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Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/link.c: TIPC link code | |
c4307285 | 3 | * |
c1336ee4 | 4 | * Copyright (c) 1996-2007, 2012-2015, Ericsson AB |
198d73b8 | 5 | * Copyright (c) 2004-2007, 2010-2013, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the names of the copyright holders nor the names of its | |
17 | * contributors may be used to endorse or promote products derived from | |
18 | * this software without specific prior written permission. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
20 | * Alternatively, this software may be distributed under the terms of the |
21 | * GNU General Public License ("GPL") version 2 as published by the Free | |
22 | * Software Foundation. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
37 | #include "core.h" | |
b97bf3fd | 38 | #include "link.h" |
7be57fc6 | 39 | #include "bcast.h" |
9816f061 | 40 | #include "socket.h" |
b97bf3fd | 41 | #include "name_distr.h" |
b97bf3fd | 42 | #include "discover.h" |
0655f6a8 | 43 | #include "netlink.h" |
b97bf3fd | 44 | |
796c75d0 YX |
45 | #include <linux/pkt_sched.h> |
46 | ||
2cf8aa19 EH |
47 | /* |
48 | * Error message prefixes | |
49 | */ | |
50 | static const char *link_co_err = "Link changeover error, "; | |
51 | static const char *link_rst_msg = "Resetting link "; | |
52 | static const char *link_unk_evt = "Unknown link event "; | |
b97bf3fd | 53 | |
7be57fc6 RA |
54 | static const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = { |
55 | [TIPC_NLA_LINK_UNSPEC] = { .type = NLA_UNSPEC }, | |
56 | [TIPC_NLA_LINK_NAME] = { | |
57 | .type = NLA_STRING, | |
58 | .len = TIPC_MAX_LINK_NAME | |
59 | }, | |
60 | [TIPC_NLA_LINK_MTU] = { .type = NLA_U32 }, | |
61 | [TIPC_NLA_LINK_BROADCAST] = { .type = NLA_FLAG }, | |
62 | [TIPC_NLA_LINK_UP] = { .type = NLA_FLAG }, | |
63 | [TIPC_NLA_LINK_ACTIVE] = { .type = NLA_FLAG }, | |
64 | [TIPC_NLA_LINK_PROP] = { .type = NLA_NESTED }, | |
65 | [TIPC_NLA_LINK_STATS] = { .type = NLA_NESTED }, | |
66 | [TIPC_NLA_LINK_RX] = { .type = NLA_U32 }, | |
67 | [TIPC_NLA_LINK_TX] = { .type = NLA_U32 } | |
68 | }; | |
69 | ||
0655f6a8 RA |
70 | /* Properties valid for media, bearar and link */ |
71 | static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = { | |
72 | [TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC }, | |
73 | [TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 }, | |
74 | [TIPC_NLA_PROP_TOL] = { .type = NLA_U32 }, | |
75 | [TIPC_NLA_PROP_WIN] = { .type = NLA_U32 } | |
76 | }; | |
77 | ||
a686e685 AS |
78 | /* |
79 | * Out-of-range value for link session numbers | |
80 | */ | |
a686e685 AS |
81 | #define INVALID_SESSION 0x10000 |
82 | ||
c4307285 YH |
83 | /* |
84 | * Link state events: | |
b97bf3fd | 85 | */ |
b97bf3fd PL |
86 | #define STARTING_EVT 856384768 /* link processing trigger */ |
87 | #define TRAFFIC_MSG_EVT 560815u /* rx'd ??? */ | |
88 | #define TIMEOUT_EVT 560817u /* link timer expired */ | |
89 | ||
c4307285 YH |
90 | /* |
91 | * The following two 'message types' is really just implementation | |
92 | * data conveniently stored in the message header. | |
b97bf3fd PL |
93 | * They must not be considered part of the protocol |
94 | */ | |
95 | #define OPEN_MSG 0 | |
96 | #define CLOSED_MSG 1 | |
97 | ||
c4307285 | 98 | /* |
b97bf3fd PL |
99 | * State value stored in 'exp_msg_count' |
100 | */ | |
b97bf3fd PL |
101 | #define START_CHANGEOVER 100000u |
102 | ||
c5898636 JPM |
103 | static void link_handle_out_of_seq_msg(struct tipc_link *link, |
104 | struct sk_buff *skb); | |
105 | static void tipc_link_proto_rcv(struct tipc_link *link, | |
106 | struct sk_buff *skb); | |
107 | static int tipc_link_tunnel_rcv(struct tipc_node *node, | |
108 | struct sk_buff **skb); | |
2f55c437 | 109 | static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol); |
a18c4bc3 PG |
110 | static void link_state_event(struct tipc_link *l_ptr, u32 event); |
111 | static void link_reset_statistics(struct tipc_link *l_ptr); | |
112 | static void link_print(struct tipc_link *l_ptr, const char *str); | |
247f0f3c YX |
113 | static void tipc_link_sync_xmit(struct tipc_link *l); |
114 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf); | |
c637c103 JPM |
115 | static void tipc_link_input(struct tipc_link *l, struct sk_buff *skb); |
116 | static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb); | |
31e3c3f6 | 117 | |
b97bf3fd | 118 | /* |
05790c64 | 119 | * Simple link routines |
b97bf3fd | 120 | */ |
05790c64 | 121 | static unsigned int align(unsigned int i) |
b97bf3fd PL |
122 | { |
123 | return (i + 3) & ~3u; | |
124 | } | |
125 | ||
2d72d495 JPM |
126 | static void tipc_link_release(struct kref *kref) |
127 | { | |
128 | kfree(container_of(kref, struct tipc_link, ref)); | |
129 | } | |
130 | ||
131 | static void tipc_link_get(struct tipc_link *l_ptr) | |
132 | { | |
133 | kref_get(&l_ptr->ref); | |
134 | } | |
135 | ||
136 | static void tipc_link_put(struct tipc_link *l_ptr) | |
137 | { | |
138 | kref_put(&l_ptr->ref, tipc_link_release); | |
139 | } | |
140 | ||
a18c4bc3 | 141 | static void link_init_max_pkt(struct tipc_link *l_ptr) |
b97bf3fd | 142 | { |
7f9f95d9 YX |
143 | struct tipc_node *node = l_ptr->owner; |
144 | struct tipc_net *tn = net_generic(node->net, tipc_net_id); | |
7a2f7d18 | 145 | struct tipc_bearer *b_ptr; |
b97bf3fd | 146 | u32 max_pkt; |
c4307285 | 147 | |
7a2f7d18 | 148 | rcu_read_lock(); |
7f9f95d9 | 149 | b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]); |
7a2f7d18 YX |
150 | if (!b_ptr) { |
151 | rcu_read_unlock(); | |
152 | return; | |
153 | } | |
154 | max_pkt = (b_ptr->mtu & ~3); | |
155 | rcu_read_unlock(); | |
156 | ||
b97bf3fd PL |
157 | if (max_pkt > MAX_MSG_SIZE) |
158 | max_pkt = MAX_MSG_SIZE; | |
159 | ||
c4307285 | 160 | l_ptr->max_pkt_target = max_pkt; |
b97bf3fd PL |
161 | if (l_ptr->max_pkt_target < MAX_PKT_DEFAULT) |
162 | l_ptr->max_pkt = l_ptr->max_pkt_target; | |
c4307285 | 163 | else |
b97bf3fd PL |
164 | l_ptr->max_pkt = MAX_PKT_DEFAULT; |
165 | ||
c4307285 | 166 | l_ptr->max_pkt_probes = 0; |
b97bf3fd PL |
167 | } |
168 | ||
b97bf3fd | 169 | /* |
05790c64 | 170 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 171 | */ |
a18c4bc3 | 172 | int tipc_link_is_up(struct tipc_link *l_ptr) |
b97bf3fd PL |
173 | { |
174 | if (!l_ptr) | |
175 | return 0; | |
a02cec21 | 176 | return link_working_working(l_ptr) || link_working_unknown(l_ptr); |
b97bf3fd PL |
177 | } |
178 | ||
a18c4bc3 | 179 | int tipc_link_is_active(struct tipc_link *l_ptr) |
b97bf3fd | 180 | { |
a02cec21 ED |
181 | return (l_ptr->owner->active_links[0] == l_ptr) || |
182 | (l_ptr->owner->active_links[1] == l_ptr); | |
b97bf3fd PL |
183 | } |
184 | ||
b97bf3fd PL |
185 | /** |
186 | * link_timeout - handle expiration of link timer | |
187 | * @l_ptr: pointer to link | |
b97bf3fd | 188 | */ |
2f55c437 | 189 | static void link_timeout(unsigned long data) |
b97bf3fd | 190 | { |
2f55c437 | 191 | struct tipc_link *l_ptr = (struct tipc_link *)data; |
58dc55f2 YX |
192 | struct sk_buff *skb; |
193 | ||
4323add6 | 194 | tipc_node_lock(l_ptr->owner); |
b97bf3fd PL |
195 | |
196 | /* update counters used in statistical profiling of send traffic */ | |
58dc55f2 | 197 | l_ptr->stats.accu_queue_sz += skb_queue_len(&l_ptr->outqueue); |
b97bf3fd PL |
198 | l_ptr->stats.queue_sz_counts++; |
199 | ||
58dc55f2 YX |
200 | skb = skb_peek(&l_ptr->outqueue); |
201 | if (skb) { | |
202 | struct tipc_msg *msg = buf_msg(skb); | |
b97bf3fd PL |
203 | u32 length = msg_size(msg); |
204 | ||
f64f9e71 JP |
205 | if ((msg_user(msg) == MSG_FRAGMENTER) && |
206 | (msg_type(msg) == FIRST_FRAGMENT)) { | |
b97bf3fd PL |
207 | length = msg_size(msg_get_wrapped(msg)); |
208 | } | |
209 | if (length) { | |
210 | l_ptr->stats.msg_lengths_total += length; | |
211 | l_ptr->stats.msg_length_counts++; | |
212 | if (length <= 64) | |
213 | l_ptr->stats.msg_length_profile[0]++; | |
214 | else if (length <= 256) | |
215 | l_ptr->stats.msg_length_profile[1]++; | |
216 | else if (length <= 1024) | |
217 | l_ptr->stats.msg_length_profile[2]++; | |
218 | else if (length <= 4096) | |
219 | l_ptr->stats.msg_length_profile[3]++; | |
220 | else if (length <= 16384) | |
221 | l_ptr->stats.msg_length_profile[4]++; | |
222 | else if (length <= 32768) | |
223 | l_ptr->stats.msg_length_profile[5]++; | |
224 | else | |
225 | l_ptr->stats.msg_length_profile[6]++; | |
226 | } | |
227 | } | |
228 | ||
229 | /* do all other link processing performed on a periodic basis */ | |
b97bf3fd PL |
230 | link_state_event(l_ptr, TIMEOUT_EVT); |
231 | ||
232 | if (l_ptr->next_out) | |
47b4c9a8 | 233 | tipc_link_push_packets(l_ptr); |
b97bf3fd | 234 | |
4323add6 | 235 | tipc_node_unlock(l_ptr->owner); |
2d72d495 | 236 | tipc_link_put(l_ptr); |
b97bf3fd PL |
237 | } |
238 | ||
2f55c437 | 239 | static void link_set_timer(struct tipc_link *link, unsigned long time) |
b97bf3fd | 240 | { |
2d72d495 JPM |
241 | if (!mod_timer(&link->timer, jiffies + time)) |
242 | tipc_link_get(link); | |
b97bf3fd PL |
243 | } |
244 | ||
245 | /** | |
4323add6 | 246 | * tipc_link_create - create a new link |
37b9c08a | 247 | * @n_ptr: pointer to associated node |
b97bf3fd | 248 | * @b_ptr: pointer to associated bearer |
b97bf3fd | 249 | * @media_addr: media address to use when sending messages over link |
c4307285 | 250 | * |
b97bf3fd PL |
251 | * Returns pointer to link. |
252 | */ | |
a18c4bc3 | 253 | struct tipc_link *tipc_link_create(struct tipc_node *n_ptr, |
c61dd61d YX |
254 | struct tipc_bearer *b_ptr, |
255 | const struct tipc_media_addr *media_addr) | |
b97bf3fd | 256 | { |
34747539 | 257 | struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id); |
a18c4bc3 | 258 | struct tipc_link *l_ptr; |
b97bf3fd PL |
259 | struct tipc_msg *msg; |
260 | char *if_name; | |
37b9c08a AS |
261 | char addr_string[16]; |
262 | u32 peer = n_ptr->addr; | |
263 | ||
0372bf5c | 264 | if (n_ptr->link_cnt >= MAX_BEARERS) { |
37b9c08a | 265 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
0372bf5c HB |
266 | pr_err("Attempt to establish %uth link to %s. Max %u allowed.\n", |
267 | n_ptr->link_cnt, addr_string, MAX_BEARERS); | |
37b9c08a AS |
268 | return NULL; |
269 | } | |
270 | ||
271 | if (n_ptr->links[b_ptr->identity]) { | |
272 | tipc_addr_string_fill(addr_string, n_ptr->addr); | |
2cf8aa19 EH |
273 | pr_err("Attempt to establish second link on <%s> to %s\n", |
274 | b_ptr->name, addr_string); | |
37b9c08a AS |
275 | return NULL; |
276 | } | |
b97bf3fd | 277 | |
0da974f4 | 278 | l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC); |
b97bf3fd | 279 | if (!l_ptr) { |
2cf8aa19 | 280 | pr_warn("Link creation failed, no memory\n"); |
b97bf3fd PL |
281 | return NULL; |
282 | } | |
2d72d495 | 283 | kref_init(&l_ptr->ref); |
b97bf3fd | 284 | l_ptr->addr = peer; |
2d627b92 | 285 | if_name = strchr(b_ptr->name, ':') + 1; |
062b4c99 | 286 | sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:unknown", |
34747539 YX |
287 | tipc_zone(tn->own_addr), tipc_cluster(tn->own_addr), |
288 | tipc_node(tn->own_addr), | |
b97bf3fd PL |
289 | if_name, |
290 | tipc_zone(peer), tipc_cluster(peer), tipc_node(peer)); | |
062b4c99 | 291 | /* note: peer i/f name is updated by reset/activate message */ |
b97bf3fd | 292 | memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr)); |
37b9c08a | 293 | l_ptr->owner = n_ptr; |
b97bf3fd | 294 | l_ptr->checkpoint = 1; |
f882cb76 | 295 | l_ptr->peer_session = INVALID_SESSION; |
7a2f7d18 | 296 | l_ptr->bearer_id = b_ptr->identity; |
5c216e1d | 297 | link_set_supervision_props(l_ptr, b_ptr->tolerance); |
b97bf3fd PL |
298 | l_ptr->state = RESET_UNKNOWN; |
299 | ||
300 | l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg; | |
301 | msg = l_ptr->pmsg; | |
c5898636 | 302 | tipc_msg_init(tn->own_addr, msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, |
34747539 | 303 | l_ptr->addr); |
b97bf3fd | 304 | msg_set_size(msg, sizeof(l_ptr->proto_msg)); |
bafa29e3 | 305 | msg_set_session(msg, (tn->random & 0xffff)); |
b97bf3fd PL |
306 | msg_set_bearer_id(msg, b_ptr->identity); |
307 | strcpy((char *)msg_data(msg), if_name); | |
308 | ||
309 | l_ptr->priority = b_ptr->priority; | |
5c216e1d | 310 | tipc_link_set_queue_limits(l_ptr, b_ptr->window); |
b97bf3fd | 311 | |
7a2f7d18 | 312 | l_ptr->net_plane = b_ptr->net_plane; |
b97bf3fd PL |
313 | link_init_max_pkt(l_ptr); |
314 | ||
315 | l_ptr->next_out_no = 1; | |
58dc55f2 | 316 | __skb_queue_head_init(&l_ptr->outqueue); |
bc6fecd4 | 317 | __skb_queue_head_init(&l_ptr->deferred_queue); |
c637c103 JPM |
318 | skb_queue_head_init(&l_ptr->wakeupq); |
319 | skb_queue_head_init(&l_ptr->inputq); | |
320 | skb_queue_head_init(&l_ptr->namedq); | |
b97bf3fd | 321 | link_reset_statistics(l_ptr); |
37b9c08a | 322 | tipc_node_attach_link(n_ptr, l_ptr); |
2f55c437 | 323 | setup_timer(&l_ptr->timer, link_timeout, (unsigned long)l_ptr); |
581465fa | 324 | link_state_event(l_ptr, STARTING_EVT); |
b97bf3fd | 325 | |
b97bf3fd PL |
326 | return l_ptr; |
327 | } | |
328 | ||
2d72d495 JPM |
329 | /** |
330 | * link_delete - Conditional deletion of link. | |
331 | * If timer still running, real delete is done when it expires | |
332 | * @link: link to be deleted | |
333 | */ | |
334 | void tipc_link_delete(struct tipc_link *link) | |
335 | { | |
336 | tipc_link_reset_fragments(link); | |
337 | tipc_node_detach_link(link->owner, link); | |
338 | tipc_link_put(link); | |
339 | } | |
340 | ||
f2f9800d YX |
341 | void tipc_link_delete_list(struct net *net, unsigned int bearer_id, |
342 | bool shutting_down) | |
8d8439b6 | 343 | { |
f2f9800d | 344 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
2d72d495 JPM |
345 | struct tipc_link *link; |
346 | struct tipc_node *node; | |
169bf912 | 347 | bool del_link; |
8d8439b6 | 348 | |
6c7a762e | 349 | rcu_read_lock(); |
2d72d495 JPM |
350 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
351 | tipc_node_lock(node); | |
352 | link = node->links[bearer_id]; | |
353 | if (!link) { | |
354 | tipc_node_unlock(node); | |
c61dd61d YX |
355 | continue; |
356 | } | |
169bf912 | 357 | del_link = !tipc_link_is_up(link) && !link->exp_msg_count; |
2d72d495 JPM |
358 | tipc_link_reset(link); |
359 | if (del_timer(&link->timer)) | |
360 | tipc_link_put(link); | |
361 | link->flags |= LINK_STOPPED; | |
362 | /* Delete link now, or when failover is finished: */ | |
169bf912 | 363 | if (shutting_down || !tipc_node_is_up(node) || del_link) |
2d72d495 JPM |
364 | tipc_link_delete(link); |
365 | tipc_node_unlock(node); | |
8d8439b6 | 366 | } |
6c7a762e | 367 | rcu_read_unlock(); |
8d8439b6 | 368 | } |
b97bf3fd PL |
369 | |
370 | /** | |
50100a5e JPM |
371 | * link_schedule_user - schedule user for wakeup after congestion |
372 | * @link: congested link | |
373 | * @oport: sending port | |
374 | * @chain_sz: size of buffer chain that was attempted sent | |
375 | * @imp: importance of message attempted sent | |
376 | * Create pseudo msg to send back to user when congestion abates | |
b97bf3fd | 377 | */ |
50100a5e JPM |
378 | static bool link_schedule_user(struct tipc_link *link, u32 oport, |
379 | uint chain_sz, uint imp) | |
b97bf3fd | 380 | { |
50100a5e JPM |
381 | struct sk_buff *buf; |
382 | ||
c5898636 JPM |
383 | buf = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, |
384 | link_own_addr(link), link_own_addr(link), | |
385 | oport, 0, 0); | |
50100a5e JPM |
386 | if (!buf) |
387 | return false; | |
388 | TIPC_SKB_CB(buf)->chain_sz = chain_sz; | |
389 | TIPC_SKB_CB(buf)->chain_imp = imp; | |
c637c103 | 390 | skb_queue_tail(&link->wakeupq, buf); |
50100a5e JPM |
391 | link->stats.link_congs++; |
392 | return true; | |
b97bf3fd PL |
393 | } |
394 | ||
50100a5e JPM |
395 | /** |
396 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
397 | * @link: congested link | |
398 | * Move a number of waiting users, as permitted by available space in | |
399 | * the send queue, from link wait queue to node wait queue for wakeup | |
400 | */ | |
c637c103 | 401 | void link_prepare_wakeup(struct tipc_link *link) |
b97bf3fd | 402 | { |
58dc55f2 | 403 | uint pend_qsz = skb_queue_len(&link->outqueue); |
58d78b32 | 404 | struct sk_buff *skb, *tmp; |
50100a5e | 405 | |
c637c103 | 406 | skb_queue_walk_safe(&link->wakeupq, skb, tmp) { |
58d78b32 | 407 | if (pend_qsz >= link->queue_limit[TIPC_SKB_CB(skb)->chain_imp]) |
b97bf3fd | 408 | break; |
58d78b32 | 409 | pend_qsz += TIPC_SKB_CB(skb)->chain_sz; |
c637c103 JPM |
410 | skb_unlink(skb, &link->wakeupq); |
411 | skb_queue_tail(&link->inputq, skb); | |
412 | link->owner->inputq = &link->inputq; | |
413 | link->owner->action_flags |= TIPC_MSG_EVT; | |
b97bf3fd | 414 | } |
b97bf3fd PL |
415 | } |
416 | ||
b97bf3fd | 417 | /** |
4323add6 | 418 | * tipc_link_reset_fragments - purge link's inbound message fragments queue |
b97bf3fd PL |
419 | * @l_ptr: pointer to link |
420 | */ | |
a18c4bc3 | 421 | void tipc_link_reset_fragments(struct tipc_link *l_ptr) |
b97bf3fd | 422 | { |
37e22164 JPM |
423 | kfree_skb(l_ptr->reasm_buf); |
424 | l_ptr->reasm_buf = NULL; | |
b97bf3fd PL |
425 | } |
426 | ||
c4307285 | 427 | /** |
581465fa | 428 | * tipc_link_purge_queues - purge all pkt queues associated with link |
b97bf3fd PL |
429 | * @l_ptr: pointer to link |
430 | */ | |
581465fa | 431 | void tipc_link_purge_queues(struct tipc_link *l_ptr) |
b97bf3fd | 432 | { |
bc6fecd4 | 433 | __skb_queue_purge(&l_ptr->deferred_queue); |
58dc55f2 | 434 | __skb_queue_purge(&l_ptr->outqueue); |
4323add6 | 435 | tipc_link_reset_fragments(l_ptr); |
b97bf3fd PL |
436 | } |
437 | ||
a18c4bc3 | 438 | void tipc_link_reset(struct tipc_link *l_ptr) |
b97bf3fd | 439 | { |
b97bf3fd PL |
440 | u32 prev_state = l_ptr->state; |
441 | u32 checkpoint = l_ptr->next_in_no; | |
5392d646 | 442 | int was_active_link = tipc_link_is_active(l_ptr); |
50100a5e | 443 | struct tipc_node *owner = l_ptr->owner; |
c4307285 | 444 | |
a686e685 | 445 | msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff)); |
b97bf3fd | 446 | |
a686e685 AS |
447 | /* Link is down, accept any session */ |
448 | l_ptr->peer_session = INVALID_SESSION; | |
b97bf3fd | 449 | |
c4307285 | 450 | /* Prepare for max packet size negotiation */ |
b97bf3fd | 451 | link_init_max_pkt(l_ptr); |
c4307285 | 452 | |
b97bf3fd | 453 | l_ptr->state = RESET_UNKNOWN; |
b97bf3fd PL |
454 | |
455 | if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET)) | |
456 | return; | |
457 | ||
4323add6 | 458 | tipc_node_link_down(l_ptr->owner, l_ptr); |
7f9f95d9 | 459 | tipc_bearer_remove_dest(owner->net, l_ptr->bearer_id, l_ptr->addr); |
7368ddf1 | 460 | |
b9d4c339 | 461 | if (was_active_link && tipc_node_active_links(l_ptr->owner)) { |
b97bf3fd PL |
462 | l_ptr->reset_checkpoint = checkpoint; |
463 | l_ptr->exp_msg_count = START_CHANGEOVER; | |
464 | } | |
465 | ||
c637c103 | 466 | /* Clean up all queues, except inputq: */ |
58dc55f2 | 467 | __skb_queue_purge(&l_ptr->outqueue); |
bc6fecd4 | 468 | __skb_queue_purge(&l_ptr->deferred_queue); |
e6441bae JPM |
469 | if (!owner->inputq) |
470 | owner->inputq = &l_ptr->inputq; | |
471 | skb_queue_splice_init(&l_ptr->wakeupq, owner->inputq); | |
472 | if (!skb_queue_empty(owner->inputq)) | |
c637c103 | 473 | owner->action_flags |= TIPC_MSG_EVT; |
b97bf3fd PL |
474 | l_ptr->next_out = NULL; |
475 | l_ptr->unacked_window = 0; | |
476 | l_ptr->checkpoint = 1; | |
477 | l_ptr->next_out_no = 1; | |
b97bf3fd PL |
478 | l_ptr->fsm_msg_cnt = 0; |
479 | l_ptr->stale_count = 0; | |
480 | link_reset_statistics(l_ptr); | |
b97bf3fd PL |
481 | } |
482 | ||
f2f9800d | 483 | void tipc_link_reset_list(struct net *net, unsigned int bearer_id) |
e0ca2c30 | 484 | { |
f2f9800d | 485 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
e0ca2c30 | 486 | struct tipc_link *l_ptr; |
c61dd61d | 487 | struct tipc_node *n_ptr; |
e0ca2c30 | 488 | |
6c7a762e | 489 | rcu_read_lock(); |
f2f9800d | 490 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
5356f3d7 | 491 | tipc_node_lock(n_ptr); |
c61dd61d YX |
492 | l_ptr = n_ptr->links[bearer_id]; |
493 | if (l_ptr) | |
494 | tipc_link_reset(l_ptr); | |
5356f3d7 | 495 | tipc_node_unlock(n_ptr); |
e0ca2c30 | 496 | } |
6c7a762e | 497 | rcu_read_unlock(); |
e0ca2c30 | 498 | } |
b97bf3fd | 499 | |
7f9f95d9 | 500 | static void link_activate(struct tipc_link *link) |
b97bf3fd | 501 | { |
7f9f95d9 YX |
502 | struct tipc_node *node = link->owner; |
503 | ||
504 | link->next_in_no = 1; | |
505 | link->stats.recv_info = 1; | |
506 | tipc_node_link_up(node, link); | |
507 | tipc_bearer_add_dest(node->net, link->bearer_id, link->addr); | |
b97bf3fd PL |
508 | } |
509 | ||
510 | /** | |
511 | * link_state_event - link finite state machine | |
512 | * @l_ptr: pointer to link | |
513 | * @event: state machine event to process | |
514 | */ | |
95c96174 | 515 | static void link_state_event(struct tipc_link *l_ptr, unsigned int event) |
b97bf3fd | 516 | { |
a18c4bc3 | 517 | struct tipc_link *other; |
2f55c437 | 518 | unsigned long cont_intv = l_ptr->cont_intv; |
b97bf3fd | 519 | |
7d33939f JPM |
520 | if (l_ptr->flags & LINK_STOPPED) |
521 | return; | |
522 | ||
135daee6 | 523 | if (!(l_ptr->flags & LINK_STARTED) && (event != STARTING_EVT)) |
b97bf3fd PL |
524 | return; /* Not yet. */ |
525 | ||
77a7e07a YX |
526 | /* Check whether changeover is going on */ |
527 | if (l_ptr->exp_msg_count) { | |
a016892c | 528 | if (event == TIMEOUT_EVT) |
b97bf3fd | 529 | link_set_timer(l_ptr, cont_intv); |
77a7e07a | 530 | return; |
b97bf3fd | 531 | } |
b97bf3fd PL |
532 | |
533 | switch (l_ptr->state) { | |
534 | case WORKING_WORKING: | |
b97bf3fd PL |
535 | switch (event) { |
536 | case TRAFFIC_MSG_EVT: | |
b97bf3fd | 537 | case ACTIVATE_MSG: |
b97bf3fd PL |
538 | break; |
539 | case TIMEOUT_EVT: | |
b97bf3fd PL |
540 | if (l_ptr->next_in_no != l_ptr->checkpoint) { |
541 | l_ptr->checkpoint = l_ptr->next_in_no; | |
4323add6 | 542 | if (tipc_bclink_acks_missing(l_ptr->owner)) { |
247f0f3c YX |
543 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
544 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
545 | l_ptr->fsm_msg_cnt++; |
546 | } else if (l_ptr->max_pkt < l_ptr->max_pkt_target) { | |
247f0f3c YX |
547 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
548 | 1, 0, 0, 0, 0); | |
b97bf3fd PL |
549 | l_ptr->fsm_msg_cnt++; |
550 | } | |
551 | link_set_timer(l_ptr, cont_intv); | |
552 | break; | |
553 | } | |
b97bf3fd PL |
554 | l_ptr->state = WORKING_UNKNOWN; |
555 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c | 556 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0); |
b97bf3fd PL |
557 | l_ptr->fsm_msg_cnt++; |
558 | link_set_timer(l_ptr, cont_intv / 4); | |
559 | break; | |
560 | case RESET_MSG: | |
3fa9cacd EH |
561 | pr_debug("%s<%s>, requested by peer\n", |
562 | link_rst_msg, l_ptr->name); | |
4323add6 | 563 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
564 | l_ptr->state = RESET_RESET; |
565 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
566 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
567 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
568 | l_ptr->fsm_msg_cnt++; |
569 | link_set_timer(l_ptr, cont_intv); | |
570 | break; | |
571 | default: | |
3fa9cacd | 572 | pr_debug("%s%u in WW state\n", link_unk_evt, event); |
b97bf3fd PL |
573 | } |
574 | break; | |
575 | case WORKING_UNKNOWN: | |
b97bf3fd PL |
576 | switch (event) { |
577 | case TRAFFIC_MSG_EVT: | |
b97bf3fd | 578 | case ACTIVATE_MSG: |
b97bf3fd PL |
579 | l_ptr->state = WORKING_WORKING; |
580 | l_ptr->fsm_msg_cnt = 0; | |
581 | link_set_timer(l_ptr, cont_intv); | |
582 | break; | |
583 | case RESET_MSG: | |
3fa9cacd EH |
584 | pr_debug("%s<%s>, requested by peer while probing\n", |
585 | link_rst_msg, l_ptr->name); | |
4323add6 | 586 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
587 | l_ptr->state = RESET_RESET; |
588 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
589 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
590 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
591 | l_ptr->fsm_msg_cnt++; |
592 | link_set_timer(l_ptr, cont_intv); | |
593 | break; | |
594 | case TIMEOUT_EVT: | |
b97bf3fd | 595 | if (l_ptr->next_in_no != l_ptr->checkpoint) { |
b97bf3fd PL |
596 | l_ptr->state = WORKING_WORKING; |
597 | l_ptr->fsm_msg_cnt = 0; | |
598 | l_ptr->checkpoint = l_ptr->next_in_no; | |
4323add6 | 599 | if (tipc_bclink_acks_missing(l_ptr->owner)) { |
247f0f3c YX |
600 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
601 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
602 | l_ptr->fsm_msg_cnt++; |
603 | } | |
604 | link_set_timer(l_ptr, cont_intv); | |
605 | } else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) { | |
247f0f3c YX |
606 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
607 | 1, 0, 0, 0, 0); | |
b97bf3fd PL |
608 | l_ptr->fsm_msg_cnt++; |
609 | link_set_timer(l_ptr, cont_intv / 4); | |
610 | } else { /* Link has failed */ | |
3fa9cacd EH |
611 | pr_debug("%s<%s>, peer not responding\n", |
612 | link_rst_msg, l_ptr->name); | |
4323add6 | 613 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
614 | l_ptr->state = RESET_UNKNOWN; |
615 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
616 | tipc_link_proto_xmit(l_ptr, RESET_MSG, |
617 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
618 | l_ptr->fsm_msg_cnt++; |
619 | link_set_timer(l_ptr, cont_intv); | |
620 | } | |
621 | break; | |
622 | default: | |
2cf8aa19 | 623 | pr_err("%s%u in WU state\n", link_unk_evt, event); |
b97bf3fd PL |
624 | } |
625 | break; | |
626 | case RESET_UNKNOWN: | |
b97bf3fd PL |
627 | switch (event) { |
628 | case TRAFFIC_MSG_EVT: | |
b97bf3fd PL |
629 | break; |
630 | case ACTIVATE_MSG: | |
631 | other = l_ptr->owner->active_links[0]; | |
8d64a5ba | 632 | if (other && link_working_unknown(other)) |
b97bf3fd | 633 | break; |
b97bf3fd PL |
634 | l_ptr->state = WORKING_WORKING; |
635 | l_ptr->fsm_msg_cnt = 0; | |
636 | link_activate(l_ptr); | |
247f0f3c | 637 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0); |
b97bf3fd | 638 | l_ptr->fsm_msg_cnt++; |
c64f7a6a | 639 | if (l_ptr->owner->working_links == 1) |
247f0f3c | 640 | tipc_link_sync_xmit(l_ptr); |
b97bf3fd PL |
641 | link_set_timer(l_ptr, cont_intv); |
642 | break; | |
643 | case RESET_MSG: | |
b97bf3fd PL |
644 | l_ptr->state = RESET_RESET; |
645 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
646 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
647 | 1, 0, 0, 0, 0); | |
b97bf3fd PL |
648 | l_ptr->fsm_msg_cnt++; |
649 | link_set_timer(l_ptr, cont_intv); | |
650 | break; | |
651 | case STARTING_EVT: | |
135daee6 | 652 | l_ptr->flags |= LINK_STARTED; |
af9946fd JPM |
653 | l_ptr->fsm_msg_cnt++; |
654 | link_set_timer(l_ptr, cont_intv); | |
655 | break; | |
b97bf3fd | 656 | case TIMEOUT_EVT: |
247f0f3c | 657 | tipc_link_proto_xmit(l_ptr, RESET_MSG, 0, 0, 0, 0, 0); |
b97bf3fd PL |
658 | l_ptr->fsm_msg_cnt++; |
659 | link_set_timer(l_ptr, cont_intv); | |
660 | break; | |
661 | default: | |
2cf8aa19 | 662 | pr_err("%s%u in RU state\n", link_unk_evt, event); |
b97bf3fd PL |
663 | } |
664 | break; | |
665 | case RESET_RESET: | |
b97bf3fd PL |
666 | switch (event) { |
667 | case TRAFFIC_MSG_EVT: | |
b97bf3fd PL |
668 | case ACTIVATE_MSG: |
669 | other = l_ptr->owner->active_links[0]; | |
8d64a5ba | 670 | if (other && link_working_unknown(other)) |
b97bf3fd | 671 | break; |
b97bf3fd PL |
672 | l_ptr->state = WORKING_WORKING; |
673 | l_ptr->fsm_msg_cnt = 0; | |
674 | link_activate(l_ptr); | |
247f0f3c | 675 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0); |
b97bf3fd | 676 | l_ptr->fsm_msg_cnt++; |
c64f7a6a | 677 | if (l_ptr->owner->working_links == 1) |
247f0f3c | 678 | tipc_link_sync_xmit(l_ptr); |
b97bf3fd PL |
679 | link_set_timer(l_ptr, cont_intv); |
680 | break; | |
681 | case RESET_MSG: | |
b97bf3fd PL |
682 | break; |
683 | case TIMEOUT_EVT: | |
247f0f3c YX |
684 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
685 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
686 | l_ptr->fsm_msg_cnt++; |
687 | link_set_timer(l_ptr, cont_intv); | |
b97bf3fd PL |
688 | break; |
689 | default: | |
2cf8aa19 | 690 | pr_err("%s%u in RR state\n", link_unk_evt, event); |
b97bf3fd PL |
691 | } |
692 | break; | |
693 | default: | |
2cf8aa19 | 694 | pr_err("Unknown link state %u/%u\n", l_ptr->state, event); |
b97bf3fd PL |
695 | } |
696 | } | |
697 | ||
4f1688b2 JPM |
698 | /* tipc_link_cong: determine return value and how to treat the |
699 | * sent buffer during link congestion. | |
700 | * - For plain, errorless user data messages we keep the buffer and | |
701 | * return -ELINKONG. | |
702 | * - For all other messages we discard the buffer and return -EHOSTUNREACH | |
703 | * - For TIPC internal messages we also reset the link | |
704 | */ | |
a6ca1094 | 705 | static int tipc_link_cong(struct tipc_link *link, struct sk_buff_head *list) |
4f1688b2 | 706 | { |
a6ca1094 YX |
707 | struct sk_buff *skb = skb_peek(list); |
708 | struct tipc_msg *msg = buf_msg(skb); | |
4f1688b2 JPM |
709 | uint imp = tipc_msg_tot_importance(msg); |
710 | u32 oport = msg_tot_origport(msg); | |
711 | ||
50100a5e | 712 | if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) { |
4f1688b2 JPM |
713 | pr_warn("%s<%s>, send queue full", link_rst_msg, link->name); |
714 | tipc_link_reset(link); | |
50100a5e | 715 | goto drop; |
4f1688b2 | 716 | } |
50100a5e JPM |
717 | if (unlikely(msg_errcode(msg))) |
718 | goto drop; | |
719 | if (unlikely(msg_reroute_cnt(msg))) | |
720 | goto drop; | |
a6ca1094 | 721 | if (TIPC_SKB_CB(skb)->wakeup_pending) |
50100a5e | 722 | return -ELINKCONG; |
a6ca1094 | 723 | if (link_schedule_user(link, oport, skb_queue_len(list), imp)) |
50100a5e JPM |
724 | return -ELINKCONG; |
725 | drop: | |
a6ca1094 | 726 | __skb_queue_purge(list); |
4f1688b2 JPM |
727 | return -EHOSTUNREACH; |
728 | } | |
729 | ||
730 | /** | |
9fbfb8b1 | 731 | * __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked |
4f1688b2 | 732 | * @link: link to use |
a6ca1094 YX |
733 | * @list: chain of buffers containing message |
734 | * | |
4f1688b2 JPM |
735 | * Consumes the buffer chain, except when returning -ELINKCONG |
736 | * Returns 0 if success, otherwise errno: -ELINKCONG, -EMSGSIZE (plain socket | |
737 | * user data messages) or -EHOSTUNREACH (all other messages/senders) | |
738 | * Only the socket functions tipc_send_stream() and tipc_send_packet() need | |
739 | * to act on the return value, since they may need to do more send attempts. | |
740 | */ | |
7f9f95d9 YX |
741 | int __tipc_link_xmit(struct net *net, struct tipc_link *link, |
742 | struct sk_buff_head *list) | |
4f1688b2 | 743 | { |
a6ca1094 | 744 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
4f1688b2 | 745 | uint psz = msg_size(msg); |
4f1688b2 JPM |
746 | uint sndlim = link->queue_limit[0]; |
747 | uint imp = tipc_msg_tot_importance(msg); | |
748 | uint mtu = link->max_pkt; | |
749 | uint ack = mod(link->next_in_no - 1); | |
750 | uint seqno = link->next_out_no; | |
751 | uint bc_last_in = link->owner->bclink.last_in; | |
752 | struct tipc_media_addr *addr = &link->media_addr; | |
58dc55f2 | 753 | struct sk_buff_head *outqueue = &link->outqueue; |
a6ca1094 | 754 | struct sk_buff *skb, *tmp; |
4f1688b2 JPM |
755 | |
756 | /* Match queue limits against msg importance: */ | |
58dc55f2 | 757 | if (unlikely(skb_queue_len(outqueue) >= link->queue_limit[imp])) |
a6ca1094 | 758 | return tipc_link_cong(link, list); |
4f1688b2 JPM |
759 | |
760 | /* Has valid packet limit been used ? */ | |
761 | if (unlikely(psz > mtu)) { | |
a6ca1094 | 762 | __skb_queue_purge(list); |
4f1688b2 JPM |
763 | return -EMSGSIZE; |
764 | } | |
765 | ||
766 | /* Prepare each packet for sending, and add to outqueue: */ | |
a6ca1094 YX |
767 | skb_queue_walk_safe(list, skb, tmp) { |
768 | __skb_unlink(skb, list); | |
58dc55f2 | 769 | msg = buf_msg(skb); |
4f1688b2 JPM |
770 | msg_set_word(msg, 2, ((ack << 16) | mod(seqno))); |
771 | msg_set_bcast_ack(msg, bc_last_in); | |
772 | ||
58dc55f2 YX |
773 | if (skb_queue_len(outqueue) < sndlim) { |
774 | __skb_queue_tail(outqueue, skb); | |
7f9f95d9 YX |
775 | tipc_bearer_send(net, link->bearer_id, |
776 | skb, addr); | |
58dc55f2 YX |
777 | link->next_out = NULL; |
778 | link->unacked_window = 0; | |
779 | } else if (tipc_msg_bundle(outqueue, skb, mtu)) { | |
4f1688b2 | 780 | link->stats.sent_bundled++; |
4f1688b2 | 781 | continue; |
c5898636 | 782 | } else if (tipc_msg_make_bundle(outqueue, skb, mtu, |
58dc55f2 | 783 | link->addr)) { |
4f1688b2 JPM |
784 | link->stats.sent_bundled++; |
785 | link->stats.sent_bundles++; | |
4f1688b2 | 786 | if (!link->next_out) |
58dc55f2 | 787 | link->next_out = skb_peek_tail(outqueue); |
4f1688b2 | 788 | } else { |
58dc55f2 | 789 | __skb_queue_tail(outqueue, skb); |
4f1688b2 | 790 | if (!link->next_out) |
58dc55f2 | 791 | link->next_out = skb; |
4f1688b2 JPM |
792 | } |
793 | seqno++; | |
4f1688b2 JPM |
794 | } |
795 | link->next_out_no = seqno; | |
4f1688b2 JPM |
796 | return 0; |
797 | } | |
798 | ||
a6ca1094 YX |
799 | static void skb2list(struct sk_buff *skb, struct sk_buff_head *list) |
800 | { | |
c637c103 | 801 | skb_queue_head_init(list); |
a6ca1094 YX |
802 | __skb_queue_tail(list, skb); |
803 | } | |
804 | ||
805 | static int __tipc_link_xmit_skb(struct tipc_link *link, struct sk_buff *skb) | |
806 | { | |
807 | struct sk_buff_head head; | |
808 | ||
809 | skb2list(skb, &head); | |
7f9f95d9 | 810 | return __tipc_link_xmit(link->owner->net, link, &head); |
a6ca1094 YX |
811 | } |
812 | ||
f2f9800d YX |
813 | int tipc_link_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode, |
814 | u32 selector) | |
a6ca1094 YX |
815 | { |
816 | struct sk_buff_head head; | |
817 | ||
818 | skb2list(skb, &head); | |
f2f9800d | 819 | return tipc_link_xmit(net, &head, dnode, selector); |
a6ca1094 YX |
820 | } |
821 | ||
4f1688b2 | 822 | /** |
9fbfb8b1 | 823 | * tipc_link_xmit() is the general link level function for message sending |
f2f9800d | 824 | * @net: the applicable net namespace |
a6ca1094 | 825 | * @list: chain of buffers containing message |
4f1688b2 JPM |
826 | * @dsz: amount of user data to be sent |
827 | * @dnode: address of destination node | |
828 | * @selector: a number used for deterministic link selection | |
829 | * Consumes the buffer chain, except when returning -ELINKCONG | |
830 | * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE | |
831 | */ | |
f2f9800d YX |
832 | int tipc_link_xmit(struct net *net, struct sk_buff_head *list, u32 dnode, |
833 | u32 selector) | |
4f1688b2 JPM |
834 | { |
835 | struct tipc_link *link = NULL; | |
836 | struct tipc_node *node; | |
837 | int rc = -EHOSTUNREACH; | |
838 | ||
f2f9800d | 839 | node = tipc_node_find(net, dnode); |
4f1688b2 JPM |
840 | if (node) { |
841 | tipc_node_lock(node); | |
842 | link = node->active_links[selector & 1]; | |
843 | if (link) | |
7f9f95d9 | 844 | rc = __tipc_link_xmit(net, link, list); |
4f1688b2 JPM |
845 | tipc_node_unlock(node); |
846 | } | |
4f1688b2 JPM |
847 | if (link) |
848 | return rc; | |
849 | ||
c637c103 JPM |
850 | if (likely(in_own_node(net, dnode))) |
851 | return tipc_sk_rcv(net, list); | |
4f1688b2 | 852 | |
c637c103 | 853 | __skb_queue_purge(list); |
4f1688b2 JPM |
854 | return rc; |
855 | } | |
856 | ||
c64f7a6a | 857 | /* |
247f0f3c | 858 | * tipc_link_sync_xmit - synchronize broadcast link endpoints. |
c64f7a6a JM |
859 | * |
860 | * Give a newly added peer node the sequence number where it should | |
861 | * start receiving and acking broadcast packets. | |
862 | * | |
863 | * Called with node locked | |
864 | */ | |
25b660c7 | 865 | static void tipc_link_sync_xmit(struct tipc_link *link) |
c64f7a6a | 866 | { |
a6ca1094 | 867 | struct sk_buff *skb; |
c64f7a6a JM |
868 | struct tipc_msg *msg; |
869 | ||
a6ca1094 YX |
870 | skb = tipc_buf_acquire(INT_H_SIZE); |
871 | if (!skb) | |
c64f7a6a JM |
872 | return; |
873 | ||
a6ca1094 | 874 | msg = buf_msg(skb); |
c5898636 | 875 | tipc_msg_init(link_own_addr(link), msg, BCAST_PROTOCOL, STATE_MSG, |
34747539 | 876 | INT_H_SIZE, link->addr); |
25b660c7 | 877 | msg_set_last_bcast(msg, link->owner->bclink.acked); |
a6ca1094 | 878 | __tipc_link_xmit_skb(link, skb); |
c64f7a6a JM |
879 | } |
880 | ||
881 | /* | |
247f0f3c | 882 | * tipc_link_sync_rcv - synchronize broadcast link endpoints. |
c64f7a6a JM |
883 | * Receive the sequence number where we should start receiving and |
884 | * acking broadcast packets from a newly added peer node, and open | |
885 | * up for reception of such packets. | |
886 | * | |
887 | * Called with node locked | |
888 | */ | |
247f0f3c | 889 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf) |
c64f7a6a JM |
890 | { |
891 | struct tipc_msg *msg = buf_msg(buf); | |
892 | ||
893 | n->bclink.last_sent = n->bclink.last_in = msg_last_bcast(msg); | |
894 | n->bclink.recv_permitted = true; | |
895 | kfree_skb(buf); | |
896 | } | |
897 | ||
58dc55f2 YX |
898 | struct sk_buff *tipc_skb_queue_next(const struct sk_buff_head *list, |
899 | const struct sk_buff *skb) | |
900 | { | |
901 | if (skb_queue_is_last(list, skb)) | |
902 | return NULL; | |
903 | return skb->next; | |
904 | } | |
905 | ||
c4307285 | 906 | /* |
47b4c9a8 YX |
907 | * tipc_link_push_packets - push unsent packets to bearer |
908 | * | |
909 | * Push out the unsent messages of a link where congestion | |
910 | * has abated. Node is locked. | |
911 | * | |
912 | * Called with node locked | |
b97bf3fd | 913 | */ |
47b4c9a8 | 914 | void tipc_link_push_packets(struct tipc_link *l_ptr) |
b97bf3fd | 915 | { |
58dc55f2 YX |
916 | struct sk_buff_head *outqueue = &l_ptr->outqueue; |
917 | struct sk_buff *skb = l_ptr->next_out; | |
47b4c9a8 YX |
918 | struct tipc_msg *msg; |
919 | u32 next, first; | |
b97bf3fd | 920 | |
58dc55f2 | 921 | skb_queue_walk_from(outqueue, skb) { |
47b4c9a8 YX |
922 | msg = buf_msg(skb); |
923 | next = msg_seqno(msg); | |
58dc55f2 | 924 | first = buf_seqno(skb_peek(outqueue)); |
b97bf3fd PL |
925 | |
926 | if (mod(next - first) < l_ptr->queue_limit[0]) { | |
927 | msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); | |
c4307285 | 928 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
3c294cb3 | 929 | if (msg_user(msg) == MSG_BUNDLER) |
58311d16 | 930 | TIPC_SKB_CB(skb)->bundling = false; |
7f9f95d9 YX |
931 | tipc_bearer_send(l_ptr->owner->net, |
932 | l_ptr->bearer_id, skb, | |
47b4c9a8 | 933 | &l_ptr->media_addr); |
58dc55f2 | 934 | l_ptr->next_out = tipc_skb_queue_next(outqueue, skb); |
47b4c9a8 YX |
935 | } else { |
936 | break; | |
b97bf3fd PL |
937 | } |
938 | } | |
b97bf3fd PL |
939 | } |
940 | ||
3f5a12bd | 941 | void tipc_link_reset_all(struct tipc_node *node) |
d356eeba | 942 | { |
d356eeba AS |
943 | char addr_string[16]; |
944 | u32 i; | |
945 | ||
3f5a12bd | 946 | tipc_node_lock(node); |
d356eeba | 947 | |
2cf8aa19 | 948 | pr_warn("Resetting all links to %s\n", |
3f5a12bd | 949 | tipc_addr_string_fill(addr_string, node->addr)); |
d356eeba AS |
950 | |
951 | for (i = 0; i < MAX_BEARERS; i++) { | |
3f5a12bd YX |
952 | if (node->links[i]) { |
953 | link_print(node->links[i], "Resetting link\n"); | |
954 | tipc_link_reset(node->links[i]); | |
d356eeba AS |
955 | } |
956 | } | |
957 | ||
3f5a12bd | 958 | tipc_node_unlock(node); |
d356eeba AS |
959 | } |
960 | ||
a18c4bc3 | 961 | static void link_retransmit_failure(struct tipc_link *l_ptr, |
ae8509c4 | 962 | struct sk_buff *buf) |
d356eeba AS |
963 | { |
964 | struct tipc_msg *msg = buf_msg(buf); | |
1da46568 | 965 | struct net *net = l_ptr->owner->net; |
d356eeba | 966 | |
2cf8aa19 | 967 | pr_warn("Retransmission failure on link <%s>\n", l_ptr->name); |
d356eeba AS |
968 | |
969 | if (l_ptr->addr) { | |
d356eeba | 970 | /* Handle failure on standard link */ |
8d64a5ba | 971 | link_print(l_ptr, "Resetting link\n"); |
d356eeba AS |
972 | tipc_link_reset(l_ptr); |
973 | ||
974 | } else { | |
d356eeba | 975 | /* Handle failure on broadcast link */ |
6c00055a | 976 | struct tipc_node *n_ptr; |
d356eeba AS |
977 | char addr_string[16]; |
978 | ||
2cf8aa19 EH |
979 | pr_info("Msg seq number: %u, ", msg_seqno(msg)); |
980 | pr_cont("Outstanding acks: %lu\n", | |
981 | (unsigned long) TIPC_SKB_CB(buf)->handle); | |
617dbeaa | 982 | |
1da46568 | 983 | n_ptr = tipc_bclink_retransmit_to(net); |
d356eeba AS |
984 | tipc_node_lock(n_ptr); |
985 | ||
c68ca7b7 | 986 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
2cf8aa19 | 987 | pr_info("Broadcast link info for %s\n", addr_string); |
389dd9bc YX |
988 | pr_info("Reception permitted: %d, Acked: %u\n", |
989 | n_ptr->bclink.recv_permitted, | |
2cf8aa19 EH |
990 | n_ptr->bclink.acked); |
991 | pr_info("Last in: %u, Oos state: %u, Last sent: %u\n", | |
992 | n_ptr->bclink.last_in, | |
993 | n_ptr->bclink.oos_state, | |
994 | n_ptr->bclink.last_sent); | |
d356eeba | 995 | |
d356eeba AS |
996 | tipc_node_unlock(n_ptr); |
997 | ||
1da46568 | 998 | tipc_bclink_set_flags(net, TIPC_BCLINK_RESET); |
d356eeba AS |
999 | l_ptr->stale_count = 0; |
1000 | } | |
1001 | } | |
1002 | ||
58dc55f2 | 1003 | void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb, |
4323add6 | 1004 | u32 retransmits) |
b97bf3fd PL |
1005 | { |
1006 | struct tipc_msg *msg; | |
1007 | ||
58dc55f2 | 1008 | if (!skb) |
d356eeba AS |
1009 | return; |
1010 | ||
58dc55f2 | 1011 | msg = buf_msg(skb); |
c4307285 | 1012 | |
512137ee EH |
1013 | /* Detect repeated retransmit failures */ |
1014 | if (l_ptr->last_retransmitted == msg_seqno(msg)) { | |
1015 | if (++l_ptr->stale_count > 100) { | |
58dc55f2 | 1016 | link_retransmit_failure(l_ptr, skb); |
512137ee | 1017 | return; |
d356eeba AS |
1018 | } |
1019 | } else { | |
512137ee EH |
1020 | l_ptr->last_retransmitted = msg_seqno(msg); |
1021 | l_ptr->stale_count = 1; | |
b97bf3fd | 1022 | } |
d356eeba | 1023 | |
58dc55f2 YX |
1024 | skb_queue_walk_from(&l_ptr->outqueue, skb) { |
1025 | if (!retransmits || skb == l_ptr->next_out) | |
1026 | break; | |
1027 | msg = buf_msg(skb); | |
b97bf3fd | 1028 | msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); |
c4307285 | 1029 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
7f9f95d9 YX |
1030 | tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, skb, |
1031 | &l_ptr->media_addr); | |
3c294cb3 YX |
1032 | retransmits--; |
1033 | l_ptr->stats.retransmitted++; | |
b97bf3fd | 1034 | } |
b97bf3fd PL |
1035 | } |
1036 | ||
f03273f1 YX |
1037 | static void link_retrieve_defq(struct tipc_link *link, |
1038 | struct sk_buff_head *list) | |
b97bf3fd PL |
1039 | { |
1040 | u32 seq_no; | |
1041 | ||
f03273f1 YX |
1042 | if (skb_queue_empty(&link->deferred_queue)) |
1043 | return; | |
1044 | ||
1045 | seq_no = buf_seqno(skb_peek(&link->deferred_queue)); | |
1046 | if (seq_no == mod(link->next_in_no)) | |
1047 | skb_queue_splice_tail_init(&link->deferred_queue, list); | |
b97bf3fd PL |
1048 | } |
1049 | ||
b02b69c8 | 1050 | /** |
170b3927 | 1051 | * tipc_rcv - process TIPC packets/messages arriving from off-node |
f2f9800d | 1052 | * @net: the applicable net namespace |
f03273f1 | 1053 | * @skb: TIPC packet |
7a2f7d18 | 1054 | * @b_ptr: pointer to bearer message arrived on |
b02b69c8 AS |
1055 | * |
1056 | * Invoked with no locks held. Bearer pointer must point to a valid bearer | |
1057 | * structure (i.e. cannot be NULL), but bearer can be inactive. | |
1058 | */ | |
c93d3baa | 1059 | void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr) |
b97bf3fd | 1060 | { |
34747539 | 1061 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
f03273f1 YX |
1062 | struct sk_buff_head head; |
1063 | struct tipc_node *n_ptr; | |
1064 | struct tipc_link *l_ptr; | |
1065 | struct sk_buff *skb1, *tmp; | |
1066 | struct tipc_msg *msg; | |
1067 | u32 seq_no; | |
1068 | u32 ackd; | |
1069 | u32 released; | |
b97bf3fd | 1070 | |
a6ca1094 | 1071 | skb2list(skb, &head); |
85035568 | 1072 | |
f03273f1 | 1073 | while ((skb = __skb_dequeue(&head))) { |
85035568 | 1074 | /* Ensure message is well-formed */ |
cf2157f8 | 1075 | if (unlikely(!tipc_msg_validate(skb))) |
3af390e2 | 1076 | goto discard; |
b97bf3fd | 1077 | |
85035568 | 1078 | /* Handle arrival of a non-unicast link message */ |
f03273f1 | 1079 | msg = buf_msg(skb); |
b97bf3fd | 1080 | if (unlikely(msg_non_seq(msg))) { |
1265a021 | 1081 | if (msg_user(msg) == LINK_CONFIG) |
c93d3baa | 1082 | tipc_disc_rcv(net, skb, b_ptr); |
1265a021 | 1083 | else |
c93d3baa | 1084 | tipc_bclink_rcv(net, skb); |
b97bf3fd PL |
1085 | continue; |
1086 | } | |
c4307285 | 1087 | |
ed33a9c4 | 1088 | /* Discard unicast link messages destined for another node */ |
26008247 | 1089 | if (unlikely(!msg_short(msg) && |
34747539 | 1090 | (msg_destnode(msg) != tn->own_addr))) |
3af390e2 | 1091 | goto discard; |
c4307285 | 1092 | |
5a68d5ee | 1093 | /* Locate neighboring node that sent message */ |
f2f9800d | 1094 | n_ptr = tipc_node_find(net, msg_prevnode(msg)); |
b97bf3fd | 1095 | if (unlikely(!n_ptr)) |
3af390e2 | 1096 | goto discard; |
4323add6 | 1097 | tipc_node_lock(n_ptr); |
85035568 | 1098 | |
b4b56102 | 1099 | /* Locate unicast link endpoint that should handle message */ |
b4b56102 | 1100 | l_ptr = n_ptr->links[b_ptr->identity]; |
3af390e2 | 1101 | if (unlikely(!l_ptr)) |
c637c103 | 1102 | goto unlock; |
5a68d5ee | 1103 | |
b4b56102 | 1104 | /* Verify that communication with node is currently allowed */ |
aecb9bb8 | 1105 | if ((n_ptr->action_flags & TIPC_WAIT_PEER_LINKS_DOWN) && |
10f465c4 YX |
1106 | msg_user(msg) == LINK_PROTOCOL && |
1107 | (msg_type(msg) == RESET_MSG || | |
1108 | msg_type(msg) == ACTIVATE_MSG) && | |
1109 | !msg_redundant_link(msg)) | |
aecb9bb8 | 1110 | n_ptr->action_flags &= ~TIPC_WAIT_PEER_LINKS_DOWN; |
10f465c4 YX |
1111 | |
1112 | if (tipc_node_blocked(n_ptr)) | |
c637c103 | 1113 | goto unlock; |
85035568 AS |
1114 | |
1115 | /* Validate message sequence number info */ | |
85035568 AS |
1116 | seq_no = msg_seqno(msg); |
1117 | ackd = msg_ack(msg); | |
1118 | ||
1119 | /* Release acked messages */ | |
2cdf3918 | 1120 | if (unlikely(n_ptr->bclink.acked != msg_bcast_ack(msg))) |
36559591 | 1121 | tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg)); |
b97bf3fd | 1122 | |
58dc55f2 YX |
1123 | released = 0; |
1124 | skb_queue_walk_safe(&l_ptr->outqueue, skb1, tmp) { | |
1125 | if (skb1 == l_ptr->next_out || | |
1126 | more(buf_seqno(skb1), ackd)) | |
1127 | break; | |
1128 | __skb_unlink(skb1, &l_ptr->outqueue); | |
1129 | kfree_skb(skb1); | |
1130 | released = 1; | |
b97bf3fd | 1131 | } |
85035568 AS |
1132 | |
1133 | /* Try sending any messages link endpoint has pending */ | |
b97bf3fd | 1134 | if (unlikely(l_ptr->next_out)) |
47b4c9a8 | 1135 | tipc_link_push_packets(l_ptr); |
a5377831 | 1136 | |
c637c103 | 1137 | if (released && !skb_queue_empty(&l_ptr->wakeupq)) |
50100a5e | 1138 | link_prepare_wakeup(l_ptr); |
a5377831 | 1139 | |
a5377831 | 1140 | /* Process the incoming packet */ |
3af390e2 YX |
1141 | if (unlikely(!link_working_working(l_ptr))) { |
1142 | if (msg_user(msg) == LINK_PROTOCOL) { | |
c5898636 | 1143 | tipc_link_proto_rcv(l_ptr, skb); |
f03273f1 | 1144 | link_retrieve_defq(l_ptr, &head); |
c637c103 JPM |
1145 | skb = NULL; |
1146 | goto unlock; | |
b97bf3fd | 1147 | } |
3af390e2 YX |
1148 | |
1149 | /* Traffic message. Conditionally activate link */ | |
1150 | link_state_event(l_ptr, TRAFFIC_MSG_EVT); | |
1151 | ||
1152 | if (link_working_working(l_ptr)) { | |
1153 | /* Re-insert buffer in front of queue */ | |
f03273f1 | 1154 | __skb_queue_head(&head, skb); |
c637c103 JPM |
1155 | skb = NULL; |
1156 | goto unlock; | |
3af390e2 | 1157 | } |
c637c103 | 1158 | goto unlock; |
3af390e2 YX |
1159 | } |
1160 | ||
1161 | /* Link is now in state WORKING_WORKING */ | |
1162 | if (unlikely(seq_no != mod(l_ptr->next_in_no))) { | |
c5898636 | 1163 | link_handle_out_of_seq_msg(l_ptr, skb); |
f03273f1 | 1164 | link_retrieve_defq(l_ptr, &head); |
c637c103 JPM |
1165 | skb = NULL; |
1166 | goto unlock; | |
b97bf3fd | 1167 | } |
3af390e2 | 1168 | l_ptr->next_in_no++; |
bc6fecd4 | 1169 | if (unlikely(!skb_queue_empty(&l_ptr->deferred_queue))) |
f03273f1 | 1170 | link_retrieve_defq(l_ptr, &head); |
a5377831 | 1171 | |
3f53bd8f EH |
1172 | if (unlikely(++l_ptr->unacked_window >= TIPC_MIN_LINK_WIN)) { |
1173 | l_ptr->stats.sent_acks++; | |
1174 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0); | |
1175 | } | |
c637c103 JPM |
1176 | tipc_link_input(l_ptr, skb); |
1177 | skb = NULL; | |
1178 | unlock: | |
3af390e2 YX |
1179 | tipc_node_unlock(n_ptr); |
1180 | discard: | |
c637c103 JPM |
1181 | if (unlikely(skb)) |
1182 | kfree_skb(skb); | |
b97bf3fd | 1183 | } |
b97bf3fd PL |
1184 | } |
1185 | ||
c637c103 | 1186 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 1187 | * |
c637c103 | 1188 | * Consumes buffer if message is of right type |
7ae934be EH |
1189 | * Node lock must be held |
1190 | */ | |
c637c103 | 1191 | static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb) |
7ae934be | 1192 | { |
c637c103 JPM |
1193 | struct tipc_node *node = link->owner; |
1194 | struct tipc_msg *msg = buf_msg(skb); | |
1195 | u32 dport = msg_destport(msg); | |
7ae934be | 1196 | |
7ae934be | 1197 | switch (msg_user(msg)) { |
c637c103 JPM |
1198 | case TIPC_LOW_IMPORTANCE: |
1199 | case TIPC_MEDIUM_IMPORTANCE: | |
1200 | case TIPC_HIGH_IMPORTANCE: | |
1201 | case TIPC_CRITICAL_IMPORTANCE: | |
1202 | case CONN_MANAGER: | |
1203 | if (tipc_skb_queue_tail(&link->inputq, skb, dport)) { | |
1204 | node->inputq = &link->inputq; | |
1205 | node->action_flags |= TIPC_MSG_EVT; | |
7ae934be | 1206 | } |
c637c103 | 1207 | return true; |
7ae934be | 1208 | case NAME_DISTRIBUTOR: |
c637c103 JPM |
1209 | node->bclink.recv_permitted = true; |
1210 | node->namedq = &link->namedq; | |
1211 | skb_queue_tail(&link->namedq, skb); | |
1212 | if (skb_queue_len(&link->namedq) == 1) | |
1213 | node->action_flags |= TIPC_NAMED_MSG_EVT; | |
1214 | return true; | |
1215 | case MSG_BUNDLER: | |
1216 | case CHANGEOVER_PROTOCOL: | |
1217 | case MSG_FRAGMENTER: | |
7ae934be | 1218 | case BCAST_PROTOCOL: |
c637c103 | 1219 | return false; |
7ae934be | 1220 | default: |
c637c103 JPM |
1221 | pr_warn("Dropping received illegal msg type\n"); |
1222 | kfree_skb(skb); | |
1223 | return false; | |
1224 | }; | |
7ae934be | 1225 | } |
c637c103 JPM |
1226 | |
1227 | /* tipc_link_input - process packet that has passed link protocol check | |
1228 | * | |
1229 | * Consumes buffer | |
1230 | * Node lock must be held | |
7ae934be | 1231 | */ |
c637c103 | 1232 | static void tipc_link_input(struct tipc_link *link, struct sk_buff *skb) |
7ae934be | 1233 | { |
c637c103 JPM |
1234 | struct tipc_node *node = link->owner; |
1235 | struct tipc_msg *msg = buf_msg(skb); | |
1236 | struct sk_buff *iskb; | |
1237 | int pos = 0; | |
1238 | ||
1239 | if (likely(tipc_data_input(link, skb))) | |
1240 | return; | |
7ae934be EH |
1241 | |
1242 | switch (msg_user(msg)) { | |
c637c103 JPM |
1243 | case CHANGEOVER_PROTOCOL: |
1244 | if (!tipc_link_tunnel_rcv(node, &skb)) | |
1245 | break; | |
1246 | if (msg_user(buf_msg(skb)) != MSG_BUNDLER) { | |
1247 | tipc_data_input(link, skb); | |
1248 | break; | |
1249 | } | |
1250 | case MSG_BUNDLER: | |
1251 | link->stats.recv_bundles++; | |
1252 | link->stats.recv_bundled += msg_msgcnt(msg); | |
1253 | ||
1254 | while (tipc_msg_extract(skb, &iskb, &pos)) | |
1255 | tipc_data_input(link, iskb); | |
7ae934be | 1256 | break; |
c637c103 JPM |
1257 | case MSG_FRAGMENTER: |
1258 | link->stats.recv_fragments++; | |
1259 | if (tipc_buf_append(&link->reasm_buf, &skb)) { | |
1260 | link->stats.recv_fragmented++; | |
1261 | tipc_data_input(link, skb); | |
1262 | } else if (!link->reasm_buf) { | |
1263 | tipc_link_reset(link); | |
1264 | } | |
7ae934be | 1265 | break; |
c637c103 JPM |
1266 | case BCAST_PROTOCOL: |
1267 | tipc_link_sync_rcv(node, skb); | |
7ae934be EH |
1268 | break; |
1269 | default: | |
c637c103 JPM |
1270 | break; |
1271 | }; | |
7ae934be EH |
1272 | } |
1273 | ||
2c53040f | 1274 | /** |
8809b255 AS |
1275 | * tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue |
1276 | * | |
1277 | * Returns increase in queue length (i.e. 0 or 1) | |
b97bf3fd | 1278 | */ |
bc6fecd4 | 1279 | u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb) |
b97bf3fd | 1280 | { |
bc6fecd4 YX |
1281 | struct sk_buff *skb1; |
1282 | u32 seq_no = buf_seqno(skb); | |
b97bf3fd PL |
1283 | |
1284 | /* Empty queue ? */ | |
bc6fecd4 YX |
1285 | if (skb_queue_empty(list)) { |
1286 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1287 | return 1; |
1288 | } | |
1289 | ||
1290 | /* Last ? */ | |
bc6fecd4 YX |
1291 | if (less(buf_seqno(skb_peek_tail(list)), seq_no)) { |
1292 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1293 | return 1; |
1294 | } | |
1295 | ||
8809b255 | 1296 | /* Locate insertion point in queue, then insert; discard if duplicate */ |
bc6fecd4 YX |
1297 | skb_queue_walk(list, skb1) { |
1298 | u32 curr_seqno = buf_seqno(skb1); | |
b97bf3fd | 1299 | |
8809b255 | 1300 | if (seq_no == curr_seqno) { |
bc6fecd4 | 1301 | kfree_skb(skb); |
8809b255 | 1302 | return 0; |
b97bf3fd | 1303 | } |
8809b255 AS |
1304 | |
1305 | if (less(seq_no, curr_seqno)) | |
b97bf3fd | 1306 | break; |
8809b255 | 1307 | } |
b97bf3fd | 1308 | |
bc6fecd4 | 1309 | __skb_queue_before(list, skb1, skb); |
8809b255 | 1310 | return 1; |
b97bf3fd PL |
1311 | } |
1312 | ||
8809b255 | 1313 | /* |
b97bf3fd PL |
1314 | * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet |
1315 | */ | |
c5898636 | 1316 | static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr, |
b97bf3fd PL |
1317 | struct sk_buff *buf) |
1318 | { | |
f905730c | 1319 | u32 seq_no = buf_seqno(buf); |
b97bf3fd PL |
1320 | |
1321 | if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) { | |
c5898636 | 1322 | tipc_link_proto_rcv(l_ptr, buf); |
b97bf3fd PL |
1323 | return; |
1324 | } | |
1325 | ||
b97bf3fd | 1326 | /* Record OOS packet arrival (force mismatch on next timeout) */ |
b97bf3fd PL |
1327 | l_ptr->checkpoint--; |
1328 | ||
c4307285 | 1329 | /* |
b97bf3fd PL |
1330 | * Discard packet if a duplicate; otherwise add it to deferred queue |
1331 | * and notify peer of gap as per protocol specification | |
1332 | */ | |
b97bf3fd PL |
1333 | if (less(seq_no, mod(l_ptr->next_in_no))) { |
1334 | l_ptr->stats.duplicates++; | |
5f6d9123 | 1335 | kfree_skb(buf); |
b97bf3fd PL |
1336 | return; |
1337 | } | |
1338 | ||
bc6fecd4 | 1339 | if (tipc_link_defer_pkt(&l_ptr->deferred_queue, buf)) { |
b97bf3fd | 1340 | l_ptr->stats.deferred_recv++; |
bc6fecd4 | 1341 | if ((skb_queue_len(&l_ptr->deferred_queue) % 16) == 1) |
247f0f3c | 1342 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0); |
bc6fecd4 | 1343 | } else { |
b97bf3fd | 1344 | l_ptr->stats.duplicates++; |
bc6fecd4 | 1345 | } |
b97bf3fd PL |
1346 | } |
1347 | ||
1348 | /* | |
1349 | * Send protocol message to the other endpoint. | |
1350 | */ | |
247f0f3c YX |
1351 | void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg, |
1352 | u32 gap, u32 tolerance, u32 priority, u32 ack_mtu) | |
b97bf3fd | 1353 | { |
1fc54d8f | 1354 | struct sk_buff *buf = NULL; |
b97bf3fd | 1355 | struct tipc_msg *msg = l_ptr->pmsg; |
c4307285 | 1356 | u32 msg_size = sizeof(l_ptr->proto_msg); |
75f0aa49 | 1357 | int r_flag; |
b97bf3fd | 1358 | |
77a7e07a YX |
1359 | /* Don't send protocol message during link changeover */ |
1360 | if (l_ptr->exp_msg_count) | |
b97bf3fd | 1361 | return; |
b4b56102 AS |
1362 | |
1363 | /* Abort non-RESET send if communication with node is prohibited */ | |
10f465c4 | 1364 | if ((tipc_node_blocked(l_ptr->owner)) && (msg_typ != RESET_MSG)) |
b4b56102 AS |
1365 | return; |
1366 | ||
92d2c905 | 1367 | /* Create protocol message with "out-of-sequence" sequence number */ |
b97bf3fd | 1368 | msg_set_type(msg, msg_typ); |
7a2f7d18 | 1369 | msg_set_net_plane(msg, l_ptr->net_plane); |
7a54d4a9 | 1370 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
1da46568 | 1371 | msg_set_last_bcast(msg, tipc_bclink_get_last_sent(l_ptr->owner->net)); |
b97bf3fd PL |
1372 | |
1373 | if (msg_typ == STATE_MSG) { | |
1374 | u32 next_sent = mod(l_ptr->next_out_no); | |
1375 | ||
4323add6 | 1376 | if (!tipc_link_is_up(l_ptr)) |
b97bf3fd PL |
1377 | return; |
1378 | if (l_ptr->next_out) | |
f905730c | 1379 | next_sent = buf_seqno(l_ptr->next_out); |
b97bf3fd | 1380 | msg_set_next_sent(msg, next_sent); |
bc6fecd4 YX |
1381 | if (!skb_queue_empty(&l_ptr->deferred_queue)) { |
1382 | u32 rec = buf_seqno(skb_peek(&l_ptr->deferred_queue)); | |
b97bf3fd PL |
1383 | gap = mod(rec - mod(l_ptr->next_in_no)); |
1384 | } | |
1385 | msg_set_seq_gap(msg, gap); | |
1386 | if (gap) | |
1387 | l_ptr->stats.sent_nacks++; | |
1388 | msg_set_link_tolerance(msg, tolerance); | |
1389 | msg_set_linkprio(msg, priority); | |
1390 | msg_set_max_pkt(msg, ack_mtu); | |
1391 | msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); | |
1392 | msg_set_probe(msg, probe_msg != 0); | |
c4307285 | 1393 | if (probe_msg) { |
b97bf3fd PL |
1394 | u32 mtu = l_ptr->max_pkt; |
1395 | ||
c4307285 | 1396 | if ((mtu < l_ptr->max_pkt_target) && |
b97bf3fd PL |
1397 | link_working_working(l_ptr) && |
1398 | l_ptr->fsm_msg_cnt) { | |
1399 | msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3; | |
c4307285 YH |
1400 | if (l_ptr->max_pkt_probes == 10) { |
1401 | l_ptr->max_pkt_target = (msg_size - 4); | |
1402 | l_ptr->max_pkt_probes = 0; | |
b97bf3fd | 1403 | msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3; |
c4307285 | 1404 | } |
b97bf3fd | 1405 | l_ptr->max_pkt_probes++; |
c4307285 | 1406 | } |
b97bf3fd PL |
1407 | |
1408 | l_ptr->stats.sent_probes++; | |
c4307285 | 1409 | } |
b97bf3fd PL |
1410 | l_ptr->stats.sent_states++; |
1411 | } else { /* RESET_MSG or ACTIVATE_MSG */ | |
1412 | msg_set_ack(msg, mod(l_ptr->reset_checkpoint - 1)); | |
1413 | msg_set_seq_gap(msg, 0); | |
1414 | msg_set_next_sent(msg, 1); | |
f23d9bf2 | 1415 | msg_set_probe(msg, 0); |
b97bf3fd PL |
1416 | msg_set_link_tolerance(msg, l_ptr->tolerance); |
1417 | msg_set_linkprio(msg, l_ptr->priority); | |
1418 | msg_set_max_pkt(msg, l_ptr->max_pkt_target); | |
1419 | } | |
1420 | ||
75f0aa49 AS |
1421 | r_flag = (l_ptr->owner->working_links > tipc_link_is_up(l_ptr)); |
1422 | msg_set_redundant_link(msg, r_flag); | |
b97bf3fd | 1423 | msg_set_linkprio(msg, l_ptr->priority); |
92d2c905 | 1424 | msg_set_size(msg, msg_size); |
b97bf3fd PL |
1425 | |
1426 | msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2))); | |
1427 | ||
31e3c3f6 | 1428 | buf = tipc_buf_acquire(msg_size); |
b97bf3fd PL |
1429 | if (!buf) |
1430 | return; | |
1431 | ||
27d7ff46 | 1432 | skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg)); |
796c75d0 | 1433 | buf->priority = TC_PRIO_CONTROL; |
b97bf3fd | 1434 | |
7f9f95d9 YX |
1435 | tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, buf, |
1436 | &l_ptr->media_addr); | |
92d2c905 | 1437 | l_ptr->unacked_window = 0; |
5f6d9123 | 1438 | kfree_skb(buf); |
b97bf3fd PL |
1439 | } |
1440 | ||
1441 | /* | |
1442 | * Receive protocol message : | |
c4307285 YH |
1443 | * Note that network plane id propagates through the network, and may |
1444 | * change at any time. The node with lowest address rules | |
b97bf3fd | 1445 | */ |
c5898636 | 1446 | static void tipc_link_proto_rcv(struct tipc_link *l_ptr, |
c93d3baa | 1447 | struct sk_buff *buf) |
b97bf3fd PL |
1448 | { |
1449 | u32 rec_gap = 0; | |
1450 | u32 max_pkt_info; | |
c4307285 | 1451 | u32 max_pkt_ack; |
b97bf3fd PL |
1452 | u32 msg_tol; |
1453 | struct tipc_msg *msg = buf_msg(buf); | |
1454 | ||
77a7e07a YX |
1455 | /* Discard protocol message during link changeover */ |
1456 | if (l_ptr->exp_msg_count) | |
b97bf3fd PL |
1457 | goto exit; |
1458 | ||
7a2f7d18 | 1459 | if (l_ptr->net_plane != msg_net_plane(msg)) |
c5898636 | 1460 | if (link_own_addr(l_ptr) > msg_prevnode(msg)) |
7a2f7d18 | 1461 | l_ptr->net_plane = msg_net_plane(msg); |
b97bf3fd | 1462 | |
b97bf3fd | 1463 | switch (msg_type(msg)) { |
c4307285 | 1464 | |
b97bf3fd | 1465 | case RESET_MSG: |
a686e685 AS |
1466 | if (!link_working_unknown(l_ptr) && |
1467 | (l_ptr->peer_session != INVALID_SESSION)) { | |
641c218d AS |
1468 | if (less_eq(msg_session(msg), l_ptr->peer_session)) |
1469 | break; /* duplicate or old reset: ignore */ | |
b97bf3fd | 1470 | } |
b4b56102 AS |
1471 | |
1472 | if (!msg_redundant_link(msg) && (link_working_working(l_ptr) || | |
1473 | link_working_unknown(l_ptr))) { | |
1474 | /* | |
1475 | * peer has lost contact -- don't allow peer's links | |
1476 | * to reactivate before we recognize loss & clean up | |
1477 | */ | |
ca9cf06a | 1478 | l_ptr->owner->action_flags |= TIPC_WAIT_OWN_LINKS_DOWN; |
b4b56102 AS |
1479 | } |
1480 | ||
47361c87 AS |
1481 | link_state_event(l_ptr, RESET_MSG); |
1482 | ||
b97bf3fd PL |
1483 | /* fall thru' */ |
1484 | case ACTIVATE_MSG: | |
1485 | /* Update link settings according other endpoint's values */ | |
b97bf3fd PL |
1486 | strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg)); |
1487 | ||
2db9983a AS |
1488 | msg_tol = msg_link_tolerance(msg); |
1489 | if (msg_tol > l_ptr->tolerance) | |
b97bf3fd PL |
1490 | link_set_supervision_props(l_ptr, msg_tol); |
1491 | ||
1492 | if (msg_linkprio(msg) > l_ptr->priority) | |
1493 | l_ptr->priority = msg_linkprio(msg); | |
1494 | ||
1495 | max_pkt_info = msg_max_pkt(msg); | |
c4307285 | 1496 | if (max_pkt_info) { |
b97bf3fd PL |
1497 | if (max_pkt_info < l_ptr->max_pkt_target) |
1498 | l_ptr->max_pkt_target = max_pkt_info; | |
1499 | if (l_ptr->max_pkt > l_ptr->max_pkt_target) | |
1500 | l_ptr->max_pkt = l_ptr->max_pkt_target; | |
1501 | } else { | |
c4307285 | 1502 | l_ptr->max_pkt = l_ptr->max_pkt_target; |
b97bf3fd | 1503 | } |
b97bf3fd | 1504 | |
4d75313c | 1505 | /* Synchronize broadcast link info, if not done previously */ |
7a54d4a9 AS |
1506 | if (!tipc_node_is_up(l_ptr->owner)) { |
1507 | l_ptr->owner->bclink.last_sent = | |
1508 | l_ptr->owner->bclink.last_in = | |
1509 | msg_last_bcast(msg); | |
1510 | l_ptr->owner->bclink.oos_state = 0; | |
1511 | } | |
4d75313c | 1512 | |
b97bf3fd PL |
1513 | l_ptr->peer_session = msg_session(msg); |
1514 | l_ptr->peer_bearer_id = msg_bearer_id(msg); | |
47361c87 AS |
1515 | |
1516 | if (msg_type(msg) == ACTIVATE_MSG) | |
1517 | link_state_event(l_ptr, ACTIVATE_MSG); | |
b97bf3fd PL |
1518 | break; |
1519 | case STATE_MSG: | |
1520 | ||
2db9983a AS |
1521 | msg_tol = msg_link_tolerance(msg); |
1522 | if (msg_tol) | |
b97bf3fd | 1523 | link_set_supervision_props(l_ptr, msg_tol); |
c4307285 YH |
1524 | |
1525 | if (msg_linkprio(msg) && | |
b97bf3fd | 1526 | (msg_linkprio(msg) != l_ptr->priority)) { |
3fa9cacd EH |
1527 | pr_debug("%s<%s>, priority change %u->%u\n", |
1528 | link_rst_msg, l_ptr->name, | |
1529 | l_ptr->priority, msg_linkprio(msg)); | |
b97bf3fd | 1530 | l_ptr->priority = msg_linkprio(msg); |
4323add6 | 1531 | tipc_link_reset(l_ptr); /* Enforce change to take effect */ |
b97bf3fd PL |
1532 | break; |
1533 | } | |
ec37dcd3 JPM |
1534 | |
1535 | /* Record reception; force mismatch at next timeout: */ | |
1536 | l_ptr->checkpoint--; | |
1537 | ||
b97bf3fd PL |
1538 | link_state_event(l_ptr, TRAFFIC_MSG_EVT); |
1539 | l_ptr->stats.recv_states++; | |
1540 | if (link_reset_unknown(l_ptr)) | |
1541 | break; | |
1542 | ||
1543 | if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) { | |
c4307285 | 1544 | rec_gap = mod(msg_next_sent(msg) - |
b97bf3fd PL |
1545 | mod(l_ptr->next_in_no)); |
1546 | } | |
1547 | ||
1548 | max_pkt_ack = msg_max_pkt(msg); | |
c4307285 | 1549 | if (max_pkt_ack > l_ptr->max_pkt) { |
c4307285 YH |
1550 | l_ptr->max_pkt = max_pkt_ack; |
1551 | l_ptr->max_pkt_probes = 0; | |
1552 | } | |
b97bf3fd PL |
1553 | |
1554 | max_pkt_ack = 0; | |
c4307285 | 1555 | if (msg_probe(msg)) { |
b97bf3fd | 1556 | l_ptr->stats.recv_probes++; |
a016892c | 1557 | if (msg_size(msg) > sizeof(l_ptr->proto_msg)) |
c4307285 | 1558 | max_pkt_ack = msg_size(msg); |
c4307285 | 1559 | } |
b97bf3fd PL |
1560 | |
1561 | /* Protocol message before retransmits, reduce loss risk */ | |
389dd9bc | 1562 | if (l_ptr->owner->bclink.recv_permitted) |
c5898636 | 1563 | tipc_bclink_update_link_state(l_ptr->owner, |
7a54d4a9 | 1564 | msg_last_bcast(msg)); |
b97bf3fd PL |
1565 | |
1566 | if (rec_gap || (msg_probe(msg))) { | |
247f0f3c YX |
1567 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, rec_gap, 0, |
1568 | 0, max_pkt_ack); | |
b97bf3fd PL |
1569 | } |
1570 | if (msg_seq_gap(msg)) { | |
b97bf3fd | 1571 | l_ptr->stats.recv_nacks++; |
58dc55f2 | 1572 | tipc_link_retransmit(l_ptr, skb_peek(&l_ptr->outqueue), |
4323add6 | 1573 | msg_seq_gap(msg)); |
b97bf3fd PL |
1574 | } |
1575 | break; | |
b97bf3fd PL |
1576 | } |
1577 | exit: | |
5f6d9123 | 1578 | kfree_skb(buf); |
b97bf3fd PL |
1579 | } |
1580 | ||
1581 | ||
170b3927 JPM |
1582 | /* tipc_link_tunnel_xmit(): Tunnel one packet via a link belonging to |
1583 | * a different bearer. Owner node is locked. | |
b97bf3fd | 1584 | */ |
170b3927 JPM |
1585 | static void tipc_link_tunnel_xmit(struct tipc_link *l_ptr, |
1586 | struct tipc_msg *tunnel_hdr, | |
1587 | struct tipc_msg *msg, | |
1588 | u32 selector) | |
b97bf3fd | 1589 | { |
a18c4bc3 | 1590 | struct tipc_link *tunnel; |
a6ca1094 | 1591 | struct sk_buff *skb; |
b97bf3fd PL |
1592 | u32 length = msg_size(msg); |
1593 | ||
1594 | tunnel = l_ptr->owner->active_links[selector & 1]; | |
5392d646 | 1595 | if (!tipc_link_is_up(tunnel)) { |
2cf8aa19 | 1596 | pr_warn("%stunnel link no longer available\n", link_co_err); |
b97bf3fd | 1597 | return; |
5392d646 | 1598 | } |
b97bf3fd | 1599 | msg_set_size(tunnel_hdr, length + INT_H_SIZE); |
a6ca1094 YX |
1600 | skb = tipc_buf_acquire(length + INT_H_SIZE); |
1601 | if (!skb) { | |
2cf8aa19 | 1602 | pr_warn("%sunable to send tunnel msg\n", link_co_err); |
b97bf3fd | 1603 | return; |
5392d646 | 1604 | } |
a6ca1094 YX |
1605 | skb_copy_to_linear_data(skb, tunnel_hdr, INT_H_SIZE); |
1606 | skb_copy_to_linear_data_offset(skb, INT_H_SIZE, msg, length); | |
1607 | __tipc_link_xmit_skb(tunnel, skb); | |
b97bf3fd PL |
1608 | } |
1609 | ||
1610 | ||
170b3927 JPM |
1611 | /* tipc_link_failover_send_queue(): A link has gone down, but a second |
1612 | * link is still active. We can do failover. Tunnel the failing link's | |
1613 | * whole send queue via the remaining link. This way, we don't lose | |
1614 | * any packets, and sequence order is preserved for subsequent traffic | |
1615 | * sent over the remaining link. Owner node is locked. | |
b97bf3fd | 1616 | */ |
170b3927 | 1617 | void tipc_link_failover_send_queue(struct tipc_link *l_ptr) |
b97bf3fd | 1618 | { |
58dc55f2 | 1619 | u32 msgcount = skb_queue_len(&l_ptr->outqueue); |
a18c4bc3 | 1620 | struct tipc_link *tunnel = l_ptr->owner->active_links[0]; |
b97bf3fd | 1621 | struct tipc_msg tunnel_hdr; |
58dc55f2 | 1622 | struct sk_buff *skb; |
5392d646 | 1623 | int split_bundles; |
b97bf3fd PL |
1624 | |
1625 | if (!tunnel) | |
1626 | return; | |
1627 | ||
c5898636 | 1628 | tipc_msg_init(link_own_addr(l_ptr), &tunnel_hdr, CHANGEOVER_PROTOCOL, |
34747539 | 1629 | ORIGINAL_MSG, INT_H_SIZE, l_ptr->addr); |
b97bf3fd PL |
1630 | msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id); |
1631 | msg_set_msgcnt(&tunnel_hdr, msgcount); | |
f131072c | 1632 | |
58dc55f2 YX |
1633 | if (skb_queue_empty(&l_ptr->outqueue)) { |
1634 | skb = tipc_buf_acquire(INT_H_SIZE); | |
1635 | if (skb) { | |
1636 | skb_copy_to_linear_data(skb, &tunnel_hdr, INT_H_SIZE); | |
b97bf3fd | 1637 | msg_set_size(&tunnel_hdr, INT_H_SIZE); |
a6ca1094 | 1638 | __tipc_link_xmit_skb(tunnel, skb); |
b97bf3fd | 1639 | } else { |
2cf8aa19 EH |
1640 | pr_warn("%sunable to send changeover msg\n", |
1641 | link_co_err); | |
b97bf3fd PL |
1642 | } |
1643 | return; | |
1644 | } | |
f131072c | 1645 | |
c4307285 | 1646 | split_bundles = (l_ptr->owner->active_links[0] != |
5392d646 AS |
1647 | l_ptr->owner->active_links[1]); |
1648 | ||
58dc55f2 YX |
1649 | skb_queue_walk(&l_ptr->outqueue, skb) { |
1650 | struct tipc_msg *msg = buf_msg(skb); | |
b97bf3fd PL |
1651 | |
1652 | if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) { | |
b97bf3fd | 1653 | struct tipc_msg *m = msg_get_wrapped(msg); |
0e65967e | 1654 | unchar *pos = (unchar *)m; |
b97bf3fd | 1655 | |
d788d805 | 1656 | msgcount = msg_msgcnt(msg); |
b97bf3fd | 1657 | while (msgcount--) { |
0e65967e | 1658 | msg_set_seqno(m, msg_seqno(msg)); |
170b3927 JPM |
1659 | tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, m, |
1660 | msg_link_selector(m)); | |
b97bf3fd PL |
1661 | pos += align(msg_size(m)); |
1662 | m = (struct tipc_msg *)pos; | |
1663 | } | |
1664 | } else { | |
170b3927 JPM |
1665 | tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, msg, |
1666 | msg_link_selector(msg)); | |
b97bf3fd | 1667 | } |
b97bf3fd PL |
1668 | } |
1669 | } | |
1670 | ||
247f0f3c | 1671 | /* tipc_link_dup_queue_xmit(): A second link has become active. Tunnel a |
170b3927 JPM |
1672 | * duplicate of the first link's send queue via the new link. This way, we |
1673 | * are guaranteed that currently queued packets from a socket are delivered | |
1674 | * before future traffic from the same socket, even if this is using the | |
1675 | * new link. The last arriving copy of each duplicate packet is dropped at | |
1676 | * the receiving end by the regular protocol check, so packet cardinality | |
1677 | * and sequence order is preserved per sender/receiver socket pair. | |
1678 | * Owner node is locked. | |
1679 | */ | |
247f0f3c | 1680 | void tipc_link_dup_queue_xmit(struct tipc_link *l_ptr, |
170b3927 | 1681 | struct tipc_link *tunnel) |
b97bf3fd | 1682 | { |
58dc55f2 | 1683 | struct sk_buff *skb; |
b97bf3fd PL |
1684 | struct tipc_msg tunnel_hdr; |
1685 | ||
c5898636 | 1686 | tipc_msg_init(link_own_addr(l_ptr), &tunnel_hdr, CHANGEOVER_PROTOCOL, |
34747539 | 1687 | DUPLICATE_MSG, INT_H_SIZE, l_ptr->addr); |
58dc55f2 | 1688 | msg_set_msgcnt(&tunnel_hdr, skb_queue_len(&l_ptr->outqueue)); |
b97bf3fd | 1689 | msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id); |
58dc55f2 YX |
1690 | skb_queue_walk(&l_ptr->outqueue, skb) { |
1691 | struct sk_buff *outskb; | |
1692 | struct tipc_msg *msg = buf_msg(skb); | |
b97bf3fd PL |
1693 | u32 length = msg_size(msg); |
1694 | ||
1695 | if (msg_user(msg) == MSG_BUNDLER) | |
1696 | msg_set_type(msg, CLOSED_MSG); | |
1697 | msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); /* Update */ | |
c4307285 | 1698 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
b97bf3fd | 1699 | msg_set_size(&tunnel_hdr, length + INT_H_SIZE); |
58dc55f2 YX |
1700 | outskb = tipc_buf_acquire(length + INT_H_SIZE); |
1701 | if (outskb == NULL) { | |
2cf8aa19 EH |
1702 | pr_warn("%sunable to send duplicate msg\n", |
1703 | link_co_err); | |
b97bf3fd PL |
1704 | return; |
1705 | } | |
58dc55f2 YX |
1706 | skb_copy_to_linear_data(outskb, &tunnel_hdr, INT_H_SIZE); |
1707 | skb_copy_to_linear_data_offset(outskb, INT_H_SIZE, skb->data, | |
27d7ff46 | 1708 | length); |
a6ca1094 | 1709 | __tipc_link_xmit_skb(tunnel, outskb); |
4323add6 | 1710 | if (!tipc_link_is_up(l_ptr)) |
b97bf3fd | 1711 | return; |
b97bf3fd PL |
1712 | } |
1713 | } | |
1714 | ||
1dab3d5a JPM |
1715 | /* tipc_link_dup_rcv(): Receive a tunnelled DUPLICATE_MSG packet. |
1716 | * Owner node is locked. | |
1717 | */ | |
c1336ee4 JPM |
1718 | static void tipc_link_dup_rcv(struct tipc_link *link, |
1719 | struct sk_buff *skb) | |
1dab3d5a | 1720 | { |
c1336ee4 JPM |
1721 | struct sk_buff *iskb; |
1722 | int pos = 0; | |
1dab3d5a | 1723 | |
c1336ee4 | 1724 | if (!tipc_link_is_up(link)) |
1dab3d5a JPM |
1725 | return; |
1726 | ||
c1336ee4 | 1727 | if (!tipc_msg_extract(skb, &iskb, &pos)) { |
1dab3d5a JPM |
1728 | pr_warn("%sfailed to extract inner dup pkt\n", link_co_err); |
1729 | return; | |
1730 | } | |
c1336ee4 JPM |
1731 | /* Append buffer to deferred queue, if applicable: */ |
1732 | link_handle_out_of_seq_msg(link, iskb); | |
1dab3d5a JPM |
1733 | } |
1734 | ||
f006c9c7 JPM |
1735 | /* tipc_link_failover_rcv(): Receive a tunnelled ORIGINAL_MSG packet |
1736 | * Owner node is locked. | |
1737 | */ | |
1738 | static struct sk_buff *tipc_link_failover_rcv(struct tipc_link *l_ptr, | |
1739 | struct sk_buff *t_buf) | |
1740 | { | |
1741 | struct tipc_msg *t_msg = buf_msg(t_buf); | |
1742 | struct sk_buff *buf = NULL; | |
1743 | struct tipc_msg *msg; | |
c1336ee4 | 1744 | int pos = 0; |
f006c9c7 JPM |
1745 | |
1746 | if (tipc_link_is_up(l_ptr)) | |
1747 | tipc_link_reset(l_ptr); | |
1748 | ||
1749 | /* First failover packet? */ | |
1750 | if (l_ptr->exp_msg_count == START_CHANGEOVER) | |
1751 | l_ptr->exp_msg_count = msg_msgcnt(t_msg); | |
1752 | ||
1753 | /* Should there be an inner packet? */ | |
1754 | if (l_ptr->exp_msg_count) { | |
1755 | l_ptr->exp_msg_count--; | |
c1336ee4 | 1756 | if (!tipc_msg_extract(t_buf, &buf, &pos)) { |
f006c9c7 JPM |
1757 | pr_warn("%sno inner failover pkt\n", link_co_err); |
1758 | goto exit; | |
1759 | } | |
1760 | msg = buf_msg(buf); | |
1761 | ||
1762 | if (less(msg_seqno(msg), l_ptr->reset_checkpoint)) { | |
1763 | kfree_skb(buf); | |
1764 | buf = NULL; | |
1765 | goto exit; | |
1766 | } | |
1767 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
1768 | l_ptr->stats.recv_fragments++; | |
37e22164 | 1769 | tipc_buf_append(&l_ptr->reasm_buf, &buf); |
f006c9c7 JPM |
1770 | } |
1771 | } | |
f006c9c7 | 1772 | exit: |
2d72d495 JPM |
1773 | if ((!l_ptr->exp_msg_count) && (l_ptr->flags & LINK_STOPPED)) |
1774 | tipc_link_delete(l_ptr); | |
f006c9c7 JPM |
1775 | return buf; |
1776 | } | |
1777 | ||
1dab3d5a | 1778 | /* tipc_link_tunnel_rcv(): Receive a tunnelled packet, sent |
170b3927 JPM |
1779 | * via other link as result of a failover (ORIGINAL_MSG) or |
1780 | * a new active link (DUPLICATE_MSG). Failover packets are | |
1781 | * returned to the active link for delivery upwards. | |
1782 | * Owner node is locked. | |
b97bf3fd | 1783 | */ |
c5898636 | 1784 | static int tipc_link_tunnel_rcv(struct tipc_node *n_ptr, |
170b3927 | 1785 | struct sk_buff **buf) |
b97bf3fd | 1786 | { |
02842f71 JPM |
1787 | struct sk_buff *t_buf = *buf; |
1788 | struct tipc_link *l_ptr; | |
1789 | struct tipc_msg *t_msg = buf_msg(t_buf); | |
1790 | u32 bearer_id = msg_bearer_id(t_msg); | |
b97bf3fd | 1791 | |
1e9d47a9 JPM |
1792 | *buf = NULL; |
1793 | ||
cb4b102f DC |
1794 | if (bearer_id >= MAX_BEARERS) |
1795 | goto exit; | |
1dab3d5a | 1796 | |
02842f71 JPM |
1797 | l_ptr = n_ptr->links[bearer_id]; |
1798 | if (!l_ptr) | |
b97bf3fd | 1799 | goto exit; |
b97bf3fd | 1800 | |
02842f71 | 1801 | if (msg_type(t_msg) == DUPLICATE_MSG) |
c5898636 | 1802 | tipc_link_dup_rcv(l_ptr, t_buf); |
02842f71 JPM |
1803 | else if (msg_type(t_msg) == ORIGINAL_MSG) |
1804 | *buf = tipc_link_failover_rcv(l_ptr, t_buf); | |
1e9d47a9 JPM |
1805 | else |
1806 | pr_warn("%sunknown tunnel pkt received\n", link_co_err); | |
b97bf3fd | 1807 | exit: |
02842f71 | 1808 | kfree_skb(t_buf); |
1e9d47a9 | 1809 | return *buf != NULL; |
b97bf3fd PL |
1810 | } |
1811 | ||
2f55c437 | 1812 | static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol) |
b97bf3fd | 1813 | { |
2f55c437 YX |
1814 | unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4; |
1815 | ||
1816 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
5413b4c6 AS |
1817 | return; |
1818 | ||
2f55c437 YX |
1819 | l_ptr->tolerance = tol; |
1820 | l_ptr->cont_intv = msecs_to_jiffies(intv); | |
1821 | l_ptr->abort_limit = tol / (jiffies_to_msecs(l_ptr->cont_intv) / 4); | |
b97bf3fd PL |
1822 | } |
1823 | ||
a18c4bc3 | 1824 | void tipc_link_set_queue_limits(struct tipc_link *l_ptr, u32 window) |
b97bf3fd PL |
1825 | { |
1826 | /* Data messages from this node, inclusive FIRST_FRAGM */ | |
06d82c91 AS |
1827 | l_ptr->queue_limit[TIPC_LOW_IMPORTANCE] = window; |
1828 | l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE] = (window / 3) * 4; | |
1829 | l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE] = (window / 3) * 5; | |
1830 | l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE] = (window / 3) * 6; | |
b97bf3fd | 1831 | /* Transiting data messages,inclusive FIRST_FRAGM */ |
06d82c91 AS |
1832 | l_ptr->queue_limit[TIPC_LOW_IMPORTANCE + 4] = 300; |
1833 | l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE + 4] = 600; | |
1834 | l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE + 4] = 900; | |
1835 | l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE + 4] = 1200; | |
b97bf3fd | 1836 | l_ptr->queue_limit[CONN_MANAGER] = 1200; |
b97bf3fd PL |
1837 | l_ptr->queue_limit[CHANGEOVER_PROTOCOL] = 2500; |
1838 | l_ptr->queue_limit[NAME_DISTRIBUTOR] = 3000; | |
1839 | /* FRAGMENT and LAST_FRAGMENT packets */ | |
1840 | l_ptr->queue_limit[MSG_FRAGMENTER] = 4000; | |
1841 | } | |
1842 | ||
e099e86c | 1843 | /* tipc_link_find_owner - locate owner node of link by link's name |
f2f9800d | 1844 | * @net: the applicable net namespace |
e099e86c JPM |
1845 | * @name: pointer to link name string |
1846 | * @bearer_id: pointer to index in 'node->links' array where the link was found. | |
c4307285 | 1847 | * |
e099e86c | 1848 | * Returns pointer to node owning the link, or 0 if no matching link is found. |
b97bf3fd | 1849 | */ |
f2f9800d YX |
1850 | static struct tipc_node *tipc_link_find_owner(struct net *net, |
1851 | const char *link_name, | |
e099e86c | 1852 | unsigned int *bearer_id) |
b97bf3fd | 1853 | { |
f2f9800d | 1854 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
a18c4bc3 | 1855 | struct tipc_link *l_ptr; |
bbfbe47c | 1856 | struct tipc_node *n_ptr; |
886eaa1f | 1857 | struct tipc_node *found_node = NULL; |
bbfbe47c | 1858 | int i; |
b97bf3fd | 1859 | |
e099e86c | 1860 | *bearer_id = 0; |
6c7a762e | 1861 | rcu_read_lock(); |
f2f9800d | 1862 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
a11607f5 | 1863 | tipc_node_lock(n_ptr); |
bbfbe47c EH |
1864 | for (i = 0; i < MAX_BEARERS; i++) { |
1865 | l_ptr = n_ptr->links[i]; | |
e099e86c JPM |
1866 | if (l_ptr && !strcmp(l_ptr->name, link_name)) { |
1867 | *bearer_id = i; | |
1868 | found_node = n_ptr; | |
1869 | break; | |
1870 | } | |
bbfbe47c | 1871 | } |
a11607f5 | 1872 | tipc_node_unlock(n_ptr); |
e099e86c JPM |
1873 | if (found_node) |
1874 | break; | |
bbfbe47c | 1875 | } |
6c7a762e YX |
1876 | rcu_read_unlock(); |
1877 | ||
e099e86c | 1878 | return found_node; |
b97bf3fd PL |
1879 | } |
1880 | ||
b97bf3fd PL |
1881 | /** |
1882 | * link_reset_statistics - reset link statistics | |
1883 | * @l_ptr: pointer to link | |
1884 | */ | |
a18c4bc3 | 1885 | static void link_reset_statistics(struct tipc_link *l_ptr) |
b97bf3fd PL |
1886 | { |
1887 | memset(&l_ptr->stats, 0, sizeof(l_ptr->stats)); | |
1888 | l_ptr->stats.sent_info = l_ptr->next_out_no; | |
1889 | l_ptr->stats.recv_info = l_ptr->next_in_no; | |
1890 | } | |
1891 | ||
a18c4bc3 | 1892 | static void link_print(struct tipc_link *l_ptr, const char *str) |
b97bf3fd | 1893 | { |
7f9f95d9 | 1894 | struct tipc_net *tn = net_generic(l_ptr->owner->net, tipc_net_id); |
7a2f7d18 YX |
1895 | struct tipc_bearer *b_ptr; |
1896 | ||
1897 | rcu_read_lock(); | |
7f9f95d9 | 1898 | b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]); |
7a2f7d18 YX |
1899 | if (b_ptr) |
1900 | pr_info("%s Link %x<%s>:", str, l_ptr->addr, b_ptr->name); | |
1901 | rcu_read_unlock(); | |
8d64a5ba | 1902 | |
b97bf3fd | 1903 | if (link_working_unknown(l_ptr)) |
5deedde9 | 1904 | pr_cont(":WU\n"); |
8d64a5ba | 1905 | else if (link_reset_reset(l_ptr)) |
5deedde9 | 1906 | pr_cont(":RR\n"); |
8d64a5ba | 1907 | else if (link_reset_unknown(l_ptr)) |
5deedde9 | 1908 | pr_cont(":RU\n"); |
8d64a5ba | 1909 | else if (link_working_working(l_ptr)) |
5deedde9 PG |
1910 | pr_cont(":WW\n"); |
1911 | else | |
1912 | pr_cont("\n"); | |
b97bf3fd | 1913 | } |
0655f6a8 RA |
1914 | |
1915 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
1916 | */ | |
1917 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
1918 | { | |
1919 | int err; | |
1920 | ||
1921 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
1922 | tipc_nl_prop_policy); | |
1923 | if (err) | |
1924 | return err; | |
1925 | ||
1926 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1927 | u32 prio; | |
1928 | ||
1929 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1930 | if (prio > TIPC_MAX_LINK_PRI) | |
1931 | return -EINVAL; | |
1932 | } | |
1933 | ||
1934 | if (props[TIPC_NLA_PROP_TOL]) { | |
1935 | u32 tol; | |
1936 | ||
1937 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1938 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
1939 | return -EINVAL; | |
1940 | } | |
1941 | ||
1942 | if (props[TIPC_NLA_PROP_WIN]) { | |
1943 | u32 win; | |
1944 | ||
1945 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1946 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
1947 | return -EINVAL; | |
1948 | } | |
1949 | ||
1950 | return 0; | |
1951 | } | |
7be57fc6 | 1952 | |
f96ce7a2 RA |
1953 | int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info) |
1954 | { | |
1955 | int err; | |
1956 | int res = 0; | |
1957 | int bearer_id; | |
1958 | char *name; | |
1959 | struct tipc_link *link; | |
1960 | struct tipc_node *node; | |
1961 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
37e2d484 | 1962 | struct net *net = sock_net(skb->sk); |
f96ce7a2 RA |
1963 | |
1964 | if (!info->attrs[TIPC_NLA_LINK]) | |
1965 | return -EINVAL; | |
1966 | ||
1967 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
1968 | info->attrs[TIPC_NLA_LINK], | |
1969 | tipc_nl_link_policy); | |
1970 | if (err) | |
1971 | return err; | |
1972 | ||
1973 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
1974 | return -EINVAL; | |
1975 | ||
1976 | name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
1977 | ||
f2f9800d | 1978 | node = tipc_link_find_owner(net, name, &bearer_id); |
f96ce7a2 RA |
1979 | if (!node) |
1980 | return -EINVAL; | |
1981 | ||
1982 | tipc_node_lock(node); | |
1983 | ||
1984 | link = node->links[bearer_id]; | |
1985 | if (!link) { | |
1986 | res = -EINVAL; | |
1987 | goto out; | |
1988 | } | |
1989 | ||
1990 | if (attrs[TIPC_NLA_LINK_PROP]) { | |
1991 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; | |
1992 | ||
1993 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], | |
1994 | props); | |
1995 | if (err) { | |
1996 | res = err; | |
1997 | goto out; | |
1998 | } | |
1999 | ||
2000 | if (props[TIPC_NLA_PROP_TOL]) { | |
2001 | u32 tol; | |
2002 | ||
2003 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
2004 | link_set_supervision_props(link, tol); | |
2005 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0, 0); | |
2006 | } | |
2007 | if (props[TIPC_NLA_PROP_PRIO]) { | |
2008 | u32 prio; | |
2009 | ||
2010 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
2011 | link->priority = prio; | |
2012 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio, 0); | |
2013 | } | |
2014 | if (props[TIPC_NLA_PROP_WIN]) { | |
2015 | u32 win; | |
2016 | ||
2017 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
2018 | tipc_link_set_queue_limits(link, win); | |
2019 | } | |
2020 | } | |
2021 | ||
2022 | out: | |
2023 | tipc_node_unlock(node); | |
2024 | ||
2025 | return res; | |
2026 | } | |
d8182804 RA |
2027 | |
2028 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) | |
7be57fc6 RA |
2029 | { |
2030 | int i; | |
2031 | struct nlattr *stats; | |
2032 | ||
2033 | struct nla_map { | |
2034 | u32 key; | |
2035 | u32 val; | |
2036 | }; | |
2037 | ||
2038 | struct nla_map map[] = { | |
2039 | {TIPC_NLA_STATS_RX_INFO, s->recv_info}, | |
2040 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, | |
2041 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
2042 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
2043 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
2044 | {TIPC_NLA_STATS_TX_INFO, s->sent_info}, | |
2045 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, | |
2046 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
2047 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
2048 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
2049 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
2050 | s->msg_length_counts : 1}, | |
2051 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
2052 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
2053 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
2054 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
2055 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
2056 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
2057 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
2058 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
2059 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
2060 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
2061 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
2062 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
2063 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
2064 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
2065 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
2066 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
2067 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
2068 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
2069 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
2070 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
2071 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
2072 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
2073 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
2074 | }; | |
2075 | ||
2076 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
2077 | if (!stats) | |
2078 | return -EMSGSIZE; | |
2079 | ||
2080 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
2081 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
2082 | goto msg_full; | |
2083 | ||
2084 | nla_nest_end(skb, stats); | |
2085 | ||
2086 | return 0; | |
2087 | msg_full: | |
2088 | nla_nest_cancel(skb, stats); | |
2089 | ||
2090 | return -EMSGSIZE; | |
2091 | } | |
2092 | ||
2093 | /* Caller should hold appropriate locks to protect the link */ | |
34747539 YX |
2094 | static int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
2095 | struct tipc_link *link) | |
7be57fc6 RA |
2096 | { |
2097 | int err; | |
2098 | void *hdr; | |
2099 | struct nlattr *attrs; | |
2100 | struct nlattr *prop; | |
34747539 | 2101 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
7be57fc6 | 2102 | |
bfb3e5dd | 2103 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
7be57fc6 RA |
2104 | NLM_F_MULTI, TIPC_NL_LINK_GET); |
2105 | if (!hdr) | |
2106 | return -EMSGSIZE; | |
2107 | ||
2108 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
2109 | if (!attrs) | |
2110 | goto msg_full; | |
2111 | ||
2112 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
2113 | goto attr_msg_full; | |
2114 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, | |
34747539 | 2115 | tipc_cluster_mask(tn->own_addr))) |
7be57fc6 RA |
2116 | goto attr_msg_full; |
2117 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->max_pkt)) | |
2118 | goto attr_msg_full; | |
2119 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->next_in_no)) | |
2120 | goto attr_msg_full; | |
2121 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->next_out_no)) | |
2122 | goto attr_msg_full; | |
2123 | ||
2124 | if (tipc_link_is_up(link)) | |
2125 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2126 | goto attr_msg_full; | |
2127 | if (tipc_link_is_active(link)) | |
2128 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) | |
2129 | goto attr_msg_full; | |
2130 | ||
2131 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
2132 | if (!prop) | |
2133 | goto attr_msg_full; | |
2134 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2135 | goto prop_msg_full; | |
2136 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
2137 | goto prop_msg_full; | |
2138 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
2139 | link->queue_limit[TIPC_LOW_IMPORTANCE])) | |
2140 | goto prop_msg_full; | |
2141 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2142 | goto prop_msg_full; | |
2143 | nla_nest_end(msg->skb, prop); | |
2144 | ||
2145 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
2146 | if (err) | |
2147 | goto attr_msg_full; | |
2148 | ||
2149 | nla_nest_end(msg->skb, attrs); | |
2150 | genlmsg_end(msg->skb, hdr); | |
2151 | ||
2152 | return 0; | |
2153 | ||
2154 | prop_msg_full: | |
2155 | nla_nest_cancel(msg->skb, prop); | |
2156 | attr_msg_full: | |
2157 | nla_nest_cancel(msg->skb, attrs); | |
2158 | msg_full: | |
2159 | genlmsg_cancel(msg->skb, hdr); | |
2160 | ||
2161 | return -EMSGSIZE; | |
2162 | } | |
2163 | ||
2164 | /* Caller should hold node lock */ | |
34747539 YX |
2165 | static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg, |
2166 | struct tipc_node *node, u32 *prev_link) | |
7be57fc6 RA |
2167 | { |
2168 | u32 i; | |
2169 | int err; | |
2170 | ||
2171 | for (i = *prev_link; i < MAX_BEARERS; i++) { | |
2172 | *prev_link = i; | |
2173 | ||
2174 | if (!node->links[i]) | |
2175 | continue; | |
2176 | ||
34747539 | 2177 | err = __tipc_nl_add_link(net, msg, node->links[i]); |
7be57fc6 RA |
2178 | if (err) |
2179 | return err; | |
2180 | } | |
2181 | *prev_link = 0; | |
2182 | ||
2183 | return 0; | |
2184 | } | |
2185 | ||
2186 | int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2187 | { | |
f2f9800d YX |
2188 | struct net *net = sock_net(skb->sk); |
2189 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
7be57fc6 RA |
2190 | struct tipc_node *node; |
2191 | struct tipc_nl_msg msg; | |
2192 | u32 prev_node = cb->args[0]; | |
2193 | u32 prev_link = cb->args[1]; | |
2194 | int done = cb->args[2]; | |
2195 | int err; | |
2196 | ||
2197 | if (done) | |
2198 | return 0; | |
2199 | ||
2200 | msg.skb = skb; | |
2201 | msg.portid = NETLINK_CB(cb->skb).portid; | |
2202 | msg.seq = cb->nlh->nlmsg_seq; | |
2203 | ||
2204 | rcu_read_lock(); | |
2205 | ||
2206 | if (prev_node) { | |
f2f9800d | 2207 | node = tipc_node_find(net, prev_node); |
7be57fc6 RA |
2208 | if (!node) { |
2209 | /* We never set seq or call nl_dump_check_consistent() | |
2210 | * this means that setting prev_seq here will cause the | |
2211 | * consistence check to fail in the netlink callback | |
2212 | * handler. Resulting in the last NLMSG_DONE message | |
2213 | * having the NLM_F_DUMP_INTR flag set. | |
2214 | */ | |
2215 | cb->prev_seq = 1; | |
2216 | goto out; | |
2217 | } | |
2218 | ||
f2f9800d YX |
2219 | list_for_each_entry_continue_rcu(node, &tn->node_list, |
2220 | list) { | |
7be57fc6 | 2221 | tipc_node_lock(node); |
34747539 YX |
2222 | err = __tipc_nl_add_node_links(net, &msg, node, |
2223 | &prev_link); | |
7be57fc6 RA |
2224 | tipc_node_unlock(node); |
2225 | if (err) | |
2226 | goto out; | |
2227 | ||
2228 | prev_node = node->addr; | |
2229 | } | |
2230 | } else { | |
1da46568 | 2231 | err = tipc_nl_add_bc_link(net, &msg); |
7be57fc6 RA |
2232 | if (err) |
2233 | goto out; | |
2234 | ||
f2f9800d | 2235 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
7be57fc6 | 2236 | tipc_node_lock(node); |
34747539 YX |
2237 | err = __tipc_nl_add_node_links(net, &msg, node, |
2238 | &prev_link); | |
7be57fc6 RA |
2239 | tipc_node_unlock(node); |
2240 | if (err) | |
2241 | goto out; | |
2242 | ||
2243 | prev_node = node->addr; | |
2244 | } | |
2245 | } | |
2246 | done = 1; | |
2247 | out: | |
2248 | rcu_read_unlock(); | |
2249 | ||
2250 | cb->args[0] = prev_node; | |
2251 | cb->args[1] = prev_link; | |
2252 | cb->args[2] = done; | |
2253 | ||
2254 | return skb->len; | |
2255 | } | |
2256 | ||
2257 | int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info) | |
2258 | { | |
f2f9800d | 2259 | struct net *net = genl_info_net(info); |
7be57fc6 RA |
2260 | struct sk_buff *ans_skb; |
2261 | struct tipc_nl_msg msg; | |
2262 | struct tipc_link *link; | |
2263 | struct tipc_node *node; | |
2264 | char *name; | |
2265 | int bearer_id; | |
2266 | int err; | |
2267 | ||
2268 | if (!info->attrs[TIPC_NLA_LINK_NAME]) | |
2269 | return -EINVAL; | |
2270 | ||
2271 | name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]); | |
f2f9800d | 2272 | node = tipc_link_find_owner(net, name, &bearer_id); |
7be57fc6 RA |
2273 | if (!node) |
2274 | return -EINVAL; | |
2275 | ||
2276 | ans_skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
2277 | if (!ans_skb) | |
2278 | return -ENOMEM; | |
2279 | ||
2280 | msg.skb = ans_skb; | |
2281 | msg.portid = info->snd_portid; | |
2282 | msg.seq = info->snd_seq; | |
2283 | ||
2284 | tipc_node_lock(node); | |
2285 | link = node->links[bearer_id]; | |
2286 | if (!link) { | |
2287 | err = -EINVAL; | |
2288 | goto err_out; | |
2289 | } | |
2290 | ||
34747539 | 2291 | err = __tipc_nl_add_link(net, &msg, link); |
7be57fc6 RA |
2292 | if (err) |
2293 | goto err_out; | |
2294 | ||
2295 | tipc_node_unlock(node); | |
2296 | ||
2297 | return genlmsg_reply(ans_skb, info); | |
2298 | ||
2299 | err_out: | |
2300 | tipc_node_unlock(node); | |
2301 | nlmsg_free(ans_skb); | |
2302 | ||
2303 | return err; | |
2304 | } | |
ae36342b RA |
2305 | |
2306 | int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info) | |
2307 | { | |
2308 | int err; | |
2309 | char *link_name; | |
2310 | unsigned int bearer_id; | |
2311 | struct tipc_link *link; | |
2312 | struct tipc_node *node; | |
2313 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
1817877b | 2314 | struct net *net = sock_net(skb->sk); |
ae36342b RA |
2315 | |
2316 | if (!info->attrs[TIPC_NLA_LINK]) | |
2317 | return -EINVAL; | |
2318 | ||
2319 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
2320 | info->attrs[TIPC_NLA_LINK], | |
2321 | tipc_nl_link_policy); | |
2322 | if (err) | |
2323 | return err; | |
2324 | ||
2325 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
2326 | return -EINVAL; | |
2327 | ||
2328 | link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
2329 | ||
2330 | if (strcmp(link_name, tipc_bclink_name) == 0) { | |
1da46568 | 2331 | err = tipc_bclink_reset_stats(net); |
ae36342b RA |
2332 | if (err) |
2333 | return err; | |
2334 | return 0; | |
2335 | } | |
2336 | ||
f2f9800d | 2337 | node = tipc_link_find_owner(net, link_name, &bearer_id); |
ae36342b RA |
2338 | if (!node) |
2339 | return -EINVAL; | |
2340 | ||
2341 | tipc_node_lock(node); | |
2342 | ||
2343 | link = node->links[bearer_id]; | |
2344 | if (!link) { | |
2345 | tipc_node_unlock(node); | |
2346 | return -EINVAL; | |
2347 | } | |
2348 | ||
2349 | link_reset_statistics(link); | |
2350 | ||
2351 | tipc_node_unlock(node); | |
2352 | ||
2353 | return 0; | |
2354 | } |