diff options
Diffstat (limited to 'net/batman-adv/routing.c')
| -rw-r--r-- | net/batman-adv/routing.c | 1516 |
1 files changed, 733 insertions, 783 deletions
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index 773e606f970..35141534938 100644 --- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -1,5 +1,4 @@ -/* - * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2014 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich * @@ -13,10 +12,7 @@ * 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 - * + * along with this program; if not, see <http://www.gnu.org/licenses/>. */ #include "main.h" @@ -27,199 +23,105 @@ #include "icmp_socket.h" #include "translation-table.h" #include "originator.h" -#include "vis.h" -#include "unicast.h" -#include "bat_ogm.h" - -void slide_own_bcast_window(struct hard_iface *hard_iface) +#include "bridge_loop_avoidance.h" +#include "distributed-arp-table.h" +#include "network-coding.h" +#include "fragmentation.h" + +#include <linux/if_vlan.h> + +static int batadv_route_unicast_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if); + +/** + * _batadv_update_route - set the router for this originator + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig node which is to be configured + * @recv_if: the receive interface for which this route is set + * @neigh_node: neighbor which should be the next router + * + * This function does not perform any error checks + */ +static void _batadv_update_route(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_hard_iface *recv_if, + struct batadv_neigh_node *neigh_node) { - 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(); - } -} + struct batadv_orig_ifinfo *orig_ifinfo; + struct batadv_neigh_node *curr_router; -static void _update_route(struct bat_priv *bat_priv, - struct orig_node *orig_node, - struct neigh_node *neigh_node) -{ - struct neigh_node *curr_router; + orig_ifinfo = batadv_orig_ifinfo_get(orig_node, recv_if); + if (!orig_ifinfo) + return; - curr_router = orig_node_get_router(orig_node); + rcu_read_lock(); + curr_router = rcu_dereference(orig_ifinfo->router); + if (curr_router && !atomic_inc_not_zero(&curr_router->refcount)) + curr_router = NULL; + rcu_read_unlock(); /* 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"); + batadv_dbg(BATADV_DBG_ROUTES, bat_priv, + "Deleting route towards: %pM\n", orig_node->orig); + batadv_tt_global_del_orig(bat_priv, orig_node, -1, + "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); + batadv_dbg(BATADV_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); + batadv_dbg(BATADV_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); + batadv_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); + rcu_assign_pointer(orig_ifinfo->router, neigh_node); spin_unlock_bh(&orig_node->neigh_list_lock); + batadv_orig_ifinfo_free_ref(orig_ifinfo); /* decrease refcount of previous best neighbor */ if (curr_router) - neigh_node_free_ref(curr_router); + batadv_neigh_node_free_ref(curr_router); } -void update_route(struct bat_priv *bat_priv, struct orig_node *orig_node, - struct neigh_node *neigh_node) +/** + * batadv_update_route - set the router for this originator + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: orig node which is to be configured + * @recv_if: the receive interface for which this route is set + * @neigh_node: neighbor which should be the next router + */ +void batadv_update_route(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_hard_iface *recv_if, + struct batadv_neigh_node *neigh_node) { - struct neigh_node *router = NULL; + struct batadv_neigh_node *router = NULL; if (!orig_node) goto out; - router = orig_node_get_router(orig_node); + router = batadv_orig_router_get(orig_node, recv_if); 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); + _batadv_update_route(bat_priv, orig_node, recv_if, 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); + batadv_neigh_node_free_ref(router); } /* checks whether the host restarted and is in the protection time. @@ -227,192 +129,186 @@ void bonding_save_primary(const struct orig_node *orig_node, * 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) +int batadv_window_protected(struct batadv_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 (time_after(jiffies, *last_reset + - msecs_to_jiffies(RESET_PROTECTION_MS))) { - - *last_reset = jiffies; - bat_dbg(DBG_BATMAN, bat_priv, - "old packet received, start protection\n"); - - return 0; - } else + if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE || + seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { + if (!batadv_has_timed_out(*last_reset, + BATADV_RESET_PROTECTION_MS)) return 1; + + *last_reset = jiffies; + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "old packet received, start protection\n"); } + return 0; } -int recv_bat_ogm_packet(struct sk_buff *skb, struct hard_iface *hard_iface) +bool batadv_check_management_packet(struct sk_buff *skb, + struct batadv_hard_iface *hard_iface, + int header_len) { 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; + if (unlikely(!pskb_may_pull(skb, header_len))) + return false; - ethhdr = (struct ethhdr *)skb_mac_header(skb); + ethhdr = eth_hdr(skb); /* packet with broadcast indication but unicast recipient */ if (!is_broadcast_ether_addr(ethhdr->h_dest)) - return NET_RX_DROP; + return false; /* packet with broadcast sender address */ if (is_broadcast_ether_addr(ethhdr->h_source)) - return NET_RX_DROP; + return false; /* create a copy of the skb, if needed, to modify it. */ if (skb_cow(skb, 0) < 0) - return NET_RX_DROP; + return false; /* keep skb linear */ if (skb_linearize(skb) < 0) - return NET_RX_DROP; - - ethhdr = (struct ethhdr *)skb_mac_header(skb); - - bat_ogm_receive(ethhdr, skb->data, skb_headlen(skb), hard_iface); + return false; - kfree_skb(skb); - return NET_RX_SUCCESS; + return true; } -static int recv_my_icmp_packet(struct bat_priv *bat_priv, - struct sk_buff *skb, size_t icmp_len) +/** + * batadv_recv_my_icmp_packet - receive an icmp packet locally + * @bat_priv: the bat priv with all the soft interface information + * @skb: icmp packet to process + * + * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP + * otherwise. + */ +static int batadv_recv_my_icmp_packet(struct batadv_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_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; + struct batadv_hard_iface *primary_if = NULL; + struct batadv_orig_node *orig_node = NULL; + struct batadv_icmp_header *icmph; + int res, ret = NET_RX_DROP; + + icmph = (struct batadv_icmp_header *)skb->data; + + switch (icmph->msg_type) { + case BATADV_ECHO_REPLY: + case BATADV_DESTINATION_UNREACHABLE: + case BATADV_TTL_EXCEEDED: + /* receive the packet */ + if (skb_linearize(skb) < 0) + break; - /* answer echo request (ping) */ - /* get routing information */ - orig_node = orig_hash_find(bat_priv, icmp_packet->orig); - if (!orig_node) - goto out; + batadv_socket_receive_packet(icmph, skb->len); + break; + case BATADV_ECHO_REQUEST: + /* answer echo request (ping) */ + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + goto out; - router = orig_node_get_router(orig_node); - if (!router) - goto out; + /* get routing information */ + orig_node = batadv_orig_hash_find(bat_priv, icmph->orig); + if (!orig_node) + goto out; - /* create a copy of the skb, if needed, to modify it. */ - if (skb_cow(skb, sizeof(struct ethhdr)) < 0) - goto out; + /* create a copy of the skb, if needed, to modify it. */ + if (skb_cow(skb, ETH_HLEN) < 0) + goto out; - icmp_packet = (struct icmp_packet_rr *)skb->data; + icmph = (struct batadv_icmp_header *)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->ttl = TTL; + ether_addr_copy(icmph->dst, icmph->orig); + ether_addr_copy(icmph->orig, primary_if->net_dev->dev_addr); + icmph->msg_type = BATADV_ECHO_REPLY; + icmph->ttl = BATADV_TTL; - send_skb_packet(skb, router->if_incoming, router->addr); - ret = NET_RX_SUCCESS; + res = batadv_send_skb_to_orig(skb, orig_node, NULL); + if (res != NET_XMIT_DROP) + ret = NET_RX_SUCCESS; + break; + default: + /* drop unknown type */ + goto out; + } out: if (primary_if) - hardif_free_ref(primary_if); - if (router) - neigh_node_free_ref(router); + batadv_hardif_free_ref(primary_if); if (orig_node) - orig_node_free_ref(orig_node); + batadv_orig_node_free_ref(orig_node); return ret; } -static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv, - struct sk_buff *skb) +static int batadv_recv_icmp_ttl_exceeded(struct batadv_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; + struct batadv_hard_iface *primary_if = NULL; + struct batadv_orig_node *orig_node = NULL; + struct batadv_icmp_packet *icmp_packet; int ret = NET_RX_DROP; - icmp_packet = (struct icmp_packet *)skb->data; + icmp_packet = (struct batadv_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); + if (icmp_packet->msg_type != BATADV_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); + primary_if = batadv_primary_if_get_selected(bat_priv); if (!primary_if) goto out; /* get routing information */ - orig_node = orig_hash_find(bat_priv, icmp_packet->orig); + orig_node = batadv_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) + if (skb_cow(skb, ETH_HLEN) < 0) goto out; - icmp_packet = (struct icmp_packet *)skb->data; + icmp_packet = (struct batadv_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->ttl = TTL; + ether_addr_copy(icmp_packet->dst, icmp_packet->orig); + ether_addr_copy(icmp_packet->orig, primary_if->net_dev->dev_addr); + icmp_packet->msg_type = BATADV_TTL_EXCEEDED; + icmp_packet->ttl = BATADV_TTL; - send_skb_packet(skb, router->if_incoming, router->addr); - ret = NET_RX_SUCCESS; + if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) + ret = NET_RX_SUCCESS; out: if (primary_if) - hardif_free_ref(primary_if); - if (router) - neigh_node_free_ref(router); + batadv_hardif_free_ref(primary_if); if (orig_node) - orig_node_free_ref(orig_node); + batadv_orig_node_free_ref(orig_node); return ret; } -int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if) +int batadv_recv_icmp_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if) { - struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); - struct icmp_packet_rr *icmp_packet; + struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_icmp_header *icmph; + struct batadv_icmp_packet_rr *icmp_packet_rr; struct ethhdr *ethhdr; - struct orig_node *orig_node = NULL; - struct neigh_node *router = NULL; - int hdr_size = sizeof(struct icmp_packet); + struct batadv_orig_node *orig_node = NULL; + int hdr_size = sizeof(struct batadv_icmp_header); 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); + ethhdr = eth_hdr(skb); /* packet with unicast indication but broadcast recipient */ if (is_broadcast_ether_addr(ethhdr->h_dest)) @@ -423,605 +319,685 @@ int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if) goto out; /* not for me */ - if (!is_my_mac(ethhdr->h_dest)) + if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) goto out; - icmp_packet = (struct icmp_packet_rr *)skb->data; + icmph = (struct batadv_icmp_header *)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++; + if ((icmph->msg_type == BATADV_ECHO_REPLY || + icmph->msg_type == BATADV_ECHO_REQUEST) && + (skb->len >= sizeof(struct batadv_icmp_packet_rr))) { + if (skb_linearize(skb) < 0) + goto out; + + /* create a copy of the skb, if needed, to modify it. */ + if (skb_cow(skb, ETH_HLEN) < 0) + goto out; + + icmph = (struct batadv_icmp_header *)skb->data; + icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph; + if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN) + goto out; + + ether_addr_copy(icmp_packet_rr->rr[icmp_packet_rr->rr_cur], + ethhdr->h_dest); + icmp_packet_rr->rr_cur++; } /* packet for me */ - if (is_my_mac(icmp_packet->dst)) - return recv_my_icmp_packet(bat_priv, skb, hdr_size); + if (batadv_is_my_mac(bat_priv, icmph->dst)) + return batadv_recv_my_icmp_packet(bat_priv, skb); /* TTL exceeded */ - if (icmp_packet->ttl < 2) - return recv_icmp_ttl_exceeded(bat_priv, skb); + if (icmph->ttl < 2) + return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); /* get routing information */ - orig_node = orig_hash_find(bat_priv, icmp_packet->dst); + orig_node = batadv_orig_hash_find(bat_priv, icmph->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) + if (skb_cow(skb, ETH_HLEN) < 0) goto out; - icmp_packet = (struct icmp_packet_rr *)skb->data; + icmph = (struct batadv_icmp_header *)skb->data; /* decrement ttl */ - icmp_packet->ttl--; + icmph->ttl--; /* route it */ - send_skb_packet(skb, router->if_incoming, router->addr); - ret = NET_RX_SUCCESS; + if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP) + ret = NET_RX_SUCCESS; out: - if (router) - neigh_node_free_ref(router); if (orig_node) - orig_node_free_ref(orig_node); + batadv_orig_node_free_ref(orig_node); return ret; } -/* In the bonding case, send the packets in a round - * robin fashion over the remaining interfaces. +/** + * batadv_check_unicast_packet - Check for malformed unicast packets + * @bat_priv: the bat priv with all the soft interface information + * @skb: packet to check + * @hdr_size: size of header to pull * - * 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; - - 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) + * Check for short header and bad addresses in given packet. Returns negative + * value when check fails and 0 otherwise. The negative value depends on the + * reason: -ENODATA for bad header, -EBADR for broadcast destination or source, + * and -EREMOTE for non-local (other host) destination. + */ +static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, + struct sk_buff *skb, int hdr_size) { - 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; + if (unlikely(!pskb_may_pull(skb, hdr_size))) + return -ENODATA; - ethhdr = (struct ethhdr *)skb_mac_header(skb); + ethhdr = eth_hdr(skb); /* packet with unicast indication but broadcast recipient */ if (is_broadcast_ether_addr(ethhdr->h_dest)) - goto out; + return -EBADR; /* 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; + return -EBADR; - 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; + /* not for me */ + if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) + return -EREMOTE; - orig_node_free_ref(orig_node); -out: - /* returning NET_RX_DROP will make the caller function kfree the skb */ - return NET_RX_DROP; + return 0; } -/* 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) +/** + * batadv_find_router - find a suitable router for this originator + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: the destination node + * @recv_if: pointer to interface this packet was received on + * + * Returns the router which should be used for this orig_node on + * this interface, or NULL if not available. + */ +struct batadv_neigh_node * +batadv_find_router(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_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; + struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; + struct batadv_neigh_node *first_candidate_router = NULL; + struct batadv_neigh_node *next_candidate_router = NULL; + struct batadv_neigh_node *router, *cand_router = NULL; + struct batadv_neigh_node *last_cand_router = NULL; + struct batadv_orig_ifinfo *cand, *first_candidate = NULL; + struct batadv_orig_ifinfo *next_candidate = NULL; + struct batadv_orig_ifinfo *last_candidate; + bool last_candidate_found = false; 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); + router = batadv_orig_router_get(orig_node, recv_if); + /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop) + * and if activated. + */ + if (recv_if == BATADV_IF_DEFAULT || !atomic_read(&bat_priv->bonding) || + !router) + return router; + + /* bonding: loop through the list of possible routers found + * for the various outgoing interfaces and find a candidate after + * the last chosen bonding candidate (next_candidate). If no such + * router is found, use the first candidate found (the previously + * chosen bonding candidate might have been the last one in the list). + * If this can't be found either, return the previously choosen + * router - obviously there are no other candidates. + */ 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; + last_candidate = orig_node->last_bonding_candidate; + if (last_candidate) + last_cand_router = rcu_dereference(last_candidate->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; + hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) { + /* acquire some structures and references ... */ + if (!atomic_inc_not_zero(&cand->refcount)) + continue; - /* all nodes between should choose a candidate which - * is is not on the interface where the packet came - * in. */ + cand_router = rcu_dereference(cand->router); + if (!cand_router) + goto next; - neigh_node_free_ref(router); + if (!atomic_inc_not_zero(&cand_router->refcount)) { + cand_router = NULL; + goto next; + } - if (bonding_enabled) - router = find_bond_router(primary_orig_node, recv_if); - else - router = find_ifalter_router(primary_orig_node, recv_if); + /* alternative candidate should be good enough to be + * considered + */ + if (!bao->bat_neigh_is_equiv_or_better(cand_router, + cand->if_outgoing, + router, recv_if)) + goto next; + + /* don't use the same router twice */ + if (last_cand_router == cand_router) + goto next; + + /* mark the first possible candidate */ + if (!first_candidate) { + atomic_inc(&cand_router->refcount); + atomic_inc(&cand->refcount); + first_candidate = cand; + first_candidate_router = cand_router; + } -return_router: - if (router && router->if_incoming->if_status != IF_ACTIVE) - goto err_unlock; + /* check if the loop has already passed the previously selected + * candidate ... this function should select the next candidate + * AFTER the previously used bonding candidate. + */ + if (!last_candidate || last_candidate_found) { + next_candidate = cand; + next_candidate_router = cand_router; + break; + } + if (last_candidate == cand) + last_candidate_found = true; +next: + /* free references */ + if (cand_router) { + batadv_neigh_node_free_ref(cand_router); + cand_router = NULL; + } + batadv_orig_ifinfo_free_ref(cand); + } 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); + /* last_bonding_candidate is reset below, remove the old reference. */ + if (orig_node->last_bonding_candidate) + batadv_orig_ifinfo_free_ref(orig_node->last_bonding_candidate); - /* 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; + /* After finding candidates, handle the three cases: + * 1) there is a next candidate, use that + * 2) there is no next candidate, use the first of the list + * 3) there is no candidate at all, return the default router + */ + if (next_candidate) { + batadv_neigh_node_free_ref(router); - /* not for me */ - if (!is_my_mac(ethhdr->h_dest)) - return -1; + /* remove references to first candidate, we don't need it. */ + if (first_candidate) { + batadv_neigh_node_free_ref(first_candidate_router); + batadv_orig_ifinfo_free_ref(first_candidate); + } + router = next_candidate_router; + orig_node->last_bonding_candidate = next_candidate; + } else if (first_candidate) { + batadv_neigh_node_free_ref(router); + + /* refcounting has already been done in the loop above. */ + router = first_candidate_router; + orig_node->last_bonding_candidate = first_candidate; + } else { + orig_node->last_bonding_candidate = NULL; + } - return 0; + return router; } -int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) +static int batadv_route_unicast_packet(struct sk_buff *skb, + struct batadv_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; + struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_orig_node *orig_node = NULL; + struct batadv_unicast_packet *unicast_packet; + struct ethhdr *ethhdr = eth_hdr(skb); + int res, hdr_len, ret = NET_RX_DROP; - unicast_packet = (struct unicast_packet *)skb->data; + unicast_packet = (struct batadv_unicast_packet *)skb->data; /* TTL exceeded */ if (unicast_packet->ttl < 2) { - pr_debug("Warning - can't forward unicast packet from %pM to " - "%pM: ttl exceeded\n", ethhdr->h_source, - unicast_packet->dest); + 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); + orig_node = batadv_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) + if (skb_cow(skb, ETH_HLEN) < 0) goto out; - unicast_packet = (struct unicast_packet *)skb->data; + /* decrement ttl */ + unicast_packet = (struct batadv_unicast_packet *)skb->data; + unicast_packet->ttl--; - if (unicast_packet->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; + switch (unicast_packet->packet_type) { + case BATADV_UNICAST_4ADDR: + hdr_len = sizeof(struct batadv_unicast_4addr_packet); + break; + case BATADV_UNICAST: + hdr_len = sizeof(struct batadv_unicast_packet); + break; + default: + /* other packet types not supported - yet */ + hdr_len = -1; + break; } - if (unicast_packet->packet_type == BAT_UNICAST_FRAG && - frag_can_reassemble(skb, neigh_node->if_incoming->net_dev->mtu)) { + if (hdr_len > 0) + batadv_skb_set_priority(skb, hdr_len); + + res = batadv_send_skb_to_orig(skb, orig_node, recv_if); + + /* translate transmit result into receive result */ + if (res == NET_XMIT_SUCCESS) { + /* skb was transmitted and consumed */ + batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); + batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, + skb->len + ETH_HLEN); - ret = frag_reassemble_skb(skb, bat_priv, &new_skb); + ret = NET_RX_SUCCESS; + } else if (res == NET_XMIT_POLICED) { + /* skb was buffered and consumed */ + ret = NET_RX_SUCCESS; + } + +out: + if (orig_node) + batadv_orig_node_free_ref(orig_node); + return ret; +} - if (ret == NET_RX_DROP) +/** + * batadv_reroute_unicast_packet - update the unicast header for re-routing + * @bat_priv: the bat priv with all the soft interface information + * @unicast_packet: the unicast header to be updated + * @dst_addr: the payload destination + * @vid: VLAN identifier + * + * Search the translation table for dst_addr and update the unicast header with + * the new corresponding information (originator address where the destination + * client currently is and its known TTVN) + * + * Returns true if the packet header has been updated, false otherwise + */ +static bool +batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, + struct batadv_unicast_packet *unicast_packet, + uint8_t *dst_addr, unsigned short vid) +{ + struct batadv_orig_node *orig_node = NULL; + struct batadv_hard_iface *primary_if = NULL; + bool ret = false; + uint8_t *orig_addr, orig_ttvn; + + if (batadv_is_my_client(bat_priv, dst_addr, vid)) { + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + goto out; + orig_addr = primary_if->net_dev->dev_addr; + orig_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); + } else { + orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr, + vid); + if (!orig_node) goto out; - /* packet was buffered for late merge */ - if (!new_skb) { - ret = NET_RX_SUCCESS; + if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) goto out; - } - skb = new_skb; - unicast_packet = (struct unicast_packet *)skb->data; + orig_addr = orig_node->orig; + orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); } - /* decrement ttl */ - unicast_packet->ttl--; - - /* route it */ - send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); - ret = NET_RX_SUCCESS; + /* update the packet header */ + ether_addr_copy(unicast_packet->dest, orig_addr); + unicast_packet->ttvn = orig_ttvn; + ret = true; out: - if (neigh_node) - neigh_node_free_ref(neigh_node); + if (primary_if) + batadv_hardif_free_ref(primary_if); if (orig_node) - orig_node_free_ref(orig_node); + batadv_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; +static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, + struct sk_buff *skb, int hdr_len) { + struct batadv_unicast_packet *unicast_packet; + struct batadv_hard_iface *primary_if; + struct batadv_orig_node *orig_node; + uint8_t curr_ttvn, old_ttvn; struct ethhdr *ethhdr; - struct hard_iface *primary_if; - struct unicast_packet *unicast_packet; - bool tt_poss_change; + unsigned short vid; + int is_old_ttvn; - /* I could need to modify it */ - if (skb_cow(skb, sizeof(struct unicast_packet)) < 0) + /* check if there is enough data before accessing it */ + if (!pskb_may_pull(skb, hdr_len + ETH_HLEN)) return 0; - unicast_packet = (struct unicast_packet *)skb->data; + /* create a copy of the skb (in case of for re-routing) to modify it. */ + if (skb_cow(skb, sizeof(*unicast_packet)) < 0) + return 0; - 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); + unicast_packet = (struct batadv_unicast_packet *)skb->data; + vid = batadv_get_vid(skb, hdr_len); + ethhdr = (struct ethhdr *)(skb->data + hdr_len); + /* check if the destination client was served by this node and it is now + * roaming. In this case, it means that the node has got a ROAM_ADV + * message and that it knows the new destination in the mesh to re-route + * the packet to + */ + if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) { + if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, + ethhdr->h_dest, vid)) + net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, + bat_priv, + "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", + unicast_packet->dest, + ethhdr->h_dest); + /* at this point the mesh destination should have been + * substituted with the originator address found in the global + * table. If not, let the packet go untouched anyway because + * there is nothing the node can do + */ + return 1; + } + + /* retrieve the TTVN known by this node for the packet destination. This + * value is used later to check if the node which sent (or re-routed + * last time) the packet had an updated information or not + */ + curr_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); + if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { + orig_node = batadv_orig_hash_find(bat_priv, + unicast_packet->dest); + /* if it is not possible to find the orig_node representing the + * destination, the packet can immediately be dropped as it will + * not be possible to deliver it + */ 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); + batadv_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; + /* check if the TTVN contained in the packet is fresher than what the + * node knows + */ + is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); + if (!is_old_ttvn) + return 1; + + old_ttvn = unicast_packet->ttvn; + /* the packet was forged based on outdated network information. Its + * destination can possibly be updated and forwarded towards the new + * target host + */ + if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, + ethhdr->h_dest, vid)) { + net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, bat_priv, + "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", + unicast_packet->dest, ethhdr->h_dest, + old_ttvn, curr_ttvn); + return 1; + } - 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); - } + /* the packet has not been re-routed: either the destination is + * currently served by this node or there is no destination at all and + * it is possible to drop the packet + */ + if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid)) + return 0; + + /* update the header in order to let the packet be delivered to this + * node's soft interface + */ + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + return 0; - 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); + ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr); + + batadv_hardif_free_ref(primary_if); + + unicast_packet->ttvn = curr_ttvn; - unicast_packet->ttvn = curr_ttvn; - } return 1; } -int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) +/** + * batadv_recv_unhandled_unicast_packet - receive and process packets which + * are in the unicast number space but not yet known to the implementation + * @skb: unicast tvlv packet to process + * @recv_if: pointer to interface this packet was received on + * + * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP + * otherwise. + */ +int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, + struct batadv_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); + struct batadv_unicast_packet *unicast_packet; + struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + int check, hdr_size = sizeof(*unicast_packet); - if (check_unicast_packet(skb, hdr_size) < 0) + check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); + if (check < 0) return NET_RX_DROP; - if (!check_unicast_ttvn(bat_priv, skb)) + /* we don't know about this type, drop it. */ + unicast_packet = (struct batadv_unicast_packet *)skb->data; + if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) return NET_RX_DROP; - unicast_packet = (struct unicast_packet *)skb->data; + return batadv_route_unicast_packet(skb, recv_if); +} + +int batadv_recv_unicast_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if) +{ + struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_unicast_packet *unicast_packet; + struct batadv_unicast_4addr_packet *unicast_4addr_packet; + uint8_t *orig_addr; + struct batadv_orig_node *orig_node = NULL; + int check, hdr_size = sizeof(*unicast_packet); + bool is4addr; + + unicast_packet = (struct batadv_unicast_packet *)skb->data; + unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; + + is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR; + /* the caller function should have already pulled 2 bytes */ + if (is4addr) + hdr_size = sizeof(*unicast_4addr_packet); + + /* function returns -EREMOTE for promiscuous packets */ + check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); + + /* Even though the packet is not for us, we might save it to use for + * decoding a later received coded packet + */ + if (check == -EREMOTE) + batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); + + if (check < 0) + return NET_RX_DROP; + if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) + return NET_RX_DROP; /* packet for me */ - if (is_my_mac(unicast_packet->dest)) { - interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); + if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { + if (is4addr) { + batadv_dat_inc_counter(bat_priv, + unicast_4addr_packet->subtype); + orig_addr = unicast_4addr_packet->src; + orig_node = batadv_orig_hash_find(bat_priv, orig_addr); + } + + if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, + hdr_size)) + goto rx_success; + if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, + hdr_size)) + goto rx_success; + + batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, + orig_node); + +rx_success: + if (orig_node) + batadv_orig_node_free_ref(orig_node); + return NET_RX_SUCCESS; } - return route_unicast_packet(skb, recv_if); + return batadv_route_unicast_packet(skb, recv_if); } -int recv_ucast_frag_packet(struct sk_buff *skb, struct hard_iface *recv_if) +/** + * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets + * @skb: unicast tvlv packet to process + * @recv_if: pointer to interface this packet was received on + * @dst_addr: the payload destination + * + * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP + * otherwise. + */ +int batadv_recv_unicast_tvlv(struct sk_buff *skb, + struct batadv_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; + struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; + unsigned char *tvlv_buff; + uint16_t tvlv_buff_len; + int hdr_size = sizeof(*unicast_tvlv_packet); + int ret = NET_RX_DROP; - if (check_unicast_packet(skb, hdr_size) < 0) + if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) return NET_RX_DROP; - if (!check_unicast_ttvn(bat_priv, skb)) + /* the header is likely to be modified while forwarding */ + if (skb_cow(skb, hdr_size) < 0) return NET_RX_DROP; - unicast_packet = (struct unicast_frag_packet *)skb->data; + /* packet needs to be linearized to access the tvlv content */ + if (skb_linearize(skb) < 0) + return NET_RX_DROP; - /* packet for me */ - if (is_my_mac(unicast_packet->dest)) { + unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data; - ret = frag_reassemble_skb(skb, bat_priv, &new_skb); + tvlv_buff = (unsigned char *)(skb->data + hdr_size); + tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len); - if (ret == NET_RX_DROP) - return NET_RX_DROP; + if (tvlv_buff_len > skb->len - hdr_size) + return NET_RX_DROP; - /* packet was buffered for late merge */ - if (!new_skb) - return NET_RX_SUCCESS; + ret = batadv_tvlv_containers_process(bat_priv, false, NULL, + unicast_tvlv_packet->src, + unicast_tvlv_packet->dst, + tvlv_buff, tvlv_buff_len); - interface_rx(recv_if->soft_iface, new_skb, recv_if, - sizeof(struct unicast_packet)); - return NET_RX_SUCCESS; - } + if (ret != NET_RX_SUCCESS) + ret = batadv_route_unicast_packet(skb, recv_if); + else + consume_skb(skb); - return route_unicast_packet(skb, recv_if); + return ret; } +/** + * batadv_recv_frag_packet - process received fragment + * @skb: the received fragment + * @recv_if: interface that the skb is received on + * + * This function does one of the three following things: 1) Forward fragment, if + * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till + * lack further fragments; 3) Merge fragments, if we have all needed parts. + * + * Return NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise. + */ +int batadv_recv_frag_packet(struct sk_buff *skb, + struct batadv_hard_iface *recv_if) +{ + struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_orig_node *orig_node_src = NULL; + struct batadv_frag_packet *frag_packet; + int ret = NET_RX_DROP; + + if (batadv_check_unicast_packet(bat_priv, skb, + sizeof(*frag_packet)) < 0) + goto out; + + frag_packet = (struct batadv_frag_packet *)skb->data; + orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig); + if (!orig_node_src) + goto out; -int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if) + /* Route the fragment if it is not for us and too big to be merged. */ + if (!batadv_is_my_mac(bat_priv, frag_packet->dest) && + batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) { + ret = NET_RX_SUCCESS; + goto out; + } + + batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX); + batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len); + + /* Add fragment to buffer and merge if possible. */ + if (!batadv_frag_skb_buffer(&skb, orig_node_src)) + goto out; + + /* Deliver merged packet to the appropriate handler, if it was + * merged + */ + if (skb) + batadv_batman_skb_recv(skb, recv_if->net_dev, + &recv_if->batman_adv_ptype, NULL); + + ret = NET_RX_SUCCESS; + +out: + if (orig_node_src) + batadv_orig_node_free_ref(orig_node_src); + + return ret; +} + +int batadv_recv_bcast_packet(struct sk_buff *skb, + struct batadv_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 batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); + struct batadv_orig_node *orig_node = NULL; + struct batadv_bcast_packet *bcast_packet; struct ethhdr *ethhdr; int hdr_size = sizeof(*bcast_packet); int ret = NET_RX_DROP; int32_t seq_diff; + uint32_t seqno; /* 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); + ethhdr = eth_hdr(skb); /* packet with broadcast indication but unicast recipient */ if (!is_broadcast_ether_addr(ethhdr->h_dest)) @@ -1032,49 +1008,71 @@ int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if) goto out; /* ignore broadcasts sent by myself */ - if (is_my_mac(ethhdr->h_source)) + if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) goto out; - bcast_packet = (struct bcast_packet *)skb->data; + bcast_packet = (struct batadv_bcast_packet *)skb->data; /* ignore broadcasts originated by myself */ - if (is_my_mac(bcast_packet->orig)) + if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) goto out; if (bcast_packet->ttl < 2) goto out; - orig_node = orig_hash_find(bat_priv, bcast_packet->orig); + orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); if (!orig_node) goto out; spin_lock_bh(&orig_node->bcast_seqno_lock); + seqno = ntohl(bcast_packet->seqno); /* check whether the packet is a duplicate */ - if (get_bit_status(orig_node->bcast_bits, orig_node->last_bcast_seqno, - ntohl(bcast_packet->seqno))) + if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, + seqno)) goto spin_unlock; - seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; + seq_diff = 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)) + if (batadv_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); + * if required. + */ + if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) + orig_node->last_bcast_seqno = seqno; spin_unlock_bh(&orig_node->bcast_seqno_lock); + /* check whether this has been sent by another originator before */ + if (batadv_bla_check_bcast_duplist(bat_priv, skb)) + goto out; + + batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); + /* rebroadcast packet */ - add_bcast_packet_to_list(bat_priv, skb, 1); + batadv_add_bcast_packet_to_list(bat_priv, skb, 1); + + /* don't hand the broadcast up if it is from an originator + * from the same backbone. + */ + if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) + goto out; + + if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) + goto rx_success; + if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) + goto rx_success; /* broadcast for me */ - interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); + batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, + orig_node); + +rx_success: ret = NET_RX_SUCCESS; goto out; @@ -1082,54 +1080,6 @@ spin_unlock: spin_unlock_bh(&orig_node->bcast_seqno_lock); out: if (orig_node) - orig_node_free_ref(orig_node); + batadv_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; -} |