Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc
[cris-mirror.git] / net / batman-adv / send.c
blobd49e54d932af7e302fd8f862bfccfb0727708386
1 /*
2 * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
4 * Marek Lindner, Simon Wunderlich
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
18 * 02110-1301, USA
22 #include "main.h"
23 #include "send.h"
24 #include "routing.h"
25 #include "translation-table.h"
26 #include "soft-interface.h"
27 #include "hard-interface.h"
28 #include "vis.h"
29 #include "aggregation.h"
30 #include "gateway_common.h"
31 #include "originator.h"
33 static void send_outstanding_bcast_packet(struct work_struct *work);
35 /* apply hop penalty for a normal link */
36 static uint8_t hop_penalty(const uint8_t tq, struct bat_priv *bat_priv)
38 int hop_penalty = atomic_read(&bat_priv->hop_penalty);
39 return (tq * (TQ_MAX_VALUE - hop_penalty)) / (TQ_MAX_VALUE);
42 /* when do we schedule our own packet to be sent */
43 static unsigned long own_send_time(struct bat_priv *bat_priv)
45 return jiffies + msecs_to_jiffies(
46 atomic_read(&bat_priv->orig_interval) -
47 JITTER + (random32() % 2*JITTER));
50 /* when do we schedule a forwarded packet to be sent */
51 static unsigned long forward_send_time(void)
53 return jiffies + msecs_to_jiffies(random32() % (JITTER/2));
56 /* send out an already prepared packet to the given address via the
57 * specified batman interface */
58 int send_skb_packet(struct sk_buff *skb,
59 struct hard_iface *hard_iface,
60 uint8_t *dst_addr)
62 struct ethhdr *ethhdr;
64 if (hard_iface->if_status != IF_ACTIVE)
65 goto send_skb_err;
67 if (unlikely(!hard_iface->net_dev))
68 goto send_skb_err;
70 if (!(hard_iface->net_dev->flags & IFF_UP)) {
71 pr_warning("Interface %s is not up - can't send packet via "
72 "that interface!\n", hard_iface->net_dev->name);
73 goto send_skb_err;
76 /* push to the ethernet header. */
77 if (my_skb_head_push(skb, sizeof(struct ethhdr)) < 0)
78 goto send_skb_err;
80 skb_reset_mac_header(skb);
82 ethhdr = (struct ethhdr *) skb_mac_header(skb);
83 memcpy(ethhdr->h_source, hard_iface->net_dev->dev_addr, ETH_ALEN);
84 memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN);
85 ethhdr->h_proto = __constant_htons(ETH_P_BATMAN);
87 skb_set_network_header(skb, ETH_HLEN);
88 skb->priority = TC_PRIO_CONTROL;
89 skb->protocol = __constant_htons(ETH_P_BATMAN);
91 skb->dev = hard_iface->net_dev;
93 /* dev_queue_xmit() returns a negative result on error. However on
94 * congestion and traffic shaping, it drops and returns NET_XMIT_DROP
95 * (which is > 0). This will not be treated as an error. */
97 return dev_queue_xmit(skb);
98 send_skb_err:
99 kfree_skb(skb);
100 return NET_XMIT_DROP;
103 /* Send a packet to a given interface */
104 static void send_packet_to_if(struct forw_packet *forw_packet,
105 struct hard_iface *hard_iface)
107 struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
108 char *fwd_str;
109 uint8_t packet_num;
110 int16_t buff_pos;
111 struct batman_packet *batman_packet;
112 struct sk_buff *skb;
114 if (hard_iface->if_status != IF_ACTIVE)
115 return;
117 packet_num = 0;
118 buff_pos = 0;
119 batman_packet = (struct batman_packet *)forw_packet->skb->data;
121 /* adjust all flags and log packets */
122 while (aggregated_packet(buff_pos,
123 forw_packet->packet_len,
124 batman_packet->num_hna)) {
126 /* we might have aggregated direct link packets with an
127 * ordinary base packet */
128 if ((forw_packet->direct_link_flags & (1 << packet_num)) &&
129 (forw_packet->if_incoming == hard_iface))
130 batman_packet->flags |= DIRECTLINK;
131 else
132 batman_packet->flags &= ~DIRECTLINK;
134 fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ?
135 "Sending own" :
136 "Forwarding"));
137 bat_dbg(DBG_BATMAN, bat_priv,
138 "%s %spacket (originator %pM, seqno %d, TQ %d, TTL %d,"
139 " IDF %s) on interface %s [%pM]\n",
140 fwd_str, (packet_num > 0 ? "aggregated " : ""),
141 batman_packet->orig, ntohl(batman_packet->seqno),
142 batman_packet->tq, batman_packet->ttl,
143 (batman_packet->flags & DIRECTLINK ?
144 "on" : "off"),
145 hard_iface->net_dev->name,
146 hard_iface->net_dev->dev_addr);
148 buff_pos += sizeof(struct batman_packet) +
149 (batman_packet->num_hna * ETH_ALEN);
150 packet_num++;
151 batman_packet = (struct batman_packet *)
152 (forw_packet->skb->data + buff_pos);
155 /* create clone because function is called more than once */
156 skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
157 if (skb)
158 send_skb_packet(skb, hard_iface, broadcast_addr);
161 /* send a batman packet */
162 static void send_packet(struct forw_packet *forw_packet)
164 struct hard_iface *hard_iface;
165 struct net_device *soft_iface;
166 struct bat_priv *bat_priv;
167 struct batman_packet *batman_packet =
168 (struct batman_packet *)(forw_packet->skb->data);
169 unsigned char directlink = (batman_packet->flags & DIRECTLINK ? 1 : 0);
171 if (!forw_packet->if_incoming) {
172 pr_err("Error - can't forward packet: incoming iface not "
173 "specified\n");
174 return;
177 soft_iface = forw_packet->if_incoming->soft_iface;
178 bat_priv = netdev_priv(soft_iface);
180 if (forw_packet->if_incoming->if_status != IF_ACTIVE)
181 return;
183 /* multihomed peer assumed */
184 /* non-primary OGMs are only broadcasted on their interface */
185 if ((directlink && (batman_packet->ttl == 1)) ||
186 (forw_packet->own && (forw_packet->if_incoming->if_num > 0))) {
188 /* FIXME: what about aggregated packets ? */
189 bat_dbg(DBG_BATMAN, bat_priv,
190 "%s packet (originator %pM, seqno %d, TTL %d) "
191 "on interface %s [%pM]\n",
192 (forw_packet->own ? "Sending own" : "Forwarding"),
193 batman_packet->orig, ntohl(batman_packet->seqno),
194 batman_packet->ttl,
195 forw_packet->if_incoming->net_dev->name,
196 forw_packet->if_incoming->net_dev->dev_addr);
198 /* skb is only used once and than forw_packet is free'd */
199 send_skb_packet(forw_packet->skb, forw_packet->if_incoming,
200 broadcast_addr);
201 forw_packet->skb = NULL;
203 return;
206 /* broadcast on every interface */
207 rcu_read_lock();
208 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
209 if (hard_iface->soft_iface != soft_iface)
210 continue;
212 send_packet_to_if(forw_packet, hard_iface);
214 rcu_read_unlock();
217 static void rebuild_batman_packet(struct bat_priv *bat_priv,
218 struct hard_iface *hard_iface)
220 int new_len;
221 unsigned char *new_buff;
222 struct batman_packet *batman_packet;
224 new_len = sizeof(struct batman_packet) +
225 (bat_priv->num_local_hna * ETH_ALEN);
226 new_buff = kmalloc(new_len, GFP_ATOMIC);
228 /* keep old buffer if kmalloc should fail */
229 if (new_buff) {
230 memcpy(new_buff, hard_iface->packet_buff,
231 sizeof(struct batman_packet));
232 batman_packet = (struct batman_packet *)new_buff;
234 batman_packet->num_hna = hna_local_fill_buffer(bat_priv,
235 new_buff + sizeof(struct batman_packet),
236 new_len - sizeof(struct batman_packet));
238 kfree(hard_iface->packet_buff);
239 hard_iface->packet_buff = new_buff;
240 hard_iface->packet_len = new_len;
244 void schedule_own_packet(struct hard_iface *hard_iface)
246 struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
247 unsigned long send_time;
248 struct batman_packet *batman_packet;
249 int vis_server;
251 if ((hard_iface->if_status == IF_NOT_IN_USE) ||
252 (hard_iface->if_status == IF_TO_BE_REMOVED))
253 return;
255 vis_server = atomic_read(&bat_priv->vis_mode);
258 * the interface gets activated here to avoid race conditions between
259 * the moment of activating the interface in
260 * hardif_activate_interface() where the originator mac is set and
261 * outdated packets (especially uninitialized mac addresses) in the
262 * packet queue
264 if (hard_iface->if_status == IF_TO_BE_ACTIVATED)
265 hard_iface->if_status = IF_ACTIVE;
267 /* if local hna has changed and interface is a primary interface */
268 if ((atomic_read(&bat_priv->hna_local_changed)) &&
269 (hard_iface == bat_priv->primary_if))
270 rebuild_batman_packet(bat_priv, hard_iface);
273 * NOTE: packet_buff might just have been re-allocated in
274 * rebuild_batman_packet()
276 batman_packet = (struct batman_packet *)hard_iface->packet_buff;
278 /* change sequence number to network order */
279 batman_packet->seqno =
280 htonl((uint32_t)atomic_read(&hard_iface->seqno));
282 if (vis_server == VIS_TYPE_SERVER_SYNC)
283 batman_packet->flags |= VIS_SERVER;
284 else
285 batman_packet->flags &= ~VIS_SERVER;
287 if ((hard_iface == bat_priv->primary_if) &&
288 (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER))
289 batman_packet->gw_flags =
290 (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
291 else
292 batman_packet->gw_flags = 0;
294 atomic_inc(&hard_iface->seqno);
296 slide_own_bcast_window(hard_iface);
297 send_time = own_send_time(bat_priv);
298 add_bat_packet_to_list(bat_priv,
299 hard_iface->packet_buff,
300 hard_iface->packet_len,
301 hard_iface, 1, send_time);
304 void schedule_forward_packet(struct orig_node *orig_node,
305 struct ethhdr *ethhdr,
306 struct batman_packet *batman_packet,
307 uint8_t directlink, int hna_buff_len,
308 struct hard_iface *if_incoming)
310 struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
311 unsigned char in_tq, in_ttl, tq_avg = 0;
312 unsigned long send_time;
314 if (batman_packet->ttl <= 1) {
315 bat_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n");
316 return;
319 in_tq = batman_packet->tq;
320 in_ttl = batman_packet->ttl;
322 batman_packet->ttl--;
323 memcpy(batman_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
325 /* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast
326 * of our best tq value */
327 if ((orig_node->router) && (orig_node->router->tq_avg != 0)) {
329 /* rebroadcast ogm of best ranking neighbor as is */
330 if (!compare_eth(orig_node->router->addr, ethhdr->h_source)) {
331 batman_packet->tq = orig_node->router->tq_avg;
333 if (orig_node->router->last_ttl)
334 batman_packet->ttl = orig_node->router->last_ttl
335 - 1;
338 tq_avg = orig_node->router->tq_avg;
341 /* apply hop penalty */
342 batman_packet->tq = hop_penalty(batman_packet->tq, bat_priv);
344 bat_dbg(DBG_BATMAN, bat_priv,
345 "Forwarding packet: tq_orig: %i, tq_avg: %i, "
346 "tq_forw: %i, ttl_orig: %i, ttl_forw: %i\n",
347 in_tq, tq_avg, batman_packet->tq, in_ttl - 1,
348 batman_packet->ttl);
350 batman_packet->seqno = htonl(batman_packet->seqno);
352 /* switch of primaries first hop flag when forwarding */
353 batman_packet->flags &= ~PRIMARIES_FIRST_HOP;
354 if (directlink)
355 batman_packet->flags |= DIRECTLINK;
356 else
357 batman_packet->flags &= ~DIRECTLINK;
359 send_time = forward_send_time();
360 add_bat_packet_to_list(bat_priv,
361 (unsigned char *)batman_packet,
362 sizeof(struct batman_packet) + hna_buff_len,
363 if_incoming, 0, send_time);
366 static void forw_packet_free(struct forw_packet *forw_packet)
368 if (forw_packet->skb)
369 kfree_skb(forw_packet->skb);
370 kfree(forw_packet);
373 static void _add_bcast_packet_to_list(struct bat_priv *bat_priv,
374 struct forw_packet *forw_packet,
375 unsigned long send_time)
377 INIT_HLIST_NODE(&forw_packet->list);
379 /* add new packet to packet list */
380 spin_lock_bh(&bat_priv->forw_bcast_list_lock);
381 hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list);
382 spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
384 /* start timer for this packet */
385 INIT_DELAYED_WORK(&forw_packet->delayed_work,
386 send_outstanding_bcast_packet);
387 queue_delayed_work(bat_event_workqueue, &forw_packet->delayed_work,
388 send_time);
391 #define atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0)
392 /* add a broadcast packet to the queue and setup timers. broadcast packets
393 * are sent multiple times to increase probability for beeing received.
395 * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on
396 * errors.
398 * The skb is not consumed, so the caller should make sure that the
399 * skb is freed. */
400 int add_bcast_packet_to_list(struct bat_priv *bat_priv, struct sk_buff *skb)
402 struct forw_packet *forw_packet;
403 struct bcast_packet *bcast_packet;
405 if (!atomic_dec_not_zero(&bat_priv->bcast_queue_left)) {
406 bat_dbg(DBG_BATMAN, bat_priv, "bcast packet queue full\n");
407 goto out;
410 if (!bat_priv->primary_if)
411 goto out;
413 forw_packet = kmalloc(sizeof(struct forw_packet), GFP_ATOMIC);
415 if (!forw_packet)
416 goto out_and_inc;
418 skb = skb_copy(skb, GFP_ATOMIC);
419 if (!skb)
420 goto packet_free;
422 /* as we have a copy now, it is safe to decrease the TTL */
423 bcast_packet = (struct bcast_packet *)skb->data;
424 bcast_packet->ttl--;
426 skb_reset_mac_header(skb);
428 forw_packet->skb = skb;
429 forw_packet->if_incoming = bat_priv->primary_if;
431 /* how often did we send the bcast packet ? */
432 forw_packet->num_packets = 0;
434 _add_bcast_packet_to_list(bat_priv, forw_packet, 1);
435 return NETDEV_TX_OK;
437 packet_free:
438 kfree(forw_packet);
439 out_and_inc:
440 atomic_inc(&bat_priv->bcast_queue_left);
441 out:
442 return NETDEV_TX_BUSY;
445 static void send_outstanding_bcast_packet(struct work_struct *work)
447 struct hard_iface *hard_iface;
448 struct delayed_work *delayed_work =
449 container_of(work, struct delayed_work, work);
450 struct forw_packet *forw_packet =
451 container_of(delayed_work, struct forw_packet, delayed_work);
452 struct sk_buff *skb1;
453 struct net_device *soft_iface = forw_packet->if_incoming->soft_iface;
454 struct bat_priv *bat_priv = netdev_priv(soft_iface);
456 spin_lock_bh(&bat_priv->forw_bcast_list_lock);
457 hlist_del(&forw_packet->list);
458 spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
460 if (atomic_read(&bat_priv->mesh_state) == MESH_DEACTIVATING)
461 goto out;
463 /* rebroadcast packet */
464 rcu_read_lock();
465 list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
466 if (hard_iface->soft_iface != soft_iface)
467 continue;
469 /* send a copy of the saved skb */
470 skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
471 if (skb1)
472 send_skb_packet(skb1, hard_iface, broadcast_addr);
474 rcu_read_unlock();
476 forw_packet->num_packets++;
478 /* if we still have some more bcasts to send */
479 if (forw_packet->num_packets < 3) {
480 _add_bcast_packet_to_list(bat_priv, forw_packet,
481 ((5 * HZ) / 1000));
482 return;
485 out:
486 forw_packet_free(forw_packet);
487 atomic_inc(&bat_priv->bcast_queue_left);
490 void send_outstanding_bat_packet(struct work_struct *work)
492 struct delayed_work *delayed_work =
493 container_of(work, struct delayed_work, work);
494 struct forw_packet *forw_packet =
495 container_of(delayed_work, struct forw_packet, delayed_work);
496 struct bat_priv *bat_priv;
498 bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface);
499 spin_lock_bh(&bat_priv->forw_bat_list_lock);
500 hlist_del(&forw_packet->list);
501 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
503 if (atomic_read(&bat_priv->mesh_state) == MESH_DEACTIVATING)
504 goto out;
506 send_packet(forw_packet);
509 * we have to have at least one packet in the queue
510 * to determine the queues wake up time unless we are
511 * shutting down
513 if (forw_packet->own)
514 schedule_own_packet(forw_packet->if_incoming);
516 out:
517 /* don't count own packet */
518 if (!forw_packet->own)
519 atomic_inc(&bat_priv->batman_queue_left);
521 forw_packet_free(forw_packet);
524 void purge_outstanding_packets(struct bat_priv *bat_priv,
525 struct hard_iface *hard_iface)
527 struct forw_packet *forw_packet;
528 struct hlist_node *tmp_node, *safe_tmp_node;
530 if (hard_iface)
531 bat_dbg(DBG_BATMAN, bat_priv,
532 "purge_outstanding_packets(): %s\n",
533 hard_iface->net_dev->name);
534 else
535 bat_dbg(DBG_BATMAN, bat_priv,
536 "purge_outstanding_packets()\n");
538 /* free bcast list */
539 spin_lock_bh(&bat_priv->forw_bcast_list_lock);
540 hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
541 &bat_priv->forw_bcast_list, list) {
544 * if purge_outstanding_packets() was called with an argmument
545 * we delete only packets belonging to the given interface
547 if ((hard_iface) &&
548 (forw_packet->if_incoming != hard_iface))
549 continue;
551 spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
554 * send_outstanding_bcast_packet() will lock the list to
555 * delete the item from the list
557 cancel_delayed_work_sync(&forw_packet->delayed_work);
558 spin_lock_bh(&bat_priv->forw_bcast_list_lock);
560 spin_unlock_bh(&bat_priv->forw_bcast_list_lock);
562 /* free batman packet list */
563 spin_lock_bh(&bat_priv->forw_bat_list_lock);
564 hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
565 &bat_priv->forw_bat_list, list) {
568 * if purge_outstanding_packets() was called with an argmument
569 * we delete only packets belonging to the given interface
571 if ((hard_iface) &&
572 (forw_packet->if_incoming != hard_iface))
573 continue;
575 spin_unlock_bh(&bat_priv->forw_bat_list_lock);
578 * send_outstanding_bat_packet() will lock the list to
579 * delete the item from the list
581 cancel_delayed_work_sync(&forw_packet->delayed_work);
582 spin_lock_bh(&bat_priv->forw_bat_list_lock);
584 spin_unlock_bh(&bat_priv->forw_bat_list_lock);