blob: c8da6b0acc38114f740984308cdcc42ae6145534 [file] [log] [blame]
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001/* Copyright (C) 2010-2012 B.A.T.M.A.N. contributors:
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00002 *
3 * Andreas Langer
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17 * 02110-1301, USA
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000018 */
19
20#include "main.h"
21#include "unicast.h"
22#include "send.h"
23#include "soft-interface.h"
24#include "gateway_client.h"
25#include "originator.h"
26#include "hash.h"
27#include "translation-table.h"
28#include "routing.h"
29#include "hard-interface.h"
30
31
Sven Eckelmann03544402012-05-16 20:23:17 +020032static struct sk_buff *
33batadv_frag_merge_packet(struct list_head *head,
34 struct frag_packet_list_entry *tfp,
35 struct sk_buff *skb)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000036{
37 struct unicast_frag_packet *up =
38 (struct unicast_frag_packet *)skb->data;
39 struct sk_buff *tmp_skb;
40 struct unicast_packet *unicast_packet;
Sven Eckelmann704509b2011-05-14 23:14:54 +020041 int hdr_len = sizeof(*unicast_packet);
42 int uni_diff = sizeof(*up) - hdr_len;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000043
44 /* set skb to the first part and tmp_skb to the second part */
45 if (up->flags & UNI_FRAG_HEAD) {
46 tmp_skb = tfp->skb;
47 } else {
48 tmp_skb = skb;
49 skb = tfp->skb;
50 }
51
Sven Eckelmann531c9da2011-02-06 23:26:43 +000052 if (skb_linearize(skb) < 0 || skb_linearize(tmp_skb) < 0)
53 goto err;
54
Sven Eckelmann704509b2011-05-14 23:14:54 +020055 skb_pull(tmp_skb, sizeof(*up));
Sven Eckelmann531c9da2011-02-06 23:26:43 +000056 if (pskb_expand_head(skb, 0, tmp_skb->len, GFP_ATOMIC) < 0)
57 goto err;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000058
59 /* move free entry to end */
60 tfp->skb = NULL;
61 tfp->seqno = 0;
62 list_move_tail(&tfp->list, head);
63
64 memcpy(skb_put(skb, tmp_skb->len), tmp_skb->data, tmp_skb->len);
65 kfree_skb(tmp_skb);
66
67 memmove(skb->data + uni_diff, skb->data, hdr_len);
Sven Eckelmann40e0c4f2012-03-07 09:07:48 +010068 unicast_packet = (struct unicast_packet *)skb_pull(skb, uni_diff);
Sven Eckelmann76543d12011-11-20 15:47:38 +010069 unicast_packet->header.packet_type = BAT_UNICAST;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000070
71 return skb;
Sven Eckelmann531c9da2011-02-06 23:26:43 +000072
73err:
74 /* free buffered skb, skb will be freed later */
75 kfree_skb(tfp->skb);
76 return NULL;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000077}
78
Sven Eckelmann03544402012-05-16 20:23:17 +020079static void batadv_frag_create_entry(struct list_head *head,
80 struct sk_buff *skb)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000081{
82 struct frag_packet_list_entry *tfp;
83 struct unicast_frag_packet *up =
84 (struct unicast_frag_packet *)skb->data;
85
86 /* free and oldest packets stand at the end */
87 tfp = list_entry((head)->prev, typeof(*tfp), list);
88 kfree_skb(tfp->skb);
89
90 tfp->seqno = ntohs(up->seqno);
91 tfp->skb = skb;
92 list_move(&tfp->list, head);
93 return;
94}
95
Sven Eckelmann03544402012-05-16 20:23:17 +020096static int batadv_frag_create_buffer(struct list_head *head)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000097{
98 int i;
99 struct frag_packet_list_entry *tfp;
100
101 for (i = 0; i < FRAG_BUFFER_SIZE; i++) {
Sven Eckelmann704509b2011-05-14 23:14:54 +0200102 tfp = kmalloc(sizeof(*tfp), GFP_ATOMIC);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000103 if (!tfp) {
Sven Eckelmann88ed1e772012-05-12 02:09:40 +0200104 batadv_frag_list_free(head);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000105 return -ENOMEM;
106 }
107 tfp->skb = NULL;
108 tfp->seqno = 0;
109 INIT_LIST_HEAD(&tfp->list);
110 list_add(&tfp->list, head);
111 }
112
113 return 0;
114}
115
Sven Eckelmann03544402012-05-16 20:23:17 +0200116static struct frag_packet_list_entry *
117batadv_frag_search_packet(struct list_head *head,
118 const struct unicast_frag_packet *up)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000119{
120 struct frag_packet_list_entry *tfp;
121 struct unicast_frag_packet *tmp_up = NULL;
122 uint16_t search_seqno;
123
124 if (up->flags & UNI_FRAG_HEAD)
125 search_seqno = ntohs(up->seqno)+1;
126 else
127 search_seqno = ntohs(up->seqno)-1;
128
129 list_for_each_entry(tfp, head, list) {
130
131 if (!tfp->skb)
132 continue;
133
134 if (tfp->seqno == ntohs(up->seqno))
135 goto mov_tail;
136
137 tmp_up = (struct unicast_frag_packet *)tfp->skb->data;
138
139 if (tfp->seqno == search_seqno) {
140
141 if ((tmp_up->flags & UNI_FRAG_HEAD) !=
142 (up->flags & UNI_FRAG_HEAD))
143 return tfp;
144 else
145 goto mov_tail;
146 }
147 }
148 return NULL;
149
150mov_tail:
151 list_move_tail(&tfp->list, head);
152 return NULL;
153}
154
Sven Eckelmann88ed1e772012-05-12 02:09:40 +0200155void batadv_frag_list_free(struct list_head *head)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000156{
157 struct frag_packet_list_entry *pf, *tmp_pf;
158
159 if (!list_empty(head)) {
160
161 list_for_each_entry_safe(pf, tmp_pf, head, list) {
162 kfree_skb(pf->skb);
163 list_del(&pf->list);
164 kfree(pf);
165 }
166 }
167 return;
168}
169
170/* frag_reassemble_skb():
171 * returns NET_RX_DROP if the operation failed - skb is left intact
172 * returns NET_RX_SUCCESS if the fragment was buffered (skb_new will be NULL)
173 * or the skb could be reassembled (skb_new will point to the new packet and
174 * skb was freed)
175 */
Sven Eckelmann88ed1e772012-05-12 02:09:40 +0200176int batadv_frag_reassemble_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
177 struct sk_buff **new_skb)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000178{
179 struct orig_node *orig_node;
180 struct frag_packet_list_entry *tmp_frag_entry;
181 int ret = NET_RX_DROP;
182 struct unicast_frag_packet *unicast_packet =
183 (struct unicast_frag_packet *)skb->data;
184
185 *new_skb = NULL;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000186
Sven Eckelmannda641192012-05-12 13:48:56 +0200187 orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->orig);
Marek Lindner7aadf882011-02-18 12:28:09 +0000188 if (!orig_node)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000189 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000190
191 orig_node->last_frag_packet = jiffies;
192
193 if (list_empty(&orig_node->frag_list) &&
Sven Eckelmann03544402012-05-16 20:23:17 +0200194 batadv_frag_create_buffer(&orig_node->frag_list)) {
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000195 pr_debug("couldn't create frag buffer\n");
196 goto out;
197 }
198
Sven Eckelmann03544402012-05-16 20:23:17 +0200199 tmp_frag_entry = batadv_frag_search_packet(&orig_node->frag_list,
200 unicast_packet);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000201
202 if (!tmp_frag_entry) {
Sven Eckelmann03544402012-05-16 20:23:17 +0200203 batadv_frag_create_entry(&orig_node->frag_list, skb);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000204 ret = NET_RX_SUCCESS;
205 goto out;
206 }
207
Sven Eckelmann03544402012-05-16 20:23:17 +0200208 *new_skb = batadv_frag_merge_packet(&orig_node->frag_list,
209 tmp_frag_entry, skb);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000210 /* if not, merge failed */
211 if (*new_skb)
212 ret = NET_RX_SUCCESS;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000213
Marek Lindner7aadf882011-02-18 12:28:09 +0000214out:
215 if (orig_node)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200216 batadv_orig_node_free_ref(orig_node);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000217 return ret;
218}
219
Sven Eckelmann88ed1e772012-05-12 02:09:40 +0200220int batadv_frag_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
221 struct hard_iface *hard_iface, const uint8_t dstaddr[])
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000222{
223 struct unicast_packet tmp_uc, *unicast_packet;
Marek Lindner32ae9b22011-04-20 15:40:58 +0200224 struct hard_iface *primary_if;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000225 struct sk_buff *frag_skb;
226 struct unicast_frag_packet *frag1, *frag2;
Sven Eckelmann704509b2011-05-14 23:14:54 +0200227 int uc_hdr_len = sizeof(*unicast_packet);
228 int ucf_hdr_len = sizeof(*frag1);
Sven Eckelmann5c77d8b2011-01-25 21:59:26 +0000229 int data_len = skb->len - uc_hdr_len;
Marek Lindner32ae9b22011-04-20 15:40:58 +0200230 int large_tail = 0, ret = NET_RX_DROP;
Sven Eckelmannc2f7f0e2011-02-10 14:33:56 +0000231 uint16_t seqno;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000232
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200233 primary_if = batadv_primary_if_get_selected(bat_priv);
Marek Lindner32ae9b22011-04-20 15:40:58 +0200234 if (!primary_if)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000235 goto dropped;
236
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000237 frag_skb = dev_alloc_skb(data_len - (data_len / 2) + ucf_hdr_len);
Jesper Juhled7809d2011-01-13 21:53:38 +0100238 if (!frag_skb)
239 goto dropped;
Sven Eckelmann5c77d8b2011-01-25 21:59:26 +0000240 skb_reserve(frag_skb, ucf_hdr_len);
Jesper Juhled7809d2011-01-13 21:53:38 +0100241
Sven Eckelmann40e0c4f2012-03-07 09:07:48 +0100242 unicast_packet = (struct unicast_packet *)skb->data;
Jesper Juhled7809d2011-01-13 21:53:38 +0100243 memcpy(&tmp_uc, unicast_packet, uc_hdr_len);
Sven Eckelmann5c77d8b2011-01-25 21:59:26 +0000244 skb_split(skb, frag_skb, data_len / 2 + uc_hdr_len);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000245
Sven Eckelmann04b482a2012-05-12 02:09:38 +0200246 if (batadv_skb_head_push(skb, ucf_hdr_len - uc_hdr_len) < 0 ||
247 batadv_skb_head_push(frag_skb, ucf_hdr_len) < 0)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000248 goto drop_frag;
249
250 frag1 = (struct unicast_frag_packet *)skb->data;
251 frag2 = (struct unicast_frag_packet *)frag_skb->data;
252
Sven Eckelmann704509b2011-05-14 23:14:54 +0200253 memcpy(frag1, &tmp_uc, sizeof(tmp_uc));
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000254
Sven Eckelmann76543d12011-11-20 15:47:38 +0100255 frag1->header.ttl--;
Sven Eckelmann7e071c72012-06-03 22:19:13 +0200256 frag1->header.version = BATADV_COMPAT_VERSION;
Sven Eckelmann76543d12011-11-20 15:47:38 +0100257 frag1->header.packet_type = BAT_UNICAST_FRAG;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000258
Marek Lindner32ae9b22011-04-20 15:40:58 +0200259 memcpy(frag1->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
Sven Eckelmann704509b2011-05-14 23:14:54 +0200260 memcpy(frag2, frag1, sizeof(*frag2));
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000261
Sven Eckelmannae361ce2011-01-25 22:02:31 +0000262 if (data_len & 1)
263 large_tail = UNI_FRAG_LARGETAIL;
264
265 frag1->flags = UNI_FRAG_HEAD | large_tail;
266 frag2->flags = large_tail;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000267
Marek Lindnere6c10f42011-02-18 12:33:20 +0000268 seqno = atomic_add_return(2, &hard_iface->frag_seqno);
Sven Eckelmannc2f7f0e2011-02-10 14:33:56 +0000269 frag1->seqno = htons(seqno - 1);
270 frag2->seqno = htons(seqno);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000271
Sven Eckelmann9455e342012-05-12 02:09:37 +0200272 batadv_send_skb_packet(skb, hard_iface, dstaddr);
273 batadv_send_skb_packet(frag_skb, hard_iface, dstaddr);
Marek Lindner32ae9b22011-04-20 15:40:58 +0200274 ret = NET_RX_SUCCESS;
275 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000276
277drop_frag:
278 kfree_skb(frag_skb);
279dropped:
280 kfree_skb(skb);
Marek Lindner32ae9b22011-04-20 15:40:58 +0200281out:
282 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200283 batadv_hardif_free_ref(primary_if);
Marek Lindner32ae9b22011-04-20 15:40:58 +0200284 return ret;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000285}
286
Sven Eckelmann88ed1e772012-05-12 02:09:40 +0200287int batadv_unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000288{
289 struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
290 struct unicast_packet *unicast_packet;
Marek Lindner7b36e8e2011-02-18 12:28:10 +0000291 struct orig_node *orig_node;
Marek Lindner44524fc2011-02-10 14:33:53 +0000292 struct neigh_node *neigh_node;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000293 int data_len = skb->len;
Marek Lindner44524fc2011-02-10 14:33:53 +0000294 int ret = 1;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000295
296 /* get routing information */
Linus Lüssing43c70ad2011-02-13 21:13:04 +0000297 if (is_multicast_ether_addr(ethhdr->h_dest)) {
Sven Eckelmann7cf06bc2012-05-12 02:09:29 +0200298 orig_node = batadv_gw_get_selected_orig(bat_priv);
Linus Lüssing43c70ad2011-02-13 21:13:04 +0000299 if (orig_node)
Marek Lindner44524fc2011-02-10 14:33:53 +0000300 goto find_router;
301 }
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000302
Antonio Quartulli3d393e42011-07-07 15:35:37 +0200303 /* check for tt host - increases orig_node refcount.
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200304 * returns NULL in case of AP isolation
305 */
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200306 orig_node = batadv_transtable_search(bat_priv, ethhdr->h_source,
307 ethhdr->h_dest);
Marek Lindner44524fc2011-02-10 14:33:53 +0000308find_router:
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200309 /* find_router():
Marek Lindnerd0072602011-01-19 20:01:44 +0000310 * - if orig_node is NULL it returns NULL
311 * - increases neigh_nodes refcount if found.
312 */
Sven Eckelmann30d3c512012-05-12 02:09:36 +0200313 neigh_node = batadv_find_router(bat_priv, orig_node, NULL);
Marek Lindner44524fc2011-02-10 14:33:53 +0000314 if (!neigh_node)
Marek Lindnerd0072602011-01-19 20:01:44 +0000315 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000316
Sven Eckelmann04b482a2012-05-12 02:09:38 +0200317 if (batadv_skb_head_push(skb, sizeof(*unicast_packet)) < 0)
Marek Lindnerd0072602011-01-19 20:01:44 +0000318 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000319
320 unicast_packet = (struct unicast_packet *)skb->data;
321
Sven Eckelmann7e071c72012-06-03 22:19:13 +0200322 unicast_packet->header.version = BATADV_COMPAT_VERSION;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000323 /* batman packet type: unicast */
Sven Eckelmann76543d12011-11-20 15:47:38 +0100324 unicast_packet->header.packet_type = BAT_UNICAST;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000325 /* set unicast ttl */
Sven Eckelmann76543d12011-11-20 15:47:38 +0100326 unicast_packet->header.ttl = TTL;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000327 /* copy the destination for faster routing */
328 memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
Antonio Quartullia73105b2011-04-27 14:27:44 +0200329 /* set the destination tt version number */
330 unicast_packet->ttvn =
331 (uint8_t)atomic_read(&orig_node->last_ttvn);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000332
Antonio Quartulli3275e7c2012-03-16 18:03:28 +0100333 /* inform the destination node that we are still missing a correct route
334 * for this client. The destination will receive this packet and will
335 * try to reroute it because the ttvn contained in the header is less
336 * than the current one
337 */
Sven Eckelmann08c36d32012-05-12 02:09:39 +0200338 if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest))
Antonio Quartulli3275e7c2012-03-16 18:03:28 +0100339 unicast_packet->ttvn = unicast_packet->ttvn - 1;
340
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000341 if (atomic_read(&bat_priv->fragmentation) &&
Sven Eckelmann704509b2011-05-14 23:14:54 +0200342 data_len + sizeof(*unicast_packet) >
Marek Lindnerd0072602011-01-19 20:01:44 +0000343 neigh_node->if_incoming->net_dev->mtu) {
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000344 /* send frag skb decreases ttl */
Sven Eckelmann76543d12011-11-20 15:47:38 +0100345 unicast_packet->header.ttl++;
Sven Eckelmann88ed1e772012-05-12 02:09:40 +0200346 ret = batadv_frag_send_skb(skb, bat_priv,
347 neigh_node->if_incoming,
348 neigh_node->addr);
Marek Lindner44524fc2011-02-10 14:33:53 +0000349 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000350 }
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000351
Sven Eckelmann9455e342012-05-12 02:09:37 +0200352 batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
Marek Lindner44524fc2011-02-10 14:33:53 +0000353 ret = 0;
354 goto out;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000355
Marek Lindner44524fc2011-02-10 14:33:53 +0000356out:
357 if (neigh_node)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200358 batadv_neigh_node_free_ref(neigh_node);
Marek Lindner44524fc2011-02-10 14:33:53 +0000359 if (orig_node)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200360 batadv_orig_node_free_ref(orig_node);
Marek Lindner44524fc2011-02-10 14:33:53 +0000361 if (ret == 1)
362 kfree_skb(skb);
363 return ret;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000364}