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" |
Sven Eckelmann | ba41208 | 2016-05-15 23:48:31 +0200 | [diff] [blame] | 43 | #include "log.h" |
Sven Eckelmann | 1e2c2a4 | 2015-04-17 19:40:28 +0200 | [diff] [blame] | 44 | #include "network-coding.h" |
| 45 | #include "originator.h" |
| 46 | #include "packet.h" |
| 47 | #include "send.h" |
| 48 | #include "soft-interface.h" |
| 49 | #include "translation-table.h" |
Markus Pargmann | 1f8dce4 | 2016-05-15 11:07:43 +0200 | [diff] [blame] | 50 | #include "tvlv.h" |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 51 | |
Sven Eckelmann | 63b0103 | 2012-05-16 20:23:13 +0200 | [diff] [blame] | 52 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 53 | struct batadv_hard_iface *recv_if); |
Simon Wunderlich | a7f6ee9 | 2012-01-22 20:00:18 +0100 | [diff] [blame] | 54 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 55 | /** |
| 56 | * _batadv_update_route - set the router for this originator |
| 57 | * @bat_priv: the bat priv with all the soft interface information |
| 58 | * @orig_node: orig node which is to be configured |
| 59 | * @recv_if: the receive interface for which this route is set |
| 60 | * @neigh_node: neighbor which should be the next router |
| 61 | * |
| 62 | * This function does not perform any error checks |
| 63 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 64 | static void _batadv_update_route(struct batadv_priv *bat_priv, |
| 65 | struct batadv_orig_node *orig_node, |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 66 | struct batadv_hard_iface *recv_if, |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 67 | struct batadv_neigh_node *neigh_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 68 | { |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 69 | struct batadv_orig_ifinfo *orig_ifinfo; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 70 | struct batadv_neigh_node *curr_router; |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 71 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 72 | orig_ifinfo = batadv_orig_ifinfo_get(orig_node, recv_if); |
| 73 | if (!orig_ifinfo) |
| 74 | return; |
| 75 | |
| 76 | rcu_read_lock(); |
| 77 | curr_router = rcu_dereference(orig_ifinfo->router); |
Sven Eckelmann | 77ae32e | 2016-01-16 10:29:53 +0100 | [diff] [blame] | 78 | if (curr_router && !kref_get_unless_zero(&curr_router->refcount)) |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 79 | curr_router = NULL; |
| 80 | rcu_read_unlock(); |
Marek Lindner | a8e7f4b | 2010-12-12 21:57:10 +0000 | [diff] [blame] | 81 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 82 | /* route deleted */ |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 83 | if ((curr_router) && (!neigh_node)) { |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 84 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
| 85 | "Deleting route towards: %pM\n", orig_node->orig); |
Antonio Quartulli | 95fb130 | 2013-08-07 18:28:55 +0200 | [diff] [blame] | 86 | batadv_tt_global_del_orig(bat_priv, orig_node, -1, |
Sven Eckelmann | 08c36d3 | 2012-05-12 02:09:39 +0200 | [diff] [blame] | 87 | "Deleted route towards originator"); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 88 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 89 | /* route added */ |
| 90 | } else if ((!curr_router) && (neigh_node)) { |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 91 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 92 | "Adding route towards: %pM (via %pM)\n", |
| 93 | orig_node->orig, neigh_node->addr); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 94 | /* route changed */ |
Sven Eckelmann | bb899b8 | 2011-05-10 11:22:37 +0200 | [diff] [blame] | 95 | } else if (neigh_node && curr_router) { |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 96 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 97 | "Changing route towards: %pM (now via %pM - was via %pM)\n", |
| 98 | orig_node->orig, neigh_node->addr, |
| 99 | curr_router->addr); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 100 | } |
| 101 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 102 | if (curr_router) |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 103 | batadv_neigh_node_put(curr_router); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 104 | |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 105 | spin_lock_bh(&orig_node->neigh_list_lock); |
Sven Eckelmann | d1a65f1 | 2016-03-20 12:27:53 +0100 | [diff] [blame] | 106 | /* curr_router used earlier may not be the current orig_ifinfo->router |
| 107 | * anymore because it was dereferenced outside of the neigh_list_lock |
| 108 | * protected region. After the new best neighbor has replace the current |
| 109 | * best neighbor the reference counter needs to decrease. Consequently, |
| 110 | * the code needs to ensure the curr_router variable contains a pointer |
| 111 | * to the replaced best neighbor. |
| 112 | */ |
| 113 | curr_router = rcu_dereference_protected(orig_ifinfo->router, true); |
| 114 | |
Sven Eckelmann | f0b94eb | 2016-03-05 19:05:24 +0100 | [diff] [blame] | 115 | /* increase refcount of new best neighbor */ |
| 116 | if (neigh_node) |
| 117 | kref_get(&neigh_node->refcount); |
| 118 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 119 | rcu_assign_pointer(orig_ifinfo->router, neigh_node); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 120 | spin_unlock_bh(&orig_node->neigh_list_lock); |
Sven Eckelmann | 35f9477 | 2016-01-17 11:01:13 +0100 | [diff] [blame] | 121 | batadv_orig_ifinfo_put(orig_ifinfo); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 122 | |
| 123 | /* decrease refcount of previous best neighbor */ |
| 124 | if (curr_router) |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 125 | batadv_neigh_node_put(curr_router); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 126 | } |
| 127 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 128 | /** |
| 129 | * batadv_update_route - set the router for this originator |
| 130 | * @bat_priv: the bat priv with all the soft interface information |
| 131 | * @orig_node: orig node which is to be configured |
| 132 | * @recv_if: the receive interface for which this route is set |
| 133 | * @neigh_node: neighbor which should be the next router |
| 134 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 135 | void batadv_update_route(struct batadv_priv *bat_priv, |
| 136 | struct batadv_orig_node *orig_node, |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 137 | struct batadv_hard_iface *recv_if, |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 138 | struct batadv_neigh_node *neigh_node) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 139 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 140 | struct batadv_neigh_node *router = NULL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 141 | |
| 142 | if (!orig_node) |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 143 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 144 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 145 | router = batadv_orig_router_get(orig_node, recv_if); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 146 | |
| 147 | if (router != neigh_node) |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 148 | _batadv_update_route(bat_priv, orig_node, recv_if, neigh_node); |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 149 | |
| 150 | out: |
| 151 | if (router) |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 152 | batadv_neigh_node_put(router); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 153 | } |
| 154 | |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 155 | /** |
Sven Eckelmann | 7afcbbe | 2015-10-31 12:29:29 +0100 | [diff] [blame] | 156 | * batadv_window_protected - checks whether the host restarted and is in the |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 157 | * protection time. |
Sven Eckelmann | 7afcbbe | 2015-10-31 12:29:29 +0100 | [diff] [blame] | 158 | * @bat_priv: the bat priv with all the soft interface information |
| 159 | * @seq_num_diff: difference between the current/received sequence number and |
| 160 | * the last sequence number |
Simon Wunderlich | 81f0268 | 2015-11-23 19:57:22 +0100 | [diff] [blame] | 161 | * @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] | 162 | * @last_reset: jiffies timestamp of the last reset, will be updated when reset |
| 163 | * is detected |
Simon Wunderlich | 81f0268 | 2015-11-23 19:57:22 +0100 | [diff] [blame] | 164 | * @protection_started: is set to true if the protection window was started, |
| 165 | * doesn't change otherwise. |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 166 | * |
| 167 | * Return: |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 168 | * false if the packet is to be accepted. |
| 169 | * true if the packet is to be ignored. |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 170 | */ |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 171 | bool batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff, |
| 172 | s32 seq_old_max_diff, unsigned long *last_reset, |
| 173 | bool *protection_started) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 174 | { |
Simon Wunderlich | 81f0268 | 2015-11-23 19:57:22 +0100 | [diff] [blame] | 175 | if (seq_num_diff <= -seq_old_max_diff || |
Sven Eckelmann | 42d0b04 | 2012-06-03 22:19:17 +0200 | [diff] [blame] | 176 | seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { |
| 177 | if (!batadv_has_timed_out(*last_reset, |
| 178 | BATADV_RESET_PROTECTION_MS)) |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 179 | return true; |
Marek Lindner | 8c7bf24 | 2012-03-17 15:28:33 +0800 | [diff] [blame] | 180 | |
| 181 | *last_reset = jiffies; |
Simon Wunderlich | 81f0268 | 2015-11-23 19:57:22 +0100 | [diff] [blame] | 182 | if (protection_started) |
| 183 | *protection_started = true; |
Sven Eckelmann | 39c75a5 | 2012-06-03 22:19:22 +0200 | [diff] [blame] | 184 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
Sven Eckelmann | 1eda58b | 2012-05-12 13:48:58 +0200 | [diff] [blame] | 185 | "old packet received, start protection\n"); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 186 | } |
Marek Lindner | 8c7bf24 | 2012-03-17 15:28:33 +0800 | [diff] [blame] | 187 | |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 188 | return false; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 189 | } |
| 190 | |
Sven Eckelmann | 30d3c51 | 2012-05-12 02:09:36 +0200 | [diff] [blame] | 191 | bool batadv_check_management_packet(struct sk_buff *skb, |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 192 | struct batadv_hard_iface *hard_iface, |
Sven Eckelmann | 30d3c51 | 2012-05-12 02:09:36 +0200 | [diff] [blame] | 193 | int header_len) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 194 | { |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 195 | struct ethhdr *ethhdr; |
| 196 | |
| 197 | /* drop packet if it has not necessary minimum size */ |
Marek Lindner | c3e2931 | 2012-03-04 16:56:25 +0800 | [diff] [blame] | 198 | if (unlikely(!pskb_may_pull(skb, header_len))) |
| 199 | return false; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 200 | |
Antonio Quartulli | 7ed4be9 | 2013-04-08 15:08:18 +0200 | [diff] [blame] | 201 | ethhdr = eth_hdr(skb); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 202 | |
| 203 | /* packet with broadcast indication but unicast recipient */ |
| 204 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) |
Marek Lindner | c3e2931 | 2012-03-04 16:56:25 +0800 | [diff] [blame] | 205 | return false; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 206 | |
| 207 | /* packet with broadcast sender address */ |
| 208 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
Marek Lindner | c3e2931 | 2012-03-04 16:56:25 +0800 | [diff] [blame] | 209 | return false; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 210 | |
| 211 | /* create a copy of the skb, if needed, to modify it. */ |
| 212 | if (skb_cow(skb, 0) < 0) |
Marek Lindner | c3e2931 | 2012-03-04 16:56:25 +0800 | [diff] [blame] | 213 | return false; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 214 | |
| 215 | /* keep skb linear */ |
| 216 | if (skb_linearize(skb) < 0) |
Marek Lindner | c3e2931 | 2012-03-04 16:56:25 +0800 | [diff] [blame] | 217 | return false; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 218 | |
Marek Lindner | c3e2931 | 2012-03-04 16:56:25 +0800 | [diff] [blame] | 219 | return true; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 220 | } |
| 221 | |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 222 | /** |
| 223 | * batadv_recv_my_icmp_packet - receive an icmp packet locally |
| 224 | * @bat_priv: the bat priv with all the soft interface information |
| 225 | * @skb: icmp packet to process |
| 226 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 227 | * 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] | 228 | * otherwise. |
| 229 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 230 | static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 231 | struct sk_buff *skb) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 232 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 233 | struct batadv_hard_iface *primary_if = NULL; |
| 234 | struct batadv_orig_node *orig_node = NULL; |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 235 | struct batadv_icmp_header *icmph; |
| 236 | int res, ret = NET_RX_DROP; |
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 | icmph = (struct batadv_icmp_header *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 239 | |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 240 | switch (icmph->msg_type) { |
| 241 | case BATADV_ECHO_REPLY: |
| 242 | case BATADV_DESTINATION_UNREACHABLE: |
| 243 | case BATADV_TTL_EXCEEDED: |
| 244 | /* receive the packet */ |
| 245 | if (skb_linearize(skb) < 0) |
| 246 | break; |
| 247 | |
| 248 | batadv_socket_receive_packet(icmph, skb->len); |
| 249 | break; |
| 250 | case BATADV_ECHO_REQUEST: |
| 251 | /* answer echo request (ping) */ |
| 252 | primary_if = batadv_primary_if_get_selected(bat_priv); |
| 253 | if (!primary_if) |
| 254 | goto out; |
| 255 | |
| 256 | /* get routing information */ |
| 257 | orig_node = batadv_orig_hash_find(bat_priv, icmph->orig); |
| 258 | if (!orig_node) |
| 259 | goto out; |
| 260 | |
| 261 | /* create a copy of the skb, if needed, to modify it. */ |
| 262 | if (skb_cow(skb, ETH_HLEN) < 0) |
| 263 | goto out; |
| 264 | |
| 265 | icmph = (struct batadv_icmp_header *)skb->data; |
| 266 | |
Antonio Quartulli | 8fdd015 | 2014-01-22 00:42:11 +0100 | [diff] [blame] | 267 | ether_addr_copy(icmph->dst, icmph->orig); |
| 268 | ether_addr_copy(icmph->orig, primary_if->net_dev->dev_addr); |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 269 | icmph->msg_type = BATADV_ECHO_REPLY; |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 270 | icmph->ttl = BATADV_TTL; |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 271 | |
| 272 | res = batadv_send_skb_to_orig(skb, orig_node, NULL); |
Antonio Quartulli | f50ca95 | 2016-05-18 11:38:48 +0200 | [diff] [blame^] | 273 | if (res == -1) |
| 274 | goto out; |
| 275 | |
| 276 | ret = NET_RX_SUCCESS; |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 277 | |
| 278 | break; |
| 279 | default: |
| 280 | /* drop unknown type */ |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 281 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 282 | } |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 283 | out: |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 284 | if (primary_if) |
Sven Eckelmann | 82047ad | 2016-01-17 11:01:10 +0100 | [diff] [blame] | 285 | batadv_hardif_put(primary_if); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 286 | if (orig_node) |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 287 | batadv_orig_node_put(orig_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 288 | return ret; |
| 289 | } |
| 290 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 291 | static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, |
Sven Eckelmann | 63b0103 | 2012-05-16 20:23:13 +0200 | [diff] [blame] | 292 | struct sk_buff *skb) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 293 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 294 | struct batadv_hard_iface *primary_if = NULL; |
| 295 | struct batadv_orig_node *orig_node = NULL; |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 296 | struct batadv_icmp_packet *icmp_packet; |
Antonio Quartulli | f50ca95 | 2016-05-18 11:38:48 +0200 | [diff] [blame^] | 297 | int res, ret = NET_RX_DROP; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 298 | |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 299 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 300 | |
| 301 | /* send TTL exceeded if packet is an echo request (traceroute) */ |
Antonio Quartulli | 27a417e | 2013-12-05 15:33:00 +0100 | [diff] [blame] | 302 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
Sven Eckelmann | 86ceb36 | 2012-03-07 09:07:45 +0100 | [diff] [blame] | 303 | 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] | 304 | icmp_packet->orig, icmp_packet->dst); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 305 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 306 | } |
| 307 | |
Sven Eckelmann | e5d8925 | 2012-05-12 13:48:54 +0200 | [diff] [blame] | 308 | primary_if = batadv_primary_if_get_selected(bat_priv); |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 309 | if (!primary_if) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 310 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 311 | |
| 312 | /* get routing information */ |
Antonio Quartulli | 27a417e | 2013-12-05 15:33:00 +0100 | [diff] [blame] | 313 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 314 | if (!orig_node) |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 315 | goto out; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 316 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 317 | /* create a copy of the skb, if needed, to modify it. */ |
Antonio Quartulli | 0d12507 | 2012-02-18 11:27:34 +0100 | [diff] [blame] | 318 | if (skb_cow(skb, ETH_HLEN) < 0) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 319 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 320 | |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 321 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 322 | |
Antonio Quartulli | 8fdd015 | 2014-01-22 00:42:11 +0100 | [diff] [blame] | 323 | ether_addr_copy(icmp_packet->dst, icmp_packet->orig); |
| 324 | ether_addr_copy(icmp_packet->orig, primary_if->net_dev->dev_addr); |
Antonio Quartulli | 27a417e | 2013-12-05 15:33:00 +0100 | [diff] [blame] | 325 | icmp_packet->msg_type = BATADV_TTL_EXCEEDED; |
| 326 | icmp_packet->ttl = BATADV_TTL; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 327 | |
Antonio Quartulli | f50ca95 | 2016-05-18 11:38:48 +0200 | [diff] [blame^] | 328 | res = batadv_send_skb_to_orig(skb, orig_node, NULL); |
| 329 | if (res != -1) |
Martin Hundebøll | bb351ba | 2012-10-16 16:13:48 +0200 | [diff] [blame] | 330 | ret = NET_RX_SUCCESS; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 331 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 332 | out: |
Marek Lindner | 32ae9b2 | 2011-04-20 15:40:58 +0200 | [diff] [blame] | 333 | if (primary_if) |
Sven Eckelmann | 82047ad | 2016-01-17 11:01:10 +0100 | [diff] [blame] | 334 | batadv_hardif_put(primary_if); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 335 | if (orig_node) |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 336 | batadv_orig_node_put(orig_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 337 | return ret; |
| 338 | } |
| 339 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 340 | int batadv_recv_icmp_packet(struct sk_buff *skb, |
| 341 | struct batadv_hard_iface *recv_if) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 342 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 343 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 344 | struct batadv_icmp_header *icmph; |
| 345 | struct batadv_icmp_packet_rr *icmp_packet_rr; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 346 | struct ethhdr *ethhdr; |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 347 | struct batadv_orig_node *orig_node = NULL; |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 348 | int hdr_size = sizeof(struct batadv_icmp_header); |
Antonio Quartulli | f50ca95 | 2016-05-18 11:38:48 +0200 | [diff] [blame^] | 349 | int res, ret = NET_RX_DROP; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 350 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 351 | /* drop packet if it has not necessary minimum size */ |
| 352 | if (unlikely(!pskb_may_pull(skb, hdr_size))) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 353 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 354 | |
Antonio Quartulli | 7ed4be9 | 2013-04-08 15:08:18 +0200 | [diff] [blame] | 355 | ethhdr = eth_hdr(skb); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 356 | |
| 357 | /* packet with unicast indication but broadcast recipient */ |
| 358 | if (is_broadcast_ether_addr(ethhdr->h_dest)) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 359 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 360 | |
| 361 | /* packet with broadcast sender address */ |
| 362 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 363 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 364 | |
| 365 | /* not for me */ |
Antonio Quartulli | fe8a93b | 2013-04-03 19:10:26 +0200 | [diff] [blame] | 366 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 367 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 368 | |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 369 | icmph = (struct batadv_icmp_header *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 370 | |
| 371 | /* add record route information if not full */ |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 372 | if ((icmph->msg_type == BATADV_ECHO_REPLY || |
| 373 | icmph->msg_type == BATADV_ECHO_REQUEST) && |
| 374 | (skb->len >= sizeof(struct batadv_icmp_packet_rr))) { |
| 375 | if (skb_linearize(skb) < 0) |
| 376 | goto out; |
| 377 | |
| 378 | /* create a copy of the skb, if needed, to modify it. */ |
| 379 | if (skb_cow(skb, ETH_HLEN) < 0) |
| 380 | goto out; |
| 381 | |
| 382 | icmph = (struct batadv_icmp_header *)skb->data; |
| 383 | icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph; |
| 384 | if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN) |
| 385 | goto out; |
| 386 | |
Antonio Quartulli | 8fdd015 | 2014-01-22 00:42:11 +0100 | [diff] [blame] | 387 | ether_addr_copy(icmp_packet_rr->rr[icmp_packet_rr->rr_cur], |
| 388 | ethhdr->h_dest); |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 389 | icmp_packet_rr->rr_cur++; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 390 | } |
| 391 | |
| 392 | /* packet for me */ |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 393 | if (batadv_is_my_mac(bat_priv, icmph->dst)) |
| 394 | return batadv_recv_my_icmp_packet(bat_priv, skb); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 395 | |
| 396 | /* TTL exceeded */ |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 397 | if (icmph->ttl < 2) |
Sven Eckelmann | 63b0103 | 2012-05-16 20:23:13 +0200 | [diff] [blame] | 398 | return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 399 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 400 | /* get routing information */ |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 401 | orig_node = batadv_orig_hash_find(bat_priv, icmph->dst); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 402 | if (!orig_node) |
Linus Lüssing | e1a5382f | 2011-03-14 22:43:37 +0000 | [diff] [blame] | 403 | goto out; |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 404 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 405 | /* create a copy of the skb, if needed, to modify it. */ |
Antonio Quartulli | 0d12507 | 2012-02-18 11:27:34 +0100 | [diff] [blame] | 406 | if (skb_cow(skb, ETH_HLEN) < 0) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 407 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 408 | |
Simon Wunderlich | da6b8c2 | 2013-10-22 22:50:09 +0200 | [diff] [blame] | 409 | icmph = (struct batadv_icmp_header *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 410 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 411 | /* decrement ttl */ |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 412 | icmph->ttl--; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 413 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 414 | /* route it */ |
Antonio Quartulli | f50ca95 | 2016-05-18 11:38:48 +0200 | [diff] [blame^] | 415 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
| 416 | if (res != -1) |
Martin Hundebøll | bb351ba | 2012-10-16 16:13:48 +0200 | [diff] [blame] | 417 | ret = NET_RX_SUCCESS; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 418 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 419 | out: |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 420 | if (orig_node) |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 421 | batadv_orig_node_put(orig_node); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 422 | return ret; |
| 423 | } |
| 424 | |
Martin Hundebøll | f86ce0a | 2013-01-14 00:20:32 +0100 | [diff] [blame] | 425 | /** |
| 426 | * batadv_check_unicast_packet - Check for malformed unicast packets |
David S. Miller | 6e0895c | 2013-04-22 20:32:51 -0400 | [diff] [blame] | 427 | * @bat_priv: the bat priv with all the soft interface information |
Martin Hundebøll | f86ce0a | 2013-01-14 00:20:32 +0100 | [diff] [blame] | 428 | * @skb: packet to check |
| 429 | * @hdr_size: size of header to pull |
| 430 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 431 | * Check for short header and bad addresses in given packet. |
| 432 | * |
| 433 | * Return: negative value when check fails and 0 otherwise. The negative value |
| 434 | * depends on the reason: -ENODATA for bad header, -EBADR for broadcast |
| 435 | * destination or source, and -EREMOTE for non-local (other host) destination. |
Martin Hundebøll | f86ce0a | 2013-01-14 00:20:32 +0100 | [diff] [blame] | 436 | */ |
Antonio Quartulli | fe8a93b | 2013-04-03 19:10:26 +0200 | [diff] [blame] | 437 | static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, |
| 438 | struct sk_buff *skb, int hdr_size) |
Martin Hundebøll | ff51fd7 | 2012-07-05 11:34:27 +0200 | [diff] [blame] | 439 | { |
| 440 | struct ethhdr *ethhdr; |
| 441 | |
| 442 | /* drop packet if it has not necessary minimum size */ |
| 443 | if (unlikely(!pskb_may_pull(skb, hdr_size))) |
Martin Hundebøll | f86ce0a | 2013-01-14 00:20:32 +0100 | [diff] [blame] | 444 | return -ENODATA; |
Martin Hundebøll | ff51fd7 | 2012-07-05 11:34:27 +0200 | [diff] [blame] | 445 | |
Antonio Quartulli | 7ed4be9 | 2013-04-08 15:08:18 +0200 | [diff] [blame] | 446 | ethhdr = eth_hdr(skb); |
Martin Hundebøll | ff51fd7 | 2012-07-05 11:34:27 +0200 | [diff] [blame] | 447 | |
| 448 | /* packet with unicast indication but broadcast recipient */ |
| 449 | if (is_broadcast_ether_addr(ethhdr->h_dest)) |
Martin Hundebøll | f86ce0a | 2013-01-14 00:20:32 +0100 | [diff] [blame] | 450 | return -EBADR; |
Martin Hundebøll | ff51fd7 | 2012-07-05 11:34:27 +0200 | [diff] [blame] | 451 | |
| 452 | /* packet with broadcast sender address */ |
| 453 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
Martin Hundebøll | f86ce0a | 2013-01-14 00:20:32 +0100 | [diff] [blame] | 454 | return -EBADR; |
Martin Hundebøll | ff51fd7 | 2012-07-05 11:34:27 +0200 | [diff] [blame] | 455 | |
| 456 | /* not for me */ |
Antonio Quartulli | fe8a93b | 2013-04-03 19:10:26 +0200 | [diff] [blame] | 457 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
Martin Hundebøll | f86ce0a | 2013-01-14 00:20:32 +0100 | [diff] [blame] | 458 | return -EREMOTE; |
Martin Hundebøll | ff51fd7 | 2012-07-05 11:34:27 +0200 | [diff] [blame] | 459 | |
| 460 | return 0; |
| 461 | } |
| 462 | |
Simon Wunderlich | f6c8b71 | 2013-11-13 19:14:45 +0100 | [diff] [blame] | 463 | /** |
| 464 | * batadv_find_router - find a suitable router for this originator |
| 465 | * @bat_priv: the bat priv with all the soft interface information |
| 466 | * @orig_node: the destination node |
| 467 | * @recv_if: pointer to interface this packet was received on |
| 468 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 469 | * Return: the router which should be used for this orig_node on |
Simon Wunderlich | f6c8b71 | 2013-11-13 19:14:45 +0100 | [diff] [blame] | 470 | * this interface, or NULL if not available. |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 471 | */ |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 472 | struct batadv_neigh_node * |
| 473 | batadv_find_router(struct batadv_priv *bat_priv, |
| 474 | struct batadv_orig_node *orig_node, |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 475 | struct batadv_hard_iface *recv_if) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 476 | { |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 477 | struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; |
| 478 | struct batadv_neigh_node *first_candidate_router = NULL; |
| 479 | struct batadv_neigh_node *next_candidate_router = NULL; |
| 480 | struct batadv_neigh_node *router, *cand_router = NULL; |
| 481 | struct batadv_neigh_node *last_cand_router = NULL; |
| 482 | struct batadv_orig_ifinfo *cand, *first_candidate = NULL; |
| 483 | struct batadv_orig_ifinfo *next_candidate = NULL; |
| 484 | struct batadv_orig_ifinfo *last_candidate; |
| 485 | bool last_candidate_found = false; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 486 | |
| 487 | if (!orig_node) |
| 488 | return NULL; |
| 489 | |
Simon Wunderlich | 7351a482 | 2013-11-13 19:14:47 +0100 | [diff] [blame] | 490 | router = batadv_orig_router_get(orig_node, recv_if); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 491 | |
Simon Wunderlich | 329887a | 2014-08-13 14:26:56 +0200 | [diff] [blame] | 492 | if (!router) |
| 493 | return router; |
| 494 | |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 495 | /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop) |
| 496 | * and if activated. |
| 497 | */ |
Simon Wunderlich | 329887a | 2014-08-13 14:26:56 +0200 | [diff] [blame] | 498 | if (!(recv_if == BATADV_IF_DEFAULT && atomic_read(&bat_priv->bonding))) |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 499 | return router; |
| 500 | |
| 501 | /* bonding: loop through the list of possible routers found |
| 502 | * for the various outgoing interfaces and find a candidate after |
| 503 | * the last chosen bonding candidate (next_candidate). If no such |
| 504 | * router is found, use the first candidate found (the previously |
| 505 | * chosen bonding candidate might have been the last one in the list). |
Antonio Quartulli | 3f68785 | 2014-11-02 11:29:56 +0100 | [diff] [blame] | 506 | * If this can't be found either, return the previously chosen |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 507 | * router - obviously there are no other candidates. |
| 508 | */ |
| 509 | rcu_read_lock(); |
| 510 | last_candidate = orig_node->last_bonding_candidate; |
| 511 | if (last_candidate) |
| 512 | last_cand_router = rcu_dereference(last_candidate->router); |
| 513 | |
| 514 | hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) { |
| 515 | /* acquire some structures and references ... */ |
Sven Eckelmann | a6ba0d3 | 2016-01-16 10:29:52 +0100 | [diff] [blame] | 516 | if (!kref_get_unless_zero(&cand->refcount)) |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 517 | continue; |
| 518 | |
| 519 | cand_router = rcu_dereference(cand->router); |
| 520 | if (!cand_router) |
| 521 | goto next; |
| 522 | |
Sven Eckelmann | 77ae32e | 2016-01-16 10:29:53 +0100 | [diff] [blame] | 523 | if (!kref_get_unless_zero(&cand_router->refcount)) { |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 524 | cand_router = NULL; |
| 525 | goto next; |
| 526 | } |
| 527 | |
| 528 | /* alternative candidate should be good enough to be |
| 529 | * considered |
| 530 | */ |
Simon Wunderlich | 18165f6 | 2015-08-08 02:01:50 +0200 | [diff] [blame] | 531 | if (!bao->bat_neigh_is_similar_or_better(cand_router, |
| 532 | cand->if_outgoing, |
| 533 | router, recv_if)) |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 534 | goto next; |
| 535 | |
| 536 | /* don't use the same router twice */ |
| 537 | if (last_cand_router == cand_router) |
| 538 | goto next; |
| 539 | |
| 540 | /* mark the first possible candidate */ |
| 541 | if (!first_candidate) { |
Sven Eckelmann | 77ae32e | 2016-01-16 10:29:53 +0100 | [diff] [blame] | 542 | kref_get(&cand_router->refcount); |
Sven Eckelmann | a6ba0d3 | 2016-01-16 10:29:52 +0100 | [diff] [blame] | 543 | kref_get(&cand->refcount); |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 544 | first_candidate = cand; |
| 545 | first_candidate_router = cand_router; |
| 546 | } |
| 547 | |
| 548 | /* check if the loop has already passed the previously selected |
| 549 | * candidate ... this function should select the next candidate |
| 550 | * AFTER the previously used bonding candidate. |
| 551 | */ |
| 552 | if (!last_candidate || last_candidate_found) { |
| 553 | next_candidate = cand; |
| 554 | next_candidate_router = cand_router; |
| 555 | break; |
| 556 | } |
| 557 | |
| 558 | if (last_candidate == cand) |
| 559 | last_candidate_found = true; |
| 560 | next: |
| 561 | /* free references */ |
| 562 | if (cand_router) { |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 563 | batadv_neigh_node_put(cand_router); |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 564 | cand_router = NULL; |
| 565 | } |
Sven Eckelmann | 35f9477 | 2016-01-17 11:01:13 +0100 | [diff] [blame] | 566 | batadv_orig_ifinfo_put(cand); |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 567 | } |
| 568 | rcu_read_unlock(); |
| 569 | |
| 570 | /* last_bonding_candidate is reset below, remove the old reference. */ |
| 571 | if (orig_node->last_bonding_candidate) |
Sven Eckelmann | 35f9477 | 2016-01-17 11:01:13 +0100 | [diff] [blame] | 572 | batadv_orig_ifinfo_put(orig_node->last_bonding_candidate); |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 573 | |
| 574 | /* After finding candidates, handle the three cases: |
| 575 | * 1) there is a next candidate, use that |
| 576 | * 2) there is no next candidate, use the first of the list |
| 577 | * 3) there is no candidate at all, return the default router |
| 578 | */ |
| 579 | if (next_candidate) { |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 580 | batadv_neigh_node_put(router); |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 581 | |
| 582 | /* remove references to first candidate, we don't need it. */ |
| 583 | if (first_candidate) { |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 584 | batadv_neigh_node_put(first_candidate_router); |
Sven Eckelmann | 35f9477 | 2016-01-17 11:01:13 +0100 | [diff] [blame] | 585 | batadv_orig_ifinfo_put(first_candidate); |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 586 | } |
| 587 | router = next_candidate_router; |
| 588 | orig_node->last_bonding_candidate = next_candidate; |
| 589 | } else if (first_candidate) { |
Sven Eckelmann | 25bb250 | 2016-01-17 11:01:11 +0100 | [diff] [blame] | 590 | batadv_neigh_node_put(router); |
Simon Wunderlich | f3b3d90 | 2013-11-13 19:14:50 +0100 | [diff] [blame] | 591 | |
| 592 | /* refcounting has already been done in the loop above. */ |
| 593 | router = first_candidate_router; |
| 594 | orig_node->last_bonding_candidate = first_candidate; |
| 595 | } else { |
| 596 | orig_node->last_bonding_candidate = NULL; |
| 597 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 598 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 599 | return router; |
| 600 | } |
| 601 | |
Sven Eckelmann | 63b0103 | 2012-05-16 20:23:13 +0200 | [diff] [blame] | 602 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 603 | struct batadv_hard_iface *recv_if) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 604 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 605 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 606 | struct batadv_orig_node *orig_node = NULL; |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 607 | struct batadv_unicast_packet *unicast_packet; |
Antonio Quartulli | 7ed4be9 | 2013-04-08 15:08:18 +0200 | [diff] [blame] | 608 | struct ethhdr *ethhdr = eth_hdr(skb); |
Simon Wunderlich | c54f38c | 2013-07-29 17:56:44 +0200 | [diff] [blame] | 609 | int res, hdr_len, ret = NET_RX_DROP; |
Florian Westphal | 63d443e | 2016-05-10 23:17:59 +0200 | [diff] [blame] | 610 | unsigned int len; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 611 | |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 612 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 613 | |
| 614 | /* TTL exceeded */ |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 615 | if (unicast_packet->ttl < 2) { |
Sven Eckelmann | 86ceb36 | 2012-03-07 09:07:45 +0100 | [diff] [blame] | 616 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
| 617 | ethhdr->h_source, unicast_packet->dest); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 618 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 619 | } |
| 620 | |
| 621 | /* get routing information */ |
Sven Eckelmann | da64119 | 2012-05-12 13:48:56 +0200 | [diff] [blame] | 622 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
Marek Lindner | 7aadf88 | 2011-02-18 12:28:09 +0000 | [diff] [blame] | 623 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 624 | if (!orig_node) |
Antonio Quartulli | b5a6f69 | 2011-04-16 11:30:57 +0200 | [diff] [blame] | 625 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 626 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 627 | /* create a copy of the skb, if needed, to modify it. */ |
Antonio Quartulli | 0d12507 | 2012-02-18 11:27:34 +0100 | [diff] [blame] | 628 | if (skb_cow(skb, ETH_HLEN) < 0) |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 629 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 630 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 631 | /* decrement ttl */ |
Martin Hundebøll | f097e25 | 2013-05-23 16:53:01 +0200 | [diff] [blame] | 632 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 633 | unicast_packet->ttl--; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 634 | |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 635 | switch (unicast_packet->packet_type) { |
Simon Wunderlich | c54f38c | 2013-07-29 17:56:44 +0200 | [diff] [blame] | 636 | case BATADV_UNICAST_4ADDR: |
| 637 | hdr_len = sizeof(struct batadv_unicast_4addr_packet); |
| 638 | break; |
| 639 | case BATADV_UNICAST: |
| 640 | hdr_len = sizeof(struct batadv_unicast_packet); |
| 641 | break; |
| 642 | default: |
| 643 | /* other packet types not supported - yet */ |
| 644 | hdr_len = -1; |
| 645 | break; |
| 646 | } |
| 647 | |
| 648 | if (hdr_len > 0) |
| 649 | batadv_skb_set_priority(skb, hdr_len); |
| 650 | |
Florian Westphal | 63d443e | 2016-05-10 23:17:59 +0200 | [diff] [blame] | 651 | len = skb->len; |
Martin Hundebøll | e91ecfc | 2013-04-20 13:54:39 +0200 | [diff] [blame] | 652 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
Antonio Quartulli | f50ca95 | 2016-05-18 11:38:48 +0200 | [diff] [blame^] | 653 | if (res == -1) |
| 654 | goto out; |
Martin Hundebøll | 9533247 | 2013-01-25 11:12:40 +0100 | [diff] [blame] | 655 | |
Martin Hundebøll | e91ecfc | 2013-04-20 13:54:39 +0200 | [diff] [blame] | 656 | /* translate transmit result into receive result */ |
| 657 | if (res == NET_XMIT_SUCCESS) { |
| 658 | /* skb was transmitted and consumed */ |
Martin Hundebøll | 9533247 | 2013-01-25 11:12:40 +0100 | [diff] [blame] | 659 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
| 660 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, |
Florian Westphal | 63d443e | 2016-05-10 23:17:59 +0200 | [diff] [blame] | 661 | len + ETH_HLEN); |
Martin Hundebøll | 9533247 | 2013-01-25 11:12:40 +0100 | [diff] [blame] | 662 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 663 | |
Antonio Quartulli | f50ca95 | 2016-05-18 11:38:48 +0200 | [diff] [blame^] | 664 | ret = NET_RX_SUCCESS; |
| 665 | |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 666 | out: |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 667 | if (orig_node) |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 668 | batadv_orig_node_put(orig_node); |
Marek Lindner | 44524fc | 2011-02-10 14:33:53 +0000 | [diff] [blame] | 669 | return ret; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 670 | } |
| 671 | |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 672 | /** |
| 673 | * batadv_reroute_unicast_packet - update the unicast header for re-routing |
| 674 | * @bat_priv: the bat priv with all the soft interface information |
| 675 | * @unicast_packet: the unicast header to be updated |
| 676 | * @dst_addr: the payload destination |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 677 | * @vid: VLAN identifier |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 678 | * |
| 679 | * Search the translation table for dst_addr and update the unicast header with |
| 680 | * the new corresponding information (originator address where the destination |
| 681 | * client currently is and its known TTVN) |
| 682 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 683 | * Return: true if the packet header has been updated, false otherwise |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 684 | */ |
| 685 | static bool |
| 686 | batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, |
| 687 | struct batadv_unicast_packet *unicast_packet, |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 688 | u8 *dst_addr, unsigned short vid) |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 689 | { |
| 690 | struct batadv_orig_node *orig_node = NULL; |
| 691 | struct batadv_hard_iface *primary_if = NULL; |
| 692 | bool ret = false; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 693 | u8 *orig_addr, orig_ttvn; |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 694 | |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 695 | if (batadv_is_my_client(bat_priv, dst_addr, vid)) { |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 696 | primary_if = batadv_primary_if_get_selected(bat_priv); |
| 697 | if (!primary_if) |
| 698 | goto out; |
| 699 | orig_addr = primary_if->net_dev->dev_addr; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 700 | orig_ttvn = (u8)atomic_read(&bat_priv->tt.vn); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 701 | } else { |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 702 | orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr, |
| 703 | vid); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 704 | if (!orig_node) |
| 705 | goto out; |
| 706 | |
| 707 | if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) |
| 708 | goto out; |
| 709 | |
| 710 | orig_addr = orig_node->orig; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 711 | orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 712 | } |
| 713 | |
| 714 | /* update the packet header */ |
Antonio Quartulli | 8fdd015 | 2014-01-22 00:42:11 +0100 | [diff] [blame] | 715 | ether_addr_copy(unicast_packet->dest, orig_addr); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 716 | unicast_packet->ttvn = orig_ttvn; |
| 717 | |
| 718 | ret = true; |
| 719 | out: |
| 720 | if (primary_if) |
Sven Eckelmann | 82047ad | 2016-01-17 11:01:10 +0100 | [diff] [blame] | 721 | batadv_hardif_put(primary_if); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 722 | if (orig_node) |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 723 | batadv_orig_node_put(orig_node); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 724 | |
| 725 | return ret; |
| 726 | } |
| 727 | |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 728 | static bool batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
| 729 | struct sk_buff *skb, int hdr_len) |
| 730 | { |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 731 | struct batadv_unicast_packet *unicast_packet; |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 732 | struct batadv_hard_iface *primary_if; |
| 733 | struct batadv_orig_node *orig_node; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 734 | u8 curr_ttvn, old_ttvn; |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 735 | struct ethhdr *ethhdr; |
| 736 | unsigned short vid; |
Sven Eckelmann | 3e34819 | 2012-05-16 20:23:22 +0200 | [diff] [blame] | 737 | int is_old_ttvn; |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 738 | |
Antonio Quartulli | b8fcfa4 | 2012-08-26 23:25:59 +0200 | [diff] [blame] | 739 | /* check if there is enough data before accessing it */ |
Antonio Quartulli | f179142 | 2014-01-30 00:12:24 +0100 | [diff] [blame] | 740 | if (!pskb_may_pull(skb, hdr_len + ETH_HLEN)) |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 741 | return false; |
Antonio Quartulli | b8fcfa4 | 2012-08-26 23:25:59 +0200 | [diff] [blame] | 742 | |
| 743 | /* create a copy of the skb (in case of for re-routing) to modify it. */ |
| 744 | if (skb_cow(skb, sizeof(*unicast_packet)) < 0) |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 745 | return false; |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 746 | |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 747 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 748 | vid = batadv_get_vid(skb, hdr_len); |
Antonio Quartulli | dd981ab | 2013-04-03 10:14:20 +0200 | [diff] [blame] | 749 | ethhdr = (struct ethhdr *)(skb->data + hdr_len); |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 750 | |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 751 | /* check if the destination client was served by this node and it is now |
| 752 | * roaming. In this case, it means that the node has got a ROAM_ADV |
| 753 | * message and that it knows the new destination in the mesh to re-route |
| 754 | * the packet to |
| 755 | */ |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 756 | 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] | 757 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 758 | ethhdr->h_dest, vid)) |
André Gaul | 23c4ec1 | 2014-06-10 17:50:31 +0200 | [diff] [blame] | 759 | batadv_dbg_ratelimited(BATADV_DBG_TT, |
| 760 | bat_priv, |
| 761 | "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", |
| 762 | unicast_packet->dest, |
| 763 | ethhdr->h_dest); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 764 | /* at this point the mesh destination should have been |
| 765 | * substituted with the originator address found in the global |
| 766 | * table. If not, let the packet go untouched anyway because |
| 767 | * there is nothing the node can do |
| 768 | */ |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 769 | return true; |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 770 | } |
| 771 | |
| 772 | /* retrieve the TTVN known by this node for the packet destination. This |
| 773 | * value is used later to check if the node which sent (or re-routed |
| 774 | * last time) the packet had an updated information or not |
| 775 | */ |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 776 | curr_ttvn = (u8)atomic_read(&bat_priv->tt.vn); |
Antonio Quartulli | fe8a93b | 2013-04-03 19:10:26 +0200 | [diff] [blame] | 777 | if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
Sven Eckelmann | da64119 | 2012-05-12 13:48:56 +0200 | [diff] [blame] | 778 | orig_node = batadv_orig_hash_find(bat_priv, |
| 779 | unicast_packet->dest); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 780 | /* if it is not possible to find the orig_node representing the |
| 781 | * destination, the packet can immediately be dropped as it will |
| 782 | * not be possible to deliver it |
| 783 | */ |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 784 | if (!orig_node) |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 785 | return false; |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 786 | |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 787 | curr_ttvn = (u8)atomic_read(&orig_node->last_ttvn); |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 788 | batadv_orig_node_put(orig_node); |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 789 | } |
| 790 | |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 791 | /* check if the TTVN contained in the packet is fresher than what the |
| 792 | * node knows |
| 793 | */ |
Sven Eckelmann | 3e34819 | 2012-05-16 20:23:22 +0200 | [diff] [blame] | 794 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 795 | if (!is_old_ttvn) |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 796 | return true; |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 797 | |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 798 | old_ttvn = unicast_packet->ttvn; |
| 799 | /* the packet was forged based on outdated network information. Its |
| 800 | * destination can possibly be updated and forwarded towards the new |
| 801 | * target host |
| 802 | */ |
| 803 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 804 | ethhdr->h_dest, vid)) { |
André Gaul | 23c4ec1 | 2014-06-10 17:50:31 +0200 | [diff] [blame] | 805 | batadv_dbg_ratelimited(BATADV_DBG_TT, bat_priv, |
| 806 | "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", |
| 807 | unicast_packet->dest, ethhdr->h_dest, |
| 808 | old_ttvn, curr_ttvn); |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 809 | return true; |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 810 | } |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 811 | |
| 812 | /* the packet has not been re-routed: either the destination is |
| 813 | * currently served by this node or there is no destination at all and |
| 814 | * it is possible to drop the packet |
| 815 | */ |
Antonio Quartulli | c018ad3 | 2013-06-04 12:11:39 +0200 | [diff] [blame] | 816 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid)) |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 817 | return false; |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 818 | |
| 819 | /* update the header in order to let the packet be delivered to this |
| 820 | * node's soft interface |
| 821 | */ |
| 822 | primary_if = batadv_primary_if_get_selected(bat_priv); |
| 823 | if (!primary_if) |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 824 | return false; |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 825 | |
Antonio Quartulli | 8fdd015 | 2014-01-22 00:42:11 +0100 | [diff] [blame] | 826 | ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 827 | |
Sven Eckelmann | 82047ad | 2016-01-17 11:01:10 +0100 | [diff] [blame] | 828 | batadv_hardif_put(primary_if); |
Antonio Quartulli | 7c1fd91 | 2012-09-23 22:38:34 +0200 | [diff] [blame] | 829 | |
| 830 | unicast_packet->ttvn = curr_ttvn; |
| 831 | |
Sven Eckelmann | 4b426b1 | 2016-02-22 21:02:39 +0100 | [diff] [blame] | 832 | return true; |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 833 | } |
| 834 | |
Simon Wunderlich | a1f1ac5 | 2013-04-25 10:37:23 +0200 | [diff] [blame] | 835 | /** |
| 836 | * batadv_recv_unhandled_unicast_packet - receive and process packets which |
| 837 | * are in the unicast number space but not yet known to the implementation |
| 838 | * @skb: unicast tvlv packet to process |
| 839 | * @recv_if: pointer to interface this packet was received on |
| 840 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 841 | * 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] | 842 | * otherwise. |
| 843 | */ |
| 844 | int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, |
| 845 | struct batadv_hard_iface *recv_if) |
| 846 | { |
| 847 | struct batadv_unicast_packet *unicast_packet; |
| 848 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 849 | int check, hdr_size = sizeof(*unicast_packet); |
| 850 | |
| 851 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
| 852 | if (check < 0) |
| 853 | return NET_RX_DROP; |
| 854 | |
| 855 | /* we don't know about this type, drop it. */ |
| 856 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
| 857 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) |
| 858 | return NET_RX_DROP; |
| 859 | |
| 860 | return batadv_route_unicast_packet(skb, recv_if); |
| 861 | } |
| 862 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 863 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
| 864 | struct batadv_hard_iface *recv_if) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 865 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 866 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 867 | struct batadv_unicast_packet *unicast_packet; |
Martin Hundebøll | 4046b24 | 2012-04-20 17:02:45 +0200 | [diff] [blame] | 868 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 869 | u8 *orig_addr; |
Antonio Quartulli | 9affec6 | 2012-10-14 17:19:19 +0200 | [diff] [blame] | 870 | struct batadv_orig_node *orig_node = NULL; |
Martin Hundebøll | 612d2b4 | 2013-01-25 11:12:42 +0100 | [diff] [blame] | 871 | int check, hdr_size = sizeof(*unicast_packet); |
Simon Wunderlich | 437bb0e | 2015-09-02 20:09:54 +0200 | [diff] [blame] | 872 | enum batadv_subtype subtype; |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 873 | bool is4addr; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 874 | |
Antonio Quartulli | 7cdcf6d | 2012-10-01 09:57:35 +0200 | [diff] [blame] | 875 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
Martin Hundebøll | 4046b24 | 2012-04-20 17:02:45 +0200 | [diff] [blame] | 876 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
Antonio Quartulli | 7cdcf6d | 2012-10-01 09:57:35 +0200 | [diff] [blame] | 877 | |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 878 | is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR; |
Antonio Quartulli | 7cdcf6d | 2012-10-01 09:57:35 +0200 | [diff] [blame] | 879 | /* the caller function should have already pulled 2 bytes */ |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 880 | if (is4addr) |
Martin Hundebøll | 4046b24 | 2012-04-20 17:02:45 +0200 | [diff] [blame] | 881 | hdr_size = sizeof(*unicast_4addr_packet); |
Antonio Quartulli | 7cdcf6d | 2012-10-01 09:57:35 +0200 | [diff] [blame] | 882 | |
Martin Hundebøll | 612d2b4 | 2013-01-25 11:12:42 +0100 | [diff] [blame] | 883 | /* function returns -EREMOTE for promiscuous packets */ |
David S. Miller | 6e0895c | 2013-04-22 20:32:51 -0400 | [diff] [blame] | 884 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
Martin Hundebøll | 612d2b4 | 2013-01-25 11:12:42 +0100 | [diff] [blame] | 885 | |
| 886 | /* Even though the packet is not for us, we might save it to use for |
| 887 | * decoding a later received coded packet |
| 888 | */ |
| 889 | if (check == -EREMOTE) |
| 890 | batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); |
| 891 | |
| 892 | if (check < 0) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 893 | return NET_RX_DROP; |
Antonio Quartulli | dd981ab | 2013-04-03 10:14:20 +0200 | [diff] [blame] | 894 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
Antonio Quartulli | a73105b | 2011-04-27 14:27:44 +0200 | [diff] [blame] | 895 | return NET_RX_DROP; |
| 896 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 897 | /* packet for me */ |
Antonio Quartulli | fe8a93b | 2013-04-03 19:10:26 +0200 | [diff] [blame] | 898 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
Antonio Quartulli | 9affec6 | 2012-10-14 17:19:19 +0200 | [diff] [blame] | 899 | if (is4addr) { |
Simon Wunderlich | 437bb0e | 2015-09-02 20:09:54 +0200 | [diff] [blame] | 900 | subtype = unicast_4addr_packet->subtype; |
| 901 | batadv_dat_inc_counter(bat_priv, subtype); |
| 902 | |
| 903 | /* Only payload data should be considered for speedy |
| 904 | * join. For example, DAT also uses unicast 4addr |
| 905 | * types, but those packets should not be considered |
| 906 | * for speedy join, since the clients do not actually |
| 907 | * reside at the sending originator. |
| 908 | */ |
| 909 | if (subtype == BATADV_P_DATA) { |
| 910 | orig_addr = unicast_4addr_packet->src; |
| 911 | orig_node = batadv_orig_hash_find(bat_priv, |
| 912 | orig_addr); |
| 913 | } |
Antonio Quartulli | 9affec6 | 2012-10-14 17:19:19 +0200 | [diff] [blame] | 914 | } |
Martin Hundebøll | 4046b24 | 2012-04-20 17:02:45 +0200 | [diff] [blame] | 915 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 916 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, |
| 917 | hdr_size)) |
| 918 | goto rx_success; |
| 919 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, |
| 920 | hdr_size)) |
| 921 | goto rx_success; |
| 922 | |
Sven Eckelmann | 6535db5 | 2016-02-28 11:38:51 +0100 | [diff] [blame] | 923 | batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, |
Antonio Quartulli | 9affec6 | 2012-10-14 17:19:19 +0200 | [diff] [blame] | 924 | orig_node); |
Antonio Quartulli | 3713517 | 2012-07-05 23:38:30 +0200 | [diff] [blame] | 925 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 926 | rx_success: |
Antonio Quartulli | 9affec6 | 2012-10-14 17:19:19 +0200 | [diff] [blame] | 927 | if (orig_node) |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 928 | batadv_orig_node_put(orig_node); |
Antonio Quartulli | 9affec6 | 2012-10-14 17:19:19 +0200 | [diff] [blame] | 929 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 930 | return NET_RX_SUCCESS; |
| 931 | } |
| 932 | |
Sven Eckelmann | 63b0103 | 2012-05-16 20:23:13 +0200 | [diff] [blame] | 933 | return batadv_route_unicast_packet(skb, recv_if); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 934 | } |
| 935 | |
Marek Lindner | ef26157 | 2013-04-23 21:39:57 +0800 | [diff] [blame] | 936 | /** |
| 937 | * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets |
| 938 | * @skb: unicast tvlv packet to process |
| 939 | * @recv_if: pointer to interface this packet was received on |
Marek Lindner | ef26157 | 2013-04-23 21:39:57 +0800 | [diff] [blame] | 940 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 941 | * 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] | 942 | * otherwise. |
| 943 | */ |
| 944 | int batadv_recv_unicast_tvlv(struct sk_buff *skb, |
| 945 | struct batadv_hard_iface *recv_if) |
| 946 | { |
| 947 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 948 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; |
| 949 | unsigned char *tvlv_buff; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 950 | u16 tvlv_buff_len; |
Marek Lindner | ef26157 | 2013-04-23 21:39:57 +0800 | [diff] [blame] | 951 | int hdr_size = sizeof(*unicast_tvlv_packet); |
| 952 | int ret = NET_RX_DROP; |
| 953 | |
| 954 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) |
| 955 | return NET_RX_DROP; |
| 956 | |
| 957 | /* the header is likely to be modified while forwarding */ |
| 958 | if (skb_cow(skb, hdr_size) < 0) |
| 959 | return NET_RX_DROP; |
| 960 | |
| 961 | /* packet needs to be linearized to access the tvlv content */ |
| 962 | if (skb_linearize(skb) < 0) |
| 963 | return NET_RX_DROP; |
| 964 | |
| 965 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data; |
| 966 | |
| 967 | tvlv_buff = (unsigned char *)(skb->data + hdr_size); |
| 968 | tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len); |
| 969 | |
| 970 | if (tvlv_buff_len > skb->len - hdr_size) |
| 971 | return NET_RX_DROP; |
| 972 | |
| 973 | ret = batadv_tvlv_containers_process(bat_priv, false, NULL, |
| 974 | unicast_tvlv_packet->src, |
| 975 | unicast_tvlv_packet->dst, |
| 976 | tvlv_buff, tvlv_buff_len); |
| 977 | |
| 978 | if (ret != NET_RX_SUCCESS) |
| 979 | ret = batadv_route_unicast_packet(skb, recv_if); |
Antonio Quartulli | 05c3c8a | 2014-02-11 17:05:07 +0100 | [diff] [blame] | 980 | else |
| 981 | consume_skb(skb); |
Marek Lindner | ef26157 | 2013-04-23 21:39:57 +0800 | [diff] [blame] | 982 | |
| 983 | return ret; |
| 984 | } |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 985 | |
Martin Hundebøll | 610bfc6bc | 2013-05-23 16:53:02 +0200 | [diff] [blame] | 986 | /** |
| 987 | * batadv_recv_frag_packet - process received fragment |
| 988 | * @skb: the received fragment |
| 989 | * @recv_if: interface that the skb is received on |
| 990 | * |
| 991 | * This function does one of the three following things: 1) Forward fragment, if |
| 992 | * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till |
| 993 | * lack further fragments; 3) Merge fragments, if we have all needed parts. |
| 994 | * |
Sven Eckelmann | 62fe710 | 2015-09-15 19:00:48 +0200 | [diff] [blame] | 995 | * 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] | 996 | */ |
| 997 | int batadv_recv_frag_packet(struct sk_buff *skb, |
| 998 | struct batadv_hard_iface *recv_if) |
| 999 | { |
| 1000 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 1001 | struct batadv_orig_node *orig_node_src = NULL; |
| 1002 | struct batadv_frag_packet *frag_packet; |
| 1003 | int ret = NET_RX_DROP; |
| 1004 | |
| 1005 | if (batadv_check_unicast_packet(bat_priv, skb, |
| 1006 | sizeof(*frag_packet)) < 0) |
| 1007 | goto out; |
| 1008 | |
| 1009 | frag_packet = (struct batadv_frag_packet *)skb->data; |
| 1010 | orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig); |
| 1011 | if (!orig_node_src) |
| 1012 | goto out; |
| 1013 | |
Andrew Lunn | c0f25c8 | 2016-05-09 20:03:36 +0200 | [diff] [blame] | 1014 | skb->priority = frag_packet->priority + 256; |
| 1015 | |
Martin Hundebøll | 610bfc6bc | 2013-05-23 16:53:02 +0200 | [diff] [blame] | 1016 | /* Route the fragment if it is not for us and too big to be merged. */ |
| 1017 | if (!batadv_is_my_mac(bat_priv, frag_packet->dest) && |
| 1018 | batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) { |
| 1019 | ret = NET_RX_SUCCESS; |
| 1020 | goto out; |
| 1021 | } |
| 1022 | |
| 1023 | batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX); |
| 1024 | batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len); |
| 1025 | |
| 1026 | /* Add fragment to buffer and merge if possible. */ |
| 1027 | if (!batadv_frag_skb_buffer(&skb, orig_node_src)) |
| 1028 | goto out; |
| 1029 | |
| 1030 | /* Deliver merged packet to the appropriate handler, if it was |
| 1031 | * merged |
| 1032 | */ |
| 1033 | if (skb) |
| 1034 | batadv_batman_skb_recv(skb, recv_if->net_dev, |
| 1035 | &recv_if->batman_adv_ptype, NULL); |
| 1036 | |
| 1037 | ret = NET_RX_SUCCESS; |
| 1038 | |
| 1039 | out: |
| 1040 | if (orig_node_src) |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 1041 | batadv_orig_node_put(orig_node_src); |
Martin Hundebøll | 610bfc6bc | 2013-05-23 16:53:02 +0200 | [diff] [blame] | 1042 | |
| 1043 | return ret; |
| 1044 | } |
| 1045 | |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 1046 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
| 1047 | struct batadv_hard_iface *recv_if) |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1048 | { |
Sven Eckelmann | 56303d3 | 2012-06-05 22:31:31 +0200 | [diff] [blame] | 1049 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
| 1050 | struct batadv_orig_node *orig_node = NULL; |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 1051 | struct batadv_bcast_packet *bcast_packet; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1052 | struct ethhdr *ethhdr; |
Sven Eckelmann | 704509b | 2011-05-14 23:14:54 +0200 | [diff] [blame] | 1053 | int hdr_size = sizeof(*bcast_packet); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1054 | int ret = NET_RX_DROP; |
Sven Eckelmann | 6b5e971 | 2015-05-26 18:34:26 +0200 | [diff] [blame] | 1055 | s32 seq_diff; |
| 1056 | u32 seqno; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1057 | |
| 1058 | /* drop packet if it has not necessary minimum size */ |
| 1059 | if (unlikely(!pskb_may_pull(skb, hdr_size))) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1060 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1061 | |
Antonio Quartulli | 7ed4be9 | 2013-04-08 15:08:18 +0200 | [diff] [blame] | 1062 | ethhdr = eth_hdr(skb); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1063 | |
| 1064 | /* packet with broadcast indication but unicast recipient */ |
| 1065 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1066 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1067 | |
| 1068 | /* packet with broadcast sender address */ |
| 1069 | if (is_broadcast_ether_addr(ethhdr->h_source)) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1070 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1071 | |
| 1072 | /* ignore broadcasts sent by myself */ |
Antonio Quartulli | fe8a93b | 2013-04-03 19:10:26 +0200 | [diff] [blame] | 1073 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1074 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1075 | |
Sven Eckelmann | 9641269 | 2012-06-05 22:31:30 +0200 | [diff] [blame] | 1076 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1077 | |
| 1078 | /* ignore broadcasts originated by myself */ |
Antonio Quartulli | fe8a93b | 2013-04-03 19:10:26 +0200 | [diff] [blame] | 1079 | if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1080 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1081 | |
Simon Wunderlich | a40d9b0 | 2013-12-02 20:38:31 +0100 | [diff] [blame] | 1082 | if (bcast_packet->ttl < 2) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1083 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1084 | |
Sven Eckelmann | da64119 | 2012-05-12 13:48:56 +0200 | [diff] [blame] | 1085 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1086 | |
| 1087 | if (!orig_node) |
Antonio Quartulli | b5a6f69 | 2011-04-16 11:30:57 +0200 | [diff] [blame] | 1088 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1089 | |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1090 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1091 | |
Antonio Quartulli | 3fba732 | 2013-10-13 02:50:17 +0200 | [diff] [blame] | 1092 | seqno = ntohl(bcast_packet->seqno); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1093 | /* check whether the packet is a duplicate */ |
Sven Eckelmann | 9b4a115 | 2012-05-12 13:48:53 +0200 | [diff] [blame] | 1094 | 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] | 1095 | seqno)) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1096 | goto spin_unlock; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1097 | |
Antonio Quartulli | 3fba732 | 2013-10-13 02:50:17 +0200 | [diff] [blame] | 1098 | seq_diff = seqno - orig_node->last_bcast_seqno; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1099 | |
| 1100 | /* check whether the packet is old and the host just restarted. */ |
Sven Eckelmann | 30d3c51 | 2012-05-12 02:09:36 +0200 | [diff] [blame] | 1101 | if (batadv_window_protected(bat_priv, seq_diff, |
Simon Wunderlich | 81f0268 | 2015-11-23 19:57:22 +0100 | [diff] [blame] | 1102 | BATADV_BCAST_MAX_AGE, |
| 1103 | &orig_node->bcast_seqno_reset, NULL)) |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1104 | goto spin_unlock; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1105 | |
| 1106 | /* mark broadcast in flood history, update window position |
Sven Eckelmann | 9cfc7bd | 2012-05-12 02:09:43 +0200 | [diff] [blame] | 1107 | * if required. |
| 1108 | */ |
Sven Eckelmann | 0f5f932 | 2012-05-12 02:09:25 +0200 | [diff] [blame] | 1109 | 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] | 1110 | orig_node->last_bcast_seqno = seqno; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1111 | |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1112 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1113 | |
Simon Wunderlich | fe2da6f | 2012-01-22 20:00:24 +0100 | [diff] [blame] | 1114 | /* check whether this has been sent by another originator before */ |
Simon Wunderlich | 004e86f | 2012-10-18 13:47:42 +0200 | [diff] [blame] | 1115 | if (batadv_bla_check_bcast_duplist(bat_priv, skb)) |
Simon Wunderlich | fe2da6f | 2012-01-22 20:00:24 +0100 | [diff] [blame] | 1116 | goto out; |
| 1117 | |
Simon Wunderlich | c54f38c | 2013-07-29 17:56:44 +0200 | [diff] [blame] | 1118 | batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); |
| 1119 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1120 | /* rebroadcast packet */ |
Sven Eckelmann | 9455e34 | 2012-05-12 02:09:37 +0200 | [diff] [blame] | 1121 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1122 | |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1123 | /* don't hand the broadcast up if it is from an originator |
| 1124 | * from the same backbone. |
| 1125 | */ |
Sven Eckelmann | 08adf15 | 2012-05-12 13:38:47 +0200 | [diff] [blame] | 1126 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
Simon Wunderlich | 2372138 | 2012-01-22 20:00:19 +0100 | [diff] [blame] | 1127 | goto out; |
| 1128 | |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1129 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) |
| 1130 | goto rx_success; |
| 1131 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) |
| 1132 | goto rx_success; |
| 1133 | |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1134 | /* broadcast for me */ |
Sven Eckelmann | 6535db5 | 2016-02-28 11:38:51 +0100 | [diff] [blame] | 1135 | batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, orig_node); |
Antonio Quartulli | c384ea3 | 2011-06-26 03:37:18 +0200 | [diff] [blame] | 1136 | |
| 1137 | rx_success: |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1138 | ret = NET_RX_SUCCESS; |
| 1139 | goto out; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1140 | |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1141 | spin_unlock: |
| 1142 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1143 | out: |
| 1144 | if (orig_node) |
Sven Eckelmann | 5d96731 | 2016-01-17 11:01:09 +0100 | [diff] [blame] | 1145 | batadv_orig_node_put(orig_node); |
Marek Lindner | f3e0008 | 2011-01-25 21:52:11 +0000 | [diff] [blame] | 1146 | return ret; |
Sven Eckelmann | c6c8fea | 2010-12-13 11:19:28 +0000 | [diff] [blame] | 1147 | } |