Commit | Line | Data |
---|---|---|
b97bf3fd PL |
1 | /* |
2 | * net/tipc/link.c: TIPC link code | |
c4307285 | 3 | * |
c1336ee4 | 4 | * Copyright (c) 1996-2007, 2012-2015, Ericsson AB |
198d73b8 | 5 | * Copyright (c) 2004-2007, 2010-2013, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the names of the copyright holders nor the names of its | |
17 | * contributors may be used to endorse or promote products derived from | |
18 | * this software without specific prior written permission. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
20 | * Alternatively, this software may be distributed under the terms of the |
21 | * GNU General Public License ("GPL") version 2 as published by the Free | |
22 | * Software Foundation. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
37 | #include "core.h" | |
e3eea1eb | 38 | #include "subscr.h" |
b97bf3fd | 39 | #include "link.h" |
7be57fc6 | 40 | #include "bcast.h" |
9816f061 | 41 | #include "socket.h" |
b97bf3fd | 42 | #include "name_distr.h" |
b97bf3fd | 43 | #include "discover.h" |
0655f6a8 | 44 | #include "netlink.h" |
b97bf3fd | 45 | |
796c75d0 YX |
46 | #include <linux/pkt_sched.h> |
47 | ||
2cf8aa19 EH |
48 | /* |
49 | * Error message prefixes | |
50 | */ | |
51 | static const char *link_co_err = "Link changeover error, "; | |
52 | static const char *link_rst_msg = "Resetting link "; | |
53 | static const char *link_unk_evt = "Unknown link event "; | |
b97bf3fd | 54 | |
7be57fc6 RA |
55 | static const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = { |
56 | [TIPC_NLA_LINK_UNSPEC] = { .type = NLA_UNSPEC }, | |
57 | [TIPC_NLA_LINK_NAME] = { | |
58 | .type = NLA_STRING, | |
59 | .len = TIPC_MAX_LINK_NAME | |
60 | }, | |
61 | [TIPC_NLA_LINK_MTU] = { .type = NLA_U32 }, | |
62 | [TIPC_NLA_LINK_BROADCAST] = { .type = NLA_FLAG }, | |
63 | [TIPC_NLA_LINK_UP] = { .type = NLA_FLAG }, | |
64 | [TIPC_NLA_LINK_ACTIVE] = { .type = NLA_FLAG }, | |
65 | [TIPC_NLA_LINK_PROP] = { .type = NLA_NESTED }, | |
66 | [TIPC_NLA_LINK_STATS] = { .type = NLA_NESTED }, | |
67 | [TIPC_NLA_LINK_RX] = { .type = NLA_U32 }, | |
68 | [TIPC_NLA_LINK_TX] = { .type = NLA_U32 } | |
69 | }; | |
70 | ||
0655f6a8 RA |
71 | /* Properties valid for media, bearar and link */ |
72 | static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = { | |
73 | [TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC }, | |
74 | [TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 }, | |
75 | [TIPC_NLA_PROP_TOL] = { .type = NLA_U32 }, | |
76 | [TIPC_NLA_PROP_WIN] = { .type = NLA_U32 } | |
77 | }; | |
78 | ||
a686e685 AS |
79 | /* |
80 | * Out-of-range value for link session numbers | |
81 | */ | |
d3504c34 | 82 | #define WILDCARD_SESSION 0x10000 |
a686e685 | 83 | |
d3504c34 | 84 | /* State value stored in 'failover_pkts' |
b97bf3fd | 85 | */ |
d3504c34 | 86 | #define FIRST_FAILOVER 0xffffu |
b97bf3fd | 87 | |
d3504c34 | 88 | /* Link FSM states and events: |
b97bf3fd | 89 | */ |
d3504c34 | 90 | enum { |
6ab30f9c JPM |
91 | TIPC_LINK_WORKING, |
92 | TIPC_LINK_PROBING, | |
93 | TIPC_LINK_RESETTING, | |
94 | TIPC_LINK_ESTABLISHING | |
d3504c34 JPM |
95 | }; |
96 | ||
97 | enum { | |
98 | PEER_RESET_EVT = RESET_MSG, | |
99 | ACTIVATE_EVT = ACTIVATE_MSG, | |
100 | TRAFFIC_EVT, /* Any other valid msg from peer */ | |
101 | SILENCE_EVT /* Peer was silent during last timer interval*/ | |
102 | }; | |
103 | ||
104 | /* Link FSM state checking routines | |
105 | */ | |
6ab30f9c | 106 | static int link_working(struct tipc_link *l) |
d3504c34 | 107 | { |
6ab30f9c | 108 | return l->state == TIPC_LINK_WORKING; |
d3504c34 JPM |
109 | } |
110 | ||
6ab30f9c | 111 | static int link_probing(struct tipc_link *l) |
d3504c34 | 112 | { |
6ab30f9c | 113 | return l->state == TIPC_LINK_PROBING; |
d3504c34 JPM |
114 | } |
115 | ||
6ab30f9c | 116 | static int link_resetting(struct tipc_link *l) |
d3504c34 | 117 | { |
6ab30f9c | 118 | return l->state == TIPC_LINK_RESETTING; |
d3504c34 JPM |
119 | } |
120 | ||
6ab30f9c | 121 | static int link_establishing(struct tipc_link *l) |
d3504c34 | 122 | { |
6ab30f9c | 123 | return l->state == TIPC_LINK_ESTABLISHING; |
d3504c34 | 124 | } |
b97bf3fd | 125 | |
c5898636 JPM |
126 | static void link_handle_out_of_seq_msg(struct tipc_link *link, |
127 | struct sk_buff *skb); | |
128 | static void tipc_link_proto_rcv(struct tipc_link *link, | |
129 | struct sk_buff *skb); | |
2f55c437 | 130 | static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol); |
a18c4bc3 | 131 | static void link_state_event(struct tipc_link *l_ptr, u32 event); |
426cc2b8 JPM |
132 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
133 | u16 rcvgap, int tolerance, int priority, | |
134 | struct sk_buff_head *xmitq); | |
a18c4bc3 PG |
135 | static void link_reset_statistics(struct tipc_link *l_ptr); |
136 | static void link_print(struct tipc_link *l_ptr, const char *str); | |
247f0f3c YX |
137 | static void tipc_link_sync_xmit(struct tipc_link *l); |
138 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf); | |
c637c103 JPM |
139 | static void tipc_link_input(struct tipc_link *l, struct sk_buff *skb); |
140 | static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb); | |
dff29b1a | 141 | static bool tipc_link_failover_rcv(struct tipc_link *l, struct sk_buff **skb); |
cd4eee3c | 142 | static void link_set_timer(struct tipc_link *link, unsigned long time); |
6ab30f9c JPM |
143 | static void link_activate(struct tipc_link *link); |
144 | ||
b97bf3fd | 145 | /* |
05790c64 | 146 | * Simple link routines |
b97bf3fd | 147 | */ |
05790c64 | 148 | static unsigned int align(unsigned int i) |
b97bf3fd PL |
149 | { |
150 | return (i + 3) & ~3u; | |
151 | } | |
152 | ||
2d72d495 JPM |
153 | static void tipc_link_release(struct kref *kref) |
154 | { | |
155 | kfree(container_of(kref, struct tipc_link, ref)); | |
156 | } | |
157 | ||
158 | static void tipc_link_get(struct tipc_link *l_ptr) | |
159 | { | |
160 | kref_get(&l_ptr->ref); | |
161 | } | |
162 | ||
163 | static void tipc_link_put(struct tipc_link *l_ptr) | |
164 | { | |
165 | kref_put(&l_ptr->ref, tipc_link_release); | |
166 | } | |
167 | ||
8b4ed863 JPM |
168 | static struct tipc_link *tipc_parallel_link(struct tipc_link *l) |
169 | { | |
9d13ec65 JPM |
170 | struct tipc_node *n = l->owner; |
171 | ||
172 | if (node_active_link(n, 0) != l) | |
173 | return node_active_link(n, 0); | |
174 | return node_active_link(n, 1); | |
8b4ed863 JPM |
175 | } |
176 | ||
b97bf3fd | 177 | /* |
05790c64 | 178 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 179 | */ |
a18c4bc3 | 180 | int tipc_link_is_up(struct tipc_link *l_ptr) |
b97bf3fd PL |
181 | { |
182 | if (!l_ptr) | |
183 | return 0; | |
6ab30f9c | 184 | return link_working(l_ptr) || link_probing(l_ptr); |
b97bf3fd PL |
185 | } |
186 | ||
9d13ec65 | 187 | int tipc_link_is_active(struct tipc_link *l) |
b97bf3fd | 188 | { |
9d13ec65 JPM |
189 | struct tipc_node *n = l->owner; |
190 | ||
191 | return (node_active_link(n, 0) == l) || (node_active_link(n, 1) == l); | |
b97bf3fd PL |
192 | } |
193 | ||
b97bf3fd PL |
194 | /** |
195 | * link_timeout - handle expiration of link timer | |
196 | * @l_ptr: pointer to link | |
b97bf3fd | 197 | */ |
2f55c437 | 198 | static void link_timeout(unsigned long data) |
b97bf3fd | 199 | { |
2f55c437 | 200 | struct tipc_link *l_ptr = (struct tipc_link *)data; |
58dc55f2 YX |
201 | struct sk_buff *skb; |
202 | ||
4323add6 | 203 | tipc_node_lock(l_ptr->owner); |
b97bf3fd PL |
204 | |
205 | /* update counters used in statistical profiling of send traffic */ | |
05dcc5aa | 206 | l_ptr->stats.accu_queue_sz += skb_queue_len(&l_ptr->transmq); |
b97bf3fd PL |
207 | l_ptr->stats.queue_sz_counts++; |
208 | ||
05dcc5aa | 209 | skb = skb_peek(&l_ptr->transmq); |
58dc55f2 YX |
210 | if (skb) { |
211 | struct tipc_msg *msg = buf_msg(skb); | |
b97bf3fd PL |
212 | u32 length = msg_size(msg); |
213 | ||
f64f9e71 JP |
214 | if ((msg_user(msg) == MSG_FRAGMENTER) && |
215 | (msg_type(msg) == FIRST_FRAGMENT)) { | |
b97bf3fd PL |
216 | length = msg_size(msg_get_wrapped(msg)); |
217 | } | |
218 | if (length) { | |
219 | l_ptr->stats.msg_lengths_total += length; | |
220 | l_ptr->stats.msg_length_counts++; | |
221 | if (length <= 64) | |
222 | l_ptr->stats.msg_length_profile[0]++; | |
223 | else if (length <= 256) | |
224 | l_ptr->stats.msg_length_profile[1]++; | |
225 | else if (length <= 1024) | |
226 | l_ptr->stats.msg_length_profile[2]++; | |
227 | else if (length <= 4096) | |
228 | l_ptr->stats.msg_length_profile[3]++; | |
229 | else if (length <= 16384) | |
230 | l_ptr->stats.msg_length_profile[4]++; | |
231 | else if (length <= 32768) | |
232 | l_ptr->stats.msg_length_profile[5]++; | |
233 | else | |
234 | l_ptr->stats.msg_length_profile[6]++; | |
235 | } | |
236 | } | |
237 | ||
238 | /* do all other link processing performed on a periodic basis */ | |
6ab30f9c | 239 | if (l_ptr->silent_intv_cnt) |
cd4eee3c | 240 | link_state_event(l_ptr, SILENCE_EVT); |
6ab30f9c JPM |
241 | else if (link_working(l_ptr) && tipc_bclink_acks_missing(l_ptr->owner)) |
242 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0); | |
243 | ||
cd4eee3c | 244 | l_ptr->silent_intv_cnt++; |
05dcc5aa | 245 | if (skb_queue_len(&l_ptr->backlogq)) |
47b4c9a8 | 246 | tipc_link_push_packets(l_ptr); |
cd4eee3c | 247 | link_set_timer(l_ptr, l_ptr->keepalive_intv); |
4323add6 | 248 | tipc_node_unlock(l_ptr->owner); |
2d72d495 | 249 | tipc_link_put(l_ptr); |
b97bf3fd PL |
250 | } |
251 | ||
2f55c437 | 252 | static void link_set_timer(struct tipc_link *link, unsigned long time) |
b97bf3fd | 253 | { |
2d72d495 JPM |
254 | if (!mod_timer(&link->timer, jiffies + time)) |
255 | tipc_link_get(link); | |
b97bf3fd PL |
256 | } |
257 | ||
258 | /** | |
4323add6 | 259 | * tipc_link_create - create a new link |
37b9c08a | 260 | * @n_ptr: pointer to associated node |
b97bf3fd | 261 | * @b_ptr: pointer to associated bearer |
b97bf3fd | 262 | * @media_addr: media address to use when sending messages over link |
c4307285 | 263 | * |
b97bf3fd PL |
264 | * Returns pointer to link. |
265 | */ | |
a18c4bc3 | 266 | struct tipc_link *tipc_link_create(struct tipc_node *n_ptr, |
c61dd61d | 267 | struct tipc_bearer *b_ptr, |
d39bbd44 JPM |
268 | const struct tipc_media_addr *media_addr, |
269 | struct sk_buff_head *inputq, | |
270 | struct sk_buff_head *namedq) | |
b97bf3fd | 271 | { |
34747539 | 272 | struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id); |
a18c4bc3 | 273 | struct tipc_link *l_ptr; |
b97bf3fd PL |
274 | struct tipc_msg *msg; |
275 | char *if_name; | |
37b9c08a AS |
276 | char addr_string[16]; |
277 | u32 peer = n_ptr->addr; | |
278 | ||
0372bf5c | 279 | if (n_ptr->link_cnt >= MAX_BEARERS) { |
37b9c08a | 280 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
a97b9d3f JPM |
281 | pr_err("Cannot establish %uth link to %s. Max %u allowed.\n", |
282 | n_ptr->link_cnt, addr_string, MAX_BEARERS); | |
37b9c08a AS |
283 | return NULL; |
284 | } | |
285 | ||
9d13ec65 | 286 | if (n_ptr->links[b_ptr->identity].link) { |
37b9c08a | 287 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
2cf8aa19 EH |
288 | pr_err("Attempt to establish second link on <%s> to %s\n", |
289 | b_ptr->name, addr_string); | |
37b9c08a AS |
290 | return NULL; |
291 | } | |
b97bf3fd | 292 | |
0da974f4 | 293 | l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC); |
b97bf3fd | 294 | if (!l_ptr) { |
2cf8aa19 | 295 | pr_warn("Link creation failed, no memory\n"); |
b97bf3fd PL |
296 | return NULL; |
297 | } | |
2d72d495 | 298 | kref_init(&l_ptr->ref); |
b97bf3fd | 299 | l_ptr->addr = peer; |
2d627b92 | 300 | if_name = strchr(b_ptr->name, ':') + 1; |
062b4c99 | 301 | sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:unknown", |
34747539 YX |
302 | tipc_zone(tn->own_addr), tipc_cluster(tn->own_addr), |
303 | tipc_node(tn->own_addr), | |
b97bf3fd PL |
304 | if_name, |
305 | tipc_zone(peer), tipc_cluster(peer), tipc_node(peer)); | |
062b4c99 | 306 | /* note: peer i/f name is updated by reset/activate message */ |
b97bf3fd | 307 | memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr)); |
37b9c08a | 308 | l_ptr->owner = n_ptr; |
d3504c34 | 309 | l_ptr->peer_session = WILDCARD_SESSION; |
7a2f7d18 | 310 | l_ptr->bearer_id = b_ptr->identity; |
5c216e1d | 311 | link_set_supervision_props(l_ptr, b_ptr->tolerance); |
6ab30f9c | 312 | l_ptr->state = TIPC_LINK_RESETTING; |
b97bf3fd PL |
313 | |
314 | l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg; | |
315 | msg = l_ptr->pmsg; | |
c5898636 | 316 | tipc_msg_init(tn->own_addr, msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, |
34747539 | 317 | l_ptr->addr); |
b97bf3fd | 318 | msg_set_size(msg, sizeof(l_ptr->proto_msg)); |
bafa29e3 | 319 | msg_set_session(msg, (tn->random & 0xffff)); |
b97bf3fd PL |
320 | msg_set_bearer_id(msg, b_ptr->identity); |
321 | strcpy((char *)msg_data(msg), if_name); | |
7a2f7d18 | 322 | l_ptr->net_plane = b_ptr->net_plane; |
ed193ece JPM |
323 | l_ptr->advertised_mtu = b_ptr->mtu; |
324 | l_ptr->mtu = l_ptr->advertised_mtu; | |
e3eea1eb JPM |
325 | l_ptr->priority = b_ptr->priority; |
326 | tipc_link_set_queue_limits(l_ptr, b_ptr->window); | |
a97b9d3f | 327 | l_ptr->snd_nxt = 1; |
05dcc5aa JPM |
328 | __skb_queue_head_init(&l_ptr->transmq); |
329 | __skb_queue_head_init(&l_ptr->backlogq); | |
330 | __skb_queue_head_init(&l_ptr->deferdq); | |
c637c103 | 331 | skb_queue_head_init(&l_ptr->wakeupq); |
d39bbd44 JPM |
332 | l_ptr->inputq = inputq; |
333 | l_ptr->namedq = namedq; | |
334 | skb_queue_head_init(l_ptr->inputq); | |
b97bf3fd | 335 | link_reset_statistics(l_ptr); |
37b9c08a | 336 | tipc_node_attach_link(n_ptr, l_ptr); |
2f55c437 | 337 | setup_timer(&l_ptr->timer, link_timeout, (unsigned long)l_ptr); |
d3504c34 | 338 | link_set_timer(l_ptr, l_ptr->keepalive_intv); |
b97bf3fd PL |
339 | return l_ptr; |
340 | } | |
341 | ||
2d72d495 | 342 | /** |
dff29b1a JPM |
343 | * tipc_link_delete - Delete a link |
344 | * @l: link to be deleted | |
2d72d495 | 345 | */ |
dff29b1a | 346 | void tipc_link_delete(struct tipc_link *l) |
2d72d495 | 347 | { |
dff29b1a JPM |
348 | tipc_link_reset(l); |
349 | if (del_timer(&l->timer)) | |
350 | tipc_link_put(l); | |
dff29b1a JPM |
351 | /* Delete link now, or when timer is finished: */ |
352 | tipc_link_reset_fragments(l); | |
353 | tipc_node_detach_link(l->owner, l); | |
354 | tipc_link_put(l); | |
2d72d495 JPM |
355 | } |
356 | ||
b1c29f6b | 357 | void tipc_link_delete_list(struct net *net, unsigned int bearer_id) |
8d8439b6 | 358 | { |
f2f9800d | 359 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
2d72d495 JPM |
360 | struct tipc_link *link; |
361 | struct tipc_node *node; | |
8d8439b6 | 362 | |
6c7a762e | 363 | rcu_read_lock(); |
2d72d495 JPM |
364 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
365 | tipc_node_lock(node); | |
9d13ec65 | 366 | link = node->links[bearer_id].link; |
dff29b1a | 367 | if (link) |
2d72d495 JPM |
368 | tipc_link_delete(link); |
369 | tipc_node_unlock(node); | |
8d8439b6 | 370 | } |
6c7a762e | 371 | rcu_read_unlock(); |
8d8439b6 | 372 | } |
b97bf3fd | 373 | |
6ab30f9c JPM |
374 | /** |
375 | * tipc_link_fsm_evt - link finite state machine | |
376 | * @l: pointer to link | |
377 | * @evt: state machine event to be processed | |
378 | * @xmitq: queue to prepend created protocol message, if any | |
379 | */ | |
380 | static int tipc_link_fsm_evt(struct tipc_link *l, int evt, | |
381 | struct sk_buff_head *xmitq) | |
382 | { | |
383 | int mtyp = 0, rc = 0; | |
384 | struct tipc_link *pl; | |
385 | enum { | |
386 | LINK_RESET = 1, | |
387 | LINK_ACTIVATE = (1 << 1), | |
388 | SND_PROBE = (1 << 2), | |
389 | SND_STATE = (1 << 3), | |
390 | SND_RESET = (1 << 4), | |
391 | SND_ACTIVATE = (1 << 5) | |
392 | } actions = 0; | |
393 | ||
394 | if (l->exec_mode == TIPC_LINK_BLOCKED) | |
395 | return rc; | |
396 | ||
397 | switch (l->state) { | |
398 | case TIPC_LINK_WORKING: | |
399 | switch (evt) { | |
400 | case TRAFFIC_EVT: | |
401 | case ACTIVATE_EVT: | |
402 | break; | |
403 | case SILENCE_EVT: | |
404 | l->state = TIPC_LINK_PROBING; | |
405 | actions |= SND_PROBE; | |
406 | break; | |
407 | case PEER_RESET_EVT: | |
408 | actions |= LINK_RESET | SND_ACTIVATE; | |
409 | break; | |
410 | default: | |
411 | pr_debug("%s%u WORKING\n", link_unk_evt, evt); | |
412 | } | |
413 | break; | |
414 | case TIPC_LINK_PROBING: | |
415 | switch (evt) { | |
416 | case TRAFFIC_EVT: | |
417 | case ACTIVATE_EVT: | |
418 | l->state = TIPC_LINK_WORKING; | |
419 | break; | |
420 | case PEER_RESET_EVT: | |
421 | actions |= LINK_RESET | SND_ACTIVATE; | |
422 | break; | |
423 | case SILENCE_EVT: | |
424 | if (l->silent_intv_cnt <= l->abort_limit) { | |
425 | actions |= SND_PROBE; | |
426 | break; | |
427 | } | |
428 | actions |= LINK_RESET | SND_RESET; | |
429 | break; | |
430 | default: | |
431 | pr_err("%s%u PROBING\n", link_unk_evt, evt); | |
432 | } | |
433 | break; | |
434 | case TIPC_LINK_RESETTING: | |
435 | switch (evt) { | |
436 | case TRAFFIC_EVT: | |
437 | break; | |
438 | case ACTIVATE_EVT: | |
439 | pl = node_active_link(l->owner, 0); | |
440 | if (pl && link_probing(pl)) | |
441 | break; | |
442 | actions |= LINK_ACTIVATE; | |
443 | if (l->owner->working_links == 1) | |
444 | tipc_link_sync_xmit(l); | |
445 | break; | |
446 | case PEER_RESET_EVT: | |
447 | l->state = TIPC_LINK_ESTABLISHING; | |
448 | actions |= SND_ACTIVATE; | |
449 | break; | |
450 | case SILENCE_EVT: | |
451 | actions |= SND_RESET; | |
452 | break; | |
453 | default: | |
454 | pr_err("%s%u in RESETTING\n", link_unk_evt, evt); | |
455 | } | |
456 | break; | |
457 | case TIPC_LINK_ESTABLISHING: | |
458 | switch (evt) { | |
459 | case TRAFFIC_EVT: | |
460 | case ACTIVATE_EVT: | |
461 | pl = node_active_link(l->owner, 0); | |
462 | if (pl && link_probing(pl)) | |
463 | break; | |
464 | actions |= LINK_ACTIVATE; | |
465 | if (l->owner->working_links == 1) | |
466 | tipc_link_sync_xmit(l); | |
467 | break; | |
468 | case PEER_RESET_EVT: | |
469 | break; | |
470 | case SILENCE_EVT: | |
471 | actions |= SND_ACTIVATE; | |
472 | break; | |
473 | default: | |
474 | pr_err("%s%u ESTABLISHING\n", link_unk_evt, evt); | |
475 | } | |
476 | break; | |
477 | default: | |
478 | pr_err("Unknown link state %u/%u\n", l->state, evt); | |
479 | } | |
480 | ||
481 | /* Perform actions as decided by FSM */ | |
482 | if (actions & LINK_RESET) { | |
483 | l->exec_mode = TIPC_LINK_BLOCKED; | |
484 | rc |= TIPC_LINK_DOWN_EVT; | |
485 | } | |
486 | if (actions & LINK_ACTIVATE) { | |
487 | l->exec_mode = TIPC_LINK_OPEN; | |
488 | rc |= TIPC_LINK_UP_EVT; | |
489 | } | |
490 | if (actions & (SND_STATE | SND_PROBE)) | |
491 | mtyp = STATE_MSG; | |
492 | if (actions & SND_RESET) | |
493 | mtyp = RESET_MSG; | |
494 | if (actions & SND_ACTIVATE) | |
495 | mtyp = ACTIVATE_MSG; | |
496 | if (actions & (SND_PROBE | SND_STATE | SND_RESET | SND_ACTIVATE)) | |
497 | tipc_link_build_proto_msg(l, mtyp, actions & SND_PROBE, | |
498 | 0, 0, 0, xmitq); | |
499 | return rc; | |
500 | } | |
501 | ||
b97bf3fd | 502 | /** |
3127a020 | 503 | * link_schedule_user - schedule a message sender for wakeup after congestion |
50100a5e | 504 | * @link: congested link |
3127a020 | 505 | * @list: message that was attempted sent |
50100a5e | 506 | * Create pseudo msg to send back to user when congestion abates |
22d85c79 | 507 | * Does not consume buffer list |
b97bf3fd | 508 | */ |
3127a020 | 509 | static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list) |
b97bf3fd | 510 | { |
3127a020 JPM |
511 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
512 | int imp = msg_importance(msg); | |
513 | u32 oport = msg_origport(msg); | |
514 | u32 addr = link_own_addr(link); | |
515 | struct sk_buff *skb; | |
516 | ||
517 | /* This really cannot happen... */ | |
518 | if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) { | |
519 | pr_warn("%s<%s>, send queue full", link_rst_msg, link->name); | |
22d85c79 | 520 | return -ENOBUFS; |
3127a020 JPM |
521 | } |
522 | /* Non-blocking sender: */ | |
523 | if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending) | |
524 | return -ELINKCONG; | |
525 | ||
526 | /* Create and schedule wakeup pseudo message */ | |
527 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, | |
528 | addr, addr, oport, 0, 0); | |
529 | if (!skb) | |
22d85c79 | 530 | return -ENOBUFS; |
3127a020 JPM |
531 | TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list); |
532 | TIPC_SKB_CB(skb)->chain_imp = imp; | |
533 | skb_queue_tail(&link->wakeupq, skb); | |
50100a5e | 534 | link->stats.link_congs++; |
3127a020 | 535 | return -ELINKCONG; |
b97bf3fd PL |
536 | } |
537 | ||
50100a5e JPM |
538 | /** |
539 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
540 | * @link: congested link | |
541 | * Move a number of waiting users, as permitted by available space in | |
542 | * the send queue, from link wait queue to node wait queue for wakeup | |
543 | */ | |
1f66d161 | 544 | void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 545 | { |
1f66d161 JPM |
546 | int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,}; |
547 | int imp, lim; | |
58d78b32 | 548 | struct sk_buff *skb, *tmp; |
50100a5e | 549 | |
1f66d161 JPM |
550 | skb_queue_walk_safe(&l->wakeupq, skb, tmp) { |
551 | imp = TIPC_SKB_CB(skb)->chain_imp; | |
552 | lim = l->window + l->backlog[imp].limit; | |
553 | pnd[imp] += TIPC_SKB_CB(skb)->chain_sz; | |
554 | if ((pnd[imp] + l->backlog[imp].len) >= lim) | |
b97bf3fd | 555 | break; |
1f66d161 | 556 | skb_unlink(skb, &l->wakeupq); |
d39bbd44 JPM |
557 | skb_queue_tail(l->inputq, skb); |
558 | l->owner->inputq = l->inputq; | |
1f66d161 | 559 | l->owner->action_flags |= TIPC_MSG_EVT; |
b97bf3fd | 560 | } |
b97bf3fd PL |
561 | } |
562 | ||
b97bf3fd | 563 | /** |
4323add6 | 564 | * tipc_link_reset_fragments - purge link's inbound message fragments queue |
b97bf3fd PL |
565 | * @l_ptr: pointer to link |
566 | */ | |
a18c4bc3 | 567 | void tipc_link_reset_fragments(struct tipc_link *l_ptr) |
b97bf3fd | 568 | { |
37e22164 JPM |
569 | kfree_skb(l_ptr->reasm_buf); |
570 | l_ptr->reasm_buf = NULL; | |
b97bf3fd PL |
571 | } |
572 | ||
7d967b67 | 573 | void tipc_link_purge_backlog(struct tipc_link *l) |
1f66d161 JPM |
574 | { |
575 | __skb_queue_purge(&l->backlogq); | |
576 | l->backlog[TIPC_LOW_IMPORTANCE].len = 0; | |
577 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0; | |
578 | l->backlog[TIPC_HIGH_IMPORTANCE].len = 0; | |
579 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0; | |
580 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0; | |
581 | } | |
582 | ||
c4307285 | 583 | /** |
581465fa | 584 | * tipc_link_purge_queues - purge all pkt queues associated with link |
b97bf3fd PL |
585 | * @l_ptr: pointer to link |
586 | */ | |
581465fa | 587 | void tipc_link_purge_queues(struct tipc_link *l_ptr) |
b97bf3fd | 588 | { |
05dcc5aa JPM |
589 | __skb_queue_purge(&l_ptr->deferdq); |
590 | __skb_queue_purge(&l_ptr->transmq); | |
1f66d161 | 591 | tipc_link_purge_backlog(l_ptr); |
4323add6 | 592 | tipc_link_reset_fragments(l_ptr); |
b97bf3fd PL |
593 | } |
594 | ||
a18c4bc3 | 595 | void tipc_link_reset(struct tipc_link *l_ptr) |
b97bf3fd | 596 | { |
b97bf3fd | 597 | u32 prev_state = l_ptr->state; |
5392d646 | 598 | int was_active_link = tipc_link_is_active(l_ptr); |
50100a5e | 599 | struct tipc_node *owner = l_ptr->owner; |
dff29b1a | 600 | struct tipc_link *pl = tipc_parallel_link(l_ptr); |
c4307285 | 601 | |
a686e685 | 602 | msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff)); |
b97bf3fd | 603 | |
a686e685 | 604 | /* Link is down, accept any session */ |
d3504c34 | 605 | l_ptr->peer_session = WILDCARD_SESSION; |
b97bf3fd | 606 | |
ed193ece JPM |
607 | /* Prepare for renewed mtu size negotiation */ |
608 | l_ptr->mtu = l_ptr->advertised_mtu; | |
c4307285 | 609 | |
6ab30f9c | 610 | l_ptr->state = TIPC_LINK_RESETTING; |
b97bf3fd | 611 | |
6ab30f9c JPM |
612 | if ((prev_state == TIPC_LINK_RESETTING) || |
613 | (prev_state == TIPC_LINK_ESTABLISHING)) | |
b97bf3fd PL |
614 | return; |
615 | ||
9d13ec65 | 616 | tipc_node_link_down(l_ptr->owner, l_ptr->bearer_id); |
7f9f95d9 | 617 | tipc_bearer_remove_dest(owner->net, l_ptr->bearer_id, l_ptr->addr); |
7368ddf1 | 618 | |
dff29b1a | 619 | if (was_active_link && tipc_node_is_up(l_ptr->owner) && (pl != l_ptr)) { |
d3504c34 | 620 | l_ptr->exec_mode = TIPC_LINK_BLOCKED; |
a97b9d3f | 621 | l_ptr->failover_checkpt = l_ptr->rcv_nxt; |
dff29b1a | 622 | pl->failover_pkts = FIRST_FAILOVER; |
a97b9d3f | 623 | pl->failover_checkpt = l_ptr->rcv_nxt; |
dff29b1a JPM |
624 | pl->failover_skb = l_ptr->reasm_buf; |
625 | } else { | |
626 | kfree_skb(l_ptr->reasm_buf); | |
b97bf3fd | 627 | } |
c637c103 | 628 | /* Clean up all queues, except inputq: */ |
05dcc5aa | 629 | __skb_queue_purge(&l_ptr->transmq); |
05dcc5aa | 630 | __skb_queue_purge(&l_ptr->deferdq); |
e6441bae | 631 | if (!owner->inputq) |
d39bbd44 | 632 | owner->inputq = l_ptr->inputq; |
e6441bae JPM |
633 | skb_queue_splice_init(&l_ptr->wakeupq, owner->inputq); |
634 | if (!skb_queue_empty(owner->inputq)) | |
c637c103 | 635 | owner->action_flags |= TIPC_MSG_EVT; |
1f66d161 | 636 | tipc_link_purge_backlog(l_ptr); |
dff29b1a | 637 | l_ptr->reasm_buf = NULL; |
05dcc5aa | 638 | l_ptr->rcv_unacked = 0; |
a97b9d3f JPM |
639 | l_ptr->snd_nxt = 1; |
640 | l_ptr->silent_intv_cnt = 0; | |
b97bf3fd PL |
641 | l_ptr->stale_count = 0; |
642 | link_reset_statistics(l_ptr); | |
b97bf3fd PL |
643 | } |
644 | ||
7f9f95d9 | 645 | static void link_activate(struct tipc_link *link) |
b97bf3fd | 646 | { |
7f9f95d9 YX |
647 | struct tipc_node *node = link->owner; |
648 | ||
a97b9d3f | 649 | link->rcv_nxt = 1; |
7f9f95d9 | 650 | link->stats.recv_info = 1; |
cd4eee3c | 651 | link->silent_intv_cnt = 0; |
6ab30f9c JPM |
652 | link->state = TIPC_LINK_WORKING; |
653 | link->exec_mode = TIPC_LINK_OPEN; | |
9d13ec65 | 654 | tipc_node_link_up(node, link->bearer_id); |
7f9f95d9 | 655 | tipc_bearer_add_dest(node->net, link->bearer_id, link->addr); |
b97bf3fd PL |
656 | } |
657 | ||
658 | /** | |
659 | * link_state_event - link finite state machine | |
660 | * @l_ptr: pointer to link | |
661 | * @event: state machine event to process | |
662 | */ | |
6ab30f9c | 663 | static void link_state_event(struct tipc_link *l, unsigned int evt) |
b97bf3fd | 664 | { |
6ab30f9c JPM |
665 | int rc; |
666 | struct sk_buff_head xmitq; | |
667 | struct sk_buff *skb; | |
b97bf3fd | 668 | |
6ab30f9c | 669 | if (l->exec_mode == TIPC_LINK_BLOCKED) |
77a7e07a | 670 | return; |
b97bf3fd | 671 | |
6ab30f9c JPM |
672 | __skb_queue_head_init(&xmitq); |
673 | ||
674 | rc = tipc_link_fsm_evt(l, evt, &xmitq); | |
675 | ||
676 | if (rc & TIPC_LINK_UP_EVT) | |
677 | link_activate(l); | |
678 | ||
679 | if (rc & TIPC_LINK_DOWN_EVT) | |
680 | tipc_link_reset(l); | |
681 | ||
682 | skb = __skb_dequeue(&xmitq); | |
683 | if (!skb) | |
684 | return; | |
685 | tipc_bearer_send(l->owner->net, l->bearer_id, skb, &l->media_addr); | |
b97bf3fd PL |
686 | } |
687 | ||
4f1688b2 | 688 | /** |
9fbfb8b1 | 689 | * __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked |
4f1688b2 | 690 | * @link: link to use |
a6ca1094 YX |
691 | * @list: chain of buffers containing message |
692 | * | |
22d85c79 | 693 | * Consumes the buffer chain, except when returning an error code, |
3127a020 JPM |
694 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS |
695 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
4f1688b2 | 696 | */ |
7f9f95d9 YX |
697 | int __tipc_link_xmit(struct net *net, struct tipc_link *link, |
698 | struct sk_buff_head *list) | |
4f1688b2 | 699 | { |
a6ca1094 | 700 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
05dcc5aa | 701 | unsigned int maxwin = link->window; |
f21e897e | 702 | unsigned int i, imp = msg_importance(msg); |
ed193ece | 703 | uint mtu = link->mtu; |
a97b9d3f JPM |
704 | u16 ack = mod(link->rcv_nxt - 1); |
705 | u16 seqno = link->snd_nxt; | |
e4bf4f76 | 706 | u16 bc_last_in = link->owner->bclink.last_in; |
4f1688b2 | 707 | struct tipc_media_addr *addr = &link->media_addr; |
05dcc5aa JPM |
708 | struct sk_buff_head *transmq = &link->transmq; |
709 | struct sk_buff_head *backlogq = &link->backlogq; | |
dd3f9e70 | 710 | struct sk_buff *skb, *bskb; |
4f1688b2 | 711 | |
f21e897e JPM |
712 | /* Match msg importance against this and all higher backlog limits: */ |
713 | for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) { | |
714 | if (unlikely(link->backlog[i].len >= link->backlog[i].limit)) | |
715 | return link_schedule_user(link, list); | |
716 | } | |
22d85c79 | 717 | if (unlikely(msg_size(msg) > mtu)) |
4f1688b2 | 718 | return -EMSGSIZE; |
22d85c79 | 719 | |
05dcc5aa | 720 | /* Prepare each packet for sending, and add to relevant queue: */ |
dd3f9e70 JPM |
721 | while (skb_queue_len(list)) { |
722 | skb = skb_peek(list); | |
58dc55f2 | 723 | msg = buf_msg(skb); |
05dcc5aa JPM |
724 | msg_set_seqno(msg, seqno); |
725 | msg_set_ack(msg, ack); | |
4f1688b2 JPM |
726 | msg_set_bcast_ack(msg, bc_last_in); |
727 | ||
05dcc5aa | 728 | if (likely(skb_queue_len(transmq) < maxwin)) { |
dd3f9e70 | 729 | __skb_dequeue(list); |
05dcc5aa JPM |
730 | __skb_queue_tail(transmq, skb); |
731 | tipc_bearer_send(net, link->bearer_id, skb, addr); | |
732 | link->rcv_unacked = 0; | |
733 | seqno++; | |
734 | continue; | |
735 | } | |
dd3f9e70 JPM |
736 | if (tipc_msg_bundle(skb_peek_tail(backlogq), msg, mtu)) { |
737 | kfree_skb(__skb_dequeue(list)); | |
4f1688b2 | 738 | link->stats.sent_bundled++; |
4f1688b2 | 739 | continue; |
05dcc5aa | 740 | } |
dd3f9e70 JPM |
741 | if (tipc_msg_make_bundle(&bskb, msg, mtu, link->addr)) { |
742 | kfree_skb(__skb_dequeue(list)); | |
743 | __skb_queue_tail(backlogq, bskb); | |
744 | link->backlog[msg_importance(buf_msg(bskb))].len++; | |
4f1688b2 JPM |
745 | link->stats.sent_bundled++; |
746 | link->stats.sent_bundles++; | |
dd3f9e70 | 747 | continue; |
4f1688b2 | 748 | } |
dd3f9e70 JPM |
749 | link->backlog[imp].len += skb_queue_len(list); |
750 | skb_queue_splice_tail_init(list, backlogq); | |
4f1688b2 | 751 | } |
a97b9d3f | 752 | link->snd_nxt = seqno; |
4f1688b2 JPM |
753 | return 0; |
754 | } | |
755 | ||
af9b028e JPM |
756 | /** |
757 | * tipc_link_xmit(): enqueue buffer list according to queue situation | |
758 | * @link: link to use | |
759 | * @list: chain of buffers containing message | |
760 | * @xmitq: returned list of packets to be sent by caller | |
761 | * | |
762 | * Consumes the buffer chain, except when returning -ELINKCONG, | |
763 | * since the caller then may want to make more send attempts. | |
764 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS | |
765 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
766 | */ | |
767 | int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, | |
768 | struct sk_buff_head *xmitq) | |
769 | { | |
770 | struct tipc_msg *hdr = buf_msg(skb_peek(list)); | |
771 | unsigned int maxwin = l->window; | |
772 | unsigned int i, imp = msg_importance(hdr); | |
773 | unsigned int mtu = l->mtu; | |
774 | u16 ack = l->rcv_nxt - 1; | |
775 | u16 seqno = l->snd_nxt; | |
776 | u16 bc_last_in = l->owner->bclink.last_in; | |
777 | struct sk_buff_head *transmq = &l->transmq; | |
778 | struct sk_buff_head *backlogq = &l->backlogq; | |
779 | struct sk_buff *skb, *_skb, *bskb; | |
780 | ||
781 | /* Match msg importance against this and all higher backlog limits: */ | |
782 | for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) { | |
783 | if (unlikely(l->backlog[i].len >= l->backlog[i].limit)) | |
784 | return link_schedule_user(l, list); | |
785 | } | |
786 | if (unlikely(msg_size(hdr) > mtu)) | |
787 | return -EMSGSIZE; | |
788 | ||
789 | /* Prepare each packet for sending, and add to relevant queue: */ | |
790 | while (skb_queue_len(list)) { | |
791 | skb = skb_peek(list); | |
792 | hdr = buf_msg(skb); | |
793 | msg_set_seqno(hdr, seqno); | |
794 | msg_set_ack(hdr, ack); | |
795 | msg_set_bcast_ack(hdr, bc_last_in); | |
796 | ||
797 | if (likely(skb_queue_len(transmq) < maxwin)) { | |
798 | _skb = skb_clone(skb, GFP_ATOMIC); | |
799 | if (!_skb) | |
800 | return -ENOBUFS; | |
801 | __skb_dequeue(list); | |
802 | __skb_queue_tail(transmq, skb); | |
803 | __skb_queue_tail(xmitq, _skb); | |
804 | l->rcv_unacked = 0; | |
805 | seqno++; | |
806 | continue; | |
807 | } | |
808 | if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) { | |
809 | kfree_skb(__skb_dequeue(list)); | |
810 | l->stats.sent_bundled++; | |
811 | continue; | |
812 | } | |
813 | if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) { | |
814 | kfree_skb(__skb_dequeue(list)); | |
815 | __skb_queue_tail(backlogq, bskb); | |
816 | l->backlog[msg_importance(buf_msg(bskb))].len++; | |
817 | l->stats.sent_bundled++; | |
818 | l->stats.sent_bundles++; | |
819 | continue; | |
820 | } | |
821 | l->backlog[imp].len += skb_queue_len(list); | |
822 | skb_queue_splice_tail_init(list, backlogq); | |
823 | } | |
824 | l->snd_nxt = seqno; | |
825 | return 0; | |
826 | } | |
827 | ||
a6ca1094 YX |
828 | static void skb2list(struct sk_buff *skb, struct sk_buff_head *list) |
829 | { | |
c637c103 | 830 | skb_queue_head_init(list); |
a6ca1094 YX |
831 | __skb_queue_tail(list, skb); |
832 | } | |
833 | ||
834 | static int __tipc_link_xmit_skb(struct tipc_link *link, struct sk_buff *skb) | |
835 | { | |
836 | struct sk_buff_head head; | |
837 | ||
838 | skb2list(skb, &head); | |
7f9f95d9 | 839 | return __tipc_link_xmit(link->owner->net, link, &head); |
a6ca1094 YX |
840 | } |
841 | ||
c64f7a6a | 842 | /* |
247f0f3c | 843 | * tipc_link_sync_xmit - synchronize broadcast link endpoints. |
c64f7a6a JM |
844 | * |
845 | * Give a newly added peer node the sequence number where it should | |
846 | * start receiving and acking broadcast packets. | |
847 | * | |
848 | * Called with node locked | |
849 | */ | |
25b660c7 | 850 | static void tipc_link_sync_xmit(struct tipc_link *link) |
c64f7a6a | 851 | { |
a6ca1094 | 852 | struct sk_buff *skb; |
c64f7a6a JM |
853 | struct tipc_msg *msg; |
854 | ||
a6ca1094 YX |
855 | skb = tipc_buf_acquire(INT_H_SIZE); |
856 | if (!skb) | |
c64f7a6a JM |
857 | return; |
858 | ||
a6ca1094 | 859 | msg = buf_msg(skb); |
c5898636 | 860 | tipc_msg_init(link_own_addr(link), msg, BCAST_PROTOCOL, STATE_MSG, |
34747539 | 861 | INT_H_SIZE, link->addr); |
25b660c7 | 862 | msg_set_last_bcast(msg, link->owner->bclink.acked); |
a6ca1094 | 863 | __tipc_link_xmit_skb(link, skb); |
c64f7a6a JM |
864 | } |
865 | ||
866 | /* | |
247f0f3c | 867 | * tipc_link_sync_rcv - synchronize broadcast link endpoints. |
c64f7a6a JM |
868 | * Receive the sequence number where we should start receiving and |
869 | * acking broadcast packets from a newly added peer node, and open | |
870 | * up for reception of such packets. | |
871 | * | |
872 | * Called with node locked | |
873 | */ | |
247f0f3c | 874 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf) |
c64f7a6a JM |
875 | { |
876 | struct tipc_msg *msg = buf_msg(buf); | |
877 | ||
878 | n->bclink.last_sent = n->bclink.last_in = msg_last_bcast(msg); | |
879 | n->bclink.recv_permitted = true; | |
880 | kfree_skb(buf); | |
881 | } | |
882 | ||
c4307285 | 883 | /* |
47b4c9a8 YX |
884 | * tipc_link_push_packets - push unsent packets to bearer |
885 | * | |
886 | * Push out the unsent messages of a link where congestion | |
887 | * has abated. Node is locked. | |
888 | * | |
889 | * Called with node locked | |
b97bf3fd | 890 | */ |
05dcc5aa | 891 | void tipc_link_push_packets(struct tipc_link *link) |
b97bf3fd | 892 | { |
05dcc5aa | 893 | struct sk_buff *skb; |
47b4c9a8 | 894 | struct tipc_msg *msg; |
dd3f9e70 | 895 | u16 seqno = link->snd_nxt; |
a97b9d3f | 896 | u16 ack = mod(link->rcv_nxt - 1); |
b97bf3fd | 897 | |
05dcc5aa JPM |
898 | while (skb_queue_len(&link->transmq) < link->window) { |
899 | skb = __skb_dequeue(&link->backlogq); | |
900 | if (!skb) | |
47b4c9a8 | 901 | break; |
05dcc5aa | 902 | msg = buf_msg(skb); |
1f66d161 | 903 | link->backlog[msg_importance(msg)].len--; |
05dcc5aa | 904 | msg_set_ack(msg, ack); |
dd3f9e70 JPM |
905 | msg_set_seqno(msg, seqno); |
906 | seqno = mod(seqno + 1); | |
05dcc5aa JPM |
907 | msg_set_bcast_ack(msg, link->owner->bclink.last_in); |
908 | link->rcv_unacked = 0; | |
909 | __skb_queue_tail(&link->transmq, skb); | |
910 | tipc_bearer_send(link->owner->net, link->bearer_id, | |
911 | skb, &link->media_addr); | |
b97bf3fd | 912 | } |
dd3f9e70 | 913 | link->snd_nxt = seqno; |
b97bf3fd PL |
914 | } |
915 | ||
3f5a12bd | 916 | void tipc_link_reset_all(struct tipc_node *node) |
d356eeba | 917 | { |
d356eeba AS |
918 | char addr_string[16]; |
919 | u32 i; | |
920 | ||
3f5a12bd | 921 | tipc_node_lock(node); |
d356eeba | 922 | |
2cf8aa19 | 923 | pr_warn("Resetting all links to %s\n", |
3f5a12bd | 924 | tipc_addr_string_fill(addr_string, node->addr)); |
d356eeba AS |
925 | |
926 | for (i = 0; i < MAX_BEARERS; i++) { | |
9d13ec65 JPM |
927 | if (node->links[i].link) { |
928 | link_print(node->links[i].link, "Resetting link\n"); | |
929 | tipc_link_reset(node->links[i].link); | |
d356eeba AS |
930 | } |
931 | } | |
932 | ||
3f5a12bd | 933 | tipc_node_unlock(node); |
d356eeba AS |
934 | } |
935 | ||
a18c4bc3 | 936 | static void link_retransmit_failure(struct tipc_link *l_ptr, |
ae8509c4 | 937 | struct sk_buff *buf) |
d356eeba AS |
938 | { |
939 | struct tipc_msg *msg = buf_msg(buf); | |
1da46568 | 940 | struct net *net = l_ptr->owner->net; |
d356eeba | 941 | |
2cf8aa19 | 942 | pr_warn("Retransmission failure on link <%s>\n", l_ptr->name); |
d356eeba AS |
943 | |
944 | if (l_ptr->addr) { | |
d356eeba | 945 | /* Handle failure on standard link */ |
8d64a5ba | 946 | link_print(l_ptr, "Resetting link\n"); |
d356eeba AS |
947 | tipc_link_reset(l_ptr); |
948 | ||
949 | } else { | |
d356eeba | 950 | /* Handle failure on broadcast link */ |
6c00055a | 951 | struct tipc_node *n_ptr; |
d356eeba AS |
952 | char addr_string[16]; |
953 | ||
2cf8aa19 EH |
954 | pr_info("Msg seq number: %u, ", msg_seqno(msg)); |
955 | pr_cont("Outstanding acks: %lu\n", | |
956 | (unsigned long) TIPC_SKB_CB(buf)->handle); | |
617dbeaa | 957 | |
1da46568 | 958 | n_ptr = tipc_bclink_retransmit_to(net); |
d356eeba | 959 | |
c68ca7b7 | 960 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
2cf8aa19 | 961 | pr_info("Broadcast link info for %s\n", addr_string); |
389dd9bc YX |
962 | pr_info("Reception permitted: %d, Acked: %u\n", |
963 | n_ptr->bclink.recv_permitted, | |
2cf8aa19 EH |
964 | n_ptr->bclink.acked); |
965 | pr_info("Last in: %u, Oos state: %u, Last sent: %u\n", | |
966 | n_ptr->bclink.last_in, | |
967 | n_ptr->bclink.oos_state, | |
968 | n_ptr->bclink.last_sent); | |
d356eeba | 969 | |
b952b2be | 970 | n_ptr->action_flags |= TIPC_BCAST_RESET; |
d356eeba AS |
971 | l_ptr->stale_count = 0; |
972 | } | |
973 | } | |
974 | ||
58dc55f2 | 975 | void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb, |
4323add6 | 976 | u32 retransmits) |
b97bf3fd PL |
977 | { |
978 | struct tipc_msg *msg; | |
979 | ||
58dc55f2 | 980 | if (!skb) |
d356eeba AS |
981 | return; |
982 | ||
58dc55f2 | 983 | msg = buf_msg(skb); |
c4307285 | 984 | |
512137ee | 985 | /* Detect repeated retransmit failures */ |
a97b9d3f | 986 | if (l_ptr->last_retransm == msg_seqno(msg)) { |
512137ee | 987 | if (++l_ptr->stale_count > 100) { |
58dc55f2 | 988 | link_retransmit_failure(l_ptr, skb); |
512137ee | 989 | return; |
d356eeba AS |
990 | } |
991 | } else { | |
a97b9d3f | 992 | l_ptr->last_retransm = msg_seqno(msg); |
512137ee | 993 | l_ptr->stale_count = 1; |
b97bf3fd | 994 | } |
d356eeba | 995 | |
05dcc5aa JPM |
996 | skb_queue_walk_from(&l_ptr->transmq, skb) { |
997 | if (!retransmits) | |
58dc55f2 YX |
998 | break; |
999 | msg = buf_msg(skb); | |
a97b9d3f | 1000 | msg_set_ack(msg, mod(l_ptr->rcv_nxt - 1)); |
c4307285 | 1001 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
7f9f95d9 YX |
1002 | tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, skb, |
1003 | &l_ptr->media_addr); | |
3c294cb3 YX |
1004 | retransmits--; |
1005 | l_ptr->stats.retransmitted++; | |
b97bf3fd | 1006 | } |
b97bf3fd PL |
1007 | } |
1008 | ||
8b4ed863 JPM |
1009 | /* link_synch(): check if all packets arrived before the synch |
1010 | * point have been consumed | |
1011 | * Returns true if the parallel links are synched, otherwise false | |
1012 | */ | |
1013 | static bool link_synch(struct tipc_link *l) | |
1014 | { | |
1015 | unsigned int post_synch; | |
1016 | struct tipc_link *pl; | |
1017 | ||
1018 | pl = tipc_parallel_link(l); | |
1019 | if (pl == l) | |
1020 | goto synched; | |
1021 | ||
1022 | /* Was last pre-synch packet added to input queue ? */ | |
a97b9d3f | 1023 | if (less_eq(pl->rcv_nxt, l->synch_point)) |
8b4ed863 JPM |
1024 | return false; |
1025 | ||
1026 | /* Is it still in the input queue ? */ | |
a97b9d3f | 1027 | post_synch = mod(pl->rcv_nxt - l->synch_point) - 1; |
d39bbd44 | 1028 | if (skb_queue_len(pl->inputq) > post_synch) |
8b4ed863 JPM |
1029 | return false; |
1030 | synched: | |
d3504c34 | 1031 | l->exec_mode = TIPC_LINK_OPEN; |
8b4ed863 JPM |
1032 | return true; |
1033 | } | |
1034 | ||
f03273f1 YX |
1035 | static void link_retrieve_defq(struct tipc_link *link, |
1036 | struct sk_buff_head *list) | |
b97bf3fd | 1037 | { |
e4bf4f76 | 1038 | u16 seq_no; |
b97bf3fd | 1039 | |
05dcc5aa | 1040 | if (skb_queue_empty(&link->deferdq)) |
f03273f1 YX |
1041 | return; |
1042 | ||
05dcc5aa | 1043 | seq_no = buf_seqno(skb_peek(&link->deferdq)); |
a97b9d3f | 1044 | if (seq_no == link->rcv_nxt) |
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; | |
e4bf4f76 JPM |
1065 | u16 seq_no; |
1066 | u16 ackd; | |
f03273f1 | 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; |
85035568 | 1095 | |
8a0f6ebe | 1096 | tipc_node_lock(n_ptr); |
b4b56102 | 1097 | /* Locate unicast link endpoint that should handle message */ |
9d13ec65 | 1098 | l_ptr = n_ptr->links[b_ptr->identity].link; |
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 */ |
6ab30f9c | 1138 | if (unlikely(!link_working(l_ptr))) { |
3af390e2 | 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 */ | |
d3504c34 | 1147 | link_state_event(l_ptr, TRAFFIC_EVT); |
3af390e2 | 1148 | |
6ab30f9c | 1149 | if (link_working(l_ptr)) { |
3af390e2 | 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 | ||
6ab30f9c | 1158 | /* Link is now in state TIPC_LINK_WORKING */ |
a97b9d3f | 1159 | if (unlikely(seq_no != l_ptr->rcv_nxt)) { |
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 | } |
cd4eee3c JPM |
1165 | l_ptr->silent_intv_cnt = 0; |
1166 | ||
8b4ed863 | 1167 | /* Synchronize with parallel link if applicable */ |
d3504c34 JPM |
1168 | if (unlikely((l_ptr->exec_mode == TIPC_LINK_TUNNEL) && |
1169 | !msg_dup(msg))) { | |
0d699f28 JPM |
1170 | if (!link_synch(l_ptr)) |
1171 | goto unlock; | |
8b4ed863 | 1172 | } |
a97b9d3f | 1173 | l_ptr->rcv_nxt++; |
05dcc5aa | 1174 | if (unlikely(!skb_queue_empty(&l_ptr->deferdq))) |
f03273f1 | 1175 | link_retrieve_defq(l_ptr, &head); |
05dcc5aa | 1176 | if (unlikely(++l_ptr->rcv_unacked >= TIPC_MIN_LINK_WIN)) { |
3f53bd8f | 1177 | l_ptr->stats.sent_acks++; |
ed193ece | 1178 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0); |
3f53bd8f | 1179 | } |
c637c103 JPM |
1180 | tipc_link_input(l_ptr, skb); |
1181 | skb = NULL; | |
1182 | unlock: | |
3af390e2 | 1183 | tipc_node_unlock(n_ptr); |
8a0f6ebe | 1184 | tipc_node_put(n_ptr); |
3af390e2 | 1185 | discard: |
c637c103 JPM |
1186 | if (unlikely(skb)) |
1187 | kfree_skb(skb); | |
b97bf3fd | 1188 | } |
b97bf3fd PL |
1189 | } |
1190 | ||
c637c103 | 1191 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 1192 | * |
c637c103 | 1193 | * Consumes buffer if message is of right type |
7ae934be EH |
1194 | * Node lock must be held |
1195 | */ | |
c637c103 | 1196 | static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb) |
7ae934be | 1197 | { |
c637c103 JPM |
1198 | struct tipc_node *node = link->owner; |
1199 | struct tipc_msg *msg = buf_msg(skb); | |
1200 | u32 dport = msg_destport(msg); | |
7ae934be | 1201 | |
7ae934be | 1202 | switch (msg_user(msg)) { |
c637c103 JPM |
1203 | case TIPC_LOW_IMPORTANCE: |
1204 | case TIPC_MEDIUM_IMPORTANCE: | |
1205 | case TIPC_HIGH_IMPORTANCE: | |
1206 | case TIPC_CRITICAL_IMPORTANCE: | |
1207 | case CONN_MANAGER: | |
d39bbd44 JPM |
1208 | if (tipc_skb_queue_tail(link->inputq, skb, dport)) { |
1209 | node->inputq = link->inputq; | |
c637c103 | 1210 | node->action_flags |= TIPC_MSG_EVT; |
7ae934be | 1211 | } |
c637c103 | 1212 | return true; |
7ae934be | 1213 | case NAME_DISTRIBUTOR: |
c637c103 | 1214 | node->bclink.recv_permitted = true; |
d39bbd44 JPM |
1215 | node->namedq = link->namedq; |
1216 | skb_queue_tail(link->namedq, skb); | |
1217 | if (skb_queue_len(link->namedq) == 1) | |
c637c103 JPM |
1218 | node->action_flags |= TIPC_NAMED_MSG_EVT; |
1219 | return true; | |
1220 | case MSG_BUNDLER: | |
dff29b1a | 1221 | case TUNNEL_PROTOCOL: |
c637c103 | 1222 | case MSG_FRAGMENTER: |
7ae934be | 1223 | case BCAST_PROTOCOL: |
c637c103 | 1224 | return false; |
7ae934be | 1225 | default: |
c637c103 JPM |
1226 | pr_warn("Dropping received illegal msg type\n"); |
1227 | kfree_skb(skb); | |
1228 | return false; | |
1229 | }; | |
7ae934be | 1230 | } |
c637c103 JPM |
1231 | |
1232 | /* tipc_link_input - process packet that has passed link protocol check | |
1233 | * | |
1234 | * Consumes buffer | |
1235 | * Node lock must be held | |
7ae934be | 1236 | */ |
c637c103 | 1237 | static void tipc_link_input(struct tipc_link *link, struct sk_buff *skb) |
7ae934be | 1238 | { |
c637c103 JPM |
1239 | struct tipc_node *node = link->owner; |
1240 | struct tipc_msg *msg = buf_msg(skb); | |
1241 | struct sk_buff *iskb; | |
1242 | int pos = 0; | |
1243 | ||
1244 | if (likely(tipc_data_input(link, skb))) | |
1245 | return; | |
7ae934be EH |
1246 | |
1247 | switch (msg_user(msg)) { | |
dff29b1a | 1248 | case TUNNEL_PROTOCOL: |
8b4ed863 | 1249 | if (msg_dup(msg)) { |
d3504c34 | 1250 | link->exec_mode = TIPC_LINK_TUNNEL; |
8b4ed863 | 1251 | link->synch_point = msg_seqno(msg_get_wrapped(msg)); |
2da71425 JPM |
1252 | kfree_skb(skb); |
1253 | break; | |
8b4ed863 | 1254 | } |
dff29b1a | 1255 | if (!tipc_link_failover_rcv(link, &skb)) |
c637c103 JPM |
1256 | break; |
1257 | if (msg_user(buf_msg(skb)) != MSG_BUNDLER) { | |
1258 | tipc_data_input(link, skb); | |
1259 | break; | |
1260 | } | |
1261 | case MSG_BUNDLER: | |
1262 | link->stats.recv_bundles++; | |
1263 | link->stats.recv_bundled += msg_msgcnt(msg); | |
1264 | ||
1265 | while (tipc_msg_extract(skb, &iskb, &pos)) | |
1266 | tipc_data_input(link, iskb); | |
7ae934be | 1267 | break; |
c637c103 JPM |
1268 | case MSG_FRAGMENTER: |
1269 | link->stats.recv_fragments++; | |
1270 | if (tipc_buf_append(&link->reasm_buf, &skb)) { | |
1271 | link->stats.recv_fragmented++; | |
1272 | tipc_data_input(link, skb); | |
1273 | } else if (!link->reasm_buf) { | |
1274 | tipc_link_reset(link); | |
1275 | } | |
7ae934be | 1276 | break; |
c637c103 JPM |
1277 | case BCAST_PROTOCOL: |
1278 | tipc_link_sync_rcv(node, skb); | |
7ae934be EH |
1279 | break; |
1280 | default: | |
c637c103 JPM |
1281 | break; |
1282 | }; | |
7ae934be EH |
1283 | } |
1284 | ||
2c53040f | 1285 | /** |
8809b255 AS |
1286 | * tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue |
1287 | * | |
1288 | * Returns increase in queue length (i.e. 0 or 1) | |
b97bf3fd | 1289 | */ |
bc6fecd4 | 1290 | u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb) |
b97bf3fd | 1291 | { |
bc6fecd4 | 1292 | struct sk_buff *skb1; |
e4bf4f76 | 1293 | u16 seq_no = buf_seqno(skb); |
b97bf3fd PL |
1294 | |
1295 | /* Empty queue ? */ | |
bc6fecd4 YX |
1296 | if (skb_queue_empty(list)) { |
1297 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1298 | return 1; |
1299 | } | |
1300 | ||
1301 | /* Last ? */ | |
bc6fecd4 YX |
1302 | if (less(buf_seqno(skb_peek_tail(list)), seq_no)) { |
1303 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1304 | return 1; |
1305 | } | |
1306 | ||
8809b255 | 1307 | /* Locate insertion point in queue, then insert; discard if duplicate */ |
bc6fecd4 | 1308 | skb_queue_walk(list, skb1) { |
e4bf4f76 | 1309 | u16 curr_seqno = buf_seqno(skb1); |
b97bf3fd | 1310 | |
8809b255 | 1311 | if (seq_no == curr_seqno) { |
bc6fecd4 | 1312 | kfree_skb(skb); |
8809b255 | 1313 | return 0; |
b97bf3fd | 1314 | } |
8809b255 AS |
1315 | |
1316 | if (less(seq_no, curr_seqno)) | |
b97bf3fd | 1317 | break; |
8809b255 | 1318 | } |
b97bf3fd | 1319 | |
bc6fecd4 | 1320 | __skb_queue_before(list, skb1, skb); |
8809b255 | 1321 | return 1; |
b97bf3fd PL |
1322 | } |
1323 | ||
8809b255 | 1324 | /* |
b97bf3fd PL |
1325 | * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet |
1326 | */ | |
c5898636 | 1327 | static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr, |
b97bf3fd PL |
1328 | struct sk_buff *buf) |
1329 | { | |
f905730c | 1330 | u32 seq_no = buf_seqno(buf); |
b97bf3fd PL |
1331 | |
1332 | if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) { | |
c5898636 | 1333 | tipc_link_proto_rcv(l_ptr, buf); |
b97bf3fd PL |
1334 | return; |
1335 | } | |
1336 | ||
cd4eee3c JPM |
1337 | /* Record OOS packet arrival */ |
1338 | l_ptr->silent_intv_cnt = 0; | |
b97bf3fd | 1339 | |
c4307285 | 1340 | /* |
b97bf3fd PL |
1341 | * Discard packet if a duplicate; otherwise add it to deferred queue |
1342 | * and notify peer of gap as per protocol specification | |
1343 | */ | |
a97b9d3f | 1344 | if (less(seq_no, l_ptr->rcv_nxt)) { |
b97bf3fd | 1345 | l_ptr->stats.duplicates++; |
5f6d9123 | 1346 | kfree_skb(buf); |
b97bf3fd PL |
1347 | return; |
1348 | } | |
1349 | ||
05dcc5aa | 1350 | if (tipc_link_defer_pkt(&l_ptr->deferdq, buf)) { |
b97bf3fd | 1351 | l_ptr->stats.deferred_recv++; |
05dcc5aa | 1352 | if ((skb_queue_len(&l_ptr->deferdq) % TIPC_MIN_LINK_WIN) == 1) |
ed193ece | 1353 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0); |
bc6fecd4 | 1354 | } else { |
b97bf3fd | 1355 | l_ptr->stats.duplicates++; |
bc6fecd4 | 1356 | } |
b97bf3fd PL |
1357 | } |
1358 | ||
1359 | /* | |
1360 | * Send protocol message to the other endpoint. | |
1361 | */ | |
426cc2b8 | 1362 | void tipc_link_proto_xmit(struct tipc_link *l, u32 msg_typ, int probe_msg, |
ed193ece | 1363 | u32 gap, u32 tolerance, u32 priority) |
b97bf3fd | 1364 | { |
426cc2b8 JPM |
1365 | struct sk_buff *skb = NULL; |
1366 | struct sk_buff_head xmitq; | |
b97bf3fd | 1367 | |
426cc2b8 JPM |
1368 | __skb_queue_head_init(&xmitq); |
1369 | tipc_link_build_proto_msg(l, msg_typ, probe_msg, gap, | |
1370 | tolerance, priority, &xmitq); | |
1371 | skb = __skb_dequeue(&xmitq); | |
1372 | if (!skb) | |
b97bf3fd | 1373 | return; |
426cc2b8 JPM |
1374 | tipc_bearer_send(l->owner->net, l->bearer_id, skb, &l->media_addr); |
1375 | l->rcv_unacked = 0; | |
1376 | kfree_skb(skb); | |
b97bf3fd PL |
1377 | } |
1378 | ||
1379 | /* | |
1380 | * Receive protocol message : | |
c4307285 YH |
1381 | * Note that network plane id propagates through the network, and may |
1382 | * change at any time. The node with lowest address rules | |
b97bf3fd | 1383 | */ |
c5898636 | 1384 | static void tipc_link_proto_rcv(struct tipc_link *l_ptr, |
c93d3baa | 1385 | struct sk_buff *buf) |
b97bf3fd PL |
1386 | { |
1387 | u32 rec_gap = 0; | |
b97bf3fd PL |
1388 | u32 msg_tol; |
1389 | struct tipc_msg *msg = buf_msg(buf); | |
1390 | ||
d3504c34 | 1391 | if (l_ptr->exec_mode == TIPC_LINK_BLOCKED) |
b97bf3fd PL |
1392 | goto exit; |
1393 | ||
7a2f7d18 | 1394 | if (l_ptr->net_plane != msg_net_plane(msg)) |
c5898636 | 1395 | if (link_own_addr(l_ptr) > msg_prevnode(msg)) |
7a2f7d18 | 1396 | l_ptr->net_plane = msg_net_plane(msg); |
b97bf3fd | 1397 | |
b97bf3fd | 1398 | switch (msg_type(msg)) { |
c4307285 | 1399 | |
b97bf3fd | 1400 | case RESET_MSG: |
6ab30f9c | 1401 | if (!link_probing(l_ptr) && |
d3504c34 | 1402 | (l_ptr->peer_session != WILDCARD_SESSION)) { |
641c218d AS |
1403 | if (less_eq(msg_session(msg), l_ptr->peer_session)) |
1404 | break; /* duplicate or old reset: ignore */ | |
b97bf3fd | 1405 | } |
b4b56102 | 1406 | |
6ab30f9c JPM |
1407 | if (!msg_redundant_link(msg) && (link_working(l_ptr) || |
1408 | link_probing(l_ptr))) { | |
1409 | /* peer has lost contact -- don't allow peer's links | |
b4b56102 AS |
1410 | * to reactivate before we recognize loss & clean up |
1411 | */ | |
ca9cf06a | 1412 | l_ptr->owner->action_flags |= TIPC_WAIT_OWN_LINKS_DOWN; |
b4b56102 AS |
1413 | } |
1414 | ||
47361c87 AS |
1415 | link_state_event(l_ptr, RESET_MSG); |
1416 | ||
b97bf3fd PL |
1417 | /* fall thru' */ |
1418 | case ACTIVATE_MSG: | |
1419 | /* Update link settings according other endpoint's values */ | |
b97bf3fd PL |
1420 | strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg)); |
1421 | ||
2db9983a AS |
1422 | msg_tol = msg_link_tolerance(msg); |
1423 | if (msg_tol > l_ptr->tolerance) | |
b97bf3fd PL |
1424 | link_set_supervision_props(l_ptr, msg_tol); |
1425 | ||
1426 | if (msg_linkprio(msg) > l_ptr->priority) | |
1427 | l_ptr->priority = msg_linkprio(msg); | |
1428 | ||
ed193ece JPM |
1429 | if (l_ptr->mtu > msg_max_pkt(msg)) |
1430 | l_ptr->mtu = msg_max_pkt(msg); | |
b97bf3fd | 1431 | |
4d75313c | 1432 | /* Synchronize broadcast link info, if not done previously */ |
7a54d4a9 AS |
1433 | if (!tipc_node_is_up(l_ptr->owner)) { |
1434 | l_ptr->owner->bclink.last_sent = | |
1435 | l_ptr->owner->bclink.last_in = | |
1436 | msg_last_bcast(msg); | |
1437 | l_ptr->owner->bclink.oos_state = 0; | |
1438 | } | |
4d75313c | 1439 | |
b97bf3fd PL |
1440 | l_ptr->peer_session = msg_session(msg); |
1441 | l_ptr->peer_bearer_id = msg_bearer_id(msg); | |
47361c87 AS |
1442 | |
1443 | if (msg_type(msg) == ACTIVATE_MSG) | |
1444 | link_state_event(l_ptr, ACTIVATE_MSG); | |
b97bf3fd PL |
1445 | break; |
1446 | case STATE_MSG: | |
1447 | ||
2db9983a AS |
1448 | msg_tol = msg_link_tolerance(msg); |
1449 | if (msg_tol) | |
b97bf3fd | 1450 | link_set_supervision_props(l_ptr, msg_tol); |
c4307285 YH |
1451 | |
1452 | if (msg_linkprio(msg) && | |
b97bf3fd | 1453 | (msg_linkprio(msg) != l_ptr->priority)) { |
3fa9cacd EH |
1454 | pr_debug("%s<%s>, priority change %u->%u\n", |
1455 | link_rst_msg, l_ptr->name, | |
1456 | l_ptr->priority, msg_linkprio(msg)); | |
b97bf3fd | 1457 | l_ptr->priority = msg_linkprio(msg); |
4323add6 | 1458 | tipc_link_reset(l_ptr); /* Enforce change to take effect */ |
b97bf3fd PL |
1459 | break; |
1460 | } | |
ec37dcd3 JPM |
1461 | |
1462 | /* Record reception; force mismatch at next timeout: */ | |
cd4eee3c | 1463 | l_ptr->silent_intv_cnt = 0; |
ec37dcd3 | 1464 | |
d3504c34 | 1465 | link_state_event(l_ptr, TRAFFIC_EVT); |
b97bf3fd | 1466 | l_ptr->stats.recv_states++; |
6ab30f9c | 1467 | if (link_resetting(l_ptr)) |
b97bf3fd PL |
1468 | break; |
1469 | ||
a97b9d3f JPM |
1470 | if (less_eq(l_ptr->rcv_nxt, msg_next_sent(msg))) |
1471 | rec_gap = mod(msg_next_sent(msg) - l_ptr->rcv_nxt); | |
b97bf3fd | 1472 | |
ed193ece | 1473 | if (msg_probe(msg)) |
b97bf3fd | 1474 | l_ptr->stats.recv_probes++; |
b97bf3fd PL |
1475 | |
1476 | /* Protocol message before retransmits, reduce loss risk */ | |
389dd9bc | 1477 | if (l_ptr->owner->bclink.recv_permitted) |
c5898636 | 1478 | tipc_bclink_update_link_state(l_ptr->owner, |
7a54d4a9 | 1479 | msg_last_bcast(msg)); |
b97bf3fd PL |
1480 | |
1481 | if (rec_gap || (msg_probe(msg))) { | |
ed193ece JPM |
1482 | tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, |
1483 | rec_gap, 0, 0); | |
b97bf3fd PL |
1484 | } |
1485 | if (msg_seq_gap(msg)) { | |
b97bf3fd | 1486 | l_ptr->stats.recv_nacks++; |
05dcc5aa | 1487 | tipc_link_retransmit(l_ptr, skb_peek(&l_ptr->transmq), |
4323add6 | 1488 | msg_seq_gap(msg)); |
b97bf3fd PL |
1489 | } |
1490 | break; | |
b97bf3fd PL |
1491 | } |
1492 | exit: | |
5f6d9123 | 1493 | kfree_skb(buf); |
b97bf3fd PL |
1494 | } |
1495 | ||
426cc2b8 JPM |
1496 | /* tipc_link_build_proto_msg: prepare link protocol message for transmission |
1497 | */ | |
1498 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, | |
1499 | u16 rcvgap, int tolerance, int priority, | |
1500 | struct sk_buff_head *xmitq) | |
1501 | { | |
1502 | struct sk_buff *skb = NULL; | |
1503 | struct tipc_msg *hdr = l->pmsg; | |
1504 | u16 snd_nxt = l->snd_nxt; | |
1505 | u16 rcv_nxt = l->rcv_nxt; | |
1506 | u16 rcv_last = rcv_nxt - 1; | |
1507 | int node_up = l->owner->bclink.recv_permitted; | |
1508 | ||
1509 | /* Don't send protocol message during reset or link failover */ | |
1510 | if (l->exec_mode == TIPC_LINK_BLOCKED) | |
1511 | return; | |
1512 | ||
1513 | /* Abort non-RESET send if communication with node is prohibited */ | |
1514 | if ((tipc_node_blocked(l->owner)) && (mtyp != RESET_MSG)) | |
1515 | return; | |
1516 | ||
1517 | msg_set_type(hdr, mtyp); | |
1518 | msg_set_net_plane(hdr, l->net_plane); | |
1519 | msg_set_bcast_ack(hdr, l->owner->bclink.last_in); | |
1520 | msg_set_last_bcast(hdr, tipc_bclink_get_last_sent(l->owner->net)); | |
1521 | msg_set_link_tolerance(hdr, tolerance); | |
1522 | msg_set_linkprio(hdr, priority); | |
1523 | msg_set_redundant_link(hdr, node_up); | |
1524 | msg_set_seq_gap(hdr, 0); | |
1525 | ||
1526 | /* Compatibility: created msg must not be in sequence with pkt flow */ | |
1527 | msg_set_seqno(hdr, snd_nxt + U16_MAX / 2); | |
1528 | ||
1529 | if (mtyp == STATE_MSG) { | |
1530 | if (!tipc_link_is_up(l)) | |
1531 | return; | |
1532 | msg_set_next_sent(hdr, snd_nxt); | |
1533 | ||
1534 | /* Override rcvgap if there are packets in deferred queue */ | |
1535 | if (!skb_queue_empty(&l->deferdq)) | |
1536 | rcvgap = buf_seqno(skb_peek(&l->deferdq)) - rcv_nxt; | |
1537 | if (rcvgap) { | |
1538 | msg_set_seq_gap(hdr, rcvgap); | |
1539 | l->stats.sent_nacks++; | |
1540 | } | |
1541 | msg_set_ack(hdr, rcv_last); | |
1542 | msg_set_probe(hdr, probe); | |
1543 | if (probe) | |
1544 | l->stats.sent_probes++; | |
1545 | l->stats.sent_states++; | |
1546 | } else { | |
1547 | /* RESET_MSG or ACTIVATE_MSG */ | |
1548 | msg_set_max_pkt(hdr, l->advertised_mtu); | |
1549 | msg_set_ack(hdr, l->failover_checkpt - 1); | |
1550 | msg_set_next_sent(hdr, 1); | |
1551 | } | |
1552 | skb = tipc_buf_acquire(msg_size(hdr)); | |
1553 | if (!skb) | |
1554 | return; | |
1555 | skb_copy_to_linear_data(skb, hdr, msg_size(hdr)); | |
1556 | skb->priority = TC_PRIO_CONTROL; | |
1557 | __skb_queue_head(xmitq, skb); | |
1558 | } | |
b97bf3fd | 1559 | |
170b3927 JPM |
1560 | /* tipc_link_tunnel_xmit(): Tunnel one packet via a link belonging to |
1561 | * a different bearer. Owner node is locked. | |
b97bf3fd | 1562 | */ |
170b3927 JPM |
1563 | static void tipc_link_tunnel_xmit(struct tipc_link *l_ptr, |
1564 | struct tipc_msg *tunnel_hdr, | |
1565 | struct tipc_msg *msg, | |
1566 | u32 selector) | |
b97bf3fd | 1567 | { |
a18c4bc3 | 1568 | struct tipc_link *tunnel; |
a6ca1094 | 1569 | struct sk_buff *skb; |
b97bf3fd PL |
1570 | u32 length = msg_size(msg); |
1571 | ||
9d13ec65 | 1572 | tunnel = node_active_link(l_ptr->owner, selector & 1); |
5392d646 | 1573 | if (!tipc_link_is_up(tunnel)) { |
2cf8aa19 | 1574 | pr_warn("%stunnel link no longer available\n", link_co_err); |
b97bf3fd | 1575 | return; |
5392d646 | 1576 | } |
b97bf3fd | 1577 | msg_set_size(tunnel_hdr, length + INT_H_SIZE); |
a6ca1094 YX |
1578 | skb = tipc_buf_acquire(length + INT_H_SIZE); |
1579 | if (!skb) { | |
2cf8aa19 | 1580 | pr_warn("%sunable to send tunnel msg\n", link_co_err); |
b97bf3fd | 1581 | return; |
5392d646 | 1582 | } |
a6ca1094 YX |
1583 | skb_copy_to_linear_data(skb, tunnel_hdr, INT_H_SIZE); |
1584 | skb_copy_to_linear_data_offset(skb, INT_H_SIZE, msg, length); | |
1585 | __tipc_link_xmit_skb(tunnel, skb); | |
b97bf3fd PL |
1586 | } |
1587 | ||
1588 | ||
170b3927 JPM |
1589 | /* tipc_link_failover_send_queue(): A link has gone down, but a second |
1590 | * link is still active. We can do failover. Tunnel the failing link's | |
1591 | * whole send queue via the remaining link. This way, we don't lose | |
1592 | * any packets, and sequence order is preserved for subsequent traffic | |
1593 | * sent over the remaining link. Owner node is locked. | |
b97bf3fd | 1594 | */ |
170b3927 | 1595 | void tipc_link_failover_send_queue(struct tipc_link *l_ptr) |
b97bf3fd | 1596 | { |
05dcc5aa | 1597 | int msgcount; |
9d13ec65 | 1598 | struct tipc_link *tunnel = node_active_link(l_ptr->owner, 0); |
b97bf3fd | 1599 | struct tipc_msg tunnel_hdr; |
58dc55f2 | 1600 | struct sk_buff *skb; |
5392d646 | 1601 | int split_bundles; |
b97bf3fd PL |
1602 | |
1603 | if (!tunnel) | |
1604 | return; | |
1605 | ||
dff29b1a JPM |
1606 | tipc_msg_init(link_own_addr(l_ptr), &tunnel_hdr, TUNNEL_PROTOCOL, |
1607 | FAILOVER_MSG, INT_H_SIZE, l_ptr->addr); | |
dd3f9e70 JPM |
1608 | |
1609 | skb_queue_walk(&l_ptr->backlogq, skb) { | |
1610 | msg_set_seqno(buf_msg(skb), l_ptr->snd_nxt); | |
1611 | l_ptr->snd_nxt = mod(l_ptr->snd_nxt + 1); | |
1612 | } | |
05dcc5aa | 1613 | skb_queue_splice_tail_init(&l_ptr->backlogq, &l_ptr->transmq); |
1f66d161 | 1614 | tipc_link_purge_backlog(l_ptr); |
05dcc5aa | 1615 | msgcount = skb_queue_len(&l_ptr->transmq); |
b97bf3fd PL |
1616 | msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id); |
1617 | msg_set_msgcnt(&tunnel_hdr, msgcount); | |
f131072c | 1618 | |
05dcc5aa | 1619 | if (skb_queue_empty(&l_ptr->transmq)) { |
58dc55f2 YX |
1620 | skb = tipc_buf_acquire(INT_H_SIZE); |
1621 | if (skb) { | |
1622 | skb_copy_to_linear_data(skb, &tunnel_hdr, INT_H_SIZE); | |
b97bf3fd | 1623 | msg_set_size(&tunnel_hdr, INT_H_SIZE); |
a6ca1094 | 1624 | __tipc_link_xmit_skb(tunnel, skb); |
b97bf3fd | 1625 | } else { |
2cf8aa19 EH |
1626 | pr_warn("%sunable to send changeover msg\n", |
1627 | link_co_err); | |
b97bf3fd PL |
1628 | } |
1629 | return; | |
1630 | } | |
f131072c | 1631 | |
9d13ec65 JPM |
1632 | split_bundles = (node_active_link(l_ptr->owner, 0) != |
1633 | node_active_link(l_ptr->owner, 0)); | |
5392d646 | 1634 | |
05dcc5aa | 1635 | skb_queue_walk(&l_ptr->transmq, skb) { |
58dc55f2 | 1636 | struct tipc_msg *msg = buf_msg(skb); |
b97bf3fd PL |
1637 | |
1638 | if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) { | |
b97bf3fd | 1639 | struct tipc_msg *m = msg_get_wrapped(msg); |
0e65967e | 1640 | unchar *pos = (unchar *)m; |
b97bf3fd | 1641 | |
d788d805 | 1642 | msgcount = msg_msgcnt(msg); |
b97bf3fd | 1643 | while (msgcount--) { |
0e65967e | 1644 | msg_set_seqno(m, msg_seqno(msg)); |
170b3927 JPM |
1645 | tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, m, |
1646 | msg_link_selector(m)); | |
b97bf3fd PL |
1647 | pos += align(msg_size(m)); |
1648 | m = (struct tipc_msg *)pos; | |
1649 | } | |
1650 | } else { | |
170b3927 JPM |
1651 | tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, msg, |
1652 | msg_link_selector(msg)); | |
b97bf3fd | 1653 | } |
b97bf3fd PL |
1654 | } |
1655 | } | |
1656 | ||
247f0f3c | 1657 | /* tipc_link_dup_queue_xmit(): A second link has become active. Tunnel a |
170b3927 JPM |
1658 | * duplicate of the first link's send queue via the new link. This way, we |
1659 | * are guaranteed that currently queued packets from a socket are delivered | |
1660 | * before future traffic from the same socket, even if this is using the | |
1661 | * new link. The last arriving copy of each duplicate packet is dropped at | |
1662 | * the receiving end by the regular protocol check, so packet cardinality | |
1663 | * and sequence order is preserved per sender/receiver socket pair. | |
1664 | * Owner node is locked. | |
1665 | */ | |
05dcc5aa JPM |
1666 | void tipc_link_dup_queue_xmit(struct tipc_link *link, |
1667 | struct tipc_link *tnl) | |
b97bf3fd | 1668 | { |
58dc55f2 | 1669 | struct sk_buff *skb; |
05dcc5aa JPM |
1670 | struct tipc_msg tnl_hdr; |
1671 | struct sk_buff_head *queue = &link->transmq; | |
1672 | int mcnt; | |
dd3f9e70 | 1673 | u16 seqno; |
05dcc5aa | 1674 | |
dff29b1a JPM |
1675 | tipc_msg_init(link_own_addr(link), &tnl_hdr, TUNNEL_PROTOCOL, |
1676 | SYNCH_MSG, INT_H_SIZE, link->addr); | |
05dcc5aa JPM |
1677 | mcnt = skb_queue_len(&link->transmq) + skb_queue_len(&link->backlogq); |
1678 | msg_set_msgcnt(&tnl_hdr, mcnt); | |
1679 | msg_set_bearer_id(&tnl_hdr, link->peer_bearer_id); | |
1680 | ||
1681 | tunnel_queue: | |
1682 | skb_queue_walk(queue, skb) { | |
58dc55f2 YX |
1683 | struct sk_buff *outskb; |
1684 | struct tipc_msg *msg = buf_msg(skb); | |
05dcc5aa | 1685 | u32 len = msg_size(msg); |
b97bf3fd | 1686 | |
a97b9d3f | 1687 | msg_set_ack(msg, mod(link->rcv_nxt - 1)); |
05dcc5aa JPM |
1688 | msg_set_bcast_ack(msg, link->owner->bclink.last_in); |
1689 | msg_set_size(&tnl_hdr, len + INT_H_SIZE); | |
1690 | outskb = tipc_buf_acquire(len + INT_H_SIZE); | |
58dc55f2 | 1691 | if (outskb == NULL) { |
2cf8aa19 EH |
1692 | pr_warn("%sunable to send duplicate msg\n", |
1693 | link_co_err); | |
b97bf3fd PL |
1694 | return; |
1695 | } | |
05dcc5aa JPM |
1696 | skb_copy_to_linear_data(outskb, &tnl_hdr, INT_H_SIZE); |
1697 | skb_copy_to_linear_data_offset(outskb, INT_H_SIZE, | |
1698 | skb->data, len); | |
1699 | __tipc_link_xmit_skb(tnl, outskb); | |
1700 | if (!tipc_link_is_up(link)) | |
b97bf3fd | 1701 | return; |
b97bf3fd | 1702 | } |
05dcc5aa JPM |
1703 | if (queue == &link->backlogq) |
1704 | return; | |
dd3f9e70 JPM |
1705 | seqno = link->snd_nxt; |
1706 | skb_queue_walk(&link->backlogq, skb) { | |
1707 | msg_set_seqno(buf_msg(skb), seqno); | |
1708 | seqno = mod(seqno + 1); | |
1709 | } | |
05dcc5aa JPM |
1710 | queue = &link->backlogq; |
1711 | goto tunnel_queue; | |
b97bf3fd PL |
1712 | } |
1713 | ||
dff29b1a | 1714 | /* tipc_link_failover_rcv(): Receive a tunnelled FAILOVER_MSG packet |
f006c9c7 JPM |
1715 | * Owner node is locked. |
1716 | */ | |
dff29b1a | 1717 | static bool tipc_link_failover_rcv(struct tipc_link *link, |
2da71425 | 1718 | struct sk_buff **skb) |
f006c9c7 | 1719 | { |
2da71425 JPM |
1720 | struct tipc_msg *msg = buf_msg(*skb); |
1721 | struct sk_buff *iskb = NULL; | |
dff29b1a | 1722 | struct tipc_link *pl = NULL; |
2da71425 | 1723 | int bearer_id = msg_bearer_id(msg); |
c1336ee4 | 1724 | int pos = 0; |
f006c9c7 | 1725 | |
dff29b1a | 1726 | if (msg_type(msg) != FAILOVER_MSG) { |
2da71425 JPM |
1727 | pr_warn("%sunknown tunnel pkt received\n", link_co_err); |
1728 | goto exit; | |
f006c9c7 | 1729 | } |
2da71425 JPM |
1730 | if (bearer_id >= MAX_BEARERS) |
1731 | goto exit; | |
dff29b1a JPM |
1732 | |
1733 | if (bearer_id == link->bearer_id) | |
2da71425 | 1734 | goto exit; |
b97bf3fd | 1735 | |
9d13ec65 | 1736 | pl = link->owner->links[bearer_id].link; |
dff29b1a JPM |
1737 | if (pl && tipc_link_is_up(pl)) |
1738 | tipc_link_reset(pl); | |
1739 | ||
1740 | if (link->failover_pkts == FIRST_FAILOVER) | |
1741 | link->failover_pkts = msg_msgcnt(msg); | |
1e9d47a9 | 1742 | |
2da71425 | 1743 | /* Should we expect an inner packet? */ |
dff29b1a | 1744 | if (!link->failover_pkts) |
cb4b102f | 1745 | goto exit; |
1dab3d5a | 1746 | |
2da71425 JPM |
1747 | if (!tipc_msg_extract(*skb, &iskb, &pos)) { |
1748 | pr_warn("%sno inner failover pkt\n", link_co_err); | |
1749 | *skb = NULL; | |
b97bf3fd | 1750 | goto exit; |
2da71425 | 1751 | } |
dff29b1a | 1752 | link->failover_pkts--; |
2da71425 | 1753 | *skb = NULL; |
b97bf3fd | 1754 | |
dff29b1a JPM |
1755 | /* Was this packet already delivered? */ |
1756 | if (less(buf_seqno(iskb), link->failover_checkpt)) { | |
2da71425 JPM |
1757 | kfree_skb(iskb); |
1758 | iskb = NULL; | |
1759 | goto exit; | |
1760 | } | |
1761 | if (msg_user(buf_msg(iskb)) == MSG_FRAGMENTER) { | |
1762 | link->stats.recv_fragments++; | |
dff29b1a | 1763 | tipc_buf_append(&link->failover_skb, &iskb); |
2da71425 | 1764 | } |
b97bf3fd | 1765 | exit: |
dff29b1a | 1766 | if (!link->failover_pkts && pl) |
d3504c34 | 1767 | pl->exec_mode = TIPC_LINK_OPEN; |
2da71425 JPM |
1768 | kfree_skb(*skb); |
1769 | *skb = iskb; | |
1770 | return *skb; | |
b97bf3fd PL |
1771 | } |
1772 | ||
2f55c437 | 1773 | static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol) |
b97bf3fd | 1774 | { |
2f55c437 YX |
1775 | unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4; |
1776 | ||
1777 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
5413b4c6 AS |
1778 | return; |
1779 | ||
2f55c437 | 1780 | l_ptr->tolerance = tol; |
a97b9d3f JPM |
1781 | l_ptr->keepalive_intv = msecs_to_jiffies(intv); |
1782 | l_ptr->abort_limit = tol / (jiffies_to_msecs(l_ptr->keepalive_intv)); | |
b97bf3fd PL |
1783 | } |
1784 | ||
e3eea1eb | 1785 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
b97bf3fd | 1786 | { |
ed193ece | 1787 | int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE); |
e3eea1eb JPM |
1788 | |
1789 | l->window = win; | |
1f66d161 JPM |
1790 | l->backlog[TIPC_LOW_IMPORTANCE].limit = win / 2; |
1791 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = win; | |
1792 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = win / 2 * 3; | |
1793 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = win * 2; | |
1794 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; | |
b97bf3fd PL |
1795 | } |
1796 | ||
e099e86c | 1797 | /* tipc_link_find_owner - locate owner node of link by link's name |
f2f9800d | 1798 | * @net: the applicable net namespace |
e099e86c JPM |
1799 | * @name: pointer to link name string |
1800 | * @bearer_id: pointer to index in 'node->links' array where the link was found. | |
c4307285 | 1801 | * |
e099e86c | 1802 | * Returns pointer to node owning the link, or 0 if no matching link is found. |
b97bf3fd | 1803 | */ |
f2f9800d YX |
1804 | static struct tipc_node *tipc_link_find_owner(struct net *net, |
1805 | const char *link_name, | |
e099e86c | 1806 | unsigned int *bearer_id) |
b97bf3fd | 1807 | { |
f2f9800d | 1808 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
a18c4bc3 | 1809 | struct tipc_link *l_ptr; |
bbfbe47c | 1810 | struct tipc_node *n_ptr; |
886eaa1f | 1811 | struct tipc_node *found_node = NULL; |
bbfbe47c | 1812 | int i; |
b97bf3fd | 1813 | |
e099e86c | 1814 | *bearer_id = 0; |
6c7a762e | 1815 | rcu_read_lock(); |
f2f9800d | 1816 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
a11607f5 | 1817 | tipc_node_lock(n_ptr); |
bbfbe47c | 1818 | for (i = 0; i < MAX_BEARERS; i++) { |
9d13ec65 | 1819 | l_ptr = n_ptr->links[i].link; |
e099e86c JPM |
1820 | if (l_ptr && !strcmp(l_ptr->name, link_name)) { |
1821 | *bearer_id = i; | |
1822 | found_node = n_ptr; | |
1823 | break; | |
1824 | } | |
bbfbe47c | 1825 | } |
a11607f5 | 1826 | tipc_node_unlock(n_ptr); |
e099e86c JPM |
1827 | if (found_node) |
1828 | break; | |
bbfbe47c | 1829 | } |
6c7a762e YX |
1830 | rcu_read_unlock(); |
1831 | ||
e099e86c | 1832 | return found_node; |
b97bf3fd PL |
1833 | } |
1834 | ||
b97bf3fd PL |
1835 | /** |
1836 | * link_reset_statistics - reset link statistics | |
1837 | * @l_ptr: pointer to link | |
1838 | */ | |
a18c4bc3 | 1839 | static void link_reset_statistics(struct tipc_link *l_ptr) |
b97bf3fd PL |
1840 | { |
1841 | memset(&l_ptr->stats, 0, sizeof(l_ptr->stats)); | |
a97b9d3f JPM |
1842 | l_ptr->stats.sent_info = l_ptr->snd_nxt; |
1843 | l_ptr->stats.recv_info = l_ptr->rcv_nxt; | |
b97bf3fd PL |
1844 | } |
1845 | ||
a18c4bc3 | 1846 | static void link_print(struct tipc_link *l_ptr, const char *str) |
b97bf3fd | 1847 | { |
7f9f95d9 | 1848 | struct tipc_net *tn = net_generic(l_ptr->owner->net, tipc_net_id); |
7a2f7d18 YX |
1849 | struct tipc_bearer *b_ptr; |
1850 | ||
1851 | rcu_read_lock(); | |
7f9f95d9 | 1852 | b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]); |
7a2f7d18 YX |
1853 | if (b_ptr) |
1854 | pr_info("%s Link %x<%s>:", str, l_ptr->addr, b_ptr->name); | |
1855 | rcu_read_unlock(); | |
8d64a5ba | 1856 | |
6ab30f9c JPM |
1857 | if (link_probing(l_ptr)) |
1858 | pr_cont(":P\n"); | |
1859 | else if (link_establishing(l_ptr)) | |
1860 | pr_cont(":E\n"); | |
1861 | else if (link_resetting(l_ptr)) | |
1862 | pr_cont(":R\n"); | |
1863 | else if (link_working(l_ptr)) | |
1864 | pr_cont(":W\n"); | |
5deedde9 PG |
1865 | else |
1866 | pr_cont("\n"); | |
b97bf3fd | 1867 | } |
0655f6a8 RA |
1868 | |
1869 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
1870 | */ | |
1871 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
1872 | { | |
1873 | int err; | |
1874 | ||
1875 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
1876 | tipc_nl_prop_policy); | |
1877 | if (err) | |
1878 | return err; | |
1879 | ||
1880 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1881 | u32 prio; | |
1882 | ||
1883 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1884 | if (prio > TIPC_MAX_LINK_PRI) | |
1885 | return -EINVAL; | |
1886 | } | |
1887 | ||
1888 | if (props[TIPC_NLA_PROP_TOL]) { | |
1889 | u32 tol; | |
1890 | ||
1891 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1892 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
1893 | return -EINVAL; | |
1894 | } | |
1895 | ||
1896 | if (props[TIPC_NLA_PROP_WIN]) { | |
1897 | u32 win; | |
1898 | ||
1899 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1900 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
1901 | return -EINVAL; | |
1902 | } | |
1903 | ||
1904 | return 0; | |
1905 | } | |
7be57fc6 | 1906 | |
f96ce7a2 RA |
1907 | int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info) |
1908 | { | |
1909 | int err; | |
1910 | int res = 0; | |
1911 | int bearer_id; | |
1912 | char *name; | |
1913 | struct tipc_link *link; | |
1914 | struct tipc_node *node; | |
1915 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
37e2d484 | 1916 | struct net *net = sock_net(skb->sk); |
f96ce7a2 RA |
1917 | |
1918 | if (!info->attrs[TIPC_NLA_LINK]) | |
1919 | return -EINVAL; | |
1920 | ||
1921 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
1922 | info->attrs[TIPC_NLA_LINK], | |
1923 | tipc_nl_link_policy); | |
1924 | if (err) | |
1925 | return err; | |
1926 | ||
1927 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
1928 | return -EINVAL; | |
1929 | ||
1930 | name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
1931 | ||
670f4f88 RA |
1932 | if (strcmp(name, tipc_bclink_name) == 0) |
1933 | return tipc_nl_bc_link_set(net, attrs); | |
1934 | ||
f2f9800d | 1935 | node = tipc_link_find_owner(net, name, &bearer_id); |
f96ce7a2 RA |
1936 | if (!node) |
1937 | return -EINVAL; | |
1938 | ||
1939 | tipc_node_lock(node); | |
1940 | ||
9d13ec65 | 1941 | link = node->links[bearer_id].link; |
f96ce7a2 RA |
1942 | if (!link) { |
1943 | res = -EINVAL; | |
1944 | goto out; | |
1945 | } | |
1946 | ||
1947 | if (attrs[TIPC_NLA_LINK_PROP]) { | |
1948 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; | |
1949 | ||
1950 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], | |
1951 | props); | |
1952 | if (err) { | |
1953 | res = err; | |
1954 | goto out; | |
1955 | } | |
1956 | ||
1957 | if (props[TIPC_NLA_PROP_TOL]) { | |
1958 | u32 tol; | |
1959 | ||
1960 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1961 | link_set_supervision_props(link, tol); | |
ed193ece | 1962 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0); |
f96ce7a2 RA |
1963 | } |
1964 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1965 | u32 prio; | |
1966 | ||
1967 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1968 | link->priority = prio; | |
ed193ece | 1969 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio); |
f96ce7a2 RA |
1970 | } |
1971 | if (props[TIPC_NLA_PROP_WIN]) { | |
1972 | u32 win; | |
1973 | ||
1974 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1975 | tipc_link_set_queue_limits(link, win); | |
1976 | } | |
1977 | } | |
1978 | ||
1979 | out: | |
1980 | tipc_node_unlock(node); | |
1981 | ||
1982 | return res; | |
1983 | } | |
d8182804 RA |
1984 | |
1985 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) | |
7be57fc6 RA |
1986 | { |
1987 | int i; | |
1988 | struct nlattr *stats; | |
1989 | ||
1990 | struct nla_map { | |
1991 | u32 key; | |
1992 | u32 val; | |
1993 | }; | |
1994 | ||
1995 | struct nla_map map[] = { | |
1996 | {TIPC_NLA_STATS_RX_INFO, s->recv_info}, | |
1997 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, | |
1998 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
1999 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
2000 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
2001 | {TIPC_NLA_STATS_TX_INFO, s->sent_info}, | |
2002 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, | |
2003 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
2004 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
2005 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
2006 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
2007 | s->msg_length_counts : 1}, | |
2008 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
2009 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
2010 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
2011 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
2012 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
2013 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
2014 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
2015 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
2016 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
2017 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
2018 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
2019 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
2020 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
2021 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
2022 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
2023 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
2024 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
2025 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
2026 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
2027 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
2028 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
2029 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
2030 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
2031 | }; | |
2032 | ||
2033 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
2034 | if (!stats) | |
2035 | return -EMSGSIZE; | |
2036 | ||
2037 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
2038 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
2039 | goto msg_full; | |
2040 | ||
2041 | nla_nest_end(skb, stats); | |
2042 | ||
2043 | return 0; | |
2044 | msg_full: | |
2045 | nla_nest_cancel(skb, stats); | |
2046 | ||
2047 | return -EMSGSIZE; | |
2048 | } | |
2049 | ||
2050 | /* Caller should hold appropriate locks to protect the link */ | |
34747539 | 2051 | static int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
f2f67390 | 2052 | struct tipc_link *link, int nlflags) |
7be57fc6 RA |
2053 | { |
2054 | int err; | |
2055 | void *hdr; | |
2056 | struct nlattr *attrs; | |
2057 | struct nlattr *prop; | |
34747539 | 2058 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
7be57fc6 | 2059 | |
bfb3e5dd | 2060 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
f2f67390 | 2061 | nlflags, TIPC_NL_LINK_GET); |
7be57fc6 RA |
2062 | if (!hdr) |
2063 | return -EMSGSIZE; | |
2064 | ||
2065 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
2066 | if (!attrs) | |
2067 | goto msg_full; | |
2068 | ||
2069 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
2070 | goto attr_msg_full; | |
2071 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, | |
34747539 | 2072 | tipc_cluster_mask(tn->own_addr))) |
7be57fc6 | 2073 | goto attr_msg_full; |
ed193ece | 2074 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
7be57fc6 | 2075 | goto attr_msg_full; |
a97b9d3f | 2076 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->rcv_nxt)) |
7be57fc6 | 2077 | goto attr_msg_full; |
a97b9d3f | 2078 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->snd_nxt)) |
7be57fc6 RA |
2079 | goto attr_msg_full; |
2080 | ||
2081 | if (tipc_link_is_up(link)) | |
2082 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2083 | goto attr_msg_full; | |
2084 | if (tipc_link_is_active(link)) | |
2085 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) | |
2086 | goto attr_msg_full; | |
2087 | ||
2088 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
2089 | if (!prop) | |
2090 | goto attr_msg_full; | |
2091 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2092 | goto prop_msg_full; | |
2093 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
2094 | goto prop_msg_full; | |
2095 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 2096 | link->window)) |
7be57fc6 RA |
2097 | goto prop_msg_full; |
2098 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2099 | goto prop_msg_full; | |
2100 | nla_nest_end(msg->skb, prop); | |
2101 | ||
2102 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
2103 | if (err) | |
2104 | goto attr_msg_full; | |
2105 | ||
2106 | nla_nest_end(msg->skb, attrs); | |
2107 | genlmsg_end(msg->skb, hdr); | |
2108 | ||
2109 | return 0; | |
2110 | ||
2111 | prop_msg_full: | |
2112 | nla_nest_cancel(msg->skb, prop); | |
2113 | attr_msg_full: | |
2114 | nla_nest_cancel(msg->skb, attrs); | |
2115 | msg_full: | |
2116 | genlmsg_cancel(msg->skb, hdr); | |
2117 | ||
2118 | return -EMSGSIZE; | |
2119 | } | |
2120 | ||
2121 | /* Caller should hold node lock */ | |
34747539 YX |
2122 | static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg, |
2123 | struct tipc_node *node, u32 *prev_link) | |
7be57fc6 RA |
2124 | { |
2125 | u32 i; | |
2126 | int err; | |
2127 | ||
2128 | for (i = *prev_link; i < MAX_BEARERS; i++) { | |
2129 | *prev_link = i; | |
2130 | ||
9d13ec65 | 2131 | if (!node->links[i].link) |
7be57fc6 RA |
2132 | continue; |
2133 | ||
9d13ec65 JPM |
2134 | err = __tipc_nl_add_link(net, msg, |
2135 | node->links[i].link, NLM_F_MULTI); | |
7be57fc6 RA |
2136 | if (err) |
2137 | return err; | |
2138 | } | |
2139 | *prev_link = 0; | |
2140 | ||
2141 | return 0; | |
2142 | } | |
2143 | ||
2144 | int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2145 | { | |
f2f9800d YX |
2146 | struct net *net = sock_net(skb->sk); |
2147 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
7be57fc6 RA |
2148 | struct tipc_node *node; |
2149 | struct tipc_nl_msg msg; | |
2150 | u32 prev_node = cb->args[0]; | |
2151 | u32 prev_link = cb->args[1]; | |
2152 | int done = cb->args[2]; | |
2153 | int err; | |
2154 | ||
2155 | if (done) | |
2156 | return 0; | |
2157 | ||
2158 | msg.skb = skb; | |
2159 | msg.portid = NETLINK_CB(cb->skb).portid; | |
2160 | msg.seq = cb->nlh->nlmsg_seq; | |
2161 | ||
2162 | rcu_read_lock(); | |
7be57fc6 | 2163 | if (prev_node) { |
f2f9800d | 2164 | node = tipc_node_find(net, prev_node); |
7be57fc6 RA |
2165 | if (!node) { |
2166 | /* We never set seq or call nl_dump_check_consistent() | |
2167 | * this means that setting prev_seq here will cause the | |
2168 | * consistence check to fail in the netlink callback | |
2169 | * handler. Resulting in the last NLMSG_DONE message | |
2170 | * having the NLM_F_DUMP_INTR flag set. | |
2171 | */ | |
2172 | cb->prev_seq = 1; | |
2173 | goto out; | |
2174 | } | |
8a0f6ebe | 2175 | tipc_node_put(node); |
7be57fc6 | 2176 | |
f2f9800d YX |
2177 | list_for_each_entry_continue_rcu(node, &tn->node_list, |
2178 | list) { | |
7be57fc6 | 2179 | tipc_node_lock(node); |
34747539 YX |
2180 | err = __tipc_nl_add_node_links(net, &msg, node, |
2181 | &prev_link); | |
7be57fc6 RA |
2182 | tipc_node_unlock(node); |
2183 | if (err) | |
2184 | goto out; | |
2185 | ||
2186 | prev_node = node->addr; | |
2187 | } | |
2188 | } else { | |
1da46568 | 2189 | err = tipc_nl_add_bc_link(net, &msg); |
7be57fc6 RA |
2190 | if (err) |
2191 | goto out; | |
2192 | ||
f2f9800d | 2193 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
7be57fc6 | 2194 | tipc_node_lock(node); |
34747539 YX |
2195 | err = __tipc_nl_add_node_links(net, &msg, node, |
2196 | &prev_link); | |
7be57fc6 RA |
2197 | tipc_node_unlock(node); |
2198 | if (err) | |
2199 | goto out; | |
2200 | ||
2201 | prev_node = node->addr; | |
2202 | } | |
2203 | } | |
2204 | done = 1; | |
2205 | out: | |
2206 | rcu_read_unlock(); | |
2207 | ||
2208 | cb->args[0] = prev_node; | |
2209 | cb->args[1] = prev_link; | |
2210 | cb->args[2] = done; | |
2211 | ||
2212 | return skb->len; | |
2213 | } | |
2214 | ||
2215 | int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info) | |
2216 | { | |
f2f9800d | 2217 | struct net *net = genl_info_net(info); |
7be57fc6 | 2218 | struct tipc_nl_msg msg; |
7be57fc6 | 2219 | char *name; |
7be57fc6 RA |
2220 | int err; |
2221 | ||
670f4f88 RA |
2222 | msg.portid = info->snd_portid; |
2223 | msg.seq = info->snd_seq; | |
2224 | ||
7be57fc6 RA |
2225 | if (!info->attrs[TIPC_NLA_LINK_NAME]) |
2226 | return -EINVAL; | |
7be57fc6 | 2227 | name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]); |
7be57fc6 | 2228 | |
670f4f88 RA |
2229 | msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
2230 | if (!msg.skb) | |
7be57fc6 RA |
2231 | return -ENOMEM; |
2232 | ||
670f4f88 RA |
2233 | if (strcmp(name, tipc_bclink_name) == 0) { |
2234 | err = tipc_nl_add_bc_link(net, &msg); | |
2235 | if (err) { | |
2236 | nlmsg_free(msg.skb); | |
2237 | return err; | |
2238 | } | |
2239 | } else { | |
2240 | int bearer_id; | |
2241 | struct tipc_node *node; | |
2242 | struct tipc_link *link; | |
7be57fc6 | 2243 | |
670f4f88 RA |
2244 | node = tipc_link_find_owner(net, name, &bearer_id); |
2245 | if (!node) | |
2246 | return -EINVAL; | |
7be57fc6 | 2247 | |
670f4f88 | 2248 | tipc_node_lock(node); |
9d13ec65 | 2249 | link = node->links[bearer_id].link; |
670f4f88 RA |
2250 | if (!link) { |
2251 | tipc_node_unlock(node); | |
2252 | nlmsg_free(msg.skb); | |
2253 | return -EINVAL; | |
2254 | } | |
7be57fc6 | 2255 | |
670f4f88 RA |
2256 | err = __tipc_nl_add_link(net, &msg, link, 0); |
2257 | tipc_node_unlock(node); | |
2258 | if (err) { | |
2259 | nlmsg_free(msg.skb); | |
2260 | return err; | |
2261 | } | |
2262 | } | |
7be57fc6 | 2263 | |
670f4f88 | 2264 | return genlmsg_reply(msg.skb, info); |
7be57fc6 | 2265 | } |
ae36342b RA |
2266 | |
2267 | int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info) | |
2268 | { | |
2269 | int err; | |
2270 | char *link_name; | |
2271 | unsigned int bearer_id; | |
2272 | struct tipc_link *link; | |
2273 | struct tipc_node *node; | |
2274 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
1817877b | 2275 | struct net *net = sock_net(skb->sk); |
ae36342b RA |
2276 | |
2277 | if (!info->attrs[TIPC_NLA_LINK]) | |
2278 | return -EINVAL; | |
2279 | ||
2280 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
2281 | info->attrs[TIPC_NLA_LINK], | |
2282 | tipc_nl_link_policy); | |
2283 | if (err) | |
2284 | return err; | |
2285 | ||
2286 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
2287 | return -EINVAL; | |
2288 | ||
2289 | link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
2290 | ||
2291 | if (strcmp(link_name, tipc_bclink_name) == 0) { | |
1da46568 | 2292 | err = tipc_bclink_reset_stats(net); |
ae36342b RA |
2293 | if (err) |
2294 | return err; | |
2295 | return 0; | |
2296 | } | |
2297 | ||
f2f9800d | 2298 | node = tipc_link_find_owner(net, link_name, &bearer_id); |
ae36342b RA |
2299 | if (!node) |
2300 | return -EINVAL; | |
2301 | ||
2302 | tipc_node_lock(node); | |
2303 | ||
9d13ec65 | 2304 | link = node->links[bearer_id].link; |
ae36342b RA |
2305 | if (!link) { |
2306 | tipc_node_unlock(node); | |
2307 | return -EINVAL; | |
2308 | } | |
2309 | ||
2310 | link_reset_statistics(link); | |
2311 | ||
2312 | tipc_node_unlock(node); | |
2313 | ||
2314 | return 0; | |
2315 | } |