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_ref(struct gw_node *gw_node)
34 if (atomic_dec_and_test(&gw_node->refcount))
35 kfree_rcu(gw_node, rcu);
38 static struct gw_node *gw_get_selected_gw_node(struct bat_priv *bat_priv)
40 struct gw_node *gw_node;
43 gw_node = rcu_dereference(bat_priv->curr_gw);
47 if (!atomic_inc_not_zero(&gw_node->refcount))
55 struct orig_node *gw_get_selected_orig(struct bat_priv *bat_priv)
57 struct gw_node *gw_node;
58 struct orig_node *orig_node = NULL;
60 gw_node = gw_get_selected_gw_node(bat_priv);
65 orig_node = gw_node->orig_node;
69 if (!atomic_inc_not_zero(&orig_node->refcount))
76 gw_node_free_ref(gw_node);
80 static void gw_select(struct bat_priv *bat_priv, struct gw_node *new_gw_node)
82 struct gw_node *curr_gw_node;
84 spin_lock_bh(&bat_priv->gw_list_lock);
86 if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount))
89 curr_gw_node = rcu_dereference_protected(bat_priv->curr_gw, 1);
90 rcu_assign_pointer(bat_priv->curr_gw, new_gw_node);
93 gw_node_free_ref(curr_gw_node);
95 spin_unlock_bh(&bat_priv->gw_list_lock);
98 void gw_deselect(struct bat_priv *bat_priv)
100 gw_select(bat_priv, NULL);
103 void gw_election(struct bat_priv *bat_priv)
105 struct hlist_node *node;
106 struct gw_node *gw_node, *curr_gw = NULL, *curr_gw_tmp = NULL;
107 struct neigh_node *router;
109 uint32_t max_gw_factor = 0, tmp_gw_factor = 0;
113 * The batman daemon checks here if we already passed a full originator
114 * cycle in order to make sure we don't choose the first gateway we
115 * hear about. This check is based on the daemon's uptime which we
118 if (atomic_read(&bat_priv->gw_mode) != GW_MODE_CLIENT)
121 curr_gw = gw_get_selected_gw_node(bat_priv);
126 if (hlist_empty(&bat_priv->gw_list)) {
127 bat_dbg(DBG_BATMAN, bat_priv,
128 "Removing selected gateway - "
129 "no gateway in range\n");
130 gw_deselect(bat_priv);
134 hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
135 if (gw_node->deleted)
138 router = orig_node_get_router(gw_node->orig_node);
142 switch (atomic_read(&bat_priv->gw_sel_class)) {
143 case 1: /* fast connection */
144 gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags,
147 tmp_gw_factor = (router->tq_avg * router->tq_avg *
149 (TQ_LOCAL_WINDOW_SIZE *
150 TQ_LOCAL_WINDOW_SIZE * 64);
152 if ((tmp_gw_factor > max_gw_factor) ||
153 ((tmp_gw_factor == max_gw_factor) &&
154 (router->tq_avg > max_tq)))
155 curr_gw_tmp = gw_node;
159 * 2: stable connection (use best statistic)
160 * 3: fast-switch (use best statistic but change as
161 * soon as a better gateway appears)
162 * XX: late-switch (use best statistic but change as
163 * soon as a better gateway appears which has
164 * $routing_class more tq points)
166 if (router->tq_avg > max_tq)
167 curr_gw_tmp = gw_node;
171 if (router->tq_avg > max_tq)
172 max_tq = router->tq_avg;
174 if (tmp_gw_factor > max_gw_factor)
175 max_gw_factor = tmp_gw_factor;
177 neigh_node_free_ref(router);
180 if (curr_gw != curr_gw_tmp) {
181 router = orig_node_get_router(curr_gw_tmp->orig_node);
185 if ((curr_gw) && (!curr_gw_tmp))
186 bat_dbg(DBG_BATMAN, bat_priv,
187 "Removing selected gateway - "
188 "no gateway in range\n");
189 else if ((!curr_gw) && (curr_gw_tmp))
190 bat_dbg(DBG_BATMAN, bat_priv,
191 "Adding route to gateway %pM "
192 "(gw_flags: %i, tq: %i)\n",
193 curr_gw_tmp->orig_node->orig,
194 curr_gw_tmp->orig_node->gw_flags,
197 bat_dbg(DBG_BATMAN, bat_priv,
198 "Changing route to gateway %pM "
199 "(gw_flags: %i, tq: %i)\n",
200 curr_gw_tmp->orig_node->orig,
201 curr_gw_tmp->orig_node->gw_flags,
204 neigh_node_free_ref(router);
205 gw_select(bat_priv, curr_gw_tmp);
212 gw_node_free_ref(curr_gw);
215 void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node)
217 struct orig_node *curr_gw_orig;
218 struct neigh_node *router_gw = NULL, *router_orig = NULL;
219 uint8_t gw_tq_avg, orig_tq_avg;
221 curr_gw_orig = gw_get_selected_orig(bat_priv);
225 router_gw = orig_node_get_router(curr_gw_orig);
229 /* this node already is the gateway */
230 if (curr_gw_orig == orig_node)
233 router_orig = orig_node_get_router(orig_node);
237 gw_tq_avg = router_gw->tq_avg;
238 orig_tq_avg = router_orig->tq_avg;
240 /* the TQ value has to be better */
241 if (orig_tq_avg < gw_tq_avg)
245 * if the routing class is greater than 3 the value tells us how much
246 * greater the TQ value of the new gateway must be
248 if ((atomic_read(&bat_priv->gw_sel_class) > 3) &&
249 (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class)))
252 bat_dbg(DBG_BATMAN, bat_priv,
253 "Restarting gateway selection: better gateway found (tq curr: "
255 gw_tq_avg, orig_tq_avg);
258 gw_deselect(bat_priv);
261 orig_node_free_ref(curr_gw_orig);
263 neigh_node_free_ref(router_gw);
265 neigh_node_free_ref(router_orig);
270 static void gw_node_add(struct bat_priv *bat_priv,
271 struct orig_node *orig_node, uint8_t new_gwflags)
273 struct gw_node *gw_node;
276 gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC);
280 INIT_HLIST_NODE(&gw_node->list);
281 gw_node->orig_node = orig_node;
282 atomic_set(&gw_node->refcount, 1);
284 spin_lock_bh(&bat_priv->gw_list_lock);
285 hlist_add_head_rcu(&gw_node->list, &bat_priv->gw_list);
286 spin_unlock_bh(&bat_priv->gw_list_lock);
288 gw_bandwidth_to_kbit(new_gwflags, &down, &up);
289 bat_dbg(DBG_BATMAN, bat_priv,
290 "Found new gateway %pM -> gw_class: %i - %i%s/%i%s\n",
291 orig_node->orig, new_gwflags,
292 (down > 2048 ? down / 1024 : down),
293 (down > 2048 ? "MBit" : "KBit"),
294 (up > 2048 ? up / 1024 : up),
295 (up > 2048 ? "MBit" : "KBit"));
298 void gw_node_update(struct bat_priv *bat_priv,
299 struct orig_node *orig_node, uint8_t new_gwflags)
301 struct hlist_node *node;
302 struct gw_node *gw_node, *curr_gw;
305 * Note: We don't need a NULL check here, since curr_gw never gets
306 * dereferenced. If curr_gw is NULL we also should not exit as we may
307 * have this gateway in our list (duplication check!) even though we
308 * have no currently selected gateway.
310 curr_gw = gw_get_selected_gw_node(bat_priv);
313 hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
314 if (gw_node->orig_node != orig_node)
317 bat_dbg(DBG_BATMAN, bat_priv,
318 "Gateway class of originator %pM changed from "
320 orig_node->orig, gw_node->orig_node->gw_flags,
323 gw_node->deleted = 0;
325 if (new_gwflags == NO_FLAGS) {
326 gw_node->deleted = jiffies;
327 bat_dbg(DBG_BATMAN, bat_priv,
328 "Gateway %pM removed from gateway list\n",
331 if (gw_node == curr_gw)
338 if (new_gwflags == NO_FLAGS)
341 gw_node_add(bat_priv, orig_node, new_gwflags);
345 gw_deselect(bat_priv);
350 gw_node_free_ref(curr_gw);
353 void gw_node_delete(struct bat_priv *bat_priv, struct orig_node *orig_node)
355 gw_node_update(bat_priv, orig_node, 0);
358 void gw_node_purge(struct bat_priv *bat_priv)
360 struct gw_node *gw_node, *curr_gw;
361 struct hlist_node *node, *node_tmp;
362 unsigned long timeout = 2 * PURGE_TIMEOUT * HZ;
363 char do_deselect = 0;
365 curr_gw = gw_get_selected_gw_node(bat_priv);
367 spin_lock_bh(&bat_priv->gw_list_lock);
369 hlist_for_each_entry_safe(gw_node, node, node_tmp,
370 &bat_priv->gw_list, list) {
371 if (((!gw_node->deleted) ||
372 (time_before(jiffies, gw_node->deleted + timeout))) &&
373 atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE)
376 if (curr_gw == gw_node)
379 hlist_del_rcu(&gw_node->list);
380 gw_node_free_ref(gw_node);
383 spin_unlock_bh(&bat_priv->gw_list_lock);
385 /* gw_deselect() needs to acquire the gw_list_lock */
387 gw_deselect(bat_priv);
390 gw_node_free_ref(curr_gw);
394 * fails if orig_node has no router
396 static int _write_buffer_text(struct bat_priv *bat_priv, struct seq_file *seq,
397 const struct gw_node *gw_node)
399 struct gw_node *curr_gw;
400 struct neigh_node *router;
401 int down, up, ret = -1;
403 gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up);
405 router = orig_node_get_router(gw_node->orig_node);
409 curr_gw = gw_get_selected_gw_node(bat_priv);
411 ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n",
412 (curr_gw == gw_node ? "=>" : " "),
413 gw_node->orig_node->orig,
414 router->tq_avg, router->addr,
415 router->if_incoming->net_dev->name,
416 gw_node->orig_node->gw_flags,
417 (down > 2048 ? down / 1024 : down),
418 (down > 2048 ? "MBit" : "KBit"),
419 (up > 2048 ? up / 1024 : up),
420 (up > 2048 ? "MBit" : "KBit"));
422 neigh_node_free_ref(router);
424 gw_node_free_ref(curr_gw);
429 int gw_client_seq_print_text(struct seq_file *seq, void *offset)
431 struct net_device *net_dev = (struct net_device *)seq->private;
432 struct bat_priv *bat_priv = netdev_priv(net_dev);
433 struct hard_iface *primary_if;
434 struct gw_node *gw_node;
435 struct hlist_node *node;
436 int gw_count = 0, ret = 0;
438 primary_if = primary_if_get_selected(bat_priv);
440 ret = seq_printf(seq, "BATMAN mesh %s disabled - please "
441 "specify interfaces to enable it\n",
446 if (primary_if->if_status != IF_ACTIVE) {
447 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
448 "primary interface not active\n",
453 seq_printf(seq, " %-12s (%s/%i) %17s [%10s]: gw_class ... "
454 "[B.A.T.M.A.N. adv %s%s, MainIF/MAC: %s/%pM (%s)]\n",
455 "Gateway", "#", TQ_MAX_VALUE, "Nexthop",
456 "outgoingIF", SOURCE_VERSION, REVISION_VERSION_STR,
457 primary_if->net_dev->name,
458 primary_if->net_dev->dev_addr, net_dev->name);
461 hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
462 if (gw_node->deleted)
465 /* fails if orig_node has no router */
466 if (_write_buffer_text(bat_priv, seq, gw_node) < 0)
474 seq_printf(seq, "No gateways in range ...\n");
478 hardif_free_ref(primary_if);
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(*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(*ipv6hdr)))
524 ipv6hdr = (struct ipv6hdr *)(skb->data + header_len);
525 header_len += sizeof(*ipv6hdr);
527 /* check for udp header */
528 if (ipv6hdr->nexthdr != IPPROTO_UDP)
536 if (!pskb_may_pull(skb, header_len + sizeof(*udphdr)))
538 udphdr = (struct udphdr *)(skb->data + header_len);
539 header_len += sizeof(*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);