2 * Copyright (C) 2009-2010 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"
27 #include <linux/ipv6.h>
28 #include <linux/udp.h>
29 #include <linux/if_vlan.h>
31 static void gw_node_free_ref(struct kref *refcount)
33 struct gw_node *gw_node;
35 gw_node = container_of(refcount, struct gw_node, refcount);
39 static void gw_node_free_rcu(struct rcu_head *rcu)
41 struct gw_node *gw_node;
43 gw_node = container_of(rcu, struct gw_node, rcu);
44 kref_put(&gw_node->refcount, gw_node_free_ref);
47 void *gw_get_selected(struct bat_priv *bat_priv)
49 struct gw_node *curr_gateway_tmp = bat_priv->curr_gw;
51 if (!curr_gateway_tmp)
54 return curr_gateway_tmp->orig_node;
57 void gw_deselect(struct bat_priv *bat_priv)
59 struct gw_node *gw_node = bat_priv->curr_gw;
61 bat_priv->curr_gw = NULL;
64 kref_put(&gw_node->refcount, gw_node_free_ref);
67 static struct gw_node *gw_select(struct bat_priv *bat_priv,
68 struct gw_node *new_gw_node)
70 struct gw_node *curr_gw_node = bat_priv->curr_gw;
73 kref_get(&new_gw_node->refcount);
75 bat_priv->curr_gw = new_gw_node;
79 void gw_election(struct bat_priv *bat_priv)
81 struct hlist_node *node;
82 struct gw_node *gw_node, *curr_gw_tmp = NULL, *old_gw_node = NULL;
84 uint32_t max_gw_factor = 0, tmp_gw_factor = 0;
88 * The batman daemon checks here if we already passed a full originator
89 * cycle in order to make sure we don't choose the first gateway we
90 * hear about. This check is based on the daemon's uptime which we
93 if (atomic_read(&bat_priv->gw_mode) != GW_MODE_CLIENT)
96 if (bat_priv->curr_gw)
100 if (hlist_empty(&bat_priv->gw_list)) {
103 if (bat_priv->curr_gw) {
104 bat_dbg(DBG_BATMAN, bat_priv,
105 "Removing selected gateway - "
106 "no gateway in range\n");
107 gw_deselect(bat_priv);
113 hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
114 if (!gw_node->orig_node->router)
117 if (gw_node->deleted)
120 switch (atomic_read(&bat_priv->gw_sel_class)) {
121 case 1: /* fast connection */
122 gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags,
125 tmp_gw_factor = (gw_node->orig_node->router->tq_avg *
126 gw_node->orig_node->router->tq_avg *
128 (TQ_LOCAL_WINDOW_SIZE *
129 TQ_LOCAL_WINDOW_SIZE * 64);
131 if ((tmp_gw_factor > max_gw_factor) ||
132 ((tmp_gw_factor == max_gw_factor) &&
133 (gw_node->orig_node->router->tq_avg > max_tq)))
134 curr_gw_tmp = gw_node;
138 * 2: stable connection (use best statistic)
139 * 3: fast-switch (use best statistic but change as
140 * soon as a better gateway appears)
141 * XX: late-switch (use best statistic but change as
142 * soon as a better gateway appears which has
143 * $routing_class more tq points)
145 if (gw_node->orig_node->router->tq_avg > max_tq)
146 curr_gw_tmp = gw_node;
150 if (gw_node->orig_node->router->tq_avg > max_tq)
151 max_tq = gw_node->orig_node->router->tq_avg;
153 if (tmp_gw_factor > max_gw_factor)
154 max_gw_factor = tmp_gw_factor;
157 if (bat_priv->curr_gw != curr_gw_tmp) {
158 if ((bat_priv->curr_gw) && (!curr_gw_tmp))
159 bat_dbg(DBG_BATMAN, bat_priv,
160 "Removing selected gateway - "
161 "no gateway in range\n");
162 else if ((!bat_priv->curr_gw) && (curr_gw_tmp))
163 bat_dbg(DBG_BATMAN, bat_priv,
164 "Adding route to gateway %pM "
165 "(gw_flags: %i, tq: %i)\n",
166 curr_gw_tmp->orig_node->orig,
167 curr_gw_tmp->orig_node->gw_flags,
168 curr_gw_tmp->orig_node->router->tq_avg);
170 bat_dbg(DBG_BATMAN, bat_priv,
171 "Changing route to gateway %pM "
172 "(gw_flags: %i, tq: %i)\n",
173 curr_gw_tmp->orig_node->orig,
174 curr_gw_tmp->orig_node->gw_flags,
175 curr_gw_tmp->orig_node->router->tq_avg);
177 old_gw_node = gw_select(bat_priv, curr_gw_tmp);
182 /* the kfree() has to be outside of the rcu lock */
184 kref_put(&old_gw_node->refcount, gw_node_free_ref);
187 void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node)
189 struct gw_node *curr_gateway_tmp = bat_priv->curr_gw;
190 uint8_t gw_tq_avg, orig_tq_avg;
192 if (!curr_gateway_tmp)
195 if (!curr_gateway_tmp->orig_node)
198 if (!curr_gateway_tmp->orig_node->router)
201 /* this node already is the gateway */
202 if (curr_gateway_tmp->orig_node == orig_node)
205 if (!orig_node->router)
208 gw_tq_avg = curr_gateway_tmp->orig_node->router->tq_avg;
209 orig_tq_avg = orig_node->router->tq_avg;
211 /* the TQ value has to be better */
212 if (orig_tq_avg < gw_tq_avg)
216 * if the routing class is greater than 3 the value tells us how much
217 * greater the TQ value of the new gateway must be
219 if ((atomic_read(&bat_priv->gw_sel_class) > 3) &&
220 (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class)))
223 bat_dbg(DBG_BATMAN, bat_priv,
224 "Restarting gateway selection: better gateway found (tq curr: "
226 gw_tq_avg, orig_tq_avg);
229 gw_deselect(bat_priv);
232 static void gw_node_add(struct bat_priv *bat_priv,
233 struct orig_node *orig_node, uint8_t new_gwflags)
235 struct gw_node *gw_node;
238 gw_node = kmalloc(sizeof(struct gw_node), GFP_ATOMIC);
242 memset(gw_node, 0, sizeof(struct gw_node));
243 INIT_HLIST_NODE(&gw_node->list);
244 gw_node->orig_node = orig_node;
245 kref_init(&gw_node->refcount);
247 spin_lock_bh(&bat_priv->gw_list_lock);
248 hlist_add_head_rcu(&gw_node->list, &bat_priv->gw_list);
249 spin_unlock_bh(&bat_priv->gw_list_lock);
251 gw_bandwidth_to_kbit(new_gwflags, &down, &up);
252 bat_dbg(DBG_BATMAN, bat_priv,
253 "Found new gateway %pM -> gw_class: %i - %i%s/%i%s\n",
254 orig_node->orig, new_gwflags,
255 (down > 2048 ? down / 1024 : down),
256 (down > 2048 ? "MBit" : "KBit"),
257 (up > 2048 ? up / 1024 : up),
258 (up > 2048 ? "MBit" : "KBit"));
261 void gw_node_update(struct bat_priv *bat_priv,
262 struct orig_node *orig_node, uint8_t new_gwflags)
264 struct hlist_node *node;
265 struct gw_node *gw_node;
268 hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
269 if (gw_node->orig_node != orig_node)
272 bat_dbg(DBG_BATMAN, bat_priv,
273 "Gateway class of originator %pM changed from "
275 orig_node->orig, gw_node->orig_node->gw_flags,
278 gw_node->deleted = 0;
280 if (new_gwflags == 0) {
281 gw_node->deleted = jiffies;
282 bat_dbg(DBG_BATMAN, bat_priv,
283 "Gateway %pM removed from gateway list\n",
286 if (gw_node == bat_priv->curr_gw) {
288 gw_deselect(bat_priv);
298 if (new_gwflags == 0)
301 gw_node_add(bat_priv, orig_node, new_gwflags);
304 void gw_node_delete(struct bat_priv *bat_priv, struct orig_node *orig_node)
306 return gw_node_update(bat_priv, orig_node, 0);
309 void gw_node_purge(struct bat_priv *bat_priv)
311 struct gw_node *gw_node;
312 struct hlist_node *node, *node_tmp;
313 unsigned long timeout = 2 * PURGE_TIMEOUT * HZ;
315 spin_lock_bh(&bat_priv->gw_list_lock);
317 hlist_for_each_entry_safe(gw_node, node, node_tmp,
318 &bat_priv->gw_list, list) {
319 if (((!gw_node->deleted) ||
320 (time_before(jiffies, gw_node->deleted + timeout))) &&
321 atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE)
324 if (bat_priv->curr_gw == gw_node)
325 gw_deselect(bat_priv);
327 hlist_del_rcu(&gw_node->list);
328 call_rcu(&gw_node->rcu, gw_node_free_rcu);
332 spin_unlock_bh(&bat_priv->gw_list_lock);
335 static int _write_buffer_text(struct bat_priv *bat_priv,
336 struct seq_file *seq, struct gw_node *gw_node)
340 gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up);
342 return seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n",
343 (bat_priv->curr_gw == gw_node ? "=>" : " "),
344 gw_node->orig_node->orig,
345 gw_node->orig_node->router->tq_avg,
346 gw_node->orig_node->router->addr,
347 gw_node->orig_node->router->if_incoming->net_dev->name,
348 gw_node->orig_node->gw_flags,
349 (down > 2048 ? down / 1024 : down),
350 (down > 2048 ? "MBit" : "KBit"),
351 (up > 2048 ? up / 1024 : up),
352 (up > 2048 ? "MBit" : "KBit"));
355 int gw_client_seq_print_text(struct seq_file *seq, void *offset)
357 struct net_device *net_dev = (struct net_device *)seq->private;
358 struct bat_priv *bat_priv = netdev_priv(net_dev);
359 struct gw_node *gw_node;
360 struct hlist_node *node;
363 if (!bat_priv->primary_if) {
365 return seq_printf(seq, "BATMAN mesh %s disabled - please "
366 "specify interfaces to enable it\n",
370 if (bat_priv->primary_if->if_status != IF_ACTIVE) {
372 return seq_printf(seq, "BATMAN mesh %s disabled - "
373 "primary interface not active\n",
377 seq_printf(seq, " %-12s (%s/%i) %17s [%10s]: gw_class ... "
378 "[B.A.T.M.A.N. adv %s%s, MainIF/MAC: %s/%pM (%s)]\n",
379 "Gateway", "#", TQ_MAX_VALUE, "Nexthop",
380 "outgoingIF", SOURCE_VERSION, REVISION_VERSION_STR,
381 bat_priv->primary_if->net_dev->name,
382 bat_priv->primary_if->net_dev->dev_addr, net_dev->name);
385 hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
386 if (gw_node->deleted)
389 if (!gw_node->orig_node->router)
392 _write_buffer_text(bat_priv, seq, gw_node);
398 seq_printf(seq, "No gateways in range ...\n");
403 int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb)
405 struct ethhdr *ethhdr;
407 struct ipv6hdr *ipv6hdr;
408 struct udphdr *udphdr;
409 unsigned int header_len = 0;
411 if (atomic_read(&bat_priv->gw_mode) == GW_MODE_OFF)
414 /* check for ethernet header */
415 if (!pskb_may_pull(skb, header_len + ETH_HLEN))
417 ethhdr = (struct ethhdr *)skb->data;
418 header_len += ETH_HLEN;
420 /* check for initial vlan header */
421 if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
422 if (!pskb_may_pull(skb, header_len + VLAN_HLEN))
424 ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN);
425 header_len += VLAN_HLEN;
428 /* check for ip header */
429 switch (ntohs(ethhdr->h_proto)) {
431 if (!pskb_may_pull(skb, header_len + sizeof(struct iphdr)))
433 iphdr = (struct iphdr *)(skb->data + header_len);
434 header_len += iphdr->ihl * 4;
436 /* check for udp header */
437 if (iphdr->protocol != IPPROTO_UDP)
442 if (!pskb_may_pull(skb, header_len + sizeof(struct ipv6hdr)))
444 ipv6hdr = (struct ipv6hdr *)(skb->data + header_len);
445 header_len += sizeof(struct ipv6hdr);
447 /* check for udp header */
448 if (ipv6hdr->nexthdr != IPPROTO_UDP)
456 if (!pskb_may_pull(skb, header_len + sizeof(struct udphdr)))
458 udphdr = (struct udphdr *)(skb->data + header_len);
459 header_len += sizeof(struct udphdr);
461 /* check for bootp port */
462 if ((ntohs(ethhdr->h_proto) == ETH_P_IP) &&
463 (ntohs(udphdr->dest) != 67))
466 if ((ntohs(ethhdr->h_proto) == ETH_P_IPV6) &&
467 (ntohs(udphdr->dest) != 547))
470 if (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER)
473 if (!bat_priv->curr_gw)