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c6c8fea2 | 1 | /* |
64afe353 | 2 | * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
3 | * |
4 | * Marek Lindner, Simon Wunderlich | |
5 | * | |
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. | |
9 | * | |
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. | |
14 | * | |
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 | |
19 | * | |
20 | */ | |
21 | ||
22 | #include "main.h" | |
23 | #include "aggregation.h" | |
24 | #include "send.h" | |
25 | #include "routing.h" | |
26 | ||
27 | /* calculate the size of the hna information for a given packet */ | |
28 | static int hna_len(struct batman_packet *batman_packet) | |
29 | { | |
30 | return batman_packet->num_hna * ETH_ALEN; | |
31 | } | |
32 | ||
33 | /* return true if new_packet can be aggregated with forw_packet */ | |
34 | static bool can_aggregate_with(struct batman_packet *new_batman_packet, | |
35 | int packet_len, | |
36 | unsigned long send_time, | |
37 | bool directlink, | |
e6c10f43 | 38 | struct hard_iface *if_incoming, |
c6c8fea2 SE |
39 | struct forw_packet *forw_packet) |
40 | { | |
41 | struct batman_packet *batman_packet = | |
42 | (struct batman_packet *)forw_packet->skb->data; | |
43 | int aggregated_bytes = forw_packet->packet_len + packet_len; | |
44 | ||
45 | /** | |
46 | * we can aggregate the current packet to this aggregated packet | |
47 | * if: | |
48 | * | |
49 | * - the send time is within our MAX_AGGREGATION_MS time | |
50 | * - the resulting packet wont be bigger than | |
51 | * MAX_AGGREGATION_BYTES | |
52 | */ | |
53 | ||
54 | if (time_before(send_time, forw_packet->send_time) && | |
55 | time_after_eq(send_time + msecs_to_jiffies(MAX_AGGREGATION_MS), | |
56 | forw_packet->send_time) && | |
57 | (aggregated_bytes <= MAX_AGGREGATION_BYTES)) { | |
58 | ||
59 | /** | |
60 | * check aggregation compatibility | |
61 | * -> direct link packets are broadcasted on | |
62 | * their interface only | |
63 | * -> aggregate packet if the current packet is | |
64 | * a "global" packet as well as the base | |
65 | * packet | |
66 | */ | |
67 | ||
68 | /* packets without direct link flag and high TTL | |
69 | * are flooded through the net */ | |
70 | if ((!directlink) && | |
71 | (!(batman_packet->flags & DIRECTLINK)) && | |
72 | (batman_packet->ttl != 1) && | |
73 | ||
74 | /* own packets originating non-primary | |
75 | * interfaces leave only that interface */ | |
76 | ((!forw_packet->own) || | |
77 | (forw_packet->if_incoming->if_num == 0))) | |
78 | return true; | |
79 | ||
80 | /* if the incoming packet is sent via this one | |
81 | * interface only - we still can aggregate */ | |
82 | if ((directlink) && | |
83 | (new_batman_packet->ttl == 1) && | |
84 | (forw_packet->if_incoming == if_incoming) && | |
85 | ||
86 | /* packets from direct neighbors or | |
87 | * own secondary interface packets | |
88 | * (= secondary interface packets in general) */ | |
89 | (batman_packet->flags & DIRECTLINK || | |
90 | (forw_packet->own && | |
91 | forw_packet->if_incoming->if_num != 0))) | |
92 | return true; | |
93 | } | |
94 | ||
95 | return false; | |
96 | } | |
97 | ||
98 | #define atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0) | |
99 | /* create a new aggregated packet and add this packet to it */ | |
100 | static void new_aggregated_packet(unsigned char *packet_buff, int packet_len, | |
101 | unsigned long send_time, bool direct_link, | |
e6c10f43 | 102 | struct hard_iface *if_incoming, |
c6c8fea2 SE |
103 | int own_packet) |
104 | { | |
105 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
106 | struct forw_packet *forw_packet_aggr; | |
107 | unsigned char *skb_buff; | |
108 | ||
109 | /* own packet should always be scheduled */ | |
110 | if (!own_packet) { | |
111 | if (!atomic_dec_not_zero(&bat_priv->batman_queue_left)) { | |
112 | bat_dbg(DBG_BATMAN, bat_priv, | |
113 | "batman packet queue full\n"); | |
114 | return; | |
115 | } | |
116 | } | |
117 | ||
118 | forw_packet_aggr = kmalloc(sizeof(struct forw_packet), GFP_ATOMIC); | |
119 | if (!forw_packet_aggr) { | |
120 | if (!own_packet) | |
121 | atomic_inc(&bat_priv->batman_queue_left); | |
122 | return; | |
123 | } | |
124 | ||
125 | if ((atomic_read(&bat_priv->aggregated_ogms)) && | |
126 | (packet_len < MAX_AGGREGATION_BYTES)) | |
127 | forw_packet_aggr->skb = dev_alloc_skb(MAX_AGGREGATION_BYTES + | |
128 | sizeof(struct ethhdr)); | |
129 | else | |
130 | forw_packet_aggr->skb = dev_alloc_skb(packet_len + | |
131 | sizeof(struct ethhdr)); | |
132 | ||
133 | if (!forw_packet_aggr->skb) { | |
134 | if (!own_packet) | |
135 | atomic_inc(&bat_priv->batman_queue_left); | |
136 | kfree(forw_packet_aggr); | |
137 | return; | |
138 | } | |
139 | skb_reserve(forw_packet_aggr->skb, sizeof(struct ethhdr)); | |
140 | ||
141 | INIT_HLIST_NODE(&forw_packet_aggr->list); | |
142 | ||
143 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
144 | forw_packet_aggr->packet_len = packet_len; | |
145 | memcpy(skb_buff, packet_buff, packet_len); | |
146 | ||
147 | forw_packet_aggr->own = own_packet; | |
148 | forw_packet_aggr->if_incoming = if_incoming; | |
149 | forw_packet_aggr->num_packets = 0; | |
150 | forw_packet_aggr->direct_link_flags = 0; | |
151 | forw_packet_aggr->send_time = send_time; | |
152 | ||
153 | /* save packet direct link flag status */ | |
154 | if (direct_link) | |
155 | forw_packet_aggr->direct_link_flags |= 1; | |
156 | ||
157 | /* add new packet to packet list */ | |
158 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
159 | hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list); | |
160 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
161 | ||
162 | /* start timer for this packet */ | |
163 | INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, | |
164 | send_outstanding_bat_packet); | |
165 | queue_delayed_work(bat_event_workqueue, | |
166 | &forw_packet_aggr->delayed_work, | |
167 | send_time - jiffies); | |
168 | } | |
169 | ||
170 | /* aggregate a new packet into the existing aggregation */ | |
171 | static void aggregate(struct forw_packet *forw_packet_aggr, | |
172 | unsigned char *packet_buff, | |
173 | int packet_len, | |
174 | bool direct_link) | |
175 | { | |
176 | unsigned char *skb_buff; | |
177 | ||
178 | skb_buff = skb_put(forw_packet_aggr->skb, packet_len); | |
179 | memcpy(skb_buff, packet_buff, packet_len); | |
180 | forw_packet_aggr->packet_len += packet_len; | |
181 | forw_packet_aggr->num_packets++; | |
182 | ||
183 | /* save packet direct link flag status */ | |
184 | if (direct_link) | |
185 | forw_packet_aggr->direct_link_flags |= | |
186 | (1 << forw_packet_aggr->num_packets); | |
187 | } | |
188 | ||
189 | void add_bat_packet_to_list(struct bat_priv *bat_priv, | |
190 | unsigned char *packet_buff, int packet_len, | |
e6c10f43 | 191 | struct hard_iface *if_incoming, char own_packet, |
c6c8fea2 SE |
192 | unsigned long send_time) |
193 | { | |
194 | /** | |
195 | * _aggr -> pointer to the packet we want to aggregate with | |
196 | * _pos -> pointer to the position in the queue | |
197 | */ | |
198 | struct forw_packet *forw_packet_aggr = NULL, *forw_packet_pos = NULL; | |
199 | struct hlist_node *tmp_node; | |
200 | struct batman_packet *batman_packet = | |
201 | (struct batman_packet *)packet_buff; | |
202 | bool direct_link = batman_packet->flags & DIRECTLINK ? 1 : 0; | |
203 | ||
204 | /* find position for the packet in the forward queue */ | |
205 | spin_lock_bh(&bat_priv->forw_bat_list_lock); | |
206 | /* own packets are not to be aggregated */ | |
207 | if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) { | |
208 | hlist_for_each_entry(forw_packet_pos, tmp_node, | |
209 | &bat_priv->forw_bat_list, list) { | |
210 | if (can_aggregate_with(batman_packet, | |
211 | packet_len, | |
212 | send_time, | |
213 | direct_link, | |
214 | if_incoming, | |
215 | forw_packet_pos)) { | |
216 | forw_packet_aggr = forw_packet_pos; | |
217 | break; | |
218 | } | |
219 | } | |
220 | } | |
221 | ||
222 | /* nothing to aggregate with - either aggregation disabled or no | |
223 | * suitable aggregation packet found */ | |
224 | if (!forw_packet_aggr) { | |
225 | /* the following section can run without the lock */ | |
226 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
227 | ||
228 | /** | |
229 | * if we could not aggregate this packet with one of the others | |
230 | * we hold it back for a while, so that it might be aggregated | |
231 | * later on | |
232 | */ | |
233 | if ((!own_packet) && | |
234 | (atomic_read(&bat_priv->aggregated_ogms))) | |
235 | send_time += msecs_to_jiffies(MAX_AGGREGATION_MS); | |
236 | ||
237 | new_aggregated_packet(packet_buff, packet_len, | |
238 | send_time, direct_link, | |
239 | if_incoming, own_packet); | |
240 | } else { | |
241 | aggregate(forw_packet_aggr, | |
242 | packet_buff, packet_len, | |
243 | direct_link); | |
244 | spin_unlock_bh(&bat_priv->forw_bat_list_lock); | |
245 | } | |
246 | } | |
247 | ||
248 | /* unpack the aggregated packets and process them one by one */ | |
249 | void receive_aggr_bat_packet(struct ethhdr *ethhdr, unsigned char *packet_buff, | |
e6c10f43 | 250 | int packet_len, struct hard_iface *if_incoming) |
c6c8fea2 SE |
251 | { |
252 | struct batman_packet *batman_packet; | |
253 | int buff_pos = 0; | |
254 | unsigned char *hna_buff; | |
255 | ||
256 | batman_packet = (struct batman_packet *)packet_buff; | |
257 | ||
258 | do { | |
259 | /* network to host order for our 32bit seqno, and the | |
260 | orig_interval. */ | |
261 | batman_packet->seqno = ntohl(batman_packet->seqno); | |
262 | ||
263 | hna_buff = packet_buff + buff_pos + BAT_PACKET_LEN; | |
264 | receive_bat_packet(ethhdr, batman_packet, | |
265 | hna_buff, hna_len(batman_packet), | |
266 | if_incoming); | |
267 | ||
268 | buff_pos += BAT_PACKET_LEN + hna_len(batman_packet); | |
269 | batman_packet = (struct batman_packet *) | |
270 | (packet_buff + buff_pos); | |
271 | } while (aggregated_packet(buff_pos, packet_len, | |
272 | batman_packet->num_hna)); | |
273 | } |