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authorPaul Mundt <lethal@linux-sh.org>2011-03-17 16:44:08 +0900
committerPaul Mundt <lethal@linux-sh.org>2011-03-17 16:44:08 +0900
commit1d2a1959fe534279cf37aba20b08c24c20840e52 (patch)
tree67c0b9aa7fe22a44bf0b4af88947799203eb8f67 /net/batman-adv/routing.c
parent5a79ce76e9bb8f4b2cd8106ee36d15ee05013bcf (diff)
parent054cfaacf88865bff1dd58d305443d5d6c068a08 (diff)
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into sh-latest
Diffstat (limited to 'net/batman-adv/routing.c')
-rw-r--r--net/batman-adv/routing.c1000
1 files changed, 569 insertions, 431 deletions
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index 8828eddd3f7..c172f5d0e05 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
+ * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
*
* Marek Lindner, Simon Wunderlich
*
@@ -28,7 +28,6 @@
#include "icmp_socket.h"
#include "translation-table.h"
#include "originator.h"
-#include "types.h"
#include "ring_buffer.h"
#include "vis.h"
#include "aggregation.h"
@@ -36,35 +35,33 @@
#include "gateway_client.h"
#include "unicast.h"
-void slide_own_bcast_window(struct batman_if *batman_if)
+void slide_own_bcast_window(struct hard_iface *hard_iface)
{
- struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
+ struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
struct hashtable_t *hash = bat_priv->orig_hash;
- struct hlist_node *walk;
+ struct hlist_node *node;
struct hlist_head *head;
- struct element_t *bucket;
struct orig_node *orig_node;
unsigned long *word;
int i;
size_t word_index;
- spin_lock_bh(&bat_priv->orig_hash_lock);
-
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
- hlist_for_each_entry(bucket, walk, head, hlist) {
- orig_node = bucket->data;
- word_index = batman_if->if_num * NUM_WORDS;
+ 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[batman_if->if_num] =
+ orig_node->bcast_own_sum[hard_iface->if_num] =
bit_packet_count(word);
+ spin_unlock_bh(&orig_node->ogm_cnt_lock);
}
+ rcu_read_unlock();
}
-
- spin_unlock_bh(&bat_priv->orig_hash_lock);
}
static void update_HNA(struct bat_priv *bat_priv, struct orig_node *orig_node,
@@ -90,6 +87,8 @@ static void update_route(struct bat_priv *bat_priv,
struct neigh_node *neigh_node,
unsigned char *hna_buff, int hna_buff_len)
{
+ struct neigh_node *neigh_node_tmp;
+
/* route deleted */
if ((orig_node->router) && (!neigh_node)) {
@@ -116,7 +115,12 @@ static void update_route(struct bat_priv *bat_priv,
orig_node->router->addr);
}
+ if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount))
+ neigh_node = NULL;
+ neigh_node_tmp = orig_node->router;
orig_node->router = neigh_node;
+ if (neigh_node_tmp)
+ neigh_node_free_ref(neigh_node_tmp);
}
@@ -139,73 +143,93 @@ void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node,
static int is_bidirectional_neigh(struct orig_node *orig_node,
struct orig_node *orig_neigh_node,
struct batman_packet *batman_packet,
- struct batman_if *if_incoming)
+ struct hard_iface *if_incoming)
{
struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
- struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
+ struct neigh_node *neigh_node = NULL, *tmp_neigh_node;
+ struct hlist_node *node;
unsigned char total_count;
+ uint8_t orig_eq_count, neigh_rq_count, tq_own;
+ int tq_asym_penalty, ret = 0;
if (orig_node == orig_neigh_node) {
- list_for_each_entry(tmp_neigh_node,
- &orig_node->neigh_list,
- list) {
-
- if (compare_orig(tmp_neigh_node->addr,
- orig_neigh_node->orig) &&
- (tmp_neigh_node->if_incoming == if_incoming))
- neigh_node = tmp_neigh_node;
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(tmp_neigh_node, node,
+ &orig_node->neigh_list, list) {
+
+ if (!compare_eth(tmp_neigh_node->addr,
+ orig_neigh_node->orig))
+ continue;
+
+ if (tmp_neigh_node->if_incoming != if_incoming)
+ continue;
+
+ if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
+ continue;
+
+ neigh_node = tmp_neigh_node;
}
+ rcu_read_unlock();
if (!neigh_node)
neigh_node = create_neighbor(orig_node,
orig_neigh_node,
orig_neigh_node->orig,
if_incoming);
- /* create_neighbor failed, return 0 */
if (!neigh_node)
- return 0;
+ goto out;
neigh_node->last_valid = jiffies;
} else {
/* find packet count of corresponding one hop neighbor */
- list_for_each_entry(tmp_neigh_node,
- &orig_neigh_node->neigh_list, list) {
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(tmp_neigh_node, node,
+ &orig_neigh_node->neigh_list, list) {
- if (compare_orig(tmp_neigh_node->addr,
- orig_neigh_node->orig) &&
- (tmp_neigh_node->if_incoming == if_incoming))
- neigh_node = tmp_neigh_node;
+ if (!compare_eth(tmp_neigh_node->addr,
+ orig_neigh_node->orig))
+ continue;
+
+ if (tmp_neigh_node->if_incoming != if_incoming)
+ continue;
+
+ if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
+ continue;
+
+ neigh_node = tmp_neigh_node;
}
+ rcu_read_unlock();
if (!neigh_node)
neigh_node = create_neighbor(orig_neigh_node,
orig_neigh_node,
orig_neigh_node->orig,
if_incoming);
- /* create_neighbor failed, return 0 */
if (!neigh_node)
- return 0;
+ goto out;
}
orig_node->last_valid = jiffies;
+ spin_lock_bh(&orig_node->ogm_cnt_lock);
+ orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
+ neigh_rq_count = neigh_node->real_packet_count;
+ spin_unlock_bh(&orig_node->ogm_cnt_lock);
+
/* pay attention to not get a value bigger than 100 % */
- total_count = (orig_neigh_node->bcast_own_sum[if_incoming->if_num] >
- neigh_node->real_packet_count ?
- neigh_node->real_packet_count :
- orig_neigh_node->bcast_own_sum[if_incoming->if_num]);
+ total_count = (orig_eq_count > neigh_rq_count ?
+ neigh_rq_count : orig_eq_count);
/* if we have too few packets (too less data) we set tq_own to zero */
/* if we receive too few packets it is not considered bidirectional */
if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
- (neigh_node->real_packet_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
- orig_neigh_node->tq_own = 0;
+ (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
+ tq_own = 0;
else
/* neigh_node->real_packet_count is never zero as we
* only purge old information when getting new
* information */
- orig_neigh_node->tq_own = (TQ_MAX_VALUE * total_count) /
- neigh_node->real_packet_count;
+ tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count;
/*
* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
@@ -213,20 +237,16 @@ static int is_bidirectional_neigh(struct orig_node *orig_node,
* punishes asymmetric links more. This will give a value
* between 0 and TQ_MAX_VALUE
*/
- orig_neigh_node->tq_asym_penalty =
- TQ_MAX_VALUE -
- (TQ_MAX_VALUE *
- (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
- (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
- (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count)) /
- (TQ_LOCAL_WINDOW_SIZE *
- TQ_LOCAL_WINDOW_SIZE *
- TQ_LOCAL_WINDOW_SIZE);
-
- batman_packet->tq = ((batman_packet->tq *
- orig_neigh_node->tq_own *
- orig_neigh_node->tq_asym_penalty) /
- (TQ_MAX_VALUE * TQ_MAX_VALUE));
+ tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE *
+ (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
+ (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
+ (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) /
+ (TQ_LOCAL_WINDOW_SIZE *
+ TQ_LOCAL_WINDOW_SIZE *
+ TQ_LOCAL_WINDOW_SIZE);
+
+ batman_packet->tq = ((batman_packet->tq * tq_own * tq_asym_penalty) /
+ (TQ_MAX_VALUE * TQ_MAX_VALUE));
bat_dbg(DBG_BATMAN, bat_priv,
"bidirectional: "
@@ -234,34 +254,141 @@ static int is_bidirectional_neigh(struct orig_node *orig_node,
"real recv = %2i, local tq: %3i, asym_penalty: %3i, "
"total tq: %3i\n",
orig_node->orig, orig_neigh_node->orig, total_count,
- neigh_node->real_packet_count, orig_neigh_node->tq_own,
- orig_neigh_node->tq_asym_penalty, batman_packet->tq);
+ neigh_rq_count, tq_own, tq_asym_penalty, batman_packet->tq);
/* if link has the minimum required transmission quality
* consider it bidirectional */
if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
- return 1;
+ ret = 1;
- return 0;
+out:
+ if (neigh_node)
+ neigh_node_free_ref(neigh_node);
+ return ret;
+}
+
+/* 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;
+}
+
+static void bonding_candidate_add(struct orig_node *orig_node,
+ struct neigh_node *neigh_node)
+{
+ struct hlist_node *node;
+ struct neigh_node *tmp_neigh_node;
+ uint8_t best_tq, 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;
+
+ if (!orig_node->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)
+ goto candidate_del;
+
+ /**
+ * check if we have another candidate with the same mac address or
+ * interface. If we do, we won't select this candidate because of
+ * possible interference.
+ */
+ hlist_for_each_entry_rcu(tmp_neigh_node, node,
+ &orig_node->neigh_list, list) {
+
+ if (tmp_neigh_node == neigh_node)
+ continue;
+
+ /* we only care if the other candidate is even
+ * considered as candidate. */
+ if (list_empty(&tmp_neigh_node->bonding_list))
+ continue;
+
+ if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) ||
+ (compare_eth(neigh_node->addr, tmp_neigh_node->addr))) {
+ interference_candidate = 1;
+ break;
+ }
+ }
+
+ /* don't care further if it is an interference candidate */
+ if (interference_candidate)
+ goto candidate_del;
+
+ /* this neighbor already is part of our candidate list */
+ if (!list_empty(&neigh_node->bonding_list))
+ goto out;
+
+ if (!atomic_inc_not_zero(&neigh_node->refcount))
+ goto out;
+
+ list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list);
+ atomic_inc(&orig_node->bond_candidates);
+ goto out;
+
+candidate_del:
+ bonding_candidate_del(orig_node, neigh_node);
+
+out:
+ spin_unlock_bh(&orig_node->neigh_list_lock);
+ return;
+}
+
+/* copy primary address for bonding */
+static void bonding_save_primary(struct orig_node *orig_node,
+ struct orig_node *orig_neigh_node,
+ struct batman_packet *batman_packet)
+{
+ if (!(batman_packet->flags & PRIMARIES_FIRST_HOP))
+ return;
+
+ memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN);
}
static void update_orig(struct bat_priv *bat_priv,
struct orig_node *orig_node,
struct ethhdr *ethhdr,
struct batman_packet *batman_packet,
- struct batman_if *if_incoming,
+ struct hard_iface *if_incoming,
unsigned char *hna_buff, int hna_buff_len,
char is_duplicate)
{
struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
+ struct orig_node *orig_node_tmp;
+ struct hlist_node *node;
int tmp_hna_buff_len;
+ uint8_t bcast_own_sum_orig, bcast_own_sum_neigh;
bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): "
"Searching and updating originator entry of received packet\n");
- list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
- if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
- (tmp_neigh_node->if_incoming == if_incoming)) {
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(tmp_neigh_node, node,
+ &orig_node->neigh_list, list) {
+ if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
+ (tmp_neigh_node->if_incoming == if_incoming) &&
+ atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
+ if (neigh_node)
+ neigh_node_free_ref(neigh_node);
neigh_node = tmp_neigh_node;
continue;
}
@@ -280,16 +407,20 @@ static void update_orig(struct bat_priv *bat_priv,
orig_tmp = get_orig_node(bat_priv, ethhdr->h_source);
if (!orig_tmp)
- return;
+ goto unlock;
neigh_node = create_neighbor(orig_node, orig_tmp,
ethhdr->h_source, if_incoming);
+
+ orig_node_free_ref(orig_tmp);
if (!neigh_node)
- return;
+ goto unlock;
} else
bat_dbg(DBG_BATMAN, bat_priv,
"Updating existing last-hop neighbor of originator\n");
+ rcu_read_unlock();
+
orig_node->flags = batman_packet->flags;
neigh_node->last_valid = jiffies;
@@ -303,6 +434,8 @@ static void update_orig(struct bat_priv *bat_priv,
neigh_node->last_ttl = batman_packet->ttl;
}
+ bonding_candidate_add(orig_node, neigh_node);
+
tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ?
batman_packet->num_hna * ETH_ALEN : hna_buff_len);
@@ -319,10 +452,22 @@ static void update_orig(struct bat_priv *bat_priv,
/* 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->router->orig_node->bcast_own_sum[if_incoming->if_num]
- >= neigh_node->orig_node->bcast_own_sum[if_incoming->if_num])))
- goto update_hna;
+ (neigh_node->tq_avg == orig_node->router->tq_avg)) {
+ orig_node_tmp = orig_node->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];
+ spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
+
+ orig_node_tmp = neigh_node->orig_node;
+ spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
+ bcast_own_sum_neigh =
+ orig_node_tmp->bcast_own_sum[if_incoming->if_num];
+ spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
+
+ if (bcast_own_sum_orig >= bcast_own_sum_neigh)
+ goto update_hna;
+ }
update_routes(bat_priv, orig_node, neigh_node,
hna_buff, tmp_hna_buff_len);
@@ -343,6 +488,14 @@ update_gw:
(atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) &&
(atomic_read(&bat_priv->gw_sel_class) > 2))
gw_check_election(bat_priv, orig_node);
+
+ goto out;
+
+unlock:
+ rcu_read_unlock();
+out:
+ if (neigh_node)
+ neigh_node_free_ref(neigh_node);
}
/* checks whether the host restarted and is in the protection time.
@@ -380,34 +533,38 @@ static int window_protected(struct bat_priv *bat_priv,
*/
static char count_real_packets(struct ethhdr *ethhdr,
struct batman_packet *batman_packet,
- struct batman_if *if_incoming)
+ struct hard_iface *if_incoming)
{
struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
struct orig_node *orig_node;
struct neigh_node *tmp_neigh_node;
+ struct hlist_node *node;
char is_duplicate = 0;
int32_t seq_diff;
int need_update = 0;
- int set_mark;
+ int set_mark, ret = -1;
orig_node = get_orig_node(bat_priv, batman_packet->orig);
if (!orig_node)
return 0;
+ spin_lock_bh(&orig_node->ogm_cnt_lock);
seq_diff = batman_packet->seqno - orig_node->last_real_seqno;
/* signalize caller that the packet is to be dropped. */
if (window_protected(bat_priv, seq_diff,
&orig_node->batman_seqno_reset))
- return -1;
+ goto out;
- list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(tmp_neigh_node, node,
+ &orig_node->neigh_list, list) {
is_duplicate |= get_bit_status(tmp_neigh_node->real_bits,
orig_node->last_real_seqno,
batman_packet->seqno);
- if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
+ if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
(tmp_neigh_node->if_incoming == if_incoming))
set_mark = 1;
else
@@ -421,6 +578,7 @@ static char count_real_packets(struct ethhdr *ethhdr,
tmp_neigh_node->real_packet_count =
bit_packet_count(tmp_neigh_node->real_bits);
}
+ rcu_read_unlock();
if (need_update) {
bat_dbg(DBG_BATMAN, bat_priv,
@@ -429,123 +587,21 @@ static char count_real_packets(struct ethhdr *ethhdr,
orig_node->last_real_seqno = batman_packet->seqno;
}
- return is_duplicate;
-}
-
-/* copy primary address for bonding */
-static void mark_bonding_address(struct bat_priv *bat_priv,
- struct orig_node *orig_node,
- struct orig_node *orig_neigh_node,
- struct batman_packet *batman_packet)
+ ret = is_duplicate;
-{
- if (batman_packet->flags & PRIMARIES_FIRST_HOP)
- memcpy(orig_neigh_node->primary_addr,
- orig_node->orig, ETH_ALEN);
-
- return;
-}
-
-/* mark possible bond.candidates in the neighbor list */
-void update_bonding_candidates(struct bat_priv *bat_priv,
- struct orig_node *orig_node)
-{
- int candidates;
- int interference_candidate;
- int best_tq;
- struct neigh_node *tmp_neigh_node, *tmp_neigh_node2;
- struct neigh_node *first_candidate, *last_candidate;
-
- /* update the candidates for this originator */
- if (!orig_node->router) {
- orig_node->bond.candidates = 0;
- return;
- }
-
- best_tq = orig_node->router->tq_avg;
-
- /* update bond.candidates */
-
- candidates = 0;
-
- /* mark other nodes which also received "PRIMARIES FIRST HOP" packets
- * as "bonding partner" */
-
- /* first, zero the list */
- list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
- tmp_neigh_node->next_bond_candidate = NULL;
- }
-
- first_candidate = NULL;
- last_candidate = NULL;
- list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
-
- /* only consider if it has the same primary address ... */
- if (memcmp(orig_node->orig,
- tmp_neigh_node->orig_node->primary_addr,
- ETH_ALEN) != 0)
- continue;
-
- /* ... and is good enough to be considered */
- if (tmp_neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD)
- continue;
-
- /* 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. */
-
- interference_candidate = 0;
- list_for_each_entry(tmp_neigh_node2,
- &orig_node->neigh_list, list) {
-
- if (tmp_neigh_node2 == tmp_neigh_node)
- continue;
-
- /* we only care if the other candidate is even
- * considered as candidate. */
- if (!tmp_neigh_node2->next_bond_candidate)
- continue;
-
-
- if ((tmp_neigh_node->if_incoming ==
- tmp_neigh_node2->if_incoming)
- || (memcmp(tmp_neigh_node->addr,
- tmp_neigh_node2->addr, ETH_ALEN) == 0)) {
-
- interference_candidate = 1;
- break;
- }
- }
- /* don't care further if it is an interference candidate */
- if (interference_candidate)
- continue;
-
- if (!first_candidate) {
- first_candidate = tmp_neigh_node;
- tmp_neigh_node->next_bond_candidate = first_candidate;
- } else
- tmp_neigh_node->next_bond_candidate = last_candidate;
-
- last_candidate = tmp_neigh_node;
-
- candidates++;
- }
-
- if (candidates > 0) {
- first_candidate->next_bond_candidate = last_candidate;
- orig_node->bond.selected = first_candidate;
- }
-
- orig_node->bond.candidates = candidates;
+out:
+ spin_unlock_bh(&orig_node->ogm_cnt_lock);
+ orig_node_free_ref(orig_node);
+ return ret;
}
void receive_bat_packet(struct ethhdr *ethhdr,
- struct batman_packet *batman_packet,
- unsigned char *hna_buff, int hna_buff_len,
- struct batman_if *if_incoming)
+ struct batman_packet *batman_packet,
+ unsigned char *hna_buff, int hna_buff_len,
+ struct hard_iface *if_incoming)
{
struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
- struct batman_if *batman_if;
+ struct hard_iface *hard_iface;
struct orig_node *orig_neigh_node, *orig_node;
char has_directlink_flag;
char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
@@ -573,8 +629,8 @@ void receive_bat_packet(struct ethhdr *ethhdr,
has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0);
- is_single_hop_neigh = (compare_orig(ethhdr->h_source,
- batman_packet->orig) ? 1 : 0);
+ is_single_hop_neigh = (compare_eth(ethhdr->h_source,
+ batman_packet->orig) ? 1 : 0);
bat_dbg(DBG_BATMAN, bat_priv,
"Received BATMAN packet via NB: %pM, IF: %s [%pM] "
@@ -587,26 +643,26 @@ void receive_bat_packet(struct ethhdr *ethhdr,
has_directlink_flag);
rcu_read_lock();
- list_for_each_entry_rcu(batman_if, &if_list, list) {
- if (batman_if->if_status != IF_ACTIVE)
+ list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
+ if (hard_iface->if_status != IF_ACTIVE)
continue;
- if (batman_if->soft_iface != if_incoming->soft_iface)
+ if (hard_iface->soft_iface != if_incoming->soft_iface)
continue;
- if (compare_orig(ethhdr->h_source,
- batman_if->net_dev->dev_addr))
+ if (compare_eth(ethhdr->h_source,
+ hard_iface->net_dev->dev_addr))
is_my_addr = 1;
- if (compare_orig(batman_packet->orig,
- batman_if->net_dev->dev_addr))
+ if (compare_eth(batman_packet->orig,
+ hard_iface->net_dev->dev_addr))
is_my_orig = 1;
- if (compare_orig(batman_packet->prev_sender,
- batman_if->net_dev->dev_addr))
+ if (compare_eth(batman_packet->prev_sender,
+ hard_iface->net_dev->dev_addr))
is_my_oldorig = 1;
- if (compare_orig(ethhdr->h_source, broadcast_addr))
+ if (compare_eth(ethhdr->h_source, broadcast_addr))
is_broadcast = 1;
}
rcu_read_unlock();
@@ -638,7 +694,6 @@ void receive_bat_packet(struct ethhdr *ethhdr,
int offset;
orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
-
if (!orig_neigh_node)
return;
@@ -647,18 +702,22 @@ void receive_bat_packet(struct ethhdr *ethhdr,
/* if received seqno equals last send seqno save new
* seqno for bidirectional check */
if (has_directlink_flag &&
- compare_orig(if_incoming->net_dev->dev_addr,
- batman_packet->orig) &&
+ compare_eth(if_incoming->net_dev->dev_addr,
+ batman_packet->orig) &&
(batman_packet->seqno - if_incoming_seqno + 2 == 0)) {
offset = if_incoming->if_num * NUM_WORDS;
+
+ spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
word = &(orig_neigh_node->bcast_own[offset]);
bit_mark(word, 0);
orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
bit_packet_count(word);
+ spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
}
bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
"originator packet from myself (via neighbor)\n");
+ orig_node_free_ref(orig_neigh_node);
return;
}
@@ -679,27 +738,27 @@ void receive_bat_packet(struct ethhdr *ethhdr,
bat_dbg(DBG_BATMAN, bat_priv,
"Drop packet: packet within seqno protection time "
"(sender: %pM)\n", ethhdr->h_source);
- return;
+ goto out;
}
if (batman_packet->tq == 0) {
bat_dbg(DBG_BATMAN, bat_priv,
"Drop packet: originator packet with tq equal 0\n");
- return;
+ goto out;
}
/* avoid temporary routing loops */
if ((orig_node->router) &&
(orig_node->router->orig_node->router) &&
- (compare_orig(orig_node->router->addr,
- batman_packet->prev_sender)) &&
- !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) &&
- (compare_orig(orig_node->router->addr,
- orig_node->router->orig_node->router->addr))) {
+ (compare_eth(orig_node->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))) {
bat_dbg(DBG_BATMAN, bat_priv,
"Drop packet: ignoring all rebroadcast packets that "
"may make me loop (sender: %pM)\n", ethhdr->h_source);
- return;
+ goto out;
}
/* if sender is a direct neighbor the sender mac equals
@@ -708,19 +767,21 @@ void receive_bat_packet(struct ethhdr *ethhdr,
orig_node :
get_orig_node(bat_priv, ethhdr->h_source));
if (!orig_neigh_node)
- return;
+ goto out;
/* 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)) {
bat_dbg(DBG_BATMAN, bat_priv,
"Drop packet: OGM via unknown neighbor!\n");
- return;
+ goto out_neigh;
}
is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node,
batman_packet, if_incoming);
+ bonding_save_primary(orig_node, orig_neigh_node, batman_packet);
+
/* update ranking if it is not a duplicate or has the same
* seqno and similar ttl as the non-duplicate */
if (is_bidirectional &&
@@ -730,10 +791,6 @@ void receive_bat_packet(struct ethhdr *ethhdr,
update_orig(bat_priv, orig_node, ethhdr, batman_packet,
if_incoming, hna_buff, hna_buff_len, is_duplicate);
- mark_bonding_address(bat_priv, orig_node,
- orig_neigh_node, batman_packet);
- update_bonding_candidates(bat_priv, orig_node);
-
/* is single hop (direct) neighbor */
if (is_single_hop_neigh) {
@@ -743,31 +800,36 @@ void receive_bat_packet(struct ethhdr *ethhdr,
bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "
"rebroadcast neighbor packet with direct link flag\n");
- return;
+ goto out_neigh;
}
/* multihop originator */
if (!is_bidirectional) {
bat_dbg(DBG_BATMAN, bat_priv,
"Drop packet: not received via bidirectional link\n");
- return;
+ goto out_neigh;
}
if (is_duplicate) {
bat_dbg(DBG_BATMAN, bat_priv,
"Drop packet: duplicate packet received\n");
- return;
+ goto out_neigh;
}
bat_dbg(DBG_BATMAN, bat_priv,
"Forwarding packet: rebroadcast originator packet\n");
schedule_forward_packet(orig_node, ethhdr, batman_packet,
0, hna_buff_len, if_incoming);
+
+out_neigh:
+ if ((orig_neigh_node) && (!is_single_hop_neigh))
+ orig_node_free_ref(orig_neigh_node);
+out:
+ orig_node_free_ref(orig_node);
}
-int recv_bat_packet(struct sk_buff *skb, struct batman_if *batman_if)
+int recv_bat_packet(struct sk_buff *skb, struct hard_iface *hard_iface)
{
- struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
struct ethhdr *ethhdr;
/* drop packet if it has not necessary minimum size */
@@ -794,12 +856,10 @@ int recv_bat_packet(struct sk_buff *skb, struct batman_if *batman_if)
ethhdr = (struct ethhdr *)skb_mac_header(skb);
- spin_lock_bh(&bat_priv->orig_hash_lock);
receive_aggr_bat_packet(ethhdr,
skb->data,
skb_headlen(skb),
- batman_if);
- spin_unlock_bh(&bat_priv->orig_hash_lock);
+ hard_iface);
kfree_skb(skb);
return NET_RX_SUCCESS;
@@ -808,135 +868,144 @@ int recv_bat_packet(struct sk_buff *skb, struct batman_if *batman_if)
static int recv_my_icmp_packet(struct bat_priv *bat_priv,
struct sk_buff *skb, size_t icmp_len)
{
- struct orig_node *orig_node;
+ struct orig_node *orig_node = NULL;
+ struct neigh_node *neigh_node = NULL;
struct icmp_packet_rr *icmp_packet;
- struct ethhdr *ethhdr;
- struct batman_if *batman_if;
- int ret;
- uint8_t dstaddr[ETH_ALEN];
+ int ret = NET_RX_DROP;
icmp_packet = (struct icmp_packet_rr *)skb->data;
- ethhdr = (struct ethhdr *)skb_mac_header(skb);
/* add data to device queue */
if (icmp_packet->msg_type != ECHO_REQUEST) {
bat_socket_receive_packet(icmp_packet, icmp_len);
- return NET_RX_DROP;
+ goto out;
}
if (!bat_priv->primary_if)
- return NET_RX_DROP;
+ goto out;
/* answer echo request (ping) */
/* get routing information */
- spin_lock_bh(&bat_priv->orig_hash_lock);
- orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
- compare_orig, choose_orig,
- icmp_packet->orig));
- ret = NET_RX_DROP;
-
- if ((orig_node) && (orig_node->router)) {
-
- /* don't lock while sending the packets ... we therefore
- * copy the required data before sending */
- batman_if = orig_node->router->if_incoming;
- memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
- spin_unlock_bh(&bat_priv->orig_hash_lock);
-
- /* create a copy of the skb, if needed, to modify it. */
- if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
- return NET_RX_DROP;
+ rcu_read_lock();
+ orig_node = orig_hash_find(bat_priv, icmp_packet->orig);
- icmp_packet = (struct icmp_packet_rr *)skb->data;
- ethhdr = (struct ethhdr *)skb_mac_header(skb);
+ if (!orig_node)
+ goto unlock;
- memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
- memcpy(icmp_packet->orig,
- bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
- icmp_packet->msg_type = ECHO_REPLY;
- icmp_packet->ttl = TTL;
+ neigh_node = orig_node->router;
- send_skb_packet(skb, batman_if, dstaddr);
- ret = NET_RX_SUCCESS;
+ if (!neigh_node)
+ goto unlock;
- } else
- spin_unlock_bh(&bat_priv->orig_hash_lock);
+ if (!atomic_inc_not_zero(&neigh_node->refcount)) {
+ neigh_node = NULL;
+ goto unlock;
+ }
+
+ rcu_read_unlock();
+
+ /* create a copy of the skb, if needed, to modify it. */
+ if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
+ goto out;
+
+ icmp_packet = (struct icmp_packet_rr *)skb->data;
+
+ memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
+ memcpy(icmp_packet->orig,
+ bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+ icmp_packet->msg_type = ECHO_REPLY;
+ icmp_packet->ttl = TTL;
+ send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
+ ret = NET_RX_SUCCESS;
+ goto out;
+
+unlock:
+ rcu_read_unlock();
+out:
+ if (neigh_node)
+ neigh_node_free_ref(neigh_node);
+ if (orig_node)
+ orig_node_free_ref(orig_node);
return ret;
}
static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
- struct sk_buff *skb, size_t icmp_len)
+ struct sk_buff *skb)
{
- struct orig_node *orig_node;
+ struct orig_node *orig_node = NULL;
+ struct neigh_node *neigh_node = NULL;
struct icmp_packet *icmp_packet;
- struct ethhdr *ethhdr;
- struct batman_if *batman_if;
- int ret;
- uint8_t dstaddr[ETH_ALEN];
+ int ret = NET_RX_DROP;
icmp_packet = (struct icmp_packet *)skb->data;
- ethhdr = (struct ethhdr *)skb_mac_header(skb);
/* 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);
- return NET_RX_DROP;
+ goto out;
}
if (!bat_priv->primary_if)
- return NET_RX_DROP;
+ goto out;
/* get routing information */
- spin_lock_bh(&bat_priv->orig_hash_lock);
- orig_node = ((struct orig_node *)
- hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
- icmp_packet->orig));
- ret = NET_RX_DROP;
-
- if ((orig_node) && (orig_node->router)) {
-
- /* don't lock while sending the packets ... we therefore
- * copy the required data before sending */
- batman_if = orig_node->router->if_incoming;
- memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
- spin_unlock_bh(&bat_priv->orig_hash_lock);
-
- /* create a copy of the skb, if needed, to modify it. */
- if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
- return NET_RX_DROP;
+ rcu_read_lock();
+ orig_node = orig_hash_find(bat_priv, icmp_packet->orig);
- icmp_packet = (struct icmp_packet *) skb->data;
- ethhdr = (struct ethhdr *)skb_mac_header(skb);
+ if (!orig_node)
+ goto unlock;
- memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
- memcpy(icmp_packet->orig,
- bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
- icmp_packet->msg_type = TTL_EXCEEDED;
- icmp_packet->ttl = TTL;
+ neigh_node = orig_node->router;
- send_skb_packet(skb, batman_if, dstaddr);
- ret = NET_RX_SUCCESS;
+ if (!neigh_node)
+ goto unlock;
- } else
- spin_unlock_bh(&bat_priv->orig_hash_lock);
+ if (!atomic_inc_not_zero(&neigh_node->refcount)) {
+ neigh_node = NULL;
+ goto unlock;
+ }
+ rcu_read_unlock();
+
+ /* create a copy of the skb, if needed, to modify it. */
+ if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
+ goto out;
+
+ icmp_packet = (struct icmp_packet *)skb->data;
+
+ memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
+ memcpy(icmp_packet->orig,
+ bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+ icmp_packet->msg_type = TTL_EXCEEDED;
+ icmp_packet->ttl = TTL;
+
+ send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
+ ret = NET_RX_SUCCESS;
+ goto out;
+
+unlock:
+ rcu_read_unlock();
+out:
+ if (neigh_node)
+ neigh_node_free_ref(neigh_node);
+ if (orig_node)
+ orig_node_free_ref(orig_node);
return ret;
}
-int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if)
+int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if)
{
struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
struct icmp_packet_rr *icmp_packet;
struct ethhdr *ethhdr;
- struct orig_node *orig_node;
- struct batman_if *batman_if;
+ struct orig_node *orig_node = NULL;
+ struct neigh_node *neigh_node = NULL;
int hdr_size = sizeof(struct icmp_packet);
- int ret;
- uint8_t dstaddr[ETH_ALEN];
+ int ret = NET_RX_DROP;
/**
* we truncate all incoming icmp packets if they don't match our size
@@ -946,21 +1015,21 @@ int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if)
/* drop packet if it has not necessary minimum size */
if (unlikely(!pskb_may_pull(skb, hdr_size)))
- return NET_RX_DROP;
+ goto out;
ethhdr = (struct ethhdr *)skb_mac_header(skb);
/* packet with unicast indication but broadcast recipient */
if (is_broadcast_ether_addr(ethhdr->h_dest))
- return NET_RX_DROP;
+ goto out;
/* packet with broadcast sender address */
if (is_broadcast_ether_addr(ethhdr->h_source))
- return NET_RX_DROP;
+ goto out;
/* not for me */
if (!is_my_mac(ethhdr->h_dest))
- return NET_RX_DROP;
+ goto out;
icmp_packet = (struct icmp_packet_rr *)skb->data;
@@ -978,53 +1047,61 @@ int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if)
/* TTL exceeded */
if (icmp_packet->ttl < 2)
- return recv_icmp_ttl_exceeded(bat_priv, skb, hdr_size);
-
- ret = NET_RX_DROP;
+ return recv_icmp_ttl_exceeded(bat_priv, skb);
/* get routing information */
- spin_lock_bh(&bat_priv->orig_hash_lock);
- orig_node = ((struct orig_node *)
- hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
- icmp_packet->dst));
+ rcu_read_lock();
+ orig_node = orig_hash_find(bat_priv, icmp_packet->dst);
- if ((orig_node) && (orig_node->router)) {
+ if (!orig_node)
+ goto unlock;
- /* don't lock while sending the packets ... we therefore
- * copy the required data before sending */
- batman_if = orig_node->router->if_incoming;
- memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
- spin_unlock_bh(&bat_priv->orig_hash_lock);
+ neigh_node = orig_node->router;
- /* create a copy of the skb, if needed, to modify it. */
- if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
- return NET_RX_DROP;
+ if (!neigh_node)
+ goto unlock;
- icmp_packet = (struct icmp_packet_rr *)skb->data;
- ethhdr = (struct ethhdr *)skb_mac_header(skb);
+ if (!atomic_inc_not_zero(&neigh_node->refcount)) {
+ neigh_node = NULL;
+ goto unlock;
+ }
- /* decrement ttl */
- icmp_packet->ttl--;
+ rcu_read_unlock();
- /* route it */
- send_skb_packet(skb, batman_if, dstaddr);
- ret = NET_RX_SUCCESS;
+ /* create a copy of the skb, if needed, to modify it. */
+ if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
+ goto out;
- } else
- spin_unlock_bh(&bat_priv->orig_hash_lock);
+ icmp_packet = (struct icmp_packet_rr *)skb->data;
+
+ /* decrement ttl */
+ icmp_packet->ttl--;
+ /* route it */
+ send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
+ ret = NET_RX_SUCCESS;
+ goto out;
+
+unlock:
+ rcu_read_unlock();
+out:
+ if (neigh_node)
+ neigh_node_free_ref(neigh_node);
+ if (orig_node)
+ orig_node_free_ref(orig_node);
return ret;
}
/* find a suitable router for this originator, and use
- * bonding if possible. */
+ * bonding if possible. increases the found neighbors
+ * refcount.*/
struct neigh_node *find_router(struct bat_priv *bat_priv,
struct orig_node *orig_node,
- struct batman_if *recv_if)
+ struct hard_iface *recv_if)
{
struct orig_node *primary_orig_node;
struct orig_node *router_orig;
- struct neigh_node *router, *first_candidate, *best_router;
+ struct neigh_node *router, *first_candidate, *tmp_neigh_node;
static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
int bonding_enabled;
@@ -1036,78 +1113,128 @@ struct neigh_node *find_router(struct bat_priv *bat_priv,
/* without bonding, the first node should
* always choose the default router. */
-
bonding_enabled = atomic_read(&bat_priv->bonding);
- if ((!recv_if) && (!bonding_enabled))
- return orig_node->router;
-
+ 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)) {
+ rcu_read_unlock();
+ return NULL;
+ }
+
+ 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 (memcmp(router_orig->primary_addr, zero_mac, ETH_ALEN) == 0)
- return orig_node->router;
+ if (compare_eth(router_orig->primary_addr, zero_mac))
+ goto return_router;
/* find the orig_node which has the primary interface. might
* even be the same as our router_orig in many cases */
- if (memcmp(router_orig->primary_addr,
- router_orig->orig, ETH_ALEN) == 0) {
+ if (compare_eth(router_orig->primary_addr, router_orig->orig)) {
primary_orig_node = router_orig;
} else {
- primary_orig_node = hash_find(bat_priv->orig_hash, compare_orig,
- choose_orig,
- router_orig->primary_addr);
-
+ primary_orig_node = orig_hash_find(bat_priv,
+ router_orig->primary_addr);
if (!primary_orig_node)
- return orig_node->router;
+ 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 (primary_orig_node->bond.candidates < 2)
- return orig_node->router;
+ if (atomic_read(&primary_orig_node->bond_candidates) < 2)
+ goto return_router;
/* all nodes between should choose a candidate which
* is is not on the interface where the packet came
* in. */
- first_candidate = primary_orig_node->bond.selected;
- router = first_candidate;
+
+ neigh_node_free_ref(router);
+ first_candidate = NULL;
+ router = NULL;
if (bonding_enabled) {
/* in the bonding case, send the packets in a round
* robin fashion over the remaining interfaces. */
- do {
+
+ list_for_each_entry_rcu(tmp_neigh_node,
+ &primary_orig_node->bond_list, bonding_list) {
+ if (!first_candidate)
+ first_candidate = tmp_neigh_node;
/* recv_if == NULL on the first node. */
- if (router->if_incoming != recv_if)
+ if (tmp_neigh_node->if_incoming != recv_if &&
+ atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
+ 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;
- router = router->next_bond_candidate;
- } while (router != first_candidate);
+ if (!router) {
+ rcu_read_unlock();
+ return NULL;
+ }
- primary_orig_node->bond.selected = router->next_bond_candidate;
+ /* selected should point to the next element
+ * after the current router */
+ spin_lock_bh(&primary_orig_node->neigh_list_lock);
+ /* this is a list_move(), which unfortunately
+ * does not exist as rcu version */
+ list_del_rcu(&primary_orig_node->bond_list);
+ list_add_rcu(&primary_orig_node->bond_list,
+ &router->bonding_list);
+ spin_unlock_bh(&primary_orig_node->neigh_list_lock);
} else {
/* if bonding is disabled, use the best of the
* remaining candidates which are not using
* this interface. */
- best_router = first_candidate;
+ list_for_each_entry_rcu(tmp_neigh_node,
+ &primary_orig_node->bond_list, bonding_list) {
+ if (!first_candidate)
+ first_candidate = tmp_neigh_node;
- do {
/* recv_if == NULL on the first node. */
- if ((router->if_incoming != recv_if) &&
- (router->tq_avg > best_router->tq_avg))
- best_router = router;
+ if (tmp_neigh_node->if_incoming == recv_if)
+ continue;
- router = router->next_bond_candidate;
- } while (router != first_candidate);
+ if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
+ continue;
- router = best_router;
- }
+ /* 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;
+ }
+return_router:
+ rcu_read_unlock();
return router;
}
@@ -1136,17 +1263,14 @@ static int check_unicast_packet(struct sk_buff *skb, int hdr_size)
return 0;
}
-int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if,
- int hdr_size)
+int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
{
struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
- struct orig_node *orig_node;
- struct neigh_node *router;
- struct batman_if *batman_if;
- uint8_t dstaddr[ETH_ALEN];
+ 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;
+ int ret = NET_RX_DROP;
struct sk_buff *new_skb;
unicast_packet = (struct unicast_packet *)skb->data;
@@ -1156,53 +1280,51 @@ int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if,
pr_debug("Warning - can't forward unicast packet from %pM to "
"%pM: ttl exceeded\n", ethhdr->h_source,
unicast_packet->dest);
- return NET_RX_DROP;
+ goto out;
}
/* get routing information */
- spin_lock_bh(&bat_priv->orig_hash_lock);
- orig_node = ((struct orig_node *)
- hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
- unicast_packet->dest));
-
- router = find_router(bat_priv, orig_node, recv_if);
+ rcu_read_lock();
+ orig_node = orig_hash_find(bat_priv, unicast_packet->dest);
- if (!router) {
- spin_unlock_bh(&bat_priv->orig_hash_lock);
- return NET_RX_DROP;
- }
+ if (!orig_node)
+ goto unlock;
- /* don't lock while sending the packets ... we therefore
- * copy the required data before sending */
+ rcu_read_unlock();
- batman_if = router->if_incoming;
- memcpy(dstaddr, router->addr, ETH_ALEN);
+ /* find_router() increases neigh_nodes refcount if found. */
+ neigh_node = find_router(bat_priv, orig_node, recv_if);
- spin_unlock_bh(&bat_priv->orig_hash_lock);
+ if (!neigh_node)
+ goto out;
/* create a copy of the skb, if needed, to modify it. */
if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
- return NET_RX_DROP;
+ goto out;
unicast_packet = (struct unicast_packet *)skb->data;
if (unicast_packet->packet_type == BAT_UNICAST &&
atomic_read(&bat_priv->fragmentation) &&
- skb->len > batman_if->net_dev->mtu)
- return frag_send_skb(skb, bat_priv, batman_if,
- dstaddr);
+ skb->len > neigh_node->if_incoming->net_dev->mtu) {
+ ret = frag_send_skb(skb, bat_priv,
+ neigh_node->if_incoming, neigh_node->addr);
+ goto out;
+ }
if (unicast_packet->packet_type == BAT_UNICAST_FRAG &&
- 2 * skb->len - hdr_size <= batman_if->net_dev->mtu) {
+ frag_can_reassemble(skb, neigh_node->if_incoming->net_dev->mtu)) {
ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
if (ret == NET_RX_DROP)
- return NET_RX_DROP;
+ goto out;
/* packet was buffered for late merge */
- if (!new_skb)
- return NET_RX_SUCCESS;
+ if (!new_skb) {
+ ret = NET_RX_SUCCESS;
+ goto out;
+ }
skb = new_skb;
unicast_packet = (struct unicast_packet *)skb->data;
@@ -1212,12 +1334,21 @@ int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if,
unicast_packet->ttl--;
/* route it */
- send_skb_packet(skb, batman_if, dstaddr);
+ send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
+ ret = NET_RX_SUCCESS;
+ goto out;
- return NET_RX_SUCCESS;
+unlock:
+ rcu_read_unlock();
+out:
+ if (neigh_node)
+ neigh_node_free_ref(neigh_node);
+ if (orig_node)
+ orig_node_free_ref(orig_node);
+ return ret;
}
-int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if)
+int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
{
struct unicast_packet *unicast_packet;
int hdr_size = sizeof(struct unicast_packet);
@@ -1233,10 +1364,10 @@ int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if)
return NET_RX_SUCCESS;
}
- return route_unicast_packet(skb, recv_if, hdr_size);
+ return route_unicast_packet(skb, recv_if);
}
-int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if)
+int recv_ucast_frag_packet(struct sk_buff *skb, struct hard_iface *recv_if)
{
struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
struct unicast_frag_packet *unicast_packet;
@@ -1266,89 +1397,96 @@ int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if)
return NET_RX_SUCCESS;
}
- return route_unicast_packet(skb, recv_if, hdr_size);
+ return route_unicast_packet(skb, recv_if);
}
-int recv_bcast_packet(struct sk_buff *skb, struct batman_if *recv_if)
+int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
{
struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
- struct orig_node *orig_node;
+ struct orig_node *orig_node = NULL;
struct bcast_packet *bcast_packet;
struct ethhdr *ethhdr;
int hdr_size = sizeof(struct bcast_packet);
+ int ret = NET_RX_DROP;
int32_t seq_diff;
/* drop packet if it has not necessary minimum size */
if (unlikely(!pskb_may_pull(skb, hdr_size)))
- return NET_RX_DROP;
+ goto out;
ethhdr = (struct ethhdr *)skb_mac_header(skb);
/* packet with broadcast indication but unicast recipient */
if (!is_broadcast_ether_addr(ethhdr->h_dest))
- return NET_RX_DROP;
+ goto out;
/* packet with broadcast sender address */
if (is_broadcast_ether_addr(ethhdr->h_source))
- return NET_RX_DROP;
+ goto out;
/* ignore broadcasts sent by myself */
if (is_my_mac(ethhdr->h_source))
- return NET_RX_DROP;
+ goto out;
bcast_packet = (struct bcast_packet *)skb->data;
/* ignore broadcasts originated by myself */
if (is_my_mac(bcast_packet->orig))
- return NET_RX_DROP;
+ goto out;
if (bcast_packet->ttl < 2)
- return NET_RX_DROP;
+ goto out;
- spin_lock_bh(&bat_priv->orig_hash_lock);
- orig_node = ((struct orig_node *)
- hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
- bcast_packet->orig));
+ rcu_read_lock();
+ orig_node = orig_hash_find(bat_priv, bcast_packet->orig);
- if (!orig_node) {
- spin_unlock_bh(&bat_priv->orig_hash_lock);
- return NET_RX_DROP;
- }
+ if (!orig_node)
+ goto rcu_unlock;
+
+ rcu_read_unlock();
+
+ spin_lock_bh(&orig_node->bcast_seqno_lock);
/* check whether the packet is a duplicate */
- if (get_bit_status(orig_node->bcast_bits,
- orig_node->last_bcast_seqno,
- ntohl(bcast_packet->seqno))) {
- spin_unlock_bh(&bat_priv->orig_hash_lock);
- return NET_RX_DROP;
- }
+ if (get_bit_status(orig_node->bcast_bits, orig_node->last_bcast_seqno,
+ ntohl(bcast_packet->seqno)))
+ goto spin_unlock;
seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
/* check whether the packet is old and the host just restarted. */
if (window_protected(bat_priv, seq_diff,
- &orig_node->bcast_seqno_reset)) {
- spin_unlock_bh(&bat_priv->orig_hash_lock);
- return NET_RX_DROP;
- }
+ &orig_node->bcast_seqno_reset))
+ goto spin_unlock;
/* mark broadcast in flood history, update window position
* if required. */
if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
- spin_unlock_bh(&bat_priv->orig_hash_lock);
+ spin_unlock_bh(&orig_node->bcast_seqno_lock);
+
/* rebroadcast packet */
add_bcast_packet_to_list(bat_priv, skb);
/* broadcast for me */
interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
+ ret = NET_RX_SUCCESS;
+ goto out;
- return NET_RX_SUCCESS;
+rcu_unlock:
+ rcu_read_unlock();
+ goto out;
+spin_unlock:
+ spin_unlock_bh(&orig_node->bcast_seqno_lock);
+out:
+ if (orig_node)
+ orig_node_free_ref(orig_node);
+ return ret;
}
-int recv_vis_packet(struct sk_buff *skb, struct batman_if *recv_if)
+int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if)
{
struct vis_packet *vis_packet;
struct ethhdr *ethhdr;