| /* Copyright (C) 2009-2012 B.A.T.M.A.N. contributors: |
| * |
| * Marek Lindner |
| * |
| * 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 "bat_sysfs.h" |
| #include "gateway_client.h" |
| #include "gateway_common.h" |
| #include "hard-interface.h" |
| #include "originator.h" |
| #include "translation-table.h" |
| #include "routing.h" |
| #include <linux/ip.h> |
| #include <linux/ipv6.h> |
| #include <linux/udp.h> |
| #include <linux/if_vlan.h> |
| |
| /* This is the offset of the options field in a dhcp packet starting at |
| * the beginning of the dhcp header |
| */ |
| #define BATADV_DHCP_OPTIONS_OFFSET 240 |
| #define BATADV_DHCP_REQUEST 3 |
| |
| static void batadv_gw_node_free_ref(struct gw_node *gw_node) |
| { |
| if (atomic_dec_and_test(&gw_node->refcount)) |
| kfree_rcu(gw_node, rcu); |
| } |
| |
| static struct gw_node *batadv_gw_get_selected_gw_node(struct bat_priv *bat_priv) |
| { |
| struct gw_node *gw_node; |
| |
| rcu_read_lock(); |
| gw_node = rcu_dereference(bat_priv->curr_gw); |
| if (!gw_node) |
| goto out; |
| |
| if (!atomic_inc_not_zero(&gw_node->refcount)) |
| gw_node = NULL; |
| |
| out: |
| rcu_read_unlock(); |
| return gw_node; |
| } |
| |
| struct orig_node *batadv_gw_get_selected_orig(struct bat_priv *bat_priv) |
| { |
| struct gw_node *gw_node; |
| struct orig_node *orig_node = NULL; |
| |
| gw_node = batadv_gw_get_selected_gw_node(bat_priv); |
| if (!gw_node) |
| goto out; |
| |
| rcu_read_lock(); |
| orig_node = gw_node->orig_node; |
| if (!orig_node) |
| goto unlock; |
| |
| if (!atomic_inc_not_zero(&orig_node->refcount)) |
| orig_node = NULL; |
| |
| unlock: |
| rcu_read_unlock(); |
| out: |
| if (gw_node) |
| batadv_gw_node_free_ref(gw_node); |
| return orig_node; |
| } |
| |
| static void batadv_gw_select(struct bat_priv *bat_priv, |
| struct gw_node *new_gw_node) |
| { |
| struct gw_node *curr_gw_node; |
| |
| spin_lock_bh(&bat_priv->gw_list_lock); |
| |
| if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount)) |
| new_gw_node = NULL; |
| |
| curr_gw_node = rcu_dereference_protected(bat_priv->curr_gw, 1); |
| rcu_assign_pointer(bat_priv->curr_gw, new_gw_node); |
| |
| if (curr_gw_node) |
| batadv_gw_node_free_ref(curr_gw_node); |
| |
| spin_unlock_bh(&bat_priv->gw_list_lock); |
| } |
| |
| void batadv_gw_deselect(struct bat_priv *bat_priv) |
| { |
| atomic_set(&bat_priv->gw_reselect, 1); |
| } |
| |
| static struct gw_node *batadv_gw_get_best_gw_node(struct bat_priv *bat_priv) |
| { |
| struct neigh_node *router; |
| struct hlist_node *node; |
| struct gw_node *gw_node, *curr_gw = NULL; |
| uint32_t max_gw_factor = 0, tmp_gw_factor = 0; |
| uint8_t max_tq = 0; |
| int down, up; |
| struct orig_node *orig_node; |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { |
| if (gw_node->deleted) |
| continue; |
| |
| orig_node = gw_node->orig_node; |
| router = batadv_orig_node_get_router(orig_node); |
| if (!router) |
| continue; |
| |
| if (!atomic_inc_not_zero(&gw_node->refcount)) |
| goto next; |
| |
| switch (atomic_read(&bat_priv->gw_sel_class)) { |
| case 1: /* fast connection */ |
| batadv_gw_bandwidth_to_kbit(orig_node->gw_flags, |
| &down, &up); |
| |
| tmp_gw_factor = (router->tq_avg * router->tq_avg * |
| down * 100 * 100) / |
| (BATADV_TQ_LOCAL_WINDOW_SIZE * |
| BATADV_TQ_LOCAL_WINDOW_SIZE * 64); |
| |
| if ((tmp_gw_factor > max_gw_factor) || |
| ((tmp_gw_factor == max_gw_factor) && |
| (router->tq_avg > max_tq))) { |
| if (curr_gw) |
| batadv_gw_node_free_ref(curr_gw); |
| curr_gw = gw_node; |
| atomic_inc(&curr_gw->refcount); |
| } |
| break; |
| |
| default: /* 2: stable connection (use best statistic) |
| * 3: fast-switch (use best statistic but change as |
| * soon as a better gateway appears) |
| * XX: late-switch (use best statistic but change as |
| * soon as a better gateway appears which has |
| * $routing_class more tq points) |
| */ |
| if (router->tq_avg > max_tq) { |
| if (curr_gw) |
| batadv_gw_node_free_ref(curr_gw); |
| curr_gw = gw_node; |
| atomic_inc(&curr_gw->refcount); |
| } |
| break; |
| } |
| |
| if (router->tq_avg > max_tq) |
| max_tq = router->tq_avg; |
| |
| if (tmp_gw_factor > max_gw_factor) |
| max_gw_factor = tmp_gw_factor; |
| |
| batadv_gw_node_free_ref(gw_node); |
| |
| next: |
| batadv_neigh_node_free_ref(router); |
| } |
| rcu_read_unlock(); |
| |
| return curr_gw; |
| } |
| |
| void batadv_gw_election(struct bat_priv *bat_priv) |
| { |
| struct gw_node *curr_gw = NULL, *next_gw = NULL; |
| struct neigh_node *router = NULL; |
| char gw_addr[18] = { '\0' }; |
| |
| /* The batman daemon checks here if we already passed a full originator |
| * cycle in order to make sure we don't choose the first gateway we |
| * hear about. This check is based on the daemon's uptime which we |
| * don't have. |
| */ |
| if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) |
| goto out; |
| |
| if (!batadv_atomic_dec_not_zero(&bat_priv->gw_reselect)) |
| goto out; |
| |
| curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
| |
| next_gw = batadv_gw_get_best_gw_node(bat_priv); |
| |
| if (curr_gw == next_gw) |
| goto out; |
| |
| if (next_gw) { |
| sprintf(gw_addr, "%pM", next_gw->orig_node->orig); |
| |
| router = batadv_orig_node_get_router(next_gw->orig_node); |
| if (!router) { |
| batadv_gw_deselect(bat_priv); |
| goto out; |
| } |
| } |
| |
| if ((curr_gw) && (!next_gw)) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Removing selected gateway - no gateway in range\n"); |
| batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, |
| NULL); |
| } else if ((!curr_gw) && (next_gw)) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Adding route to gateway %pM (gw_flags: %i, tq: %i)\n", |
| next_gw->orig_node->orig, |
| next_gw->orig_node->gw_flags, router->tq_avg); |
| batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD, |
| gw_addr); |
| } else { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Changing route to gateway %pM (gw_flags: %i, tq: %i)\n", |
| next_gw->orig_node->orig, |
| next_gw->orig_node->gw_flags, router->tq_avg); |
| batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE, |
| gw_addr); |
| } |
| |
| batadv_gw_select(bat_priv, next_gw); |
| |
| out: |
| if (curr_gw) |
| batadv_gw_node_free_ref(curr_gw); |
| if (next_gw) |
| batadv_gw_node_free_ref(next_gw); |
| if (router) |
| batadv_neigh_node_free_ref(router); |
| } |
| |
| void batadv_gw_check_election(struct bat_priv *bat_priv, |
| struct orig_node *orig_node) |
| { |
| struct orig_node *curr_gw_orig; |
| struct neigh_node *router_gw = NULL, *router_orig = NULL; |
| uint8_t gw_tq_avg, orig_tq_avg; |
| |
| curr_gw_orig = batadv_gw_get_selected_orig(bat_priv); |
| if (!curr_gw_orig) |
| goto deselect; |
| |
| router_gw = batadv_orig_node_get_router(curr_gw_orig); |
| if (!router_gw) |
| goto deselect; |
| |
| /* this node already is the gateway */ |
| if (curr_gw_orig == orig_node) |
| goto out; |
| |
| router_orig = batadv_orig_node_get_router(orig_node); |
| if (!router_orig) |
| goto out; |
| |
| gw_tq_avg = router_gw->tq_avg; |
| orig_tq_avg = router_orig->tq_avg; |
| |
| /* the TQ value has to be better */ |
| if (orig_tq_avg < gw_tq_avg) |
| goto out; |
| |
| /* if the routing class is greater than 3 the value tells us how much |
| * greater the TQ value of the new gateway must be |
| */ |
| if ((atomic_read(&bat_priv->gw_sel_class) > 3) && |
| (orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class))) |
| goto out; |
| |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n", |
| gw_tq_avg, orig_tq_avg); |
| |
| deselect: |
| batadv_gw_deselect(bat_priv); |
| out: |
| if (curr_gw_orig) |
| batadv_orig_node_free_ref(curr_gw_orig); |
| if (router_gw) |
| batadv_neigh_node_free_ref(router_gw); |
| if (router_orig) |
| batadv_neigh_node_free_ref(router_orig); |
| |
| return; |
| } |
| |
| static void batadv_gw_node_add(struct bat_priv *bat_priv, |
| struct orig_node *orig_node, |
| uint8_t new_gwflags) |
| { |
| struct gw_node *gw_node; |
| int down, up; |
| |
| gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); |
| if (!gw_node) |
| return; |
| |
| INIT_HLIST_NODE(&gw_node->list); |
| gw_node->orig_node = orig_node; |
| atomic_set(&gw_node->refcount, 1); |
| |
| spin_lock_bh(&bat_priv->gw_list_lock); |
| hlist_add_head_rcu(&gw_node->list, &bat_priv->gw_list); |
| spin_unlock_bh(&bat_priv->gw_list_lock); |
| |
| batadv_gw_bandwidth_to_kbit(new_gwflags, &down, &up); |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Found new gateway %pM -> gw_class: %i - %i%s/%i%s\n", |
| orig_node->orig, new_gwflags, |
| (down > 2048 ? down / 1024 : down), |
| (down > 2048 ? "MBit" : "KBit"), |
| (up > 2048 ? up / 1024 : up), |
| (up > 2048 ? "MBit" : "KBit")); |
| } |
| |
| void batadv_gw_node_update(struct bat_priv *bat_priv, |
| struct orig_node *orig_node, uint8_t new_gwflags) |
| { |
| struct hlist_node *node; |
| struct gw_node *gw_node, *curr_gw; |
| |
| /* Note: We don't need a NULL check here, since curr_gw never gets |
| * dereferenced. If curr_gw is NULL we also should not exit as we may |
| * have this gateway in our list (duplication check!) even though we |
| * have no currently selected gateway. |
| */ |
| curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { |
| if (gw_node->orig_node != orig_node) |
| continue; |
| |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Gateway class of originator %pM changed from %i to %i\n", |
| orig_node->orig, gw_node->orig_node->gw_flags, |
| new_gwflags); |
| |
| gw_node->deleted = 0; |
| |
| if (new_gwflags == BATADV_NO_FLAGS) { |
| gw_node->deleted = jiffies; |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Gateway %pM removed from gateway list\n", |
| orig_node->orig); |
| |
| if (gw_node == curr_gw) |
| goto deselect; |
| } |
| |
| goto unlock; |
| } |
| |
| if (new_gwflags == BATADV_NO_FLAGS) |
| goto unlock; |
| |
| batadv_gw_node_add(bat_priv, orig_node, new_gwflags); |
| goto unlock; |
| |
| deselect: |
| batadv_gw_deselect(bat_priv); |
| unlock: |
| rcu_read_unlock(); |
| |
| if (curr_gw) |
| batadv_gw_node_free_ref(curr_gw); |
| } |
| |
| void batadv_gw_node_delete(struct bat_priv *bat_priv, |
| struct orig_node *orig_node) |
| { |
| batadv_gw_node_update(bat_priv, orig_node, 0); |
| } |
| |
| void batadv_gw_node_purge(struct bat_priv *bat_priv) |
| { |
| struct gw_node *gw_node, *curr_gw; |
| struct hlist_node *node, *node_tmp; |
| unsigned long timeout = msecs_to_jiffies(2 * BATADV_PURGE_TIMEOUT); |
| int do_deselect = 0; |
| |
| curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
| |
| spin_lock_bh(&bat_priv->gw_list_lock); |
| |
| hlist_for_each_entry_safe(gw_node, node, node_tmp, |
| &bat_priv->gw_list, list) { |
| if (((!gw_node->deleted) || |
| (time_before(jiffies, gw_node->deleted + timeout))) && |
| atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) |
| continue; |
| |
| if (curr_gw == gw_node) |
| do_deselect = 1; |
| |
| hlist_del_rcu(&gw_node->list); |
| batadv_gw_node_free_ref(gw_node); |
| } |
| |
| spin_unlock_bh(&bat_priv->gw_list_lock); |
| |
| /* gw_deselect() needs to acquire the gw_list_lock */ |
| if (do_deselect) |
| batadv_gw_deselect(bat_priv); |
| |
| if (curr_gw) |
| batadv_gw_node_free_ref(curr_gw); |
| } |
| |
| /* fails if orig_node has no router */ |
| static int batadv_write_buffer_text(struct bat_priv *bat_priv, |
| struct seq_file *seq, |
| const struct gw_node *gw_node) |
| { |
| struct gw_node *curr_gw; |
| struct neigh_node *router; |
| int down, up, ret = -1; |
| |
| batadv_gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up); |
| |
| router = batadv_orig_node_get_router(gw_node->orig_node); |
| if (!router) |
| goto out; |
| |
| curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
| |
| ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n", |
| (curr_gw == gw_node ? "=>" : " "), |
| gw_node->orig_node->orig, |
| router->tq_avg, router->addr, |
| router->if_incoming->net_dev->name, |
| gw_node->orig_node->gw_flags, |
| (down > 2048 ? down / 1024 : down), |
| (down > 2048 ? "MBit" : "KBit"), |
| (up > 2048 ? up / 1024 : up), |
| (up > 2048 ? "MBit" : "KBit")); |
| |
| batadv_neigh_node_free_ref(router); |
| if (curr_gw) |
| batadv_gw_node_free_ref(curr_gw); |
| out: |
| return ret; |
| } |
| |
| int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) |
| { |
| struct net_device *net_dev = (struct net_device *)seq->private; |
| struct bat_priv *bat_priv = netdev_priv(net_dev); |
| struct hard_iface *primary_if; |
| struct gw_node *gw_node; |
| struct hlist_node *node; |
| int gw_count = 0, ret = 0; |
| |
| primary_if = batadv_primary_if_get_selected(bat_priv); |
| if (!primary_if) { |
| ret = seq_printf(seq, |
| "BATMAN mesh %s disabled - please specify interfaces to enable it\n", |
| net_dev->name); |
| goto out; |
| } |
| |
| if (primary_if->if_status != BATADV_IF_ACTIVE) { |
| ret = seq_printf(seq, |
| "BATMAN mesh %s disabled - primary interface not active\n", |
| net_dev->name); |
| goto out; |
| } |
| |
| seq_printf(seq, |
| " %-12s (%s/%i) %17s [%10s]: gw_class ... [B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s)]\n", |
| "Gateway", "#", BATADV_TQ_MAX_VALUE, "Nexthop", "outgoingIF", |
| BATADV_SOURCE_VERSION, primary_if->net_dev->name, |
| primary_if->net_dev->dev_addr, net_dev->name); |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) { |
| if (gw_node->deleted) |
| continue; |
| |
| /* fails if orig_node has no router */ |
| if (batadv_write_buffer_text(bat_priv, seq, gw_node) < 0) |
| continue; |
| |
| gw_count++; |
| } |
| rcu_read_unlock(); |
| |
| if (gw_count == 0) |
| seq_printf(seq, "No gateways in range ...\n"); |
| |
| out: |
| if (primary_if) |
| batadv_hardif_free_ref(primary_if); |
| return ret; |
| } |
| |
| static bool batadv_is_type_dhcprequest(struct sk_buff *skb, int header_len) |
| { |
| int ret = false; |
| unsigned char *p; |
| int pkt_len; |
| |
| if (skb_linearize(skb) < 0) |
| goto out; |
| |
| pkt_len = skb_headlen(skb); |
| |
| if (pkt_len < header_len + BATADV_DHCP_OPTIONS_OFFSET + 1) |
| goto out; |
| |
| p = skb->data + header_len + BATADV_DHCP_OPTIONS_OFFSET; |
| pkt_len -= header_len + BATADV_DHCP_OPTIONS_OFFSET + 1; |
| |
| /* Access the dhcp option lists. Each entry is made up by: |
| * - octet 1: option type |
| * - octet 2: option data len (only if type != 255 and 0) |
| * - octet 3: option data |
| */ |
| while (*p != 255 && !ret) { |
| /* p now points to the first octet: option type */ |
| if (*p == 53) { |
| /* type 53 is the message type option. |
| * Jump the len octet and go to the data octet |
| */ |
| if (pkt_len < 2) |
| goto out; |
| p += 2; |
| |
| /* check if the message type is what we need */ |
| if (*p == BATADV_DHCP_REQUEST) |
| ret = true; |
| break; |
| } else if (*p == 0) { |
| /* option type 0 (padding), just go forward */ |
| if (pkt_len < 1) |
| goto out; |
| pkt_len--; |
| p++; |
| } else { |
| /* This is any other option. So we get the length... */ |
| if (pkt_len < 1) |
| goto out; |
| pkt_len--; |
| p++; |
| |
| /* ...and then we jump over the data */ |
| if (pkt_len < 1 + (*p)) |
| goto out; |
| pkt_len -= 1 + (*p); |
| p += 1 + (*p); |
| } |
| } |
| out: |
| return ret; |
| } |
| |
| bool batadv_gw_is_dhcp_target(struct sk_buff *skb, unsigned int *header_len) |
| { |
| struct ethhdr *ethhdr; |
| struct iphdr *iphdr; |
| struct ipv6hdr *ipv6hdr; |
| struct udphdr *udphdr; |
| |
| /* check for ethernet header */ |
| if (!pskb_may_pull(skb, *header_len + ETH_HLEN)) |
| return false; |
| ethhdr = (struct ethhdr *)skb->data; |
| *header_len += ETH_HLEN; |
| |
| /* check for initial vlan header */ |
| if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) { |
| if (!pskb_may_pull(skb, *header_len + VLAN_HLEN)) |
| return false; |
| ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN); |
| *header_len += VLAN_HLEN; |
| } |
| |
| /* check for ip header */ |
| switch (ntohs(ethhdr->h_proto)) { |
| case ETH_P_IP: |
| if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr))) |
| return false; |
| iphdr = (struct iphdr *)(skb->data + *header_len); |
| *header_len += iphdr->ihl * 4; |
| |
| /* check for udp header */ |
| if (iphdr->protocol != IPPROTO_UDP) |
| return false; |
| |
| break; |
| case ETH_P_IPV6: |
| if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr))) |
| return false; |
| ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len); |
| *header_len += sizeof(*ipv6hdr); |
| |
| /* check for udp header */ |
| if (ipv6hdr->nexthdr != IPPROTO_UDP) |
| return false; |
| |
| break; |
| default: |
| return false; |
| } |
| |
| if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr))) |
| return false; |
| udphdr = (struct udphdr *)(skb->data + *header_len); |
| *header_len += sizeof(*udphdr); |
| |
| /* check for bootp port */ |
| if ((ntohs(ethhdr->h_proto) == ETH_P_IP) && |
| (ntohs(udphdr->dest) != 67)) |
| return false; |
| |
| if ((ntohs(ethhdr->h_proto) == ETH_P_IPV6) && |
| (ntohs(udphdr->dest) != 547)) |
| return false; |
| |
| return true; |
| } |
| |
| bool batadv_gw_out_of_range(struct bat_priv *bat_priv, |
| struct sk_buff *skb, struct ethhdr *ethhdr) |
| { |
| struct neigh_node *neigh_curr = NULL, *neigh_old = NULL; |
| struct orig_node *orig_dst_node = NULL; |
| struct gw_node *curr_gw = NULL; |
| bool ret, out_of_range = false; |
| unsigned int header_len = 0; |
| uint8_t curr_tq_avg; |
| |
| ret = batadv_gw_is_dhcp_target(skb, &header_len); |
| if (!ret) |
| goto out; |
| |
| orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source, |
| ethhdr->h_dest); |
| if (!orig_dst_node) |
| goto out; |
| |
| if (!orig_dst_node->gw_flags) |
| goto out; |
| |
| ret = batadv_is_type_dhcprequest(skb, header_len); |
| if (!ret) |
| goto out; |
| |
| switch (atomic_read(&bat_priv->gw_mode)) { |
| case BATADV_GW_MODE_SERVER: |
| /* If we are a GW then we are our best GW. We can artificially |
| * set the tq towards ourself as the maximum value |
| */ |
| curr_tq_avg = BATADV_TQ_MAX_VALUE; |
| break; |
| case BATADV_GW_MODE_CLIENT: |
| curr_gw = batadv_gw_get_selected_gw_node(bat_priv); |
| if (!curr_gw) |
| goto out; |
| |
| /* packet is going to our gateway */ |
| if (curr_gw->orig_node == orig_dst_node) |
| goto out; |
| |
| /* If the dhcp packet has been sent to a different gw, |
| * we have to evaluate whether the old gw is still |
| * reliable enough |
| */ |
| neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node, |
| NULL); |
| if (!neigh_curr) |
| goto out; |
| |
| curr_tq_avg = neigh_curr->tq_avg; |
| break; |
| case BATADV_GW_MODE_OFF: |
| default: |
| goto out; |
| } |
| |
| neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL); |
| if (!neigh_old) |
| goto out; |
| |
| if (curr_tq_avg - neigh_old->tq_avg > BATADV_GW_THRESHOLD) |
| out_of_range = true; |
| |
| out: |
| if (orig_dst_node) |
| batadv_orig_node_free_ref(orig_dst_node); |
| if (curr_gw) |
| batadv_gw_node_free_ref(curr_gw); |
| if (neigh_old) |
| batadv_neigh_node_free_ref(neigh_old); |
| if (neigh_curr) |
| batadv_neigh_node_free_ref(neigh_curr); |
| return out_of_range; |
| } |