Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/link.c: TIPC link code | |
c4307285 | 3 | * |
c1336ee4 | 4 | * Copyright (c) 1996-2007, 2012-2015, Ericsson AB |
198d73b8 | 5 | * Copyright (c) 2004-2007, 2010-2013, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the names of the copyright holders nor the names of its | |
17 | * contributors may be used to endorse or promote products derived from | |
18 | * this software without specific prior written permission. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
20 | * Alternatively, this software may be distributed under the terms of the |
21 | * GNU General Public License ("GPL") version 2 as published by the Free | |
22 | * Software Foundation. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
37 | #include "core.h" | |
e3eea1eb | 38 | #include "subscr.h" |
b97bf3fd | 39 | #include "link.h" |
7be57fc6 | 40 | #include "bcast.h" |
9816f061 | 41 | #include "socket.h" |
b97bf3fd | 42 | #include "name_distr.h" |
b97bf3fd | 43 | #include "discover.h" |
0655f6a8 | 44 | #include "netlink.h" |
b97bf3fd | 45 | |
796c75d0 YX |
46 | #include <linux/pkt_sched.h> |
47 | ||
2cf8aa19 EH |
48 | /* |
49 | * Error message prefixes | |
50 | */ | |
51 | static const char *link_co_err = "Link changeover error, "; | |
52 | static const char *link_rst_msg = "Resetting link "; | |
53 | static const char *link_unk_evt = "Unknown link event "; | |
b97bf3fd | 54 | |
7be57fc6 RA |
55 | static const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = { |
56 | [TIPC_NLA_LINK_UNSPEC] = { .type = NLA_UNSPEC }, | |
57 | [TIPC_NLA_LINK_NAME] = { | |
58 | .type = NLA_STRING, | |
59 | .len = TIPC_MAX_LINK_NAME | |
60 | }, | |
61 | [TIPC_NLA_LINK_MTU] = { .type = NLA_U32 }, | |
62 | [TIPC_NLA_LINK_BROADCAST] = { .type = NLA_FLAG }, | |
63 | [TIPC_NLA_LINK_UP] = { .type = NLA_FLAG }, | |
64 | [TIPC_NLA_LINK_ACTIVE] = { .type = NLA_FLAG }, | |
65 | [TIPC_NLA_LINK_PROP] = { .type = NLA_NESTED }, | |
66 | [TIPC_NLA_LINK_STATS] = { .type = NLA_NESTED }, | |
67 | [TIPC_NLA_LINK_RX] = { .type = NLA_U32 }, | |
68 | [TIPC_NLA_LINK_TX] = { .type = NLA_U32 } | |
69 | }; | |
70 | ||
0655f6a8 RA |
71 | /* Properties valid for media, bearar and link */ |
72 | static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = { | |
73 | [TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC }, | |
74 | [TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 }, | |
75 | [TIPC_NLA_PROP_TOL] = { .type = NLA_U32 }, | |
76 | [TIPC_NLA_PROP_WIN] = { .type = NLA_U32 } | |
77 | }; | |
78 | ||
a686e685 AS |
79 | /* |
80 | * Out-of-range value for link session numbers | |
81 | */ | |
a686e685 AS |
82 | #define INVALID_SESSION 0x10000 |
83 | ||
c4307285 YH |
84 | /* |
85 | * Link state events: | |
b97bf3fd | 86 | */ |
b97bf3fd PL |
87 | #define STARTING_EVT 856384768 /* link processing trigger */ |
88 | #define TRAFFIC_MSG_EVT 560815u /* rx'd ??? */ | |
89 | #define TIMEOUT_EVT 560817u /* link timer expired */ | |
90 | ||
c4307285 YH |
91 | /* |
92 | * The following two 'message types' is really just implementation | |
93 | * data conveniently stored in the message header. | |
b97bf3fd PL |
94 | * They must not be considered part of the protocol |
95 | */ | |
96 | #define OPEN_MSG 0 | |
97 | #define CLOSED_MSG 1 | |
98 | ||
c4307285 | 99 | /* |
b97bf3fd PL |
100 | * State value stored in 'exp_msg_count' |
101 | */ | |
b97bf3fd PL |
102 | #define START_CHANGEOVER 100000u |
103 | ||
c5898636 JPM |
104 | static void link_handle_out_of_seq_msg(struct tipc_link *link, |
105 | struct sk_buff *skb); | |
106 | static void tipc_link_proto_rcv(struct tipc_link *link, | |
107 | struct sk_buff *skb); | |
108 | static int tipc_link_tunnel_rcv(struct tipc_node *node, | |
109 | struct sk_buff **skb); | |
2f55c437 | 110 | static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol); |
a18c4bc3 PG |
111 | static void link_state_event(struct tipc_link *l_ptr, u32 event); |
112 | static void link_reset_statistics(struct tipc_link *l_ptr); | |
113 | static void link_print(struct tipc_link *l_ptr, const char *str); | |
247f0f3c YX |
114 | static void tipc_link_sync_xmit(struct tipc_link *l); |
115 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf); | |
c637c103 JPM |
116 | static void tipc_link_input(struct tipc_link *l, struct sk_buff *skb); |
117 | static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb); | |
31e3c3f6 | 118 | |
b97bf3fd | 119 | /* |
05790c64 | 120 | * Simple link routines |
b97bf3fd | 121 | */ |
05790c64 | 122 | static unsigned int align(unsigned int i) |
b97bf3fd PL |
123 | { |
124 | return (i + 3) & ~3u; | |
125 | } | |
126 | ||
2d72d495 JPM |
127 | static void tipc_link_release(struct kref *kref) |
128 | { | |
129 | kfree(container_of(kref, struct tipc_link, ref)); | |
130 | } | |
131 | ||
132 | static void tipc_link_get(struct tipc_link *l_ptr) | |
133 | { | |
134 | kref_get(&l_ptr->ref); | |
135 | } | |
136 | ||
137 | static void tipc_link_put(struct tipc_link *l_ptr) | |
138 | { | |
139 | kref_put(&l_ptr->ref, tipc_link_release); | |
140 | } | |
141 | ||
a18c4bc3 | 142 | static void link_init_max_pkt(struct tipc_link *l_ptr) |
b97bf3fd | 143 | { |
7f9f95d9 YX |
144 | struct tipc_node *node = l_ptr->owner; |
145 | struct tipc_net *tn = net_generic(node->net, tipc_net_id); | |
7a2f7d18 | 146 | struct tipc_bearer *b_ptr; |
b97bf3fd | 147 | u32 max_pkt; |
c4307285 | 148 | |
7a2f7d18 | 149 | rcu_read_lock(); |
7f9f95d9 | 150 | b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]); |
7a2f7d18 YX |
151 | if (!b_ptr) { |
152 | rcu_read_unlock(); | |
153 | return; | |
154 | } | |
155 | max_pkt = (b_ptr->mtu & ~3); | |
156 | rcu_read_unlock(); | |
157 | ||
b97bf3fd PL |
158 | if (max_pkt > MAX_MSG_SIZE) |
159 | max_pkt = MAX_MSG_SIZE; | |
160 | ||
c4307285 | 161 | l_ptr->max_pkt_target = max_pkt; |
b97bf3fd PL |
162 | if (l_ptr->max_pkt_target < MAX_PKT_DEFAULT) |
163 | l_ptr->max_pkt = l_ptr->max_pkt_target; | |
c4307285 | 164 | else |
b97bf3fd PL |
165 | l_ptr->max_pkt = MAX_PKT_DEFAULT; |
166 | ||
c4307285 | 167 | l_ptr->max_pkt_probes = 0; |
b97bf3fd PL |
168 | } |
169 | ||
b97bf3fd | 170 | /* |
05790c64 | 171 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 172 | */ |
a18c4bc3 | 173 | int tipc_link_is_up(struct tipc_link *l_ptr) |
b97bf3fd PL |
174 | { |
175 | if (!l_ptr) | |
176 | return 0; | |
a02cec21 | 177 | return link_working_working(l_ptr) || link_working_unknown(l_ptr); |
b97bf3fd PL |
178 | } |
179 | ||
a18c4bc3 | 180 | int tipc_link_is_active(struct tipc_link *l_ptr) |
b97bf3fd | 181 | { |
a02cec21 ED |
182 | return (l_ptr->owner->active_links[0] == l_ptr) || |
183 | (l_ptr->owner->active_links[1] == l_ptr); | |
b97bf3fd PL |
184 | } |
185 | ||
b97bf3fd PL |
186 | /** |
187 | * link_timeout - handle expiration of link timer | |
188 | * @l_ptr: pointer to link | |
b97bf3fd | 189 | */ |
2f55c437 | 190 | static void link_timeout(unsigned long data) |
b97bf3fd | 191 | { |
2f55c437 | 192 | struct tipc_link *l_ptr = (struct tipc_link *)data; |
58dc55f2 YX |
193 | struct sk_buff *skb; |
194 | ||
4323add6 | 195 | tipc_node_lock(l_ptr->owner); |
b97bf3fd PL |
196 | |
197 | /* update counters used in statistical profiling of send traffic */ | |
05dcc5aa | 198 | l_ptr->stats.accu_queue_sz += skb_queue_len(&l_ptr->transmq); |
b97bf3fd PL |
199 | l_ptr->stats.queue_sz_counts++; |
200 | ||
05dcc5aa | 201 | skb = skb_peek(&l_ptr->transmq); |
58dc55f2 YX |
202 | if (skb) { |
203 | struct tipc_msg *msg = buf_msg(skb); | |
b97bf3fd PL |
204 | u32 length = msg_size(msg); |
205 | ||
f64f9e71 JP |
206 | if ((msg_user(msg) == MSG_FRAGMENTER) && |
207 | (msg_type(msg) == FIRST_FRAGMENT)) { | |
b97bf3fd PL |
208 | length = msg_size(msg_get_wrapped(msg)); |
209 | } | |
210 | if (length) { | |
211 | l_ptr->stats.msg_lengths_total += length; | |
212 | l_ptr->stats.msg_length_counts++; | |
213 | if (length <= 64) | |
214 | l_ptr->stats.msg_length_profile[0]++; | |
215 | else if (length <= 256) | |
216 | l_ptr->stats.msg_length_profile[1]++; | |
217 | else if (length <= 1024) | |
218 | l_ptr->stats.msg_length_profile[2]++; | |
219 | else if (length <= 4096) | |
220 | l_ptr->stats.msg_length_profile[3]++; | |
221 | else if (length <= 16384) | |
222 | l_ptr->stats.msg_length_profile[4]++; | |
223 | else if (length <= 32768) | |
224 | l_ptr->stats.msg_length_profile[5]++; | |
225 | else | |
226 | l_ptr->stats.msg_length_profile[6]++; | |
227 | } | |
228 | } | |
229 | ||
230 | /* do all other link processing performed on a periodic basis */ | |
b97bf3fd PL |
231 | link_state_event(l_ptr, TIMEOUT_EVT); |
232 | ||
05dcc5aa | 233 | if (skb_queue_len(&l_ptr->backlogq)) |
47b4c9a8 | 234 | tipc_link_push_packets(l_ptr); |
b97bf3fd | 235 | |
4323add6 | 236 | tipc_node_unlock(l_ptr->owner); |
2d72d495 | 237 | tipc_link_put(l_ptr); |
b97bf3fd PL |
238 | } |
239 | ||
2f55c437 | 240 | static void link_set_timer(struct tipc_link *link, unsigned long time) |
b97bf3fd | 241 | { |
2d72d495 JPM |
242 | if (!mod_timer(&link->timer, jiffies + time)) |
243 | tipc_link_get(link); | |
b97bf3fd PL |
244 | } |
245 | ||
246 | /** | |
4323add6 | 247 | * tipc_link_create - create a new link |
37b9c08a | 248 | * @n_ptr: pointer to associated node |
b97bf3fd | 249 | * @b_ptr: pointer to associated bearer |
b97bf3fd | 250 | * @media_addr: media address to use when sending messages over link |
c4307285 | 251 | * |
b97bf3fd PL |
252 | * Returns pointer to link. |
253 | */ | |
a18c4bc3 | 254 | struct tipc_link *tipc_link_create(struct tipc_node *n_ptr, |
c61dd61d YX |
255 | struct tipc_bearer *b_ptr, |
256 | const struct tipc_media_addr *media_addr) | |
b97bf3fd | 257 | { |
34747539 | 258 | struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id); |
a18c4bc3 | 259 | struct tipc_link *l_ptr; |
b97bf3fd PL |
260 | struct tipc_msg *msg; |
261 | char *if_name; | |
37b9c08a AS |
262 | char addr_string[16]; |
263 | u32 peer = n_ptr->addr; | |
264 | ||
0372bf5c | 265 | if (n_ptr->link_cnt >= MAX_BEARERS) { |
37b9c08a | 266 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
0372bf5c HB |
267 | pr_err("Attempt to establish %uth link to %s. Max %u allowed.\n", |
268 | n_ptr->link_cnt, addr_string, MAX_BEARERS); | |
37b9c08a AS |
269 | return NULL; |
270 | } | |
271 | ||
272 | if (n_ptr->links[b_ptr->identity]) { | |
273 | tipc_addr_string_fill(addr_string, n_ptr->addr); | |
2cf8aa19 EH |
274 | pr_err("Attempt to establish second link on <%s> to %s\n", |
275 | b_ptr->name, addr_string); | |
37b9c08a AS |
276 | return NULL; |
277 | } | |
b97bf3fd | 278 | |
0da974f4 | 279 | l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC); |
b97bf3fd | 280 | if (!l_ptr) { |
2cf8aa19 | 281 | pr_warn("Link creation failed, no memory\n"); |
b97bf3fd PL |
282 | return NULL; |
283 | } | |
2d72d495 | 284 | kref_init(&l_ptr->ref); |
b97bf3fd | 285 | l_ptr->addr = peer; |
2d627b92 | 286 | if_name = strchr(b_ptr->name, ':') + 1; |
062b4c99 | 287 | sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:unknown", |
34747539 YX |
288 | tipc_zone(tn->own_addr), tipc_cluster(tn->own_addr), |
289 | tipc_node(tn->own_addr), | |
b97bf3fd PL |
290 | if_name, |
291 | tipc_zone(peer), tipc_cluster(peer), tipc_node(peer)); | |
062b4c99 | 292 | /* note: peer i/f name is updated by reset/activate message */ |
b97bf3fd | 293 | memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr)); |
37b9c08a | 294 | l_ptr->owner = n_ptr; |
b97bf3fd | 295 | l_ptr->checkpoint = 1; |
f882cb76 | 296 | l_ptr->peer_session = INVALID_SESSION; |
7a2f7d18 | 297 | l_ptr->bearer_id = b_ptr->identity; |
5c216e1d | 298 | link_set_supervision_props(l_ptr, b_ptr->tolerance); |
b97bf3fd PL |
299 | l_ptr->state = RESET_UNKNOWN; |
300 | ||
301 | l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg; | |
302 | msg = l_ptr->pmsg; | |
c5898636 | 303 | tipc_msg_init(tn->own_addr, msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, |
34747539 | 304 | l_ptr->addr); |
b97bf3fd | 305 | msg_set_size(msg, sizeof(l_ptr->proto_msg)); |
bafa29e3 | 306 | msg_set_session(msg, (tn->random & 0xffff)); |
b97bf3fd PL |
307 | msg_set_bearer_id(msg, b_ptr->identity); |
308 | strcpy((char *)msg_data(msg), if_name); | |
7a2f7d18 | 309 | l_ptr->net_plane = b_ptr->net_plane; |
b97bf3fd | 310 | link_init_max_pkt(l_ptr); |
e3eea1eb JPM |
311 | l_ptr->priority = b_ptr->priority; |
312 | tipc_link_set_queue_limits(l_ptr, b_ptr->window); | |
b97bf3fd PL |
313 | |
314 | l_ptr->next_out_no = 1; | |
05dcc5aa JPM |
315 | __skb_queue_head_init(&l_ptr->transmq); |
316 | __skb_queue_head_init(&l_ptr->backlogq); | |
317 | __skb_queue_head_init(&l_ptr->deferdq); | |
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 | { |
05dcc5aa | 403 | uint pend_qsz = skb_queue_len(&link->backlogq); |
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 | { |
05dcc5aa JPM |
433 | __skb_queue_purge(&l_ptr->deferdq); |
434 | __skb_queue_purge(&l_ptr->transmq); | |
435 | __skb_queue_purge(&l_ptr->backlogq); | |
4323add6 | 436 | tipc_link_reset_fragments(l_ptr); |
b97bf3fd PL |
437 | } |
438 | ||
a18c4bc3 | 439 | void tipc_link_reset(struct tipc_link *l_ptr) |
b97bf3fd | 440 | { |
b97bf3fd PL |
441 | u32 prev_state = l_ptr->state; |
442 | u32 checkpoint = l_ptr->next_in_no; | |
5392d646 | 443 | int was_active_link = tipc_link_is_active(l_ptr); |
50100a5e | 444 | struct tipc_node *owner = l_ptr->owner; |
c4307285 | 445 | |
a686e685 | 446 | msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff)); |
b97bf3fd | 447 | |
a686e685 AS |
448 | /* Link is down, accept any session */ |
449 | l_ptr->peer_session = INVALID_SESSION; | |
b97bf3fd | 450 | |
c4307285 | 451 | /* Prepare for max packet size negotiation */ |
b97bf3fd | 452 | link_init_max_pkt(l_ptr); |
c4307285 | 453 | |
b97bf3fd | 454 | l_ptr->state = RESET_UNKNOWN; |
b97bf3fd PL |
455 | |
456 | if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET)) | |
457 | return; | |
458 | ||
4323add6 | 459 | tipc_node_link_down(l_ptr->owner, l_ptr); |
7f9f95d9 | 460 | tipc_bearer_remove_dest(owner->net, l_ptr->bearer_id, l_ptr->addr); |
7368ddf1 | 461 | |
b9d4c339 | 462 | if (was_active_link && tipc_node_active_links(l_ptr->owner)) { |
b97bf3fd PL |
463 | l_ptr->reset_checkpoint = checkpoint; |
464 | l_ptr->exp_msg_count = START_CHANGEOVER; | |
465 | } | |
466 | ||
c637c103 | 467 | /* Clean up all queues, except inputq: */ |
05dcc5aa JPM |
468 | __skb_queue_purge(&l_ptr->transmq); |
469 | __skb_queue_purge(&l_ptr->backlogq); | |
470 | __skb_queue_purge(&l_ptr->deferdq); | |
e6441bae JPM |
471 | if (!owner->inputq) |
472 | owner->inputq = &l_ptr->inputq; | |
473 | skb_queue_splice_init(&l_ptr->wakeupq, owner->inputq); | |
474 | if (!skb_queue_empty(owner->inputq)) | |
c637c103 | 475 | owner->action_flags |= TIPC_MSG_EVT; |
05dcc5aa | 476 | l_ptr->rcv_unacked = 0; |
b97bf3fd PL |
477 | l_ptr->checkpoint = 1; |
478 | l_ptr->next_out_no = 1; | |
b97bf3fd PL |
479 | l_ptr->fsm_msg_cnt = 0; |
480 | l_ptr->stale_count = 0; | |
481 | link_reset_statistics(l_ptr); | |
b97bf3fd PL |
482 | } |
483 | ||
f2f9800d | 484 | void tipc_link_reset_list(struct net *net, unsigned int bearer_id) |
e0ca2c30 | 485 | { |
f2f9800d | 486 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
e0ca2c30 | 487 | struct tipc_link *l_ptr; |
c61dd61d | 488 | struct tipc_node *n_ptr; |
e0ca2c30 | 489 | |
6c7a762e | 490 | rcu_read_lock(); |
f2f9800d | 491 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
5356f3d7 | 492 | tipc_node_lock(n_ptr); |
c61dd61d YX |
493 | l_ptr = n_ptr->links[bearer_id]; |
494 | if (l_ptr) | |
495 | tipc_link_reset(l_ptr); | |
5356f3d7 | 496 | tipc_node_unlock(n_ptr); |
e0ca2c30 | 497 | } |
6c7a762e | 498 | rcu_read_unlock(); |
e0ca2c30 | 499 | } |
b97bf3fd | 500 | |
7f9f95d9 | 501 | static void link_activate(struct tipc_link *link) |
b97bf3fd | 502 | { |
7f9f95d9 YX |
503 | struct tipc_node *node = link->owner; |
504 | ||
505 | link->next_in_no = 1; | |
506 | link->stats.recv_info = 1; | |
507 | tipc_node_link_up(node, link); | |
508 | tipc_bearer_add_dest(node->net, link->bearer_id, link->addr); | |
b97bf3fd PL |
509 | } |
510 | ||
511 | /** | |
512 | * link_state_event - link finite state machine | |
513 | * @l_ptr: pointer to link | |
514 | * @event: state machine event to process | |
515 | */ | |
95c96174 | 516 | static void link_state_event(struct tipc_link *l_ptr, unsigned int event) |
b97bf3fd | 517 | { |
a18c4bc3 | 518 | struct tipc_link *other; |
2f55c437 | 519 | unsigned long cont_intv = l_ptr->cont_intv; |
b97bf3fd | 520 | |
7d33939f JPM |
521 | if (l_ptr->flags & LINK_STOPPED) |
522 | return; | |
523 | ||
135daee6 | 524 | if (!(l_ptr->flags & LINK_STARTED) && (event != STARTING_EVT)) |
b97bf3fd PL |
525 | return; /* Not yet. */ |
526 | ||
77a7e07a YX |
527 | /* Check whether changeover is going on */ |
528 | if (l_ptr->exp_msg_count) { | |
a016892c | 529 | if (event == TIMEOUT_EVT) |
b97bf3fd | 530 | link_set_timer(l_ptr, cont_intv); |
77a7e07a | 531 | return; |
b97bf3fd | 532 | } |
b97bf3fd PL |
533 | |
534 | switch (l_ptr->state) { | |
535 | case WORKING_WORKING: | |
b97bf3fd PL |
536 | switch (event) { |
537 | case TRAFFIC_MSG_EVT: | |
b97bf3fd | 538 | case ACTIVATE_MSG: |
b97bf3fd PL |
539 | break; |
540 | case TIMEOUT_EVT: | |
b97bf3fd PL |
541 | if (l_ptr->next_in_no != l_ptr->checkpoint) { |
542 | l_ptr->checkpoint = l_ptr->next_in_no; | |
4323add6 | 543 | if (tipc_bclink_acks_missing(l_ptr->owner)) { |
247f0f3c YX |
544 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
545 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
546 | l_ptr->fsm_msg_cnt++; |
547 | } else if (l_ptr->max_pkt < l_ptr->max_pkt_target) { | |
247f0f3c YX |
548 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
549 | 1, 0, 0, 0, 0); | |
b97bf3fd PL |
550 | l_ptr->fsm_msg_cnt++; |
551 | } | |
552 | link_set_timer(l_ptr, cont_intv); | |
553 | break; | |
554 | } | |
b97bf3fd PL |
555 | l_ptr->state = WORKING_UNKNOWN; |
556 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c | 557 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0); |
b97bf3fd PL |
558 | l_ptr->fsm_msg_cnt++; |
559 | link_set_timer(l_ptr, cont_intv / 4); | |
560 | break; | |
561 | case RESET_MSG: | |
3fa9cacd EH |
562 | pr_debug("%s<%s>, requested by peer\n", |
563 | link_rst_msg, l_ptr->name); | |
4323add6 | 564 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
565 | l_ptr->state = RESET_RESET; |
566 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
567 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
568 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
569 | l_ptr->fsm_msg_cnt++; |
570 | link_set_timer(l_ptr, cont_intv); | |
571 | break; | |
572 | default: | |
3fa9cacd | 573 | pr_debug("%s%u in WW state\n", link_unk_evt, event); |
b97bf3fd PL |
574 | } |
575 | break; | |
576 | case WORKING_UNKNOWN: | |
b97bf3fd PL |
577 | switch (event) { |
578 | case TRAFFIC_MSG_EVT: | |
b97bf3fd | 579 | case ACTIVATE_MSG: |
b97bf3fd PL |
580 | l_ptr->state = WORKING_WORKING; |
581 | l_ptr->fsm_msg_cnt = 0; | |
582 | link_set_timer(l_ptr, cont_intv); | |
583 | break; | |
584 | case RESET_MSG: | |
3fa9cacd EH |
585 | pr_debug("%s<%s>, requested by peer while probing\n", |
586 | link_rst_msg, l_ptr->name); | |
4323add6 | 587 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
588 | l_ptr->state = RESET_RESET; |
589 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
590 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
591 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
592 | l_ptr->fsm_msg_cnt++; |
593 | link_set_timer(l_ptr, cont_intv); | |
594 | break; | |
595 | case TIMEOUT_EVT: | |
b97bf3fd | 596 | if (l_ptr->next_in_no != l_ptr->checkpoint) { |
b97bf3fd PL |
597 | l_ptr->state = WORKING_WORKING; |
598 | l_ptr->fsm_msg_cnt = 0; | |
599 | l_ptr->checkpoint = l_ptr->next_in_no; | |
4323add6 | 600 | if (tipc_bclink_acks_missing(l_ptr->owner)) { |
247f0f3c YX |
601 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
602 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
603 | l_ptr->fsm_msg_cnt++; |
604 | } | |
605 | link_set_timer(l_ptr, cont_intv); | |
606 | } else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) { | |
247f0f3c YX |
607 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
608 | 1, 0, 0, 0, 0); | |
b97bf3fd PL |
609 | l_ptr->fsm_msg_cnt++; |
610 | link_set_timer(l_ptr, cont_intv / 4); | |
611 | } else { /* Link has failed */ | |
3fa9cacd EH |
612 | pr_debug("%s<%s>, peer not responding\n", |
613 | link_rst_msg, l_ptr->name); | |
4323add6 | 614 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
615 | l_ptr->state = RESET_UNKNOWN; |
616 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
617 | tipc_link_proto_xmit(l_ptr, RESET_MSG, |
618 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
619 | l_ptr->fsm_msg_cnt++; |
620 | link_set_timer(l_ptr, cont_intv); | |
621 | } | |
622 | break; | |
623 | default: | |
2cf8aa19 | 624 | pr_err("%s%u in WU state\n", link_unk_evt, event); |
b97bf3fd PL |
625 | } |
626 | break; | |
627 | case RESET_UNKNOWN: | |
b97bf3fd PL |
628 | switch (event) { |
629 | case TRAFFIC_MSG_EVT: | |
b97bf3fd PL |
630 | break; |
631 | case ACTIVATE_MSG: | |
632 | other = l_ptr->owner->active_links[0]; | |
8d64a5ba | 633 | if (other && link_working_unknown(other)) |
b97bf3fd | 634 | break; |
b97bf3fd PL |
635 | l_ptr->state = WORKING_WORKING; |
636 | l_ptr->fsm_msg_cnt = 0; | |
637 | link_activate(l_ptr); | |
247f0f3c | 638 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0); |
b97bf3fd | 639 | l_ptr->fsm_msg_cnt++; |
c64f7a6a | 640 | if (l_ptr->owner->working_links == 1) |
247f0f3c | 641 | tipc_link_sync_xmit(l_ptr); |
b97bf3fd PL |
642 | link_set_timer(l_ptr, cont_intv); |
643 | break; | |
644 | case RESET_MSG: | |
b97bf3fd PL |
645 | l_ptr->state = RESET_RESET; |
646 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
647 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
648 | 1, 0, 0, 0, 0); | |
b97bf3fd PL |
649 | l_ptr->fsm_msg_cnt++; |
650 | link_set_timer(l_ptr, cont_intv); | |
651 | break; | |
652 | case STARTING_EVT: | |
135daee6 | 653 | l_ptr->flags |= LINK_STARTED; |
af9946fd JPM |
654 | l_ptr->fsm_msg_cnt++; |
655 | link_set_timer(l_ptr, cont_intv); | |
656 | break; | |
b97bf3fd | 657 | case TIMEOUT_EVT: |
247f0f3c | 658 | tipc_link_proto_xmit(l_ptr, RESET_MSG, 0, 0, 0, 0, 0); |
b97bf3fd PL |
659 | l_ptr->fsm_msg_cnt++; |
660 | link_set_timer(l_ptr, cont_intv); | |
661 | break; | |
662 | default: | |
2cf8aa19 | 663 | pr_err("%s%u in RU state\n", link_unk_evt, event); |
b97bf3fd PL |
664 | } |
665 | break; | |
666 | case RESET_RESET: | |
b97bf3fd PL |
667 | switch (event) { |
668 | case TRAFFIC_MSG_EVT: | |
b97bf3fd PL |
669 | case ACTIVATE_MSG: |
670 | other = l_ptr->owner->active_links[0]; | |
8d64a5ba | 671 | if (other && link_working_unknown(other)) |
b97bf3fd | 672 | break; |
b97bf3fd PL |
673 | l_ptr->state = WORKING_WORKING; |
674 | l_ptr->fsm_msg_cnt = 0; | |
675 | link_activate(l_ptr); | |
247f0f3c | 676 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0); |
b97bf3fd | 677 | l_ptr->fsm_msg_cnt++; |
c64f7a6a | 678 | if (l_ptr->owner->working_links == 1) |
247f0f3c | 679 | tipc_link_sync_xmit(l_ptr); |
b97bf3fd PL |
680 | link_set_timer(l_ptr, cont_intv); |
681 | break; | |
682 | case RESET_MSG: | |
b97bf3fd PL |
683 | break; |
684 | case TIMEOUT_EVT: | |
247f0f3c YX |
685 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
686 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
687 | l_ptr->fsm_msg_cnt++; |
688 | link_set_timer(l_ptr, cont_intv); | |
b97bf3fd PL |
689 | break; |
690 | default: | |
2cf8aa19 | 691 | pr_err("%s%u in RR state\n", link_unk_evt, event); |
b97bf3fd PL |
692 | } |
693 | break; | |
694 | default: | |
2cf8aa19 | 695 | pr_err("Unknown link state %u/%u\n", l_ptr->state, event); |
b97bf3fd PL |
696 | } |
697 | } | |
698 | ||
4f1688b2 JPM |
699 | /* tipc_link_cong: determine return value and how to treat the |
700 | * sent buffer during link congestion. | |
701 | * - For plain, errorless user data messages we keep the buffer and | |
702 | * return -ELINKONG. | |
703 | * - For all other messages we discard the buffer and return -EHOSTUNREACH | |
704 | * - For TIPC internal messages we also reset the link | |
705 | */ | |
a6ca1094 | 706 | static int tipc_link_cong(struct tipc_link *link, struct sk_buff_head *list) |
4f1688b2 | 707 | { |
a6ca1094 YX |
708 | struct sk_buff *skb = skb_peek(list); |
709 | struct tipc_msg *msg = buf_msg(skb); | |
e3eea1eb | 710 | int imp = msg_importance(msg); |
4f1688b2 JPM |
711 | u32 oport = msg_tot_origport(msg); |
712 | ||
50100a5e | 713 | if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) { |
4f1688b2 JPM |
714 | pr_warn("%s<%s>, send queue full", link_rst_msg, link->name); |
715 | tipc_link_reset(link); | |
50100a5e | 716 | goto drop; |
4f1688b2 | 717 | } |
50100a5e JPM |
718 | if (unlikely(msg_errcode(msg))) |
719 | goto drop; | |
720 | if (unlikely(msg_reroute_cnt(msg))) | |
721 | goto drop; | |
a6ca1094 | 722 | if (TIPC_SKB_CB(skb)->wakeup_pending) |
50100a5e | 723 | return -ELINKCONG; |
a6ca1094 | 724 | if (link_schedule_user(link, oport, skb_queue_len(list), imp)) |
50100a5e JPM |
725 | return -ELINKCONG; |
726 | drop: | |
a6ca1094 | 727 | __skb_queue_purge(list); |
4f1688b2 JPM |
728 | return -EHOSTUNREACH; |
729 | } | |
730 | ||
731 | /** | |
9fbfb8b1 | 732 | * __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked |
4f1688b2 | 733 | * @link: link to use |
a6ca1094 YX |
734 | * @list: chain of buffers containing message |
735 | * | |
4f1688b2 JPM |
736 | * Consumes the buffer chain, except when returning -ELINKCONG |
737 | * Returns 0 if success, otherwise errno: -ELINKCONG, -EMSGSIZE (plain socket | |
738 | * user data messages) or -EHOSTUNREACH (all other messages/senders) | |
739 | * Only the socket functions tipc_send_stream() and tipc_send_packet() need | |
740 | * to act on the return value, since they may need to do more send attempts. | |
741 | */ | |
7f9f95d9 YX |
742 | int __tipc_link_xmit(struct net *net, struct tipc_link *link, |
743 | struct sk_buff_head *list) | |
4f1688b2 | 744 | { |
a6ca1094 | 745 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
05dcc5aa | 746 | unsigned int maxwin = link->window; |
e3eea1eb | 747 | unsigned int imp = msg_importance(msg); |
4f1688b2 JPM |
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; | |
05dcc5aa JPM |
753 | struct sk_buff_head *transmq = &link->transmq; |
754 | struct sk_buff_head *backlogq = &link->backlogq; | |
a6ca1094 | 755 | struct sk_buff *skb, *tmp; |
4f1688b2 | 756 | |
e3eea1eb | 757 | /* Match queue limit against msg importance: */ |
05dcc5aa | 758 | if (unlikely(skb_queue_len(backlogq) >= link->queue_limit[imp])) |
a6ca1094 | 759 | return tipc_link_cong(link, list); |
4f1688b2 JPM |
760 | |
761 | /* Has valid packet limit been used ? */ | |
05dcc5aa | 762 | if (unlikely(msg_size(msg) > mtu)) { |
a6ca1094 | 763 | __skb_queue_purge(list); |
4f1688b2 JPM |
764 | return -EMSGSIZE; |
765 | } | |
766 | ||
05dcc5aa | 767 | /* Prepare each packet for sending, and add to relevant queue: */ |
a6ca1094 YX |
768 | skb_queue_walk_safe(list, skb, tmp) { |
769 | __skb_unlink(skb, list); | |
58dc55f2 | 770 | msg = buf_msg(skb); |
05dcc5aa JPM |
771 | msg_set_seqno(msg, seqno); |
772 | msg_set_ack(msg, ack); | |
4f1688b2 JPM |
773 | msg_set_bcast_ack(msg, bc_last_in); |
774 | ||
05dcc5aa JPM |
775 | if (likely(skb_queue_len(transmq) < maxwin)) { |
776 | __skb_queue_tail(transmq, skb); | |
777 | tipc_bearer_send(net, link->bearer_id, skb, addr); | |
778 | link->rcv_unacked = 0; | |
779 | seqno++; | |
780 | continue; | |
781 | } | |
782 | if (tipc_msg_bundle(skb_peek_tail(backlogq), skb, mtu)) { | |
4f1688b2 | 783 | link->stats.sent_bundled++; |
4f1688b2 | 784 | continue; |
05dcc5aa JPM |
785 | } |
786 | if (tipc_msg_make_bundle(&skb, mtu, link->addr)) { | |
4f1688b2 JPM |
787 | link->stats.sent_bundled++; |
788 | link->stats.sent_bundles++; | |
4f1688b2 | 789 | } |
05dcc5aa | 790 | __skb_queue_tail(backlogq, skb); |
4f1688b2 | 791 | seqno++; |
4f1688b2 JPM |
792 | } |
793 | link->next_out_no = seqno; | |
4f1688b2 JPM |
794 | return 0; |
795 | } | |
796 | ||
a6ca1094 YX |
797 | static void skb2list(struct sk_buff *skb, struct sk_buff_head *list) |
798 | { | |
c637c103 | 799 | skb_queue_head_init(list); |
a6ca1094 YX |
800 | __skb_queue_tail(list, skb); |
801 | } | |
802 | ||
803 | static int __tipc_link_xmit_skb(struct tipc_link *link, struct sk_buff *skb) | |
804 | { | |
805 | struct sk_buff_head head; | |
806 | ||
807 | skb2list(skb, &head); | |
7f9f95d9 | 808 | return __tipc_link_xmit(link->owner->net, link, &head); |
a6ca1094 YX |
809 | } |
810 | ||
f2f9800d YX |
811 | int tipc_link_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode, |
812 | u32 selector) | |
a6ca1094 YX |
813 | { |
814 | struct sk_buff_head head; | |
815 | ||
816 | skb2list(skb, &head); | |
f2f9800d | 817 | return tipc_link_xmit(net, &head, dnode, selector); |
a6ca1094 YX |
818 | } |
819 | ||
4f1688b2 | 820 | /** |
9fbfb8b1 | 821 | * tipc_link_xmit() is the general link level function for message sending |
f2f9800d | 822 | * @net: the applicable net namespace |
a6ca1094 | 823 | * @list: chain of buffers containing message |
4f1688b2 JPM |
824 | * @dsz: amount of user data to be sent |
825 | * @dnode: address of destination node | |
826 | * @selector: a number used for deterministic link selection | |
827 | * Consumes the buffer chain, except when returning -ELINKCONG | |
828 | * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE | |
829 | */ | |
f2f9800d YX |
830 | int tipc_link_xmit(struct net *net, struct sk_buff_head *list, u32 dnode, |
831 | u32 selector) | |
4f1688b2 JPM |
832 | { |
833 | struct tipc_link *link = NULL; | |
834 | struct tipc_node *node; | |
835 | int rc = -EHOSTUNREACH; | |
836 | ||
f2f9800d | 837 | node = tipc_node_find(net, dnode); |
4f1688b2 JPM |
838 | if (node) { |
839 | tipc_node_lock(node); | |
840 | link = node->active_links[selector & 1]; | |
841 | if (link) | |
7f9f95d9 | 842 | rc = __tipc_link_xmit(net, link, list); |
4f1688b2 JPM |
843 | tipc_node_unlock(node); |
844 | } | |
4f1688b2 JPM |
845 | if (link) |
846 | return rc; | |
847 | ||
c637c103 JPM |
848 | if (likely(in_own_node(net, dnode))) |
849 | return tipc_sk_rcv(net, list); | |
4f1688b2 | 850 | |
c637c103 | 851 | __skb_queue_purge(list); |
4f1688b2 JPM |
852 | return rc; |
853 | } | |
854 | ||
c64f7a6a | 855 | /* |
247f0f3c | 856 | * tipc_link_sync_xmit - synchronize broadcast link endpoints. |
c64f7a6a JM |
857 | * |
858 | * Give a newly added peer node the sequence number where it should | |
859 | * start receiving and acking broadcast packets. | |
860 | * | |
861 | * Called with node locked | |
862 | */ | |
25b660c7 | 863 | static void tipc_link_sync_xmit(struct tipc_link *link) |
c64f7a6a | 864 | { |
a6ca1094 | 865 | struct sk_buff *skb; |
c64f7a6a JM |
866 | struct tipc_msg *msg; |
867 | ||
a6ca1094 YX |
868 | skb = tipc_buf_acquire(INT_H_SIZE); |
869 | if (!skb) | |
c64f7a6a JM |
870 | return; |
871 | ||
a6ca1094 | 872 | msg = buf_msg(skb); |
c5898636 | 873 | tipc_msg_init(link_own_addr(link), msg, BCAST_PROTOCOL, STATE_MSG, |
34747539 | 874 | INT_H_SIZE, link->addr); |
25b660c7 | 875 | msg_set_last_bcast(msg, link->owner->bclink.acked); |
a6ca1094 | 876 | __tipc_link_xmit_skb(link, skb); |
c64f7a6a JM |
877 | } |
878 | ||
879 | /* | |
247f0f3c | 880 | * tipc_link_sync_rcv - synchronize broadcast link endpoints. |
c64f7a6a JM |
881 | * Receive the sequence number where we should start receiving and |
882 | * acking broadcast packets from a newly added peer node, and open | |
883 | * up for reception of such packets. | |
884 | * | |
885 | * Called with node locked | |
886 | */ | |
247f0f3c | 887 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf) |
c64f7a6a JM |
888 | { |
889 | struct tipc_msg *msg = buf_msg(buf); | |
890 | ||
891 | n->bclink.last_sent = n->bclink.last_in = msg_last_bcast(msg); | |
892 | n->bclink.recv_permitted = true; | |
893 | kfree_skb(buf); | |
894 | } | |
895 | ||
c4307285 | 896 | /* |
47b4c9a8 YX |
897 | * tipc_link_push_packets - push unsent packets to bearer |
898 | * | |
899 | * Push out the unsent messages of a link where congestion | |
900 | * has abated. Node is locked. | |
901 | * | |
902 | * Called with node locked | |
b97bf3fd | 903 | */ |
05dcc5aa | 904 | void tipc_link_push_packets(struct tipc_link *link) |
b97bf3fd | 905 | { |
05dcc5aa | 906 | struct sk_buff *skb; |
47b4c9a8 | 907 | struct tipc_msg *msg; |
05dcc5aa | 908 | unsigned int ack = mod(link->next_in_no - 1); |
b97bf3fd | 909 | |
05dcc5aa JPM |
910 | while (skb_queue_len(&link->transmq) < link->window) { |
911 | skb = __skb_dequeue(&link->backlogq); | |
912 | if (!skb) | |
47b4c9a8 | 913 | break; |
05dcc5aa JPM |
914 | msg = buf_msg(skb); |
915 | msg_set_ack(msg, ack); | |
916 | msg_set_bcast_ack(msg, link->owner->bclink.last_in); | |
917 | link->rcv_unacked = 0; | |
918 | __skb_queue_tail(&link->transmq, skb); | |
919 | tipc_bearer_send(link->owner->net, link->bearer_id, | |
920 | skb, &link->media_addr); | |
b97bf3fd | 921 | } |
b97bf3fd PL |
922 | } |
923 | ||
3f5a12bd | 924 | void tipc_link_reset_all(struct tipc_node *node) |
d356eeba | 925 | { |
d356eeba AS |
926 | char addr_string[16]; |
927 | u32 i; | |
928 | ||
3f5a12bd | 929 | tipc_node_lock(node); |
d356eeba | 930 | |
2cf8aa19 | 931 | pr_warn("Resetting all links to %s\n", |
3f5a12bd | 932 | tipc_addr_string_fill(addr_string, node->addr)); |
d356eeba AS |
933 | |
934 | for (i = 0; i < MAX_BEARERS; i++) { | |
3f5a12bd YX |
935 | if (node->links[i]) { |
936 | link_print(node->links[i], "Resetting link\n"); | |
937 | tipc_link_reset(node->links[i]); | |
d356eeba AS |
938 | } |
939 | } | |
940 | ||
3f5a12bd | 941 | tipc_node_unlock(node); |
d356eeba AS |
942 | } |
943 | ||
a18c4bc3 | 944 | static void link_retransmit_failure(struct tipc_link *l_ptr, |
ae8509c4 | 945 | struct sk_buff *buf) |
d356eeba AS |
946 | { |
947 | struct tipc_msg *msg = buf_msg(buf); | |
1da46568 | 948 | struct net *net = l_ptr->owner->net; |
d356eeba | 949 | |
2cf8aa19 | 950 | pr_warn("Retransmission failure on link <%s>\n", l_ptr->name); |
d356eeba AS |
951 | |
952 | if (l_ptr->addr) { | |
d356eeba | 953 | /* Handle failure on standard link */ |
8d64a5ba | 954 | link_print(l_ptr, "Resetting link\n"); |
d356eeba AS |
955 | tipc_link_reset(l_ptr); |
956 | ||
957 | } else { | |
d356eeba | 958 | /* Handle failure on broadcast link */ |
6c00055a | 959 | struct tipc_node *n_ptr; |
d356eeba AS |
960 | char addr_string[16]; |
961 | ||
2cf8aa19 EH |
962 | pr_info("Msg seq number: %u, ", msg_seqno(msg)); |
963 | pr_cont("Outstanding acks: %lu\n", | |
964 | (unsigned long) TIPC_SKB_CB(buf)->handle); | |
617dbeaa | 965 | |
1da46568 | 966 | n_ptr = tipc_bclink_retransmit_to(net); |
d356eeba AS |
967 | tipc_node_lock(n_ptr); |
968 | ||
c68ca7b7 | 969 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
2cf8aa19 | 970 | pr_info("Broadcast link info for %s\n", addr_string); |
389dd9bc YX |
971 | pr_info("Reception permitted: %d, Acked: %u\n", |
972 | n_ptr->bclink.recv_permitted, | |
2cf8aa19 EH |
973 | n_ptr->bclink.acked); |
974 | pr_info("Last in: %u, Oos state: %u, Last sent: %u\n", | |
975 | n_ptr->bclink.last_in, | |
976 | n_ptr->bclink.oos_state, | |
977 | n_ptr->bclink.last_sent); | |
d356eeba | 978 | |
d356eeba AS |
979 | tipc_node_unlock(n_ptr); |
980 | ||
1da46568 | 981 | tipc_bclink_set_flags(net, TIPC_BCLINK_RESET); |
d356eeba AS |
982 | l_ptr->stale_count = 0; |
983 | } | |
984 | } | |
985 | ||
58dc55f2 | 986 | void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb, |
4323add6 | 987 | u32 retransmits) |
b97bf3fd PL |
988 | { |
989 | struct tipc_msg *msg; | |
990 | ||
58dc55f2 | 991 | if (!skb) |
d356eeba AS |
992 | return; |
993 | ||
58dc55f2 | 994 | msg = buf_msg(skb); |
c4307285 | 995 | |
512137ee EH |
996 | /* Detect repeated retransmit failures */ |
997 | if (l_ptr->last_retransmitted == msg_seqno(msg)) { | |
998 | if (++l_ptr->stale_count > 100) { | |
58dc55f2 | 999 | link_retransmit_failure(l_ptr, skb); |
512137ee | 1000 | return; |
d356eeba AS |
1001 | } |
1002 | } else { | |
512137ee EH |
1003 | l_ptr->last_retransmitted = msg_seqno(msg); |
1004 | l_ptr->stale_count = 1; | |
b97bf3fd | 1005 | } |
d356eeba | 1006 | |
05dcc5aa JPM |
1007 | skb_queue_walk_from(&l_ptr->transmq, skb) { |
1008 | if (!retransmits) | |
58dc55f2 YX |
1009 | break; |
1010 | msg = buf_msg(skb); | |
b97bf3fd | 1011 | msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); |
c4307285 | 1012 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
7f9f95d9 YX |
1013 | tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, skb, |
1014 | &l_ptr->media_addr); | |
3c294cb3 YX |
1015 | retransmits--; |
1016 | l_ptr->stats.retransmitted++; | |
b97bf3fd | 1017 | } |
b97bf3fd PL |
1018 | } |
1019 | ||
f03273f1 YX |
1020 | static void link_retrieve_defq(struct tipc_link *link, |
1021 | struct sk_buff_head *list) | |
b97bf3fd PL |
1022 | { |
1023 | u32 seq_no; | |
1024 | ||
05dcc5aa | 1025 | if (skb_queue_empty(&link->deferdq)) |
f03273f1 YX |
1026 | return; |
1027 | ||
05dcc5aa | 1028 | seq_no = buf_seqno(skb_peek(&link->deferdq)); |
f03273f1 | 1029 | if (seq_no == mod(link->next_in_no)) |
05dcc5aa | 1030 | skb_queue_splice_tail_init(&link->deferdq, list); |
b97bf3fd PL |
1031 | } |
1032 | ||
b02b69c8 | 1033 | /** |
170b3927 | 1034 | * tipc_rcv - process TIPC packets/messages arriving from off-node |
f2f9800d | 1035 | * @net: the applicable net namespace |
f03273f1 | 1036 | * @skb: TIPC packet |
7a2f7d18 | 1037 | * @b_ptr: pointer to bearer message arrived on |
b02b69c8 AS |
1038 | * |
1039 | * Invoked with no locks held. Bearer pointer must point to a valid bearer | |
1040 | * structure (i.e. cannot be NULL), but bearer can be inactive. | |
1041 | */ | |
c93d3baa | 1042 | void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr) |
b97bf3fd | 1043 | { |
34747539 | 1044 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
f03273f1 YX |
1045 | struct sk_buff_head head; |
1046 | struct tipc_node *n_ptr; | |
1047 | struct tipc_link *l_ptr; | |
1048 | struct sk_buff *skb1, *tmp; | |
1049 | struct tipc_msg *msg; | |
1050 | u32 seq_no; | |
1051 | u32 ackd; | |
1052 | u32 released; | |
b97bf3fd | 1053 | |
a6ca1094 | 1054 | skb2list(skb, &head); |
85035568 | 1055 | |
f03273f1 | 1056 | while ((skb = __skb_dequeue(&head))) { |
85035568 | 1057 | /* Ensure message is well-formed */ |
cf2157f8 | 1058 | if (unlikely(!tipc_msg_validate(skb))) |
3af390e2 | 1059 | goto discard; |
b97bf3fd | 1060 | |
85035568 | 1061 | /* Handle arrival of a non-unicast link message */ |
f03273f1 | 1062 | msg = buf_msg(skb); |
b97bf3fd | 1063 | if (unlikely(msg_non_seq(msg))) { |
1265a021 | 1064 | if (msg_user(msg) == LINK_CONFIG) |
c93d3baa | 1065 | tipc_disc_rcv(net, skb, b_ptr); |
1265a021 | 1066 | else |
c93d3baa | 1067 | tipc_bclink_rcv(net, skb); |
b97bf3fd PL |
1068 | continue; |
1069 | } | |
c4307285 | 1070 | |
ed33a9c4 | 1071 | /* Discard unicast link messages destined for another node */ |
26008247 | 1072 | if (unlikely(!msg_short(msg) && |
34747539 | 1073 | (msg_destnode(msg) != tn->own_addr))) |
3af390e2 | 1074 | goto discard; |
c4307285 | 1075 | |
5a68d5ee | 1076 | /* Locate neighboring node that sent message */ |
f2f9800d | 1077 | n_ptr = tipc_node_find(net, msg_prevnode(msg)); |
b97bf3fd | 1078 | if (unlikely(!n_ptr)) |
3af390e2 | 1079 | goto discard; |
4323add6 | 1080 | tipc_node_lock(n_ptr); |
85035568 | 1081 | |
b4b56102 | 1082 | /* Locate unicast link endpoint that should handle message */ |
b4b56102 | 1083 | l_ptr = n_ptr->links[b_ptr->identity]; |
3af390e2 | 1084 | if (unlikely(!l_ptr)) |
c637c103 | 1085 | goto unlock; |
5a68d5ee | 1086 | |
b4b56102 | 1087 | /* Verify that communication with node is currently allowed */ |
aecb9bb8 | 1088 | if ((n_ptr->action_flags & TIPC_WAIT_PEER_LINKS_DOWN) && |
10f465c4 YX |
1089 | msg_user(msg) == LINK_PROTOCOL && |
1090 | (msg_type(msg) == RESET_MSG || | |
1091 | msg_type(msg) == ACTIVATE_MSG) && | |
1092 | !msg_redundant_link(msg)) | |
aecb9bb8 | 1093 | n_ptr->action_flags &= ~TIPC_WAIT_PEER_LINKS_DOWN; |
10f465c4 YX |
1094 | |
1095 | if (tipc_node_blocked(n_ptr)) | |
c637c103 | 1096 | goto unlock; |
85035568 AS |
1097 | |
1098 | /* Validate message sequence number info */ | |
85035568 AS |
1099 | seq_no = msg_seqno(msg); |
1100 | ackd = msg_ack(msg); | |
1101 | ||
1102 | /* Release acked messages */ | |
2cdf3918 | 1103 | if (unlikely(n_ptr->bclink.acked != msg_bcast_ack(msg))) |
36559591 | 1104 | tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg)); |
b97bf3fd | 1105 | |
58dc55f2 | 1106 | released = 0; |
05dcc5aa JPM |
1107 | skb_queue_walk_safe(&l_ptr->transmq, skb1, tmp) { |
1108 | if (more(buf_seqno(skb1), ackd)) | |
58dc55f2 | 1109 | break; |
05dcc5aa | 1110 | __skb_unlink(skb1, &l_ptr->transmq); |
58dc55f2 YX |
1111 | kfree_skb(skb1); |
1112 | released = 1; | |
b97bf3fd | 1113 | } |
85035568 AS |
1114 | |
1115 | /* Try sending any messages link endpoint has pending */ | |
05dcc5aa | 1116 | if (unlikely(skb_queue_len(&l_ptr->backlogq))) |
47b4c9a8 | 1117 | tipc_link_push_packets(l_ptr); |
a5377831 | 1118 | |
c637c103 | 1119 | if (released && !skb_queue_empty(&l_ptr->wakeupq)) |
50100a5e | 1120 | link_prepare_wakeup(l_ptr); |
a5377831 | 1121 | |
a5377831 | 1122 | /* Process the incoming packet */ |
3af390e2 YX |
1123 | if (unlikely(!link_working_working(l_ptr))) { |
1124 | if (msg_user(msg) == LINK_PROTOCOL) { | |
c5898636 | 1125 | tipc_link_proto_rcv(l_ptr, skb); |
f03273f1 | 1126 | link_retrieve_defq(l_ptr, &head); |
c637c103 JPM |
1127 | skb = NULL; |
1128 | goto unlock; | |
b97bf3fd | 1129 | } |
3af390e2 YX |
1130 | |
1131 | /* Traffic message. Conditionally activate link */ | |
1132 | link_state_event(l_ptr, TRAFFIC_MSG_EVT); | |
1133 | ||
1134 | if (link_working_working(l_ptr)) { | |
1135 | /* Re-insert buffer in front of queue */ | |
f03273f1 | 1136 | __skb_queue_head(&head, skb); |
c637c103 JPM |
1137 | skb = NULL; |
1138 | goto unlock; | |
3af390e2 | 1139 | } |
c637c103 | 1140 | goto unlock; |
3af390e2 YX |
1141 | } |
1142 | ||
1143 | /* Link is now in state WORKING_WORKING */ | |
1144 | if (unlikely(seq_no != mod(l_ptr->next_in_no))) { | |
c5898636 | 1145 | link_handle_out_of_seq_msg(l_ptr, skb); |
f03273f1 | 1146 | link_retrieve_defq(l_ptr, &head); |
c637c103 JPM |
1147 | skb = NULL; |
1148 | goto unlock; | |
b97bf3fd | 1149 | } |
3af390e2 | 1150 | l_ptr->next_in_no++; |
05dcc5aa | 1151 | if (unlikely(!skb_queue_empty(&l_ptr->deferdq))) |
f03273f1 | 1152 | link_retrieve_defq(l_ptr, &head); |
05dcc5aa | 1153 | if (unlikely(++l_ptr->rcv_unacked >= TIPC_MIN_LINK_WIN)) { |
3f53bd8f EH |
1154 | l_ptr->stats.sent_acks++; |
1155 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0); | |
1156 | } | |
c637c103 JPM |
1157 | tipc_link_input(l_ptr, skb); |
1158 | skb = NULL; | |
1159 | unlock: | |
3af390e2 YX |
1160 | tipc_node_unlock(n_ptr); |
1161 | discard: | |
c637c103 JPM |
1162 | if (unlikely(skb)) |
1163 | kfree_skb(skb); | |
b97bf3fd | 1164 | } |
b97bf3fd PL |
1165 | } |
1166 | ||
c637c103 | 1167 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 1168 | * |
c637c103 | 1169 | * Consumes buffer if message is of right type |
7ae934be EH |
1170 | * Node lock must be held |
1171 | */ | |
c637c103 | 1172 | static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb) |
7ae934be | 1173 | { |
c637c103 JPM |
1174 | struct tipc_node *node = link->owner; |
1175 | struct tipc_msg *msg = buf_msg(skb); | |
1176 | u32 dport = msg_destport(msg); | |
7ae934be | 1177 | |
7ae934be | 1178 | switch (msg_user(msg)) { |
c637c103 JPM |
1179 | case TIPC_LOW_IMPORTANCE: |
1180 | case TIPC_MEDIUM_IMPORTANCE: | |
1181 | case TIPC_HIGH_IMPORTANCE: | |
1182 | case TIPC_CRITICAL_IMPORTANCE: | |
1183 | case CONN_MANAGER: | |
1184 | if (tipc_skb_queue_tail(&link->inputq, skb, dport)) { | |
1185 | node->inputq = &link->inputq; | |
1186 | node->action_flags |= TIPC_MSG_EVT; | |
7ae934be | 1187 | } |
c637c103 | 1188 | return true; |
7ae934be | 1189 | case NAME_DISTRIBUTOR: |
c637c103 JPM |
1190 | node->bclink.recv_permitted = true; |
1191 | node->namedq = &link->namedq; | |
1192 | skb_queue_tail(&link->namedq, skb); | |
1193 | if (skb_queue_len(&link->namedq) == 1) | |
1194 | node->action_flags |= TIPC_NAMED_MSG_EVT; | |
1195 | return true; | |
1196 | case MSG_BUNDLER: | |
1197 | case CHANGEOVER_PROTOCOL: | |
1198 | case MSG_FRAGMENTER: | |
7ae934be | 1199 | case BCAST_PROTOCOL: |
c637c103 | 1200 | return false; |
7ae934be | 1201 | default: |
c637c103 JPM |
1202 | pr_warn("Dropping received illegal msg type\n"); |
1203 | kfree_skb(skb); | |
1204 | return false; | |
1205 | }; | |
7ae934be | 1206 | } |
c637c103 JPM |
1207 | |
1208 | /* tipc_link_input - process packet that has passed link protocol check | |
1209 | * | |
1210 | * Consumes buffer | |
1211 | * Node lock must be held | |
7ae934be | 1212 | */ |
c637c103 | 1213 | static void tipc_link_input(struct tipc_link *link, struct sk_buff *skb) |
7ae934be | 1214 | { |
c637c103 JPM |
1215 | struct tipc_node *node = link->owner; |
1216 | struct tipc_msg *msg = buf_msg(skb); | |
1217 | struct sk_buff *iskb; | |
1218 | int pos = 0; | |
1219 | ||
1220 | if (likely(tipc_data_input(link, skb))) | |
1221 | return; | |
7ae934be EH |
1222 | |
1223 | switch (msg_user(msg)) { | |
c637c103 JPM |
1224 | case CHANGEOVER_PROTOCOL: |
1225 | if (!tipc_link_tunnel_rcv(node, &skb)) | |
1226 | break; | |
1227 | if (msg_user(buf_msg(skb)) != MSG_BUNDLER) { | |
1228 | tipc_data_input(link, skb); | |
1229 | break; | |
1230 | } | |
1231 | case MSG_BUNDLER: | |
1232 | link->stats.recv_bundles++; | |
1233 | link->stats.recv_bundled += msg_msgcnt(msg); | |
1234 | ||
1235 | while (tipc_msg_extract(skb, &iskb, &pos)) | |
1236 | tipc_data_input(link, iskb); | |
7ae934be | 1237 | break; |
c637c103 JPM |
1238 | case MSG_FRAGMENTER: |
1239 | link->stats.recv_fragments++; | |
1240 | if (tipc_buf_append(&link->reasm_buf, &skb)) { | |
1241 | link->stats.recv_fragmented++; | |
1242 | tipc_data_input(link, skb); | |
1243 | } else if (!link->reasm_buf) { | |
1244 | tipc_link_reset(link); | |
1245 | } | |
7ae934be | 1246 | break; |
c637c103 JPM |
1247 | case BCAST_PROTOCOL: |
1248 | tipc_link_sync_rcv(node, skb); | |
7ae934be EH |
1249 | break; |
1250 | default: | |
c637c103 JPM |
1251 | break; |
1252 | }; | |
7ae934be EH |
1253 | } |
1254 | ||
2c53040f | 1255 | /** |
8809b255 AS |
1256 | * tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue |
1257 | * | |
1258 | * Returns increase in queue length (i.e. 0 or 1) | |
b97bf3fd | 1259 | */ |
bc6fecd4 | 1260 | u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb) |
b97bf3fd | 1261 | { |
bc6fecd4 YX |
1262 | struct sk_buff *skb1; |
1263 | u32 seq_no = buf_seqno(skb); | |
b97bf3fd PL |
1264 | |
1265 | /* Empty queue ? */ | |
bc6fecd4 YX |
1266 | if (skb_queue_empty(list)) { |
1267 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1268 | return 1; |
1269 | } | |
1270 | ||
1271 | /* Last ? */ | |
bc6fecd4 YX |
1272 | if (less(buf_seqno(skb_peek_tail(list)), seq_no)) { |
1273 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1274 | return 1; |
1275 | } | |
1276 | ||
8809b255 | 1277 | /* Locate insertion point in queue, then insert; discard if duplicate */ |
bc6fecd4 YX |
1278 | skb_queue_walk(list, skb1) { |
1279 | u32 curr_seqno = buf_seqno(skb1); | |
b97bf3fd | 1280 | |
8809b255 | 1281 | if (seq_no == curr_seqno) { |
bc6fecd4 | 1282 | kfree_skb(skb); |
8809b255 | 1283 | return 0; |
b97bf3fd | 1284 | } |
8809b255 AS |
1285 | |
1286 | if (less(seq_no, curr_seqno)) | |
b97bf3fd | 1287 | break; |
8809b255 | 1288 | } |
b97bf3fd | 1289 | |
bc6fecd4 | 1290 | __skb_queue_before(list, skb1, skb); |
8809b255 | 1291 | return 1; |
b97bf3fd PL |
1292 | } |
1293 | ||
8809b255 | 1294 | /* |
b97bf3fd PL |
1295 | * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet |
1296 | */ | |
c5898636 | 1297 | static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr, |
b97bf3fd PL |
1298 | struct sk_buff *buf) |
1299 | { | |
f905730c | 1300 | u32 seq_no = buf_seqno(buf); |
b97bf3fd PL |
1301 | |
1302 | if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) { | |
c5898636 | 1303 | tipc_link_proto_rcv(l_ptr, buf); |
b97bf3fd PL |
1304 | return; |
1305 | } | |
1306 | ||
b97bf3fd | 1307 | /* Record OOS packet arrival (force mismatch on next timeout) */ |
b97bf3fd PL |
1308 | l_ptr->checkpoint--; |
1309 | ||
c4307285 | 1310 | /* |
b97bf3fd PL |
1311 | * Discard packet if a duplicate; otherwise add it to deferred queue |
1312 | * and notify peer of gap as per protocol specification | |
1313 | */ | |
b97bf3fd PL |
1314 | if (less(seq_no, mod(l_ptr->next_in_no))) { |
1315 | l_ptr->stats.duplicates++; | |
5f6d9123 | 1316 | kfree_skb(buf); |
b97bf3fd PL |
1317 | return; |
1318 | } | |
1319 | ||
05dcc5aa | 1320 | if (tipc_link_defer_pkt(&l_ptr->deferdq, buf)) { |
b97bf3fd | 1321 | l_ptr->stats.deferred_recv++; |
05dcc5aa | 1322 | if ((skb_queue_len(&l_ptr->deferdq) % TIPC_MIN_LINK_WIN) == 1) |
247f0f3c | 1323 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0); |
bc6fecd4 | 1324 | } else { |
b97bf3fd | 1325 | l_ptr->stats.duplicates++; |
bc6fecd4 | 1326 | } |
b97bf3fd PL |
1327 | } |
1328 | ||
1329 | /* | |
1330 | * Send protocol message to the other endpoint. | |
1331 | */ | |
247f0f3c YX |
1332 | void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg, |
1333 | u32 gap, u32 tolerance, u32 priority, u32 ack_mtu) | |
b97bf3fd | 1334 | { |
1fc54d8f | 1335 | struct sk_buff *buf = NULL; |
b97bf3fd | 1336 | struct tipc_msg *msg = l_ptr->pmsg; |
c4307285 | 1337 | u32 msg_size = sizeof(l_ptr->proto_msg); |
75f0aa49 | 1338 | int r_flag; |
b97bf3fd | 1339 | |
77a7e07a YX |
1340 | /* Don't send protocol message during link changeover */ |
1341 | if (l_ptr->exp_msg_count) | |
b97bf3fd | 1342 | return; |
b4b56102 AS |
1343 | |
1344 | /* Abort non-RESET send if communication with node is prohibited */ | |
10f465c4 | 1345 | if ((tipc_node_blocked(l_ptr->owner)) && (msg_typ != RESET_MSG)) |
b4b56102 AS |
1346 | return; |
1347 | ||
92d2c905 | 1348 | /* Create protocol message with "out-of-sequence" sequence number */ |
b97bf3fd | 1349 | msg_set_type(msg, msg_typ); |
7a2f7d18 | 1350 | msg_set_net_plane(msg, l_ptr->net_plane); |
7a54d4a9 | 1351 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
1da46568 | 1352 | msg_set_last_bcast(msg, tipc_bclink_get_last_sent(l_ptr->owner->net)); |
b97bf3fd PL |
1353 | |
1354 | if (msg_typ == STATE_MSG) { | |
1355 | u32 next_sent = mod(l_ptr->next_out_no); | |
1356 | ||
4323add6 | 1357 | if (!tipc_link_is_up(l_ptr)) |
b97bf3fd | 1358 | return; |
05dcc5aa JPM |
1359 | if (skb_queue_len(&l_ptr->backlogq)) |
1360 | next_sent = buf_seqno(skb_peek(&l_ptr->backlogq)); | |
b97bf3fd | 1361 | msg_set_next_sent(msg, next_sent); |
05dcc5aa JPM |
1362 | if (!skb_queue_empty(&l_ptr->deferdq)) { |
1363 | u32 rec = buf_seqno(skb_peek(&l_ptr->deferdq)); | |
b97bf3fd PL |
1364 | gap = mod(rec - mod(l_ptr->next_in_no)); |
1365 | } | |
1366 | msg_set_seq_gap(msg, gap); | |
1367 | if (gap) | |
1368 | l_ptr->stats.sent_nacks++; | |
1369 | msg_set_link_tolerance(msg, tolerance); | |
1370 | msg_set_linkprio(msg, priority); | |
1371 | msg_set_max_pkt(msg, ack_mtu); | |
1372 | msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); | |
1373 | msg_set_probe(msg, probe_msg != 0); | |
c4307285 | 1374 | if (probe_msg) { |
b97bf3fd PL |
1375 | u32 mtu = l_ptr->max_pkt; |
1376 | ||
c4307285 | 1377 | if ((mtu < l_ptr->max_pkt_target) && |
b97bf3fd PL |
1378 | link_working_working(l_ptr) && |
1379 | l_ptr->fsm_msg_cnt) { | |
1380 | msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3; | |
c4307285 YH |
1381 | if (l_ptr->max_pkt_probes == 10) { |
1382 | l_ptr->max_pkt_target = (msg_size - 4); | |
1383 | l_ptr->max_pkt_probes = 0; | |
b97bf3fd | 1384 | msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3; |
c4307285 | 1385 | } |
b97bf3fd | 1386 | l_ptr->max_pkt_probes++; |
c4307285 | 1387 | } |
b97bf3fd PL |
1388 | |
1389 | l_ptr->stats.sent_probes++; | |
c4307285 | 1390 | } |
b97bf3fd PL |
1391 | l_ptr->stats.sent_states++; |
1392 | } else { /* RESET_MSG or ACTIVATE_MSG */ | |
1393 | msg_set_ack(msg, mod(l_ptr->reset_checkpoint - 1)); | |
1394 | msg_set_seq_gap(msg, 0); | |
1395 | msg_set_next_sent(msg, 1); | |
f23d9bf2 | 1396 | msg_set_probe(msg, 0); |
b97bf3fd PL |
1397 | msg_set_link_tolerance(msg, l_ptr->tolerance); |
1398 | msg_set_linkprio(msg, l_ptr->priority); | |
1399 | msg_set_max_pkt(msg, l_ptr->max_pkt_target); | |
1400 | } | |
1401 | ||
75f0aa49 AS |
1402 | r_flag = (l_ptr->owner->working_links > tipc_link_is_up(l_ptr)); |
1403 | msg_set_redundant_link(msg, r_flag); | |
b97bf3fd | 1404 | msg_set_linkprio(msg, l_ptr->priority); |
92d2c905 | 1405 | msg_set_size(msg, msg_size); |
b97bf3fd PL |
1406 | |
1407 | msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2))); | |
1408 | ||
31e3c3f6 | 1409 | buf = tipc_buf_acquire(msg_size); |
b97bf3fd PL |
1410 | if (!buf) |
1411 | return; | |
1412 | ||
27d7ff46 | 1413 | skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg)); |
796c75d0 | 1414 | buf->priority = TC_PRIO_CONTROL; |
7f9f95d9 YX |
1415 | tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, buf, |
1416 | &l_ptr->media_addr); | |
05dcc5aa | 1417 | l_ptr->rcv_unacked = 0; |
5f6d9123 | 1418 | kfree_skb(buf); |
b97bf3fd PL |
1419 | } |
1420 | ||
1421 | /* | |
1422 | * Receive protocol message : | |
c4307285 YH |
1423 | * Note that network plane id propagates through the network, and may |
1424 | * change at any time. The node with lowest address rules | |
b97bf3fd | 1425 | */ |
c5898636 | 1426 | static void tipc_link_proto_rcv(struct tipc_link *l_ptr, |
c93d3baa | 1427 | struct sk_buff *buf) |
b97bf3fd PL |
1428 | { |
1429 | u32 rec_gap = 0; | |
1430 | u32 max_pkt_info; | |
c4307285 | 1431 | u32 max_pkt_ack; |
b97bf3fd PL |
1432 | u32 msg_tol; |
1433 | struct tipc_msg *msg = buf_msg(buf); | |
1434 | ||
77a7e07a YX |
1435 | /* Discard protocol message during link changeover */ |
1436 | if (l_ptr->exp_msg_count) | |
b97bf3fd PL |
1437 | goto exit; |
1438 | ||
7a2f7d18 | 1439 | if (l_ptr->net_plane != msg_net_plane(msg)) |
c5898636 | 1440 | if (link_own_addr(l_ptr) > msg_prevnode(msg)) |
7a2f7d18 | 1441 | l_ptr->net_plane = msg_net_plane(msg); |
b97bf3fd | 1442 | |
b97bf3fd | 1443 | switch (msg_type(msg)) { |
c4307285 | 1444 | |
b97bf3fd | 1445 | case RESET_MSG: |
a686e685 AS |
1446 | if (!link_working_unknown(l_ptr) && |
1447 | (l_ptr->peer_session != INVALID_SESSION)) { | |
641c218d AS |
1448 | if (less_eq(msg_session(msg), l_ptr->peer_session)) |
1449 | break; /* duplicate or old reset: ignore */ | |
b97bf3fd | 1450 | } |
b4b56102 AS |
1451 | |
1452 | if (!msg_redundant_link(msg) && (link_working_working(l_ptr) || | |
1453 | link_working_unknown(l_ptr))) { | |
1454 | /* | |
1455 | * peer has lost contact -- don't allow peer's links | |
1456 | * to reactivate before we recognize loss & clean up | |
1457 | */ | |
ca9cf06a | 1458 | l_ptr->owner->action_flags |= TIPC_WAIT_OWN_LINKS_DOWN; |
b4b56102 AS |
1459 | } |
1460 | ||
47361c87 AS |
1461 | link_state_event(l_ptr, RESET_MSG); |
1462 | ||
b97bf3fd PL |
1463 | /* fall thru' */ |
1464 | case ACTIVATE_MSG: | |
1465 | /* Update link settings according other endpoint's values */ | |
b97bf3fd PL |
1466 | strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg)); |
1467 | ||
2db9983a AS |
1468 | msg_tol = msg_link_tolerance(msg); |
1469 | if (msg_tol > l_ptr->tolerance) | |
b97bf3fd PL |
1470 | link_set_supervision_props(l_ptr, msg_tol); |
1471 | ||
1472 | if (msg_linkprio(msg) > l_ptr->priority) | |
1473 | l_ptr->priority = msg_linkprio(msg); | |
1474 | ||
1475 | max_pkt_info = msg_max_pkt(msg); | |
c4307285 | 1476 | if (max_pkt_info) { |
b97bf3fd PL |
1477 | if (max_pkt_info < l_ptr->max_pkt_target) |
1478 | l_ptr->max_pkt_target = max_pkt_info; | |
1479 | if (l_ptr->max_pkt > l_ptr->max_pkt_target) | |
1480 | l_ptr->max_pkt = l_ptr->max_pkt_target; | |
1481 | } else { | |
c4307285 | 1482 | l_ptr->max_pkt = l_ptr->max_pkt_target; |
b97bf3fd | 1483 | } |
b97bf3fd | 1484 | |
4d75313c | 1485 | /* Synchronize broadcast link info, if not done previously */ |
7a54d4a9 AS |
1486 | if (!tipc_node_is_up(l_ptr->owner)) { |
1487 | l_ptr->owner->bclink.last_sent = | |
1488 | l_ptr->owner->bclink.last_in = | |
1489 | msg_last_bcast(msg); | |
1490 | l_ptr->owner->bclink.oos_state = 0; | |
1491 | } | |
4d75313c | 1492 | |
b97bf3fd PL |
1493 | l_ptr->peer_session = msg_session(msg); |
1494 | l_ptr->peer_bearer_id = msg_bearer_id(msg); | |
47361c87 AS |
1495 | |
1496 | if (msg_type(msg) == ACTIVATE_MSG) | |
1497 | link_state_event(l_ptr, ACTIVATE_MSG); | |
b97bf3fd PL |
1498 | break; |
1499 | case STATE_MSG: | |
1500 | ||
2db9983a AS |
1501 | msg_tol = msg_link_tolerance(msg); |
1502 | if (msg_tol) | |
b97bf3fd | 1503 | link_set_supervision_props(l_ptr, msg_tol); |
c4307285 YH |
1504 | |
1505 | if (msg_linkprio(msg) && | |
b97bf3fd | 1506 | (msg_linkprio(msg) != l_ptr->priority)) { |
3fa9cacd EH |
1507 | pr_debug("%s<%s>, priority change %u->%u\n", |
1508 | link_rst_msg, l_ptr->name, | |
1509 | l_ptr->priority, msg_linkprio(msg)); | |
b97bf3fd | 1510 | l_ptr->priority = msg_linkprio(msg); |
4323add6 | 1511 | tipc_link_reset(l_ptr); /* Enforce change to take effect */ |
b97bf3fd PL |
1512 | break; |
1513 | } | |
ec37dcd3 JPM |
1514 | |
1515 | /* Record reception; force mismatch at next timeout: */ | |
1516 | l_ptr->checkpoint--; | |
1517 | ||
b97bf3fd PL |
1518 | link_state_event(l_ptr, TRAFFIC_MSG_EVT); |
1519 | l_ptr->stats.recv_states++; | |
1520 | if (link_reset_unknown(l_ptr)) | |
1521 | break; | |
1522 | ||
1523 | if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) { | |
c4307285 | 1524 | rec_gap = mod(msg_next_sent(msg) - |
b97bf3fd PL |
1525 | mod(l_ptr->next_in_no)); |
1526 | } | |
1527 | ||
1528 | max_pkt_ack = msg_max_pkt(msg); | |
c4307285 | 1529 | if (max_pkt_ack > l_ptr->max_pkt) { |
c4307285 YH |
1530 | l_ptr->max_pkt = max_pkt_ack; |
1531 | l_ptr->max_pkt_probes = 0; | |
1532 | } | |
b97bf3fd PL |
1533 | |
1534 | max_pkt_ack = 0; | |
c4307285 | 1535 | if (msg_probe(msg)) { |
b97bf3fd | 1536 | l_ptr->stats.recv_probes++; |
a016892c | 1537 | if (msg_size(msg) > sizeof(l_ptr->proto_msg)) |
c4307285 | 1538 | max_pkt_ack = msg_size(msg); |
c4307285 | 1539 | } |
b97bf3fd PL |
1540 | |
1541 | /* Protocol message before retransmits, reduce loss risk */ | |
389dd9bc | 1542 | if (l_ptr->owner->bclink.recv_permitted) |
c5898636 | 1543 | tipc_bclink_update_link_state(l_ptr->owner, |
7a54d4a9 | 1544 | msg_last_bcast(msg)); |
b97bf3fd PL |
1545 | |
1546 | if (rec_gap || (msg_probe(msg))) { | |
247f0f3c YX |
1547 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, rec_gap, 0, |
1548 | 0, max_pkt_ack); | |
b97bf3fd PL |
1549 | } |
1550 | if (msg_seq_gap(msg)) { | |
b97bf3fd | 1551 | l_ptr->stats.recv_nacks++; |
05dcc5aa | 1552 | tipc_link_retransmit(l_ptr, skb_peek(&l_ptr->transmq), |
4323add6 | 1553 | msg_seq_gap(msg)); |
b97bf3fd PL |
1554 | } |
1555 | break; | |
b97bf3fd PL |
1556 | } |
1557 | exit: | |
5f6d9123 | 1558 | kfree_skb(buf); |
b97bf3fd PL |
1559 | } |
1560 | ||
1561 | ||
170b3927 JPM |
1562 | /* tipc_link_tunnel_xmit(): Tunnel one packet via a link belonging to |
1563 | * a different bearer. Owner node is locked. | |
b97bf3fd | 1564 | */ |
170b3927 JPM |
1565 | static void tipc_link_tunnel_xmit(struct tipc_link *l_ptr, |
1566 | struct tipc_msg *tunnel_hdr, | |
1567 | struct tipc_msg *msg, | |
1568 | u32 selector) | |
b97bf3fd | 1569 | { |
a18c4bc3 | 1570 | struct tipc_link *tunnel; |
a6ca1094 | 1571 | struct sk_buff *skb; |
b97bf3fd PL |
1572 | u32 length = msg_size(msg); |
1573 | ||
1574 | tunnel = l_ptr->owner->active_links[selector & 1]; | |
5392d646 | 1575 | if (!tipc_link_is_up(tunnel)) { |
2cf8aa19 | 1576 | pr_warn("%stunnel link no longer available\n", link_co_err); |
b97bf3fd | 1577 | return; |
5392d646 | 1578 | } |
b97bf3fd | 1579 | msg_set_size(tunnel_hdr, length + INT_H_SIZE); |
a6ca1094 YX |
1580 | skb = tipc_buf_acquire(length + INT_H_SIZE); |
1581 | if (!skb) { | |
2cf8aa19 | 1582 | pr_warn("%sunable to send tunnel msg\n", link_co_err); |
b97bf3fd | 1583 | return; |
5392d646 | 1584 | } |
a6ca1094 YX |
1585 | skb_copy_to_linear_data(skb, tunnel_hdr, INT_H_SIZE); |
1586 | skb_copy_to_linear_data_offset(skb, INT_H_SIZE, msg, length); | |
1587 | __tipc_link_xmit_skb(tunnel, skb); | |
b97bf3fd PL |
1588 | } |
1589 | ||
1590 | ||
170b3927 JPM |
1591 | /* tipc_link_failover_send_queue(): A link has gone down, but a second |
1592 | * link is still active. We can do failover. Tunnel the failing link's | |
1593 | * whole send queue via the remaining link. This way, we don't lose | |
1594 | * any packets, and sequence order is preserved for subsequent traffic | |
1595 | * sent over the remaining link. Owner node is locked. | |
b97bf3fd | 1596 | */ |
170b3927 | 1597 | void tipc_link_failover_send_queue(struct tipc_link *l_ptr) |
b97bf3fd | 1598 | { |
05dcc5aa | 1599 | int msgcount; |
a18c4bc3 | 1600 | struct tipc_link *tunnel = l_ptr->owner->active_links[0]; |
b97bf3fd | 1601 | struct tipc_msg tunnel_hdr; |
58dc55f2 | 1602 | struct sk_buff *skb; |
5392d646 | 1603 | int split_bundles; |
b97bf3fd PL |
1604 | |
1605 | if (!tunnel) | |
1606 | return; | |
1607 | ||
c5898636 | 1608 | tipc_msg_init(link_own_addr(l_ptr), &tunnel_hdr, CHANGEOVER_PROTOCOL, |
34747539 | 1609 | ORIGINAL_MSG, INT_H_SIZE, l_ptr->addr); |
05dcc5aa JPM |
1610 | skb_queue_splice_tail_init(&l_ptr->backlogq, &l_ptr->transmq); |
1611 | msgcount = skb_queue_len(&l_ptr->transmq); | |
b97bf3fd PL |
1612 | msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id); |
1613 | msg_set_msgcnt(&tunnel_hdr, msgcount); | |
f131072c | 1614 | |
05dcc5aa | 1615 | if (skb_queue_empty(&l_ptr->transmq)) { |
58dc55f2 YX |
1616 | skb = tipc_buf_acquire(INT_H_SIZE); |
1617 | if (skb) { | |
1618 | skb_copy_to_linear_data(skb, &tunnel_hdr, INT_H_SIZE); | |
b97bf3fd | 1619 | msg_set_size(&tunnel_hdr, INT_H_SIZE); |
a6ca1094 | 1620 | __tipc_link_xmit_skb(tunnel, skb); |
b97bf3fd | 1621 | } else { |
2cf8aa19 EH |
1622 | pr_warn("%sunable to send changeover msg\n", |
1623 | link_co_err); | |
b97bf3fd PL |
1624 | } |
1625 | return; | |
1626 | } | |
f131072c | 1627 | |
c4307285 | 1628 | split_bundles = (l_ptr->owner->active_links[0] != |
5392d646 AS |
1629 | l_ptr->owner->active_links[1]); |
1630 | ||
05dcc5aa | 1631 | skb_queue_walk(&l_ptr->transmq, skb) { |
58dc55f2 | 1632 | struct tipc_msg *msg = buf_msg(skb); |
b97bf3fd PL |
1633 | |
1634 | if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) { | |
b97bf3fd | 1635 | struct tipc_msg *m = msg_get_wrapped(msg); |
0e65967e | 1636 | unchar *pos = (unchar *)m; |
b97bf3fd | 1637 | |
d788d805 | 1638 | msgcount = msg_msgcnt(msg); |
b97bf3fd | 1639 | while (msgcount--) { |
0e65967e | 1640 | msg_set_seqno(m, msg_seqno(msg)); |
170b3927 JPM |
1641 | tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, m, |
1642 | msg_link_selector(m)); | |
b97bf3fd PL |
1643 | pos += align(msg_size(m)); |
1644 | m = (struct tipc_msg *)pos; | |
1645 | } | |
1646 | } else { | |
170b3927 JPM |
1647 | tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, msg, |
1648 | msg_link_selector(msg)); | |
b97bf3fd | 1649 | } |
b97bf3fd PL |
1650 | } |
1651 | } | |
1652 | ||
247f0f3c | 1653 | /* tipc_link_dup_queue_xmit(): A second link has become active. Tunnel a |
170b3927 JPM |
1654 | * duplicate of the first link's send queue via the new link. This way, we |
1655 | * are guaranteed that currently queued packets from a socket are delivered | |
1656 | * before future traffic from the same socket, even if this is using the | |
1657 | * new link. The last arriving copy of each duplicate packet is dropped at | |
1658 | * the receiving end by the regular protocol check, so packet cardinality | |
1659 | * and sequence order is preserved per sender/receiver socket pair. | |
1660 | * Owner node is locked. | |
1661 | */ | |
05dcc5aa JPM |
1662 | void tipc_link_dup_queue_xmit(struct tipc_link *link, |
1663 | struct tipc_link *tnl) | |
b97bf3fd | 1664 | { |
58dc55f2 | 1665 | struct sk_buff *skb; |
05dcc5aa JPM |
1666 | struct tipc_msg tnl_hdr; |
1667 | struct sk_buff_head *queue = &link->transmq; | |
1668 | int mcnt; | |
1669 | ||
1670 | tipc_msg_init(link_own_addr(link), &tnl_hdr, CHANGEOVER_PROTOCOL, | |
1671 | DUPLICATE_MSG, INT_H_SIZE, link->addr); | |
1672 | mcnt = skb_queue_len(&link->transmq) + skb_queue_len(&link->backlogq); | |
1673 | msg_set_msgcnt(&tnl_hdr, mcnt); | |
1674 | msg_set_bearer_id(&tnl_hdr, link->peer_bearer_id); | |
1675 | ||
1676 | tunnel_queue: | |
1677 | skb_queue_walk(queue, skb) { | |
58dc55f2 YX |
1678 | struct sk_buff *outskb; |
1679 | struct tipc_msg *msg = buf_msg(skb); | |
05dcc5aa | 1680 | u32 len = msg_size(msg); |
b97bf3fd | 1681 | |
05dcc5aa JPM |
1682 | msg_set_ack(msg, mod(link->next_in_no - 1)); |
1683 | msg_set_bcast_ack(msg, link->owner->bclink.last_in); | |
1684 | msg_set_size(&tnl_hdr, len + INT_H_SIZE); | |
1685 | outskb = tipc_buf_acquire(len + INT_H_SIZE); | |
58dc55f2 | 1686 | if (outskb == NULL) { |
2cf8aa19 EH |
1687 | pr_warn("%sunable to send duplicate msg\n", |
1688 | link_co_err); | |
b97bf3fd PL |
1689 | return; |
1690 | } | |
05dcc5aa JPM |
1691 | skb_copy_to_linear_data(outskb, &tnl_hdr, INT_H_SIZE); |
1692 | skb_copy_to_linear_data_offset(outskb, INT_H_SIZE, | |
1693 | skb->data, len); | |
1694 | __tipc_link_xmit_skb(tnl, outskb); | |
1695 | if (!tipc_link_is_up(link)) | |
b97bf3fd | 1696 | return; |
b97bf3fd | 1697 | } |
05dcc5aa JPM |
1698 | if (queue == &link->backlogq) |
1699 | return; | |
1700 | queue = &link->backlogq; | |
1701 | goto tunnel_queue; | |
b97bf3fd PL |
1702 | } |
1703 | ||
1dab3d5a JPM |
1704 | /* tipc_link_dup_rcv(): Receive a tunnelled DUPLICATE_MSG packet. |
1705 | * Owner node is locked. | |
1706 | */ | |
c1336ee4 JPM |
1707 | static void tipc_link_dup_rcv(struct tipc_link *link, |
1708 | struct sk_buff *skb) | |
1dab3d5a | 1709 | { |
c1336ee4 JPM |
1710 | struct sk_buff *iskb; |
1711 | int pos = 0; | |
1dab3d5a | 1712 | |
c1336ee4 | 1713 | if (!tipc_link_is_up(link)) |
1dab3d5a JPM |
1714 | return; |
1715 | ||
c1336ee4 | 1716 | if (!tipc_msg_extract(skb, &iskb, &pos)) { |
1dab3d5a JPM |
1717 | pr_warn("%sfailed to extract inner dup pkt\n", link_co_err); |
1718 | return; | |
1719 | } | |
c1336ee4 JPM |
1720 | /* Append buffer to deferred queue, if applicable: */ |
1721 | link_handle_out_of_seq_msg(link, iskb); | |
1dab3d5a JPM |
1722 | } |
1723 | ||
f006c9c7 JPM |
1724 | /* tipc_link_failover_rcv(): Receive a tunnelled ORIGINAL_MSG packet |
1725 | * Owner node is locked. | |
1726 | */ | |
1727 | static struct sk_buff *tipc_link_failover_rcv(struct tipc_link *l_ptr, | |
1728 | struct sk_buff *t_buf) | |
1729 | { | |
1730 | struct tipc_msg *t_msg = buf_msg(t_buf); | |
1731 | struct sk_buff *buf = NULL; | |
1732 | struct tipc_msg *msg; | |
c1336ee4 | 1733 | int pos = 0; |
f006c9c7 JPM |
1734 | |
1735 | if (tipc_link_is_up(l_ptr)) | |
1736 | tipc_link_reset(l_ptr); | |
1737 | ||
1738 | /* First failover packet? */ | |
1739 | if (l_ptr->exp_msg_count == START_CHANGEOVER) | |
1740 | l_ptr->exp_msg_count = msg_msgcnt(t_msg); | |
1741 | ||
1742 | /* Should there be an inner packet? */ | |
1743 | if (l_ptr->exp_msg_count) { | |
1744 | l_ptr->exp_msg_count--; | |
c1336ee4 | 1745 | if (!tipc_msg_extract(t_buf, &buf, &pos)) { |
f006c9c7 JPM |
1746 | pr_warn("%sno inner failover pkt\n", link_co_err); |
1747 | goto exit; | |
1748 | } | |
1749 | msg = buf_msg(buf); | |
1750 | ||
1751 | if (less(msg_seqno(msg), l_ptr->reset_checkpoint)) { | |
1752 | kfree_skb(buf); | |
1753 | buf = NULL; | |
1754 | goto exit; | |
1755 | } | |
1756 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
1757 | l_ptr->stats.recv_fragments++; | |
37e22164 | 1758 | tipc_buf_append(&l_ptr->reasm_buf, &buf); |
f006c9c7 JPM |
1759 | } |
1760 | } | |
f006c9c7 | 1761 | exit: |
2d72d495 JPM |
1762 | if ((!l_ptr->exp_msg_count) && (l_ptr->flags & LINK_STOPPED)) |
1763 | tipc_link_delete(l_ptr); | |
f006c9c7 JPM |
1764 | return buf; |
1765 | } | |
1766 | ||
1dab3d5a | 1767 | /* tipc_link_tunnel_rcv(): Receive a tunnelled packet, sent |
170b3927 JPM |
1768 | * via other link as result of a failover (ORIGINAL_MSG) or |
1769 | * a new active link (DUPLICATE_MSG). Failover packets are | |
1770 | * returned to the active link for delivery upwards. | |
1771 | * Owner node is locked. | |
b97bf3fd | 1772 | */ |
c5898636 | 1773 | static int tipc_link_tunnel_rcv(struct tipc_node *n_ptr, |
170b3927 | 1774 | struct sk_buff **buf) |
b97bf3fd | 1775 | { |
02842f71 JPM |
1776 | struct sk_buff *t_buf = *buf; |
1777 | struct tipc_link *l_ptr; | |
1778 | struct tipc_msg *t_msg = buf_msg(t_buf); | |
1779 | u32 bearer_id = msg_bearer_id(t_msg); | |
b97bf3fd | 1780 | |
1e9d47a9 JPM |
1781 | *buf = NULL; |
1782 | ||
cb4b102f DC |
1783 | if (bearer_id >= MAX_BEARERS) |
1784 | goto exit; | |
1dab3d5a | 1785 | |
02842f71 JPM |
1786 | l_ptr = n_ptr->links[bearer_id]; |
1787 | if (!l_ptr) | |
b97bf3fd | 1788 | goto exit; |
b97bf3fd | 1789 | |
02842f71 | 1790 | if (msg_type(t_msg) == DUPLICATE_MSG) |
c5898636 | 1791 | tipc_link_dup_rcv(l_ptr, t_buf); |
02842f71 JPM |
1792 | else if (msg_type(t_msg) == ORIGINAL_MSG) |
1793 | *buf = tipc_link_failover_rcv(l_ptr, t_buf); | |
1e9d47a9 JPM |
1794 | else |
1795 | pr_warn("%sunknown tunnel pkt received\n", link_co_err); | |
b97bf3fd | 1796 | exit: |
02842f71 | 1797 | kfree_skb(t_buf); |
1e9d47a9 | 1798 | return *buf != NULL; |
b97bf3fd PL |
1799 | } |
1800 | ||
2f55c437 | 1801 | static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol) |
b97bf3fd | 1802 | { |
2f55c437 YX |
1803 | unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4; |
1804 | ||
1805 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
5413b4c6 AS |
1806 | return; |
1807 | ||
2f55c437 YX |
1808 | l_ptr->tolerance = tol; |
1809 | l_ptr->cont_intv = msecs_to_jiffies(intv); | |
1810 | l_ptr->abort_limit = tol / (jiffies_to_msecs(l_ptr->cont_intv) / 4); | |
b97bf3fd PL |
1811 | } |
1812 | ||
e3eea1eb | 1813 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
b97bf3fd | 1814 | { |
e3eea1eb JPM |
1815 | int max_bulk = TIPC_MAX_PUBLICATIONS / (l->max_pkt / ITEM_SIZE); |
1816 | ||
1817 | l->window = win; | |
1818 | l->queue_limit[TIPC_LOW_IMPORTANCE] = win / 2; | |
1819 | l->queue_limit[TIPC_MEDIUM_IMPORTANCE] = win; | |
1820 | l->queue_limit[TIPC_HIGH_IMPORTANCE] = win / 2 * 3; | |
1821 | l->queue_limit[TIPC_CRITICAL_IMPORTANCE] = win * 2; | |
1822 | l->queue_limit[TIPC_SYSTEM_IMPORTANCE] = max_bulk; | |
b97bf3fd PL |
1823 | } |
1824 | ||
e099e86c | 1825 | /* tipc_link_find_owner - locate owner node of link by link's name |
f2f9800d | 1826 | * @net: the applicable net namespace |
e099e86c JPM |
1827 | * @name: pointer to link name string |
1828 | * @bearer_id: pointer to index in 'node->links' array where the link was found. | |
c4307285 | 1829 | * |
e099e86c | 1830 | * Returns pointer to node owning the link, or 0 if no matching link is found. |
b97bf3fd | 1831 | */ |
f2f9800d YX |
1832 | static struct tipc_node *tipc_link_find_owner(struct net *net, |
1833 | const char *link_name, | |
e099e86c | 1834 | unsigned int *bearer_id) |
b97bf3fd | 1835 | { |
f2f9800d | 1836 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
a18c4bc3 | 1837 | struct tipc_link *l_ptr; |
bbfbe47c | 1838 | struct tipc_node *n_ptr; |
886eaa1f | 1839 | struct tipc_node *found_node = NULL; |
bbfbe47c | 1840 | int i; |
b97bf3fd | 1841 | |
e099e86c | 1842 | *bearer_id = 0; |
6c7a762e | 1843 | rcu_read_lock(); |
f2f9800d | 1844 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
a11607f5 | 1845 | tipc_node_lock(n_ptr); |
bbfbe47c EH |
1846 | for (i = 0; i < MAX_BEARERS; i++) { |
1847 | l_ptr = n_ptr->links[i]; | |
e099e86c JPM |
1848 | if (l_ptr && !strcmp(l_ptr->name, link_name)) { |
1849 | *bearer_id = i; | |
1850 | found_node = n_ptr; | |
1851 | break; | |
1852 | } | |
bbfbe47c | 1853 | } |
a11607f5 | 1854 | tipc_node_unlock(n_ptr); |
e099e86c JPM |
1855 | if (found_node) |
1856 | break; | |
bbfbe47c | 1857 | } |
6c7a762e YX |
1858 | rcu_read_unlock(); |
1859 | ||
e099e86c | 1860 | return found_node; |
b97bf3fd PL |
1861 | } |
1862 | ||
b97bf3fd PL |
1863 | /** |
1864 | * link_reset_statistics - reset link statistics | |
1865 | * @l_ptr: pointer to link | |
1866 | */ | |
a18c4bc3 | 1867 | static void link_reset_statistics(struct tipc_link *l_ptr) |
b97bf3fd PL |
1868 | { |
1869 | memset(&l_ptr->stats, 0, sizeof(l_ptr->stats)); | |
1870 | l_ptr->stats.sent_info = l_ptr->next_out_no; | |
1871 | l_ptr->stats.recv_info = l_ptr->next_in_no; | |
1872 | } | |
1873 | ||
a18c4bc3 | 1874 | static void link_print(struct tipc_link *l_ptr, const char *str) |
b97bf3fd | 1875 | { |
7f9f95d9 | 1876 | struct tipc_net *tn = net_generic(l_ptr->owner->net, tipc_net_id); |
7a2f7d18 YX |
1877 | struct tipc_bearer *b_ptr; |
1878 | ||
1879 | rcu_read_lock(); | |
7f9f95d9 | 1880 | b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]); |
7a2f7d18 YX |
1881 | if (b_ptr) |
1882 | pr_info("%s Link %x<%s>:", str, l_ptr->addr, b_ptr->name); | |
1883 | rcu_read_unlock(); | |
8d64a5ba | 1884 | |
b97bf3fd | 1885 | if (link_working_unknown(l_ptr)) |
5deedde9 | 1886 | pr_cont(":WU\n"); |
8d64a5ba | 1887 | else if (link_reset_reset(l_ptr)) |
5deedde9 | 1888 | pr_cont(":RR\n"); |
8d64a5ba | 1889 | else if (link_reset_unknown(l_ptr)) |
5deedde9 | 1890 | pr_cont(":RU\n"); |
8d64a5ba | 1891 | else if (link_working_working(l_ptr)) |
5deedde9 PG |
1892 | pr_cont(":WW\n"); |
1893 | else | |
1894 | pr_cont("\n"); | |
b97bf3fd | 1895 | } |
0655f6a8 RA |
1896 | |
1897 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
1898 | */ | |
1899 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
1900 | { | |
1901 | int err; | |
1902 | ||
1903 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
1904 | tipc_nl_prop_policy); | |
1905 | if (err) | |
1906 | return err; | |
1907 | ||
1908 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1909 | u32 prio; | |
1910 | ||
1911 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1912 | if (prio > TIPC_MAX_LINK_PRI) | |
1913 | return -EINVAL; | |
1914 | } | |
1915 | ||
1916 | if (props[TIPC_NLA_PROP_TOL]) { | |
1917 | u32 tol; | |
1918 | ||
1919 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1920 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
1921 | return -EINVAL; | |
1922 | } | |
1923 | ||
1924 | if (props[TIPC_NLA_PROP_WIN]) { | |
1925 | u32 win; | |
1926 | ||
1927 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1928 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
1929 | return -EINVAL; | |
1930 | } | |
1931 | ||
1932 | return 0; | |
1933 | } | |
7be57fc6 | 1934 | |
f96ce7a2 RA |
1935 | int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info) |
1936 | { | |
1937 | int err; | |
1938 | int res = 0; | |
1939 | int bearer_id; | |
1940 | char *name; | |
1941 | struct tipc_link *link; | |
1942 | struct tipc_node *node; | |
1943 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
37e2d484 | 1944 | struct net *net = sock_net(skb->sk); |
f96ce7a2 RA |
1945 | |
1946 | if (!info->attrs[TIPC_NLA_LINK]) | |
1947 | return -EINVAL; | |
1948 | ||
1949 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
1950 | info->attrs[TIPC_NLA_LINK], | |
1951 | tipc_nl_link_policy); | |
1952 | if (err) | |
1953 | return err; | |
1954 | ||
1955 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
1956 | return -EINVAL; | |
1957 | ||
1958 | name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
1959 | ||
f2f9800d | 1960 | node = tipc_link_find_owner(net, name, &bearer_id); |
f96ce7a2 RA |
1961 | if (!node) |
1962 | return -EINVAL; | |
1963 | ||
1964 | tipc_node_lock(node); | |
1965 | ||
1966 | link = node->links[bearer_id]; | |
1967 | if (!link) { | |
1968 | res = -EINVAL; | |
1969 | goto out; | |
1970 | } | |
1971 | ||
1972 | if (attrs[TIPC_NLA_LINK_PROP]) { | |
1973 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; | |
1974 | ||
1975 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], | |
1976 | props); | |
1977 | if (err) { | |
1978 | res = err; | |
1979 | goto out; | |
1980 | } | |
1981 | ||
1982 | if (props[TIPC_NLA_PROP_TOL]) { | |
1983 | u32 tol; | |
1984 | ||
1985 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1986 | link_set_supervision_props(link, tol); | |
1987 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0, 0); | |
1988 | } | |
1989 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1990 | u32 prio; | |
1991 | ||
1992 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1993 | link->priority = prio; | |
1994 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio, 0); | |
1995 | } | |
1996 | if (props[TIPC_NLA_PROP_WIN]) { | |
1997 | u32 win; | |
1998 | ||
1999 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
2000 | tipc_link_set_queue_limits(link, win); | |
2001 | } | |
2002 | } | |
2003 | ||
2004 | out: | |
2005 | tipc_node_unlock(node); | |
2006 | ||
2007 | return res; | |
2008 | } | |
d8182804 RA |
2009 | |
2010 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) | |
7be57fc6 RA |
2011 | { |
2012 | int i; | |
2013 | struct nlattr *stats; | |
2014 | ||
2015 | struct nla_map { | |
2016 | u32 key; | |
2017 | u32 val; | |
2018 | }; | |
2019 | ||
2020 | struct nla_map map[] = { | |
2021 | {TIPC_NLA_STATS_RX_INFO, s->recv_info}, | |
2022 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, | |
2023 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
2024 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
2025 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
2026 | {TIPC_NLA_STATS_TX_INFO, s->sent_info}, | |
2027 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, | |
2028 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
2029 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
2030 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
2031 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
2032 | s->msg_length_counts : 1}, | |
2033 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
2034 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
2035 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
2036 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
2037 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
2038 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
2039 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
2040 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
2041 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
2042 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
2043 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
2044 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
2045 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
2046 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
2047 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
2048 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
2049 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
2050 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
2051 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
2052 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
2053 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
2054 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
2055 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
2056 | }; | |
2057 | ||
2058 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
2059 | if (!stats) | |
2060 | return -EMSGSIZE; | |
2061 | ||
2062 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
2063 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
2064 | goto msg_full; | |
2065 | ||
2066 | nla_nest_end(skb, stats); | |
2067 | ||
2068 | return 0; | |
2069 | msg_full: | |
2070 | nla_nest_cancel(skb, stats); | |
2071 | ||
2072 | return -EMSGSIZE; | |
2073 | } | |
2074 | ||
2075 | /* Caller should hold appropriate locks to protect the link */ | |
34747539 YX |
2076 | static int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
2077 | struct tipc_link *link) | |
7be57fc6 RA |
2078 | { |
2079 | int err; | |
2080 | void *hdr; | |
2081 | struct nlattr *attrs; | |
2082 | struct nlattr *prop; | |
34747539 | 2083 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
7be57fc6 | 2084 | |
bfb3e5dd | 2085 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
7be57fc6 RA |
2086 | NLM_F_MULTI, TIPC_NL_LINK_GET); |
2087 | if (!hdr) | |
2088 | return -EMSGSIZE; | |
2089 | ||
2090 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
2091 | if (!attrs) | |
2092 | goto msg_full; | |
2093 | ||
2094 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
2095 | goto attr_msg_full; | |
2096 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, | |
34747539 | 2097 | tipc_cluster_mask(tn->own_addr))) |
7be57fc6 RA |
2098 | goto attr_msg_full; |
2099 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->max_pkt)) | |
2100 | goto attr_msg_full; | |
2101 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->next_in_no)) | |
2102 | goto attr_msg_full; | |
2103 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->next_out_no)) | |
2104 | goto attr_msg_full; | |
2105 | ||
2106 | if (tipc_link_is_up(link)) | |
2107 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2108 | goto attr_msg_full; | |
2109 | if (tipc_link_is_active(link)) | |
2110 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) | |
2111 | goto attr_msg_full; | |
2112 | ||
2113 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
2114 | if (!prop) | |
2115 | goto attr_msg_full; | |
2116 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2117 | goto prop_msg_full; | |
2118 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
2119 | goto prop_msg_full; | |
2120 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
2121 | link->queue_limit[TIPC_LOW_IMPORTANCE])) | |
2122 | goto prop_msg_full; | |
2123 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2124 | goto prop_msg_full; | |
2125 | nla_nest_end(msg->skb, prop); | |
2126 | ||
2127 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
2128 | if (err) | |
2129 | goto attr_msg_full; | |
2130 | ||
2131 | nla_nest_end(msg->skb, attrs); | |
2132 | genlmsg_end(msg->skb, hdr); | |
2133 | ||
2134 | return 0; | |
2135 | ||
2136 | prop_msg_full: | |
2137 | nla_nest_cancel(msg->skb, prop); | |
2138 | attr_msg_full: | |
2139 | nla_nest_cancel(msg->skb, attrs); | |
2140 | msg_full: | |
2141 | genlmsg_cancel(msg->skb, hdr); | |
2142 | ||
2143 | return -EMSGSIZE; | |
2144 | } | |
2145 | ||
2146 | /* Caller should hold node lock */ | |
34747539 YX |
2147 | static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg, |
2148 | struct tipc_node *node, u32 *prev_link) | |
7be57fc6 RA |
2149 | { |
2150 | u32 i; | |
2151 | int err; | |
2152 | ||
2153 | for (i = *prev_link; i < MAX_BEARERS; i++) { | |
2154 | *prev_link = i; | |
2155 | ||
2156 | if (!node->links[i]) | |
2157 | continue; | |
2158 | ||
34747539 | 2159 | err = __tipc_nl_add_link(net, msg, node->links[i]); |
7be57fc6 RA |
2160 | if (err) |
2161 | return err; | |
2162 | } | |
2163 | *prev_link = 0; | |
2164 | ||
2165 | return 0; | |
2166 | } | |
2167 | ||
2168 | int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2169 | { | |
f2f9800d YX |
2170 | struct net *net = sock_net(skb->sk); |
2171 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
7be57fc6 RA |
2172 | struct tipc_node *node; |
2173 | struct tipc_nl_msg msg; | |
2174 | u32 prev_node = cb->args[0]; | |
2175 | u32 prev_link = cb->args[1]; | |
2176 | int done = cb->args[2]; | |
2177 | int err; | |
2178 | ||
2179 | if (done) | |
2180 | return 0; | |
2181 | ||
2182 | msg.skb = skb; | |
2183 | msg.portid = NETLINK_CB(cb->skb).portid; | |
2184 | msg.seq = cb->nlh->nlmsg_seq; | |
2185 | ||
2186 | rcu_read_lock(); | |
2187 | ||
2188 | if (prev_node) { | |
f2f9800d | 2189 | node = tipc_node_find(net, prev_node); |
7be57fc6 RA |
2190 | if (!node) { |
2191 | /* We never set seq or call nl_dump_check_consistent() | |
2192 | * this means that setting prev_seq here will cause the | |
2193 | * consistence check to fail in the netlink callback | |
2194 | * handler. Resulting in the last NLMSG_DONE message | |
2195 | * having the NLM_F_DUMP_INTR flag set. | |
2196 | */ | |
2197 | cb->prev_seq = 1; | |
2198 | goto out; | |
2199 | } | |
2200 | ||
f2f9800d YX |
2201 | list_for_each_entry_continue_rcu(node, &tn->node_list, |
2202 | list) { | |
7be57fc6 | 2203 | tipc_node_lock(node); |
34747539 YX |
2204 | err = __tipc_nl_add_node_links(net, &msg, node, |
2205 | &prev_link); | |
7be57fc6 RA |
2206 | tipc_node_unlock(node); |
2207 | if (err) | |
2208 | goto out; | |
2209 | ||
2210 | prev_node = node->addr; | |
2211 | } | |
2212 | } else { | |
1da46568 | 2213 | err = tipc_nl_add_bc_link(net, &msg); |
7be57fc6 RA |
2214 | if (err) |
2215 | goto out; | |
2216 | ||
f2f9800d | 2217 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
7be57fc6 | 2218 | tipc_node_lock(node); |
34747539 YX |
2219 | err = __tipc_nl_add_node_links(net, &msg, node, |
2220 | &prev_link); | |
7be57fc6 RA |
2221 | tipc_node_unlock(node); |
2222 | if (err) | |
2223 | goto out; | |
2224 | ||
2225 | prev_node = node->addr; | |
2226 | } | |
2227 | } | |
2228 | done = 1; | |
2229 | out: | |
2230 | rcu_read_unlock(); | |
2231 | ||
2232 | cb->args[0] = prev_node; | |
2233 | cb->args[1] = prev_link; | |
2234 | cb->args[2] = done; | |
2235 | ||
2236 | return skb->len; | |
2237 | } | |
2238 | ||
2239 | int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info) | |
2240 | { | |
f2f9800d | 2241 | struct net *net = genl_info_net(info); |
7be57fc6 RA |
2242 | struct sk_buff *ans_skb; |
2243 | struct tipc_nl_msg msg; | |
2244 | struct tipc_link *link; | |
2245 | struct tipc_node *node; | |
2246 | char *name; | |
2247 | int bearer_id; | |
2248 | int err; | |
2249 | ||
2250 | if (!info->attrs[TIPC_NLA_LINK_NAME]) | |
2251 | return -EINVAL; | |
2252 | ||
2253 | name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]); | |
f2f9800d | 2254 | node = tipc_link_find_owner(net, name, &bearer_id); |
7be57fc6 RA |
2255 | if (!node) |
2256 | return -EINVAL; | |
2257 | ||
2258 | ans_skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
2259 | if (!ans_skb) | |
2260 | return -ENOMEM; | |
2261 | ||
2262 | msg.skb = ans_skb; | |
2263 | msg.portid = info->snd_portid; | |
2264 | msg.seq = info->snd_seq; | |
2265 | ||
2266 | tipc_node_lock(node); | |
2267 | link = node->links[bearer_id]; | |
2268 | if (!link) { | |
2269 | err = -EINVAL; | |
2270 | goto err_out; | |
2271 | } | |
2272 | ||
34747539 | 2273 | err = __tipc_nl_add_link(net, &msg, link); |
7be57fc6 RA |
2274 | if (err) |
2275 | goto err_out; | |
2276 | ||
2277 | tipc_node_unlock(node); | |
2278 | ||
2279 | return genlmsg_reply(ans_skb, info); | |
2280 | ||
2281 | err_out: | |
2282 | tipc_node_unlock(node); | |
2283 | nlmsg_free(ans_skb); | |
2284 | ||
2285 | return err; | |
2286 | } | |
ae36342b RA |
2287 | |
2288 | int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info) | |
2289 | { | |
2290 | int err; | |
2291 | char *link_name; | |
2292 | unsigned int bearer_id; | |
2293 | struct tipc_link *link; | |
2294 | struct tipc_node *node; | |
2295 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
1817877b | 2296 | struct net *net = sock_net(skb->sk); |
ae36342b RA |
2297 | |
2298 | if (!info->attrs[TIPC_NLA_LINK]) | |
2299 | return -EINVAL; | |
2300 | ||
2301 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
2302 | info->attrs[TIPC_NLA_LINK], | |
2303 | tipc_nl_link_policy); | |
2304 | if (err) | |
2305 | return err; | |
2306 | ||
2307 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
2308 | return -EINVAL; | |
2309 | ||
2310 | link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
2311 | ||
2312 | if (strcmp(link_name, tipc_bclink_name) == 0) { | |
1da46568 | 2313 | err = tipc_bclink_reset_stats(net); |
ae36342b RA |
2314 | if (err) |
2315 | return err; | |
2316 | return 0; | |
2317 | } | |
2318 | ||
f2f9800d | 2319 | node = tipc_link_find_owner(net, link_name, &bearer_id); |
ae36342b RA |
2320 | if (!node) |
2321 | return -EINVAL; | |
2322 | ||
2323 | tipc_node_lock(node); | |
2324 | ||
2325 | link = node->links[bearer_id]; | |
2326 | if (!link) { | |
2327 | tipc_node_unlock(node); | |
2328 | return -EINVAL; | |
2329 | } | |
2330 | ||
2331 | link_reset_statistics(link); | |
2332 | ||
2333 | tipc_node_unlock(node); | |
2334 | ||
2335 | return 0; | |
2336 | } |