2 * Copyright (C) 2009-2011 B.A.T.M.A.N. contributors:
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23 #include "gateway_client.h"
24 #include "gateway_common.h"
25 #include "hard-interface.h"
26 #include "originator.h"
28 #include <linux/ipv6.h>
29 #include <linux/udp.h>
30 #include <linux/if_vlan.h>
32 static void gw_node_free_rcu(struct rcu_head
*rcu
)
34 struct gw_node
*gw_node
;
36 gw_node
= container_of(rcu
, struct gw_node
, rcu
);
40 static void gw_node_free_ref(struct gw_node
*gw_node
)
42 if (atomic_dec_and_test(&gw_node
->refcount
))
43 call_rcu(&gw_node
->rcu
, gw_node_free_rcu
);
46 static struct gw_node
*gw_get_selected_gw_node(struct bat_priv
*bat_priv
)
48 struct gw_node
*gw_node
;
51 gw_node
= rcu_dereference(bat_priv
->curr_gw
);
55 if (!atomic_inc_not_zero(&gw_node
->refcount
))
63 struct orig_node
*gw_get_selected_orig(struct bat_priv
*bat_priv
)
65 struct gw_node
*gw_node
;
66 struct orig_node
*orig_node
= NULL
;
68 gw_node
= gw_get_selected_gw_node(bat_priv
);
73 orig_node
= gw_node
->orig_node
;
77 if (!atomic_inc_not_zero(&orig_node
->refcount
))
84 gw_node_free_ref(gw_node
);
88 static void gw_select(struct bat_priv
*bat_priv
, struct gw_node
*new_gw_node
)
90 struct gw_node
*curr_gw_node
;
92 spin_lock_bh(&bat_priv
->gw_list_lock
);
94 if (new_gw_node
&& !atomic_inc_not_zero(&new_gw_node
->refcount
))
97 curr_gw_node
= bat_priv
->curr_gw
;
98 rcu_assign_pointer(bat_priv
->curr_gw
, new_gw_node
);
101 gw_node_free_ref(curr_gw_node
);
103 spin_unlock_bh(&bat_priv
->gw_list_lock
);
106 void gw_deselect(struct bat_priv
*bat_priv
)
108 gw_select(bat_priv
, NULL
);
111 void gw_election(struct bat_priv
*bat_priv
)
113 struct hlist_node
*node
;
114 struct gw_node
*gw_node
, *curr_gw
= NULL
, *curr_gw_tmp
= NULL
;
115 struct neigh_node
*router
;
117 uint32_t max_gw_factor
= 0, tmp_gw_factor
= 0;
121 * The batman daemon checks here if we already passed a full originator
122 * cycle in order to make sure we don't choose the first gateway we
123 * hear about. This check is based on the daemon's uptime which we
126 if (atomic_read(&bat_priv
->gw_mode
) != GW_MODE_CLIENT
)
129 curr_gw
= gw_get_selected_gw_node(bat_priv
);
134 if (hlist_empty(&bat_priv
->gw_list
)) {
135 bat_dbg(DBG_BATMAN
, bat_priv
,
136 "Removing selected gateway - "
137 "no gateway in range\n");
138 gw_deselect(bat_priv
);
142 hlist_for_each_entry_rcu(gw_node
, node
, &bat_priv
->gw_list
, list
) {
143 if (gw_node
->deleted
)
146 router
= orig_node_get_router(gw_node
->orig_node
);
150 switch (atomic_read(&bat_priv
->gw_sel_class
)) {
151 case 1: /* fast connection */
152 gw_bandwidth_to_kbit(gw_node
->orig_node
->gw_flags
,
155 tmp_gw_factor
= (router
->tq_avg
* router
->tq_avg
*
157 (TQ_LOCAL_WINDOW_SIZE
*
158 TQ_LOCAL_WINDOW_SIZE
* 64);
160 if ((tmp_gw_factor
> max_gw_factor
) ||
161 ((tmp_gw_factor
== max_gw_factor
) &&
162 (router
->tq_avg
> max_tq
)))
163 curr_gw_tmp
= gw_node
;
167 * 2: stable connection (use best statistic)
168 * 3: fast-switch (use best statistic but change as
169 * soon as a better gateway appears)
170 * XX: late-switch (use best statistic but change as
171 * soon as a better gateway appears which has
172 * $routing_class more tq points)
174 if (router
->tq_avg
> max_tq
)
175 curr_gw_tmp
= gw_node
;
179 if (router
->tq_avg
> max_tq
)
180 max_tq
= router
->tq_avg
;
182 if (tmp_gw_factor
> max_gw_factor
)
183 max_gw_factor
= tmp_gw_factor
;
185 neigh_node_free_ref(router
);
188 if (curr_gw
!= curr_gw_tmp
) {
189 router
= orig_node_get_router(curr_gw_tmp
->orig_node
);
193 if ((curr_gw
) && (!curr_gw_tmp
))
194 bat_dbg(DBG_BATMAN
, bat_priv
,
195 "Removing selected gateway - "
196 "no gateway in range\n");
197 else if ((!curr_gw
) && (curr_gw_tmp
))
198 bat_dbg(DBG_BATMAN
, bat_priv
,
199 "Adding route to gateway %pM "
200 "(gw_flags: %i, tq: %i)\n",
201 curr_gw_tmp
->orig_node
->orig
,
202 curr_gw_tmp
->orig_node
->gw_flags
,
205 bat_dbg(DBG_BATMAN
, bat_priv
,
206 "Changing route to gateway %pM "
207 "(gw_flags: %i, tq: %i)\n",
208 curr_gw_tmp
->orig_node
->orig
,
209 curr_gw_tmp
->orig_node
->gw_flags
,
212 neigh_node_free_ref(router
);
213 gw_select(bat_priv
, curr_gw_tmp
);
220 gw_node_free_ref(curr_gw
);
223 void gw_check_election(struct bat_priv
*bat_priv
, struct orig_node
*orig_node
)
225 struct orig_node
*curr_gw_orig
;
226 struct neigh_node
*router_gw
= NULL
, *router_orig
= NULL
;
227 uint8_t gw_tq_avg
, orig_tq_avg
;
229 curr_gw_orig
= gw_get_selected_orig(bat_priv
);
233 router_gw
= orig_node_get_router(curr_gw_orig
);
237 /* this node already is the gateway */
238 if (curr_gw_orig
== orig_node
)
241 router_orig
= orig_node_get_router(orig_node
);
245 gw_tq_avg
= router_gw
->tq_avg
;
246 orig_tq_avg
= router_orig
->tq_avg
;
248 /* the TQ value has to be better */
249 if (orig_tq_avg
< gw_tq_avg
)
253 * if the routing class is greater than 3 the value tells us how much
254 * greater the TQ value of the new gateway must be
256 if ((atomic_read(&bat_priv
->gw_sel_class
) > 3) &&
257 (orig_tq_avg
- gw_tq_avg
< atomic_read(&bat_priv
->gw_sel_class
)))
260 bat_dbg(DBG_BATMAN
, bat_priv
,
261 "Restarting gateway selection: better gateway found (tq curr: "
263 gw_tq_avg
, orig_tq_avg
);
266 gw_deselect(bat_priv
);
269 orig_node_free_ref(curr_gw_orig
);
271 neigh_node_free_ref(router_gw
);
273 neigh_node_free_ref(router_orig
);
278 static void gw_node_add(struct bat_priv
*bat_priv
,
279 struct orig_node
*orig_node
, uint8_t new_gwflags
)
281 struct gw_node
*gw_node
;
284 gw_node
= kmalloc(sizeof(struct gw_node
), GFP_ATOMIC
);
288 memset(gw_node
, 0, sizeof(struct gw_node
));
289 INIT_HLIST_NODE(&gw_node
->list
);
290 gw_node
->orig_node
= orig_node
;
291 atomic_set(&gw_node
->refcount
, 1);
293 spin_lock_bh(&bat_priv
->gw_list_lock
);
294 hlist_add_head_rcu(&gw_node
->list
, &bat_priv
->gw_list
);
295 spin_unlock_bh(&bat_priv
->gw_list_lock
);
297 gw_bandwidth_to_kbit(new_gwflags
, &down
, &up
);
298 bat_dbg(DBG_BATMAN
, bat_priv
,
299 "Found new gateway %pM -> gw_class: %i - %i%s/%i%s\n",
300 orig_node
->orig
, new_gwflags
,
301 (down
> 2048 ? down
/ 1024 : down
),
302 (down
> 2048 ? "MBit" : "KBit"),
303 (up
> 2048 ? up
/ 1024 : up
),
304 (up
> 2048 ? "MBit" : "KBit"));
307 void gw_node_update(struct bat_priv
*bat_priv
,
308 struct orig_node
*orig_node
, uint8_t new_gwflags
)
310 struct hlist_node
*node
;
311 struct gw_node
*gw_node
, *curr_gw
;
313 curr_gw
= gw_get_selected_gw_node(bat_priv
);
318 hlist_for_each_entry_rcu(gw_node
, node
, &bat_priv
->gw_list
, list
) {
319 if (gw_node
->orig_node
!= orig_node
)
322 bat_dbg(DBG_BATMAN
, bat_priv
,
323 "Gateway class of originator %pM changed from "
325 orig_node
->orig
, gw_node
->orig_node
->gw_flags
,
328 gw_node
->deleted
= 0;
330 if (new_gwflags
== 0) {
331 gw_node
->deleted
= jiffies
;
332 bat_dbg(DBG_BATMAN
, bat_priv
,
333 "Gateway %pM removed from gateway list\n",
336 if (gw_node
== curr_gw
)
343 if (new_gwflags
== 0)
346 gw_node_add(bat_priv
, orig_node
, new_gwflags
);
350 gw_deselect(bat_priv
);
355 gw_node_free_ref(curr_gw
);
358 void gw_node_delete(struct bat_priv
*bat_priv
, struct orig_node
*orig_node
)
360 return gw_node_update(bat_priv
, orig_node
, 0);
363 void gw_node_purge(struct bat_priv
*bat_priv
)
365 struct gw_node
*gw_node
, *curr_gw
;
366 struct hlist_node
*node
, *node_tmp
;
367 unsigned long timeout
= 2 * PURGE_TIMEOUT
* HZ
;
368 char do_deselect
= 0;
370 curr_gw
= gw_get_selected_gw_node(bat_priv
);
372 spin_lock_bh(&bat_priv
->gw_list_lock
);
374 hlist_for_each_entry_safe(gw_node
, node
, node_tmp
,
375 &bat_priv
->gw_list
, list
) {
376 if (((!gw_node
->deleted
) ||
377 (time_before(jiffies
, gw_node
->deleted
+ timeout
))) &&
378 atomic_read(&bat_priv
->mesh_state
) == MESH_ACTIVE
)
381 if (curr_gw
== gw_node
)
384 hlist_del_rcu(&gw_node
->list
);
385 gw_node_free_ref(gw_node
);
388 spin_unlock_bh(&bat_priv
->gw_list_lock
);
390 /* gw_deselect() needs to acquire the gw_list_lock */
392 gw_deselect(bat_priv
);
395 gw_node_free_ref(curr_gw
);
399 * fails if orig_node has no router
401 static int _write_buffer_text(struct bat_priv
*bat_priv
,
402 struct seq_file
*seq
, struct gw_node
*gw_node
)
404 struct gw_node
*curr_gw
;
405 struct neigh_node
*router
;
406 int down
, up
, ret
= -1;
408 gw_bandwidth_to_kbit(gw_node
->orig_node
->gw_flags
, &down
, &up
);
410 router
= orig_node_get_router(gw_node
->orig_node
);
414 curr_gw
= gw_get_selected_gw_node(bat_priv
);
416 ret
= seq_printf(seq
, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n",
417 (curr_gw
== gw_node
? "=>" : " "),
418 gw_node
->orig_node
->orig
,
419 router
->tq_avg
, router
->addr
,
420 router
->if_incoming
->net_dev
->name
,
421 gw_node
->orig_node
->gw_flags
,
422 (down
> 2048 ? down
/ 1024 : down
),
423 (down
> 2048 ? "MBit" : "KBit"),
424 (up
> 2048 ? up
/ 1024 : up
),
425 (up
> 2048 ? "MBit" : "KBit"));
427 neigh_node_free_ref(router
);
429 gw_node_free_ref(curr_gw
);
434 int gw_client_seq_print_text(struct seq_file
*seq
, void *offset
)
436 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
437 struct bat_priv
*bat_priv
= netdev_priv(net_dev
);
438 struct gw_node
*gw_node
;
439 struct hlist_node
*node
;
442 if (!bat_priv
->primary_if
) {
444 return seq_printf(seq
, "BATMAN mesh %s disabled - please "
445 "specify interfaces to enable it\n",
449 if (bat_priv
->primary_if
->if_status
!= IF_ACTIVE
) {
451 return seq_printf(seq
, "BATMAN mesh %s disabled - "
452 "primary interface not active\n",
456 seq_printf(seq
, " %-12s (%s/%i) %17s [%10s]: gw_class ... "
457 "[B.A.T.M.A.N. adv %s%s, MainIF/MAC: %s/%pM (%s)]\n",
458 "Gateway", "#", TQ_MAX_VALUE
, "Nexthop",
459 "outgoingIF", SOURCE_VERSION
, REVISION_VERSION_STR
,
460 bat_priv
->primary_if
->net_dev
->name
,
461 bat_priv
->primary_if
->net_dev
->dev_addr
, net_dev
->name
);
464 hlist_for_each_entry_rcu(gw_node
, node
, &bat_priv
->gw_list
, list
) {
465 if (gw_node
->deleted
)
468 /* fails if orig_node has no router */
469 if (_write_buffer_text(bat_priv
, seq
, gw_node
) < 0)
477 seq_printf(seq
, "No gateways in range ...\n");
482 int gw_is_target(struct bat_priv
*bat_priv
, struct sk_buff
*skb
)
484 struct ethhdr
*ethhdr
;
486 struct ipv6hdr
*ipv6hdr
;
487 struct udphdr
*udphdr
;
488 struct gw_node
*curr_gw
;
489 unsigned int header_len
= 0;
491 if (atomic_read(&bat_priv
->gw_mode
) == GW_MODE_OFF
)
494 /* check for ethernet header */
495 if (!pskb_may_pull(skb
, header_len
+ ETH_HLEN
))
497 ethhdr
= (struct ethhdr
*)skb
->data
;
498 header_len
+= ETH_HLEN
;
500 /* check for initial vlan header */
501 if (ntohs(ethhdr
->h_proto
) == ETH_P_8021Q
) {
502 if (!pskb_may_pull(skb
, header_len
+ VLAN_HLEN
))
504 ethhdr
= (struct ethhdr
*)(skb
->data
+ VLAN_HLEN
);
505 header_len
+= VLAN_HLEN
;
508 /* check for ip header */
509 switch (ntohs(ethhdr
->h_proto
)) {
511 if (!pskb_may_pull(skb
, header_len
+ sizeof(struct iphdr
)))
513 iphdr
= (struct iphdr
*)(skb
->data
+ header_len
);
514 header_len
+= iphdr
->ihl
* 4;
516 /* check for udp header */
517 if (iphdr
->protocol
!= IPPROTO_UDP
)
522 if (!pskb_may_pull(skb
, header_len
+ sizeof(struct ipv6hdr
)))
524 ipv6hdr
= (struct ipv6hdr
*)(skb
->data
+ header_len
);
525 header_len
+= sizeof(struct ipv6hdr
);
527 /* check for udp header */
528 if (ipv6hdr
->nexthdr
!= IPPROTO_UDP
)
536 if (!pskb_may_pull(skb
, header_len
+ sizeof(struct udphdr
)))
538 udphdr
= (struct udphdr
*)(skb
->data
+ header_len
);
539 header_len
+= sizeof(struct udphdr
);
541 /* check for bootp port */
542 if ((ntohs(ethhdr
->h_proto
) == ETH_P_IP
) &&
543 (ntohs(udphdr
->dest
) != 67))
546 if ((ntohs(ethhdr
->h_proto
) == ETH_P_IPV6
) &&
547 (ntohs(udphdr
->dest
) != 547))
550 if (atomic_read(&bat_priv
->gw_mode
) == GW_MODE_SERVER
)
553 curr_gw
= gw_get_selected_gw_node(bat_priv
);
558 gw_node_free_ref(curr_gw
);
This page took 0.043263 seconds and 5 git commands to generate.