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0b873931 | 1 | /* Copyright (C) 2010-2013 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
2 | * |
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 | |
c6c8fea2 SE |
18 | */ |
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 | ||
0354440b SE |
32 | static struct sk_buff * |
33 | batadv_frag_merge_packet(struct list_head *head, | |
56303d34 | 34 | struct batadv_frag_packet_list_entry *tfp, |
0354440b | 35 | struct sk_buff *skb) |
c6c8fea2 | 36 | { |
96412690 | 37 | struct batadv_unicast_frag_packet *up; |
c6c8fea2 | 38 | struct sk_buff *tmp_skb; |
96412690 | 39 | struct batadv_unicast_packet *unicast_packet; |
704509b8 SE |
40 | int hdr_len = sizeof(*unicast_packet); |
41 | int uni_diff = sizeof(*up) - hdr_len; | |
c67893d1 | 42 | uint8_t *packet_pos; |
c6c8fea2 | 43 | |
96412690 | 44 | up = (struct batadv_unicast_frag_packet *)skb->data; |
c6c8fea2 | 45 | /* set skb to the first part and tmp_skb to the second part */ |
acd34afa | 46 | if (up->flags & BATADV_UNI_FRAG_HEAD) { |
c6c8fea2 SE |
47 | tmp_skb = tfp->skb; |
48 | } else { | |
49 | tmp_skb = skb; | |
50 | skb = tfp->skb; | |
51 | } | |
52 | ||
531c9da8 SE |
53 | if (skb_linearize(skb) < 0 || skb_linearize(tmp_skb) < 0) |
54 | goto err; | |
55 | ||
704509b8 | 56 | skb_pull(tmp_skb, sizeof(*up)); |
531c9da8 SE |
57 | if (pskb_expand_head(skb, 0, tmp_skb->len, GFP_ATOMIC) < 0) |
58 | goto err; | |
c6c8fea2 SE |
59 | |
60 | /* move free entry to end */ | |
61 | tfp->skb = NULL; | |
62 | tfp->seqno = 0; | |
63 | list_move_tail(&tfp->list, head); | |
64 | ||
65 | memcpy(skb_put(skb, tmp_skb->len), tmp_skb->data, tmp_skb->len); | |
66 | kfree_skb(tmp_skb); | |
67 | ||
68 | memmove(skb->data + uni_diff, skb->data, hdr_len); | |
c67893d1 SE |
69 | packet_pos = skb_pull(skb, uni_diff); |
70 | unicast_packet = (struct batadv_unicast_packet *)packet_pos; | |
acd34afa | 71 | unicast_packet->header.packet_type = BATADV_UNICAST; |
c6c8fea2 SE |
72 | |
73 | return skb; | |
531c9da8 SE |
74 | |
75 | err: | |
76 | /* free buffered skb, skb will be freed later */ | |
77 | kfree_skb(tfp->skb); | |
78 | return NULL; | |
c6c8fea2 SE |
79 | } |
80 | ||
0354440b SE |
81 | static void batadv_frag_create_entry(struct list_head *head, |
82 | struct sk_buff *skb) | |
c6c8fea2 | 83 | { |
56303d34 | 84 | struct batadv_frag_packet_list_entry *tfp; |
96412690 SE |
85 | struct batadv_unicast_frag_packet *up; |
86 | ||
87 | up = (struct batadv_unicast_frag_packet *)skb->data; | |
c6c8fea2 SE |
88 | |
89 | /* free and oldest packets stand at the end */ | |
90 | tfp = list_entry((head)->prev, typeof(*tfp), list); | |
91 | kfree_skb(tfp->skb); | |
92 | ||
93 | tfp->seqno = ntohs(up->seqno); | |
94 | tfp->skb = skb; | |
95 | list_move(&tfp->list, head); | |
96 | return; | |
97 | } | |
98 | ||
0354440b | 99 | static int batadv_frag_create_buffer(struct list_head *head) |
c6c8fea2 SE |
100 | { |
101 | int i; | |
56303d34 | 102 | struct batadv_frag_packet_list_entry *tfp; |
c6c8fea2 | 103 | |
4d5d2db8 | 104 | for (i = 0; i < BATADV_FRAG_BUFFER_SIZE; i++) { |
704509b8 | 105 | tfp = kmalloc(sizeof(*tfp), GFP_ATOMIC); |
c6c8fea2 | 106 | if (!tfp) { |
88ed1e77 | 107 | batadv_frag_list_free(head); |
c6c8fea2 SE |
108 | return -ENOMEM; |
109 | } | |
110 | tfp->skb = NULL; | |
111 | tfp->seqno = 0; | |
112 | INIT_LIST_HEAD(&tfp->list); | |
113 | list_add(&tfp->list, head); | |
114 | } | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
56303d34 | 119 | static struct batadv_frag_packet_list_entry * |
0354440b | 120 | batadv_frag_search_packet(struct list_head *head, |
96412690 | 121 | const struct batadv_unicast_frag_packet *up) |
c6c8fea2 | 122 | { |
56303d34 | 123 | struct batadv_frag_packet_list_entry *tfp; |
96412690 | 124 | struct batadv_unicast_frag_packet *tmp_up = NULL; |
c1d07431 | 125 | bool is_head_tmp, is_head; |
c6c8fea2 SE |
126 | uint16_t search_seqno; |
127 | ||
acd34afa | 128 | if (up->flags & BATADV_UNI_FRAG_HEAD) |
c6c8fea2 SE |
129 | search_seqno = ntohs(up->seqno)+1; |
130 | else | |
131 | search_seqno = ntohs(up->seqno)-1; | |
132 | ||
c1d07431 | 133 | is_head = up->flags & BATADV_UNI_FRAG_HEAD; |
bbb1f90e | 134 | |
c6c8fea2 | 135 | list_for_each_entry(tfp, head, list) { |
c6c8fea2 SE |
136 | if (!tfp->skb) |
137 | continue; | |
138 | ||
139 | if (tfp->seqno == ntohs(up->seqno)) | |
140 | goto mov_tail; | |
141 | ||
96412690 | 142 | tmp_up = (struct batadv_unicast_frag_packet *)tfp->skb->data; |
c6c8fea2 SE |
143 | |
144 | if (tfp->seqno == search_seqno) { | |
c1d07431 | 145 | is_head_tmp = tmp_up->flags & BATADV_UNI_FRAG_HEAD; |
bbb1f90e | 146 | if (is_head_tmp != is_head) |
c6c8fea2 SE |
147 | return tfp; |
148 | else | |
149 | goto mov_tail; | |
150 | } | |
151 | } | |
152 | return NULL; | |
153 | ||
154 | mov_tail: | |
155 | list_move_tail(&tfp->list, head); | |
156 | return NULL; | |
157 | } | |
158 | ||
88ed1e77 | 159 | void batadv_frag_list_free(struct list_head *head) |
c6c8fea2 | 160 | { |
56303d34 | 161 | struct batadv_frag_packet_list_entry *pf, *tmp_pf; |
c6c8fea2 SE |
162 | |
163 | if (!list_empty(head)) { | |
c6c8fea2 SE |
164 | list_for_each_entry_safe(pf, tmp_pf, head, list) { |
165 | kfree_skb(pf->skb); | |
166 | list_del(&pf->list); | |
167 | kfree(pf); | |
168 | } | |
169 | } | |
170 | return; | |
171 | } | |
172 | ||
173 | /* frag_reassemble_skb(): | |
174 | * returns NET_RX_DROP if the operation failed - skb is left intact | |
175 | * returns NET_RX_SUCCESS if the fragment was buffered (skb_new will be NULL) | |
176 | * or the skb could be reassembled (skb_new will point to the new packet and | |
177 | * skb was freed) | |
178 | */ | |
56303d34 SE |
179 | int batadv_frag_reassemble_skb(struct sk_buff *skb, |
180 | struct batadv_priv *bat_priv, | |
88ed1e77 | 181 | struct sk_buff **new_skb) |
c6c8fea2 | 182 | { |
56303d34 SE |
183 | struct batadv_orig_node *orig_node; |
184 | struct batadv_frag_packet_list_entry *tmp_frag_entry; | |
c6c8fea2 | 185 | int ret = NET_RX_DROP; |
96412690 | 186 | struct batadv_unicast_frag_packet *unicast_packet; |
c6c8fea2 | 187 | |
96412690 | 188 | unicast_packet = (struct batadv_unicast_frag_packet *)skb->data; |
c6c8fea2 | 189 | *new_skb = NULL; |
c6c8fea2 | 190 | |
da641193 | 191 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->orig); |
7aadf889 | 192 | if (!orig_node) |
c6c8fea2 | 193 | goto out; |
c6c8fea2 SE |
194 | |
195 | orig_node->last_frag_packet = jiffies; | |
196 | ||
197 | if (list_empty(&orig_node->frag_list) && | |
0354440b | 198 | batadv_frag_create_buffer(&orig_node->frag_list)) { |
c6c8fea2 SE |
199 | pr_debug("couldn't create frag buffer\n"); |
200 | goto out; | |
201 | } | |
202 | ||
0354440b SE |
203 | tmp_frag_entry = batadv_frag_search_packet(&orig_node->frag_list, |
204 | unicast_packet); | |
c6c8fea2 SE |
205 | |
206 | if (!tmp_frag_entry) { | |
0354440b | 207 | batadv_frag_create_entry(&orig_node->frag_list, skb); |
c6c8fea2 SE |
208 | ret = NET_RX_SUCCESS; |
209 | goto out; | |
210 | } | |
211 | ||
0354440b SE |
212 | *new_skb = batadv_frag_merge_packet(&orig_node->frag_list, |
213 | tmp_frag_entry, skb); | |
c6c8fea2 SE |
214 | /* if not, merge failed */ |
215 | if (*new_skb) | |
216 | ret = NET_RX_SUCCESS; | |
c6c8fea2 | 217 | |
7aadf889 ML |
218 | out: |
219 | if (orig_node) | |
7d211efc | 220 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
221 | return ret; |
222 | } | |
223 | ||
56303d34 SE |
224 | int batadv_frag_send_skb(struct sk_buff *skb, struct batadv_priv *bat_priv, |
225 | struct batadv_hard_iface *hard_iface, | |
226 | const uint8_t dstaddr[]) | |
c6c8fea2 | 227 | { |
96412690 | 228 | struct batadv_unicast_packet tmp_uc, *unicast_packet; |
56303d34 | 229 | struct batadv_hard_iface *primary_if; |
c6c8fea2 | 230 | struct sk_buff *frag_skb; |
96412690 | 231 | struct batadv_unicast_frag_packet *frag1, *frag2; |
704509b8 SE |
232 | int uc_hdr_len = sizeof(*unicast_packet); |
233 | int ucf_hdr_len = sizeof(*frag1); | |
5c77d8bb | 234 | int data_len = skb->len - uc_hdr_len; |
32ae9b22 | 235 | int large_tail = 0, ret = NET_RX_DROP; |
c2f7f0e7 | 236 | uint16_t seqno; |
c6c8fea2 | 237 | |
e5d89254 | 238 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 239 | if (!primary_if) |
c6c8fea2 SE |
240 | goto dropped; |
241 | ||
ed7809d9 JJ |
242 | frag_skb = dev_alloc_skb(data_len - (data_len / 2) + ucf_hdr_len); |
243 | if (!frag_skb) | |
244 | goto dropped; | |
5c77d8bb | 245 | skb_reserve(frag_skb, ucf_hdr_len); |
c6c8fea2 | 246 | |
96412690 | 247 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 | 248 | memcpy(&tmp_uc, unicast_packet, uc_hdr_len); |
5c77d8bb | 249 | skb_split(skb, frag_skb, data_len / 2 + uc_hdr_len); |
c6c8fea2 | 250 | |
04b482a2 SE |
251 | if (batadv_skb_head_push(skb, ucf_hdr_len - uc_hdr_len) < 0 || |
252 | batadv_skb_head_push(frag_skb, ucf_hdr_len) < 0) | |
c6c8fea2 SE |
253 | goto drop_frag; |
254 | ||
96412690 SE |
255 | frag1 = (struct batadv_unicast_frag_packet *)skb->data; |
256 | frag2 = (struct batadv_unicast_frag_packet *)frag_skb->data; | |
c6c8fea2 | 257 | |
704509b8 | 258 | memcpy(frag1, &tmp_uc, sizeof(tmp_uc)); |
c6c8fea2 | 259 | |
76543d14 | 260 | frag1->header.ttl--; |
7e071c79 | 261 | frag1->header.version = BATADV_COMPAT_VERSION; |
acd34afa | 262 | frag1->header.packet_type = BATADV_UNICAST_FRAG; |
c6c8fea2 | 263 | |
32ae9b22 | 264 | memcpy(frag1->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
704509b8 | 265 | memcpy(frag2, frag1, sizeof(*frag2)); |
c6c8fea2 | 266 | |
ae361ce1 | 267 | if (data_len & 1) |
acd34afa | 268 | large_tail = BATADV_UNI_FRAG_LARGETAIL; |
ae361ce1 | 269 | |
acd34afa | 270 | frag1->flags = BATADV_UNI_FRAG_HEAD | large_tail; |
ae361ce1 | 271 | frag2->flags = large_tail; |
c6c8fea2 | 272 | |
e6c10f43 | 273 | seqno = atomic_add_return(2, &hard_iface->frag_seqno); |
c2f7f0e7 SE |
274 | frag1->seqno = htons(seqno - 1); |
275 | frag2->seqno = htons(seqno); | |
c6c8fea2 | 276 | |
9455e34c SE |
277 | batadv_send_skb_packet(skb, hard_iface, dstaddr); |
278 | batadv_send_skb_packet(frag_skb, hard_iface, dstaddr); | |
32ae9b22 ML |
279 | ret = NET_RX_SUCCESS; |
280 | goto out; | |
c6c8fea2 SE |
281 | |
282 | drop_frag: | |
283 | kfree_skb(frag_skb); | |
284 | dropped: | |
285 | kfree_skb(skb); | |
32ae9b22 ML |
286 | out: |
287 | if (primary_if) | |
e5d89254 | 288 | batadv_hardif_free_ref(primary_if); |
32ae9b22 | 289 | return ret; |
c6c8fea2 SE |
290 | } |
291 | ||
7cdcf6dd AQ |
292 | /** |
293 | * batadv_unicast_push_and_fill_skb - extends the buffer and initializes the | |
294 | * common fields for unicast packets | |
295 | * @skb: packet | |
296 | * @hdr_size: amount of bytes to push at the beginning of the skb | |
297 | * @orig_node: the destination node | |
298 | * | |
299 | * Returns false if the buffer extension was not possible or true otherwise | |
300 | */ | |
301 | static bool batadv_unicast_push_and_fill_skb(struct sk_buff *skb, int hdr_size, | |
302 | struct batadv_orig_node *orig_node) | |
303 | { | |
304 | struct batadv_unicast_packet *unicast_packet; | |
305 | uint8_t ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
306 | ||
307 | if (batadv_skb_head_push(skb, hdr_size) < 0) | |
308 | return false; | |
309 | ||
310 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
311 | unicast_packet->header.version = BATADV_COMPAT_VERSION; | |
312 | /* batman packet type: unicast */ | |
313 | unicast_packet->header.packet_type = BATADV_UNICAST; | |
314 | /* set unicast ttl */ | |
315 | unicast_packet->header.ttl = BATADV_TTL; | |
316 | /* copy the destination for faster routing */ | |
317 | memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN); | |
318 | /* set the destination tt version number */ | |
319 | unicast_packet->ttvn = ttvn; | |
320 | ||
321 | return true; | |
322 | } | |
323 | ||
324 | /** | |
325 | * batadv_unicast_prepare_skb - encapsulate an skb with a unicast header | |
326 | * @skb: the skb containing the payload to encapsulate | |
327 | * @orig_node: the destination node | |
328 | * | |
9d2c9488 LL |
329 | * Returns false if the payload could not be encapsulated or true otherwise. |
330 | * | |
331 | * This call might reallocate skb data. | |
7cdcf6dd AQ |
332 | */ |
333 | static bool batadv_unicast_prepare_skb(struct sk_buff *skb, | |
334 | struct batadv_orig_node *orig_node) | |
335 | { | |
336 | size_t uni_size = sizeof(struct batadv_unicast_packet); | |
337 | return batadv_unicast_push_and_fill_skb(skb, uni_size, orig_node); | |
338 | } | |
339 | ||
340 | /** | |
341 | * batadv_unicast_4addr_prepare_skb - encapsulate an skb with a unicast4addr | |
342 | * header | |
343 | * @bat_priv: the bat priv with all the soft interface information | |
344 | * @skb: the skb containing the payload to encapsulate | |
345 | * @orig_node: the destination node | |
346 | * @packet_subtype: the batman 4addr packet subtype to use | |
347 | * | |
9d2c9488 LL |
348 | * Returns false if the payload could not be encapsulated or true otherwise. |
349 | * | |
350 | * This call might reallocate skb data. | |
7cdcf6dd | 351 | */ |
785ea114 AQ |
352 | bool batadv_unicast_4addr_prepare_skb(struct batadv_priv *bat_priv, |
353 | struct sk_buff *skb, | |
354 | struct batadv_orig_node *orig, | |
355 | int packet_subtype) | |
7cdcf6dd AQ |
356 | { |
357 | struct batadv_hard_iface *primary_if; | |
358 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; | |
359 | bool ret = false; | |
360 | ||
361 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
362 | if (!primary_if) | |
363 | goto out; | |
364 | ||
365 | /* pull the header space and fill the unicast_packet substructure. | |
366 | * We can do that because the first member of the unicast_4addr_packet | |
367 | * is of type struct unicast_packet | |
368 | */ | |
369 | if (!batadv_unicast_push_and_fill_skb(skb, | |
370 | sizeof(*unicast_4addr_packet), | |
371 | orig)) | |
372 | goto out; | |
373 | ||
374 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; | |
375 | unicast_4addr_packet->u.header.packet_type = BATADV_UNICAST_4ADDR; | |
376 | memcpy(unicast_4addr_packet->src, primary_if->net_dev->dev_addr, | |
377 | ETH_ALEN); | |
378 | unicast_4addr_packet->subtype = packet_subtype; | |
379 | unicast_4addr_packet->reserved = 0; | |
380 | ||
381 | ret = true; | |
382 | out: | |
383 | if (primary_if) | |
384 | batadv_hardif_free_ref(primary_if); | |
385 | return ret; | |
386 | } | |
387 | ||
388 | /** | |
389 | * batadv_unicast_generic_send_skb - send an skb as unicast | |
390 | * @bat_priv: the bat priv with all the soft interface information | |
391 | * @skb: payload to send | |
392 | * @packet_type: the batman unicast packet type to use | |
393 | * @packet_subtype: the batman packet subtype. It is ignored if packet_type is | |
394 | * not BATADV_UNICAT_4ADDR | |
395 | * | |
396 | * Returns 1 in case of error or 0 otherwise | |
397 | */ | |
398 | int batadv_unicast_generic_send_skb(struct batadv_priv *bat_priv, | |
399 | struct sk_buff *skb, int packet_type, | |
400 | int packet_subtype) | |
c6c8fea2 SE |
401 | { |
402 | struct ethhdr *ethhdr = (struct ethhdr *)skb->data; | |
96412690 | 403 | struct batadv_unicast_packet *unicast_packet; |
56303d34 SE |
404 | struct batadv_orig_node *orig_node; |
405 | struct batadv_neigh_node *neigh_node; | |
c6c8fea2 | 406 | int data_len = skb->len; |
bb351ba0 | 407 | int ret = NET_RX_DROP; |
9d2c9488 | 408 | unsigned int dev_mtu, header_len; |
c6c8fea2 SE |
409 | |
410 | /* get routing information */ | |
43c70ad5 | 411 | if (is_multicast_ether_addr(ethhdr->h_dest)) { |
7cf06bc6 | 412 | orig_node = batadv_gw_get_selected_orig(bat_priv); |
43c70ad5 | 413 | if (orig_node) |
44524fcd ML |
414 | goto find_router; |
415 | } | |
c6c8fea2 | 416 | |
3d393e47 | 417 | /* check for tt host - increases orig_node refcount. |
9cfc7bd6 SE |
418 | * returns NULL in case of AP isolation |
419 | */ | |
08c36d3e SE |
420 | orig_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
421 | ethhdr->h_dest); | |
56303d34 | 422 | |
44524fcd | 423 | find_router: |
9cfc7bd6 | 424 | /* find_router(): |
d0072609 ML |
425 | * - if orig_node is NULL it returns NULL |
426 | * - increases neigh_nodes refcount if found. | |
427 | */ | |
30d3c511 | 428 | neigh_node = batadv_find_router(bat_priv, orig_node, NULL); |
56303d34 | 429 | |
44524fcd | 430 | if (!neigh_node) |
d0072609 | 431 | goto out; |
c6c8fea2 | 432 | |
7cdcf6dd AQ |
433 | switch (packet_type) { |
434 | case BATADV_UNICAST: | |
50fa3b31 LL |
435 | if (!batadv_unicast_prepare_skb(skb, orig_node)) |
436 | goto out; | |
437 | ||
9d2c9488 | 438 | header_len = sizeof(struct batadv_unicast_packet); |
7cdcf6dd AQ |
439 | break; |
440 | case BATADV_UNICAST_4ADDR: | |
50fa3b31 LL |
441 | if (!batadv_unicast_4addr_prepare_skb(bat_priv, skb, orig_node, |
442 | packet_subtype)) | |
443 | goto out; | |
444 | ||
9d2c9488 | 445 | header_len = sizeof(struct batadv_unicast_4addr_packet); |
7cdcf6dd AQ |
446 | break; |
447 | default: | |
448 | /* this function supports UNICAST and UNICAST_4ADDR only. It | |
449 | * should never be invoked with any other packet type | |
450 | */ | |
d0072609 | 451 | goto out; |
7cdcf6dd | 452 | } |
c6c8fea2 | 453 | |
9d2c9488 | 454 | ethhdr = (struct ethhdr *)(skb->data + header_len); |
96412690 | 455 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 | 456 | |
3275e7cc AQ |
457 | /* inform the destination node that we are still missing a correct route |
458 | * for this client. The destination will receive this packet and will | |
459 | * try to reroute it because the ttvn contained in the header is less | |
460 | * than the current one | |
461 | */ | |
08c36d3e | 462 | if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest)) |
3275e7cc AQ |
463 | unicast_packet->ttvn = unicast_packet->ttvn - 1; |
464 | ||
0aca2369 | 465 | dev_mtu = neigh_node->if_incoming->net_dev->mtu; |
7cdcf6dd AQ |
466 | /* fragmentation mechanism only works for UNICAST (now) */ |
467 | if (packet_type == BATADV_UNICAST && | |
468 | atomic_read(&bat_priv->fragmentation) && | |
0aca2369 | 469 | data_len + sizeof(*unicast_packet) > dev_mtu) { |
c6c8fea2 | 470 | /* send frag skb decreases ttl */ |
76543d14 | 471 | unicast_packet->header.ttl++; |
88ed1e77 SE |
472 | ret = batadv_frag_send_skb(skb, bat_priv, |
473 | neigh_node->if_incoming, | |
474 | neigh_node->addr); | |
44524fcd | 475 | goto out; |
c6c8fea2 | 476 | } |
c6c8fea2 | 477 | |
e91ecfc6 | 478 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) |
bb351ba0 | 479 | ret = 0; |
c6c8fea2 | 480 | |
44524fcd ML |
481 | out: |
482 | if (neigh_node) | |
7d211efc | 483 | batadv_neigh_node_free_ref(neigh_node); |
44524fcd | 484 | if (orig_node) |
7d211efc | 485 | batadv_orig_node_free_ref(orig_node); |
bb351ba0 | 486 | if (ret == NET_RX_DROP) |
44524fcd ML |
487 | kfree_skb(skb); |
488 | return ret; | |
c6c8fea2 | 489 | } |