zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/net/batman-adv/gateway_client.c b/ap/os/linux/linux-3.4.x/net/batman-adv/gateway_client.c
new file mode 100644
index 0000000..6f9b9b7
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/batman-adv/gateway_client.c
@@ -0,0 +1,709 @@
+/*
+ * 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 DHCP_OPTIONS_OFFSET 240
+#define DHCP_REQUEST 3
+
+static void 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 *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 *gw_get_selected_orig(struct bat_priv *bat_priv)
+{
+ struct gw_node *gw_node;
+ struct orig_node *orig_node = NULL;
+
+ gw_node = 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)
+ gw_node_free_ref(gw_node);
+ return orig_node;
+}
+
+static void 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)
+ gw_node_free_ref(curr_gw_node);
+
+ spin_unlock_bh(&bat_priv->gw_list_lock);
+}
+
+void gw_deselect(struct bat_priv *bat_priv)
+{
+ atomic_set(&bat_priv->gw_reselect, 1);
+}
+
+static struct gw_node *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;
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
+ if (gw_node->deleted)
+ continue;
+
+ router = orig_node_get_router(gw_node->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 */
+ gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags,
+ &down, &up);
+
+ tmp_gw_factor = (router->tq_avg * router->tq_avg *
+ down * 100 * 100) /
+ (TQ_LOCAL_WINDOW_SIZE *
+ 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)
+ 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)
+ 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;
+
+ gw_node_free_ref(gw_node);
+
+next:
+ neigh_node_free_ref(router);
+ }
+ rcu_read_unlock();
+
+ return curr_gw;
+}
+
+void 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) != GW_MODE_CLIENT)
+ goto out;
+
+ if (!atomic_dec_not_zero(&bat_priv->gw_reselect))
+ goto out;
+
+ curr_gw = gw_get_selected_gw_node(bat_priv);
+
+ next_gw = 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 = orig_node_get_router(next_gw->orig_node);
+ if (!router) {
+ gw_deselect(bat_priv);
+ goto out;
+ }
+ }
+
+ if ((curr_gw) && (!next_gw)) {
+ bat_dbg(DBG_BATMAN, bat_priv,
+ "Removing selected gateway - no gateway in range\n");
+ throw_uevent(bat_priv, UEV_GW, UEV_DEL, NULL);
+ } else if ((!curr_gw) && (next_gw)) {
+ bat_dbg(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);
+ throw_uevent(bat_priv, UEV_GW, UEV_ADD, gw_addr);
+ } else {
+ bat_dbg(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);
+ throw_uevent(bat_priv, UEV_GW, UEV_CHANGE, gw_addr);
+ }
+
+ gw_select(bat_priv, next_gw);
+
+out:
+ if (curr_gw)
+ gw_node_free_ref(curr_gw);
+ if (next_gw)
+ gw_node_free_ref(next_gw);
+ if (router)
+ neigh_node_free_ref(router);
+}
+
+void 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 = gw_get_selected_orig(bat_priv);
+ if (!curr_gw_orig)
+ goto deselect;
+
+ router_gw = 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 = 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;
+
+ bat_dbg(DBG_BATMAN, bat_priv,
+ "Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n",
+ gw_tq_avg, orig_tq_avg);
+
+deselect:
+ gw_deselect(bat_priv);
+out:
+ if (curr_gw_orig)
+ orig_node_free_ref(curr_gw_orig);
+ if (router_gw)
+ neigh_node_free_ref(router_gw);
+ if (router_orig)
+ neigh_node_free_ref(router_orig);
+
+ return;
+}
+
+static void 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);
+
+ gw_bandwidth_to_kbit(new_gwflags, &down, &up);
+ bat_dbg(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 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 = 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;
+
+ bat_dbg(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 == NO_FLAGS) {
+ gw_node->deleted = jiffies;
+ bat_dbg(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 == NO_FLAGS)
+ goto unlock;
+
+ gw_node_add(bat_priv, orig_node, new_gwflags);
+ goto unlock;
+
+deselect:
+ gw_deselect(bat_priv);
+unlock:
+ rcu_read_unlock();
+
+ if (curr_gw)
+ gw_node_free_ref(curr_gw);
+}
+
+void gw_node_delete(struct bat_priv *bat_priv, struct orig_node *orig_node)
+{
+ gw_node_update(bat_priv, orig_node, 0);
+}
+
+void 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 * PURGE_TIMEOUT);
+ int do_deselect = 0;
+
+ curr_gw = 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) == MESH_ACTIVE)
+ continue;
+
+ if (curr_gw == gw_node)
+ do_deselect = 1;
+
+ hlist_del_rcu(&gw_node->list);
+ 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)
+ gw_deselect(bat_priv);
+
+ if (curr_gw)
+ gw_node_free_ref(curr_gw);
+}
+
+/**
+ * fails if orig_node has no router
+ */
+static int _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;
+
+ gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up);
+
+ router = orig_node_get_router(gw_node->orig_node);
+ if (!router)
+ goto out;
+
+ curr_gw = 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"));
+
+ neigh_node_free_ref(router);
+ if (curr_gw)
+ gw_node_free_ref(curr_gw);
+out:
+ return ret;
+}
+
+int 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 = 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 != 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", "#", TQ_MAX_VALUE, "Nexthop", "outgoingIF",
+ 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 (_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)
+ hardif_free_ref(primary_if);
+ return ret;
+}
+
+static bool 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 + DHCP_OPTIONS_OFFSET + 1)
+ goto out;
+
+ p = skb->data + header_len + DHCP_OPTIONS_OFFSET;
+ pkt_len -= header_len + 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 == 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 < *p)
+ goto out;
+ pkt_len -= *p;
+ p += (*p);
+ }
+ }
+out:
+ return ret;
+}
+
+bool 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 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 = gw_is_dhcp_target(skb, &header_len);
+ if (!ret)
+ goto out;
+
+ orig_dst_node = 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 = is_type_dhcprequest(skb, header_len);
+ if (!ret)
+ goto out;
+
+ switch (atomic_read(&bat_priv->gw_mode)) {
+ case 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 = TQ_MAX_VALUE;
+ break;
+ case GW_MODE_CLIENT:
+ curr_gw = 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 = find_router(bat_priv, curr_gw->orig_node, NULL);
+ if (!neigh_curr)
+ goto out;
+
+ curr_tq_avg = neigh_curr->tq_avg;
+ break;
+ case GW_MODE_OFF:
+ default:
+ goto out;
+ }
+
+ neigh_old = find_router(bat_priv, orig_dst_node, NULL);
+ if (!neigh_old)
+ goto out;
+
+ if (curr_tq_avg - neigh_old->tq_avg > GW_THRESHOLD)
+ out_of_range = true;
+
+out:
+ if (orig_dst_node)
+ orig_node_free_ref(orig_dst_node);
+ if (curr_gw)
+ gw_node_free_ref(curr_gw);
+ if (neigh_old)
+ neigh_node_free_ref(neigh_old);
+ if (neigh_curr)
+ neigh_node_free_ref(neigh_curr);
+ return out_of_range;
+}