u32 seq_no; | |
1047 | u32 ackd; | |
1048 | u32 released; | |
b97bf3fd | 1049 | |
a6ca1094 | 1050 | skb2list(skb, &head); |
85035568 | 1051 | |
f03273f1 | 1052 | while ((skb = __skb_dequeue(&head))) { |
85035568 | 1053 | /* Ensure message is well-formed */ |
cf2157f8 | 1054 | if (unlikely(!tipc_msg_validate(skb))) |
3af390e2 | 1055 | goto discard; |
b97bf3fd | 1056 | |
85035568 | 1057 | /* Handle arrival of a non-unicast link message */ |
f03273f1 | 1058 | msg = buf_msg(skb); |
b97bf3fd | 1059 | if (unlikely(msg_non_seq(msg))) { |
1265a021 | 1060 | if (msg_user(msg) == LINK_CONFIG) |
c93d3baa | 1061 | tipc_disc_rcv(net, skb, b_ptr); |
1265a021 | 1062 | else |
c93d3baa | 1063 | tipc_bclink_rcv(net, skb); |
b97bf3fd PL |
1064 | continue; |
1065 | } | |
c4307285 | 1066 | |
ed33a9c4 | 1067 | /* Discard unicast link messages destined for another node */ |
26008247 | 1068 | if (unlikely(!msg_short(msg) && |
34747539 | 1069 | (msg_destnode(msg) != tn->own_addr))) |
3af390e2 | 1070 | goto discard; |
c4307285 | 1071 | |
5a68d5ee | 1072 | /* Locate neighboring node that sent message */ |
f2f9800d | 1073 | n_ptr = tipc_node_find(net, msg_prevnode(msg)); |
b97bf3fd | 1074 | if (unlikely(!n_ptr)) |
3af390e2 | 1075 | goto discard; |
85035568 | 1076 | |
8a0f6ebe | 1077 | tipc_node_lock(n_ptr); |
b4b56102 | 1078 | /* Locate unicast link endpoint that should handle message */ |
b4b56102 | 1079 | l_ptr = n_ptr->links[b_ptr->identity]; |
3af390e2 | 1080 | if (unlikely(!l_ptr)) |
c637c103 | 1081 | goto unlock; |
5a68d5ee | 1082 | |
b4b56102 | 1083 | /* Verify that communication with node is currently allowed */ |
aecb9bb8 | 1084 | if ((n_ptr->action_flags & TIPC_WAIT_PEER_LINKS_DOWN) && |
10f465c4 YX |
1085 | msg_user(msg) == LINK_PROTOCOL && |
1086 | (msg_type(msg) == RESET_MSG || | |
1087 | msg_type(msg) == ACTIVATE_MSG) && | |
1088 | !msg_redundant_link(msg)) | |
aecb9bb8 | 1089 | n_ptr->action_flags &= ~TIPC_WAIT_PEER_LINKS_DOWN; |
10f465c4 YX |
1090 | |
1091 | if (tipc_node_blocked(n_ptr)) | |
c637c103 | 1092 | goto unlock; |
85035568 AS |
1093 | |
1094 | /* Validate message sequence number info */ | |
85035568 AS |
1095 | seq_no = msg_seqno(msg); |
1096 | ackd = msg_ack(msg); | |
1097 | ||
1098 | /* Release acked messages */ | |
2cdf3918 | 1099 | if (unlikely(n_ptr->bclink.acked != msg_bcast_ack(msg))) |
36559591 | 1100 | tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg)); |
b97bf3fd | 1101 | |
58dc55f2 | 1102 | released = 0; |
05dcc5aa JPM |
1103 | skb_queue_walk_safe(&l_ptr->transmq, skb1, tmp) { |
1104 | if (more(buf_seqno(skb1), ackd)) | |
58dc55f2 | 1105 | break; |
05dcc5aa | 1106 | __skb_unlink(skb1, &l_ptr->transmq); |
58dc55f2 YX |
1107 | kfree_skb(skb1); |
1108 | released = 1; | |
b97bf3fd | 1109 | } |
85035568 AS |
1110 | |
1111 | /* Try sending any messages link endpoint has pending */ | |
05dcc5aa | 1112 | if (unlikely(skb_queue_len(&l_ptr->backlogq))) |
47b4c9a8 | 1113 | tipc_link_push_packets(l_ptr); |
a5377831 | 1114 | |
c637c103 | 1115 | if (released && !skb_queue_empty(&l_ptr->wakeupq)) |
50100a5e | 1116 | link_prepare_wakeup(l_ptr); |
a5377831 | 1117 | |
a5377831 | 1118 | /* Process the incoming packet */ |
3af390e2 YX |
1119 | if (unlikely(!link_working_working(l_ptr))) { |
1120 | if (msg_user(msg) == LINK_PROTOCOL) { | |
c5898636 | 1121 | tipc_link_proto_rcv(l_ptr, skb); |
f03273f1 | 1122 | link_retrieve_defq(l_ptr, &head); |
c637c103 JPM |
1123 | skb = NULL; |
1124 | goto unlock; | |
b97bf3fd | 1125 | } |
3af390e2 YX |
1126 | |
1127 | /* Traffic message. Conditionally activate link */ | |
1128 | link_state_event(l_ptr, TRAFFIC_MSG_EVT); | |
1129 | ||
1130 | if (link_working_working(l_ptr)) { | |
1131 | /* Re-insert buffer in front of queue */ | |
f03273f1 | 1132 | __skb_queue_head(&head, skb); |
c637c103 JPM |
1133 | skb = NULL; |
1134 | goto unlock; | |
3af390e2 | 1135 | } |
c637c103 | 1136 | goto unlock; |
3af390e2 YX |
1137 | } |
1138 | ||
1139 | /* Link is now in state WORKING_WORKING */ | |
1140 | if (unlikely(seq_no != mod(l_ptr->next_in_no))) { | |
c5898636 | 1141 | link_handle_out_of_seq_msg(l_ptr, skb); |
f03273f1 | 1142 | link_retrieve_defq(l_ptr, &head); |
c637c103 JPM |
1143 | skb = NULL; |
1144 | goto unlock; | |
b97bf3fd | 1145 | } |
8b4ed863 JPM |
1146 | /* Synchronize with parallel link if applicable */ |
1147 | if (unlikely((l_ptr->flags & LINK_SYNCHING) && !msg_dup(msg))) { | |
1148 | link_handle_out_of_seq_msg(l_ptr, skb); | |
1149 | if (link_synch(l_ptr)) | |
1150 | link_retrieve_defq(l_ptr, &head); | |
1151 | skb = NULL; | |
1152 | goto unlock; | |
1153 | } | |
3af390e2 | 1154 | l_ptr->next_in_no++; |
05dcc5aa | 1155 | if (unlikely(!skb_queue_empty(&l_ptr->deferdq))) |
f03273f1 | 1156 | link_retrieve_defq(l_ptr, &head); |
05dcc5aa | 1157 | if (unlikely(++l_ptr->rcv_unacked >= TIPC_MIN_LINK_WIN)) { |
3f53bd8f | 1158 | l_ptr->stats.sent_acks++; |
ed193ece | 1159 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0); |
3f53bd8f | 1160 | } |
c637c103 JPM |
1161 | tipc_link_input(l_ptr, skb); |
1162 | skb = NULL; | |
1163 | unlock: | |
3af390e2 | 1164 | tipc_node_unlock(n_ptr); |
8a0f6ebe | 1165 | tipc_node_put(n_ptr); |
3af390e2 | 1166 | discard: |
c637c103 JPM |
1167 | if (unlikely(skb)) |
1168 | kfree_skb(skb); | |
b97bf3fd | 1169 | } |
b97bf3fd PL |
1170 | } |
1171 | ||
c637c103 | 1172 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 1173 | * |
c637c103 | 1174 | * Consumes buffer if message is of right type |
7ae934be EH |
1175 | * Node lock must be held |
1176 | */ | |
c637c103 | 1177 | static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb) |
7ae934be | 1178 | { |
c637c103 JPM |
1179 | struct tipc_node *node = link->owner; |
1180 | struct tipc_msg *msg = buf_msg(skb); | |
1181 | u32 dport = msg_destport(msg); | |
7ae934be | 1182 | |
7ae934be | 1183 | switch (msg_user(msg)) { |
c637c103 JPM |
1184 | case TIPC_LOW_IMPORTANCE: |
1185 | case TIPC_MEDIUM_IMPORTANCE: | |
1186 | case TIPC_HIGH_IMPORTANCE: | |
1187 | case TIPC_CRITICAL_IMPORTANCE: | |
1188 | case CONN_MANAGER: | |
1189 | if (tipc_skb_queue_tail(&link->inputq, skb, dport)) { | |
1190 | node->inputq = &link->inputq; | |
1191 | node->action_flags |= TIPC_MSG_EVT; | |
7ae934be | 1192 | } |
c637c103 | 1193 | return true; |
7ae934be | 1194 | case NAME_DISTRIBUTOR: |
c637c103 JPM |
1195 | node->bclink.recv_permitted = true; |
1196 | node->namedq = &link->namedq; | |
1197 | skb_queue_tail(&link->namedq, skb); | |
1198 | if (skb_queue_len(&link->namedq) == 1) | |
1199 | node->action_flags |= TIPC_NAMED_MSG_EVT; | |
1200 | return true; | |
1201 | case MSG_BUNDLER: | |
dff29b1a | 1202 | case TUNNEL_PROTOCOL: |
c637c103 | 1203 | case MSG_FRAGMENTER: |
7ae934be | 1204 | case BCAST_PROTOCOL: |
c637c103 | 1205 | return false; |
7ae934be | 1206 | default: |
c637c103 JPM |
1207 | pr_warn("Dropping received illegal msg type\n"); |
1208 | kfree_skb(skb); | |
1209 | return false; | |
1210 | }; | |
7ae934be | 1211 | } |
c637c103 JPM |
1212 | |
1213 | /* tipc_link_input - process packet that has passed link protocol check | |
1214 | * | |
1215 | * Consumes buffer | |
1216 | * Node lock must be held | |
7ae934be | 1217 | */ |
c637c103 | 1218 | static void tipc_link_input(struct tipc_link *link, struct sk_buff *skb) |
7ae934be | 1219 | { |
c637c103 JPM |
1220 | struct tipc_node *node = link->owner; |
1221 | struct tipc_msg *msg = buf_msg(skb); | |
1222 | struct sk_buff *iskb; | |
1223 | int pos = 0; | |
1224 | ||
1225 | if (likely(tipc_data_input(link, skb))) | |
1226 | return; | |
7ae934be EH |
1227 | |
1228 | switch (msg_user(msg)) { | |
dff29b1a | 1229 | case TUNNEL_PROTOCOL: |
8b4ed863 JPM |
1230 | if (msg_dup(msg)) { |
1231 | link->flags |= LINK_SYNCHING; | |
1232 | link->synch_point = msg_seqno(msg_get_wrapped(msg)); | |
2da71425 JPM |
1233 | kfree_skb(skb); |
1234 | break; | |
8b4ed863 | 1235 | } |
dff29b1a | 1236 | if (!tipc_link_failover_rcv(link, &skb)) |
c637c103 JPM |
1237 | break; |
1238 | if (msg_user(buf_msg(skb)) != MSG_BUNDLER) { | |
1239 | tipc_data_input(link, skb); | |
1240 | break; | |
1241 | } | |
1242 | case MSG_BUNDLER: | |
1243 | link->stats.recv_bundles++; | |
1244 | link->stats.recv_bundled += msg_msgcnt(msg); | |
1245 | ||
1246 | while (tipc_msg_extract(skb, &iskb, &pos)) | |
1247 | tipc_data_input(link, iskb); | |
7ae934be | 1248 | break; |
c637c103 JPM |
1249 | case MSG_FRAGMENTER: |
1250 | link->stats.recv_fragments++; | |
1251 | if (tipc_buf_append(&link->reasm_buf, &skb)) { | |
1252 | link->stats.recv_fragmented++; | |
1253 | tipc_data_input(link, skb); | |
1254 | } else if (!link->reasm_buf) { | |
1255 | tipc_link_reset(link); | |
1256 | } | |
7ae934be | 1257 | break; |
c637c103 JPM |
1258 | case BCAST_PROTOCOL: |
1259 | tipc_link_sync_rcv(node, skb); | |
7ae934be EH |
1260 | break; |
1261 | default: | |
c637c103 JPM |
1262 | break; |
1263 | }; | |
7ae934be EH |
1264 | } |
1265 | ||
2c53040f | 1266 | /** |
8809b255 AS |
1267 | * tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue |
1268 | * | |
1269 | * Returns increase in queue length (i.e. 0 or 1) | |
b97bf3fd | 1270 | */ |
bc6fecd4 | 1271 | u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb) |
b97bf3fd | 1272 | { |
bc6fecd4 YX |
1273 | struct sk_buff *skb1; |
1274 | u32 seq_no = buf_seqno(skb); | |
b97bf3fd PL |
1275 | |
1276 | /* Empty queue ? */ | |
bc6fecd4 YX |
1277 | if (skb_queue_empty(list)) { |
1278 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1279 | return 1; |
1280 | } | |
1281 | ||
1282 | /* Last ? */ | |
bc6fecd4 YX |
1283 | if (less(buf_seqno(skb_peek_tail(list)), seq_no)) { |
1284 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1285 | return 1; |
1286 | } | |
1287 | ||
8809b255 | 1288 | /* Locate insertion point in queue, then insert; discard if duplicate */ |
bc6fecd4 YX |
1289 | skb_queue_walk(list, skb1) { |
1290 | u32 curr_seqno = buf_seqno(skb1); | |
b97bf3fd | 1291 | |
8809b255 | 1292 | if (seq_no == curr_seqno) { |
bc6fecd4 | 1293 | kfree_skb(skb); |
8809b255 | 1294 | return 0; |
b97bf3fd | 1295 | } |
8809b255 AS |
1296 | |
1297 | if (less(seq_no, curr_seqno)) | |
b97bf3fd | 1298 | break; |
8809b255 | 1299 | } |
b97bf3fd | 1300 | |
bc6fecd4 | 1301 | __skb_queue_before(list, skb1, skb); |
8809b255 | 1302 | return 1; |
b97bf3fd PL |
1303 | } |
1304 | ||
8809b255 | 1305 | /* |
b97bf3fd PL |
1306 | * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet |
1307 | */ | |
c5898636 | 1308 | static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr, |
b97bf3fd PL |
1309 | struct sk_buff *buf) |
1310 | { | |
f905730c | 1311 | u32 seq_no = buf_seqno(buf); |
b97bf3fd PL |
1312 | |
1313 | if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) { | |
c5898636 | 1314 | tipc_link_proto_rcv(l_ptr, buf); |
b97bf3fd PL |
1315 | return; |
1316 | } | |
1317 | ||
b97bf3fd | 1318 | /* Record OOS packet arrival (force mismatch on next timeout) */ |
b97bf3fd PL |
1319 | l_ptr->checkpoint--; |
1320 | ||
c4307285 | 1321 | /* |
b97bf3fd PL |
1322 | * Discard packet if a duplicate; otherwise add it to deferred queue |
1323 | * and notify peer of gap as per protocol specification | |
1324 | */ | |
b97bf3fd PL |
1325 | if (less(seq_no, mod(l_ptr->next_in_no))) { |
1326 | l_ptr->stats.duplicates++; | |
5f6d9123 | 1327 | kfree_skb(buf); |
b97bf3fd PL |
1328 | return; |
1329 | } | |
1330 | ||
05dcc5aa | 1331 | if (tipc_link_defer_pkt(&l_ptr->deferdq, buf)) { |
b97bf3fd | 1332 | l_ptr->stats.deferred_recv++; |
05dcc5aa | 1333 | if ((skb_queue_len(&l_ptr->deferdq) % TIPC_MIN_LINK_WIN) == 1) |
ed193ece | 1334 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0); |
bc6fecd4 | 1335 | } else { |
b97bf3fd | 1336 | l_ptr->stats.duplicates++; |
bc6fecd4 | 1337 | } |
b97bf3fd PL |
1338 | } |
1339 | ||
1340 | /* | |
1341 | * Send protocol message to the other endpoint. | |
1342 | */ | |
247f0f3c | 1343 | void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg, |
ed193ece | 1344 | u32 gap, u32 tolerance, u32 priority) |
b97bf3fd | 1345 | { |
1fc54d8f | 1346 | struct sk_buff *buf = NULL; |
b97bf3fd | 1347 | struct tipc_msg *msg = l_ptr->pmsg; |
c4307285 | 1348 | u32 msg_size = sizeof(l_ptr->proto_msg); |
75f0aa49 | 1349 | int r_flag; |
b97bf3fd | 1350 | |
dff29b1a JPM |
1351 | /* Don't send protocol message during link failover */ |
1352 | if (l_ptr->flags & LINK_FAILINGOVER) | |
b97bf3fd | 1353 | return; |
b4b56102 AS |
1354 | |
1355 | /* Abort non-RESET send if communication with node is prohibited */ | |
10f465c4 | 1356 | if ((tipc_node_blocked(l_ptr->owner)) && (msg_typ != RESET_MSG)) |
b4b56102 AS |
1357 | return; |
1358 | ||
92d2c905 | 1359 | /* Create protocol message with "out-of-sequence" sequence number */ |
b97bf3fd | 1360 | msg_set_type(msg, msg_typ); |
7a2f7d18 | 1361 | msg_set_net_plane(msg, l_ptr->net_plane); |
7a54d4a9 | 1362 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
1da46568 | 1363 | msg_set_last_bcast(msg, tipc_bclink_get_last_sent(l_ptr->owner->net)); |
b97bf3fd PL |
1364 | |
1365 | if (msg_typ == STATE_MSG) { | |
1366 | u32 next_sent = mod(l_ptr->next_out_no); | |
1367 | ||
4323add6 | 1368 | if (!tipc_link_is_up(l_ptr)) |
b97bf3fd | 1369 | return; |
05dcc5aa JPM |
1370 | if (skb_queue_len(&l_ptr->backlogq)) |
1371 | next_sent = buf_seqno(skb_peek(&l_ptr->backlogq)); | |
b97bf3fd | 1372 | msg_set_next_sent(msg, next_sent); |
05dcc5aa JPM |
1373 | if (!skb_queue_empty(&l_ptr->deferdq)) { |
1374 | u32 rec = buf_seqno(skb_peek(&l_ptr->deferdq)); | |
b97bf3fd PL |
1375 | gap = mod(rec - mod(l_ptr->next_in_no)); |
1376 | } | |
1377 | msg_set_seq_gap(msg, gap); | |
1378 | if (gap) | |
1379 | l_ptr->stats.sent_nacks++; | |
1380 | msg_set_link_tolerance(msg, tolerance); | |
1381 | msg_set_linkprio(msg, priority); | |
ed193ece | 1382 | msg_set_max_pkt(msg, l_ptr->mtu); |
b97bf3fd PL |
1383 | msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); |
1384 | msg_set_probe(msg, probe_msg != 0); | |
ed193ece | 1385 | if (probe_msg) |
b97bf3fd | 1386 | l_ptr->stats.sent_probes++; |
b97bf3fd PL |
1387 | l_ptr->stats.sent_states++; |
1388 | } else { /* RESET_MSG or ACTIVATE_MSG */ | |
dff29b1a | 1389 | msg_set_ack(msg, mod(l_ptr->failover_checkpt - 1)); |
b97bf3fd PL |
1390 | msg_set_seq_gap(msg, 0); |
1391 | msg_set_next_sent(msg, 1); | |
f23d9bf2 | 1392 | msg_set_probe(msg, 0); |
b97bf3fd PL |
1393 | msg_set_link_tolerance(msg, l_ptr->tolerance); |
1394 | msg_set_linkprio(msg, l_ptr->priority); | |
ed193ece | 1395 | msg_set_max_pkt(msg, l_ptr->advertised_mtu); |
b97bf3fd PL |
1396 | } |
1397 | ||
75f0aa49 AS |
1398 | r_flag = (l_ptr->owner->working_links > tipc_link_is_up(l_ptr)); |
1399 | msg_set_redundant_link(msg, r_flag); | |
b97bf3fd | 1400 | msg_set_linkprio(msg, l_ptr->priority); |
92d2c905 | 1401 | msg_set_size(msg, msg_size); |
b97bf3fd PL |
1402 | |
1403 | msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2))); | |
1404 | ||
31e3c3f6 | 1405 | buf = tipc_buf_acquire(msg_size); |
b97bf3fd PL |
1406 | if (!buf) |
1407 | return; | |
1408 | ||
27d7ff46 | 1409 | skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg)); |
796c75d0 | 1410 | buf->priority = TC_PRIO_CONTROL; |
7f9f95d9 YX |
1411 | tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, buf, |
1412 | &l_ptr->media_addr); | |
05dcc5aa | 1413 | l_ptr->rcv_unacked = 0; |
5f6d9123 | 1414 | kfree_skb(buf); |
b97bf3fd PL |
1415 | } |
1416 | ||
1417 | /* | |
1418 | * Receive protocol message : | |
c4307285 YH |
1419 | * Note that network plane id propagates through the network, and may |
1420 | * change at any time. The node with lowest address rules | |
b97bf3fd | 1421 | */ |
c5898636 | 1422 | static void tipc_link_proto_rcv(struct tipc_link *l_ptr, |
c93d3baa | 1423 | struct sk_buff *buf) |
b97bf3fd PL |
1424 | { |
1425 | u32 rec_gap = 0; | |
b97bf3fd PL |
1426 | u32 msg_tol; |
1427 | struct tipc_msg *msg = buf_msg(buf); | |
1428 | ||
dff29b1a | 1429 | if (l_ptr->flags & LINK_FAILINGOVER) |
b97bf3fd PL |
1430 | goto exit; |
1431 | ||
7a2f7d18 | 1432 | if (l_ptr->net_plane != msg_net_plane(msg)) |
c5898636 | 1433 | if (link_own_addr(l_ptr) > msg_prevnode(msg)) |
7a2f7d18 | 1434 | l_ptr->net_plane = msg_net_plane(msg); |
b97bf3fd | 1435 | |
b97bf3fd | 1436 | switch (msg_type(msg)) { |
c4307285 | 1437 | |
b97bf3fd | 1438 | case RESET_MSG: |
a686e685 AS |
1439 | if (!link_working_unknown(l_ptr) && |
1440 | (l_ptr->peer_session != INVALID_SESSION)) { | |
641c218d AS |
1441 | if (less_eq(msg_session(msg), l_ptr->peer_session)) |
1442 | break; /* duplicate or old reset: ignore */ | |
b97bf3fd | 1443 | } |
b4b56102 AS |
1444 | |
1445 | if (!msg_redundant_link(msg) && (link_working_working(l_ptr) || | |
1446 | link_working_unknown(l_ptr))) { | |
1447 | /* | |
1448 | * peer has lost contact -- don't allow peer's links | |
1449 | * to reactivate before we recognize loss & clean up | |
1450 | */ | |
ca9cf06a | 1451 | l_ptr->owner->action_flags |= TIPC_WAIT_OWN_LINKS_DOWN; |
b4b56102 AS |
1452 | } |
1453 | ||
47361c87 AS |
1454 | link_state_event(l_ptr, RESET_MSG); |
1455 | ||
b97bf3fd PL |
1456 | /* fall thru' */ |
1457 | case ACTIVATE_MSG: | |
1458 | /* Update link settings according other endpoint's values */ | |
b97bf3fd PL |
1459 | strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg)); |
1460 | ||
2db9983a AS |
1461 | msg_tol = msg_link_tolerance(msg); |
1462 | if (msg_tol > l_ptr->tolerance) | |
b97bf3fd PL |
1463 | link_set_supervision_props(l_ptr, msg_tol); |
1464 | ||
1465 | if (msg_linkprio(msg) > l_ptr->priority) | |
1466 | l_ptr->priority = msg_linkprio(msg); | |
1467 | ||
ed193ece JPM |
1468 | if (l_ptr->mtu > msg_max_pkt(msg)) |
1469 | l_ptr->mtu = msg_max_pkt(msg); | |
b97bf3fd | 1470 | |
4d75313c | 1471 | /* Synchronize broadcast link info, if not done previously */ |
7a54d4a9 AS |
1472 | if (!tipc_node_is_up(l_ptr->owner)) { |
1473 | l_ptr->owner->bclink.last_sent = | |
1474 | l_ptr->owner->bclink.last_in = | |
1475 | msg_last_bcast(msg); | |
1476 | l_ptr->owner->bclink.oos_state = 0; | |
1477 | } | |
4d75313c | 1478 | |
b97bf3fd PL |
1479 | l_ptr->peer_session = msg_session(msg); |
1480 | l_ptr->peer_bearer_id = msg_bearer_id(msg); | |
47361c87 AS |
1481 | |
1482 | if (msg_type(msg) == ACTIVATE_MSG) | |
1483 | link_state_event(l_ptr, ACTIVATE_MSG); | |
b97bf3fd PL |
1484 | break; |
1485 | case STATE_MSG: | |
1486 | ||
2db9983a AS |
1487 | msg_tol = msg_link_tolerance(msg); |
1488 | if (msg_tol) | |
b97bf3fd | 1489 | link_set_supervision_props(l_ptr, msg_tol); |
c4307285 YH |
1490 | |
1491 | if (msg_linkprio(msg) && | |
b97bf3fd | 1492 | (msg_linkprio(msg) != l_ptr->priority)) { |
3fa9cacd EH |
1493 | pr_debug("%s<%s>, priority change %u->%u\n", |
1494 | link_rst_msg, l_ptr->name, | |
1495 | l_ptr->priority, msg_linkprio(msg)); | |
b97bf3fd | 1496 | l_ptr->priority = msg_linkprio(msg); |
4323add6 | 1497 | tipc_link_reset(l_ptr); /* Enforce change to take effect */ |
b97bf3fd PL |
1498 | break; |
1499 | } | |
ec37dcd3 JPM |
1500 | |
1501 | /* Record reception; force mismatch at next timeout: */ | |
1502 | l_ptr->checkpoint--; | |
1503 | ||
b97bf3fd PL |
1504 | link_state_event(l_ptr, TRAFFIC_MSG_EVT); |
1505 | l_ptr->stats.recv_states++; | |
1506 | if (link_reset_unknown(l_ptr)) | |
1507 | break; | |
1508 | ||
1509 | if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) { | |
c4307285 | 1510 | rec_gap = mod(msg_next_sent(msg) - |
b97bf3fd PL |
1511 | mod(l_ptr->next_in_no)); |
1512 | } | |
1513 | ||
ed193ece | 1514 | if (msg_probe(msg)) |
b97bf3fd | 1515 | l_ptr->stats.recv_probes++; |
b97bf3fd PL |
1516 | |
1517 | /* Protocol message before retransmits, reduce loss risk */ | |
389dd9bc | 1518 | if (l_ptr->owner->bclink.recv_permitted) |
c5898636 | 1519 | tipc_bclink_update_link_state(l_ptr->owner, |
7a54d4a9 | 1520 | msg_last_bcast(msg)); |
b97bf3fd PL |
1521 | |
1522 | if (rec_gap || (msg_probe(msg))) { | |
ed193ece JPM |
1523 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, |
1524 | rec_gap, 0, 0); | |
b97bf3fd PL |
1525 | } |
1526 | if (msg_seq_gap(msg)) { | |
b97bf3fd | 1527 | l_ptr->stats.recv_nacks++; |
05dcc5aa | 1528 | tipc_link_retransmit(l_ptr, skb_peek(&l_ptr->transmq), |
4323add6 | 1529 | msg_seq_gap(msg)); |
b97bf3fd PL |
1530 | } |
1531 | break; | |
b97bf3fd PL |
1532 | } |
1533 | exit: | |
5f6d9123 | 1534 | kfree_skb(buf); |
b97bf3fd PL |
1535 | } |
1536 | ||
1537 | ||
170b3927 JPM |
1538 | /* tipc_link_tunnel_xmit(): Tunnel one packet via a link belonging to |
1539 | * a different bearer. Owner node is locked. | |
b97bf3fd | 1540 | */ |
170b3927 JPM |
1541 | static void tipc_link_tunnel_xmit(struct tipc_link *l_ptr, |
1542 | struct tipc_msg *tunnel_hdr, | |
1543 | struct tipc_msg *msg, | |
1544 | u32 selector) | |
b97bf3fd | 1545 | { |
a18c4bc3 | 1546 | struct tipc_link *tunnel; |
a6ca1094 | 1547 | struct sk_buff *skb; |
b97bf3fd PL |
1548 | u32 length = msg_size(msg); |
1549 | ||
1550 | tunnel = l_ptr->owner->active_links[selector & 1]; | |
5392d646 | 1551 | if (!tipc_link_is_up(tunnel)) { |
2cf8aa19 | 1552 | pr_warn("%stunnel link no longer available\n", link_co_err); |
b97bf3fd | 1553 | return; |
5392d646 | 1554 | } |
b97bf3fd | 1555 | msg_set_size(tunnel_hdr, length + INT_H_SIZE); |
a6ca1094 YX |
1556 | skb = tipc_buf_acquire(length + INT_H_SIZE); |
1557 | if (!skb) { | |
2cf8aa19 | 1558 | pr_warn("%sunable to send tunnel msg\n", link_co_err); |
b97bf3fd | 1559 | return; |
5392d646 | 1560 | } |
a6ca1094 YX |
1561 | skb_copy_to_linear_data(skb, tunnel_hdr, INT_H_SIZE); |
1562 | skb_copy_to_linear_data_offset(skb, INT_H_SIZE, msg, length); | |
1563 | __tipc_link_xmit_skb(tunnel, skb); | |
b97bf3fd PL |
1564 | } |
1565 | ||
1566 | ||
170b3927 JPM |
1567 | /* tipc_link_failover_send_queue(): A link has gone down, but a second |
1568 | * link is still active. We can do failover. Tunnel the failing link's | |
1569 | * whole send queue via the remaining link. This way, we don't lose | |
1570 | * any packets, and sequence order is preserved for subsequent traffic | |
1571 | * sent over the remaining link. Owner node is locked. | |
b97bf3fd | 1572 | */ |
170b3927 | 1573 | void tipc_link_failover_send_queue(struct tipc_link *l_ptr) |
b97bf3fd | 1574 | { |
05dcc5aa | 1575 | int msgcount; |
a18c4bc3 | 1576 | struct tipc_link *tunnel = l_ptr->owner->active_links[0]; |
b97bf3fd | 1577 | struct tipc_msg tunnel_hdr; |
58dc55f2 | 1578 | struct sk_buff *skb; |
5392d646 | 1579 | int split_bundles; |
b97bf3fd PL |
1580 | |
1581 | if (!tunnel) | |
1582 | return; | |
1583 | ||
dff29b1a JPM |
1584 | tipc_msg_init(link_own_addr(l_ptr), &tunnel_hdr, TUNNEL_PROTOCOL, |
1585 | FAILOVER_MSG, INT_H_SIZE, l_ptr->addr); | |
05dcc5aa | 1586 | skb_queue_splice_tail_init(&l_ptr->backlogq, &l_ptr->transmq); |
1f66d161 | 1587 | tipc_link_purge_backlog(l_ptr); |
05dcc5aa | 1588 | msgcount = skb_queue_len(&l_ptr->transmq); |
b97bf3fd PL |
1589 | msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id); |
1590 | msg_set_msgcnt(&tunnel_hdr, msgcount); | |
f131072c | 1591 | |
05dcc5aa | 1592 | if (skb_queue_empty(&l_ptr->transmq)) { |
58dc55f2 YX |
1593 | skb = tipc_buf_acquire(INT_H_SIZE); |
1594 | if (skb) { | |
1595 | skb_copy_to_linear_data(skb, &tunnel_hdr, INT_H_SIZE); | |
b97bf3fd | 1596 | msg_set_size(&tunnel_hdr, INT_H_SIZE); |
a6ca1094 | 1597 | __tipc_link_xmit_skb(tunnel, skb); |
b97bf3fd | 1598 | } else { |
2cf8aa19 EH |
1599 | pr_warn("%sunable to send changeover msg\n", |
1600 | link_co_err); | |
b97bf3fd PL |
1601 | } |
1602 | return; | |
1603 | } | |
f131072c | 1604 | |
c4307285 | 1605 | split_bundles = (l_ptr->owner->active_links[0] != |
5392d646 AS |
1606 | l_ptr->owner->active_links[1]); |
1607 | ||
05dcc5aa | 1608 | skb_queue_walk(&l_ptr->transmq, skb) { |
58dc55f2 | 1609 | struct tipc_msg *msg = buf_msg(skb); |
b97bf3fd PL |
1610 | |
1611 | if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) { | |
b97bf3fd | 1612 | struct tipc_msg *m = msg_get_wrapped(msg); |
0e65967e | 1613 | unchar *pos = (unchar *)m; |
b97bf3fd | 1614 | |
d788d805 | 1615 | msgcount = msg_msgcnt(msg); |
b97bf3fd | 1616 | while (msgcount--) { |
0e65967e | 1617 | msg_set_seqno(m, msg_seqno(msg)); |
170b3927 JPM |
1618 | tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, m, |
1619 | msg_link_selector(m)); | |
b97bf3fd PL |
1620 | pos += align(msg_size(m)); |
1621 | m = (struct tipc_msg *)pos; | |
1622 | } | |
1623 | } else { | |
170b3927 JPM |
1624 | tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, msg, |
1625 | msg_link_selector(msg)); | |
b97bf3fd | 1626 | } |
b97bf3fd PL |
1627 | } |
1628 | } | |
1629 | ||
247f0f3c | 1630 | /* tipc_link_dup_queue_xmit(): A second link has become active. Tunnel a |
170b3927 JPM |
1631 | * duplicate of the first link's send queue via the new link. This way, we |
1632 | * are guaranteed that currently queued packets from a socket are delivered | |
1633 | * before future traffic from the same socket, even if this is using the | |
1634 | * new link. The last arriving copy of each duplicate packet is dropped at | |
1635 | * the receiving end by the regular protocol check, so packet cardinality | |
1636 | * and sequence order is preserved per sender/receiver socket pair. | |
1637 | * Owner node is locked. | |
1638 | */ | |
05dcc5aa JPM |
1639 | void tipc_link_dup_queue_xmit(struct tipc_link *link, |
1640 | struct tipc_link *tnl) | |
b97bf3fd | 1641 | { |
58dc55f2 | 1642 | struct sk_buff *skb; |
05dcc5aa JPM |
1643 | struct tipc_msg tnl_hdr; |
1644 | struct sk_buff_head *queue = &link->transmq; | |
1645 | int mcnt; | |
1646 | ||
dff29b1a JPM |
1647 | tipc_msg_init(link_own_addr(link), &tnl_hdr, TUNNEL_PROTOCOL, |
1648 | SYNCH_MSG, INT_H_SIZE, link->addr); | |
05dcc5aa JPM |
1649 | mcnt = skb_queue_len(&link->transmq) + skb_queue_len(&link->backlogq); |
1650 | msg_set_msgcnt(&tnl_hdr, mcnt); | |
1651 | msg_set_bearer_id(&tnl_hdr, link->peer_bearer_id); | |
1652 | ||
1653 | tunnel_queue: | |
1654 | skb_queue_walk(queue, skb) { | |
58dc55f2 YX |
1655 | struct sk_buff *outskb; |
1656 | struct tipc_msg *msg = buf_msg(skb); | |
05dcc5aa | 1657 | u32 len = msg_size(msg); |
b97bf3fd | 1658 | |
05dcc5aa JPM |
1659 | msg_set_ack(msg, mod(link->next_in_no - 1)); |
1660 | msg_set_bcast_ack(msg, link->owner->bclink.last_in); | |
1661 | msg_set_size(&tnl_hdr, len + INT_H_SIZE); | |
1662 | outskb = tipc_buf_acquire(len + INT_H_SIZE); | |
58dc55f2 | 1663 | if (outskb == NULL) { |
2cf8aa19 EH |
1664 | pr_warn("%sunable to send duplicate msg\n", |
1665 | link_co_err); | |
b97bf3fd PL |
1666 | return; |
1667 | } | |
05dcc5aa JPM |
1668 | skb_copy_to_linear_data(outskb, &tnl_hdr, INT_H_SIZE); |
1669 | skb_copy_to_linear_data_offset(outskb, INT_H_SIZE, | |
1670 | skb->data, len); | |
1671 | __tipc_link_xmit_skb(tnl, outskb); | |
1672 | if (!tipc_link_is_up(link)) | |
b97bf3fd | 1673 | return; |
b97bf3fd | 1674 | } |
05dcc5aa JPM |
1675 | if (queue == &link->backlogq) |
1676 | return; | |
1677 | queue = &link->backlogq; | |
1678 | goto tunnel_queue; | |
b97bf3fd PL |
1679 | } |
1680 | ||
dff29b1a | 1681 | /* tipc_link_failover_rcv(): Receive a tunnelled FAILOVER_MSG packet |
f006c9c7 JPM |
1682 | * Owner node is locked. |
1683 | */ | |
dff29b1a | 1684 | static bool tipc_link_failover_rcv(struct tipc_link *link, |
2da71425 | 1685 | struct sk_buff **skb) |
f006c9c7 | 1686 | { |
2da71425 JPM |
1687 | struct tipc_msg *msg = buf_msg(*skb); |
1688 | struct sk_buff *iskb = NULL; | |
dff29b1a | 1689 | struct tipc_link *pl = NULL; |
2da71425 | 1690 | int bearer_id = msg_bearer_id(msg); |
c1336ee4 | 1691 | int pos = 0; |
f006c9c7 | 1692 | |
dff29b1a | 1693 | if (msg_type(msg) != FAILOVER_MSG) { |
2da71425 JPM |
1694 | pr_warn("%sunknown tunnel pkt received\n", link_co_err); |
1695 | goto exit; | |
f006c9c7 | 1696 | } |
2da71425 JPM |
1697 | if (bearer_id >= MAX_BEARERS) |
1698 | goto exit; | |
dff29b1a JPM |
1699 | |
1700 | if (bearer_id == link->bearer_id) | |
2da71425 | 1701 | goto exit; |
b97bf3fd | 1702 | |
dff29b1a JPM |
1703 | pl = link->owner->links[bearer_id]; |
1704 | if (pl && tipc_link_is_up(pl)) | |
1705 | tipc_link_reset(pl); | |
1706 | ||
1707 | if (link->failover_pkts == FIRST_FAILOVER) | |
1708 | link->failover_pkts = msg_msgcnt(msg); | |
1e9d47a9 | 1709 | |
2da71425 | 1710 | /* Should we expect an inner packet? */ |
dff29b1a | 1711 | if (!link->failover_pkts) |
cb4b102f | 1712 | goto exit; |
1dab3d5a | 1713 | |
2da71425 JPM |
1714 | if (!tipc_msg_extract(*skb, &iskb, &pos)) { |
1715 | pr_warn("%sno inner failover pkt\n", link_co_err); | |
1716 | *skb = NULL; | |
b97bf3fd | 1717 | goto exit; |
2da71425 | 1718 | } |
dff29b1a | 1719 | link->failover_pkts--; |
2da71425 | 1720 | *skb = NULL; |
b97bf3fd | 1721 | |
dff29b1a JPM |
1722 | /* Was this packet already delivered? */ |
1723 | if (less(buf_seqno(iskb), link->failover_checkpt)) { | |
2da71425 JPM |
1724 | kfree_skb(iskb); |
1725 | iskb = NULL; | |
1726 | goto exit; | |
1727 | } | |
1728 | if (msg_user(buf_msg(iskb)) == MSG_FRAGMENTER) { | |
1729 | link->stats.recv_fragments++; | |
dff29b1a | 1730 | tipc_buf_append(&link->failover_skb, &iskb); |
2da71425 | 1731 | } |
b97bf3fd | 1732 | exit: |
dff29b1a JPM |
1733 | if (!link->failover_pkts && pl) |
1734 | pl->flags &= ~LINK_FAILINGOVER; | |
2da71425 JPM |
1735 | kfree_skb(*skb); |
1736 | *skb = iskb; | |
1737 | return *skb; | |
b97bf3fd PL |
1738 | } |
1739 | ||
2f55c437 | 1740 | static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol) |
b97bf3fd | 1741 | { |
2f55c437 YX |
1742 | unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4; |
1743 | ||
1744 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
5413b4c6 AS |
1745 | return; |
1746 | ||
2f55c437 YX |
1747 | l_ptr->tolerance = tol; |
1748 | l_ptr->cont_intv = msecs_to_jiffies(intv); | |
1749 | l_ptr->abort_limit = tol / (jiffies_to_msecs(l_ptr->cont_intv) / 4); | |
b97bf3fd PL |
1750 | } |
1751 | ||
e3eea1eb | 1752 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
b97bf3fd | 1753 | { |
ed193ece | 1754 | int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE); |
e3eea1eb JPM |
1755 | |
1756 | l->window = win; | |
1f66d161 JPM |
1757 | l->backlog[TIPC_LOW_IMPORTANCE].limit = win / 2; |
1758 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = win; | |
1759 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = win / 2 * 3; | |
1760 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = win * 2; | |
1761 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; | |
b97bf3fd PL |
1762 | } |
1763 | ||
e099e86c | 1764 | /* tipc_link_find_owner - locate owner node of link by link's name |
f2f9800d | 1765 | * @net: the applicable net namespace |
e099e86c JPM |
1766 | * @name: pointer to link name string |
1767 | * @bearer_id: pointer to index in 'node->links' array where the link was found. | |
c4307285 | 1768 | * |
e099e86c | 1769 | * Returns pointer to node owning the link, or 0 if no matching link is found. |
b97bf3fd | 1770 | */ |
f2f9800d YX |
1771 | static struct tipc_node *tipc_link_find_owner(struct net *net, |
1772 | const char *link_name, | |
e099e86c | 1773 | unsigned int *bearer_id) |
b97bf3fd | 1774 | { |
f2f9800d | 1775 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
a18c4bc3 | 1776 | struct tipc_link *l_ptr; |
bbfbe47c | 1777 | struct tipc_node *n_ptr; |
886eaa1f | 1778 | struct tipc_node *found_node = NULL; |
bbfbe47c | 1779 | int i; |
b97bf3fd | 1780 | |
e099e86c | 1781 | *bearer_id = 0; |
6c7a762e | 1782 | rcu_read_lock(); |
f2f9800d | 1783 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
a11607f5 | 1784 | tipc_node_lock(n_ptr); |
bbfbe47c EH |
1785 | for (i = 0; i < MAX_BEARERS; i++) { |
1786 | l_ptr = n_ptr->links[i]; | |
e099e86c JPM |
1787 | if (l_ptr && !strcmp(l_ptr->name, link_name)) { |
1788 | *bearer_id = i; | |
1789 | found_node = n_ptr; | |
1790 | break; | |
1791 | } | |
bbfbe47c | 1792 | } |
a11607f5 | 1793 | tipc_node_unlock(n_ptr); |
e099e86c JPM |
1794 | if (found_node) |
1795 | break; | |
bbfbe47c | 1796 | } |
6c7a762e YX |
1797 | rcu_read_unlock(); |
1798 | ||
e099e86c | 1799 | return found_node; |
b97bf3fd PL |
1800 | } |
1801 | ||
b97bf3fd PL |
1802 | /** |
1803 | * link_reset_statistics - reset link statistics | |
1804 | * @l_ptr: pointer to link | |
1805 | */ | |
a18c4bc3 | 1806 | static void link_reset_statistics(struct tipc_link *l_ptr) |
b97bf3fd PL |
1807 | { |
1808 | memset(&l_ptr->stats, 0, sizeof(l_ptr->stats)); | |
1809 | l_ptr->stats.sent_info = l_ptr->next_out_no; | |
1810 | l_ptr->stats.recv_info = l_ptr->next_in_no; | |
1811 | } | |
1812 | ||
a18c4bc3 | 1813 | static void link_print(struct tipc_link *l_ptr, const char *str) |
b97bf3fd | 1814 | { |
7f9f95d9 | 1815 | struct tipc_net *tn = net_generic(l_ptr->owner->net, tipc_net_id); |
7a2f7d18 YX |
1816 | struct tipc_bearer *b_ptr; |
1817 | ||
1818 | rcu_read_lock(); | |
7f9f95d9 | 1819 | b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]); |
7a2f7d18 YX |
1820 | if (b_ptr) |
1821 | pr_info("%s Link %x<%s>:", str, l_ptr->addr, b_ptr->name); | |
1822 | rcu_read_unlock(); | |
8d64a5ba | 1823 | |
b97bf3fd | 1824 | if (link_working_unknown(l_ptr)) |
5deedde9 | 1825 | pr_cont(":WU\n"); |
8d64a5ba | 1826 | else if (link_reset_reset(l_ptr)) |
5deedde9 | 1827 | pr_cont(":RR\n"); |
8d64a5ba | 1828 | else if (link_reset_unknown(l_ptr)) |
5deedde9 | 1829 | pr_cont(":RU\n"); |
8d64a5ba | 1830 | else if (link_working_working(l_ptr)) |
5deedde9 PG |
1831 | pr_cont(":WW\n"); |
1832 | else | |
1833 | pr_cont("\n"); | |
b97bf3fd | 1834 | } |
0655f6a8 RA |
1835 | |
1836 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
1837 | */ | |
1838 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
1839 | { | |
1840 | int err; | |
1841 | ||
1842 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
1843 | tipc_nl_prop_policy); | |
1844 | if (err) | |
1845 | return err; | |
1846 | ||
1847 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1848 | u32 prio; | |
1849 | ||
1850 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1851 | if (prio > TIPC_MAX_LINK_PRI) | |
1852 | return -EINVAL; | |
1853 | } | |
1854 | ||
1855 | if (props[TIPC_NLA_PROP_TOL]) { | |
1856 | u32 tol; | |
1857 | ||
1858 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1859 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
1860 | return -EINVAL; | |
1861 | } | |
1862 | ||
1863 | if (props[TIPC_NLA_PROP_WIN]) { | |
1864 | u32 win; | |
1865 | ||
1866 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1867 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
1868 | return -EINVAL; | |
1869 | } | |
1870 | ||
1871 | return 0; | |
1872 | } | |
7be57fc6 | 1873 | |
f96ce7a2 RA |
1874 | int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info) |
1875 | { | |
1876 | int err; | |
1877 | int res = 0; | |
1878 | int bearer_id; | |
1879 | char *name; | |
1880 | struct tipc_link *link; | |
1881 | struct tipc_node *node; | |
1882 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
37e2d484 | 1883 | struct net *net = sock_net(skb->sk); |
f96ce7a2 RA |
1884 | |
1885 | if (!info->attrs[TIPC_NLA_LINK]) | |
1886 | return -EINVAL; | |
1887 | ||
1888 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
1889 | info->attrs[TIPC_NLA_LINK], | |
1890 | tipc_nl_link_policy); | |
1891 | if (err) | |
1892 | return err; | |
1893 | ||
1894 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
1895 | return -EINVAL; | |
1896 | ||
1897 | name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
1898 | ||
f2f9800d | 1899 | node = tipc_link_find_owner(net, name, &bearer_id); |
f96ce7a2 RA |
1900 | if (!node) |
1901 | return -EINVAL; | |
1902 | ||
1903 | tipc_node_lock(node); | |
1904 | ||
1905 | link = node->links[bearer_id]; | |
1906 | if (!link) { | |
1907 | res = -EINVAL; | |
1908 | goto out; | |
1909 | } | |
1910 | ||
1911 | if (attrs[TIPC_NLA_LINK_PROP]) { | |
1912 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; | |
1913 | ||
1914 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], | |
1915 | props); | |
1916 | if (err) { | |
1917 | res = err; | |
1918 | goto out; | |
1919 | } | |
1920 | ||
1921 | if (props[TIPC_NLA_PROP_TOL]) { | |
1922 | u32 tol; | |
1923 | ||
1924 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1925 | link_set_supervision_props(link, tol); | |
ed193ece | 1926 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0); |
f96ce7a2 RA |
1927 | } |
1928 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1929 | u32 prio; | |
1930 | ||
1931 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1932 | link->priority = prio; | |
ed193ece | 1933 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio); |
f96ce7a2 RA |
1934 | } |
1935 | if (props[TIPC_NLA_PROP_WIN]) { | |
1936 | u32 win; | |
1937 | ||
1938 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1939 | tipc_link_set_queue_limits(link, win); | |
1940 | } | |
1941 | } | |
1942 | ||
1943 | out: | |
1944 | tipc_node_unlock(node); | |
1945 | ||
1946 | return res; | |
1947 | } | |
d8182804 RA |
1948 | |
1949 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) | |
7be57fc6 RA |
1950 | { |
1951 | int i; | |
1952 | struct nlattr *stats; | |
1953 | ||
1954 | struct nla_map { | |
1955 | u32 key; | |
1956 | u32 val; | |
1957 | }; | |
1958 | ||
1959 | struct nla_map map[] = { | |
1960 | {TIPC_NLA_STATS_RX_INFO, s->recv_info}, | |
1961 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, | |
1962 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
1963 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
1964 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
1965 | {TIPC_NLA_STATS_TX_INFO, s->sent_info}, | |
1966 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, | |
1967 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
1968 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
1969 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
1970 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
1971 | s->msg_length_counts : 1}, | |
1972 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
1973 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
1974 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
1975 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
1976 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
1977 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
1978 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
1979 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
1980 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
1981 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
1982 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
1983 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
1984 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
1985 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
1986 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
1987 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
1988 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
1989 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
1990 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
1991 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
1992 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
1993 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
1994 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
1995 | }; | |
1996 | ||
1997 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
1998 | if (!stats) | |
1999 | return -EMSGSIZE; | |
2000 | ||
2001 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
2002 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
2003 | goto msg_full; | |
2004 | ||
2005 | nla_nest_end(skb, stats); | |
2006 | ||
2007 | return 0; | |
2008 | msg_full: | |
2009 | nla_nest_cancel(skb, stats); | |
2010 | ||
2011 | return -EMSGSIZE; | |
2012 | } | |
2013 | ||
2014 | /* Caller should hold appropriate locks to protect the link */ | |
34747539 YX |
2015 | static int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
2016 | struct tipc_link *link) | |
7be57fc6 RA |
2017 | { |
2018 | int err; | |
2019 | void *hdr; | |
2020 | struct nlattr *attrs; | |
2021 | struct nlattr *prop; | |
34747539 | 2022 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
7be57fc6 | 2023 | |
bfb3e5dd | 2024 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
7be57fc6 RA |
2025 | NLM_F_MULTI, TIPC_NL_LINK_GET); |
2026 | if (!hdr) | |
2027 | return -EMSGSIZE; | |
2028 | ||
2029 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
2030 | if (!attrs) | |
2031 | goto msg_full; | |
2032 | ||
2033 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
2034 | goto attr_msg_full; | |
2035 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, | |
34747539 | 2036 | tipc_cluster_mask(tn->own_addr))) |
7be57fc6 | 2037 | goto attr_msg_full; |
ed193ece | 2038 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
7be57fc6 RA |
2039 | goto attr_msg_full; |
2040 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->next_in_no)) | |
2041 | goto attr_msg_full; | |
2042 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->next_out_no)) | |
2043 | goto attr_msg_full; | |
2044 | ||
2045 | if (tipc_link_is_up(link)) | |
2046 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2047 | goto attr_msg_full; | |
2048 | if (tipc_link_is_active(link)) | |
2049 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) | |
2050 | goto attr_msg_full; | |
2051 | ||
2052 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
2053 | if (!prop) | |
2054 | goto attr_msg_full; | |
2055 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2056 | goto prop_msg_full; | |
2057 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
2058 | goto prop_msg_full; | |
2059 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 2060 | link->window)) |
7be57fc6 RA |
2061 | goto prop_msg_full; |
2062 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2063 | goto prop_msg_full; | |
2064 | nla_nest_end(msg->skb, prop); | |
2065 | ||
2066 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
2067 | if (err) | |
2068 | goto attr_msg_full; | |
2069 | ||
2070 | nla_nest_end(msg->skb, attrs); | |
2071 | genlmsg_end(msg->skb, hdr); | |
2072 | ||
2073 | return 0; | |
2074 | ||
2075 | prop_msg_full: | |
2076 | nla_nest_cancel(msg->skb, prop); | |
2077 | attr_msg_full: | |
2078 | nla_nest_cancel(msg->skb, attrs); | |
2079 | msg_full: | |
2080 | genlmsg_cancel(msg->skb, hdr); | |
2081 | ||
2082 | return -EMSGSIZE; | |
2083 | } | |
2084 | ||
2085 | /* Caller should hold node lock */ | |
34747539 YX |
2086 | static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg, |
2087 | struct tipc_node *node, u32 *prev_link) | |
7be57fc6 RA |
2088 | { |
2089 | u32 i; | |
2090 | int err; | |
2091 | ||
2092 | for (i = *prev_link; i < MAX_BEARERS; i++) { | |
2093 | *prev_link = i; | |
2094 | ||
2095 | if (!node->links[i]) | |
2096 | continue; | |
2097 | ||
34747539 | 2098 | err = __tipc_nl_add_link(net, msg, node->links[i]); |
7be57fc6 RA |
2099 | if (err) |
2100 | return err; | |
2101 | } | |
2102 | *prev_link = 0; | |
2103 | ||
2104 | return 0; | |
2105 | } | |
2106 | ||
2107 | int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2108 | { | |
f2f9800d YX |
2109 | struct net *net = sock_net(skb->sk); |
2110 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
7be57fc6 RA |
2111 | struct tipc_node *node; |
2112 | struct tipc_nl_msg msg; | |
2113 | u32 prev_node = cb->args[0]; | |
2114 | u32 prev_link = cb->args[1]; | |
2115 | int done = cb->args[2]; | |
2116 | int err; | |
2117 | ||
2118 | if (done) | |
2119 | return 0; | |
2120 | ||
2121 | msg.skb = skb; | |
2122 | msg.portid = NETLINK_CB(cb->skb).portid; | |
2123 | msg.seq = cb->nlh->nlmsg_seq; | |
2124 | ||
2125 | rcu_read_lock(); | |
7be57fc6 | 2126 | if (prev_node) { |
f2f9800d | 2127 | node = tipc_node_find(net, prev_node); |
7be57fc6 RA |
2128 | if (!node) { |
2129 | /* We never set seq or call nl_dump_check_consistent() | |
2130 | * this means that setting prev_seq here will cause the | |
2131 | * consistence check to fail in the netlink callback | |
2132 | * handler. Resulting in the last NLMSG_DONE message | |
2133 | * having the NLM_F_DUMP_INTR flag set. | |
2134 | */ | |
2135 | cb->prev_seq = 1; | |
2136 | goto out; | |
2137 | } | |
8a0f6ebe | 2138 | tipc_node_put(node); |
7be57fc6 | 2139 | |
f2f9800d YX |
2140 | list_for_each_entry_continue_rcu(node, &tn->node_list, |
2141 | list) { | |
7be57fc6 | 2142 | tipc_node_lock(node); |
34747539 YX |
2143 | err = __tipc_nl_add_node_links(net, &msg, node, |
2144 | &prev_link); | |
7be57fc6 | 2145 | tipc_node_unlock(node); |
8a0f6ebe | 2146 | tipc_node_put(node); |
7be57fc6 RA |
2147 | if (err) |
2148 | goto out; | |
2149 | ||
2150 | prev_node = node->addr; | |
2151 | } | |
2152 | } else { | |
1da46568 | 2153 | err = tipc_nl_add_bc_link(net, &msg); |
7be57fc6 RA |
2154 | if (err) |
2155 | goto out; | |
2156 | ||
f2f9800d | 2157 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
7be57fc6 | 2158 | tipc_node_lock(node); |
34747539 YX |
2159 | err = __tipc_nl_add_node_links(net, &msg, node, |
2160 | &prev_link); | |
7be57fc6 RA |
2161 | tipc_node_unlock(node); |
2162 | if (err) | |
2163 | goto out; | |
2164 | ||
2165 | prev_node = node->addr; | |
2166 | } | |
2167 | } | |
2168 | done = 1; | |
2169 | out: | |
2170 | rcu_read_unlock(); | |
2171 | ||
2172 | cb->args[0] = prev_node; | |
2173 | cb->args[1] = prev_link; | |
2174 | cb->args[2] = done; | |
2175 | ||
2176 | return skb->len; | |
2177 | } | |
2178 | ||
2179 | int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info) | |
2180 | { | |
f2f9800d | 2181 | struct net *net = genl_info_net(info); |
7be57fc6 RA |
2182 | struct sk_buff *ans_skb; |
2183 | struct tipc_nl_msg msg; | |
2184 | struct tipc_link *link; | |
2185 | struct tipc_node *node; | |
2186 | char *name; | |
2187 | int bearer_id; | |
2188 | int err; | |
2189 | ||
2190 | if (!info->attrs[TIPC_NLA_LINK_NAME]) | |
2191 | return -EINVAL; | |
2192 | ||
2193 | name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]); | |
f2f9800d | 2194 | node = tipc_link_find_owner(net, name, &bearer_id); |
7be57fc6 RA |
2195 | if (!node) |
2196 | return -EINVAL; | |
2197 | ||
2198 | ans_skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
2199 | if (!ans_skb) | |
2200 | return -ENOMEM; | |
2201 | ||
2202 | msg.skb = ans_skb; | |
2203 | msg.portid = info->snd_portid; | |
2204 | msg.seq = info->snd_seq; | |
2205 | ||
2206 | tipc_node_lock(node); | |
2207 | link = node->links[bearer_id]; | |
2208 | if (!link) { | |
2209 | err = -EINVAL; | |
2210 | goto err_out; | |
2211 | } | |
2212 | ||
34747539 | 2213 | err = __tipc_nl_add_link(net, &msg, link); |
7be57fc6 RA |
2214 | if (err) |
2215 | goto err_out; | |
2216 | ||
2217 | tipc_node_unlock(node); | |
2218 | ||
2219 | return genlmsg_reply(ans_skb, info); | |
2220 | ||
2221 | err_out: | |
2222 | tipc_node_unlock(node); | |
2223 | nlmsg_free(ans_skb); | |
2224 | ||
2225 | return err; | |
2226 | } | |
ae36342b RA |
2227 | |
2228 | int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info) | |
2229 | { | |
2230 | int err; | |
2231 | char *link_name; | |
2232 | unsigned int bearer_id; | |
2233 | struct tipc_link *link; | |
2234 | struct tipc_node *node; | |
2235 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
1817877b | 2236 | struct net *net = sock_net(skb->sk); |
ae36342b RA |
2237 | |
2238 | if (!info->attrs[TIPC_NLA_LINK]) | |
2239 | return -EINVAL; | |
2240 | ||
2241 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
2242 | info->attrs[TIPC_NLA_LINK], | |
2243 | tipc_nl_link_policy); | |
2244 | if (err) | |
2245 | return err; | |
2246 | ||
2247 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
2248 | return -EINVAL; | |
2249 | ||
2250 | link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
2251 | ||
2252 | if (strcmp(link_name, tipc_bclink_name) == 0) { | |
1da46568 | 2253 | err = tipc_bclink_reset_stats(net); |
ae36342b RA |
2254 | if (err) |
2255 | return err; | |
2256 | return 0; | |
2257 | } | |
2258 | ||
f2f9800d | 2259 | node = tipc_link_find_owner(net, link_name, &bearer_id); |
ae36342b RA |
2260 | if (!node) |
2261 | return -EINVAL; | |
2262 | ||
2263 | tipc_node_lock(node); | |
2264 | ||
2265 | link = node->links[bearer_id]; | |
2266 | if (!link) { | |
2267 | tipc_node_unlock(node); | |
2268 | return -EINVAL; | |
2269 | } | |
2270 | ||
2271 | link_reset_statistics(link); | |
2272 | ||
2273 | tipc_node_unlock(node); | |
2274 | ||
2275 | return 0; | |
2276 | } |