Antonio Quartulli | 0b87393 | 2013-01-04 03:05:31 +0100 | [diff] [blame] | 1 | /* Copyright (C) 2010-2013 B.A.T.M.A.N. contributors: |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 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 |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 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 | |
Sven Eckelmann | 0354440 | 2012-05-16 20:23:17 +0200 | [diff] [blame] | 32 | static struct sk_buff * |
| 33 | batadv_frag_merge_packet(struct list_head *head, |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 34 | struct batadv_frag_packet_list_entry *tfp, |
Sven Eckelmann | 0354440 | 2012-05-16 20:23:17 +0200 | [diff] [blame] | 35 | struct sk_buff *skb) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 36 | { |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 37 | struct batadv_unicast_frag_packet *up; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 38 | struct sk_buff *tmp_skb; |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 39 | struct batadv_unicast_packet *unicast_packet; |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 40 | int hdr_len = sizeof(*unicast_packet); |
| 41 | int uni_diff = sizeof(*up) - hdr_len; |
Sven Eckelmann | c67893d | 2012-07-08 18:33:51 +0200 | [diff] [blame] | 42 | uint8_t *packet_pos; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 43 | |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 44 | up = (struct batadv_unicast_frag_packet *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 45 | /* set skb to the first part and tmp_skb to the second part */ |
Sven Eckelmann | acd34af | 2012-06-03 22:19:21 +0200 | [diff] [blame] | 46 | if (up->flags & BATADV_UNI_FRAG_HEAD) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 47 | tmp_skb = tfp->skb; |
| 48 | } else { |
| 49 | tmp_skb = skb; |
| 50 | skb = tfp->skb; |
| 51 | } |
| 52 | |
Sven Eckelmann | 531c9da | 2011-02-06 23:26:43 +0000 | [diff] [blame] | 53 | if (skb_linearize(skb) < 0 || skb_linearize(tmp_skb) < 0) |
| 54 | goto err; |
| 55 | |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 56 | skb_pull(tmp_skb, sizeof(*up)); |
Sven Eckelmann | 531c9da | 2011-02-06 23:26:43 +0000 | [diff] [blame] | 57 | if (pskb_expand_head(skb, 0, tmp_skb->len, GFP_ATOMIC) < 0) |
| 58 | goto err; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 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); |
Sven Eckelmann | c67893d | 2012-07-08 18:33:51 +0200 | [diff] [blame] | 69 | packet_pos = skb_pull(skb, uni_diff); |
| 70 | unicast_packet = (struct batadv_unicast_packet *)packet_pos; |
Sven Eckelmann | acd34af | 2012-06-03 22:19:21 +0200 | [diff] [blame] | 71 | unicast_packet->header.packet_type = BATADV_UNICAST; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 72 | |
| 73 | return skb; |
Sven Eckelmann | 531c9da | 2011-02-06 23:26:43 +0000 | [diff] [blame] | 74 | |
| 75 | err: |
| 76 | /* free buffered skb, skb will be freed later */ |
| 77 | kfree_skb(tfp->skb); |
| 78 | return NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 79 | } |
| 80 | |
Sven Eckelmann | 0354440 | 2012-05-16 20:23:17 +0200 | [diff] [blame] | 81 | static void batadv_frag_create_entry(struct list_head *head, |
| 82 | struct sk_buff *skb) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 83 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 84 | struct batadv_frag_packet_list_entry *tfp; |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 85 | struct batadv_unicast_frag_packet *up; |
| 86 | |
| 87 | up = (struct batadv_unicast_frag_packet *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 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 | |
Sven Eckelmann | 0354440 | 2012-05-16 20:23:17 +0200 | [diff] [blame] | 99 | static int batadv_frag_create_buffer(struct list_head *head) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 100 | { |
| 101 | int i; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 102 | struct batadv_frag_packet_list_entry *tfp; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 103 | |
Sven Eckelmann | 4d5d2db8 | 2012-06-03 22:19:15 +0200 | [diff] [blame] | 104 | for (i = 0; i < BATADV_FRAG_BUFFER_SIZE; i++) { |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 105 | tfp = kmalloc(sizeof(*tfp), GFP_ATOMIC); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 106 | if (!tfp) { |
Sven Eckelmann | 88ed1e77 | 2012-05-12 02:09:40 +0200 | [diff] [blame] | 107 | batadv_frag_list_free(head); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 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 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 119 | static struct batadv_frag_packet_list_entry * |
Sven Eckelmann | 0354440 | 2012-05-16 20:23:17 +0200 | [diff] [blame] | 120 | batadv_frag_search_packet(struct list_head *head, |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 121 | const struct batadv_unicast_frag_packet *up) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 122 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 123 | struct batadv_frag_packet_list_entry *tfp; |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 124 | struct batadv_unicast_frag_packet *tmp_up = NULL; |
Antonio Quartulli | c1d0743 | 2013-01-15 22:17:19 +1000 | [diff] [blame^] | 125 | bool is_head_tmp, is_head; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 126 | uint16_t search_seqno; |
| 127 | |
Sven Eckelmann | acd34af | 2012-06-03 22:19:21 +0200 | [diff] [blame] | 128 | if (up->flags & BATADV_UNI_FRAG_HEAD) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 129 | search_seqno = ntohs(up->seqno)+1; |
| 130 | else |
| 131 | search_seqno = ntohs(up->seqno)-1; |
| 132 | |
Antonio Quartulli | c1d0743 | 2013-01-15 22:17:19 +1000 | [diff] [blame^] | 133 | is_head = up->flags & BATADV_UNI_FRAG_HEAD; |
Sven Eckelmann | bbb1f90 | 2012-07-08 17:13:15 +0200 | [diff] [blame] | 134 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 135 | list_for_each_entry(tfp, head, list) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 136 | if (!tfp->skb) |
| 137 | continue; |
| 138 | |
| 139 | if (tfp->seqno == ntohs(up->seqno)) |
| 140 | goto mov_tail; |
| 141 | |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 142 | tmp_up = (struct batadv_unicast_frag_packet *)tfp->skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 143 | |
| 144 | if (tfp->seqno == search_seqno) { |
Antonio Quartulli | c1d0743 | 2013-01-15 22:17:19 +1000 | [diff] [blame^] | 145 | is_head_tmp = tmp_up->flags & BATADV_UNI_FRAG_HEAD; |
Sven Eckelmann | bbb1f90 | 2012-07-08 17:13:15 +0200 | [diff] [blame] | 146 | if (is_head_tmp != is_head) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 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 | |
Sven Eckelmann | 88ed1e77 | 2012-05-12 02:09:40 +0200 | [diff] [blame] | 159 | void batadv_frag_list_free(struct list_head *head) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 160 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 161 | struct batadv_frag_packet_list_entry *pf, *tmp_pf; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 162 | |
| 163 | if (!list_empty(head)) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 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 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 179 | int batadv_frag_reassemble_skb(struct sk_buff *skb, |
| 180 | struct batadv_priv *bat_priv, |
Sven Eckelmann | 88ed1e77 | 2012-05-12 02:09:40 +0200 | [diff] [blame] | 181 | struct sk_buff **new_skb) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 182 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 183 | struct batadv_orig_node *orig_node; |
| 184 | struct batadv_frag_packet_list_entry *tmp_frag_entry; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 185 | int ret = NET_RX_DROP; |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 186 | struct batadv_unicast_frag_packet *unicast_packet; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 187 | |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 188 | unicast_packet = (struct batadv_unicast_frag_packet *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 189 | *new_skb = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 190 | |
Sven Eckelmann | da64119 | 2012-05-12 13:48:56 +0200 | [diff] [blame] | 191 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->orig); |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 192 | if (!orig_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 193 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 194 | |
| 195 | orig_node->last_frag_packet = jiffies; |
| 196 | |
| 197 | if (list_empty(&orig_node->frag_list) && |
Sven Eckelmann | 0354440 | 2012-05-16 20:23:17 +0200 | [diff] [blame] | 198 | batadv_frag_create_buffer(&orig_node->frag_list)) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 199 | pr_debug("couldn't create frag buffer\n"); |
| 200 | goto out; |
| 201 | } |
| 202 | |
Sven Eckelmann | 0354440 | 2012-05-16 20:23:17 +0200 | [diff] [blame] | 203 | tmp_frag_entry = batadv_frag_search_packet(&orig_node->frag_list, |
| 204 | unicast_packet); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 205 | |
| 206 | if (!tmp_frag_entry) { |
Sven Eckelmann | 0354440 | 2012-05-16 20:23:17 +0200 | [diff] [blame] | 207 | batadv_frag_create_entry(&orig_node->frag_list, skb); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 208 | ret = NET_RX_SUCCESS; |
| 209 | goto out; |
| 210 | } |
| 211 | |
Sven Eckelmann | 0354440 | 2012-05-16 20:23:17 +0200 | [diff] [blame] | 212 | *new_skb = batadv_frag_merge_packet(&orig_node->frag_list, |
| 213 | tmp_frag_entry, skb); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 214 | /* if not, merge failed */ |
| 215 | if (*new_skb) |
| 216 | ret = NET_RX_SUCCESS; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 217 | |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 218 | out: |
| 219 | if (orig_node) |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 220 | batadv_orig_node_free_ref(orig_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 221 | return ret; |
| 222 | } |
| 223 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 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[]) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 227 | { |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 228 | struct batadv_unicast_packet tmp_uc, *unicast_packet; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 229 | struct batadv_hard_iface *primary_if; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 230 | struct sk_buff *frag_skb; |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 231 | struct batadv_unicast_frag_packet *frag1, *frag2; |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 232 | int uc_hdr_len = sizeof(*unicast_packet); |
| 233 | int ucf_hdr_len = sizeof(*frag1); |
Sven Eckelmann | 5c77d8b | 2011-01-25 21:59:26 +0000 | [diff] [blame] | 234 | int data_len = skb->len - uc_hdr_len; |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 235 | int large_tail = 0, ret = NET_RX_DROP; |
Sven Eckelmann | c2f7f0e | 2011-02-10 14:33:56 +0000 | [diff] [blame] | 236 | uint16_t seqno; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 237 | |
Sven Eckelmann | e5d8925 | 2012-05-12 13:48:54 +0200 | [diff] [blame] | 238 | primary_if = batadv_primary_if_get_selected(bat_priv); |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 239 | if (!primary_if) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 240 | goto dropped; |
| 241 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 242 | frag_skb = dev_alloc_skb(data_len - (data_len / 2) + ucf_hdr_len); |
Jesper Juhl | ed7809d | 2011-01-13 21:53:38 +0100 | [diff] [blame] | 243 | if (!frag_skb) |
| 244 | goto dropped; |
Sven Eckelmann | 5c77d8b | 2011-01-25 21:59:26 +0000 | [diff] [blame] | 245 | skb_reserve(frag_skb, ucf_hdr_len); |
Jesper Juhl | ed7809d | 2011-01-13 21:53:38 +0100 | [diff] [blame] | 246 | |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 247 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
Jesper Juhl | ed7809d | 2011-01-13 21:53:38 +0100 | [diff] [blame] | 248 | memcpy(&tmp_uc, unicast_packet, uc_hdr_len); |
Sven Eckelmann | 5c77d8b | 2011-01-25 21:59:26 +0000 | [diff] [blame] | 249 | skb_split(skb, frag_skb, data_len / 2 + uc_hdr_len); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 250 | |
Sven Eckelmann | 04b482a | 2012-05-12 02:09:38 +0200 | [diff] [blame] | 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) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 253 | goto drop_frag; |
| 254 | |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 255 | frag1 = (struct batadv_unicast_frag_packet *)skb->data; |
| 256 | frag2 = (struct batadv_unicast_frag_packet *)frag_skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 257 | |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 258 | memcpy(frag1, &tmp_uc, sizeof(tmp_uc)); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 259 | |
Sven Eckelmann | 76543d1 | 2011-11-20 15:47:38 +0100 | [diff] [blame] | 260 | frag1->header.ttl--; |
Sven Eckelmann | 7e071c7 | 2012-06-03 22:19:13 +0200 | [diff] [blame] | 261 | frag1->header.version = BATADV_COMPAT_VERSION; |
Sven Eckelmann | acd34af | 2012-06-03 22:19:21 +0200 | [diff] [blame] | 262 | frag1->header.packet_type = BATADV_UNICAST_FRAG; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 263 | |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 264 | memcpy(frag1->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 265 | memcpy(frag2, frag1, sizeof(*frag2)); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 266 | |
Sven Eckelmann | ae361ce | 2011-01-25 22:02:31 +0000 | [diff] [blame] | 267 | if (data_len & 1) |
Sven Eckelmann | acd34af | 2012-06-03 22:19:21 +0200 | [diff] [blame] | 268 | large_tail = BATADV_UNI_FRAG_LARGETAIL; |
Sven Eckelmann | ae361ce | 2011-01-25 22:02:31 +0000 | [diff] [blame] | 269 | |
Sven Eckelmann | acd34af | 2012-06-03 22:19:21 +0200 | [diff] [blame] | 270 | frag1->flags = BATADV_UNI_FRAG_HEAD | large_tail; |
Sven Eckelmann | ae361ce | 2011-01-25 22:02:31 +0000 | [diff] [blame] | 271 | frag2->flags = large_tail; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 272 | |
Marek Lindner | e6c10f4 | 2011-02-18 12:33:20 +0000 | [diff] [blame] | 273 | seqno = atomic_add_return(2, &hard_iface->frag_seqno); |
Sven Eckelmann | c2f7f0e | 2011-02-10 14:33:56 +0000 | [diff] [blame] | 274 | frag1->seqno = htons(seqno - 1); |
| 275 | frag2->seqno = htons(seqno); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 276 | |
Sven Eckelmann | 9455e34 | 2012-05-12 02:09:37 +0200 | [diff] [blame] | 277 | batadv_send_skb_packet(skb, hard_iface, dstaddr); |
| 278 | batadv_send_skb_packet(frag_skb, hard_iface, dstaddr); |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 279 | ret = NET_RX_SUCCESS; |
| 280 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 281 | |
| 282 | drop_frag: |
| 283 | kfree_skb(frag_skb); |
| 284 | dropped: |
| 285 | kfree_skb(skb); |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 286 | out: |
| 287 | if (primary_if) |
Sven Eckelmann | e5d8925 | 2012-05-12 13:48:54 +0200 | [diff] [blame] | 288 | batadv_hardif_free_ref(primary_if); |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 289 | return ret; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 290 | } |
| 291 | |
Antonio Quartulli | 7cdcf6d | 2012-10-01 09:57:35 +0200 | [diff] [blame] | 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 | * |
| 329 | * Returns false if the payload could not be encapsulated or true otherwise |
| 330 | */ |
| 331 | static bool batadv_unicast_prepare_skb(struct sk_buff *skb, |
| 332 | struct batadv_orig_node *orig_node) |
| 333 | { |
| 334 | size_t uni_size = sizeof(struct batadv_unicast_packet); |
| 335 | return batadv_unicast_push_and_fill_skb(skb, uni_size, orig_node); |
| 336 | } |
| 337 | |
| 338 | /** |
| 339 | * batadv_unicast_4addr_prepare_skb - encapsulate an skb with a unicast4addr |
| 340 | * header |
| 341 | * @bat_priv: the bat priv with all the soft interface information |
| 342 | * @skb: the skb containing the payload to encapsulate |
| 343 | * @orig_node: the destination node |
| 344 | * @packet_subtype: the batman 4addr packet subtype to use |
| 345 | * |
| 346 | * Returns false if the payload could not be encapsulated or true otherwise |
| 347 | */ |
Antonio Quartulli | 785ea11 | 2011-11-23 11:35:44 +0100 | [diff] [blame] | 348 | bool batadv_unicast_4addr_prepare_skb(struct batadv_priv *bat_priv, |
| 349 | struct sk_buff *skb, |
| 350 | struct batadv_orig_node *orig, |
| 351 | int packet_subtype) |
Antonio Quartulli | 7cdcf6d | 2012-10-01 09:57:35 +0200 | [diff] [blame] | 352 | { |
| 353 | struct batadv_hard_iface *primary_if; |
| 354 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
| 355 | bool ret = false; |
| 356 | |
| 357 | primary_if = batadv_primary_if_get_selected(bat_priv); |
| 358 | if (!primary_if) |
| 359 | goto out; |
| 360 | |
| 361 | /* pull the header space and fill the unicast_packet substructure. |
| 362 | * We can do that because the first member of the unicast_4addr_packet |
| 363 | * is of type struct unicast_packet |
| 364 | */ |
| 365 | if (!batadv_unicast_push_and_fill_skb(skb, |
| 366 | sizeof(*unicast_4addr_packet), |
| 367 | orig)) |
| 368 | goto out; |
| 369 | |
| 370 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
| 371 | unicast_4addr_packet->u.header.packet_type = BATADV_UNICAST_4ADDR; |
| 372 | memcpy(unicast_4addr_packet->src, primary_if->net_dev->dev_addr, |
| 373 | ETH_ALEN); |
| 374 | unicast_4addr_packet->subtype = packet_subtype; |
| 375 | unicast_4addr_packet->reserved = 0; |
| 376 | |
| 377 | ret = true; |
| 378 | out: |
| 379 | if (primary_if) |
| 380 | batadv_hardif_free_ref(primary_if); |
| 381 | return ret; |
| 382 | } |
| 383 | |
| 384 | /** |
| 385 | * batadv_unicast_generic_send_skb - send an skb as unicast |
| 386 | * @bat_priv: the bat priv with all the soft interface information |
| 387 | * @skb: payload to send |
| 388 | * @packet_type: the batman unicast packet type to use |
| 389 | * @packet_subtype: the batman packet subtype. It is ignored if packet_type is |
| 390 | * not BATADV_UNICAT_4ADDR |
| 391 | * |
| 392 | * Returns 1 in case of error or 0 otherwise |
| 393 | */ |
| 394 | int batadv_unicast_generic_send_skb(struct batadv_priv *bat_priv, |
| 395 | struct sk_buff *skb, int packet_type, |
| 396 | int packet_subtype) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 397 | { |
| 398 | struct ethhdr *ethhdr = (struct ethhdr *)skb->data; |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 399 | struct batadv_unicast_packet *unicast_packet; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 400 | struct batadv_orig_node *orig_node; |
| 401 | struct batadv_neigh_node *neigh_node; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 402 | int data_len = skb->len; |
Martin Hundebøll | bb351ba | 2012-10-16 16:13:48 +0200 | [diff] [blame] | 403 | int ret = NET_RX_DROP; |
Sven Eckelmann | 0aca236 | 2012-06-19 20:26:30 +0200 | [diff] [blame] | 404 | unsigned int dev_mtu; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 405 | |
| 406 | /* get routing information */ |
Linus Lüssing | 43c70ad | 2011-02-13 21:13:04 +0000 | [diff] [blame] | 407 | if (is_multicast_ether_addr(ethhdr->h_dest)) { |
Sven Eckelmann | 7cf06bc | 2012-05-12 02:09:29 +0200 | [diff] [blame] | 408 | orig_node = batadv_gw_get_selected_orig(bat_priv); |
Linus Lüssing | 43c70ad | 2011-02-13 21:13:04 +0000 | [diff] [blame] | 409 | if (orig_node) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 410 | goto find_router; |
| 411 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 412 | |
Antonio Quartulli | 3d393e4 | 2011-07-07 15:35:37 +0200 | [diff] [blame] | 413 | /* check for tt host - increases orig_node refcount. |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 414 | * returns NULL in case of AP isolation |
| 415 | */ |
Sven Eckelmann | 08c36d3 | 2012-05-12 02:09:39 +0200 | [diff] [blame] | 416 | orig_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
| 417 | ethhdr->h_dest); |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 418 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 419 | find_router: |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 420 | /* find_router(): |
Marek Lindner | d007260 | 2011-01-19 20:01:44 +0000 | [diff] [blame] | 421 | * - if orig_node is NULL it returns NULL |
| 422 | * - increases neigh_nodes refcount if found. |
| 423 | */ |
Sven Eckelmann | 30d3c51 | 2012-05-12 02:09:36 +0200 | [diff] [blame] | 424 | neigh_node = batadv_find_router(bat_priv, orig_node, NULL); |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 425 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 426 | if (!neigh_node) |
Marek Lindner | d007260 | 2011-01-19 20:01:44 +0000 | [diff] [blame] | 427 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 428 | |
Antonio Quartulli | 7cdcf6d | 2012-10-01 09:57:35 +0200 | [diff] [blame] | 429 | switch (packet_type) { |
| 430 | case BATADV_UNICAST: |
| 431 | batadv_unicast_prepare_skb(skb, orig_node); |
| 432 | break; |
| 433 | case BATADV_UNICAST_4ADDR: |
| 434 | batadv_unicast_4addr_prepare_skb(bat_priv, skb, orig_node, |
| 435 | packet_subtype); |
| 436 | break; |
| 437 | default: |
| 438 | /* this function supports UNICAST and UNICAST_4ADDR only. It |
| 439 | * should never be invoked with any other packet type |
| 440 | */ |
Marek Lindner | d007260 | 2011-01-19 20:01:44 +0000 | [diff] [blame] | 441 | goto out; |
Antonio Quartulli | 7cdcf6d | 2012-10-01 09:57:35 +0200 | [diff] [blame] | 442 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 443 | |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 444 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 445 | |
Antonio Quartulli | 3275e7c | 2012-03-16 18:03:28 +0100 | [diff] [blame] | 446 | /* inform the destination node that we are still missing a correct route |
| 447 | * for this client. The destination will receive this packet and will |
| 448 | * try to reroute it because the ttvn contained in the header is less |
| 449 | * than the current one |
| 450 | */ |
Sven Eckelmann | 08c36d3 | 2012-05-12 02:09:39 +0200 | [diff] [blame] | 451 | if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest)) |
Antonio Quartulli | 3275e7c | 2012-03-16 18:03:28 +0100 | [diff] [blame] | 452 | unicast_packet->ttvn = unicast_packet->ttvn - 1; |
| 453 | |
Sven Eckelmann | 0aca236 | 2012-06-19 20:26:30 +0200 | [diff] [blame] | 454 | dev_mtu = neigh_node->if_incoming->net_dev->mtu; |
Antonio Quartulli | 7cdcf6d | 2012-10-01 09:57:35 +0200 | [diff] [blame] | 455 | /* fragmentation mechanism only works for UNICAST (now) */ |
| 456 | if (packet_type == BATADV_UNICAST && |
| 457 | atomic_read(&bat_priv->fragmentation) && |
Sven Eckelmann | 0aca236 | 2012-06-19 20:26:30 +0200 | [diff] [blame] | 458 | data_len + sizeof(*unicast_packet) > dev_mtu) { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 459 | /* send frag skb decreases ttl */ |
Sven Eckelmann | 76543d1 | 2011-11-20 15:47:38 +0100 | [diff] [blame] | 460 | unicast_packet->header.ttl++; |
Sven Eckelmann | 88ed1e77 | 2012-05-12 02:09:40 +0200 | [diff] [blame] | 461 | ret = batadv_frag_send_skb(skb, bat_priv, |
| 462 | neigh_node->if_incoming, |
| 463 | neigh_node->addr); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 464 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 465 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 466 | |
Martin Hundebøll | bb351ba | 2012-10-16 16:13:48 +0200 | [diff] [blame] | 467 | if (batadv_send_skb_to_orig(skb, orig_node, NULL)) |
| 468 | ret = 0; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 469 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 470 | out: |
| 471 | if (neigh_node) |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 472 | batadv_neigh_node_free_ref(neigh_node); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 473 | if (orig_node) |
Sven Eckelmann | 7d211ef | 2012-05-12 02:09:34 +0200 | [diff] [blame] | 474 | batadv_orig_node_free_ref(orig_node); |
Martin Hundebøll | bb351ba | 2012-10-16 16:13:48 +0200 | [diff] [blame] | 475 | if (ret == NET_RX_DROP) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 476 | kfree_skb(skb); |
| 477 | return ret; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 478 | } |