[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/net/batman-adv/routing.c b/ap/os/linux/linux-3.4.x/net/batman-adv/routing.c
new file mode 100644
index 0000000..8df3a1f
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/batman-adv/routing.c
@@ -0,0 +1,1132 @@
+/*
+ * Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "routing.h"
+#include "send.h"
+#include "soft-interface.h"
+#include "hard-interface.h"
+#include "icmp_socket.h"
+#include "translation-table.h"
+#include "originator.h"
+#include "vis.h"
+#include "unicast.h"
+
+void slide_own_bcast_window(struct hard_iface *hard_iface)
+{
+ struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
+ struct hashtable_t *hash = bat_priv->orig_hash;
+ struct hlist_node *node;
+ struct hlist_head *head;
+ struct orig_node *orig_node;
+ unsigned long *word;
+ uint32_t i;
+ size_t word_index;
+
+ for (i = 0; i < hash->size; i++) {
+ head = &hash->table[i];
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
+ spin_lock_bh(&orig_node->ogm_cnt_lock);
+ word_index = hard_iface->if_num * NUM_WORDS;
+ word = &(orig_node->bcast_own[word_index]);
+
+ bit_get_packet(bat_priv, word, 1, 0);
+ orig_node->bcast_own_sum[hard_iface->if_num] =
+ bit_packet_count(word);
+ spin_unlock_bh(&orig_node->ogm_cnt_lock);
+ }
+ rcu_read_unlock();
+ }
+}
+
+static void _update_route(struct bat_priv *bat_priv,
+ struct orig_node *orig_node,
+ struct neigh_node *neigh_node)
+{
+ struct neigh_node *curr_router;
+
+ curr_router = orig_node_get_router(orig_node);
+
+ /* route deleted */
+ if ((curr_router) && (!neigh_node)) {
+ bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n",
+ orig_node->orig);
+ tt_global_del_orig(bat_priv, orig_node,
+ "Deleted route towards originator");
+
+ /* route added */
+ } else if ((!curr_router) && (neigh_node)) {
+
+ bat_dbg(DBG_ROUTES, bat_priv,
+ "Adding route towards: %pM (via %pM)\n",
+ orig_node->orig, neigh_node->addr);
+ /* route changed */
+ } else if (neigh_node && curr_router) {
+ bat_dbg(DBG_ROUTES, bat_priv,
+ "Changing route towards: %pM (now via %pM - was via %pM)\n",
+ orig_node->orig, neigh_node->addr,
+ curr_router->addr);
+ }
+
+ if (curr_router)
+ neigh_node_free_ref(curr_router);
+
+ /* increase refcount of new best neighbor */
+ if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount))
+ neigh_node = NULL;
+
+ spin_lock_bh(&orig_node->neigh_list_lock);
+ rcu_assign_pointer(orig_node->router, neigh_node);
+ spin_unlock_bh(&orig_node->neigh_list_lock);
+
+ /* decrease refcount of previous best neighbor */
+ if (curr_router)
+ neigh_node_free_ref(curr_router);
+}
+
+void update_route(struct bat_priv *bat_priv, struct orig_node *orig_node,
+ struct neigh_node *neigh_node)
+{
+ struct neigh_node *router = NULL;
+
+ if (!orig_node)
+ goto out;
+
+ router = orig_node_get_router(orig_node);
+
+ if (router != neigh_node)
+ _update_route(bat_priv, orig_node, neigh_node);
+
+out:
+ if (router)
+ neigh_node_free_ref(router);
+}
+
+/* caller must hold the neigh_list_lock */
+void bonding_candidate_del(struct orig_node *orig_node,
+ struct neigh_node *neigh_node)
+{
+ /* this neighbor is not part of our candidate list */
+ if (list_empty(&neigh_node->bonding_list))
+ goto out;
+
+ list_del_rcu(&neigh_node->bonding_list);
+ INIT_LIST_HEAD(&neigh_node->bonding_list);
+ neigh_node_free_ref(neigh_node);
+ atomic_dec(&orig_node->bond_candidates);
+
+out:
+ return;
+}
+
+void bonding_candidate_add(struct orig_node *orig_node,
+ struct neigh_node *neigh_node)
+{
+ struct hlist_node *node;
+ struct neigh_node *tmp_neigh_node, *router = NULL;
+ uint8_t interference_candidate = 0;
+
+ spin_lock_bh(&orig_node->neigh_list_lock);
+
+ /* only consider if it has the same primary address ... */
+ if (!compare_eth(orig_node->orig,
+ neigh_node->orig_node->primary_addr))
+ goto candidate_del;
+
+ router = orig_node_get_router(orig_node);
+ if (!router)
+ goto candidate_del;
+
+ /* ... and is good enough to be considered */
+ if (neigh_node->tq_avg < router->tq_avg - BONDING_TQ_THRESHOLD)
+ goto candidate_del;
+
+ /**
+ * check if we have another candidate with the same mac address or
+ * interface. If we do, we won't select this candidate because of
+ * possible interference.
+ */
+ hlist_for_each_entry_rcu(tmp_neigh_node, node,
+ &orig_node->neigh_list, list) {
+
+ if (tmp_neigh_node == neigh_node)
+ continue;
+
+ /* we only care if the other candidate is even
+ * considered as candidate. */
+ if (list_empty(&tmp_neigh_node->bonding_list))
+ continue;
+
+ if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) ||
+ (compare_eth(neigh_node->addr, tmp_neigh_node->addr))) {
+ interference_candidate = 1;
+ break;
+ }
+ }
+
+ /* don't care further if it is an interference candidate */
+ if (interference_candidate)
+ goto candidate_del;
+
+ /* this neighbor already is part of our candidate list */
+ if (!list_empty(&neigh_node->bonding_list))
+ goto out;
+
+ if (!atomic_inc_not_zero(&neigh_node->refcount))
+ goto out;
+
+ list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list);
+ atomic_inc(&orig_node->bond_candidates);
+ goto out;
+
+candidate_del:
+ bonding_candidate_del(orig_node, neigh_node);
+
+out:
+ spin_unlock_bh(&orig_node->neigh_list_lock);
+
+ if (router)
+ neigh_node_free_ref(router);
+}
+
+/* copy primary address for bonding */
+void bonding_save_primary(const struct orig_node *orig_node,
+ struct orig_node *orig_neigh_node,
+ const struct batman_ogm_packet *batman_ogm_packet)
+{
+ if (!(batman_ogm_packet->flags & PRIMARIES_FIRST_HOP))
+ return;
+
+ memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN);
+}
+
+/* checks whether the host restarted and is in the protection time.
+ * returns:
+ * 0 if the packet is to be accepted
+ * 1 if the packet is to be ignored.
+ */
+int window_protected(struct bat_priv *bat_priv, int32_t seq_num_diff,
+ unsigned long *last_reset)
+{
+ if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE) ||
+ (seq_num_diff >= EXPECTED_SEQNO_RANGE)) {
+ if (has_timed_out(*last_reset, RESET_PROTECTION_MS)) {
+
+ *last_reset = jiffies;
+ bat_dbg(DBG_BATMAN, bat_priv,
+ "old packet received, start protection\n");
+
+ return 0;
+ } else {
+ return 1;
+ }
+ }
+ return 0;
+}
+
+int recv_bat_ogm_packet(struct sk_buff *skb, struct hard_iface *hard_iface)
+{
+ struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
+ struct ethhdr *ethhdr;
+
+ /* drop packet if it has not necessary minimum size */
+ if (unlikely(!pskb_may_pull(skb, BATMAN_OGM_LEN)))
+ return NET_RX_DROP;
+
+ ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+ /* packet with broadcast indication but unicast recipient */
+ if (!is_broadcast_ether_addr(ethhdr->h_dest))
+ return NET_RX_DROP;
+
+ /* packet with broadcast sender address */
+ if (is_broadcast_ether_addr(ethhdr->h_source))
+ return NET_RX_DROP;
+
+ /* create a copy of the skb, if needed, to modify it. */
+ if (skb_cow(skb, 0) < 0)
+ return NET_RX_DROP;
+
+ /* keep skb linear */
+ if (skb_linearize(skb) < 0)
+ return NET_RX_DROP;
+
+ bat_priv->bat_algo_ops->bat_ogm_receive(hard_iface, skb);
+
+ kfree_skb(skb);
+ return NET_RX_SUCCESS;
+}
+
+static int recv_my_icmp_packet(struct bat_priv *bat_priv,
+ struct sk_buff *skb, size_t icmp_len)
+{
+ struct hard_iface *primary_if = NULL;
+ struct orig_node *orig_node = NULL;
+ struct neigh_node *router = NULL;
+ struct icmp_packet_rr *icmp_packet;
+ int ret = NET_RX_DROP;
+
+ icmp_packet = (struct icmp_packet_rr *)skb->data;
+
+ /* add data to device queue */
+ if (icmp_packet->msg_type != ECHO_REQUEST) {
+ bat_socket_receive_packet(icmp_packet, icmp_len);
+ goto out;
+ }
+
+ primary_if = primary_if_get_selected(bat_priv);
+ if (!primary_if)
+ goto out;
+
+ /* answer echo request (ping) */
+ /* get routing information */
+ orig_node = orig_hash_find(bat_priv, icmp_packet->orig);
+ if (!orig_node)
+ goto out;
+
+ router = orig_node_get_router(orig_node);
+ if (!router)
+ goto out;
+
+ /* create a copy of the skb, if needed, to modify it. */
+ if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
+ goto out;
+
+ icmp_packet = (struct icmp_packet_rr *)skb->data;
+
+ memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
+ memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
+ icmp_packet->msg_type = ECHO_REPLY;
+ icmp_packet->header.ttl = TTL;
+
+ send_skb_packet(skb, router->if_incoming, router->addr);
+ ret = NET_RX_SUCCESS;
+
+out:
+ if (primary_if)
+ hardif_free_ref(primary_if);
+ if (router)
+ neigh_node_free_ref(router);
+ if (orig_node)
+ orig_node_free_ref(orig_node);
+ return ret;
+}
+
+static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
+ struct sk_buff *skb)
+{
+ struct hard_iface *primary_if = NULL;
+ struct orig_node *orig_node = NULL;
+ struct neigh_node *router = NULL;
+ struct icmp_packet *icmp_packet;
+ int ret = NET_RX_DROP;
+
+ icmp_packet = (struct icmp_packet *)skb->data;
+
+ /* send TTL exceeded if packet is an echo request (traceroute) */
+ if (icmp_packet->msg_type != ECHO_REQUEST) {
+ pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n",
+ icmp_packet->orig, icmp_packet->dst);
+ goto out;
+ }
+
+ primary_if = primary_if_get_selected(bat_priv);
+ if (!primary_if)
+ goto out;
+
+ /* get routing information */
+ orig_node = orig_hash_find(bat_priv, icmp_packet->orig);
+ if (!orig_node)
+ goto out;
+
+ router = orig_node_get_router(orig_node);
+ if (!router)
+ goto out;
+
+ /* create a copy of the skb, if needed, to modify it. */
+ if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
+ goto out;
+
+ icmp_packet = (struct icmp_packet *)skb->data;
+
+ memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
+ memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
+ icmp_packet->msg_type = TTL_EXCEEDED;
+ icmp_packet->header.ttl = TTL;
+
+ send_skb_packet(skb, router->if_incoming, router->addr);
+ ret = NET_RX_SUCCESS;
+
+out:
+ if (primary_if)
+ hardif_free_ref(primary_if);
+ if (router)
+ neigh_node_free_ref(router);
+ if (orig_node)
+ orig_node_free_ref(orig_node);
+ return ret;
+}
+
+
+int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if)
+{
+ struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+ struct icmp_packet_rr *icmp_packet;
+ struct ethhdr *ethhdr;
+ struct orig_node *orig_node = NULL;
+ struct neigh_node *router = NULL;
+ int hdr_size = sizeof(struct icmp_packet);
+ int ret = NET_RX_DROP;
+
+ /**
+ * we truncate all incoming icmp packets if they don't match our size
+ */
+ if (skb->len >= sizeof(struct icmp_packet_rr))
+ hdr_size = sizeof(struct icmp_packet_rr);
+
+ /* drop packet if it has not necessary minimum size */
+ if (unlikely(!pskb_may_pull(skb, hdr_size)))
+ goto out;
+
+ ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+ /* packet with unicast indication but broadcast recipient */
+ if (is_broadcast_ether_addr(ethhdr->h_dest))
+ goto out;
+
+ /* packet with broadcast sender address */
+ if (is_broadcast_ether_addr(ethhdr->h_source))
+ goto out;
+
+ /* not for me */
+ if (!is_my_mac(ethhdr->h_dest))
+ goto out;
+
+ icmp_packet = (struct icmp_packet_rr *)skb->data;
+
+ /* add record route information if not full */
+ if ((hdr_size == sizeof(struct icmp_packet_rr)) &&
+ (icmp_packet->rr_cur < BAT_RR_LEN)) {
+ memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
+ ethhdr->h_dest, ETH_ALEN);
+ icmp_packet->rr_cur++;
+ }
+
+ /* packet for me */
+ if (is_my_mac(icmp_packet->dst))
+ return recv_my_icmp_packet(bat_priv, skb, hdr_size);
+
+ /* TTL exceeded */
+ if (icmp_packet->header.ttl < 2)
+ return recv_icmp_ttl_exceeded(bat_priv, skb);
+
+ /* get routing information */
+ orig_node = orig_hash_find(bat_priv, icmp_packet->dst);
+ if (!orig_node)
+ goto out;
+
+ router = orig_node_get_router(orig_node);
+ if (!router)
+ goto out;
+
+ /* create a copy of the skb, if needed, to modify it. */
+ if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
+ goto out;
+
+ icmp_packet = (struct icmp_packet_rr *)skb->data;
+
+ /* decrement ttl */
+ icmp_packet->header.ttl--;
+
+ /* route it */
+ send_skb_packet(skb, router->if_incoming, router->addr);
+ ret = NET_RX_SUCCESS;
+
+out:
+ if (router)
+ neigh_node_free_ref(router);
+ if (orig_node)
+ orig_node_free_ref(orig_node);
+ return ret;
+}
+
+/* In the bonding case, send the packets in a round
+ * robin fashion over the remaining interfaces.
+ *
+ * This method rotates the bonding list and increases the
+ * returned router's refcount. */
+static struct neigh_node *find_bond_router(struct orig_node *primary_orig,
+ const struct hard_iface *recv_if)
+{
+ struct neigh_node *tmp_neigh_node;
+ struct neigh_node *router = NULL, *first_candidate = NULL;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
+ bonding_list) {
+ if (!first_candidate)
+ first_candidate = tmp_neigh_node;
+
+ /* recv_if == NULL on the first node. */
+ if (tmp_neigh_node->if_incoming == recv_if)
+ continue;
+
+ if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
+ continue;
+
+ router = tmp_neigh_node;
+ break;
+ }
+
+ /* use the first candidate if nothing was found. */
+ if (!router && first_candidate &&
+ atomic_inc_not_zero(&first_candidate->refcount))
+ router = first_candidate;
+
+ if (!router)
+ goto out;
+
+ /* selected should point to the next element
+ * after the current router */
+ spin_lock_bh(&primary_orig->neigh_list_lock);
+ /* this is a list_move(), which unfortunately
+ * does not exist as rcu version */
+ list_del_rcu(&primary_orig->bond_list);
+ list_add_rcu(&primary_orig->bond_list,
+ &router->bonding_list);
+ spin_unlock_bh(&primary_orig->neigh_list_lock);
+
+out:
+ rcu_read_unlock();
+ return router;
+}
+
+/* Interface Alternating: Use the best of the
+ * remaining candidates which are not using
+ * this interface.
+ *
+ * Increases the returned router's refcount */
+static struct neigh_node *find_ifalter_router(struct orig_node *primary_orig,
+ const struct hard_iface *recv_if)
+{
+ struct neigh_node *tmp_neigh_node;
+ struct neigh_node *router = NULL, *first_candidate = NULL;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
+ bonding_list) {
+ if (!first_candidate)
+ first_candidate = tmp_neigh_node;
+
+ /* recv_if == NULL on the first node. */
+ if (tmp_neigh_node->if_incoming == recv_if)
+ continue;
+
+ if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
+ continue;
+
+ /* if we don't have a router yet
+ * or this one is better, choose it. */
+ if ((!router) ||
+ (tmp_neigh_node->tq_avg > router->tq_avg)) {
+ /* decrement refcount of
+ * previously selected router */
+ if (router)
+ neigh_node_free_ref(router);
+
+ router = tmp_neigh_node;
+ atomic_inc_not_zero(&router->refcount);
+ }
+
+ neigh_node_free_ref(tmp_neigh_node);
+ }
+
+ /* use the first candidate if nothing was found. */
+ if (!router && first_candidate &&
+ atomic_inc_not_zero(&first_candidate->refcount))
+ router = first_candidate;
+
+ rcu_read_unlock();
+ return router;
+}
+
+int recv_tt_query(struct sk_buff *skb, struct hard_iface *recv_if)
+{
+ struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+ struct tt_query_packet *tt_query;
+ uint16_t tt_len;
+ struct ethhdr *ethhdr;
+
+ /* drop packet if it has not necessary minimum size */
+ if (unlikely(!pskb_may_pull(skb, sizeof(struct tt_query_packet))))
+ goto out;
+
+ /* I could need to modify it */
+ if (skb_cow(skb, sizeof(struct tt_query_packet)) < 0)
+ goto out;
+
+ ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+ /* packet with unicast indication but broadcast recipient */
+ if (is_broadcast_ether_addr(ethhdr->h_dest))
+ goto out;
+
+ /* packet with broadcast sender address */
+ if (is_broadcast_ether_addr(ethhdr->h_source))
+ goto out;
+
+ tt_query = (struct tt_query_packet *)skb->data;
+
+ tt_query->tt_data = ntohs(tt_query->tt_data);
+
+ switch (tt_query->flags & TT_QUERY_TYPE_MASK) {
+ case TT_REQUEST:
+ /* If we cannot provide an answer the tt_request is
+ * forwarded */
+ if (!send_tt_response(bat_priv, tt_query)) {
+ bat_dbg(DBG_TT, bat_priv,
+ "Routing TT_REQUEST to %pM [%c]\n",
+ tt_query->dst,
+ (tt_query->flags & TT_FULL_TABLE ? 'F' : '.'));
+ tt_query->tt_data = htons(tt_query->tt_data);
+ return route_unicast_packet(skb, recv_if);
+ }
+ break;
+ case TT_RESPONSE:
+ if (is_my_mac(tt_query->dst)) {
+ /* packet needs to be linearized to access the TT
+ * changes */
+ if (skb_linearize(skb) < 0)
+ goto out;
+ /* skb_linearize() possibly changed skb->data */
+ tt_query = (struct tt_query_packet *)skb->data;
+
+ tt_len = tt_query->tt_data * sizeof(struct tt_change);
+
+ /* Ensure we have all the claimed data */
+ if (unlikely(skb_headlen(skb) <
+ sizeof(struct tt_query_packet) + tt_len))
+ goto out;
+
+ handle_tt_response(bat_priv, tt_query);
+ } else {
+ bat_dbg(DBG_TT, bat_priv,
+ "Routing TT_RESPONSE to %pM [%c]\n",
+ tt_query->dst,
+ (tt_query->flags & TT_FULL_TABLE ? 'F' : '.'));
+ tt_query->tt_data = htons(tt_query->tt_data);
+ return route_unicast_packet(skb, recv_if);
+ }
+ break;
+ }
+
+out:
+ /* returning NET_RX_DROP will make the caller function kfree the skb */
+ return NET_RX_DROP;
+}
+
+int recv_roam_adv(struct sk_buff *skb, struct hard_iface *recv_if)
+{
+ struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+ struct roam_adv_packet *roam_adv_packet;
+ struct orig_node *orig_node;
+ struct ethhdr *ethhdr;
+
+ /* drop packet if it has not necessary minimum size */
+ if (unlikely(!pskb_may_pull(skb, sizeof(struct roam_adv_packet))))
+ goto out;
+
+ ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+ /* packet with unicast indication but broadcast recipient */
+ if (is_broadcast_ether_addr(ethhdr->h_dest))
+ goto out;
+
+ /* packet with broadcast sender address */
+ if (is_broadcast_ether_addr(ethhdr->h_source))
+ goto out;
+
+ roam_adv_packet = (struct roam_adv_packet *)skb->data;
+
+ if (!is_my_mac(roam_adv_packet->dst))
+ return route_unicast_packet(skb, recv_if);
+
+ orig_node = orig_hash_find(bat_priv, roam_adv_packet->src);
+ if (!orig_node)
+ goto out;
+
+ bat_dbg(DBG_TT, bat_priv,
+ "Received ROAMING_ADV from %pM (client %pM)\n",
+ roam_adv_packet->src, roam_adv_packet->client);
+
+ tt_global_add(bat_priv, orig_node, roam_adv_packet->client,
+ atomic_read(&orig_node->last_ttvn) + 1, true, false);
+
+ /* Roaming phase starts: I have new information but the ttvn has not
+ * been incremented yet. This flag will make me check all the incoming
+ * packets for the correct destination. */
+ bat_priv->tt_poss_change = true;
+
+ orig_node_free_ref(orig_node);
+out:
+ /* returning NET_RX_DROP will make the caller function kfree the skb */
+ return NET_RX_DROP;
+}
+
+/* find a suitable router for this originator, and use
+ * bonding if possible. increases the found neighbors
+ * refcount.*/
+struct neigh_node *find_router(struct bat_priv *bat_priv,
+ struct orig_node *orig_node,
+ const struct hard_iface *recv_if)
+{
+ struct orig_node *primary_orig_node;
+ struct orig_node *router_orig;
+ struct neigh_node *router;
+ static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
+ int bonding_enabled;
+
+ if (!orig_node)
+ return NULL;
+
+ router = orig_node_get_router(orig_node);
+ if (!router)
+ goto err;
+
+ /* without bonding, the first node should
+ * always choose the default router. */
+ bonding_enabled = atomic_read(&bat_priv->bonding);
+
+ rcu_read_lock();
+ /* select default router to output */
+ router_orig = router->orig_node;
+ if (!router_orig)
+ goto err_unlock;
+
+ if ((!recv_if) && (!bonding_enabled))
+ goto return_router;
+
+ /* if we have something in the primary_addr, we can search
+ * for a potential bonding candidate. */
+ if (compare_eth(router_orig->primary_addr, zero_mac))
+ goto return_router;
+
+ /* find the orig_node which has the primary interface. might
+ * even be the same as our router_orig in many cases */
+
+ if (compare_eth(router_orig->primary_addr, router_orig->orig)) {
+ primary_orig_node = router_orig;
+ } else {
+ primary_orig_node = orig_hash_find(bat_priv,
+ router_orig->primary_addr);
+ if (!primary_orig_node)
+ goto return_router;
+
+ orig_node_free_ref(primary_orig_node);
+ }
+
+ /* with less than 2 candidates, we can't do any
+ * bonding and prefer the original router. */
+ if (atomic_read(&primary_orig_node->bond_candidates) < 2)
+ goto return_router;
+
+ /* all nodes between should choose a candidate which
+ * is is not on the interface where the packet came
+ * in. */
+
+ neigh_node_free_ref(router);
+
+ if (bonding_enabled)
+ router = find_bond_router(primary_orig_node, recv_if);
+ else
+ router = find_ifalter_router(primary_orig_node, recv_if);
+
+return_router:
+ if (router && router->if_incoming->if_status != IF_ACTIVE)
+ goto err_unlock;
+
+ rcu_read_unlock();
+ return router;
+err_unlock:
+ rcu_read_unlock();
+err:
+ if (router)
+ neigh_node_free_ref(router);
+ return NULL;
+}
+
+static int check_unicast_packet(struct sk_buff *skb, int hdr_size)
+{
+ struct ethhdr *ethhdr;
+
+ /* drop packet if it has not necessary minimum size */
+ if (unlikely(!pskb_may_pull(skb, hdr_size)))
+ return -1;
+
+ ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+ /* packet with unicast indication but broadcast recipient */
+ if (is_broadcast_ether_addr(ethhdr->h_dest))
+ return -1;
+
+ /* packet with broadcast sender address */
+ if (is_broadcast_ether_addr(ethhdr->h_source))
+ return -1;
+
+ /* not for me */
+ if (!is_my_mac(ethhdr->h_dest))
+ return -1;
+
+ return 0;
+}
+
+int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
+{
+ struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+ struct orig_node *orig_node = NULL;
+ struct neigh_node *neigh_node = NULL;
+ struct unicast_packet *unicast_packet;
+ struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
+ int ret = NET_RX_DROP;
+ struct sk_buff *new_skb;
+
+ unicast_packet = (struct unicast_packet *)skb->data;
+
+ /* TTL exceeded */
+ if (unicast_packet->header.ttl < 2) {
+ pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n",
+ ethhdr->h_source, unicast_packet->dest);
+ goto out;
+ }
+
+ /* get routing information */
+ orig_node = orig_hash_find(bat_priv, unicast_packet->dest);
+
+ if (!orig_node)
+ goto out;
+
+ /* find_router() increases neigh_nodes refcount if found. */
+ neigh_node = find_router(bat_priv, orig_node, recv_if);
+
+ if (!neigh_node)
+ goto out;
+
+ /* create a copy of the skb, if needed, to modify it. */
+ if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
+ goto out;
+
+ unicast_packet = (struct unicast_packet *)skb->data;
+
+ if (unicast_packet->header.packet_type == BAT_UNICAST &&
+ atomic_read(&bat_priv->fragmentation) &&
+ skb->len > neigh_node->if_incoming->net_dev->mtu) {
+ ret = frag_send_skb(skb, bat_priv,
+ neigh_node->if_incoming, neigh_node->addr);
+ goto out;
+ }
+
+ if (unicast_packet->header.packet_type == BAT_UNICAST_FRAG &&
+ frag_can_reassemble(skb, neigh_node->if_incoming->net_dev->mtu)) {
+
+ ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
+
+ if (ret == NET_RX_DROP)
+ goto out;
+
+ /* packet was buffered for late merge */
+ if (!new_skb) {
+ ret = NET_RX_SUCCESS;
+ goto out;
+ }
+
+ skb = new_skb;
+ unicast_packet = (struct unicast_packet *)skb->data;
+ }
+
+ /* decrement ttl */
+ unicast_packet->header.ttl--;
+
+ /* route it */
+ send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
+ ret = NET_RX_SUCCESS;
+
+out:
+ if (neigh_node)
+ neigh_node_free_ref(neigh_node);
+ if (orig_node)
+ orig_node_free_ref(orig_node);
+ return ret;
+}
+
+static int check_unicast_ttvn(struct bat_priv *bat_priv,
+ struct sk_buff *skb) {
+ uint8_t curr_ttvn;
+ struct orig_node *orig_node;
+ struct ethhdr *ethhdr;
+ struct hard_iface *primary_if;
+ struct unicast_packet *unicast_packet;
+ bool tt_poss_change;
+
+ /* I could need to modify it */
+ if (skb_cow(skb, sizeof(struct unicast_packet)) < 0)
+ return 0;
+
+ unicast_packet = (struct unicast_packet *)skb->data;
+
+ if (is_my_mac(unicast_packet->dest)) {
+ tt_poss_change = bat_priv->tt_poss_change;
+ curr_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
+ } else {
+ orig_node = orig_hash_find(bat_priv, unicast_packet->dest);
+
+ if (!orig_node)
+ return 0;
+
+ curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
+ tt_poss_change = orig_node->tt_poss_change;
+ orig_node_free_ref(orig_node);
+ }
+
+ /* Check whether I have to reroute the packet */
+ if (seq_before(unicast_packet->ttvn, curr_ttvn) || tt_poss_change) {
+ /* Linearize the skb before accessing it */
+ if (skb_linearize(skb) < 0)
+ return 0;
+
+ ethhdr = (struct ethhdr *)(skb->data +
+ sizeof(struct unicast_packet));
+ orig_node = transtable_search(bat_priv, NULL, ethhdr->h_dest);
+
+ if (!orig_node) {
+ if (!is_my_client(bat_priv, ethhdr->h_dest))
+ return 0;
+ primary_if = primary_if_get_selected(bat_priv);
+ if (!primary_if)
+ return 0;
+ memcpy(unicast_packet->dest,
+ primary_if->net_dev->dev_addr, ETH_ALEN);
+ hardif_free_ref(primary_if);
+ } else {
+ memcpy(unicast_packet->dest, orig_node->orig,
+ ETH_ALEN);
+ curr_ttvn = (uint8_t)
+ atomic_read(&orig_node->last_ttvn);
+ orig_node_free_ref(orig_node);
+ }
+
+ bat_dbg(DBG_ROUTES, bat_priv,
+ "TTVN mismatch (old_ttvn %u new_ttvn %u)! Rerouting unicast packet (for %pM) to %pM\n",
+ unicast_packet->ttvn, curr_ttvn, ethhdr->h_dest,
+ unicast_packet->dest);
+
+ unicast_packet->ttvn = curr_ttvn;
+ }
+ return 1;
+}
+
+int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
+{
+ struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+ struct unicast_packet *unicast_packet;
+ int hdr_size = sizeof(*unicast_packet);
+
+ if (check_unicast_packet(skb, hdr_size) < 0)
+ return NET_RX_DROP;
+
+ if (!check_unicast_ttvn(bat_priv, skb))
+ return NET_RX_DROP;
+
+ unicast_packet = (struct unicast_packet *)skb->data;
+
+ /* packet for me */
+ if (is_my_mac(unicast_packet->dest)) {
+ interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
+ return NET_RX_SUCCESS;
+ }
+
+ return route_unicast_packet(skb, recv_if);
+}
+
+int recv_ucast_frag_packet(struct sk_buff *skb, struct hard_iface *recv_if)
+{
+ struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+ struct unicast_frag_packet *unicast_packet;
+ int hdr_size = sizeof(*unicast_packet);
+ struct sk_buff *new_skb = NULL;
+ int ret;
+
+ if (check_unicast_packet(skb, hdr_size) < 0)
+ return NET_RX_DROP;
+
+ if (!check_unicast_ttvn(bat_priv, skb))
+ return NET_RX_DROP;
+
+ unicast_packet = (struct unicast_frag_packet *)skb->data;
+
+ /* packet for me */
+ if (is_my_mac(unicast_packet->dest)) {
+
+ ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
+
+ if (ret == NET_RX_DROP)
+ return NET_RX_DROP;
+
+ /* packet was buffered for late merge */
+ if (!new_skb)
+ return NET_RX_SUCCESS;
+
+ interface_rx(recv_if->soft_iface, new_skb, recv_if,
+ sizeof(struct unicast_packet));
+ return NET_RX_SUCCESS;
+ }
+
+ return route_unicast_packet(skb, recv_if);
+}
+
+
+int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
+{
+ struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+ struct orig_node *orig_node = NULL;
+ struct bcast_packet *bcast_packet;
+ struct ethhdr *ethhdr;
+ int hdr_size = sizeof(*bcast_packet);
+ int ret = NET_RX_DROP;
+ int32_t seq_diff;
+
+ /* drop packet if it has not necessary minimum size */
+ if (unlikely(!pskb_may_pull(skb, hdr_size)))
+ goto out;
+
+ ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+ /* packet with broadcast indication but unicast recipient */
+ if (!is_broadcast_ether_addr(ethhdr->h_dest))
+ goto out;
+
+ /* packet with broadcast sender address */
+ if (is_broadcast_ether_addr(ethhdr->h_source))
+ goto out;
+
+ /* ignore broadcasts sent by myself */
+ if (is_my_mac(ethhdr->h_source))
+ goto out;
+
+ bcast_packet = (struct bcast_packet *)skb->data;
+
+ /* ignore broadcasts originated by myself */
+ if (is_my_mac(bcast_packet->orig))
+ goto out;
+
+ if (bcast_packet->header.ttl < 2)
+ goto out;
+
+ orig_node = orig_hash_find(bat_priv, bcast_packet->orig);
+
+ if (!orig_node)
+ goto out;
+
+ spin_lock_bh(&orig_node->bcast_seqno_lock);
+
+ /* check whether the packet is a duplicate */
+ if (get_bit_status(orig_node->bcast_bits, orig_node->last_bcast_seqno,
+ ntohl(bcast_packet->seqno)))
+ goto spin_unlock;
+
+ seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
+
+ /* check whether the packet is old and the host just restarted. */
+ if (window_protected(bat_priv, seq_diff,
+ &orig_node->bcast_seqno_reset))
+ goto spin_unlock;
+
+ /* mark broadcast in flood history, update window position
+ * if required. */
+ if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
+ orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
+
+ spin_unlock_bh(&orig_node->bcast_seqno_lock);
+
+ /* rebroadcast packet */
+ add_bcast_packet_to_list(bat_priv, skb, 1);
+
+ /* broadcast for me */
+ interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
+ ret = NET_RX_SUCCESS;
+ goto out;
+
+spin_unlock:
+ spin_unlock_bh(&orig_node->bcast_seqno_lock);
+out:
+ if (orig_node)
+ orig_node_free_ref(orig_node);
+ return ret;
+}
+
+int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if)
+{
+ struct vis_packet *vis_packet;
+ struct ethhdr *ethhdr;
+ struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+ int hdr_size = sizeof(*vis_packet);
+
+ /* keep skb linear */
+ if (skb_linearize(skb) < 0)
+ return NET_RX_DROP;
+
+ if (unlikely(!pskb_may_pull(skb, hdr_size)))
+ return NET_RX_DROP;
+
+ vis_packet = (struct vis_packet *)skb->data;
+ ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+ /* not for me */
+ if (!is_my_mac(ethhdr->h_dest))
+ return NET_RX_DROP;
+
+ /* ignore own packets */
+ if (is_my_mac(vis_packet->vis_orig))
+ return NET_RX_DROP;
+
+ if (is_my_mac(vis_packet->sender_orig))
+ return NET_RX_DROP;
+
+ switch (vis_packet->vis_type) {
+ case VIS_TYPE_SERVER_SYNC:
+ receive_server_sync_packet(bat_priv, vis_packet,
+ skb_headlen(skb));
+ break;
+
+ case VIS_TYPE_CLIENT_UPDATE:
+ receive_client_update_packet(bat_priv, vis_packet,
+ skb_headlen(skb));
+ break;
+
+ default: /* ignore unknown packet */
+ break;
+ }
+
+ /* We take a copy of the data in the packet, so we should
+ always free the skbuf. */
+ return NET_RX_DROP;
+}