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Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/link.c: TIPC link code | |
c4307285 | 3 | * |
c1336ee4 | 4 | * Copyright (c) 1996-2007, 2012-2015, Ericsson AB |
198d73b8 | 5 | * Copyright (c) 2004-2007, 2010-2013, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the names of the copyright holders nor the names of its | |
17 | * contributors may be used to endorse or promote products derived from | |
18 | * this software without specific prior written permission. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
20 | * Alternatively, this software may be distributed under the terms of the |
21 | * GNU General Public License ("GPL") version 2 as published by the Free | |
22 | * Software Foundation. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
37 | #include "core.h" | |
e3eea1eb | 38 | #include "subscr.h" |
b97bf3fd | 39 | #include "link.h" |
7be57fc6 | 40 | #include "bcast.h" |
9816f061 | 41 | #include "socket.h" |
b97bf3fd | 42 | #include "name_distr.h" |
b97bf3fd | 43 | #include "discover.h" |
0655f6a8 | 44 | #include "netlink.h" |
b97bf3fd | 45 | |
796c75d0 YX |
46 | #include <linux/pkt_sched.h> |
47 | ||
2cf8aa19 EH |
48 | /* |
49 | * Error message prefixes | |
50 | */ | |
51 | static const char *link_co_err = "Link changeover error, "; | |
52 | static const char *link_rst_msg = "Resetting link "; | |
53 | static const char *link_unk_evt = "Unknown link event "; | |
b97bf3fd | 54 | |
7be57fc6 RA |
55 | static const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = { |
56 | [TIPC_NLA_LINK_UNSPEC] = { .type = NLA_UNSPEC }, | |
57 | [TIPC_NLA_LINK_NAME] = { | |
58 | .type = NLA_STRING, | |
59 | .len = TIPC_MAX_LINK_NAME | |
60 | }, | |
61 | [TIPC_NLA_LINK_MTU] = { .type = NLA_U32 }, | |
62 | [TIPC_NLA_LINK_BROADCAST] = { .type = NLA_FLAG }, | |
63 | [TIPC_NLA_LINK_UP] = { .type = NLA_FLAG }, | |
64 | [TIPC_NLA_LINK_ACTIVE] = { .type = NLA_FLAG }, | |
65 | [TIPC_NLA_LINK_PROP] = { .type = NLA_NESTED }, | |
66 | [TIPC_NLA_LINK_STATS] = { .type = NLA_NESTED }, | |
67 | [TIPC_NLA_LINK_RX] = { .type = NLA_U32 }, | |
68 | [TIPC_NLA_LINK_TX] = { .type = NLA_U32 } | |
69 | }; | |
70 | ||
0655f6a8 RA |
71 | /* Properties valid for media, bearar and link */ |
72 | static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = { | |
73 | [TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC }, | |
74 | [TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 }, | |
75 | [TIPC_NLA_PROP_TOL] = { .type = NLA_U32 }, | |
76 | [TIPC_NLA_PROP_WIN] = { .type = NLA_U32 } | |
77 | }; | |
78 | ||
a686e685 AS |
79 | /* |
80 | * Out-of-range value for link session numbers | |
81 | */ | |
a686e685 AS |
82 | #define INVALID_SESSION 0x10000 |
83 | ||
c4307285 YH |
84 | /* |
85 | * Link state events: | |
b97bf3fd | 86 | */ |
b97bf3fd PL |
87 | #define STARTING_EVT 856384768 /* link processing trigger */ |
88 | #define TRAFFIC_MSG_EVT 560815u /* rx'd ??? */ | |
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 | 313 | l_ptr->next_out_no = 1; |
05dcc5aa JPM |
314 | __skb_queue_head_init(&l_ptr->transmq); |
315 | __skb_queue_head_init(&l_ptr->backlogq); | |
316 | __skb_queue_head_init(&l_ptr->deferdq); | |
c637c103 JPM |
317 | skb_queue_head_init(&l_ptr->wakeupq); |
318 | skb_queue_head_init(&l_ptr->inputq); | |
319 | skb_queue_head_init(&l_ptr->namedq); | |
b97bf3fd | 320 | link_reset_statistics(l_ptr); |
37b9c08a | 321 | tipc_node_attach_link(n_ptr, l_ptr); |
2f55c437 | 322 | setup_timer(&l_ptr->timer, link_timeout, (unsigned long)l_ptr); |
581465fa | 323 | link_state_event(l_ptr, STARTING_EVT); |
b97bf3fd | 324 | |
b97bf3fd PL |
325 | return l_ptr; |
326 | } | |
327 | ||
2d72d495 JPM |
328 | /** |
329 | * link_delete - Conditional deletion of link. | |
330 | * If timer still running, real delete is done when it expires | |
331 | * @link: link to be deleted | |
332 | */ | |
333 | void tipc_link_delete(struct tipc_link *link) | |
334 | { | |
335 | tipc_link_reset_fragments(link); | |
336 | tipc_node_detach_link(link->owner, link); | |
337 | tipc_link_put(link); | |
338 | } | |
339 | ||
f2f9800d YX |
340 | void tipc_link_delete_list(struct net *net, unsigned int bearer_id, |
341 | bool shutting_down) | |
8d8439b6 | 342 | { |
f2f9800d | 343 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
2d72d495 JPM |
344 | struct tipc_link *link; |
345 | struct tipc_node *node; | |
169bf912 | 346 | bool del_link; |
8d8439b6 | 347 | |
6c7a762e | 348 | rcu_read_lock(); |
2d72d495 JPM |
349 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
350 | tipc_node_lock(node); | |
351 | link = node->links[bearer_id]; | |
352 | if (!link) { | |
353 | tipc_node_unlock(node); | |
c61dd61d YX |
354 | continue; |
355 | } | |
169bf912 | 356 | del_link = !tipc_link_is_up(link) && !link->exp_msg_count; |
2d72d495 JPM |
357 | tipc_link_reset(link); |
358 | if (del_timer(&link->timer)) | |
359 | tipc_link_put(link); | |
360 | link->flags |= LINK_STOPPED; | |
361 | /* Delete link now, or when failover is finished: */ | |
169bf912 | 362 | if (shutting_down || !tipc_node_is_up(node) || del_link) |
2d72d495 JPM |
363 | tipc_link_delete(link); |
364 | tipc_node_unlock(node); | |
8d8439b6 | 365 | } |
6c7a762e | 366 | rcu_read_unlock(); |
8d8439b6 | 367 | } |
b97bf3fd PL |
368 | |
369 | /** | |
50100a5e JPM |
370 | * link_schedule_user - schedule user for wakeup after congestion |
371 | * @link: congested link | |
372 | * @oport: sending port | |
373 | * @chain_sz: size of buffer chain that was attempted sent | |
374 | * @imp: importance of message attempted sent | |
375 | * Create pseudo msg to send back to user when congestion abates | |
b97bf3fd | 376 | */ |
50100a5e JPM |
377 | static bool link_schedule_user(struct tipc_link *link, u32 oport, |
378 | uint chain_sz, uint imp) | |
b97bf3fd | 379 | { |
50100a5e JPM |
380 | struct sk_buff *buf; |
381 | ||
c5898636 JPM |
382 | buf = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, |
383 | link_own_addr(link), link_own_addr(link), | |
384 | oport, 0, 0); | |
50100a5e JPM |
385 | if (!buf) |
386 | return false; | |
387 | TIPC_SKB_CB(buf)->chain_sz = chain_sz; | |
388 | TIPC_SKB_CB(buf)->chain_imp = imp; | |
c637c103 | 389 | skb_queue_tail(&link->wakeupq, buf); |
50100a5e JPM |
390 | link->stats.link_congs++; |
391 | return true; | |
b97bf3fd PL |
392 | } |
393 | ||
50100a5e JPM |
394 | /** |
395 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
396 | * @link: congested link | |
397 | * Move a number of waiting users, as permitted by available space in | |
398 | * the send queue, from link wait queue to node wait queue for wakeup | |
399 | */ | |
1f66d161 | 400 | void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 401 | { |
1f66d161 JPM |
402 | int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,}; |
403 | int imp, lim; | |
58d78b32 | 404 | struct sk_buff *skb, *tmp; |
50100a5e | 405 | |
1f66d161 JPM |
406 | skb_queue_walk_safe(&l->wakeupq, skb, tmp) { |
407 | imp = TIPC_SKB_CB(skb)->chain_imp; | |
408 | lim = l->window + l->backlog[imp].limit; | |
409 | pnd[imp] += TIPC_SKB_CB(skb)->chain_sz; | |
410 | if ((pnd[imp] + l->backlog[imp].len) >= lim) | |
b97bf3fd | 411 | break; |
1f66d161 JPM |
412 | skb_unlink(skb, &l->wakeupq); |
413 | skb_queue_tail(&l->inputq, skb); | |
414 | l->owner->inputq = &l->inputq; | |
415 | l->owner->action_flags |= TIPC_MSG_EVT; | |
b97bf3fd | 416 | } |
b97bf3fd PL |
417 | } |
418 | ||
b97bf3fd | 419 | /** |
4323add6 | 420 | * tipc_link_reset_fragments - purge link's inbound message fragments queue |
b97bf3fd PL |
421 | * @l_ptr: pointer to link |
422 | */ | |
a18c4bc3 | 423 | void tipc_link_reset_fragments(struct tipc_link *l_ptr) |
b97bf3fd | 424 | { |
37e22164 JPM |
425 | kfree_skb(l_ptr->reasm_buf); |
426 | l_ptr->reasm_buf = NULL; | |
b97bf3fd PL |
427 | } |
428 | ||
1f66d161 JPM |
429 | static void tipc_link_purge_backlog(struct tipc_link *l) |
430 | { | |
431 | __skb_queue_purge(&l->backlogq); | |
432 | l->backlog[TIPC_LOW_IMPORTANCE].len = 0; | |
433 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0; | |
434 | l->backlog[TIPC_HIGH_IMPORTANCE].len = 0; | |
435 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0; | |
436 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0; | |
437 | } | |
438 | ||
c4307285 | 439 | /** |
581465fa | 440 | * tipc_link_purge_queues - purge all pkt queues associated with link |
b97bf3fd PL |
441 | * @l_ptr: pointer to link |
442 | */ | |
581465fa | 443 | void tipc_link_purge_queues(struct tipc_link *l_ptr) |
b97bf3fd | 444 | { |
05dcc5aa JPM |
445 | __skb_queue_purge(&l_ptr->deferdq); |
446 | __skb_queue_purge(&l_ptr->transmq); | |
1f66d161 | 447 | tipc_link_purge_backlog(l_ptr); |
4323add6 | 448 | tipc_link_reset_fragments(l_ptr); |
b97bf3fd PL |
449 | } |
450 | ||
a18c4bc3 | 451 | void tipc_link_reset(struct tipc_link *l_ptr) |
b97bf3fd | 452 | { |
b97bf3fd PL |
453 | u32 prev_state = l_ptr->state; |
454 | u32 checkpoint = l_ptr->next_in_no; | |
5392d646 | 455 | int was_active_link = tipc_link_is_active(l_ptr); |
50100a5e | 456 | struct tipc_node *owner = l_ptr->owner; |
c4307285 | 457 | |
a686e685 | 458 | msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff)); |
b97bf3fd | 459 | |
a686e685 AS |
460 | /* Link is down, accept any session */ |
461 | l_ptr->peer_session = INVALID_SESSION; | |
b97bf3fd | 462 | |
c4307285 | 463 | /* Prepare for max packet size negotiation */ |
b97bf3fd | 464 | link_init_max_pkt(l_ptr); |
c4307285 | 465 | |
b97bf3fd | 466 | l_ptr->state = RESET_UNKNOWN; |
b97bf3fd PL |
467 | |
468 | if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET)) | |
469 | return; | |
470 | ||
4323add6 | 471 | tipc_node_link_down(l_ptr->owner, l_ptr); |
7f9f95d9 | 472 | tipc_bearer_remove_dest(owner->net, l_ptr->bearer_id, l_ptr->addr); |
7368ddf1 | 473 | |
b9d4c339 | 474 | if (was_active_link && tipc_node_active_links(l_ptr->owner)) { |
b97bf3fd PL |
475 | l_ptr->reset_checkpoint = checkpoint; |
476 | l_ptr->exp_msg_count = START_CHANGEOVER; | |
477 | } | |
478 | ||
c637c103 | 479 | /* Clean up all queues, except inputq: */ |
05dcc5aa | 480 | __skb_queue_purge(&l_ptr->transmq); |
05dcc5aa | 481 | __skb_queue_purge(&l_ptr->deferdq); |
e6441bae JPM |
482 | if (!owner->inputq) |
483 | owner->inputq = &l_ptr->inputq; | |
484 | skb_queue_splice_init(&l_ptr->wakeupq, owner->inputq); | |
485 | if (!skb_queue_empty(owner->inputq)) | |
c637c103 | 486 | owner->action_flags |= TIPC_MSG_EVT; |
1f66d161 | 487 | tipc_link_purge_backlog(l_ptr); |
05dcc5aa | 488 | l_ptr->rcv_unacked = 0; |
b97bf3fd PL |
489 | l_ptr->checkpoint = 1; |
490 | l_ptr->next_out_no = 1; | |
b97bf3fd PL |
491 | l_ptr->fsm_msg_cnt = 0; |
492 | l_ptr->stale_count = 0; | |
493 | link_reset_statistics(l_ptr); | |
b97bf3fd PL |
494 | } |
495 | ||
f2f9800d | 496 | void tipc_link_reset_list(struct net *net, unsigned int bearer_id) |
e0ca2c30 | 497 | { |
f2f9800d | 498 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
e0ca2c30 | 499 | struct tipc_link *l_ptr; |
c61dd61d | 500 | struct tipc_node *n_ptr; |
e0ca2c30 | 501 | |
6c7a762e | 502 | rcu_read_lock(); |
f2f9800d | 503 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
5356f3d7 | 504 | tipc_node_lock(n_ptr); |
c61dd61d YX |
505 | l_ptr = n_ptr->links[bearer_id]; |
506 | if (l_ptr) | |
507 | tipc_link_reset(l_ptr); | |
5356f3d7 | 508 | tipc_node_unlock(n_ptr); |
e0ca2c30 | 509 | } |
6c7a762e | 510 | rcu_read_unlock(); |
e0ca2c30 | 511 | } |
b97bf3fd | 512 | |
7f9f95d9 | 513 | static void link_activate(struct tipc_link *link) |
b97bf3fd | 514 | { |
7f9f95d9 YX |
515 | struct tipc_node *node = link->owner; |
516 | ||
517 | link->next_in_no = 1; | |
518 | link->stats.recv_info = 1; | |
519 | tipc_node_link_up(node, link); | |
520 | tipc_bearer_add_dest(node->net, link->bearer_id, link->addr); | |
b97bf3fd PL |
521 | } |
522 | ||
523 | /** | |
524 | * link_state_event - link finite state machine | |
525 | * @l_ptr: pointer to link | |
526 | * @event: state machine event to process | |
527 | */ | |
95c96174 | 528 | static void link_state_event(struct tipc_link *l_ptr, unsigned int event) |
b97bf3fd | 529 | { |
a18c4bc3 | 530 | struct tipc_link *other; |
2f55c437 | 531 | unsigned long cont_intv = l_ptr->cont_intv; |
b97bf3fd | 532 | |
7d33939f JPM |
533 | if (l_ptr->flags & LINK_STOPPED) |
534 | return; | |
535 | ||
135daee6 | 536 | if (!(l_ptr->flags & LINK_STARTED) && (event != STARTING_EVT)) |
b97bf3fd PL |
537 | return; /* Not yet. */ |
538 | ||
77a7e07a YX |
539 | /* Check whether changeover is going on */ |
540 | if (l_ptr->exp_msg_count) { | |
a016892c | 541 | if (event == TIMEOUT_EVT) |
b97bf3fd | 542 | link_set_timer(l_ptr, cont_intv); |
77a7e07a | 543 | return; |
b97bf3fd | 544 | } |
b97bf3fd PL |
545 | |
546 | switch (l_ptr->state) { | |
547 | case WORKING_WORKING: | |
b97bf3fd PL |
548 | switch (event) { |
549 | case TRAFFIC_MSG_EVT: | |
b97bf3fd | 550 | case ACTIVATE_MSG: |
b97bf3fd PL |
551 | break; |
552 | case TIMEOUT_EVT: | |
b97bf3fd PL |
553 | if (l_ptr->next_in_no != l_ptr->checkpoint) { |
554 | l_ptr->checkpoint = l_ptr->next_in_no; | |
4323add6 | 555 | if (tipc_bclink_acks_missing(l_ptr->owner)) { |
247f0f3c YX |
556 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
557 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
558 | l_ptr->fsm_msg_cnt++; |
559 | } else if (l_ptr->max_pkt < l_ptr->max_pkt_target) { | |
247f0f3c YX |
560 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
561 | 1, 0, 0, 0, 0); | |
b97bf3fd PL |
562 | l_ptr->fsm_msg_cnt++; |
563 | } | |
564 | link_set_timer(l_ptr, cont_intv); | |
565 | break; | |
566 | } | |
b97bf3fd PL |
567 | l_ptr->state = WORKING_UNKNOWN; |
568 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c | 569 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0); |
b97bf3fd PL |
570 | l_ptr->fsm_msg_cnt++; |
571 | link_set_timer(l_ptr, cont_intv / 4); | |
572 | break; | |
573 | case RESET_MSG: | |
3fa9cacd EH |
574 | pr_debug("%s<%s>, requested by peer\n", |
575 | link_rst_msg, l_ptr->name); | |
4323add6 | 576 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
577 | l_ptr->state = RESET_RESET; |
578 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
579 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
580 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
581 | l_ptr->fsm_msg_cnt++; |
582 | link_set_timer(l_ptr, cont_intv); | |
583 | break; | |
584 | default: | |
3fa9cacd | 585 | pr_debug("%s%u in WW state\n", link_unk_evt, event); |
b97bf3fd PL |
586 | } |
587 | break; | |
588 | case WORKING_UNKNOWN: | |
b97bf3fd PL |
589 | switch (event) { |
590 | case TRAFFIC_MSG_EVT: | |
b97bf3fd | 591 | case ACTIVATE_MSG: |
b97bf3fd PL |
592 | l_ptr->state = WORKING_WORKING; |
593 | l_ptr->fsm_msg_cnt = 0; | |
594 | link_set_timer(l_ptr, cont_intv); | |
595 | break; | |
596 | case RESET_MSG: | |
3fa9cacd EH |
597 | pr_debug("%s<%s>, requested by peer while probing\n", |
598 | link_rst_msg, l_ptr->name); | |
4323add6 | 599 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
600 | l_ptr->state = RESET_RESET; |
601 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
602 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
603 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
604 | l_ptr->fsm_msg_cnt++; |
605 | link_set_timer(l_ptr, cont_intv); | |
606 | break; | |
607 | case TIMEOUT_EVT: | |
b97bf3fd | 608 | if (l_ptr->next_in_no != l_ptr->checkpoint) { |
b97bf3fd PL |
609 | l_ptr->state = WORKING_WORKING; |
610 | l_ptr->fsm_msg_cnt = 0; | |
611 | l_ptr->checkpoint = l_ptr->next_in_no; | |
4323add6 | 612 | if (tipc_bclink_acks_missing(l_ptr->owner)) { |
247f0f3c YX |
613 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
614 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
615 | l_ptr->fsm_msg_cnt++; |
616 | } | |
617 | link_set_timer(l_ptr, cont_intv); | |
618 | } else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) { | |
247f0f3c YX |
619 | tipc_link_proto_xmit(l_ptr, STATE_MSG, |
620 | 1, 0, 0, 0, 0); | |
b97bf3fd PL |
621 | l_ptr->fsm_msg_cnt++; |
622 | link_set_timer(l_ptr, cont_intv / 4); | |
623 | } else { /* Link has failed */ | |
3fa9cacd EH |
624 | pr_debug("%s<%s>, peer not responding\n", |
625 | link_rst_msg, l_ptr->name); | |
4323add6 | 626 | tipc_link_reset(l_ptr); |
b97bf3fd PL |
627 | l_ptr->state = RESET_UNKNOWN; |
628 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
629 | tipc_link_proto_xmit(l_ptr, RESET_MSG, |
630 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
631 | l_ptr->fsm_msg_cnt++; |
632 | link_set_timer(l_ptr, cont_intv); | |
633 | } | |
634 | break; | |
635 | default: | |
2cf8aa19 | 636 | pr_err("%s%u in WU state\n", link_unk_evt, event); |
b97bf3fd PL |
637 | } |
638 | break; | |
639 | case RESET_UNKNOWN: | |
b97bf3fd PL |
640 | switch (event) { |
641 | case TRAFFIC_MSG_EVT: | |
b97bf3fd PL |
642 | break; |
643 | case ACTIVATE_MSG: | |
644 | other = l_ptr->owner->active_links[0]; | |
8d64a5ba | 645 | if (other && link_working_unknown(other)) |
b97bf3fd | 646 | break; |
b97bf3fd PL |
647 | l_ptr->state = WORKING_WORKING; |
648 | l_ptr->fsm_msg_cnt = 0; | |
649 | link_activate(l_ptr); | |
247f0f3c | 650 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0); |
b97bf3fd | 651 | l_ptr->fsm_msg_cnt++; |
c64f7a6a | 652 | if (l_ptr->owner->working_links == 1) |
247f0f3c | 653 | tipc_link_sync_xmit(l_ptr); |
b97bf3fd PL |
654 | link_set_timer(l_ptr, cont_intv); |
655 | break; | |
656 | case RESET_MSG: | |
b97bf3fd PL |
657 | l_ptr->state = RESET_RESET; |
658 | l_ptr->fsm_msg_cnt = 0; | |
247f0f3c YX |
659 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
660 | 1, 0, 0, 0, 0); | |
b97bf3fd PL |
661 | l_ptr->fsm_msg_cnt++; |
662 | link_set_timer(l_ptr, cont_intv); | |
663 | break; | |
664 | case STARTING_EVT: | |
135daee6 | 665 | l_ptr->flags |= LINK_STARTED; |
af9946fd JPM |
666 | l_ptr->fsm_msg_cnt++; |
667 | link_set_timer(l_ptr, cont_intv); | |
668 | break; | |
b97bf3fd | 669 | case TIMEOUT_EVT: |
247f0f3c | 670 | tipc_link_proto_xmit(l_ptr, RESET_MSG, 0, 0, 0, 0, 0); |
b97bf3fd PL |
671 | l_ptr->fsm_msg_cnt++; |
672 | link_set_timer(l_ptr, cont_intv); | |
673 | break; | |
674 | default: | |
2cf8aa19 | 675 | pr_err("%s%u in RU state\n", link_unk_evt, event); |
b97bf3fd PL |
676 | } |
677 | break; | |
678 | case RESET_RESET: | |
b97bf3fd PL |
679 | switch (event) { |
680 | case TRAFFIC_MSG_EVT: | |
b97bf3fd PL |
681 | case ACTIVATE_MSG: |
682 | other = l_ptr->owner->active_links[0]; | |
8d64a5ba | 683 | if (other && link_working_unknown(other)) |
b97bf3fd | 684 | break; |
b97bf3fd PL |
685 | l_ptr->state = WORKING_WORKING; |
686 | l_ptr->fsm_msg_cnt = 0; | |
687 | link_activate(l_ptr); | |
247f0f3c | 688 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0); |
b97bf3fd | 689 | l_ptr->fsm_msg_cnt++; |
c64f7a6a | 690 | if (l_ptr->owner->working_links == 1) |
247f0f3c | 691 | tipc_link_sync_xmit(l_ptr); |
b97bf3fd PL |
692 | link_set_timer(l_ptr, cont_intv); |
693 | break; | |
694 | case RESET_MSG: | |
b97bf3fd PL |
695 | break; |
696 | case TIMEOUT_EVT: | |
247f0f3c YX |
697 | tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG, |
698 | 0, 0, 0, 0, 0); | |
b97bf3fd PL |
699 | l_ptr->fsm_msg_cnt++; |
700 | link_set_timer(l_ptr, cont_intv); | |
b97bf3fd PL |
701 | break; |
702 | default: | |
2cf8aa19 | 703 | pr_err("%s%u in RR state\n", link_unk_evt, event); |
b97bf3fd PL |
704 | } |
705 | break; | |
706 | default: | |
2cf8aa19 | 707 | pr_err("Unknown link state %u/%u\n", l_ptr->state, event); |
b97bf3fd PL |
708 | } |
709 | } | |
710 | ||
4f1688b2 JPM |
711 | /* tipc_link_cong: determine return value and how to treat the |
712 | * sent buffer during link congestion. | |
713 | * - For plain, errorless user data messages we keep the buffer and | |
714 | * return -ELINKONG. | |
715 | * - For all other messages we discard the buffer and return -EHOSTUNREACH | |
716 | * - For TIPC internal messages we also reset the link | |
717 | */ | |
a6ca1094 | 718 | static int tipc_link_cong(struct tipc_link *link, struct sk_buff_head *list) |
4f1688b2 | 719 | { |
a6ca1094 YX |
720 | struct sk_buff *skb = skb_peek(list); |
721 | struct tipc_msg *msg = buf_msg(skb); | |
e3eea1eb | 722 | int imp = msg_importance(msg); |
4f1688b2 JPM |
723 | u32 oport = msg_tot_origport(msg); |
724 | ||
50100a5e | 725 | if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) { |
4f1688b2 JPM |
726 | pr_warn("%s<%s>, send queue full", link_rst_msg, link->name); |
727 | tipc_link_reset(link); | |
50100a5e | 728 | goto drop; |
4f1688b2 | 729 | } |
50100a5e JPM |
730 | if (unlikely(msg_errcode(msg))) |
731 | goto drop; | |
732 | if (unlikely(msg_reroute_cnt(msg))) | |
733 | goto drop; | |
a6ca1094 | 734 | if (TIPC_SKB_CB(skb)->wakeup_pending) |
50100a5e | 735 | return -ELINKCONG; |
a6ca1094 | 736 | if (link_schedule_user(link, oport, skb_queue_len(list), imp)) |
50100a5e JPM |
737 | return -ELINKCONG; |
738 | drop: | |
a6ca1094 | 739 | __skb_queue_purge(list); |
4f1688b2 JPM |
740 | return -EHOSTUNREACH; |
741 | } | |
742 | ||
743 | /** | |
9fbfb8b1 | 744 | * __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked |
4f1688b2 | 745 | * @link: link to use |
a6ca1094 YX |
746 | * @list: chain of buffers containing message |
747 | * | |
4f1688b2 JPM |
748 | * Consumes the buffer chain, except when returning -ELINKCONG |
749 | * Returns 0 if success, otherwise errno: -ELINKCONG, -EMSGSIZE (plain socket | |
750 | * user data messages) or -EHOSTUNREACH (all other messages/senders) | |
751 | * Only the socket functions tipc_send_stream() and tipc_send_packet() need | |
752 | * to act on the return value, since they may need to do more send attempts. | |
753 | */ | |
7f9f95d9 YX |
754 | int __tipc_link_xmit(struct net *net, struct tipc_link *link, |
755 | struct sk_buff_head *list) | |
4f1688b2 | 756 | { |
a6ca1094 | 757 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
05dcc5aa | 758 | unsigned int maxwin = link->window; |
e3eea1eb | 759 | unsigned int imp = msg_importance(msg); |
4f1688b2 JPM |
760 | uint mtu = link->max_pkt; |
761 | uint ack = mod(link->next_in_no - 1); | |
762 | uint seqno = link->next_out_no; | |
763 | uint bc_last_in = link->owner->bclink.last_in; | |
764 | struct tipc_media_addr *addr = &link->media_addr; | |
05dcc5aa JPM |
765 | struct sk_buff_head *transmq = &link->transmq; |
766 | struct sk_buff_head *backlogq = &link->backlogq; | |
a6ca1094 | 767 | struct sk_buff *skb, *tmp; |
4f1688b2 | 768 | |
1f66d161 JPM |
769 | /* Match backlog limit against msg importance: */ |
770 | if (unlikely(link->backlog[imp].len >= link->backlog[imp].limit)) | |
a6ca1094 | 771 | return tipc_link_cong(link, list); |
4f1688b2 | 772 | |
05dcc5aa | 773 | if (unlikely(msg_size(msg) > mtu)) { |
a6ca1094 | 774 | __skb_queue_purge(list); |
4f1688b2 JPM |
775 | return -EMSGSIZE; |
776 | } | |
05dcc5aa | 777 | /* Prepare each packet for sending, and add to relevant queue: */ |
a6ca1094 YX |
778 | skb_queue_walk_safe(list, skb, tmp) { |
779 | __skb_unlink(skb, list); | |
58dc55f2 | 780 | msg = buf_msg(skb); |
05dcc5aa JPM |
781 | msg_set_seqno(msg, seqno); |
782 | msg_set_ack(msg, ack); | |
4f1688b2 JPM |
783 | msg_set_bcast_ack(msg, bc_last_in); |
784 | ||
05dcc5aa JPM |
785 | if (likely(skb_queue_len(transmq) < maxwin)) { |
786 | __skb_queue_tail(transmq, skb); | |
787 | tipc_bearer_send(net, link->bearer_id, skb, addr); | |
788 | link->rcv_unacked = 0; | |
789 | seqno++; | |
790 | continue; | |
791 | } | |
792 | if (tipc_msg_bundle(skb_peek_tail(backlogq), skb, mtu)) { | |
4f1688b2 | 793 | link->stats.sent_bundled++; |
4f1688b2 | 794 | continue; |
05dcc5aa JPM |
795 | } |
796 | if (tipc_msg_make_bundle(&skb, mtu, link->addr)) { | |
4f1688b2 JPM |
797 | link->stats.sent_bundled++; |
798 | link->stats.sent_bundles++; | |
1f66d161 | 799 | imp = msg_importance(buf_msg(skb)); |
4f1688b2 | 800 | } |
05dcc5aa | 801 | __skb_queue_tail(backlogq, skb); |
1f66d161 | 802 | link->backlog[imp].len++; |
4f1688b2 | 803 | seqno++; |
4f1688b2 JPM |
804 | } |
805 | link->next_out_no = seqno; | |
4f1688b2 JPM |
806 | return 0; |
807 | } | |
808 | ||
a6ca1094 YX |
809 | static void skb2list(struct sk_buff *skb, struct sk_buff_head *list) |
810 | { | |
c637c103 | 811 | skb_queue_head_init(list); |
a6ca1094 YX |
812 | __skb_queue_tail(list, skb); |
813 | } | |
814 | ||
815 | static int __tipc_link_xmit_skb(struct tipc_link *link, struct sk_buff *skb) | |
816 | { | |
817 | struct sk_buff_head head; | |
818 | ||
819 | skb2list(skb, &head); | |
7f9f95d9 | 820 | return __tipc_link_xmit(link->owner->net, link, &head); |
a6ca1094 YX |
821 | } |
822 | ||
f2f9800d YX |
823 | int tipc_link_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode, |
824 | u32 selector) | |
a6ca1094 YX |
825 | { |
826 | struct sk_buff_head head; | |
827 | ||
828 | skb2list(skb, &head); | |
f2f9800d | 829 | return tipc_link_xmit(net, &head, dnode, selector); |
a6ca1094 YX |
830 | } |
831 | ||
4f1688b2 | 832 | /** |
9fbfb8b1 | 833 | * tipc_link_xmit() is the general link level function for message sending |
f2f9800d | 834 | * @net: the applicable net namespace |
a6ca1094 | 835 | * @list: chain of buffers containing message |
4f1688b2 JPM |
836 | * @dsz: amount of user data to be sent |
837 | * @dnode: address of destination node | |
838 | * @selector: a number used for deterministic link selection | |
839 | * Consumes the buffer chain, except when returning -ELINKCONG | |
840 | * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE | |
841 | */ | |
f2f9800d YX |
842 | int tipc_link_xmit(struct net *net, struct sk_buff_head *list, u32 dnode, |
843 | u32 selector) | |
4f1688b2 JPM |
844 | { |
845 | struct tipc_link *link = NULL; | |
846 | struct tipc_node *node; | |
847 | int rc = -EHOSTUNREACH; | |
848 | ||
f2f9800d | 849 | node = tipc_node_find(net, dnode); |
4f1688b2 JPM |
850 | if (node) { |
851 | tipc_node_lock(node); | |
852 | link = node->active_links[selector & 1]; | |
853 | if (link) | |
7f9f95d9 | 854 | rc = __tipc_link_xmit(net, link, list); |
4f1688b2 JPM |
855 | tipc_node_unlock(node); |
856 | } | |
4f1688b2 JPM |
857 | if (link) |
858 | return rc; | |
859 | ||
3bd88ee7 EH |
860 | if (likely(in_own_node(net, dnode))) { |
861 | tipc_sk_rcv(net, list); | |
862 | return 0; | |
863 | } | |
4f1688b2 | 864 | |
c637c103 | 865 | __skb_queue_purge(list); |
4f1688b2 JPM |
866 | return rc; |
867 | } | |
868 | ||
c64f7a6a | 869 | /* |
247f0f3c | 870 | * tipc_link_sync_xmit - synchronize broadcast link endpoints. |
c64f7a6a JM |
871 | * |
872 | * Give a newly added peer node the sequence number where it should | |
873 | * start receiving and acking broadcast packets. | |
874 | * | |
875 | * Called with node locked | |
876 | */ | |
25b660c7 | 877 | static void tipc_link_sync_xmit(struct tipc_link *link) |
c64f7a6a | 878 | { |
a6ca1094 | 879 | struct sk_buff *skb; |
c64f7a6a JM |
880 | struct tipc_msg *msg; |
881 | ||
a6ca1094 YX |
882 | skb = tipc_buf_acquire(INT_H_SIZE); |
883 | if (!skb) | |
c64f7a6a JM |
884 | return; |
885 | ||
a6ca1094 | 886 | msg = buf_msg(skb); |
c5898636 | 887 | tipc_msg_init(link_own_addr(link), msg, BCAST_PROTOCOL, STATE_MSG, |
34747539 | 888 | INT_H_SIZE, link->addr); |
25b660c7 | 889 | msg_set_last_bcast(msg, link->owner->bclink.acked); |
a6ca1094 | 890 | __tipc_link_xmit_skb(link, skb); |
c64f7a6a JM |
891 | } |
892 | ||
893 | /* | |
247f0f3c | 894 | * tipc_link_sync_rcv - synchronize broadcast link endpoints. |
c64f7a6a JM |
895 | * Receive the sequence number where we should start receiving and |
896 | * acking broadcast packets from a newly added peer node, and open | |
897 | * up for reception of such packets. | |
898 | * | |
899 | * Called with node locked | |
900 | */ | |
247f0f3c | 901 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf) |
c64f7a6a JM |
902 | { |
903 | struct tipc_msg *msg = buf_msg(buf); | |
904 | ||
905 | n->bclink.last_sent = n->bclink.last_in = msg_last_bcast(msg); | |
906 | n->bclink.recv_permitted = true; | |
907 | kfree_skb(buf); | |
908 | } | |
909 | ||
c4307285 | 910 | /* |
47b4c9a8 YX |
911 | * tipc_link_push_packets - push unsent packets to bearer |
912 | * | |
913 | * Push out the unsent messages of a link where congestion | |
914 | * has abated. Node is locked. | |
915 | * | |
916 | * Called with node locked | |
b97bf3fd | 917 | */ |
05dcc5aa | 918 | void tipc_link_push_packets(struct tipc_link *link) |
b97bf3fd | 919 | { |
05dcc5aa | 920 | struct sk_buff *skb; |
47b4c9a8 | 921 | struct tipc_msg *msg; |
05dcc5aa | 922 | unsigned int ack = mod(link->next_in_no - 1); |
b97bf3fd | 923 | |
05dcc5aa JPM |
924 | while (skb_queue_len(&link->transmq) < link->window) { |
925 | skb = __skb_dequeue(&link->backlogq); | |
926 | if (!skb) | |
47b4c9a8 | 927 | break; |
05dcc5aa | 928 | msg = buf_msg(skb); |
1f66d161 | 929 | link->backlog[msg_importance(msg)].len--; |
05dcc5aa JPM |
930 | msg_set_ack(msg, ack); |
931 | msg_set_bcast_ack(msg, link->owner->bclink.last_in); | |
932 | link->rcv_unacked = 0; | |
933 | __skb_queue_tail(&link->transmq, skb); | |
934 | tipc_bearer_send(link->owner->net, link->bearer_id, | |
935 | skb, &link->media_addr); | |
b97bf3fd | 936 | } |
b97bf3fd PL |
937 | } |
938 | ||
3f5a12bd | 939 | void tipc_link_reset_all(struct tipc_node *node) |
d356eeba | 940 | { |
d356eeba AS |
941 | char addr_string[16]; |
942 | u32 i; | |
943 | ||
3f5a12bd | 944 | tipc_node_lock(node); |
d356eeba | 945 | |
2cf8aa19 | 946 | pr_warn("Resetting all links to %s\n", |
3f5a12bd | 947 | tipc_addr_string_fill(addr_string, node->addr)); |
d356eeba AS |
948 | |
949 | for (i = 0; i < MAX_BEARERS; i++) { | |
3f5a12bd YX |
950 | if (node->links[i]) { |
951 | link_print(node->links[i], "Resetting link\n"); | |
952 | tipc_link_reset(node->links[i]); | |
d356eeba AS |
953 | } |
954 | } | |
955 | ||
3f5a12bd | 956 | tipc_node_unlock(node); |
d356eeba AS |
957 | } |
958 | ||
a18c4bc3 | 959 | static void link_retransmit_failure(struct tipc_link *l_ptr, |
ae8509c4 | 960 | struct sk_buff *buf) |
d356eeba AS |
961 | { |
962 | struct tipc_msg *msg = buf_msg(buf); | |
1da46568 | 963 | struct net *net = l_ptr->owner->net; |
d356eeba | 964 | |
2cf8aa19 | 965 | pr_warn("Retransmission failure on link <%s>\n", l_ptr->name); |
d356eeba AS |
966 | |
967 | if (l_ptr->addr) { | |
d356eeba | 968 | /* Handle failure on standard link */ |
8d64a5ba | 969 | link_print(l_ptr, "Resetting link\n"); |
d356eeba AS |
970 | tipc_link_reset(l_ptr); |
971 | ||
972 | } else { | |
d356eeba | 973 | /* Handle failure on broadcast link */ |
6c00055a | 974 | struct tipc_node *n_ptr; |
d356eeba AS |
975 | char addr_string[16]; |
976 | ||
2cf8aa19 EH |
977 | pr_info("Msg seq number: %u, ", msg_seqno(msg)); |
978 | pr_cont("Outstanding acks: %lu\n", | |
979 | (unsigned long) TIPC_SKB_CB(buf)->handle); | |
617dbeaa | 980 | |
1da46568 | 981 | n_ptr = tipc_bclink_retransmit_to(net); |
d356eeba AS |
982 | tipc_node_lock(n_ptr); |
983 | ||
c68ca7b7 | 984 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
2cf8aa19 | 985 | pr_info("Broadcast link info for %s\n", addr_string); |
389dd9bc YX |
986 | pr_info("Reception permitted: %d, Acked: %u\n", |
987 | n_ptr->bclink.recv_permitted, | |
2cf8aa19 EH |
988 | n_ptr->bclink.acked); |
989 | pr_info("Last in: %u, Oos state: %u, Last sent: %u\n", | |
990 | n_ptr->bclink.last_in, | |
991 | n_ptr->bclink.oos_state, | |
992 | n_ptr->bclink.last_sent); | |
d356eeba | 993 | |
d356eeba AS |
994 | tipc_node_unlock(n_ptr); |
995 | ||
1da46568 | 996 | tipc_bclink_set_flags(net, TIPC_BCLINK_RESET); |
d356eeba AS |
997 | l_ptr->stale_count = 0; |
998 | } | |
999 | } | |
1000 | ||
58dc55f2 | 1001 | void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb, |
4323add6 | 1002 | u32 retransmits) |
b97bf3fd PL |
1003 | { |
1004 | struct tipc_msg *msg; | |
1005 | ||
58dc55f2 | 1006 | if (!skb) |
d356eeba AS |
1007 | return; |
1008 | ||
58dc55f2 | 1009 | msg = buf_msg(skb); |
c4307285 | 1010 | |
512137ee EH |
1011 | /* Detect repeated retransmit failures */ |
1012 | if (l_ptr->last_retransmitted == msg_seqno(msg)) { | |
1013 | if (++l_ptr->stale_count > 100) { | |
58dc55f2 | 1014 | link_retransmit_failure(l_ptr, skb); |
512137ee | 1015 | return; |
d356eeba AS |
1016 | } |
1017 | } else { | |
512137ee EH |
1018 | l_ptr->last_retransmitted = msg_seqno(msg); |
1019 | l_ptr->stale_count = 1; | |
b97bf3fd | 1020 | } |
d356eeba | 1021 | |
05dcc5aa JPM |
1022 | skb_queue_walk_from(&l_ptr->transmq, skb) { |
1023 | if (!retransmits) | |
58dc55f2 YX |
1024 | break; |
1025 | msg = buf_msg(skb); | |
b97bf3fd | 1026 | msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); |
c4307285 | 1027 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
7f9f95d9 YX |
1028 | tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, skb, |
1029 | &l_ptr->media_addr); | |
3c294cb3 YX |
1030 | retransmits--; |
1031 | l_ptr->stats.retransmitted++; | |
b97bf3fd | 1032 | } |
b97bf3fd PL |
1033 | } |
1034 | ||
f03273f1 YX |
1035 | static void link_retrieve_defq(struct tipc_link *link, |
1036 | struct sk_buff_head *list) | |
b97bf3fd PL |
1037 | { |
1038 | u32 seq_no; | |
1039 | ||
05dcc5aa | 1040 | if (skb_queue_empty(&link->deferdq)) |
f03273f1 YX |
1041 | return; |
1042 | ||
05dcc5aa | 1043 | seq_no = buf_seqno(skb_peek(&link->deferdq)); |
f03273f1 | 1044 | if (seq_no == mod(link->next_in_no)) |
05dcc5aa | 1045 | skb_queue_splice_tail_init(&link->deferdq, list); |
b97bf3fd PL |
1046 | } |
1047 | ||
b02b69c8 | 1048 | /** |
170b3927 | 1049 | * tipc_rcv - process TIPC packets/messages arriving from off-node |
f2f9800d | 1050 | * @net: the applicable net namespace |
f03273f1 | 1051 | * @skb: TIPC packet |
7a2f7d18 | 1052 | * @b_ptr: pointer to bearer message arrived on |
b02b69c8 AS |
1053 | * |
1054 | * Invoked with no locks held. Bearer pointer must point to a valid bearer | |
1055 | * structure (i.e. cannot be NULL), but bearer can be inactive. | |
1056 | */ | |
c93d3baa | 1057 | void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr) |
b97bf3fd | 1058 | { |
34747539 | 1059 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
f03273f1 YX |
1060 | struct sk_buff_head head; |
1061 | struct tipc_node *n_ptr; | |
1062 | struct tipc_link *l_ptr; | |
1063 | struct sk_buff *skb1, *tmp; | |
1064 | struct tipc_msg *msg; | |
1065 | u32 seq_no; | |
1066 | u32 ackd; | |
1067 | u32 released; | |
b97bf3fd | 1068 | |
a6ca1094 | 1069 | skb2list(skb, &head); |
85035568 | 1070 | |
f03273f1 | 1071 | while ((skb = __skb_dequeue(&head))) { |
85035568 | 1072 | /* Ensure message is well-formed */ |
cf2157f8 | 1073 | if (unlikely(!tipc_msg_validate(skb))) |
3af390e2 | 1074 | goto discard; |
b97bf3fd | 1075 | |
85035568 | 1076 | /* Handle arrival of a non-unicast link message */ |
f03273f1 | 1077 | msg = buf_msg(skb); |
b97bf3fd | 1078 | if (unlikely(msg_non_seq(msg))) { |
1265a021 | 1079 | if (msg_user(msg) == LINK_CONFIG) |
c93d3baa | 1080 | tipc_disc_rcv(net, skb, b_ptr); |
1265a021 | 1081 | else |
c93d3baa | 1082 | tipc_bclink_rcv(net, skb); |
b97bf3fd PL |
1083 | continue; |
1084 | } | |
c4307285 | 1085 | |
ed33a9c4 | 1086 | /* Discard unicast link messages destined for another node */ |
26008247 | 1087 | if (unlikely(!msg_short(msg) && |
34747539 | 1088 | (msg_destnode(msg) != tn->own_addr))) |
3af390e2 | 1089 | goto discard; |
c4307285 | 1090 | |
5a68d5ee | 1091 | /* Locate neighboring node that sent message */ |
f2f9800d | 1092 | n_ptr = tipc_node_find(net, msg_prevnode(msg)); |
b97bf3fd | 1093 | if (unlikely(!n_ptr)) |
3af390e2 | 1094 | goto discard; |
4323add6 | 1095 | tipc_node_lock(n_ptr); |
85035568 | 1096 | |
b4b56102 | 1097 | /* Locate unicast link endpoint that should handle message */ |
b4b56102 | 1098 | l_ptr = n_ptr->links[b_ptr->identity]; |
3af390e2 | 1099 | if (unlikely(!l_ptr)) |
c637c103 | 1100 | goto unlock; |
5a68d5ee | 1101 | |
b4b56102 | 1102 | /* Verify that communication with node is currently allowed */ |
aecb9bb8 | 1103 | if ((n_ptr->action_flags & TIPC_WAIT_PEER_LINKS_DOWN) && |
10f465c4 YX |
1104 | msg_user(msg) == LINK_PROTOCOL && |
1105 | (msg_type(msg) == RESET_MSG || | |
1106 | msg_type(msg) == ACTIVATE_MSG) && | |
1107 | !msg_redundant_link(msg)) | |
aecb9bb8 | 1108 | n_ptr->action_flags &= ~TIPC_WAIT_PEER_LINKS_DOWN; |
10f465c4 YX |
1109 | |
1110 | if (tipc_node_blocked(n_ptr)) | |
c637c103 | 1111 | goto unlock; |
85035568 AS |
1112 | |
1113 | /* Validate message sequence number info */ | |
85035568 AS |
1114 | seq_no = msg_seqno(msg); |
1115 | ackd = msg_ack(msg); | |
1116 | ||
1117 | /* Release acked messages */ | |
2cdf3918 | 1118 | if (unlikely(n_ptr->bclink.acked != msg_bcast_ack(msg))) |
36559591 | 1119 | tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg)); |
b97bf3fd | 1120 | |
58dc55f2 | 1121 | released = 0; |
05dcc5aa JPM |
1122 | skb_queue_walk_safe(&l_ptr->transmq, skb1, tmp) { |
1123 | if (more(buf_seqno(skb1), ackd)) | |
58dc55f2 | 1124 | break; |
05dcc5aa | 1125 | __skb_unlink(skb1, &l_ptr->transmq); |
58dc55f2 YX |
1126 | kfree_skb(skb1); |
1127 | released = 1; | |
b97bf3fd | 1128 | } |
85035568 AS |
1129 | |
1130 | /* Try sending any messages link endpoint has pending */ | |
05dcc5aa | 1131 | if (unlikely(skb_queue_len(&l_ptr->backlogq))) |
47b4c9a8 | 1132 | tipc_link_push_packets(l_ptr); |
a5377831 | 1133 | |
c637c103 | 1134 | if (released && !skb_queue_empty(&l_ptr->wakeupq)) |
50100a5e | 1135 | link_prepare_wakeup(l_ptr); |
a5377831 | 1136 | |
a5377831 | 1137 | /* Process the incoming packet */ |
3af390e2 YX |
1138 | if (unlikely(!link_working_working(l_ptr))) { |
1139 | if (msg_user(msg) == LINK_PROTOCOL) { | |
c5898636 | 1140 | tipc_link_proto_rcv(l_ptr, skb); |
f03273f1 | 1141 | link_retrieve_defq(l_ptr, &head); |
c637c103 JPM |
1142 | skb = NULL; |
1143 | goto unlock; | |
b97bf3fd | 1144 | } |
3af390e2 YX |
1145 | |
1146 | /* Traffic message. Conditionally activate link */ | |
1147 | link_state_event(l_ptr, TRAFFIC_MSG_EVT); | |
1148 | ||
1149 | if (link_working_working(l_ptr)) { | |
1150 | /* Re-insert buffer in front of queue */ | |
f03273f1 | 1151 | __skb_queue_head(&head, skb); |
c637c103 JPM |
1152 | skb = NULL; |
1153 | goto unlock; | |
3af390e2 | 1154 | } |
c637c103 | 1155 | goto unlock; |
3af390e2 YX |
1156 | } |
1157 | ||
1158 | /* Link is now in state WORKING_WORKING */ | |
1159 | if (unlikely(seq_no != mod(l_ptr->next_in_no))) { | |
c5898636 | 1160 | link_handle_out_of_seq_msg(l_ptr, skb); |
f03273f1 | 1161 | link_retrieve_defq(l_ptr, &head); |
c637c103 JPM |
1162 | skb = NULL; |
1163 | goto unlock; | |
b97bf3fd | 1164 | } |
3af390e2 | 1165 | l_ptr->next_in_no++; |
05dcc5aa | 1166 | if (unlikely(!skb_queue_empty(&l_ptr->deferdq))) |
f03273f1 | 1167 | link_retrieve_defq(l_ptr, &head); |
05dcc5aa | 1168 | if (unlikely(++l_ptr->rcv_unacked >= TIPC_MIN_LINK_WIN)) { |
3f53bd8f EH |
1169 | l_ptr->stats.sent_acks++; |
1170 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0); | |
1171 | } | |
c637c103 JPM |
1172 | tipc_link_input(l_ptr, skb); |
1173 | skb = NULL; | |
1174 | unlock: | |
3af390e2 YX |
1175 | tipc_node_unlock(n_ptr); |
1176 | discard: | |
c637c103 JPM |
1177 | if (unlikely(skb)) |
1178 | kfree_skb(skb); | |
b97bf3fd | 1179 | } |
b97bf3fd PL |
1180 | } |
1181 | ||
c637c103 | 1182 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 1183 | * |
c637c103 | 1184 | * Consumes buffer if message is of right type |
7ae934be EH |
1185 | * Node lock must be held |
1186 | */ | |
c637c103 | 1187 | static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb) |
7ae934be | 1188 | { |
c637c103 JPM |
1189 | struct tipc_node *node = link->owner; |
1190 | struct tipc_msg *msg = buf_msg(skb); | |
1191 | u32 dport = msg_destport(msg); | |
7ae934be | 1192 | |
7ae934be | 1193 | switch (msg_user(msg)) { |
c637c103 JPM |
1194 | case TIPC_LOW_IMPORTANCE: |
1195 | case TIPC_MEDIUM_IMPORTANCE: | |
1196 | case TIPC_HIGH_IMPORTANCE: | |
1197 | case TIPC_CRITICAL_IMPORTANCE: | |
1198 | case CONN_MANAGER: | |
1199 | if (tipc_skb_queue_tail(&link->inputq, skb, dport)) { | |
1200 | node->inputq = &link->inputq; | |
1201 | node->action_flags |= TIPC_MSG_EVT; | |
7ae934be | 1202 | } |
c637c103 | 1203 | return true; |
7ae934be | 1204 | case NAME_DISTRIBUTOR: |
c637c103 JPM |
1205 | node->bclink.recv_permitted = true; |
1206 | node->namedq = &link->namedq; | |
1207 | skb_queue_tail(&link->namedq, skb); | |
1208 | if (skb_queue_len(&link->namedq) == 1) | |
1209 | node->action_flags |= TIPC_NAMED_MSG_EVT; | |
1210 | return true; | |
1211 | case MSG_BUNDLER: | |
1212 | case CHANGEOVER_PROTOCOL: | |
1213 | case MSG_FRAGMENTER: | |
7ae934be | 1214 | case BCAST_PROTOCOL: |
c637c103 | 1215 | return false; |
7ae934be | 1216 | default: |
c637c103 JPM |
1217 | pr_warn("Dropping received illegal msg type\n"); |
1218 | kfree_skb(skb); | |
1219 | return false; | |
1220 | }; | |
7ae934be | 1221 | } |
c637c103 JPM |
1222 | |
1223 | /* tipc_link_input - process packet that has passed link protocol check | |
1224 | * | |
1225 | * Consumes buffer | |
1226 | * Node lock must be held | |
7ae934be | 1227 | */ |
c637c103 | 1228 | static void tipc_link_input(struct tipc_link *link, struct sk_buff *skb) |
7ae934be | 1229 | { |
c637c103 JPM |
1230 | struct tipc_node *node = link->owner; |
1231 | struct tipc_msg *msg = buf_msg(skb); | |
1232 | struct sk_buff *iskb; | |
1233 | int pos = 0; | |
1234 | ||
1235 | if (likely(tipc_data_input(link, skb))) | |
1236 | return; | |
7ae934be EH |
1237 | |
1238 | switch (msg_user(msg)) { | |
c637c103 JPM |
1239 | case CHANGEOVER_PROTOCOL: |
1240 | if (!tipc_link_tunnel_rcv(node, &skb)) | |
1241 | break; | |
1242 | if (msg_user(buf_msg(skb)) != MSG_BUNDLER) { | |
1243 | tipc_data_input(link, skb); | |
1244 | break; | |
1245 | } | |
1246 | case MSG_BUNDLER: | |
1247 | link->stats.recv_bundles++; | |
1248 | link->stats.recv_bundled += msg_msgcnt(msg); | |
1249 | ||
1250 | while (tipc_msg_extract(skb, &iskb, &pos)) | |
1251 | tipc_data_input(link, iskb); | |
7ae934be | 1252 | break; |
c637c103 JPM |
1253 | case MSG_FRAGMENTER: |
1254 | link->stats.recv_fragments++; | |
1255 | if (tipc_buf_append(&link->reasm_buf, &skb)) { | |
1256 | link->stats.recv_fragmented++; | |
1257 | tipc_data_input(link, skb); | |
1258 | } else if (!link->reasm_buf) { | |
1259 | tipc_link_reset(link); | |
1260 | } | |
7ae934be | 1261 | break; |
c637c103 JPM |
1262 | case BCAST_PROTOCOL: |
1263 | tipc_link_sync_rcv(node, skb); | |
7ae934be EH |
1264 | break; |
1265 | default: | |
c637c103 JPM |
1266 | break; |
1267 | }; | |
7ae934be EH |
1268 | } |
1269 | ||
2c53040f | 1270 | /** |
8809b255 AS |
1271 | * tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue |
1272 | * | |
1273 | * Returns increase in queue length (i.e. 0 or 1) | |
b97bf3fd | 1274 | */ |
bc6fecd4 | 1275 | u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb) |
b97bf3fd | 1276 | { |
bc6fecd4 YX |
1277 | struct sk_buff *skb1; |
1278 | u32 seq_no = buf_seqno(skb); | |
b97bf3fd PL |
1279 | |
1280 | /* Empty queue ? */ | |
bc6fecd4 YX |
1281 | if (skb_queue_empty(list)) { |
1282 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1283 | return 1; |
1284 | } | |
1285 | ||
1286 | /* Last ? */ | |
bc6fecd4 YX |
1287 | if (less(buf_seqno(skb_peek_tail(list)), seq_no)) { |
1288 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1289 | return 1; |
1290 | } | |
1291 | ||
8809b255 | 1292 | /* Locate insertion point in queue, then insert; discard if duplicate */ |
bc6fecd4 YX |
1293 | skb_queue_walk(list, skb1) { |
1294 | u32 curr_seqno = buf_seqno(skb1); | |
b97bf3fd | 1295 | |
8809b255 | 1296 | if (seq_no == curr_seqno) { |
bc6fecd4 | 1297 | kfree_skb(skb); |
8809b255 | 1298 | return 0; |
b97bf3fd | 1299 | } |
8809b255 AS |
1300 | |
1301 | if (less(seq_no, curr_seqno)) | |
b97bf3fd | 1302 | break; |
8809b255 | 1303 | } |
b97bf3fd | 1304 | |
bc6fecd4 | 1305 | __skb_queue_before(list, skb1, skb); |
8809b255 | 1306 | return 1; |
b97bf3fd PL |
1307 | } |
1308 | ||
8809b255 | 1309 | /* |
b97bf3fd PL |
1310 | * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet |
1311 | */ | |
c5898636 | 1312 | static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr, |
b97bf3fd PL |
1313 | struct sk_buff *buf) |
1314 | { | |
f905730c | 1315 | u32 seq_no = buf_seqno(buf); |
b97bf3fd PL |
1316 | |
1317 | if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) { | |
c5898636 | 1318 | tipc_link_proto_rcv(l_ptr, buf); |
b97bf3fd PL |
1319 | return; |
1320 | } | |
1321 | ||
b97bf3fd | 1322 | /* Record OOS packet arrival (force mismatch on next timeout) */ |
b97bf3fd PL |
1323 | l_ptr->checkpoint--; |
1324 | ||
c4307285 | 1325 | /* |
b97bf3fd PL |
1326 | * Discard packet if a duplicate; otherwise add it to deferred queue |
1327 | * and notify peer of gap as per protocol specification | |
1328 | */ | |
b97bf3fd PL |
1329 | if (less(seq_no, mod(l_ptr->next_in_no))) { |
1330 | l_ptr->stats.duplicates++; | |
5f6d9123 | 1331 | kfree_skb(buf); |
b97bf3fd PL |
1332 | return; |
1333 | } | |
1334 | ||
05dcc5aa | 1335 | if (tipc_link_defer_pkt(&l_ptr->deferdq, buf)) { |
b97bf3fd | 1336 | l_ptr->stats.deferred_recv++; |
05dcc5aa | 1337 | if ((skb_queue_len(&l_ptr->deferdq) % TIPC_MIN_LINK_WIN) == 1) |
247f0f3c | 1338 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0); |
bc6fecd4 | 1339 | } else { |
b97bf3fd | 1340 | l_ptr->stats.duplicates++; |
bc6fecd4 | 1341 | } |
b97bf3fd PL |
1342 | } |
1343 | ||
1344 | /* | |
1345 | * Send protocol message to the other endpoint. | |
1346 | */ | |
247f0f3c YX |
1347 | void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg, |
1348 | u32 gap, u32 tolerance, u32 priority, u32 ack_mtu) | |
b97bf3fd | 1349 | { |
1fc54d8f | 1350 | struct sk_buff *buf = NULL; |
b97bf3fd | 1351 | struct tipc_msg *msg = l_ptr->pmsg; |
c4307285 | 1352 | u32 msg_size = sizeof(l_ptr->proto_msg); |
75f0aa49 | 1353 | int r_flag; |
b97bf3fd | 1354 | |
77a7e07a YX |
1355 | /* Don't send protocol message during link changeover */ |
1356 | if (l_ptr->exp_msg_count) | |
b97bf3fd | 1357 | return; |
b4b56102 AS |
1358 | |
1359 | /* Abort non-RESET send if communication with node is prohibited */ | |
10f465c4 | 1360 | if ((tipc_node_blocked(l_ptr->owner)) && (msg_typ != RESET_MSG)) |
b4b56102 AS |
1361 | return; |
1362 | ||
92d2c905 | 1363 | /* Create protocol message with "out-of-sequence" sequence number */ |
b97bf3fd | 1364 | msg_set_type(msg, msg_typ); |
7a2f7d18 | 1365 | msg_set_net_plane(msg, l_ptr->net_plane); |
7a54d4a9 | 1366 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
1da46568 | 1367 | msg_set_last_bcast(msg, tipc_bclink_get_last_sent(l_ptr->owner->net)); |
b97bf3fd PL |
1368 | |
1369 | if (msg_typ == STATE_MSG) { | |
1370 | u32 next_sent = mod(l_ptr->next_out_no); | |
1371 | ||
4323add6 | 1372 | if (!tipc_link_is_up(l_ptr)) |
b97bf3fd | 1373 | return; |
05dcc5aa JPM |
1374 | if (skb_queue_len(&l_ptr->backlogq)) |
1375 | next_sent = buf_seqno(skb_peek(&l_ptr->backlogq)); | |
b97bf3fd | 1376 | msg_set_next_sent(msg, next_sent); |
05dcc5aa JPM |
1377 | if (!skb_queue_empty(&l_ptr->deferdq)) { |
1378 | u32 rec = buf_seqno(skb_peek(&l_ptr->deferdq)); | |
b97bf3fd PL |
1379 | gap = mod(rec - mod(l_ptr->next_in_no)); |
1380 | } | |
1381 | msg_set_seq_gap(msg, gap); | |
1382 | if (gap) | |
1383 | l_ptr->stats.sent_nacks++; | |
1384 | msg_set_link_tolerance(msg, tolerance); | |
1385 | msg_set_linkprio(msg, priority); | |
1386 | msg_set_max_pkt(msg, ack_mtu); | |
1387 | msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); | |
1388 | msg_set_probe(msg, probe_msg != 0); | |
c4307285 | 1389 | if (probe_msg) { |
b97bf3fd PL |
1390 | u32 mtu = l_ptr->max_pkt; |
1391 | ||
c4307285 | 1392 | if ((mtu < l_ptr->max_pkt_target) && |
b97bf3fd PL |
1393 | link_working_working(l_ptr) && |
1394 | l_ptr->fsm_msg_cnt) { | |
1395 | msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3; | |
c4307285 YH |
1396 | if (l_ptr->max_pkt_probes == 10) { |
1397 | l_ptr->max_pkt_target = (msg_size - 4); | |
1398 | l_ptr->max_pkt_probes = 0; | |
b97bf3fd | 1399 | msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3; |
c4307285 | 1400 | } |
b97bf3fd | 1401 | l_ptr->max_pkt_probes++; |
c4307285 | 1402 | } |
b97bf3fd PL |
1403 | |
1404 | l_ptr->stats.sent_probes++; | |
c4307285 | 1405 | } |
b97bf3fd PL |
1406 | l_ptr->stats.sent_states++; |
1407 | } else { /* RESET_MSG or ACTIVATE_MSG */ | |
1408 | msg_set_ack(msg, mod(l_ptr->reset_checkpoint - 1)); | |
1409 | msg_set_seq_gap(msg, 0); | |
1410 | msg_set_next_sent(msg, 1); | |
f23d9bf2 | 1411 | msg_set_probe(msg, 0); |
b97bf3fd PL |
1412 | msg_set_link_tolerance(msg, l_ptr->tolerance); |
1413 | msg_set_linkprio(msg, l_ptr->priority); | |
1414 | msg_set_max_pkt(msg, l_ptr->max_pkt_target); | |
1415 | } | |
1416 | ||
75f0aa49 AS |
1417 | r_flag = (l_ptr->owner->working_links > tipc_link_is_up(l_ptr)); |
1418 | msg_set_redundant_link(msg, r_flag); | |
b97bf3fd | 1419 | msg_set_linkprio(msg, l_ptr->priority); |
92d2c905 | 1420 | msg_set_size(msg, msg_size); |
b97bf3fd PL |
1421 | |
1422 | msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2))); | |
1423 | ||
31e3c3f6 | 1424 | buf = tipc_buf_acquire(msg_size); |
b97bf3fd PL |
1425 | if (!buf) |
1426 | return; | |
1427 | ||
27d7ff46 | 1428 | skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg)); |
796c75d0 | 1429 | buf->priority = TC_PRIO_CONTROL; |
7f9f95d9 YX |
1430 | tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, buf, |
1431 | &l_ptr->media_addr); | |
05dcc5aa | 1432 | l_ptr->rcv_unacked = 0; |
5f6d9123 | 1433 | kfree_skb(buf); |
b97bf3fd PL |
1434 | } |
1435 | ||
1436 | /* | |
1437 | * Receive protocol message : | |
c4307285 YH |
1438 | * Note that network plane id propagates through the network, and may |
1439 | * change at any time. The node with lowest address rules | |
b97bf3fd | 1440 | */ |
c5898636 | 1441 | static void tipc_link_proto_rcv(struct tipc_link *l_ptr, |
c93d3baa | 1442 | struct sk_buff *buf) |
b97bf3fd PL |
1443 | { |
1444 | u32 rec_gap = 0; | |
1445 | u32 max_pkt_info; | |
c4307285 | 1446 | u32 max_pkt_ack; |
b97bf3fd PL |
1447 | u32 msg_tol; |
1448 | struct tipc_msg *msg = buf_msg(buf); | |
1449 | ||
77a7e07a YX |
1450 | /* Discard protocol message during link changeover */ |
1451 | if (l_ptr->exp_msg_count) | |
b97bf3fd PL |
1452 | goto exit; |
1453 | ||
7a2f7d18 | 1454 | if (l_ptr->net_plane != msg_net_plane(msg)) |
c5898636 | 1455 | if (link_own_addr(l_ptr) > msg_prevnode(msg)) |
7a2f7d18 | 1456 | l_ptr->net_plane = msg_net_plane(msg); |
b97bf3fd | 1457 | |
b97bf3fd | 1458 | switch (msg_type(msg)) { |
c4307285 | 1459 | |
b97bf3fd | 1460 | case RESET_MSG: |
a686e685 AS |
1461 | if (!link_working_unknown(l_ptr) && |
1462 | (l_ptr->peer_session != INVALID_SESSION)) { | |
641c218d AS |
1463 | if (less_eq(msg_session(msg), l_ptr->peer_session)) |
1464 | break; /* duplicate or old reset: ignore */ | |
b97bf3fd | 1465 | } |
b4b56102 AS |
1466 | |
1467 | if (!msg_redundant_link(msg) && (link_working_working(l_ptr) || | |
1468 | link_working_unknown(l_ptr))) { | |
1469 | /* | |
1470 | * peer has lost contact -- don't allow peer's links | |
1471 | * to reactivate before we recognize loss & clean up | |
1472 | */ | |
ca9cf06a | 1473 | l_ptr->owner->action_flags |= TIPC_WAIT_OWN_LINKS_DOWN; |
b4b56102 AS |
1474 | } |
1475 | ||
47361c87 AS |
1476 | link_state_event(l_ptr, RESET_MSG); |
1477 | ||
b97bf3fd PL |
1478 | /* fall thru' */ |
1479 | case ACTIVATE_MSG: | |
1480 | /* Update link settings according other endpoint's values */ | |
b97bf3fd PL |
1481 | strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg)); |
1482 | ||
2db9983a AS |
1483 | msg_tol = msg_link_tolerance(msg); |
1484 | if (msg_tol > l_ptr->tolerance) | |
b97bf3fd PL |
1485 | link_set_supervision_props(l_ptr, msg_tol); |
1486 | ||
1487 | if (msg_linkprio(msg) > l_ptr->priority) | |
1488 | l_ptr->priority = msg_linkprio(msg); | |
1489 | ||
1490 | max_pkt_info = msg_max_pkt(msg); | |
c4307285 | 1491 | if (max_pkt_info) { |
b97bf3fd PL |
1492 | if (max_pkt_info < l_ptr->max_pkt_target) |
1493 | l_ptr->max_pkt_target = max_pkt_info; | |
1494 | if (l_ptr->max_pkt > l_ptr->max_pkt_target) | |
1495 | l_ptr->max_pkt = l_ptr->max_pkt_target; | |
1496 | } else { | |
c4307285 | 1497 | l_ptr->max_pkt = l_ptr->max_pkt_target; |
b97bf3fd | 1498 | } |
b97bf3fd | 1499 | |
4d75313c | 1500 | /* Synchronize broadcast link info, if not done previously */ |
7a54d4a9 AS |
1501 | if (!tipc_node_is_up(l_ptr->owner)) { |
1502 | l_ptr->owner->bclink.last_sent = | |
1503 | l_ptr->owner->bclink.last_in = | |
1504 | msg_last_bcast(msg); | |
1505 | l_ptr->owner->bclink.oos_state = 0; | |
1506 | } | |
4d75313c | 1507 | |
b97bf3fd PL |
1508 | l_ptr->peer_session = msg_session(msg); |
1509 | l_ptr->peer_bearer_id = msg_bearer_id(msg); | |
47361c87 AS |
1510 | |
1511 | if (msg_type(msg) == ACTIVATE_MSG) | |
1512 | link_state_event(l_ptr, ACTIVATE_MSG); | |
b97bf3fd PL |
1513 | break; |
1514 | case STATE_MSG: | |
1515 | ||
2db9983a AS |
1516 | msg_tol = msg_link_tolerance(msg); |
1517 | if (msg_tol) | |
b97bf3fd | 1518 | link_set_supervision_props(l_ptr, msg_tol); |
c4307285 YH |
1519 | |
1520 | if (msg_linkprio(msg) && | |
b97bf3fd | 1521 | (msg_linkprio(msg) != l_ptr->priority)) { |
3fa9cacd EH |
1522 | pr_debug("%s<%s>, priority change %u->%u\n", |
1523 | link_rst_msg, l_ptr->name, | |
1524 | l_ptr->priority, msg_linkprio(msg)); | |
b97bf3fd | 1525 | l_ptr->priority = msg_linkprio(msg); |
4323add6 | 1526 | tipc_link_reset(l_ptr); /* Enforce change to take effect */ |
b97bf3fd PL |
1527 | break; |
1528 | } | |
ec37dcd3 JPM |
1529 | |
1530 | /* Record reception; force mismatch at next timeout: */ | |
1531 | l_ptr->checkpoint--; | |
1532 | ||
b97bf3fd PL |
1533 | link_state_event(l_ptr, TRAFFIC_MSG_EVT); |
1534 | l_ptr->stats.recv_states++; | |
1535 | if (link_reset_unknown(l_ptr)) | |
1536 | break; | |
1537 | ||
1538 | if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) { | |
c4307285 | 1539 | rec_gap = mod(msg_next_sent(msg) - |
b97bf3fd PL |
1540 | mod(l_ptr->next_in_no)); |
1541 | } | |
1542 | ||
1543 | max_pkt_ack = msg_max_pkt(msg); | |
c4307285 | 1544 | if (max_pkt_ack > l_ptr->max_pkt) { |
c4307285 YH |
1545 | l_ptr->max_pkt = max_pkt_ack; |
1546 | l_ptr->max_pkt_probes = 0; | |
1547 | } | |
b97bf3fd PL |
1548 | |
1549 | max_pkt_ack = 0; | |
c4307285 | 1550 | if (msg_probe(msg)) { |
b97bf3fd | 1551 | l_ptr->stats.recv_probes++; |
a016892c | 1552 | if (msg_size(msg) > sizeof(l_ptr->proto_msg)) |
c4307285 | 1553 | max_pkt_ack = msg_size(msg); |
c4307285 | 1554 | } |
b97bf3fd PL |
1555 | |
1556 | /* Protocol message before retransmits, reduce loss risk */ | |
389dd9bc | 1557 | if (l_ptr->owner->bclink.recv_permitted) |
c5898636 | 1558 | tipc_bclink_update_link_state(l_ptr->owner, |
7a54d4a9 | 1559 | msg_last_bcast(msg)); |
b97bf3fd PL |
1560 | |
1561 | if (rec_gap || (msg_probe(msg))) { | |
247f0f3c YX |
1562 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, rec_gap, 0, |
1563 | 0, max_pkt_ack); | |
b97bf3fd PL |
1564 | } |
1565 | if (msg_seq_gap(msg)) { | |
b97bf3fd | 1566 | l_ptr->stats.recv_nacks++; |
05dcc5aa | 1567 | tipc_link_retransmit(l_ptr, skb_peek(&l_ptr->transmq), |
4323add6 | 1568 | msg_seq_gap(msg)); |
b97bf3fd PL |
1569 | } |
1570 | break; | |
b97bf3fd PL |
1571 | } |
1572 | exit: | |
5f6d9123 | 1573 | kfree_skb(buf); |
b97bf3fd PL |
1574 | } |
1575 | ||
1576 | ||
170b3927 JPM |
1577 | /* tipc_link_tunnel_xmit(): Tunnel one packet via a link belonging to |
1578 | * a different bearer. Owner node is locked. | |
b97bf3fd | 1579 | */ |
170b3927 JPM |
1580 | static void tipc_link_tunnel_xmit(struct tipc_link *l_ptr, |
1581 | struct tipc_msg *tunnel_hdr, | |
1582 | struct tipc_msg *msg, | |
1583 | u32 selector) | |
b97bf3fd | 1584 | { |
a18c4bc3 | 1585 | struct tipc_link *tunnel; |
a6ca1094 | 1586 | struct sk_buff *skb; |
b97bf3fd PL |
1587 | u32 length = msg_size(msg); |
1588 | ||
1589 | tunnel = l_ptr->owner->active_links[selector & 1]; | |
5392d646 | 1590 | if (!tipc_link_is_up(tunnel)) { |
2cf8aa19 | 1591 | pr_warn("%stunnel link no longer available\n", link_co_err); |
b97bf3fd | 1592 | return; |
5392d646 | 1593 | } |
b97bf3fd | 1594 | msg_set_size(tunnel_hdr, length + INT_H_SIZE); |
a6ca1094 YX |
1595 | skb = tipc_buf_acquire(length + INT_H_SIZE); |
1596 | if (!skb) { | |
2cf8aa19 | 1597 | pr_warn("%sunable to send tunnel msg\n", link_co_err); |
b97bf3fd | 1598 | return; |
5392d646 | 1599 | } |
a6ca1094 YX |
1600 | skb_copy_to_linear_data(skb, tunnel_hdr, INT_H_SIZE); |
1601 | skb_copy_to_linear_data_offset(skb, INT_H_SIZE, msg, length); | |
1602 | __tipc_link_xmit_skb(tunnel, skb); | |
b97bf3fd PL |
1603 | } |
1604 | ||
1605 | ||
170b3927 JPM |
1606 | /* tipc_link_failover_send_queue(): A link has gone down, but a second |
1607 | * link is still active. We can do failover. Tunnel the failing link's | |
1608 | * whole send queue via the remaining link. This way, we don't lose | |
1609 | * any packets, and sequence order is preserved for subsequent traffic | |
1610 | * sent over the remaining link. Owner node is locked. | |
b97bf3fd | 1611 | */ |
170b3927 | 1612 | void tipc_link_failover_send_queue(struct tipc_link *l_ptr) |
b97bf3fd | 1613 | { |
05dcc5aa | 1614 | int msgcount; |
a18c4bc3 | 1615 | struct tipc_link *tunnel = l_ptr->owner->active_links[0]; |
b97bf3fd | 1616 | struct tipc_msg tunnel_hdr; |
58dc55f2 | 1617 | struct sk_buff *skb; |
5392d646 | 1618 | int split_bundles; |
b97bf3fd PL |
1619 | |
1620 | if (!tunnel) | |
1621 | return; | |
1622 | ||
c5898636 | 1623 | tipc_msg_init(link_own_addr(l_ptr), &tunnel_hdr, CHANGEOVER_PROTOCOL, |
34747539 | 1624 | ORIGINAL_MSG, INT_H_SIZE, l_ptr->addr); |
05dcc5aa | 1625 | skb_queue_splice_tail_init(&l_ptr->backlogq, &l_ptr->transmq); |
1f66d161 | 1626 | tipc_link_purge_backlog(l_ptr); |
05dcc5aa | 1627 | msgcount = skb_queue_len(&l_ptr->transmq); |
b97bf3fd PL |
1628 | msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id); |
1629 | msg_set_msgcnt(&tunnel_hdr, msgcount); | |
f131072c | 1630 | |
05dcc5aa | 1631 | if (skb_queue_empty(&l_ptr->transmq)) { |
58dc55f2 YX |
1632 | skb = tipc_buf_acquire(INT_H_SIZE); |
1633 | if (skb) { | |
1634 | skb_copy_to_linear_data(skb, &tunnel_hdr, INT_H_SIZE); | |
b97bf3fd | 1635 | msg_set_size(&tunnel_hdr, INT_H_SIZE); |
a6ca1094 | 1636 | __tipc_link_xmit_skb(tunnel, skb); |
b97bf3fd | 1637 | } else { |
2cf8aa19 EH |
1638 | pr_warn("%sunable to send changeover msg\n", |
1639 | link_co_err); | |
b97bf3fd PL |
1640 | } |
1641 | return; | |
1642 | } | |
f131072c | 1643 | |
c4307285 | 1644 | split_bundles = (l_ptr->owner->active_links[0] != |
5392d646 AS |
1645 | l_ptr->owner->active_links[1]); |
1646 | ||
05dcc5aa | 1647 | skb_queue_walk(&l_ptr->transmq, skb) { |
58dc55f2 | 1648 | struct tipc_msg *msg = buf_msg(skb); |
b97bf3fd PL |
1649 | |
1650 | if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) { | |
b97bf3fd | 1651 | struct tipc_msg *m = msg_get_wrapped(msg); |
0e65967e | 1652 | unchar *pos = (unchar *)m; |
b97bf3fd | 1653 | |
d788d805 | 1654 | msgcount = msg_msgcnt(msg); |
b97bf3fd | 1655 | while (msgcount--) { |
0e65967e | 1656 | msg_set_seqno(m, msg_seqno(msg)); |
170b3927 JPM |
1657 | tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, m, |
1658 | msg_link_selector(m)); | |
b97bf3fd PL |
1659 | pos += align(msg_size(m)); |
1660 | m = (struct tipc_msg *)pos; | |
1661 | } | |
1662 | } else { | |
170b3927 JPM |
1663 | tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, msg, |
1664 | msg_link_selector(msg)); | |
b97bf3fd | 1665 | } |
b97bf3fd PL |
1666 | } |
1667 | } | |
1668 | ||
247f0f3c | 1669 | /* tipc_link_dup_queue_xmit(): A second link has become active. Tunnel a |
170b3927 JPM |
1670 | * duplicate of the first link's send queue via the new link. This way, we |
1671 | * are guaranteed that currently queued packets from a socket are delivered | |
1672 | * before future traffic from the same socket, even if this is using the | |
1673 | * new link. The last arriving copy of each duplicate packet is dropped at | |
1674 | * the receiving end by the regular protocol check, so packet cardinality | |
1675 | * and sequence order is preserved per sender/receiver socket pair. | |
1676 | * Owner node is locked. | |
1677 | */ | |
05dcc5aa JPM |
1678 | void tipc_link_dup_queue_xmit(struct tipc_link *link, |
1679 | struct tipc_link *tnl) | |
b97bf3fd | 1680 | { |
58dc55f2 | 1681 | struct sk_buff *skb; |
05dcc5aa JPM |
1682 | struct tipc_msg tnl_hdr; |
1683 | struct sk_buff_head *queue = &link->transmq; | |
1684 | int mcnt; | |
1685 | ||
1686 | tipc_msg_init(link_own_addr(link), &tnl_hdr, CHANGEOVER_PROTOCOL, | |
1687 | DUPLICATE_MSG, INT_H_SIZE, link->addr); | |
1688 | mcnt = skb_queue_len(&link->transmq) + skb_queue_len(&link->backlogq); | |
1689 | msg_set_msgcnt(&tnl_hdr, mcnt); | |
1690 | msg_set_bearer_id(&tnl_hdr, link->peer_bearer_id); | |
1691 | ||
1692 | tunnel_queue: | |
1693 | skb_queue_walk(queue, skb) { | |
58dc55f2 YX |
1694 | struct sk_buff *outskb; |
1695 | struct tipc_msg *msg = buf_msg(skb); | |
05dcc5aa | 1696 | u32 len = msg_size(msg); |
b97bf3fd | 1697 | |
05dcc5aa JPM |
1698 | msg_set_ack(msg, mod(link->next_in_no - 1)); |
1699 | msg_set_bcast_ack(msg, link->owner->bclink.last_in); | |
1700 | msg_set_size(&tnl_hdr, len + INT_H_SIZE); | |
1701 | outskb = tipc_buf_acquire(len + INT_H_SIZE); | |
58dc55f2 | 1702 | if (outskb == NULL) { |
2cf8aa19 EH |
1703 | pr_warn("%sunable to send duplicate msg\n", |
1704 | link_co_err); | |
b97bf3fd PL |
1705 | return; |
1706 | } | |
05dcc5aa JPM |
1707 | skb_copy_to_linear_data(outskb, &tnl_hdr, INT_H_SIZE); |
1708 | skb_copy_to_linear_data_offset(outskb, INT_H_SIZE, | |
1709 | skb->data, len); | |
1710 | __tipc_link_xmit_skb(tnl, outskb); | |
1711 | if (!tipc_link_is_up(link)) | |
b97bf3fd | 1712 | return; |
b97bf3fd | 1713 | } |
05dcc5aa JPM |
1714 | if (queue == &link->backlogq) |
1715 | return; | |
1716 | queue = &link->backlogq; | |
1717 | goto tunnel_queue; | |
b97bf3fd PL |
1718 | } |
1719 | ||
1dab3d5a JPM |
1720 | /* tipc_link_dup_rcv(): Receive a tunnelled DUPLICATE_MSG packet. |
1721 | * Owner node is locked. | |
1722 | */ | |
c1336ee4 JPM |
1723 | static void tipc_link_dup_rcv(struct tipc_link *link, |
1724 | struct sk_buff *skb) | |
1dab3d5a | 1725 | { |
c1336ee4 JPM |
1726 | struct sk_buff *iskb; |
1727 | int pos = 0; | |
1dab3d5a | 1728 | |
c1336ee4 | 1729 | if (!tipc_link_is_up(link)) |
1dab3d5a JPM |
1730 | return; |
1731 | ||
c1336ee4 | 1732 | if (!tipc_msg_extract(skb, &iskb, &pos)) { |
1dab3d5a JPM |
1733 | pr_warn("%sfailed to extract inner dup pkt\n", link_co_err); |
1734 | return; | |
1735 | } | |
c1336ee4 JPM |
1736 | /* Append buffer to deferred queue, if applicable: */ |
1737 | link_handle_out_of_seq_msg(link, iskb); | |
1dab3d5a JPM |
1738 | } |
1739 | ||
f006c9c7 JPM |
1740 | /* tipc_link_failover_rcv(): Receive a tunnelled ORIGINAL_MSG packet |
1741 | * Owner node is locked. | |
1742 | */ | |
1743 | static struct sk_buff *tipc_link_failover_rcv(struct tipc_link *l_ptr, | |
1744 | struct sk_buff *t_buf) | |
1745 | { | |
1746 | struct tipc_msg *t_msg = buf_msg(t_buf); | |
1747 | struct sk_buff *buf = NULL; | |
1748 | struct tipc_msg *msg; | |
c1336ee4 | 1749 | int pos = 0; |
f006c9c7 JPM |
1750 | |
1751 | if (tipc_link_is_up(l_ptr)) | |
1752 | tipc_link_reset(l_ptr); | |
1753 | ||
1754 | /* First failover packet? */ | |
1755 | if (l_ptr->exp_msg_count == START_CHANGEOVER) | |
1756 | l_ptr->exp_msg_count = msg_msgcnt(t_msg); | |
1757 | ||
1758 | /* Should there be an inner packet? */ | |
1759 | if (l_ptr->exp_msg_count) { | |
1760 | l_ptr->exp_msg_count--; | |
c1336ee4 | 1761 | if (!tipc_msg_extract(t_buf, &buf, &pos)) { |
f006c9c7 JPM |
1762 | pr_warn("%sno inner failover pkt\n", link_co_err); |
1763 | goto exit; | |
1764 | } | |
1765 | msg = buf_msg(buf); | |
1766 | ||
1767 | if (less(msg_seqno(msg), l_ptr->reset_checkpoint)) { | |
1768 | kfree_skb(buf); | |
1769 | buf = NULL; | |
1770 | goto exit; | |
1771 | } | |
1772 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
1773 | l_ptr->stats.recv_fragments++; | |
37e22164 | 1774 | tipc_buf_append(&l_ptr->reasm_buf, &buf); |
f006c9c7 JPM |
1775 | } |
1776 | } | |
f006c9c7 | 1777 | exit: |
2d72d495 JPM |
1778 | if ((!l_ptr->exp_msg_count) && (l_ptr->flags & LINK_STOPPED)) |
1779 | tipc_link_delete(l_ptr); | |
f006c9c7 JPM |
1780 | return buf; |
1781 | } | |
1782 | ||
1dab3d5a | 1783 | /* tipc_link_tunnel_rcv(): Receive a tunnelled packet, sent |
170b3927 JPM |
1784 | * via other link as result of a failover (ORIGINAL_MSG) or |
1785 | * a new active link (DUPLICATE_MSG). Failover packets are | |
1786 | * returned to the active link for delivery upwards. | |
1787 | * Owner node is locked. | |
b97bf3fd | 1788 | */ |
c5898636 | 1789 | static int tipc_link_tunnel_rcv(struct tipc_node *n_ptr, |
170b3927 | 1790 | struct sk_buff **buf) |
b97bf3fd | 1791 | { |
02842f71 JPM |
1792 | struct sk_buff *t_buf = *buf; |
1793 | struct tipc_link *l_ptr; | |
1794 | struct tipc_msg *t_msg = buf_msg(t_buf); | |
1795 | u32 bearer_id = msg_bearer_id(t_msg); | |
b97bf3fd | 1796 | |
1e9d47a9 JPM |
1797 | *buf = NULL; |
1798 | ||
cb4b102f DC |
1799 | if (bearer_id >= MAX_BEARERS) |
1800 | goto exit; | |
1dab3d5a | 1801 | |
02842f71 JPM |
1802 | l_ptr = n_ptr->links[bearer_id]; |
1803 | if (!l_ptr) | |
b97bf3fd | 1804 | goto exit; |
b97bf3fd | 1805 | |
02842f71 | 1806 | if (msg_type(t_msg) == DUPLICATE_MSG) |
c5898636 | 1807 | tipc_link_dup_rcv(l_ptr, t_buf); |
02842f71 JPM |
1808 | else if (msg_type(t_msg) == ORIGINAL_MSG) |
1809 | *buf = tipc_link_failover_rcv(l_ptr, t_buf); | |
1e9d47a9 JPM |
1810 | else |
1811 | pr_warn("%sunknown tunnel pkt received\n", link_co_err); | |
b97bf3fd | 1812 | exit: |
02842f71 | 1813 | kfree_skb(t_buf); |
1e9d47a9 | 1814 | return *buf != NULL; |
b97bf3fd PL |
1815 | } |
1816 | ||
2f55c437 | 1817 | static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol) |
b97bf3fd | 1818 | { |
2f55c437 YX |
1819 | unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4; |
1820 | ||
1821 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
5413b4c6 AS |
1822 | return; |
1823 | ||
2f55c437 YX |
1824 | l_ptr->tolerance = tol; |
1825 | l_ptr->cont_intv = msecs_to_jiffies(intv); | |
1826 | l_ptr->abort_limit = tol / (jiffies_to_msecs(l_ptr->cont_intv) / 4); | |
b97bf3fd PL |
1827 | } |
1828 | ||
e3eea1eb | 1829 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
b97bf3fd | 1830 | { |
e3eea1eb JPM |
1831 | int max_bulk = TIPC_MAX_PUBLICATIONS / (l->max_pkt / ITEM_SIZE); |
1832 | ||
1833 | l->window = win; | |
1f66d161 JPM |
1834 | l->backlog[TIPC_LOW_IMPORTANCE].limit = win / 2; |
1835 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = win; | |
1836 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = win / 2 * 3; | |
1837 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = win * 2; | |
1838 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; | |
b97bf3fd PL |
1839 | } |
1840 | ||
e099e86c | 1841 | /* tipc_link_find_owner - locate owner node of link by link's name |
f2f9800d | 1842 | * @net: the applicable net namespace |
e099e86c JPM |
1843 | * @name: pointer to link name string |
1844 | * @bearer_id: pointer to index in 'node->links' array where the link was found. | |
c4307285 | 1845 | * |
e099e86c | 1846 | * Returns pointer to node owning the link, or 0 if no matching link is found. |
b97bf3fd | 1847 | */ |
f2f9800d YX |
1848 | static struct tipc_node *tipc_link_find_owner(struct net *net, |
1849 | const char *link_name, | |
e099e86c | 1850 | unsigned int *bearer_id) |
b97bf3fd | 1851 | { |
f2f9800d | 1852 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
a18c4bc3 | 1853 | struct tipc_link *l_ptr; |
bbfbe47c | 1854 | struct tipc_node *n_ptr; |
886eaa1f | 1855 | struct tipc_node *found_node = NULL; |
bbfbe47c | 1856 | int i; |
b97bf3fd | 1857 | |
e099e86c | 1858 | *bearer_id = 0; |
6c7a762e | 1859 | rcu_read_lock(); |
f2f9800d | 1860 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
a11607f5 | 1861 | tipc_node_lock(n_ptr); |
bbfbe47c EH |
1862 | for (i = 0; i < MAX_BEARERS; i++) { |
1863 | l_ptr = n_ptr->links[i]; | |
e099e86c JPM |
1864 | if (l_ptr && !strcmp(l_ptr->name, link_name)) { |
1865 | *bearer_id = i; | |
1866 | found_node = n_ptr; | |
1867 | break; | |
1868 | } | |
bbfbe47c | 1869 | } |
a11607f5 | 1870 | tipc_node_unlock(n_ptr); |
e099e86c JPM |
1871 | if (found_node) |
1872 | break; | |
bbfbe47c | 1873 | } |
6c7a762e YX |
1874 | rcu_read_unlock(); |
1875 | ||
e099e86c | 1876 | return found_node; |
b97bf3fd PL |
1877 | } |
1878 | ||
b97bf3fd PL |
1879 | /** |
1880 | * link_reset_statistics - reset link statistics | |
1881 | * @l_ptr: pointer to link | |
1882 | */ | |
a18c4bc3 | 1883 | static void link_reset_statistics(struct tipc_link *l_ptr) |
b97bf3fd PL |
1884 | { |
1885 | memset(&l_ptr->stats, 0, sizeof(l_ptr->stats)); | |
1886 | l_ptr->stats.sent_info = l_ptr->next_out_no; | |
1887 | l_ptr->stats.recv_info = l_ptr->next_in_no; | |
1888 | } | |
1889 | ||
a18c4bc3 | 1890 | static void link_print(struct tipc_link *l_ptr, const char *str) |
b97bf3fd | 1891 | { |
7f9f95d9 | 1892 | struct tipc_net *tn = net_generic(l_ptr->owner->net, tipc_net_id); |
7a2f7d18 YX |
1893 | struct tipc_bearer *b_ptr; |
1894 | ||
1895 | rcu_read_lock(); | |
7f9f95d9 | 1896 | b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]); |
7a2f7d18 YX |
1897 | if (b_ptr) |
1898 | pr_info("%s Link %x<%s>:", str, l_ptr->addr, b_ptr->name); | |
1899 | rcu_read_unlock(); | |
8d64a5ba | 1900 | |
b97bf3fd | 1901 | if (link_working_unknown(l_ptr)) |
5deedde9 | 1902 | pr_cont(":WU\n"); |
8d64a5ba | 1903 | else if (link_reset_reset(l_ptr)) |
5deedde9 | 1904 | pr_cont(":RR\n"); |
8d64a5ba | 1905 | else if (link_reset_unknown(l_ptr)) |
5deedde9 | 1906 | pr_cont(":RU\n"); |
8d64a5ba | 1907 | else if (link_working_working(l_ptr)) |
5deedde9 PG |
1908 | pr_cont(":WW\n"); |
1909 | else | |
1910 | pr_cont("\n"); | |
b97bf3fd | 1911 | } |
0655f6a8 RA |
1912 | |
1913 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
1914 | */ | |
1915 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
1916 | { | |
1917 | int err; | |
1918 | ||
1919 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
1920 | tipc_nl_prop_policy); | |
1921 | if (err) | |
1922 | return err; | |
1923 | ||
1924 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1925 | u32 prio; | |
1926 | ||
1927 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1928 | if (prio > TIPC_MAX_LINK_PRI) | |
1929 | return -EINVAL; | |
1930 | } | |
1931 | ||
1932 | if (props[TIPC_NLA_PROP_TOL]) { | |
1933 | u32 tol; | |
1934 | ||
1935 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1936 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
1937 | return -EINVAL; | |
1938 | } | |
1939 | ||
1940 | if (props[TIPC_NLA_PROP_WIN]) { | |
1941 | u32 win; | |
1942 | ||
1943 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1944 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
1945 | return -EINVAL; | |
1946 | } | |
1947 | ||
1948 | return 0; | |
1949 | } | |
7be57fc6 | 1950 | |
f96ce7a2 RA |
1951 | int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info) |
1952 | { | |
1953 | int err; | |
1954 | int res = 0; | |
1955 | int bearer_id; | |
1956 | char *name; | |
1957 | struct tipc_link *link; | |
1958 | struct tipc_node *node; | |
1959 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
37e2d484 | 1960 | struct net *net = sock_net(skb->sk); |
f96ce7a2 RA |
1961 | |
1962 | if (!info->attrs[TIPC_NLA_LINK]) | |
1963 | return -EINVAL; | |
1964 | ||
1965 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
1966 | info->attrs[TIPC_NLA_LINK], | |
1967 | tipc_nl_link_policy); | |
1968 | if (err) | |
1969 | return err; | |
1970 | ||
1971 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
1972 | return -EINVAL; | |
1973 | ||
1974 | name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
1975 | ||
f2f9800d | 1976 | node = tipc_link_find_owner(net, name, &bearer_id); |
f96ce7a2 RA |
1977 | if (!node) |
1978 | return -EINVAL; | |
1979 | ||
1980 | tipc_node_lock(node); | |
1981 | ||
1982 | link = node->links[bearer_id]; | |
1983 | if (!link) { | |
1984 | res = -EINVAL; | |
1985 | goto out; | |
1986 | } | |
1987 | ||
1988 | if (attrs[TIPC_NLA_LINK_PROP]) { | |
1989 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; | |
1990 | ||
1991 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], | |
1992 | props); | |
1993 | if (err) { | |
1994 | res = err; | |
1995 | goto out; | |
1996 | } | |
1997 | ||
1998 | if (props[TIPC_NLA_PROP_TOL]) { | |
1999 | u32 tol; | |
2000 | ||
2001 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
2002 | link_set_supervision_props(link, tol); | |
2003 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0, 0); | |
2004 | } | |
2005 | if (props[TIPC_NLA_PROP_PRIO]) { | |
2006 | u32 prio; | |
2007 | ||
2008 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
2009 | link->priority = prio; | |
2010 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio, 0); | |
2011 | } | |
2012 | if (props[TIPC_NLA_PROP_WIN]) { | |
2013 | u32 win; | |
2014 | ||
2015 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
2016 | tipc_link_set_queue_limits(link, win); | |
2017 | } | |
2018 | } | |
2019 | ||
2020 | out: | |
2021 | tipc_node_unlock(node); | |
2022 | ||
2023 | return res; | |
2024 | } | |
d8182804 RA |
2025 | |
2026 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) | |
7be57fc6 RA |
2027 | { |
2028 | int i; | |
2029 | struct nlattr *stats; | |
2030 | ||
2031 | struct nla_map { | |
2032 | u32 key; | |
2033 | u32 val; | |
2034 | }; | |
2035 | ||
2036 | struct nla_map map[] = { | |
2037 | {TIPC_NLA_STATS_RX_INFO, s->recv_info}, | |
2038 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, | |
2039 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
2040 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
2041 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
2042 | {TIPC_NLA_STATS_TX_INFO, s->sent_info}, | |
2043 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, | |
2044 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
2045 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
2046 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
2047 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
2048 | s->msg_length_counts : 1}, | |
2049 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
2050 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
2051 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
2052 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
2053 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
2054 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
2055 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
2056 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
2057 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
2058 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
2059 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
2060 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
2061 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
2062 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
2063 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
2064 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
2065 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
2066 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
2067 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
2068 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
2069 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
2070 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
2071 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
2072 | }; | |
2073 | ||
2074 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
2075 | if (!stats) | |
2076 | return -EMSGSIZE; | |
2077 | ||
2078 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
2079 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
2080 | goto msg_full; | |
2081 | ||
2082 | nla_nest_end(skb, stats); | |
2083 | ||
2084 | return 0; | |
2085 | msg_full: | |
2086 | nla_nest_cancel(skb, stats); | |
2087 | ||
2088 | return -EMSGSIZE; | |
2089 | } | |
2090 | ||
2091 | /* Caller should hold appropriate locks to protect the link */ | |
34747539 YX |
2092 | static int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
2093 | struct tipc_link *link) | |
7be57fc6 RA |
2094 | { |
2095 | int err; | |
2096 | void *hdr; | |
2097 | struct nlattr *attrs; | |
2098 | struct nlattr *prop; | |
34747539 | 2099 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
7be57fc6 | 2100 | |
bfb3e5dd | 2101 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
7be57fc6 RA |
2102 | NLM_F_MULTI, TIPC_NL_LINK_GET); |
2103 | if (!hdr) | |
2104 | return -EMSGSIZE; | |
2105 | ||
2106 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
2107 | if (!attrs) | |
2108 | goto msg_full; | |
2109 | ||
2110 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
2111 | goto attr_msg_full; | |
2112 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, | |
34747539 | 2113 | tipc_cluster_mask(tn->own_addr))) |
7be57fc6 RA |
2114 | goto attr_msg_full; |
2115 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->max_pkt)) | |
2116 | goto attr_msg_full; | |
2117 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->next_in_no)) | |
2118 | goto attr_msg_full; | |
2119 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->next_out_no)) | |
2120 | goto attr_msg_full; | |
2121 | ||
2122 | if (tipc_link_is_up(link)) | |
2123 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2124 | goto attr_msg_full; | |
2125 | if (tipc_link_is_active(link)) | |
2126 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) | |
2127 | goto attr_msg_full; | |
2128 | ||
2129 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
2130 | if (!prop) | |
2131 | goto attr_msg_full; | |
2132 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2133 | goto prop_msg_full; | |
2134 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
2135 | goto prop_msg_full; | |
2136 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 2137 | link->window)) |
7be57fc6 RA |
2138 | goto prop_msg_full; |
2139 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2140 | goto prop_msg_full; | |
2141 | nla_nest_end(msg->skb, prop); | |
2142 | ||
2143 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
2144 | if (err) | |
2145 | goto attr_msg_full; | |
2146 | ||
2147 | nla_nest_end(msg->skb, attrs); | |
2148 | genlmsg_end(msg->skb, hdr); | |
2149 | ||
2150 | return 0; | |
2151 | ||
2152 | prop_msg_full: | |
2153 | nla_nest_cancel(msg->skb, prop); | |
2154 | attr_msg_full: | |
2155 | nla_nest_cancel(msg->skb, attrs); | |
2156 | msg_full: | |
2157 | genlmsg_cancel(msg->skb, hdr); | |
2158 | ||
2159 | return -EMSGSIZE; | |
2160 | } | |
2161 | ||
2162 | /* Caller should hold node lock */ | |
34747539 YX |
2163 | static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg, |
2164 | struct tipc_node *node, u32 *prev_link) | |
7be57fc6 RA |
2165 | { |
2166 | u32 i; | |
2167 | int err; | |
2168 | ||
2169 | for (i = *prev_link; i < MAX_BEARERS; i++) { | |
2170 | *prev_link = i; | |
2171 | ||
2172 | if (!node->links[i]) | |
2173 | continue; | |
2174 | ||
34747539 | 2175 | err = __tipc_nl_add_link(net, msg, node->links[i]); |
7be57fc6 RA |
2176 | if (err) |
2177 | return err; | |
2178 | } | |
2179 | *prev_link = 0; | |
2180 | ||
2181 | return 0; | |
2182 | } | |
2183 | ||
2184 | int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2185 | { | |
f2f9800d YX |
2186 | struct net *net = sock_net(skb->sk); |
2187 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
7be57fc6 RA |
2188 | struct tipc_node *node; |
2189 | struct tipc_nl_msg msg; | |
2190 | u32 prev_node = cb->args[0]; | |
2191 | u32 prev_link = cb->args[1]; | |
2192 | int done = cb->args[2]; | |
2193 | int err; | |
2194 | ||
2195 | if (done) | |
2196 | return 0; | |
2197 | ||
2198 | msg.skb = skb; | |
2199 | msg.portid = NETLINK_CB(cb->skb).portid; | |
2200 | msg.seq = cb->nlh->nlmsg_seq; | |
2201 | ||
2202 | rcu_read_lock(); | |
2203 | ||
2204 | if (prev_node) { | |
f2f9800d | 2205 | node = tipc_node_find(net, prev_node); |
7be57fc6 RA |
2206 | if (!node) { |
2207 | /* We never set seq or call nl_dump_check_consistent() | |
2208 | * this means that setting prev_seq here will cause the | |
2209 | * consistence check to fail in the netlink callback | |
2210 | * handler. Resulting in the last NLMSG_DONE message | |
2211 | * having the NLM_F_DUMP_INTR flag set. | |
2212 | */ | |
2213 | cb->prev_seq = 1; | |
2214 | goto out; | |
2215 | } | |
2216 | ||
f2f9800d YX |
2217 | list_for_each_entry_continue_rcu(node, &tn->node_list, |
2218 | list) { | |
7be57fc6 | 2219 | tipc_node_lock(node); |
34747539 YX |
2220 | err = __tipc_nl_add_node_links(net, &msg, node, |
2221 | &prev_link); | |
7be57fc6 RA |
2222 | tipc_node_unlock(node); |
2223 | if (err) | |
2224 | goto out; | |
2225 | ||
2226 | prev_node = node->addr; | |
2227 | } | |
2228 | } else { | |
1da46568 | 2229 | err = tipc_nl_add_bc_link(net, &msg); |
7be57fc6 RA |
2230 | if (err) |
2231 | goto out; | |
2232 | ||
f2f9800d | 2233 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
7be57fc6 | 2234 | tipc_node_lock(node); |
34747539 YX |
2235 | err = __tipc_nl_add_node_links(net, &msg, node, |
2236 | &prev_link); | |
7be57fc6 RA |
2237 | tipc_node_unlock(node); |
2238 | if (err) | |
2239 | goto out; | |
2240 | ||
2241 | prev_node = node->addr; | |
2242 | } | |
2243 | } | |
2244 | done = 1; | |
2245 | out: | |
2246 | rcu_read_unlock(); | |
2247 | ||
2248 | cb->args[0] = prev_node; | |
2249 | cb->args[1] = prev_link; | |
2250 | cb->args[2] = done; | |
2251 | ||
2252 | return skb->len; | |
2253 | } | |
2254 | ||
2255 | int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info) | |
2256 | { | |
f2f9800d | 2257 | struct net *net = genl_info_net(info); |
7be57fc6 RA |
2258 | struct sk_buff *ans_skb; |
2259 | struct tipc_nl_msg msg; | |
2260 | struct tipc_link *link; | |
2261 | struct tipc_node *node; | |
2262 | char *name; | |
2263 | int bearer_id; | |
2264 | int err; | |
2265 | ||
2266 | if (!info->attrs[TIPC_NLA_LINK_NAME]) | |
2267 | return -EINVAL; | |
2268 | ||
2269 | name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]); | |
f2f9800d | 2270 | node = tipc_link_find_owner(net, name, &bearer_id); |
7be57fc6 RA |
2271 | if (!node) |
2272 | return -EINVAL; | |
2273 | ||
2274 | ans_skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
2275 | if (!ans_skb) | |
2276 | return -ENOMEM; | |
2277 | ||
2278 | msg.skb = ans_skb; | |
2279 | msg.portid = info->snd_portid; | |
2280 | msg.seq = info->snd_seq; | |
2281 | ||
2282 | tipc_node_lock(node); | |
2283 | link = node->links[bearer_id]; | |
2284 | if (!link) { | |
2285 | err = -EINVAL; | |
2286 | goto err_out; | |
2287 | } | |
2288 | ||
34747539 | 2289 | err = __tipc_nl_add_link(net, &msg, link); |
7be57fc6 RA |
2290 | if (err) |
2291 | goto err_out; | |
2292 | ||
2293 | tipc_node_unlock(node); | |
2294 | ||
2295 | return genlmsg_reply(ans_skb, info); | |
2296 | ||
2297 | err_out: | |
2298 | tipc_node_unlock(node); | |
2299 | nlmsg_free(ans_skb); | |
2300 | ||
2301 | return err; | |
2302 | } | |
ae36342b RA |
2303 | |
2304 | int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info) | |
2305 | { | |
2306 | int err; | |
2307 | char *link_name; | |
2308 | unsigned int bearer_id; | |
2309 | struct tipc_link *link; | |
2310 | struct tipc_node *node; | |
2311 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
1817877b | 2312 | struct net *net = sock_net(skb->sk); |
ae36342b RA |
2313 | |
2314 | if (!info->attrs[TIPC_NLA_LINK]) | |
2315 | return -EINVAL; | |
2316 | ||
2317 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
2318 | info->attrs[TIPC_NLA_LINK], | |
2319 | tipc_nl_link_policy); | |
2320 | if (err) | |
2321 | return err; | |
2322 | ||
2323 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
2324 | return -EINVAL; | |
2325 | ||
2326 | link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
2327 | ||
2328 | if (strcmp(link_name, tipc_bclink_name) == 0) { | |
1da46568 | 2329 | err = tipc_bclink_reset_stats(net); |
ae36342b RA |
2330 | if (err) |
2331 | return err; | |
2332 | return 0; | |
2333 | } | |
2334 | ||
f2f9800d | 2335 | node = tipc_link_find_owner(net, link_name, &bearer_id); |
ae36342b RA |
2336 | if (!node) |
2337 | return -EINVAL; | |
2338 | ||
2339 | tipc_node_lock(node); | |
2340 | ||
2341 | link = node->links[bearer_id]; | |
2342 | if (!link) { | |
2343 | tipc_node_unlock(node); | |
2344 | return -EINVAL; | |
2345 | } | |
2346 | ||
2347 | link_reset_statistics(link); | |
2348 | ||
2349 | tipc_node_unlock(node); | |
2350 | ||
2351 | return 0; | |
2352 | } |