Sven Eckelmann | 0046b04 | 2016-01-01 00:01:03 +0100 | [diff] [blame] | 1 | /* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 2 | * |
| 3 | * Marek Lindner, Simon Wunderlich |
| 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 |
Antonio Quartulli | ebf38fb | 2013-11-03 20:40:48 +0100 | [diff] [blame] | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 16 | */ |
| 17 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 18 | #include "routing.h" |
Sven Eckelmann | 1e2c2a4 | 2015-04-17 19:40:28 +0200 | [diff] [blame] | 19 | #include "main.h" |
| 20 | |
| 21 | #include <linux/atomic.h> |
| 22 | #include <linux/byteorder/generic.h> |
| 23 | #include <linux/compiler.h> |
| 24 | #include <linux/errno.h> |
| 25 | #include <linux/etherdevice.h> |
| 26 | #include <linux/if_ether.h> |
| 27 | #include <linux/jiffies.h> |
Sven Eckelmann | a6ba0d3 | 2016-01-16 10:29:52 +0100 | [diff] [blame] | 28 | #include <linux/kref.h> |
Sven Eckelmann | 1e2c2a4 | 2015-04-17 19:40:28 +0200 | [diff] [blame] | 29 | #include <linux/netdevice.h> |
| 30 | #include <linux/printk.h> |
| 31 | #include <linux/rculist.h> |
| 32 | #include <linux/rcupdate.h> |
| 33 | #include <linux/skbuff.h> |
| 34 | #include <linux/spinlock.h> |
| 35 | #include <linux/stddef.h> |
| 36 | |
| 37 | #include "bitarray.h" |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 38 | #include "bridge_loop_avoidance.h" |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 39 | #include "distributed-arp-table.h" |
Martin Hundebøll | 610bfc6bc | 2013-05-23 16:53:02 +0200 | [diff] [blame] | 40 | #include "fragmentation.h" |
Sven Eckelmann | 1e2c2a4 | 2015-04-17 19:40:28 +0200 | [diff] [blame] | 41 | #include "hard-interface.h" |
| 42 | #include "icmp_socket.h" |
| 43 | #include "network-coding.h" |
| 44 | #include "originator.h" |
| 45 | #include "packet.h" |
| 46 | #include "send.h" |
| 47 | #include "soft-interface.h" |
| 48 | #include "translation-table.h" |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 49 | |
Sven Eckelmann | 63b0103 | 2012-05-16 20:23:13 +0200 | [diff] [blame] | 50 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 51 | struct batadv_hard_iface *recv_if); |
Simon Wunderlich | a7f6ee9 | 2012-01-22 20:00:18 +0100 | [diff] [blame] | 52 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 53 | /** |
| 54 | * _batadv_update_route - set the router for this originator |
| 55 | * @bat_priv: the bat priv with all the soft interface information |
| 56 | * @orig_node: orig node which is to be configured |
| 57 | * @recv_if: the receive interface for which this route is set |
| 58 | * @neigh_node: neighbor which should be the next router |
| 59 | * |
| 60 | * This function does not perform any error checks |
| 61 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 62 | static void _batadv_update_route(struct batadv_priv *bat_priv, |
| 63 | struct batadv_orig_node *orig_node, |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 64 | struct batadv_hard_iface *recv_if, |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 65 | struct batadv_neigh_node *neigh_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 66 | { |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 67 | struct batadv_orig_ifinfo *orig_ifinfo; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 68 | struct batadv_neigh_node *curr_router; |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 69 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 70 | orig_ifinfo = batadv_orig_ifinfo_get(orig_node, recv_if); |
| 71 | if (!orig_ifinfo) |
| 72 | return; |
| 73 | |
| 74 | rcu_read_lock(); |
| 75 | curr_router = rcu_dereference(orig_ifinfo->router); |
Sven Eckelmann | 77ae32e | 2016-01-16 10:29:53 +0100 | [diff] [blame] | 76 | if (curr_router && !kref_get_unless_zero(&curr_router->refcount)) |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 77 | curr_router = NULL; |
| 78 | rcu_read_unlock(); |
Marek Lindner | a8e7f4b | 2010-12-12 21:57:10 +0000 | [diff] [blame] | 79 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 80 | /* route deleted */ |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 81 | if ((curr_router) && (!neigh_node)) { |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 82 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
| 83 | "Deleting route towards: %pM\n", orig_node->orig); |
Antonio Quartulli | 95fb130 | 2013-08-07 18:28:55 +0200 | [diff] [blame] | 84 | batadv_tt_global_del_orig(bat_priv, orig_node, -1, |
Sven Eckelmann | 08c36d3 | 2012-05-12 02:09:39 +0200 | [diff] [blame] | 85 | "Deleted route towards originator"); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 86 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 87 | /* route added */ |
| 88 | } else if ((!curr_router) && (neigh_node)) { |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 89 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 90 | "Adding route towards: %pM (via %pM)\n", |
| 91 | orig_node->orig, neigh_node->addr); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 92 | /* route changed */ |
Sven Eckelmann | bb899b8 | 2011-05-10 11:22:37 +0200 | [diff] [blame] | 93 | } else if (neigh_node && curr_router) { |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 94 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 95 | "Changing route towards: %pM (now via %pM - was via %pM)\n", |
| 96 | orig_node->orig, neigh_node->addr, |
| 97 | curr_router->addr); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 98 | } |
| 99 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 100 | if (curr_router) |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 101 | batadv_neigh_node_put(curr_router); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 102 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 103 | spin_lock_bh(&orig_node->neigh_list_lock); |
Sven Eckelmann | d1a65f1 | 2016-03-20 12:27:53 +0100 | [diff] [blame] | 104 | /* curr_router used earlier may not be the current orig_ifinfo->router |
| 105 | * anymore because it was dereferenced outside of the neigh_list_lock |
| 106 | * protected region. After the new best neighbor has replace the current |
| 107 | * best neighbor the reference counter needs to decrease. Consequently, |
| 108 | * the code needs to ensure the curr_router variable contains a pointer |
| 109 | * to the replaced best neighbor. |
| 110 | */ |
| 111 | curr_router = rcu_dereference_protected(orig_ifinfo->router, true); |
| 112 | |
Sven Eckelmann | f0b94eb | 2016-03-05 19:05:24 +0100 | [diff] [blame] | 113 | /* increase refcount of new best neighbor */ |
| 114 | if (neigh_node) |
| 115 | kref_get(&neigh_node->refcount); |
| 116 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 117 | rcu_assign_pointer(orig_ifinfo->router, neigh_node); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 118 | spin_unlock_bh(&orig_node->neigh_list_lock); |
Sven Eckelmann | 35f9477 | 2016-01-17 11:01:13 +0100 | [diff] [blame] | 119 | batadv_orig_ifinfo_put(orig_ifinfo); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 120 | |
| 121 | /* decrease refcount of previous best neighbor */ |
| 122 | if (curr_router) |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 123 | batadv_neigh_node_put(curr_router); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 124 | } |
| 125 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 126 | /** |
| 127 | * batadv_update_route - set the router for this originator |
| 128 | * @bat_priv: the bat priv with all the soft interface information |
| 129 | * @orig_node: orig node which is to be configured |
| 130 | * @recv_if: the receive interface for which this route is set |
| 131 | * @neigh_node: neighbor which should be the next router |
| 132 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 133 | void batadv_update_route(struct batadv_priv *bat_priv, |
| 134 | struct batadv_orig_node *orig_node, |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 135 | struct batadv_hard_iface *recv_if, |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 136 | struct batadv_neigh_node *neigh_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 137 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 138 | struct batadv_neigh_node *router = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 139 | |
| 140 | if (!orig_node) |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 141 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 142 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 143 | router = batadv_orig_router_get(orig_node, recv_if); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 144 | |
| 145 | if (router != neigh_node) |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 146 | _batadv_update_route(bat_priv, orig_node, recv_if, neigh_node); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 147 | |
| 148 | out: |
| 149 | if (router) |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 150 | batadv_neigh_node_put(router); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 151 | } |
| 152 | |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 153 | /** |
Sven Eckelmann | 7afcbbe | 2015-10-31 12:29:29 +0100 | [diff] [blame] | 154 | * batadv_window_protected - checks whether the host restarted and is in the |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 155 | * protection time. |
Sven Eckelmann | 7afcbbe | 2015-10-31 12:29:29 +0100 | [diff] [blame] | 156 | * @bat_priv: the bat priv with all the soft interface information |
| 157 | * @seq_num_diff: difference between the current/received sequence number and |
| 158 | * the last sequence number |
Simon Wunderlich | 81f0268 | 2015-11-23 19:57:22 +0100 | [diff] [blame] | 159 | * @seq_old_max_diff: maximum age of sequence number not considered as restart |
Sven Eckelmann | 7afcbbe | 2015-10-31 12:29:29 +0100 | [diff] [blame] | 160 | * @last_reset: jiffies timestamp of the last reset, will be updated when reset |
| 161 | * is detected |
Simon Wunderlich | 81f0268 | 2015-11-23 19:57:22 +0100 | [diff] [blame] | 162 | * @protection_started: is set to true if the protection window was started, |
| 163 | * doesn't change otherwise. |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 164 | * |
| 165 | * Return: |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 166 | * false if the packet is to be accepted. |
| 167 | * true if the packet is to be ignored. |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 168 | */ |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 169 | bool batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff, |
| 170 | s32 seq_old_max_diff, unsigned long *last_reset, |
| 171 | bool *protection_started) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 172 | { |
Simon Wunderlich | 81f0268 | 2015-11-23 19:57:22 +0100 | [diff] [blame] | 173 | if (seq_num_diff <= -seq_old_max_diff || |
Sven Eckelmann | 42d0b04 | 2012-06-03 22:19:17 +0200 | [diff] [blame] | 174 | seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { |
| 175 | if (!batadv_has_timed_out(*last_reset, |
| 176 | BATADV_RESET_PROTECTION_MS)) |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 177 | return true; |
Marek Lindner | 8c7bf24 | 2012-03-17 15:28:33 +0800 | [diff] [blame] | 178 | |
| 179 | *last_reset = jiffies; |
Simon Wunderlich | 81f0268 | 2015-11-23 19:57:22 +0100 | [diff] [blame] | 180 | if (protection_started) |
| 181 | *protection_started = true; |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 182 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 183 | "old packet received, start protection\n"); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 184 | } |
Marek Lindner | 8c7bf24 | 2012-03-17 15:28:33 +0800 | [diff] [blame] | 185 | |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 186 | return false; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 187 | } |
| 188 | |
Sven Eckelmann | 30d3c51 | 2012-05-12 02:09:36 +0200 | [diff] [blame] | 189 | bool batadv_check_management_packet(struct sk_buff *skb, |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 190 | struct batadv_hard_iface *hard_iface, |
Sven Eckelmann | 30d3c51 | 2012-05-12 02:09:36 +0200 | [diff] [blame] | 191 | int header_len) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 192 | { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 193 | struct ethhdr *ethhdr; |
| 194 | |
| 195 | /* drop packet if it has not necessary minimum size */ |
Marek Lindner | c3e2931 | 2012-03-04 16:56:25 +0800 | [diff] [blame] | 196 | if (unlikely(!pskb_may_pull(skb, header_len))) |
| 197 | return false; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 198 | |
Antonio Quartulli | 7ed4be9 | 2013-04-08 15:08:18 +0200 | [diff] [blame] | 199 | ethhdr = eth_hdr(skb); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 200 | |
| 201 | /* packet with broadcast indication but unicast recipient */ |
| 202 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) |
Marek Lindner | c3e2931 | 2012-03-04 16:56:25 +0800 | [diff] [blame] | 203 | return false; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 204 | |
| 205 | /* packet with broadcast sender address */ |
| 206 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
Marek Lindner | c3e2931 | 2012-03-04 16:56:25 +0800 | [diff] [blame] | 207 | return false; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 208 | |
| 209 | /* create a copy of the skb, if needed, to modify it. */ |
| 210 | if (skb_cow(skb, 0) < 0) |
Marek Lindner | c3e2931 | 2012-03-04 16:56:25 +0800 | [diff] [blame] | 211 | return false; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 212 | |
| 213 | /* keep skb linear */ |
| 214 | if (skb_linearize(skb) < 0) |
Marek Lindner | c3e2931 | 2012-03-04 16:56:25 +0800 | [diff] [blame] | 215 | return false; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 216 | |
Marek Lindner | c3e2931 | 2012-03-04 16:56:25 +0800 | [diff] [blame] | 217 | return true; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 218 | } |
| 219 | |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 220 | /** |
| 221 | * batadv_recv_my_icmp_packet - receive an icmp packet locally |
| 222 | * @bat_priv: the bat priv with all the soft interface information |
| 223 | * @skb: icmp packet to process |
| 224 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 225 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 226 | * otherwise. |
| 227 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 228 | static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 229 | struct sk_buff *skb) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 230 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 231 | struct batadv_hard_iface *primary_if = NULL; |
| 232 | struct batadv_orig_node *orig_node = NULL; |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 233 | struct batadv_icmp_header *icmph; |
| 234 | int res, ret = NET_RX_DROP; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 235 | |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 236 | icmph = (struct batadv_icmp_header *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 237 | |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 238 | switch (icmph->msg_type) { |
| 239 | case BATADV_ECHO_REPLY: |
| 240 | case BATADV_DESTINATION_UNREACHABLE: |
| 241 | case BATADV_TTL_EXCEEDED: |
| 242 | /* receive the packet */ |
| 243 | if (skb_linearize(skb) < 0) |
| 244 | break; |
| 245 | |
| 246 | batadv_socket_receive_packet(icmph, skb->len); |
| 247 | break; |
| 248 | case BATADV_ECHO_REQUEST: |
| 249 | /* answer echo request (ping) */ |
| 250 | primary_if = batadv_primary_if_get_selected(bat_priv); |
| 251 | if (!primary_if) |
| 252 | goto out; |
| 253 | |
| 254 | /* get routing information */ |
| 255 | orig_node = batadv_orig_hash_find(bat_priv, icmph->orig); |
| 256 | if (!orig_node) |
| 257 | goto out; |
| 258 | |
| 259 | /* create a copy of the skb, if needed, to modify it. */ |
| 260 | if (skb_cow(skb, ETH_HLEN) < 0) |
| 261 | goto out; |
| 262 | |
| 263 | icmph = (struct batadv_icmp_header *)skb->data; |
| 264 | |
Antonio Quartulli | 8fdd015 | 2014-01-22 00:42:11 +0100 | [diff] [blame] | 265 | ether_addr_copy(icmph->dst, icmph->orig); |
| 266 | ether_addr_copy(icmph->orig, primary_if->net_dev->dev_addr); |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 267 | icmph->msg_type = BATADV_ECHO_REPLY; |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 268 | icmph->ttl = BATADV_TTL; |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 269 | |
| 270 | res = batadv_send_skb_to_orig(skb, orig_node, NULL); |
| 271 | if (res != NET_XMIT_DROP) |
| 272 | ret = NET_RX_SUCCESS; |
| 273 | |
| 274 | break; |
| 275 | default: |
| 276 | /* drop unknown type */ |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 277 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 278 | } |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 279 | out: |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 280 | if (primary_if) |
Sven Eckelmann | 82047ad | 2016-01-17 11:01:10 +0100 | [diff] [blame] | 281 | batadv_hardif_put(primary_if); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 282 | if (orig_node) |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 283 | batadv_orig_node_put(orig_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 284 | return ret; |
| 285 | } |
| 286 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 287 | static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, |
Sven Eckelmann | 63b0103 | 2012-05-16 20:23:13 +0200 | [diff] [blame] | 288 | struct sk_buff *skb) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 289 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 290 | struct batadv_hard_iface *primary_if = NULL; |
| 291 | struct batadv_orig_node *orig_node = NULL; |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 292 | struct batadv_icmp_packet *icmp_packet; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 293 | int ret = NET_RX_DROP; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 294 | |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 295 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 296 | |
| 297 | /* send TTL exceeded if packet is an echo request (traceroute) */ |
Antonio Quartulli | 27a417e | 2013-12-05 15:33:00 +0100 | [diff] [blame] | 298 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
Sven Eckelmann | 86ceb36 | 2012-03-07 09:07:45 +0100 | [diff] [blame] | 299 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
Antonio Quartulli | 27a417e | 2013-12-05 15:33:00 +0100 | [diff] [blame] | 300 | icmp_packet->orig, icmp_packet->dst); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 301 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 302 | } |
| 303 | |
Sven Eckelmann | e5d8925 | 2012-05-12 13:48:54 +0200 | [diff] [blame] | 304 | primary_if = batadv_primary_if_get_selected(bat_priv); |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 305 | if (!primary_if) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 306 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 307 | |
| 308 | /* get routing information */ |
Antonio Quartulli | 27a417e | 2013-12-05 15:33:00 +0100 | [diff] [blame] | 309 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 310 | if (!orig_node) |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 311 | goto out; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 312 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 313 | /* create a copy of the skb, if needed, to modify it. */ |
Antonio Quartulli | 0d12507 | 2012-02-18 11:27:34 +0100 | [diff] [blame] | 314 | if (skb_cow(skb, ETH_HLEN) < 0) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 315 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 316 | |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 317 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 318 | |
Antonio Quartulli | 8fdd015 | 2014-01-22 00:42:11 +0100 | [diff] [blame] | 319 | ether_addr_copy(icmp_packet->dst, icmp_packet->orig); |
| 320 | ether_addr_copy(icmp_packet->orig, primary_if->net_dev->dev_addr); |
Antonio Quartulli | 27a417e | 2013-12-05 15:33:00 +0100 | [diff] [blame] | 321 | icmp_packet->msg_type = BATADV_TTL_EXCEEDED; |
| 322 | icmp_packet->ttl = BATADV_TTL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 323 | |
Martin Hundebøll | e91ecfc | 2013-04-20 13:54:39 +0200 | [diff] [blame] | 324 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) |
Martin Hundebøll | bb351ba | 2012-10-16 16:13:48 +0200 | [diff] [blame] | 325 | ret = NET_RX_SUCCESS; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 326 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 327 | out: |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 328 | if (primary_if) |
Sven Eckelmann | 82047ad | 2016-01-17 11:01:10 +0100 | [diff] [blame] | 329 | batadv_hardif_put(primary_if); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 330 | if (orig_node) |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 331 | batadv_orig_node_put(orig_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 332 | return ret; |
| 333 | } |
| 334 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 335 | int batadv_recv_icmp_packet(struct sk_buff *skb, |
| 336 | struct batadv_hard_iface *recv_if) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 337 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 338 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 339 | struct batadv_icmp_header *icmph; |
| 340 | struct batadv_icmp_packet_rr *icmp_packet_rr; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 341 | struct ethhdr *ethhdr; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 342 | struct batadv_orig_node *orig_node = NULL; |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 343 | int hdr_size = sizeof(struct batadv_icmp_header); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 344 | int ret = NET_RX_DROP; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 345 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 346 | /* drop packet if it has not necessary minimum size */ |
| 347 | if (unlikely(!pskb_may_pull(skb, hdr_size))) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 348 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 349 | |
Antonio Quartulli | 7ed4be9 | 2013-04-08 15:08:18 +0200 | [diff] [blame] | 350 | ethhdr = eth_hdr(skb); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 351 | |
| 352 | /* packet with unicast indication but broadcast recipient */ |
| 353 | if (is_broadcast_ether_addr(ethhdr->h_dest)) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 354 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 355 | |
| 356 | /* packet with broadcast sender address */ |
| 357 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 358 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 359 | |
| 360 | /* not for me */ |
Antonio Quartulli | fe8a93b | 2013-04-03 19:10:26 +0200 | [diff] [blame] | 361 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 362 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 363 | |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 364 | icmph = (struct batadv_icmp_header *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 365 | |
| 366 | /* add record route information if not full */ |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 367 | if ((icmph->msg_type == BATADV_ECHO_REPLY || |
| 368 | icmph->msg_type == BATADV_ECHO_REQUEST) && |
| 369 | (skb->len >= sizeof(struct batadv_icmp_packet_rr))) { |
| 370 | if (skb_linearize(skb) < 0) |
| 371 | goto out; |
| 372 | |
| 373 | /* create a copy of the skb, if needed, to modify it. */ |
| 374 | if (skb_cow(skb, ETH_HLEN) < 0) |
| 375 | goto out; |
| 376 | |
| 377 | icmph = (struct batadv_icmp_header *)skb->data; |
| 378 | icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph; |
| 379 | if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN) |
| 380 | goto out; |
| 381 | |
Antonio Quartulli | 8fdd015 | 2014-01-22 00:42:11 +0100 | [diff] [blame] | 382 | ether_addr_copy(icmp_packet_rr->rr[icmp_packet_rr->rr_cur], |
| 383 | ethhdr->h_dest); |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 384 | icmp_packet_rr->rr_cur++; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 385 | } |
| 386 | |
| 387 | /* packet for me */ |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 388 | if (batadv_is_my_mac(bat_priv, icmph->dst)) |
| 389 | return batadv_recv_my_icmp_packet(bat_priv, skb); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 390 | |
| 391 | /* TTL exceeded */ |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 392 | if (icmph->ttl < 2) |
Sven Eckelmann | 63b0103 | 2012-05-16 20:23:13 +0200 | [diff] [blame] | 393 | return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 394 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 395 | /* get routing information */ |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 396 | orig_node = batadv_orig_hash_find(bat_priv, icmph->dst); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 397 | if (!orig_node) |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 398 | goto out; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 399 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 400 | /* create a copy of the skb, if needed, to modify it. */ |
Antonio Quartulli | 0d12507 | 2012-02-18 11:27:34 +0100 | [diff] [blame] | 401 | if (skb_cow(skb, ETH_HLEN) < 0) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 402 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 403 | |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 404 | icmph = (struct batadv_icmp_header *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 405 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 406 | /* decrement ttl */ |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 407 | icmph->ttl--; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 408 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 409 | /* route it */ |
Martin Hundebøll | e91ecfc | 2013-04-20 13:54:39 +0200 | [diff] [blame] | 410 | if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP) |
Martin Hundebøll | bb351ba | 2012-10-16 16:13:48 +0200 | [diff] [blame] | 411 | ret = NET_RX_SUCCESS; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 412 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 413 | out: |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 414 | if (orig_node) |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 415 | batadv_orig_node_put(orig_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 416 | return ret; |
| 417 | } |
| 418 | |
Martin Hundebøll | f86ce0a | 2013-01-14 00:20:32 +0100 | [diff] [blame] | 419 | /** |
| 420 | * batadv_check_unicast_packet - Check for malformed unicast packets |
David S. Miller | 6e0895c | 2013-04-22 20:32:51 -0400 | [diff] [blame] | 421 | * @bat_priv: the bat priv with all the soft interface information |
Martin Hundebøll | f86ce0a | 2013-01-14 00:20:32 +0100 | [diff] [blame] | 422 | * @skb: packet to check |
| 423 | * @hdr_size: size of header to pull |
| 424 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 425 | * Check for short header and bad addresses in given packet. |
| 426 | * |
| 427 | * Return: negative value when check fails and 0 otherwise. The negative value |
| 428 | * depends on the reason: -ENODATA for bad header, -EBADR for broadcast |
| 429 | * destination or source, and -EREMOTE for non-local (other host) destination. |
Martin Hundebøll | f86ce0a | 2013-01-14 00:20:32 +0100 | [diff] [blame] | 430 | */ |
Antonio Quartulli | fe8a93b | 2013-04-03 19:10:26 +0200 | [diff] [blame] | 431 | static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, |
| 432 | struct sk_buff *skb, int hdr_size) |
Martin Hundebøll | ff51fd7 | 2012-07-05 11:34:27 +0200 | [diff] [blame] | 433 | { |
| 434 | struct ethhdr *ethhdr; |
| 435 | |
| 436 | /* drop packet if it has not necessary minimum size */ |
| 437 | if (unlikely(!pskb_may_pull(skb, hdr_size))) |
Martin Hundebøll | f86ce0a | 2013-01-14 00:20:32 +0100 | [diff] [blame] | 438 | return -ENODATA; |
Martin Hundebøll | ff51fd7 | 2012-07-05 11:34:27 +0200 | [diff] [blame] | 439 | |
Antonio Quartulli | 7ed4be9 | 2013-04-08 15:08:18 +0200 | [diff] [blame] | 440 | ethhdr = eth_hdr(skb); |
Martin Hundebøll | ff51fd7 | 2012-07-05 11:34:27 +0200 | [diff] [blame] | 441 | |
| 442 | /* packet with unicast indication but broadcast recipient */ |
| 443 | if (is_broadcast_ether_addr(ethhdr->h_dest)) |
Martin Hundebøll | f86ce0a | 2013-01-14 00:20:32 +0100 | [diff] [blame] | 444 | return -EBADR; |
Martin Hundebøll | ff51fd7 | 2012-07-05 11:34:27 +0200 | [diff] [blame] | 445 | |
| 446 | /* packet with broadcast sender address */ |
| 447 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
Martin Hundebøll | f86ce0a | 2013-01-14 00:20:32 +0100 | [diff] [blame] | 448 | return -EBADR; |
Martin Hundebøll | ff51fd7 | 2012-07-05 11:34:27 +0200 | [diff] [blame] | 449 | |
| 450 | /* not for me */ |
Antonio Quartulli | fe8a93b | 2013-04-03 19:10:26 +0200 | [diff] [blame] | 451 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
Martin Hundebøll | f86ce0a | 2013-01-14 00:20:32 +0100 | [diff] [blame] | 452 | return -EREMOTE; |
Martin Hundebøll | ff51fd7 | 2012-07-05 11:34:27 +0200 | [diff] [blame] | 453 | |
| 454 | return 0; |
| 455 | } |
| 456 | |
Simon Wunderlich | f6c8b71 | 2013-11-13 19:14:45 +0100 | [diff] [blame] | 457 | /** |
| 458 | * batadv_find_router - find a suitable router for this originator |
| 459 | * @bat_priv: the bat priv with all the soft interface information |
| 460 | * @orig_node: the destination node |
| 461 | * @recv_if: pointer to interface this packet was received on |
| 462 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 463 | * Return: the router which should be used for this orig_node on |
Simon Wunderlich | f6c8b71 | 2013-11-13 19:14:45 +0100 | [diff] [blame] | 464 | * this interface, or NULL if not available. |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 465 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 466 | struct batadv_neigh_node * |
| 467 | batadv_find_router(struct batadv_priv *bat_priv, |
| 468 | struct batadv_orig_node *orig_node, |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 469 | struct batadv_hard_iface *recv_if) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 470 | { |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 471 | struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; |
| 472 | struct batadv_neigh_node *first_candidate_router = NULL; |
| 473 | struct batadv_neigh_node *next_candidate_router = NULL; |
| 474 | struct batadv_neigh_node *router, *cand_router = NULL; |
| 475 | struct batadv_neigh_node *last_cand_router = NULL; |
| 476 | struct batadv_orig_ifinfo *cand, *first_candidate = NULL; |
| 477 | struct batadv_orig_ifinfo *next_candidate = NULL; |
| 478 | struct batadv_orig_ifinfo *last_candidate; |
| 479 | bool last_candidate_found = false; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 480 | |
| 481 | if (!orig_node) |
| 482 | return NULL; |
| 483 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 484 | router = batadv_orig_router_get(orig_node, recv_if); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 485 | |
Simon Wunderlich | 329887a | 2014-08-13 14:26:56 +0200 | [diff] [blame] | 486 | if (!router) |
| 487 | return router; |
| 488 | |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 489 | /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop) |
| 490 | * and if activated. |
| 491 | */ |
Simon Wunderlich | 329887a | 2014-08-13 14:26:56 +0200 | [diff] [blame] | 492 | if (!(recv_if == BATADV_IF_DEFAULT && atomic_read(&bat_priv->bonding))) |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 493 | return router; |
| 494 | |
| 495 | /* bonding: loop through the list of possible routers found |
| 496 | * for the various outgoing interfaces and find a candidate after |
| 497 | * the last chosen bonding candidate (next_candidate). If no such |
| 498 | * router is found, use the first candidate found (the previously |
| 499 | * chosen bonding candidate might have been the last one in the list). |
Antonio Quartulli | 3f68785 | 2014-11-02 11:29:56 +0100 | [diff] [blame] | 500 | * If this can't be found either, return the previously chosen |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 501 | * router - obviously there are no other candidates. |
| 502 | */ |
| 503 | rcu_read_lock(); |
| 504 | last_candidate = orig_node->last_bonding_candidate; |
| 505 | if (last_candidate) |
| 506 | last_cand_router = rcu_dereference(last_candidate->router); |
| 507 | |
| 508 | hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) { |
| 509 | /* acquire some structures and references ... */ |
Sven Eckelmann | a6ba0d3 | 2016-01-16 10:29:52 +0100 | [diff] [blame] | 510 | if (!kref_get_unless_zero(&cand->refcount)) |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 511 | continue; |
| 512 | |
| 513 | cand_router = rcu_dereference(cand->router); |
| 514 | if (!cand_router) |
| 515 | goto next; |
| 516 | |
Sven Eckelmann | 77ae32e | 2016-01-16 10:29:53 +0100 | [diff] [blame] | 517 | if (!kref_get_unless_zero(&cand_router->refcount)) { |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 518 | cand_router = NULL; |
| 519 | goto next; |
| 520 | } |
| 521 | |
| 522 | /* alternative candidate should be good enough to be |
| 523 | * considered |
| 524 | */ |
Simon Wunderlich | 18165f6 | 2015-08-08 02:01:50 +0200 | [diff] [blame] | 525 | if (!bao->bat_neigh_is_similar_or_better(cand_router, |
| 526 | cand->if_outgoing, |
| 527 | router, recv_if)) |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 528 | goto next; |
| 529 | |
| 530 | /* don't use the same router twice */ |
| 531 | if (last_cand_router == cand_router) |
| 532 | goto next; |
| 533 | |
| 534 | /* mark the first possible candidate */ |
| 535 | if (!first_candidate) { |
Sven Eckelmann | 77ae32e | 2016-01-16 10:29:53 +0100 | [diff] [blame] | 536 | kref_get(&cand_router->refcount); |
Sven Eckelmann | a6ba0d3 | 2016-01-16 10:29:52 +0100 | [diff] [blame] | 537 | kref_get(&cand->refcount); |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 538 | first_candidate = cand; |
| 539 | first_candidate_router = cand_router; |
| 540 | } |
| 541 | |
| 542 | /* check if the loop has already passed the previously selected |
| 543 | * candidate ... this function should select the next candidate |
| 544 | * AFTER the previously used bonding candidate. |
| 545 | */ |
| 546 | if (!last_candidate || last_candidate_found) { |
| 547 | next_candidate = cand; |
| 548 | next_candidate_router = cand_router; |
| 549 | break; |
| 550 | } |
| 551 | |
| 552 | if (last_candidate == cand) |
| 553 | last_candidate_found = true; |
| 554 | next: |
| 555 | /* free references */ |
| 556 | if (cand_router) { |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 557 | batadv_neigh_node_put(cand_router); |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 558 | cand_router = NULL; |
| 559 | } |
Sven Eckelmann | 35f9477 | 2016-01-17 11:01:13 +0100 | [diff] [blame] | 560 | batadv_orig_ifinfo_put(cand); |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 561 | } |
| 562 | rcu_read_unlock(); |
| 563 | |
| 564 | /* last_bonding_candidate is reset below, remove the old reference. */ |
| 565 | if (orig_node->last_bonding_candidate) |
Sven Eckelmann | 35f9477 | 2016-01-17 11:01:13 +0100 | [diff] [blame] | 566 | batadv_orig_ifinfo_put(orig_node->last_bonding_candidate); |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 567 | |
| 568 | /* After finding candidates, handle the three cases: |
| 569 | * 1) there is a next candidate, use that |
| 570 | * 2) there is no next candidate, use the first of the list |
| 571 | * 3) there is no candidate at all, return the default router |
| 572 | */ |
| 573 | if (next_candidate) { |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 574 | batadv_neigh_node_put(router); |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 575 | |
| 576 | /* remove references to first candidate, we don't need it. */ |
| 577 | if (first_candidate) { |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 578 | batadv_neigh_node_put(first_candidate_router); |
Sven Eckelmann | 35f9477 | 2016-01-17 11:01:13 +0100 | [diff] [blame] | 579 | batadv_orig_ifinfo_put(first_candidate); |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 580 | } |
| 581 | router = next_candidate_router; |
| 582 | orig_node->last_bonding_candidate = next_candidate; |
| 583 | } else if (first_candidate) { |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 584 | batadv_neigh_node_put(router); |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 585 | |
| 586 | /* refcounting has already been done in the loop above. */ |
| 587 | router = first_candidate_router; |
| 588 | orig_node->last_bonding_candidate = first_candidate; |
| 589 | } else { |
| 590 | orig_node->last_bonding_candidate = NULL; |
| 591 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 592 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 593 | return router; |
| 594 | } |
| 595 | |
Sven Eckelmann | 63b0103 | 2012-05-16 20:23:13 +0200 | [diff] [blame] | 596 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 597 | struct batadv_hard_iface *recv_if) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 598 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 599 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 600 | struct batadv_orig_node *orig_node = NULL; |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 601 | struct batadv_unicast_packet *unicast_packet; |
Antonio Quartulli | 7ed4be9 | 2013-04-08 15:08:18 +0200 | [diff] [blame] | 602 | struct ethhdr *ethhdr = eth_hdr(skb); |
Simon Wunderlich | c54f38c9 | 2013-07-29 17:56:44 +0200 | [diff] [blame] | 603 | int res, hdr_len, ret = NET_RX_DROP; |
Florian Westphal | 63d443e | 2016-05-10 23:17:59 +0200 | [diff] [blame] | 604 | unsigned int len; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 605 | |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 606 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 607 | |
| 608 | /* TTL exceeded */ |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 609 | if (unicast_packet->ttl < 2) { |
Sven Eckelmann | 86ceb36 | 2012-03-07 09:07:45 +0100 | [diff] [blame] | 610 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
| 611 | ethhdr->h_source, unicast_packet->dest); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 612 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 613 | } |
| 614 | |
| 615 | /* get routing information */ |
Sven Eckelmann | da64119 | 2012-05-12 13:48:56 +0200 | [diff] [blame] | 616 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 617 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 618 | if (!orig_node) |
Antonio Quartulli | b5a6f69 | 2011-04-16 11:30:57 +0200 | [diff] [blame] | 619 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 620 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 621 | /* create a copy of the skb, if needed, to modify it. */ |
Antonio Quartulli | 0d12507 | 2012-02-18 11:27:34 +0100 | [diff] [blame] | 622 | if (skb_cow(skb, ETH_HLEN) < 0) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 623 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 624 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 625 | /* decrement ttl */ |
Martin Hundebøll | f097e25 | 2013-05-23 16:53:01 +0200 | [diff] [blame] | 626 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 627 | unicast_packet->ttl--; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 628 | |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 629 | switch (unicast_packet->packet_type) { |
Simon Wunderlich | c54f38c9 | 2013-07-29 17:56:44 +0200 | [diff] [blame] | 630 | case BATADV_UNICAST_4ADDR: |
| 631 | hdr_len = sizeof(struct batadv_unicast_4addr_packet); |
| 632 | break; |
| 633 | case BATADV_UNICAST: |
| 634 | hdr_len = sizeof(struct batadv_unicast_packet); |
| 635 | break; |
| 636 | default: |
| 637 | /* other packet types not supported - yet */ |
| 638 | hdr_len = -1; |
| 639 | break; |
| 640 | } |
| 641 | |
| 642 | if (hdr_len > 0) |
| 643 | batadv_skb_set_priority(skb, hdr_len); |
| 644 | |
Florian Westphal | 63d443e | 2016-05-10 23:17:59 +0200 | [diff] [blame] | 645 | len = skb->len; |
Martin Hundebøll | e91ecfc | 2013-04-20 13:54:39 +0200 | [diff] [blame] | 646 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
Martin Hundebøll | 9533247 | 2013-01-25 11:12:40 +0100 | [diff] [blame] | 647 | |
Martin Hundebøll | e91ecfc | 2013-04-20 13:54:39 +0200 | [diff] [blame] | 648 | /* translate transmit result into receive result */ |
| 649 | if (res == NET_XMIT_SUCCESS) { |
| 650 | /* skb was transmitted and consumed */ |
Martin Hundebøll | 9533247 | 2013-01-25 11:12:40 +0100 | [diff] [blame] | 651 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
| 652 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, |
Florian Westphal | 63d443e | 2016-05-10 23:17:59 +0200 | [diff] [blame] | 653 | len + ETH_HLEN); |
Martin Hundebøll | e91ecfc | 2013-04-20 13:54:39 +0200 | [diff] [blame] | 654 | |
| 655 | ret = NET_RX_SUCCESS; |
| 656 | } else if (res == NET_XMIT_POLICED) { |
| 657 | /* skb was buffered and consumed */ |
| 658 | ret = NET_RX_SUCCESS; |
Martin Hundebøll | 9533247 | 2013-01-25 11:12:40 +0100 | [diff] [blame] | 659 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 660 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 661 | out: |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 662 | if (orig_node) |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 663 | batadv_orig_node_put(orig_node); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 664 | return ret; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 665 | } |
| 666 | |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 667 | /** |
| 668 | * batadv_reroute_unicast_packet - update the unicast header for re-routing |
| 669 | * @bat_priv: the bat priv with all the soft interface information |
| 670 | * @unicast_packet: the unicast header to be updated |
| 671 | * @dst_addr: the payload destination |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 672 | * @vid: VLAN identifier |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 673 | * |
| 674 | * Search the translation table for dst_addr and update the unicast header with |
| 675 | * the new corresponding information (originator address where the destination |
| 676 | * client currently is and its known TTVN) |
| 677 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 678 | * Return: true if the packet header has been updated, false otherwise |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 679 | */ |
| 680 | static bool |
| 681 | batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, |
| 682 | struct batadv_unicast_packet *unicast_packet, |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 683 | u8 *dst_addr, unsigned short vid) |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 684 | { |
| 685 | struct batadv_orig_node *orig_node = NULL; |
| 686 | struct batadv_hard_iface *primary_if = NULL; |
| 687 | bool ret = false; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 688 | u8 *orig_addr, orig_ttvn; |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 689 | |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 690 | if (batadv_is_my_client(bat_priv, dst_addr, vid)) { |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 691 | primary_if = batadv_primary_if_get_selected(bat_priv); |
| 692 | if (!primary_if) |
| 693 | goto out; |
| 694 | orig_addr = primary_if->net_dev->dev_addr; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 695 | orig_ttvn = (u8)atomic_read(&bat_priv->tt.vn); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 696 | } else { |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 697 | orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr, |
| 698 | vid); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 699 | if (!orig_node) |
| 700 | goto out; |
| 701 | |
| 702 | if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) |
| 703 | goto out; |
| 704 | |
| 705 | orig_addr = orig_node->orig; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 706 | orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 707 | } |
| 708 | |
| 709 | /* update the packet header */ |
Antonio Quartulli | 8fdd015 | 2014-01-22 00:42:11 +0100 | [diff] [blame] | 710 | ether_addr_copy(unicast_packet->dest, orig_addr); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 711 | unicast_packet->ttvn = orig_ttvn; |
| 712 | |
| 713 | ret = true; |
| 714 | out: |
| 715 | if (primary_if) |
Sven Eckelmann | 82047ad | 2016-01-17 11:01:10 +0100 | [diff] [blame] | 716 | batadv_hardif_put(primary_if); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 717 | if (orig_node) |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 718 | batadv_orig_node_put(orig_node); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 719 | |
| 720 | return ret; |
| 721 | } |
| 722 | |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 723 | static bool batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
| 724 | struct sk_buff *skb, int hdr_len) |
| 725 | { |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 726 | struct batadv_unicast_packet *unicast_packet; |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 727 | struct batadv_hard_iface *primary_if; |
| 728 | struct batadv_orig_node *orig_node; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 729 | u8 curr_ttvn, old_ttvn; |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 730 | struct ethhdr *ethhdr; |
| 731 | unsigned short vid; |
Sven Eckelmann | 3e34819 | 2012-05-16 20:23:22 +0200 | [diff] [blame] | 732 | int is_old_ttvn; |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 733 | |
Antonio Quartulli | b8fcfa4 | 2012-08-26 23:25:59 +0200 | [diff] [blame] | 734 | /* check if there is enough data before accessing it */ |
Antonio Quartulli | f179142 | 2014-01-30 00:12:24 +0100 | [diff] [blame] | 735 | if (!pskb_may_pull(skb, hdr_len + ETH_HLEN)) |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 736 | return false; |
Antonio Quartulli | b8fcfa4 | 2012-08-26 23:25:59 +0200 | [diff] [blame] | 737 | |
| 738 | /* create a copy of the skb (in case of for re-routing) to modify it. */ |
| 739 | if (skb_cow(skb, sizeof(*unicast_packet)) < 0) |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 740 | return false; |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 741 | |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 742 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 743 | vid = batadv_get_vid(skb, hdr_len); |
Antonio Quartulli | dd981ab | 2013-04-03 10:14:20 +0200 | [diff] [blame] | 744 | ethhdr = (struct ethhdr *)(skb->data + hdr_len); |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 745 | |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 746 | /* check if the destination client was served by this node and it is now |
| 747 | * roaming. In this case, it means that the node has got a ROAM_ADV |
| 748 | * message and that it knows the new destination in the mesh to re-route |
| 749 | * the packet to |
| 750 | */ |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 751 | if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) { |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 752 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 753 | ethhdr->h_dest, vid)) |
André Gaul | 23c4ec1 | 2014-06-10 17:50:31 +0200 | [diff] [blame] | 754 | batadv_dbg_ratelimited(BATADV_DBG_TT, |
| 755 | bat_priv, |
| 756 | "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", |
| 757 | unicast_packet->dest, |
| 758 | ethhdr->h_dest); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 759 | /* at this point the mesh destination should have been |
| 760 | * substituted with the originator address found in the global |
| 761 | * table. If not, let the packet go untouched anyway because |
| 762 | * there is nothing the node can do |
| 763 | */ |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 764 | return true; |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 765 | } |
| 766 | |
| 767 | /* retrieve the TTVN known by this node for the packet destination. This |
| 768 | * value is used later to check if the node which sent (or re-routed |
| 769 | * last time) the packet had an updated information or not |
| 770 | */ |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 771 | curr_ttvn = (u8)atomic_read(&bat_priv->tt.vn); |
Antonio Quartulli | fe8a93b | 2013-04-03 19:10:26 +0200 | [diff] [blame] | 772 | if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
Sven Eckelmann | da64119 | 2012-05-12 13:48:56 +0200 | [diff] [blame] | 773 | orig_node = batadv_orig_hash_find(bat_priv, |
| 774 | unicast_packet->dest); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 775 | /* if it is not possible to find the orig_node representing the |
| 776 | * destination, the packet can immediately be dropped as it will |
| 777 | * not be possible to deliver it |
| 778 | */ |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 779 | if (!orig_node) |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 780 | return false; |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 781 | |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 782 | curr_ttvn = (u8)atomic_read(&orig_node->last_ttvn); |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 783 | batadv_orig_node_put(orig_node); |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 784 | } |
| 785 | |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 786 | /* check if the TTVN contained in the packet is fresher than what the |
| 787 | * node knows |
| 788 | */ |
Sven Eckelmann | 3e34819 | 2012-05-16 20:23:22 +0200 | [diff] [blame] | 789 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 790 | if (!is_old_ttvn) |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 791 | return true; |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 792 | |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 793 | old_ttvn = unicast_packet->ttvn; |
| 794 | /* the packet was forged based on outdated network information. Its |
| 795 | * destination can possibly be updated and forwarded towards the new |
| 796 | * target host |
| 797 | */ |
| 798 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 799 | ethhdr->h_dest, vid)) { |
André Gaul | 23c4ec1 | 2014-06-10 17:50:31 +0200 | [diff] [blame] | 800 | batadv_dbg_ratelimited(BATADV_DBG_TT, bat_priv, |
| 801 | "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", |
| 802 | unicast_packet->dest, ethhdr->h_dest, |
| 803 | old_ttvn, curr_ttvn); |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 804 | return true; |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 805 | } |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 806 | |
| 807 | /* the packet has not been re-routed: either the destination is |
| 808 | * currently served by this node or there is no destination at all and |
| 809 | * it is possible to drop the packet |
| 810 | */ |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 811 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid)) |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 812 | return false; |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 813 | |
| 814 | /* update the header in order to let the packet be delivered to this |
| 815 | * node's soft interface |
| 816 | */ |
| 817 | primary_if = batadv_primary_if_get_selected(bat_priv); |
| 818 | if (!primary_if) |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 819 | return false; |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 820 | |
Antonio Quartulli | 8fdd015 | 2014-01-22 00:42:11 +0100 | [diff] [blame] | 821 | ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 822 | |
Sven Eckelmann | 82047ad | 2016-01-17 11:01:10 +0100 | [diff] [blame] | 823 | batadv_hardif_put(primary_if); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 824 | |
| 825 | unicast_packet->ttvn = curr_ttvn; |
| 826 | |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 827 | return true; |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 828 | } |
| 829 | |
Simon Wunderlich | a1f1ac5 | 2013-04-25 10:37:23 +0200 | [diff] [blame] | 830 | /** |
| 831 | * batadv_recv_unhandled_unicast_packet - receive and process packets which |
| 832 | * are in the unicast number space but not yet known to the implementation |
| 833 | * @skb: unicast tvlv packet to process |
| 834 | * @recv_if: pointer to interface this packet was received on |
| 835 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 836 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP |
Simon Wunderlich | a1f1ac5 | 2013-04-25 10:37:23 +0200 | [diff] [blame] | 837 | * otherwise. |
| 838 | */ |
| 839 | int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, |
| 840 | struct batadv_hard_iface *recv_if) |
| 841 | { |
| 842 | struct batadv_unicast_packet *unicast_packet; |
| 843 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 844 | int check, hdr_size = sizeof(*unicast_packet); |
| 845 | |
| 846 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
| 847 | if (check < 0) |
| 848 | return NET_RX_DROP; |
| 849 | |
| 850 | /* we don't know about this type, drop it. */ |
| 851 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
| 852 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) |
| 853 | return NET_RX_DROP; |
| 854 | |
| 855 | return batadv_route_unicast_packet(skb, recv_if); |
| 856 | } |
| 857 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 858 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
| 859 | struct batadv_hard_iface *recv_if) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 860 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 861 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 862 | struct batadv_unicast_packet *unicast_packet; |
Martin Hundebøll | 4046b24 | 2012-04-20 17:02:45 +0200 | [diff] [blame] | 863 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 864 | u8 *orig_addr; |
Antonio Quartulli | 9affec6 | 2012-10-14 17:19:19 +0200 | [diff] [blame] | 865 | struct batadv_orig_node *orig_node = NULL; |
Martin Hundebøll | 612d2b4 | 2013-01-25 11:12:42 +0100 | [diff] [blame] | 866 | int check, hdr_size = sizeof(*unicast_packet); |
Simon Wunderlich | 437bb0e | 2015-09-02 20:09:54 +0200 | [diff] [blame] | 867 | enum batadv_subtype subtype; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 868 | bool is4addr; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 869 | |
Antonio Quartulli | 7cdcf6d | 2012-10-01 09:57:35 +0200 | [diff] [blame] | 870 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
Martin Hundebøll | 4046b24 | 2012-04-20 17:02:45 +0200 | [diff] [blame] | 871 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
Antonio Quartulli | 7cdcf6d | 2012-10-01 09:57:35 +0200 | [diff] [blame] | 872 | |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 873 | is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR; |
Antonio Quartulli | 7cdcf6d | 2012-10-01 09:57:35 +0200 | [diff] [blame] | 874 | /* the caller function should have already pulled 2 bytes */ |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 875 | if (is4addr) |
Martin Hundebøll | 4046b24 | 2012-04-20 17:02:45 +0200 | [diff] [blame] | 876 | hdr_size = sizeof(*unicast_4addr_packet); |
Antonio Quartulli | 7cdcf6d | 2012-10-01 09:57:35 +0200 | [diff] [blame] | 877 | |
Martin Hundebøll | 612d2b4 | 2013-01-25 11:12:42 +0100 | [diff] [blame] | 878 | /* function returns -EREMOTE for promiscuous packets */ |
David S. Miller | 6e0895c | 2013-04-22 20:32:51 -0400 | [diff] [blame] | 879 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
Martin Hundebøll | 612d2b4 | 2013-01-25 11:12:42 +0100 | [diff] [blame] | 880 | |
| 881 | /* Even though the packet is not for us, we might save it to use for |
| 882 | * decoding a later received coded packet |
| 883 | */ |
| 884 | if (check == -EREMOTE) |
| 885 | batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); |
| 886 | |
| 887 | if (check < 0) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 888 | return NET_RX_DROP; |
Antonio Quartulli | dd981ab | 2013-04-03 10:14:20 +0200 | [diff] [blame] | 889 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 890 | return NET_RX_DROP; |
| 891 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 892 | /* packet for me */ |
Antonio Quartulli | fe8a93b | 2013-04-03 19:10:26 +0200 | [diff] [blame] | 893 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
Antonio Quartulli | 9affec6 | 2012-10-14 17:19:19 +0200 | [diff] [blame] | 894 | if (is4addr) { |
Simon Wunderlich | 437bb0e | 2015-09-02 20:09:54 +0200 | [diff] [blame] | 895 | subtype = unicast_4addr_packet->subtype; |
| 896 | batadv_dat_inc_counter(bat_priv, subtype); |
| 897 | |
| 898 | /* Only payload data should be considered for speedy |
| 899 | * join. For example, DAT also uses unicast 4addr |
| 900 | * types, but those packets should not be considered |
| 901 | * for speedy join, since the clients do not actually |
| 902 | * reside at the sending originator. |
| 903 | */ |
| 904 | if (subtype == BATADV_P_DATA) { |
| 905 | orig_addr = unicast_4addr_packet->src; |
| 906 | orig_node = batadv_orig_hash_find(bat_priv, |
| 907 | orig_addr); |
| 908 | } |
Antonio Quartulli | 9affec6 | 2012-10-14 17:19:19 +0200 | [diff] [blame] | 909 | } |
Martin Hundebøll | 4046b24 | 2012-04-20 17:02:45 +0200 | [diff] [blame] | 910 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 911 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, |
| 912 | hdr_size)) |
| 913 | goto rx_success; |
| 914 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, |
| 915 | hdr_size)) |
| 916 | goto rx_success; |
| 917 | |
Sven Eckelmann | 6535db5 | 2016-02-28 11:38:51 +0100 | [diff] [blame] | 918 | batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, |
Antonio Quartulli | 9affec6 | 2012-10-14 17:19:19 +0200 | [diff] [blame] | 919 | orig_node); |
Antonio Quartulli | 3713517 | 2012-07-05 23:38:30 +0200 | [diff] [blame] | 920 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 921 | rx_success: |
Antonio Quartulli | 9affec6 | 2012-10-14 17:19:19 +0200 | [diff] [blame] | 922 | if (orig_node) |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 923 | batadv_orig_node_put(orig_node); |
Antonio Quartulli | 9affec6 | 2012-10-14 17:19:19 +0200 | [diff] [blame] | 924 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 925 | return NET_RX_SUCCESS; |
| 926 | } |
| 927 | |
Sven Eckelmann | 63b0103 | 2012-05-16 20:23:13 +0200 | [diff] [blame] | 928 | return batadv_route_unicast_packet(skb, recv_if); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 929 | } |
| 930 | |
Marek Lindner | ef26157 | 2013-04-23 21:39:57 +0800 | [diff] [blame] | 931 | /** |
| 932 | * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets |
| 933 | * @skb: unicast tvlv packet to process |
| 934 | * @recv_if: pointer to interface this packet was received on |
Marek Lindner | ef26157 | 2013-04-23 21:39:57 +0800 | [diff] [blame] | 935 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 936 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP |
Marek Lindner | ef26157 | 2013-04-23 21:39:57 +0800 | [diff] [blame] | 937 | * otherwise. |
| 938 | */ |
| 939 | int batadv_recv_unicast_tvlv(struct sk_buff *skb, |
| 940 | struct batadv_hard_iface *recv_if) |
| 941 | { |
| 942 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 943 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; |
| 944 | unsigned char *tvlv_buff; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 945 | u16 tvlv_buff_len; |
Marek Lindner | ef26157 | 2013-04-23 21:39:57 +0800 | [diff] [blame] | 946 | int hdr_size = sizeof(*unicast_tvlv_packet); |
| 947 | int ret = NET_RX_DROP; |
| 948 | |
| 949 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) |
| 950 | return NET_RX_DROP; |
| 951 | |
| 952 | /* the header is likely to be modified while forwarding */ |
| 953 | if (skb_cow(skb, hdr_size) < 0) |
| 954 | return NET_RX_DROP; |
| 955 | |
| 956 | /* packet needs to be linearized to access the tvlv content */ |
| 957 | if (skb_linearize(skb) < 0) |
| 958 | return NET_RX_DROP; |
| 959 | |
| 960 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data; |
| 961 | |
| 962 | tvlv_buff = (unsigned char *)(skb->data + hdr_size); |
| 963 | tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len); |
| 964 | |
| 965 | if (tvlv_buff_len > skb->len - hdr_size) |
| 966 | return NET_RX_DROP; |
| 967 | |
| 968 | ret = batadv_tvlv_containers_process(bat_priv, false, NULL, |
| 969 | unicast_tvlv_packet->src, |
| 970 | unicast_tvlv_packet->dst, |
| 971 | tvlv_buff, tvlv_buff_len); |
| 972 | |
| 973 | if (ret != NET_RX_SUCCESS) |
| 974 | ret = batadv_route_unicast_packet(skb, recv_if); |
Antonio Quartulli | 05c3c8a | 2014-02-11 17:05:07 +0100 | [diff] [blame] | 975 | else |
| 976 | consume_skb(skb); |
Marek Lindner | ef26157 | 2013-04-23 21:39:57 +0800 | [diff] [blame] | 977 | |
| 978 | return ret; |
| 979 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 980 | |
Martin Hundebøll | 610bfc6bc | 2013-05-23 16:53:02 +0200 | [diff] [blame] | 981 | /** |
| 982 | * batadv_recv_frag_packet - process received fragment |
| 983 | * @skb: the received fragment |
| 984 | * @recv_if: interface that the skb is received on |
| 985 | * |
| 986 | * This function does one of the three following things: 1) Forward fragment, if |
| 987 | * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till |
| 988 | * lack further fragments; 3) Merge fragments, if we have all needed parts. |
| 989 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 990 | * Return: NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise. |
Martin Hundebøll | 610bfc6bc | 2013-05-23 16:53:02 +0200 | [diff] [blame] | 991 | */ |
| 992 | int batadv_recv_frag_packet(struct sk_buff *skb, |
| 993 | struct batadv_hard_iface *recv_if) |
| 994 | { |
| 995 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 996 | struct batadv_orig_node *orig_node_src = NULL; |
| 997 | struct batadv_frag_packet *frag_packet; |
| 998 | int ret = NET_RX_DROP; |
| 999 | |
| 1000 | if (batadv_check_unicast_packet(bat_priv, skb, |
| 1001 | sizeof(*frag_packet)) < 0) |
| 1002 | goto out; |
| 1003 | |
| 1004 | frag_packet = (struct batadv_frag_packet *)skb->data; |
| 1005 | orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig); |
| 1006 | if (!orig_node_src) |
| 1007 | goto out; |
| 1008 | |
| 1009 | /* Route the fragment if it is not for us and too big to be merged. */ |
| 1010 | if (!batadv_is_my_mac(bat_priv, frag_packet->dest) && |
| 1011 | batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) { |
| 1012 | ret = NET_RX_SUCCESS; |
| 1013 | goto out; |
| 1014 | } |
| 1015 | |
| 1016 | batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX); |
| 1017 | batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len); |
| 1018 | |
| 1019 | /* Add fragment to buffer and merge if possible. */ |
| 1020 | if (!batadv_frag_skb_buffer(&skb, orig_node_src)) |
| 1021 | goto out; |
| 1022 | |
| 1023 | /* Deliver merged packet to the appropriate handler, if it was |
| 1024 | * merged |
| 1025 | */ |
| 1026 | if (skb) |
| 1027 | batadv_batman_skb_recv(skb, recv_if->net_dev, |
| 1028 | &recv_if->batman_adv_ptype, NULL); |
| 1029 | |
| 1030 | ret = NET_RX_SUCCESS; |
| 1031 | |
| 1032 | out: |
| 1033 | if (orig_node_src) |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 1034 | batadv_orig_node_put(orig_node_src); |
Martin Hundebøll | 610bfc6bc | 2013-05-23 16:53:02 +0200 | [diff] [blame] | 1035 | |
| 1036 | return ret; |
| 1037 | } |
| 1038 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 1039 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
| 1040 | struct batadv_hard_iface *recv_if) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1041 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 1042 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 1043 | struct batadv_orig_node *orig_node = NULL; |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 1044 | struct batadv_bcast_packet *bcast_packet; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1045 | struct ethhdr *ethhdr; |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 1046 | int hdr_size = sizeof(*bcast_packet); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1047 | int ret = NET_RX_DROP; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 1048 | s32 seq_diff; |
| 1049 | u32 seqno; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1050 | |
| 1051 | /* drop packet if it has not necessary minimum size */ |
| 1052 | if (unlikely(!pskb_may_pull(skb, hdr_size))) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1053 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1054 | |
Antonio Quartulli | 7ed4be9 | 2013-04-08 15:08:18 +0200 | [diff] [blame] | 1055 | ethhdr = eth_hdr(skb); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1056 | |
| 1057 | /* packet with broadcast indication but unicast recipient */ |
| 1058 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1059 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1060 | |
| 1061 | /* packet with broadcast sender address */ |
| 1062 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1063 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1064 | |
| 1065 | /* ignore broadcasts sent by myself */ |
Antonio Quartulli | fe8a93b | 2013-04-03 19:10:26 +0200 | [diff] [blame] | 1066 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1067 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1068 | |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 1069 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1070 | |
| 1071 | /* ignore broadcasts originated by myself */ |
Antonio Quartulli | fe8a93b | 2013-04-03 19:10:26 +0200 | [diff] [blame] | 1072 | if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1073 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1074 | |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 1075 | if (bcast_packet->ttl < 2) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1076 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1077 | |
Sven Eckelmann | da64119 | 2012-05-12 13:48:56 +0200 | [diff] [blame] | 1078 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1079 | |
| 1080 | if (!orig_node) |
Antonio Quartulli | b5a6f69 | 2011-04-16 11:30:57 +0200 | [diff] [blame] | 1081 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1082 | |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1083 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1084 | |
Antonio Quartulli | 3fba732 | 2013-10-13 02:50:17 +0200 | [diff] [blame] | 1085 | seqno = ntohl(bcast_packet->seqno); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1086 | /* check whether the packet is a duplicate */ |
Sven Eckelmann | 9b4a115 | 2012-05-12 13:48:53 +0200 | [diff] [blame] | 1087 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
Antonio Quartulli | 3fba732 | 2013-10-13 02:50:17 +0200 | [diff] [blame] | 1088 | seqno)) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1089 | goto spin_unlock; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1090 | |
Antonio Quartulli | 3fba732 | 2013-10-13 02:50:17 +0200 | [diff] [blame] | 1091 | seq_diff = seqno - orig_node->last_bcast_seqno; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1092 | |
| 1093 | /* check whether the packet is old and the host just restarted. */ |
Sven Eckelmann | 30d3c51 | 2012-05-12 02:09:36 +0200 | [diff] [blame] | 1094 | if (batadv_window_protected(bat_priv, seq_diff, |
Simon Wunderlich | 81f0268 | 2015-11-23 19:57:22 +0100 | [diff] [blame] | 1095 | BATADV_BCAST_MAX_AGE, |
| 1096 | &orig_node->bcast_seqno_reset, NULL)) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1097 | goto spin_unlock; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1098 | |
| 1099 | /* mark broadcast in flood history, update window position |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 1100 | * if required. |
| 1101 | */ |
Sven Eckelmann | 0f5f9322 | 2012-05-12 02:09:25 +0200 | [diff] [blame] | 1102 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
Antonio Quartulli | 3fba732 | 2013-10-13 02:50:17 +0200 | [diff] [blame] | 1103 | orig_node->last_bcast_seqno = seqno; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1104 | |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1105 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1106 | |
Simon Wunderlich | fe2da6f | 2012-01-22 20:00:24 +0100 | [diff] [blame] | 1107 | /* check whether this has been sent by another originator before */ |
Simon Wunderlich | 004e86f | 2012-10-18 13:47:42 +0200 | [diff] [blame] | 1108 | if (batadv_bla_check_bcast_duplist(bat_priv, skb)) |
Simon Wunderlich | fe2da6f | 2012-01-22 20:00:24 +0100 | [diff] [blame] | 1109 | goto out; |
| 1110 | |
Simon Wunderlich | c54f38c9 | 2013-07-29 17:56:44 +0200 | [diff] [blame] | 1111 | batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); |
| 1112 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1113 | /* rebroadcast packet */ |
Sven Eckelmann | 9455e34 | 2012-05-12 02:09:37 +0200 | [diff] [blame] | 1114 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1115 | |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1116 | /* don't hand the broadcast up if it is from an originator |
| 1117 | * from the same backbone. |
| 1118 | */ |
Sven Eckelmann | 08adf15 | 2012-05-12 13:38:47 +0200 | [diff] [blame] | 1119 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1120 | goto out; |
| 1121 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1122 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) |
| 1123 | goto rx_success; |
| 1124 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) |
| 1125 | goto rx_success; |
| 1126 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1127 | /* broadcast for me */ |
Sven Eckelmann | 6535db5 | 2016-02-28 11:38:51 +0100 | [diff] [blame] | 1128 | batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, orig_node); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1129 | |
| 1130 | rx_success: |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1131 | ret = NET_RX_SUCCESS; |
| 1132 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1133 | |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1134 | spin_unlock: |
| 1135 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1136 | out: |
| 1137 | if (orig_node) |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 1138 | batadv_orig_node_put(orig_node); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1139 | return ret; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1140 | } |