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9cfc7bd6 | 1 | /* Copyright (C) 2010-2012 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; | |
c6c8fea2 | 42 | |
96412690 | 43 | up = (struct batadv_unicast_frag_packet *)skb->data; |
c6c8fea2 | 44 | /* set skb to the first part and tmp_skb to the second part */ |
acd34afa | 45 | if (up->flags & BATADV_UNI_FRAG_HEAD) { |
c6c8fea2 SE |
46 | tmp_skb = tfp->skb; |
47 | } else { | |
48 | tmp_skb = skb; | |
49 | skb = tfp->skb; | |
50 | } | |
51 | ||
531c9da8 SE |
52 | if (skb_linearize(skb) < 0 || skb_linearize(tmp_skb) < 0) |
53 | goto err; | |
54 | ||
704509b8 | 55 | skb_pull(tmp_skb, sizeof(*up)); |
531c9da8 SE |
56 | if (pskb_expand_head(skb, 0, tmp_skb->len, GFP_ATOMIC) < 0) |
57 | goto err; | |
c6c8fea2 SE |
58 | |
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); | |
96412690 SE |
68 | unicast_packet = (struct batadv_unicast_packet *)skb_pull(skb, |
69 | uni_diff); | |
acd34afa | 70 | unicast_packet->header.packet_type = BATADV_UNICAST; |
c6c8fea2 SE |
71 | |
72 | return skb; | |
531c9da8 SE |
73 | |
74 | err: | |
75 | /* free buffered skb, skb will be freed later */ | |
76 | kfree_skb(tfp->skb); | |
77 | return NULL; | |
c6c8fea2 SE |
78 | } |
79 | ||
0354440b SE |
80 | static void batadv_frag_create_entry(struct list_head *head, |
81 | struct sk_buff *skb) | |
c6c8fea2 | 82 | { |
56303d34 | 83 | struct batadv_frag_packet_list_entry *tfp; |
96412690 SE |
84 | struct batadv_unicast_frag_packet *up; |
85 | ||
86 | up = (struct batadv_unicast_frag_packet *)skb->data; | |
c6c8fea2 SE |
87 | |
88 | /* free and oldest packets stand at the end */ | |
89 | tfp = list_entry((head)->prev, typeof(*tfp), list); | |
90 | kfree_skb(tfp->skb); | |
91 | ||
92 | tfp->seqno = ntohs(up->seqno); | |
93 | tfp->skb = skb; | |
94 | list_move(&tfp->list, head); | |
95 | return; | |
96 | } | |
97 | ||
0354440b | 98 | static int batadv_frag_create_buffer(struct list_head *head) |
c6c8fea2 SE |
99 | { |
100 | int i; | |
56303d34 | 101 | struct batadv_frag_packet_list_entry *tfp; |
c6c8fea2 | 102 | |
4d5d2db8 | 103 | for (i = 0; i < BATADV_FRAG_BUFFER_SIZE; i++) { |
704509b8 | 104 | tfp = kmalloc(sizeof(*tfp), GFP_ATOMIC); |
c6c8fea2 | 105 | if (!tfp) { |
88ed1e77 | 106 | batadv_frag_list_free(head); |
c6c8fea2 SE |
107 | return -ENOMEM; |
108 | } | |
109 | tfp->skb = NULL; | |
110 | tfp->seqno = 0; | |
111 | INIT_LIST_HEAD(&tfp->list); | |
112 | list_add(&tfp->list, head); | |
113 | } | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
56303d34 | 118 | static struct batadv_frag_packet_list_entry * |
0354440b | 119 | batadv_frag_search_packet(struct list_head *head, |
96412690 | 120 | const struct batadv_unicast_frag_packet *up) |
c6c8fea2 | 121 | { |
56303d34 | 122 | struct batadv_frag_packet_list_entry *tfp; |
96412690 | 123 | struct batadv_unicast_frag_packet *tmp_up = NULL; |
bbb1f90e | 124 | int is_head_tmp, is_head; |
c6c8fea2 SE |
125 | uint16_t search_seqno; |
126 | ||
acd34afa | 127 | if (up->flags & BATADV_UNI_FRAG_HEAD) |
c6c8fea2 SE |
128 | search_seqno = ntohs(up->seqno)+1; |
129 | else | |
130 | search_seqno = ntohs(up->seqno)-1; | |
131 | ||
bbb1f90e SE |
132 | is_head = !!(up->flags & BATADV_UNI_FRAG_HEAD); |
133 | ||
c6c8fea2 SE |
134 | list_for_each_entry(tfp, head, list) { |
135 | ||
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) { | |
bbb1f90e SE |
145 | is_head_tmp = !!(tmp_up->flags & BATADV_UNI_FRAG_HEAD); |
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)) { | |
164 | ||
165 | list_for_each_entry_safe(pf, tmp_pf, head, list) { | |
166 | kfree_skb(pf->skb); | |
167 | list_del(&pf->list); | |
168 | kfree(pf); | |
169 | } | |
170 | } | |
171 | return; | |
172 | } | |
173 | ||
174 | /* frag_reassemble_skb(): | |
175 | * returns NET_RX_DROP if the operation failed - skb is left intact | |
176 | * returns NET_RX_SUCCESS if the fragment was buffered (skb_new will be NULL) | |
177 | * or the skb could be reassembled (skb_new will point to the new packet and | |
178 | * skb was freed) | |
179 | */ | |
56303d34 SE |
180 | int batadv_frag_reassemble_skb(struct sk_buff *skb, |
181 | struct batadv_priv *bat_priv, | |
88ed1e77 | 182 | struct sk_buff **new_skb) |
c6c8fea2 | 183 | { |
56303d34 SE |
184 | struct batadv_orig_node *orig_node; |
185 | struct batadv_frag_packet_list_entry *tmp_frag_entry; | |
c6c8fea2 | 186 | int ret = NET_RX_DROP; |
96412690 | 187 | struct batadv_unicast_frag_packet *unicast_packet; |
c6c8fea2 | 188 | |
96412690 | 189 | unicast_packet = (struct batadv_unicast_frag_packet *)skb->data; |
c6c8fea2 | 190 | *new_skb = NULL; |
c6c8fea2 | 191 | |
da641193 | 192 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->orig); |
7aadf889 | 193 | if (!orig_node) |
c6c8fea2 | 194 | goto out; |
c6c8fea2 SE |
195 | |
196 | orig_node->last_frag_packet = jiffies; | |
197 | ||
198 | if (list_empty(&orig_node->frag_list) && | |
0354440b | 199 | batadv_frag_create_buffer(&orig_node->frag_list)) { |
c6c8fea2 SE |
200 | pr_debug("couldn't create frag buffer\n"); |
201 | goto out; | |
202 | } | |
203 | ||
0354440b SE |
204 | tmp_frag_entry = batadv_frag_search_packet(&orig_node->frag_list, |
205 | unicast_packet); | |
c6c8fea2 SE |
206 | |
207 | if (!tmp_frag_entry) { | |
0354440b | 208 | batadv_frag_create_entry(&orig_node->frag_list, skb); |
c6c8fea2 SE |
209 | ret = NET_RX_SUCCESS; |
210 | goto out; | |
211 | } | |
212 | ||
0354440b SE |
213 | *new_skb = batadv_frag_merge_packet(&orig_node->frag_list, |
214 | tmp_frag_entry, skb); | |
c6c8fea2 SE |
215 | /* if not, merge failed */ |
216 | if (*new_skb) | |
217 | ret = NET_RX_SUCCESS; | |
c6c8fea2 | 218 | |
7aadf889 ML |
219 | out: |
220 | if (orig_node) | |
7d211efc | 221 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
222 | return ret; |
223 | } | |
224 | ||
56303d34 SE |
225 | int batadv_frag_send_skb(struct sk_buff *skb, struct batadv_priv *bat_priv, |
226 | struct batadv_hard_iface *hard_iface, | |
227 | const uint8_t dstaddr[]) | |
c6c8fea2 | 228 | { |
96412690 | 229 | struct batadv_unicast_packet tmp_uc, *unicast_packet; |
56303d34 | 230 | struct batadv_hard_iface *primary_if; |
c6c8fea2 | 231 | struct sk_buff *frag_skb; |
96412690 | 232 | struct batadv_unicast_frag_packet *frag1, *frag2; |
704509b8 SE |
233 | int uc_hdr_len = sizeof(*unicast_packet); |
234 | int ucf_hdr_len = sizeof(*frag1); | |
5c77d8bb | 235 | int data_len = skb->len - uc_hdr_len; |
32ae9b22 | 236 | int large_tail = 0, ret = NET_RX_DROP; |
c2f7f0e7 | 237 | uint16_t seqno; |
c6c8fea2 | 238 | |
e5d89254 | 239 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 240 | if (!primary_if) |
c6c8fea2 SE |
241 | goto dropped; |
242 | ||
ed7809d9 JJ |
243 | frag_skb = dev_alloc_skb(data_len - (data_len / 2) + ucf_hdr_len); |
244 | if (!frag_skb) | |
245 | goto dropped; | |
5c77d8bb | 246 | skb_reserve(frag_skb, ucf_hdr_len); |
c6c8fea2 | 247 | |
96412690 | 248 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 | 249 | memcpy(&tmp_uc, unicast_packet, uc_hdr_len); |
5c77d8bb | 250 | skb_split(skb, frag_skb, data_len / 2 + uc_hdr_len); |
c6c8fea2 | 251 | |
04b482a2 SE |
252 | if (batadv_skb_head_push(skb, ucf_hdr_len - uc_hdr_len) < 0 || |
253 | batadv_skb_head_push(frag_skb, ucf_hdr_len) < 0) | |
c6c8fea2 SE |
254 | goto drop_frag; |
255 | ||
96412690 SE |
256 | frag1 = (struct batadv_unicast_frag_packet *)skb->data; |
257 | frag2 = (struct batadv_unicast_frag_packet *)frag_skb->data; | |
c6c8fea2 | 258 | |
704509b8 | 259 | memcpy(frag1, &tmp_uc, sizeof(tmp_uc)); |
c6c8fea2 | 260 | |
76543d14 | 261 | frag1->header.ttl--; |
7e071c79 | 262 | frag1->header.version = BATADV_COMPAT_VERSION; |
acd34afa | 263 | frag1->header.packet_type = BATADV_UNICAST_FRAG; |
c6c8fea2 | 264 | |
32ae9b22 | 265 | memcpy(frag1->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
704509b8 | 266 | memcpy(frag2, frag1, sizeof(*frag2)); |
c6c8fea2 | 267 | |
ae361ce1 | 268 | if (data_len & 1) |
acd34afa | 269 | large_tail = BATADV_UNI_FRAG_LARGETAIL; |
ae361ce1 | 270 | |
acd34afa | 271 | frag1->flags = BATADV_UNI_FRAG_HEAD | large_tail; |
ae361ce1 | 272 | frag2->flags = large_tail; |
c6c8fea2 | 273 | |
e6c10f43 | 274 | seqno = atomic_add_return(2, &hard_iface->frag_seqno); |
c2f7f0e7 SE |
275 | frag1->seqno = htons(seqno - 1); |
276 | frag2->seqno = htons(seqno); | |
c6c8fea2 | 277 | |
9455e34c SE |
278 | batadv_send_skb_packet(skb, hard_iface, dstaddr); |
279 | batadv_send_skb_packet(frag_skb, hard_iface, dstaddr); | |
32ae9b22 ML |
280 | ret = NET_RX_SUCCESS; |
281 | goto out; | |
c6c8fea2 SE |
282 | |
283 | drop_frag: | |
284 | kfree_skb(frag_skb); | |
285 | dropped: | |
286 | kfree_skb(skb); | |
32ae9b22 ML |
287 | out: |
288 | if (primary_if) | |
e5d89254 | 289 | batadv_hardif_free_ref(primary_if); |
32ae9b22 | 290 | return ret; |
c6c8fea2 SE |
291 | } |
292 | ||
56303d34 | 293 | int batadv_unicast_send_skb(struct sk_buff *skb, struct batadv_priv *bat_priv) |
c6c8fea2 SE |
294 | { |
295 | struct ethhdr *ethhdr = (struct ethhdr *)skb->data; | |
96412690 | 296 | struct batadv_unicast_packet *unicast_packet; |
56303d34 SE |
297 | struct batadv_orig_node *orig_node; |
298 | struct batadv_neigh_node *neigh_node; | |
c6c8fea2 | 299 | int data_len = skb->len; |
44524fcd | 300 | int ret = 1; |
0aca2369 | 301 | unsigned int dev_mtu; |
c6c8fea2 SE |
302 | |
303 | /* get routing information */ | |
43c70ad5 | 304 | if (is_multicast_ether_addr(ethhdr->h_dest)) { |
7cf06bc6 | 305 | orig_node = batadv_gw_get_selected_orig(bat_priv); |
43c70ad5 | 306 | if (orig_node) |
44524fcd ML |
307 | goto find_router; |
308 | } | |
c6c8fea2 | 309 | |
3d393e47 | 310 | /* check for tt host - increases orig_node refcount. |
9cfc7bd6 SE |
311 | * returns NULL in case of AP isolation |
312 | */ | |
08c36d3e SE |
313 | orig_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
314 | ethhdr->h_dest); | |
56303d34 | 315 | |
44524fcd | 316 | find_router: |
9cfc7bd6 | 317 | /* find_router(): |
d0072609 ML |
318 | * - if orig_node is NULL it returns NULL |
319 | * - increases neigh_nodes refcount if found. | |
320 | */ | |
30d3c511 | 321 | neigh_node = batadv_find_router(bat_priv, orig_node, NULL); |
56303d34 | 322 | |
44524fcd | 323 | if (!neigh_node) |
d0072609 | 324 | goto out; |
c6c8fea2 | 325 | |
04b482a2 | 326 | if (batadv_skb_head_push(skb, sizeof(*unicast_packet)) < 0) |
d0072609 | 327 | goto out; |
c6c8fea2 | 328 | |
96412690 | 329 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 | 330 | |
7e071c79 | 331 | unicast_packet->header.version = BATADV_COMPAT_VERSION; |
c6c8fea2 | 332 | /* batman packet type: unicast */ |
acd34afa | 333 | unicast_packet->header.packet_type = BATADV_UNICAST; |
c6c8fea2 | 334 | /* set unicast ttl */ |
42d0b044 | 335 | unicast_packet->header.ttl = BATADV_TTL; |
c6c8fea2 SE |
336 | /* copy the destination for faster routing */ |
337 | memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN); | |
a73105b8 | 338 | /* set the destination tt version number */ |
bbb1f90e | 339 | unicast_packet->ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); |
c6c8fea2 | 340 | |
3275e7cc AQ |
341 | /* inform the destination node that we are still missing a correct route |
342 | * for this client. The destination will receive this packet and will | |
343 | * try to reroute it because the ttvn contained in the header is less | |
344 | * than the current one | |
345 | */ | |
08c36d3e | 346 | if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest)) |
3275e7cc AQ |
347 | unicast_packet->ttvn = unicast_packet->ttvn - 1; |
348 | ||
0aca2369 | 349 | dev_mtu = neigh_node->if_incoming->net_dev->mtu; |
c6c8fea2 | 350 | if (atomic_read(&bat_priv->fragmentation) && |
0aca2369 | 351 | data_len + sizeof(*unicast_packet) > dev_mtu) { |
c6c8fea2 | 352 | /* send frag skb decreases ttl */ |
76543d14 | 353 | unicast_packet->header.ttl++; |
88ed1e77 SE |
354 | ret = batadv_frag_send_skb(skb, bat_priv, |
355 | neigh_node->if_incoming, | |
356 | neigh_node->addr); | |
44524fcd | 357 | goto out; |
c6c8fea2 | 358 | } |
c6c8fea2 | 359 | |
9455e34c | 360 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
44524fcd ML |
361 | ret = 0; |
362 | goto out; | |
c6c8fea2 | 363 | |
44524fcd ML |
364 | out: |
365 | if (neigh_node) | |
7d211efc | 366 | batadv_neigh_node_free_ref(neigh_node); |
44524fcd | 367 | if (orig_node) |
7d211efc | 368 | batadv_orig_node_free_ref(orig_node); |
44524fcd ML |
369 | if (ret == 1) |
370 | kfree_skb(skb); | |
371 | return ret; | |
c6c8fea2 | 372 | } |