batman-adv: Make orig_node->router an rcu protected pointer
The rcu protected macros rcu_dereference() and rcu_assign_pointer() for the orig_node->router need to be used, as well as spin/rcu locking. Otherwise we might end up using a router pointer pointing to already freed memory. Therefore this commit introduces the safe getter method orig_node_get_router(). Signed-off-by: Linus Lüssing <linus.luessing@web.de> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Sven Eckelmann <sven@narfation.org>
This commit is contained in:
Linus Lüssing
Sven Eckelmann
parent
57f0c07c4d
commit
e1a5382f97
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@ -98,6 +98,7 @@ void gw_election(struct bat_priv *bat_priv)
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{
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struct hlist_node *node;
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struct gw_node *gw_node, *curr_gw, *curr_gw_tmp = NULL;
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struct neigh_node *router;
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uint8_t max_tq = 0;
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uint32_t max_gw_factor = 0, tmp_gw_factor = 0;
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int down, up;
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@ -133,10 +134,11 @@ void gw_election(struct bat_priv *bat_priv)
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}
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hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
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if (!gw_node->orig_node->router)
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if (gw_node->deleted)
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continue;
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if (gw_node->deleted)
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router = orig_node_get_router(gw_node->orig_node);
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if (!router)
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continue;
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switch (atomic_read(&bat_priv->gw_sel_class)) {
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@ -144,15 +146,14 @@ void gw_election(struct bat_priv *bat_priv)
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gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags,
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&down, &up);
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tmp_gw_factor = (gw_node->orig_node->router->tq_avg *
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gw_node->orig_node->router->tq_avg *
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tmp_gw_factor = (router->tq_avg * router->tq_avg *
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down * 100 * 100) /
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(TQ_LOCAL_WINDOW_SIZE *
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TQ_LOCAL_WINDOW_SIZE * 64);
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if ((tmp_gw_factor > max_gw_factor) ||
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((tmp_gw_factor == max_gw_factor) &&
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(gw_node->orig_node->router->tq_avg > max_tq)))
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(router->tq_avg > max_tq)))
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curr_gw_tmp = gw_node;
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break;
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@ -164,19 +165,25 @@ void gw_election(struct bat_priv *bat_priv)
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* soon as a better gateway appears which has
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* $routing_class more tq points)
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**/
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if (gw_node->orig_node->router->tq_avg > max_tq)
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if (router->tq_avg > max_tq)
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curr_gw_tmp = gw_node;
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break;
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}
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if (gw_node->orig_node->router->tq_avg > max_tq)
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max_tq = gw_node->orig_node->router->tq_avg;
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if (router->tq_avg > max_tq)
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max_tq = router->tq_avg;
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if (tmp_gw_factor > max_gw_factor)
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max_gw_factor = tmp_gw_factor;
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neigh_node_free_ref(router);
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}
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if (curr_gw != curr_gw_tmp) {
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router = orig_node_get_router(curr_gw_tmp->orig_node);
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if (!router)
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goto out;
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if ((curr_gw) && (!curr_gw_tmp))
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bat_dbg(DBG_BATMAN, bat_priv,
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"Removing selected gateway - "
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@ -187,45 +194,47 @@ void gw_election(struct bat_priv *bat_priv)
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"(gw_flags: %i, tq: %i)\n",
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curr_gw_tmp->orig_node->orig,
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curr_gw_tmp->orig_node->gw_flags,
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curr_gw_tmp->orig_node->router->tq_avg);
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router->tq_avg);
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else
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bat_dbg(DBG_BATMAN, bat_priv,
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"Changing route to gateway %pM "
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"(gw_flags: %i, tq: %i)\n",
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curr_gw_tmp->orig_node->orig,
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curr_gw_tmp->orig_node->gw_flags,
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curr_gw_tmp->orig_node->router->tq_avg);
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router->tq_avg);
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neigh_node_free_ref(router);
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gw_select(bat_priv, curr_gw_tmp);
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}
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out:
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rcu_read_unlock();
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}
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void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node)
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{
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struct orig_node *curr_gw_orig;
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struct neigh_node *router_gw = NULL, *router_orig = NULL;
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uint8_t gw_tq_avg, orig_tq_avg;
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curr_gw_orig = gw_get_selected(bat_priv);
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if (!curr_gw_orig)
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goto deselect;
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rcu_read_lock();
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if (!curr_gw_orig->router)
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goto deselect_rcu;
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router_gw = orig_node_get_router(curr_gw_orig);
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if (!router_gw)
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goto deselect;
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/* this node already is the gateway */
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if (curr_gw_orig == orig_node)
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goto out_rcu;
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goto out;
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if (!orig_node->router)
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goto out_rcu;
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router_orig = orig_node_get_router(orig_node);
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if (!router_orig)
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goto out;
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gw_tq_avg = curr_gw_orig->router->tq_avg;
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rcu_read_unlock();
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orig_tq_avg = orig_node->router->tq_avg;
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gw_tq_avg = router_gw->tq_avg;
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orig_tq_avg = router_orig->tq_avg;
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/* the TQ value has to be better */
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if (orig_tq_avg < gw_tq_avg)
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@ -243,18 +252,16 @@ void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node)
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"Restarting gateway selection: better gateway found (tq curr: "
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"%i, tq new: %i)\n",
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gw_tq_avg, orig_tq_avg);
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goto deselect;
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out_rcu:
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rcu_read_unlock();
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goto out;
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deselect_rcu:
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rcu_read_unlock();
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deselect:
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gw_deselect(bat_priv);
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out:
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if (curr_gw_orig)
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orig_node_free_ref(curr_gw_orig);
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if (router_gw)
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neigh_node_free_ref(router_gw);
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if (router_orig)
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neigh_node_free_ref(router_orig);
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return;
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}
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@ -362,23 +369,30 @@ void gw_node_purge(struct bat_priv *bat_priv)
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spin_unlock_bh(&bat_priv->gw_list_lock);
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}
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/**
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* fails if orig_node has no router
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*/
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static int _write_buffer_text(struct bat_priv *bat_priv,
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struct seq_file *seq, struct gw_node *gw_node)
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{
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struct gw_node *curr_gw;
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int down, up, ret;
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struct neigh_node *router;
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int down, up, ret = -1;
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gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up);
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router = orig_node_get_router(gw_node->orig_node);
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if (!router)
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goto out;
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rcu_read_lock();
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curr_gw = rcu_dereference(bat_priv->curr_gw);
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ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n",
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(curr_gw == gw_node ? "=>" : " "),
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gw_node->orig_node->orig,
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gw_node->orig_node->router->tq_avg,
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gw_node->orig_node->router->addr,
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gw_node->orig_node->router->if_incoming->net_dev->name,
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router->tq_avg, router->addr,
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router->if_incoming->net_dev->name,
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gw_node->orig_node->gw_flags,
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(down > 2048 ? down / 1024 : down),
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(down > 2048 ? "MBit" : "KBit"),
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@ -386,6 +400,8 @@ static int _write_buffer_text(struct bat_priv *bat_priv,
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(up > 2048 ? "MBit" : "KBit"));
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rcu_read_unlock();
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neigh_node_free_ref(router);
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out:
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return ret;
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}
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@ -423,10 +439,10 @@ int gw_client_seq_print_text(struct seq_file *seq, void *offset)
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if (gw_node->deleted)
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continue;
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if (!gw_node->orig_node->router)
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/* fails if orig_node has no router */
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if (_write_buffer_text(bat_priv, seq, gw_node) < 0)
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continue;
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_write_buffer_text(bat_priv, seq, gw_node);
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gw_count++;
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}
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rcu_read_unlock();
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@ -218,23 +218,13 @@ static ssize_t bat_socket_write(struct file *file, const char __user *buff,
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if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
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goto dst_unreach;
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rcu_read_lock();
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orig_node = orig_hash_find(bat_priv, icmp_packet->dst);
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if (!orig_node)
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goto unlock;
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neigh_node = orig_node->router;
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goto dst_unreach;
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neigh_node = orig_node_get_router(orig_node);
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if (!neigh_node)
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goto unlock;
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if (!atomic_inc_not_zero(&neigh_node->refcount)) {
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neigh_node = NULL;
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goto unlock;
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}
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rcu_read_unlock();
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goto dst_unreach;
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if (!neigh_node->if_incoming)
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goto dst_unreach;
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@ -252,8 +242,6 @@ static ssize_t bat_socket_write(struct file *file, const char __user *buff,
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send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
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goto out;
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unlock:
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rcu_read_unlock();
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dst_unreach:
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icmp_packet->msg_type = DESTINATION_UNREACHABLE;
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bat_socket_add_packet(socket_client, icmp_packet, packet_len);
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@ -70,6 +70,21 @@ void neigh_node_free_ref(struct neigh_node *neigh_node)
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call_rcu(&neigh_node->rcu, neigh_node_free_rcu);
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}
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/* increases the refcounter of a found router */
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struct neigh_node *orig_node_get_router(struct orig_node *orig_node)
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{
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struct neigh_node *router;
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rcu_read_lock();
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router = rcu_dereference(orig_node->router);
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if (router && !atomic_inc_not_zero(&router->refcount))
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router = NULL;
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rcu_read_unlock();
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return router;
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}
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struct neigh_node *create_neighbor(struct orig_node *orig_node,
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struct orig_node *orig_neigh_node,
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uint8_t *neigh,
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@ -390,7 +405,7 @@ int orig_seq_print_text(struct seq_file *seq, void *offset)
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struct hlist_node *node, *node_tmp;
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struct hlist_head *head;
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struct orig_node *orig_node;
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struct neigh_node *neigh_node;
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struct neigh_node *neigh_node, *neigh_node_tmp;
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int batman_count = 0;
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int last_seen_secs;
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int last_seen_msecs;
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@ -421,37 +436,41 @@ int orig_seq_print_text(struct seq_file *seq, void *offset)
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rcu_read_lock();
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hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
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if (!orig_node->router)
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neigh_node = orig_node_get_router(orig_node);
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if (!neigh_node)
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continue;
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if (orig_node->router->tq_avg == 0)
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continue;
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if (neigh_node->tq_avg == 0)
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goto next;
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last_seen_secs = jiffies_to_msecs(jiffies -
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orig_node->last_valid) / 1000;
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last_seen_msecs = jiffies_to_msecs(jiffies -
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orig_node->last_valid) % 1000;
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neigh_node = orig_node->router;
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seq_printf(seq, "%pM %4i.%03is (%3i) %pM [%10s]:",
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orig_node->orig, last_seen_secs,
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last_seen_msecs, neigh_node->tq_avg,
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neigh_node->addr,
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neigh_node->if_incoming->net_dev->name);
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hlist_for_each_entry_rcu(neigh_node, node_tmp,
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hlist_for_each_entry_rcu(neigh_node_tmp, node_tmp,
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&orig_node->neigh_list, list) {
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seq_printf(seq, " %pM (%3i)", neigh_node->addr,
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neigh_node->tq_avg);
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seq_printf(seq, " %pM (%3i)",
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neigh_node_tmp->addr,
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neigh_node_tmp->tq_avg);
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}
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seq_printf(seq, "\n");
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batman_count++;
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next:
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neigh_node_free_ref(neigh_node);
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}
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rcu_read_unlock();
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}
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if ((batman_count == 0))
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if (batman_count == 0)
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seq_printf(seq, "No batman nodes in range ...\n");
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return 0;
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@ -34,6 +34,7 @@ struct neigh_node *create_neighbor(struct orig_node *orig_node,
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uint8_t *neigh,
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struct hard_iface *if_incoming);
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void neigh_node_free_ref(struct neigh_node *neigh_node);
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struct neigh_node *orig_node_get_router(struct orig_node *orig_node);
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int orig_seq_print_text(struct seq_file *seq, void *offset);
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int orig_hash_add_if(struct hard_iface *hard_iface, int max_if_num);
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int orig_hash_del_if(struct hard_iface *hard_iface, int max_if_num);
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@ -87,10 +87,12 @@ static void update_route(struct bat_priv *bat_priv,
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struct neigh_node *neigh_node,
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unsigned char *hna_buff, int hna_buff_len)
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{
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struct neigh_node *neigh_node_tmp;
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struct neigh_node *curr_router;
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curr_router = orig_node_get_router(orig_node);
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/* route deleted */
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if ((orig_node->router) && (!neigh_node)) {
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if ((curr_router) && (!neigh_node)) {
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bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n",
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orig_node->orig);
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@ -98,7 +100,7 @@ static void update_route(struct bat_priv *bat_priv,
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"originator timed out");
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/* route added */
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} else if ((!orig_node->router) && (neigh_node)) {
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} else if ((!curr_router) && (neigh_node)) {
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bat_dbg(DBG_ROUTES, bat_priv,
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"Adding route towards: %pM (via %pM)\n",
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@ -112,15 +114,23 @@ static void update_route(struct bat_priv *bat_priv,
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"Changing route towards: %pM "
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"(now via %pM - was via %pM)\n",
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orig_node->orig, neigh_node->addr,
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orig_node->router->addr);
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curr_router->addr);
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}
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if (curr_router)
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neigh_node_free_ref(curr_router);
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/* increase refcount of new best neighbor */
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if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount))
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neigh_node = NULL;
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neigh_node_tmp = orig_node->router;
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orig_node->router = neigh_node;
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if (neigh_node_tmp)
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neigh_node_free_ref(neigh_node_tmp);
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spin_lock_bh(&orig_node->neigh_list_lock);
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rcu_assign_pointer(orig_node->router, neigh_node);
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spin_unlock_bh(&orig_node->neigh_list_lock);
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/* decrease refcount of previous best neighbor */
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if (curr_router)
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neigh_node_free_ref(curr_router);
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}
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@ -128,16 +138,23 @@ void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node,
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struct neigh_node *neigh_node, unsigned char *hna_buff,
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int hna_buff_len)
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{
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struct neigh_node *router = NULL;
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if (!orig_node)
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return;
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goto out;
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if (orig_node->router != neigh_node)
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router = orig_node_get_router(orig_node);
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if (router != neigh_node)
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update_route(bat_priv, orig_node, neigh_node,
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hna_buff, hna_buff_len);
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/* may be just HNA changed */
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else
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update_HNA(bat_priv, orig_node, hna_buff, hna_buff_len);
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out:
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if (router)
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neigh_node_free_ref(router);
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}
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static int is_bidirectional_neigh(struct orig_node *orig_node,
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@ -288,8 +305,8 @@ static void bonding_candidate_add(struct orig_node *orig_node,
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struct neigh_node *neigh_node)
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{
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struct hlist_node *node;
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struct neigh_node *tmp_neigh_node;
|
||||
uint8_t best_tq, interference_candidate = 0;
|
||||
struct neigh_node *tmp_neigh_node, *router = NULL;
|
||||
uint8_t interference_candidate = 0;
|
||||
|
||||
spin_lock_bh(&orig_node->neigh_list_lock);
|
||||
|
||||
|
|
@ -298,13 +315,12 @@ static void bonding_candidate_add(struct orig_node *orig_node,
|
|||
neigh_node->orig_node->primary_addr))
|
||||
goto candidate_del;
|
||||
|
||||
if (!orig_node->router)
|
||||
router = orig_node_get_router(orig_node);
|
||||
if (!router)
|
||||
goto candidate_del;
|
||||
|
||||
best_tq = orig_node->router->tq_avg;
|
||||
|
||||
/* ... and is good enough to be considered */
|
||||
if (neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD)
|
||||
if (neigh_node->tq_avg < router->tq_avg - BONDING_TQ_THRESHOLD)
|
||||
goto candidate_del;
|
||||
|
||||
/**
|
||||
|
|
@ -350,7 +366,9 @@ candidate_del:
|
|||
|
||||
out:
|
||||
spin_unlock_bh(&orig_node->neigh_list_lock);
|
||||
return;
|
||||
|
||||
if (router)
|
||||
neigh_node_free_ref(router);
|
||||
}
|
||||
|
||||
/* copy primary address for bonding */
|
||||
|
|
@ -373,6 +391,7 @@ static void update_orig(struct bat_priv *bat_priv,
|
|||
char is_duplicate)
|
||||
{
|
||||
struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
|
||||
struct neigh_node *router = NULL;
|
||||
struct orig_node *orig_node_tmp;
|
||||
struct hlist_node *node;
|
||||
int tmp_hna_buff_len;
|
||||
|
|
@ -441,19 +460,18 @@ static void update_orig(struct bat_priv *bat_priv,
|
|||
|
||||
/* if this neighbor already is our next hop there is nothing
|
||||
* to change */
|
||||
if (orig_node->router == neigh_node)
|
||||
router = orig_node_get_router(orig_node);
|
||||
if (router == neigh_node)
|
||||
goto update_hna;
|
||||
|
||||
/* if this neighbor does not offer a better TQ we won't consider it */
|
||||
if ((orig_node->router) &&
|
||||
(orig_node->router->tq_avg > neigh_node->tq_avg))
|
||||
if (router && (router->tq_avg > neigh_node->tq_avg))
|
||||
goto update_hna;
|
||||
|
||||
/* if the TQ is the same and the link not more symetric we
|
||||
* won't consider it either */
|
||||
if ((orig_node->router) &&
|
||||
(neigh_node->tq_avg == orig_node->router->tq_avg)) {
|
||||
orig_node_tmp = orig_node->router->orig_node;
|
||||
if (router && (neigh_node->tq_avg == router->tq_avg)) {
|
||||
orig_node_tmp = router->orig_node;
|
||||
spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
|
||||
bcast_own_sum_orig =
|
||||
orig_node_tmp->bcast_own_sum[if_incoming->if_num];
|
||||
|
|
@ -474,7 +492,7 @@ static void update_orig(struct bat_priv *bat_priv,
|
|||
goto update_gw;
|
||||
|
||||
update_hna:
|
||||
update_routes(bat_priv, orig_node, orig_node->router,
|
||||
update_routes(bat_priv, orig_node, router,
|
||||
hna_buff, tmp_hna_buff_len);
|
||||
|
||||
update_gw:
|
||||
|
|
@ -496,6 +514,8 @@ unlock:
|
|||
out:
|
||||
if (neigh_node)
|
||||
neigh_node_free_ref(neigh_node);
|
||||
if (router)
|
||||
neigh_node_free_ref(router);
|
||||
}
|
||||
|
||||
/* checks whether the host restarted and is in the protection time.
|
||||
|
|
@ -603,6 +623,8 @@ void receive_bat_packet(struct ethhdr *ethhdr,
|
|||
struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
|
||||
struct hard_iface *hard_iface;
|
||||
struct orig_node *orig_neigh_node, *orig_node;
|
||||
struct neigh_node *router = NULL, *router_router = NULL;
|
||||
struct neigh_node *orig_neigh_router = NULL;
|
||||
char has_directlink_flag;
|
||||
char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
|
||||
char is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
|
||||
|
|
@ -747,14 +769,15 @@ void receive_bat_packet(struct ethhdr *ethhdr,
|
|||
goto out;
|
||||
}
|
||||
|
||||
router = orig_node_get_router(orig_node);
|
||||
if (router)
|
||||
router_router = orig_node_get_router(router->orig_node);
|
||||
|
||||
/* avoid temporary routing loops */
|
||||
if ((orig_node->router) &&
|
||||
(orig_node->router->orig_node->router) &&
|
||||
(compare_eth(orig_node->router->addr,
|
||||
batman_packet->prev_sender)) &&
|
||||
if (router && router_router &&
|
||||
(compare_eth(router->addr, batman_packet->prev_sender)) &&
|
||||
!(compare_eth(batman_packet->orig, batman_packet->prev_sender)) &&
|
||||
(compare_eth(orig_node->router->addr,
|
||||
orig_node->router->orig_node->router->addr))) {
|
||||
(compare_eth(router->addr, router_router->addr))) {
|
||||
bat_dbg(DBG_BATMAN, bat_priv,
|
||||
"Drop packet: ignoring all rebroadcast packets that "
|
||||
"may make me loop (sender: %pM)\n", ethhdr->h_source);
|
||||
|
|
@ -769,9 +792,11 @@ void receive_bat_packet(struct ethhdr *ethhdr,
|
|||
if (!orig_neigh_node)
|
||||
goto out;
|
||||
|
||||
orig_neigh_router = orig_node_get_router(orig_neigh_node);
|
||||
|
||||
/* drop packet if sender is not a direct neighbor and if we
|
||||
* don't route towards it */
|
||||
if (!is_single_hop_neigh && (!orig_neigh_node->router)) {
|
||||
if (!is_single_hop_neigh && (!orig_neigh_router)) {
|
||||
bat_dbg(DBG_BATMAN, bat_priv,
|
||||
"Drop packet: OGM via unknown neighbor!\n");
|
||||
goto out_neigh;
|
||||
|
|
@ -825,6 +850,13 @@ out_neigh:
|
|||
if ((orig_neigh_node) && (!is_single_hop_neigh))
|
||||
orig_node_free_ref(orig_neigh_node);
|
||||
out:
|
||||
if (router)
|
||||
neigh_node_free_ref(router);
|
||||
if (router_router)
|
||||
neigh_node_free_ref(router_router);
|
||||
if (orig_neigh_router)
|
||||
neigh_node_free_ref(orig_neigh_router);
|
||||
|
||||
orig_node_free_ref(orig_node);
|
||||
}
|
||||
|
||||
|
|
@ -869,7 +901,7 @@ static int recv_my_icmp_packet(struct bat_priv *bat_priv,
|
|||
struct sk_buff *skb, size_t icmp_len)
|
||||
{
|
||||
struct orig_node *orig_node = NULL;
|
||||
struct neigh_node *neigh_node = NULL;
|
||||
struct neigh_node *router = NULL;
|
||||
struct icmp_packet_rr *icmp_packet;
|
||||
int ret = NET_RX_DROP;
|
||||
|
||||
|
|
@ -886,23 +918,13 @@ static int recv_my_icmp_packet(struct bat_priv *bat_priv,
|
|||
|
||||
/* answer echo request (ping) */
|
||||
/* get routing information */
|
||||
rcu_read_lock();
|
||||
orig_node = orig_hash_find(bat_priv, icmp_packet->orig);
|
||||
|
||||
if (!orig_node)
|
||||
goto unlock;
|
||||
goto out;
|
||||
|
||||
neigh_node = orig_node->router;
|
||||
|
||||
if (!neigh_node)
|
||||
goto unlock;
|
||||
|
||||
if (!atomic_inc_not_zero(&neigh_node->refcount)) {
|
||||
neigh_node = NULL;
|
||||
goto unlock;
|
||||
}
|
||||
|
||||
rcu_read_unlock();
|
||||
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)
|
||||
|
|
@ -916,15 +938,12 @@ static int recv_my_icmp_packet(struct bat_priv *bat_priv,
|
|||
icmp_packet->msg_type = ECHO_REPLY;
|
||||
icmp_packet->ttl = TTL;
|
||||
|
||||
send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
|
||||
send_skb_packet(skb, router->if_incoming, router->addr);
|
||||
ret = NET_RX_SUCCESS;
|
||||
goto out;
|
||||
|
||||
unlock:
|
||||
rcu_read_unlock();
|
||||
out:
|
||||
if (neigh_node)
|
||||
neigh_node_free_ref(neigh_node);
|
||||
if (router)
|
||||
neigh_node_free_ref(router);
|
||||
if (orig_node)
|
||||
orig_node_free_ref(orig_node);
|
||||
return ret;
|
||||
|
|
@ -934,7 +953,7 @@ static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
|
|||
struct sk_buff *skb)
|
||||
{
|
||||
struct orig_node *orig_node = NULL;
|
||||
struct neigh_node *neigh_node = NULL;
|
||||
struct neigh_node *router = NULL;
|
||||
struct icmp_packet *icmp_packet;
|
||||
int ret = NET_RX_DROP;
|
||||
|
||||
|
|
@ -952,23 +971,13 @@ static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
|
|||
goto out;
|
||||
|
||||
/* get routing information */
|
||||
rcu_read_lock();
|
||||
orig_node = orig_hash_find(bat_priv, icmp_packet->orig);
|
||||
|
||||
if (!orig_node)
|
||||
goto unlock;
|
||||
goto out;
|
||||
|
||||
neigh_node = orig_node->router;
|
||||
|
||||
if (!neigh_node)
|
||||
goto unlock;
|
||||
|
||||
if (!atomic_inc_not_zero(&neigh_node->refcount)) {
|
||||
neigh_node = NULL;
|
||||
goto unlock;
|
||||
}
|
||||
|
||||
rcu_read_unlock();
|
||||
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)
|
||||
|
|
@ -982,15 +991,12 @@ static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
|
|||
icmp_packet->msg_type = TTL_EXCEEDED;
|
||||
icmp_packet->ttl = TTL;
|
||||
|
||||
send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
|
||||
send_skb_packet(skb, router->if_incoming, router->addr);
|
||||
ret = NET_RX_SUCCESS;
|
||||
goto out;
|
||||
|
||||
unlock:
|
||||
rcu_read_unlock();
|
||||
out:
|
||||
if (neigh_node)
|
||||
neigh_node_free_ref(neigh_node);
|
||||
if (router)
|
||||
neigh_node_free_ref(router);
|
||||
if (orig_node)
|
||||
orig_node_free_ref(orig_node);
|
||||
return ret;
|
||||
|
|
@ -1003,7 +1009,7 @@ int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if)
|
|||
struct icmp_packet_rr *icmp_packet;
|
||||
struct ethhdr *ethhdr;
|
||||
struct orig_node *orig_node = NULL;
|
||||
struct neigh_node *neigh_node = NULL;
|
||||
struct neigh_node *router = NULL;
|
||||
int hdr_size = sizeof(struct icmp_packet);
|
||||
int ret = NET_RX_DROP;
|
||||
|
||||
|
|
@ -1050,23 +1056,13 @@ int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if)
|
|||
return recv_icmp_ttl_exceeded(bat_priv, skb);
|
||||
|
||||
/* get routing information */
|
||||
rcu_read_lock();
|
||||
orig_node = orig_hash_find(bat_priv, icmp_packet->dst);
|
||||
|
||||
if (!orig_node)
|
||||
goto unlock;
|
||||
goto out;
|
||||
|
||||
neigh_node = orig_node->router;
|
||||
|
||||
if (!neigh_node)
|
||||
goto unlock;
|
||||
|
||||
if (!atomic_inc_not_zero(&neigh_node->refcount)) {
|
||||
neigh_node = NULL;
|
||||
goto unlock;
|
||||
}
|
||||
|
||||
rcu_read_unlock();
|
||||
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)
|
||||
|
|
@ -1078,15 +1074,12 @@ int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if)
|
|||
icmp_packet->ttl--;
|
||||
|
||||
/* route it */
|
||||
send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
|
||||
send_skb_packet(skb, router->if_incoming, router->addr);
|
||||
ret = NET_RX_SUCCESS;
|
||||
goto out;
|
||||
|
||||
unlock:
|
||||
rcu_read_unlock();
|
||||
out:
|
||||
if (neigh_node)
|
||||
neigh_node_free_ref(neigh_node);
|
||||
if (router)
|
||||
neigh_node_free_ref(router);
|
||||
if (orig_node)
|
||||
orig_node_free_ref(orig_node);
|
||||
return ret;
|
||||
|
|
@ -1208,7 +1201,8 @@ struct neigh_node *find_router(struct bat_priv *bat_priv,
|
|||
if (!orig_node)
|
||||
return NULL;
|
||||
|
||||
if (!orig_node->router)
|
||||
router = orig_node_get_router(orig_node);
|
||||
if (!router)
|
||||
return NULL;
|
||||
|
||||
/* without bonding, the first node should
|
||||
|
|
@ -1217,9 +1211,8 @@ struct neigh_node *find_router(struct bat_priv *bat_priv,
|
|||
|
||||
rcu_read_lock();
|
||||
/* select default router to output */
|
||||
router = orig_node->router;
|
||||
router_orig = orig_node->router->orig_node;
|
||||
if (!router_orig || !atomic_inc_not_zero(&router->refcount)) {
|
||||
router_orig = router->orig_node;
|
||||
if (!router_orig) {
|
||||
rcu_read_unlock();
|
||||
return NULL;
|
||||
}
|
||||
|
|
@ -1251,7 +1244,6 @@ struct neigh_node *find_router(struct bat_priv *bat_priv,
|
|||
if (atomic_read(&primary_orig_node->bond_candidates) < 2)
|
||||
goto return_router;
|
||||
|
||||
|
||||
/* all nodes between should choose a candidate which
|
||||
* is is not on the interface where the packet came
|
||||
* in. */
|
||||
|
|
|
|||
|
|
@ -308,6 +308,7 @@ void schedule_forward_packet(struct orig_node *orig_node,
|
|||
struct hard_iface *if_incoming)
|
||||
{
|
||||
struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
|
||||
struct neigh_node *router;
|
||||
unsigned char in_tq, in_ttl, tq_avg = 0;
|
||||
unsigned long send_time;
|
||||
|
||||
|
|
@ -316,6 +317,8 @@ void schedule_forward_packet(struct orig_node *orig_node,
|
|||
return;
|
||||
}
|
||||
|
||||
router = orig_node_get_router(orig_node);
|
||||
|
||||
in_tq = batman_packet->tq;
|
||||
in_ttl = batman_packet->ttl;
|
||||
|
||||
|
|
@ -324,20 +327,22 @@ void schedule_forward_packet(struct orig_node *orig_node,
|
|||
|
||||
/* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast
|
||||
* of our best tq value */
|
||||
if ((orig_node->router) && (orig_node->router->tq_avg != 0)) {
|
||||
if (router && router->tq_avg != 0) {
|
||||
|
||||
/* rebroadcast ogm of best ranking neighbor as is */
|
||||
if (!compare_eth(orig_node->router->addr, ethhdr->h_source)) {
|
||||
batman_packet->tq = orig_node->router->tq_avg;
|
||||
if (!compare_eth(router->addr, ethhdr->h_source)) {
|
||||
batman_packet->tq = router->tq_avg;
|
||||
|
||||
if (orig_node->router->last_ttl)
|
||||
batman_packet->ttl = orig_node->router->last_ttl
|
||||
- 1;
|
||||
if (router->last_ttl)
|
||||
batman_packet->ttl = router->last_ttl - 1;
|
||||
}
|
||||
|
||||
tq_avg = orig_node->router->tq_avg;
|
||||
tq_avg = router->tq_avg;
|
||||
}
|
||||
|
||||
if (router)
|
||||
neigh_node_free_ref(router);
|
||||
|
||||
/* apply hop penalty */
|
||||
batman_packet->tq = hop_penalty(batman_packet->tq, bat_priv);
|
||||
|
||||
|
|
|
|||
|
|
@ -67,7 +67,7 @@ struct hard_iface {
|
|||
struct orig_node {
|
||||
uint8_t orig[ETH_ALEN];
|
||||
uint8_t primary_addr[ETH_ALEN];
|
||||
struct neigh_node *router;
|
||||
struct neigh_node __rcu *router; /* rcu protected pointer */
|
||||
unsigned long *bcast_own;
|
||||
uint8_t *bcast_own_sum;
|
||||
unsigned long last_valid;
|
||||
|
|
@ -83,7 +83,7 @@ struct orig_node {
|
|||
uint32_t last_bcast_seqno;
|
||||
struct hlist_head neigh_list;
|
||||
struct list_head frag_list;
|
||||
spinlock_t neigh_list_lock; /* protects neighbor list */
|
||||
spinlock_t neigh_list_lock; /* protects neigh_list and router */
|
||||
atomic_t refcount;
|
||||
struct rcu_head rcu;
|
||||
struct hlist_node hash_entry;
|
||||
|
|
|
|||
|
|
@ -558,6 +558,7 @@ static int find_best_vis_server(struct bat_priv *bat_priv,
|
|||
struct vis_info *info)
|
||||
{
|
||||
struct hashtable_t *hash = bat_priv->orig_hash;
|
||||
struct neigh_node *router;
|
||||
struct hlist_node *node;
|
||||
struct hlist_head *head;
|
||||
struct orig_node *orig_node;
|
||||
|
|
@ -571,13 +572,17 @@ static int find_best_vis_server(struct bat_priv *bat_priv,
|
|||
|
||||
rcu_read_lock();
|
||||
hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
|
||||
if ((orig_node) && (orig_node->router) &&
|
||||
(orig_node->flags & VIS_SERVER) &&
|
||||
(orig_node->router->tq_avg > best_tq)) {
|
||||
best_tq = orig_node->router->tq_avg;
|
||||
router = orig_node_get_router(orig_node);
|
||||
if (!router)
|
||||
continue;
|
||||
|
||||
if ((orig_node->flags & VIS_SERVER) &&
|
||||
(router->tq_avg > best_tq)) {
|
||||
best_tq = router->tq_avg;
|
||||
memcpy(packet->target_orig, orig_node->orig,
|
||||
ETH_ALEN);
|
||||
}
|
||||
neigh_node_free_ref(router);
|
||||
}
|
||||
rcu_read_unlock();
|
||||
}
|
||||
|
|
@ -605,7 +610,7 @@ static int generate_vis_packet(struct bat_priv *bat_priv)
|
|||
struct hlist_node *node;
|
||||
struct hlist_head *head;
|
||||
struct orig_node *orig_node;
|
||||
struct neigh_node *neigh_node;
|
||||
struct neigh_node *router;
|
||||
struct vis_info *info = (struct vis_info *)bat_priv->my_vis_info;
|
||||
struct vis_packet *packet = (struct vis_packet *)info->skb_packet->data;
|
||||
struct vis_info_entry *entry;
|
||||
|
|
@ -633,30 +638,32 @@ static int generate_vis_packet(struct bat_priv *bat_priv)
|
|||
|
||||
rcu_read_lock();
|
||||
hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
|
||||
neigh_node = orig_node->router;
|
||||
|
||||
if (!neigh_node)
|
||||
router = orig_node_get_router(orig_node);
|
||||
if (!router)
|
||||
continue;
|
||||
|
||||
if (!compare_eth(neigh_node->addr, orig_node->orig))
|
||||
continue;
|
||||
if (!compare_eth(router->addr, orig_node->orig))
|
||||
goto next;
|
||||
|
||||
if (neigh_node->if_incoming->if_status != IF_ACTIVE)
|
||||
continue;
|
||||
if (router->if_incoming->if_status != IF_ACTIVE)
|
||||
goto next;
|
||||
|
||||
if (neigh_node->tq_avg < 1)
|
||||
continue;
|
||||
if (router->tq_avg < 1)
|
||||
goto next;
|
||||
|
||||
/* fill one entry into buffer. */
|
||||
entry = (struct vis_info_entry *)
|
||||
skb_put(info->skb_packet, sizeof(*entry));
|
||||
memcpy(entry->src,
|
||||
neigh_node->if_incoming->net_dev->dev_addr,
|
||||
router->if_incoming->net_dev->dev_addr,
|
||||
ETH_ALEN);
|
||||
memcpy(entry->dest, orig_node->orig, ETH_ALEN);
|
||||
entry->quality = neigh_node->tq_avg;
|
||||
entry->quality = router->tq_avg;
|
||||
packet->entries++;
|
||||
|
||||
next:
|
||||
neigh_node_free_ref(router);
|
||||
|
||||
if (vis_packet_full(info))
|
||||
goto unlock;
|
||||
}
|
||||
|
|
@ -725,6 +732,7 @@ static void purge_vis_packets(struct bat_priv *bat_priv)
|
|||
static void broadcast_vis_packet(struct bat_priv *bat_priv,
|
||||
struct vis_info *info)
|
||||
{
|
||||
struct neigh_node *router;
|
||||
struct hashtable_t *hash = bat_priv->orig_hash;
|
||||
struct hlist_node *node;
|
||||
struct hlist_head *head;
|
||||
|
|
@ -745,19 +753,26 @@ static void broadcast_vis_packet(struct bat_priv *bat_priv,
|
|||
rcu_read_lock();
|
||||
hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
|
||||
/* if it's a vis server and reachable, send it. */
|
||||
if ((!orig_node) || (!orig_node->router))
|
||||
continue;
|
||||
if (!(orig_node->flags & VIS_SERVER))
|
||||
continue;
|
||||
|
||||
router = orig_node_get_router(orig_node);
|
||||
if (!router)
|
||||
continue;
|
||||
|
||||
/* don't send it if we already received the packet from
|
||||
* this node. */
|
||||
if (recv_list_is_in(bat_priv, &info->recv_list,
|
||||
orig_node->orig))
|
||||
orig_node->orig)) {
|
||||
neigh_node_free_ref(router);
|
||||
continue;
|
||||
}
|
||||
|
||||
memcpy(packet->target_orig, orig_node->orig, ETH_ALEN);
|
||||
hard_iface = orig_node->router->if_incoming;
|
||||
memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
|
||||
hard_iface = router->if_incoming;
|
||||
memcpy(dstaddr, router->addr, ETH_ALEN);
|
||||
|
||||
neigh_node_free_ref(router);
|
||||
|
||||
skb = skb_clone(info->skb_packet, GFP_ATOMIC);
|
||||
if (skb)
|
||||
|
|
@ -772,45 +787,29 @@ static void unicast_vis_packet(struct bat_priv *bat_priv,
|
|||
struct vis_info *info)
|
||||
{
|
||||
struct orig_node *orig_node;
|
||||
struct neigh_node *neigh_node = NULL;
|
||||
struct neigh_node *router = NULL;
|
||||
struct sk_buff *skb;
|
||||
struct vis_packet *packet;
|
||||
|
||||
packet = (struct vis_packet *)info->skb_packet->data;
|
||||
|
||||
rcu_read_lock();
|
||||
orig_node = orig_hash_find(bat_priv, packet->target_orig);
|
||||
|
||||
if (!orig_node)
|
||||
goto unlock;
|
||||
goto out;
|
||||
|
||||
neigh_node = orig_node->router;
|
||||
|
||||
if (!neigh_node)
|
||||
goto unlock;
|
||||
|
||||
if (!atomic_inc_not_zero(&neigh_node->refcount)) {
|
||||
neigh_node = NULL;
|
||||
goto unlock;
|
||||
}
|
||||
|
||||
rcu_read_unlock();
|
||||
router = orig_node_get_router(orig_node);
|
||||
if (!router)
|
||||
goto out;
|
||||
|
||||
skb = skb_clone(info->skb_packet, GFP_ATOMIC);
|
||||
if (skb)
|
||||
send_skb_packet(skb, neigh_node->if_incoming,
|
||||
neigh_node->addr);
|
||||
send_skb_packet(skb, router->if_incoming, router->addr);
|
||||
|
||||
goto out;
|
||||
|
||||
unlock:
|
||||
rcu_read_unlock();
|
||||
out:
|
||||
if (neigh_node)
|
||||
neigh_node_free_ref(neigh_node);
|
||||
if (router)
|
||||
neigh_node_free_ref(router);
|
||||
if (orig_node)
|
||||
orig_node_free_ref(orig_node);
|
||||
return;
|
||||
}
|
||||
|
||||
/* only send one vis packet. called from send_vis_packets() */
|
||||
|
|
|
|||
Loading…
Reference in New Issue