/*
- * Copyright (c) 2008 open80211s Ltd.
+ * Copyright (c) 2008, 2009 open80211s Ltd.
* Author: Luis Carlos Cobo <luisca@cozybit.com>
*
* This program is free software; you can redistribute it and/or modify
};
static struct mesh_table *mesh_paths;
+static struct mesh_table *mpp_paths; /* Store paths for MPP&MAP */
+
+int mesh_paths_generation;
+static void __mesh_table_free(struct mesh_table *tbl)
+{
+ kfree(tbl->hash_buckets);
+ kfree(tbl->hashwlock);
+ kfree(tbl);
+}
+
+void mesh_table_free(struct mesh_table *tbl, bool free_leafs)
+{
+ struct hlist_head *mesh_hash;
+ struct hlist_node *p, *q;
+ int i;
+
+ mesh_hash = tbl->hash_buckets;
+ for (i = 0; i <= tbl->hash_mask; i++) {
+ spin_lock(&tbl->hashwlock[i]);
+ hlist_for_each_safe(p, q, &mesh_hash[i]) {
+ tbl->free_node(p, free_leafs);
+ atomic_dec(&tbl->entries);
+ }
+ spin_unlock(&tbl->hashwlock[i]);
+ }
+ __mesh_table_free(tbl);
+}
+
+static struct mesh_table *mesh_table_grow(struct mesh_table *tbl)
+{
+ struct mesh_table *newtbl;
+ struct hlist_head *oldhash;
+ struct hlist_node *p, *q;
+ int i;
+
+ if (atomic_read(&tbl->entries)
+ < tbl->mean_chain_len * (tbl->hash_mask + 1))
+ goto endgrow;
+
+ newtbl = mesh_table_alloc(tbl->size_order + 1);
+ if (!newtbl)
+ goto endgrow;
+
+ newtbl->free_node = tbl->free_node;
+ newtbl->mean_chain_len = tbl->mean_chain_len;
+ newtbl->copy_node = tbl->copy_node;
+ atomic_set(&newtbl->entries, atomic_read(&tbl->entries));
+
+ oldhash = tbl->hash_buckets;
+ for (i = 0; i <= tbl->hash_mask; i++)
+ hlist_for_each(p, &oldhash[i])
+ if (tbl->copy_node(p, newtbl) < 0)
+ goto errcopy;
+
+ return newtbl;
+
+errcopy:
+ for (i = 0; i <= newtbl->hash_mask; i++) {
+ hlist_for_each_safe(p, q, &newtbl->hash_buckets[i])
+ tbl->free_node(p, 0);
+ }
+ __mesh_table_free(newtbl);
+endgrow:
+ return NULL;
+}
+
/* This lock will have the grow table function as writer and add / delete nodes
* as readers. When reading the table (i.e. doing lookups) we are well protected
*/
void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta)
{
+ struct sk_buff *skb;
+ struct ieee80211_hdr *hdr;
+ struct sk_buff_head tmpq;
+ unsigned long flags;
+
rcu_assign_pointer(mpath->next_hop, sta);
+
+ __skb_queue_head_init(&tmpq);
+
+ spin_lock_irqsave(&mpath->frame_queue.lock, flags);
+
+ while ((skb = __skb_dequeue(&mpath->frame_queue)) != NULL) {
+ hdr = (struct ieee80211_hdr *) skb->data;
+ memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
+ __skb_queue_tail(&tmpq, skb);
+ }
+
+ skb_queue_splice(&tmpq, &mpath->frame_queue);
+ spin_unlock_irqrestore(&mpath->frame_queue.lock, flags);
}
return NULL;
}
+struct mesh_path *mpp_path_lookup(u8 *dst, struct ieee80211_sub_if_data *sdata)
+{
+ struct mesh_path *mpath;
+ struct hlist_node *n;
+ struct hlist_head *bucket;
+ struct mesh_table *tbl;
+ struct mpath_node *node;
+
+ tbl = rcu_dereference(mpp_paths);
+
+ bucket = &tbl->hash_buckets[mesh_table_hash(dst, sdata, tbl)];
+ hlist_for_each_entry_rcu(node, n, bucket, list) {
+ mpath = node->mpath;
+ if (mpath->sdata == sdata &&
+ memcmp(dst, mpath->dst, ETH_ALEN) == 0) {
+ if (MPATH_EXPIRED(mpath)) {
+ spin_lock_bh(&mpath->state_lock);
+ if (MPATH_EXPIRED(mpath))
+ mpath->flags &= ~MESH_PATH_ACTIVE;
+ spin_unlock_bh(&mpath->state_lock);
+ }
+ return mpath;
+ }
+ }
+ return NULL;
+}
+
+
/**
* mesh_path_lookup_by_idx - look up a path in the mesh path table by its index
* @idx: index
*/
int mesh_path_add(u8 *dst, struct ieee80211_sub_if_data *sdata)
{
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ struct ieee80211_local *local = sdata->local;
struct mesh_path *mpath, *new_mpath;
struct mpath_node *node, *new_node;
struct hlist_head *bucket;
return -ENOSPC;
err = -ENOMEM;
- new_mpath = kzalloc(sizeof(struct mesh_path), GFP_KERNEL);
+ new_mpath = kzalloc(sizeof(struct mesh_path), GFP_ATOMIC);
if (!new_mpath)
goto err_path_alloc;
- new_node = kmalloc(sizeof(struct mpath_node), GFP_KERNEL);
+ new_node = kmalloc(sizeof(struct mpath_node), GFP_ATOMIC);
if (!new_node)
goto err_node_alloc;
mesh_paths->mean_chain_len * (mesh_paths->hash_mask + 1))
grow = 1;
+ mesh_paths_generation++;
+
spin_unlock(&mesh_paths->hashwlock[hash_idx]);
read_unlock(&pathtbl_resize_lock);
if (grow) {
- struct mesh_table *oldtbl, *newtbl;
-
- write_lock(&pathtbl_resize_lock);
- oldtbl = mesh_paths;
- newtbl = mesh_table_grow(mesh_paths);
- if (!newtbl) {
- write_unlock(&pathtbl_resize_lock);
- return 0;
- }
- rcu_assign_pointer(mesh_paths, newtbl);
- write_unlock(&pathtbl_resize_lock);
-
- synchronize_rcu();
- mesh_table_free(oldtbl, false);
+ set_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags);
+ ieee80211_queue_work(&local->hw, &ifmsh->work);
}
return 0;
return err;
}
+void mesh_mpath_table_grow(void)
+{
+ struct mesh_table *oldtbl, *newtbl;
+
+ write_lock(&pathtbl_resize_lock);
+ oldtbl = mesh_paths;
+ newtbl = mesh_table_grow(mesh_paths);
+ if (!newtbl) {
+ write_unlock(&pathtbl_resize_lock);
+ return;
+ }
+ rcu_assign_pointer(mesh_paths, newtbl);
+ write_unlock(&pathtbl_resize_lock);
+
+ synchronize_rcu();
+ mesh_table_free(oldtbl, false);
+}
+
+void mesh_mpp_table_grow(void)
+{
+ struct mesh_table *oldtbl, *newtbl;
+
+ write_lock(&pathtbl_resize_lock);
+ oldtbl = mpp_paths;
+ newtbl = mesh_table_grow(mpp_paths);
+ if (!newtbl) {
+ write_unlock(&pathtbl_resize_lock);
+ return;
+ }
+ rcu_assign_pointer(mpp_paths, newtbl);
+ write_unlock(&pathtbl_resize_lock);
+
+ synchronize_rcu();
+ mesh_table_free(oldtbl, false);
+}
+
+int mpp_path_add(u8 *dst, u8 *mpp, struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+ struct ieee80211_local *local = sdata->local;
+ struct mesh_path *mpath, *new_mpath;
+ struct mpath_node *node, *new_node;
+ struct hlist_head *bucket;
+ struct hlist_node *n;
+ int grow = 0;
+ int err = 0;
+ u32 hash_idx;
+
+ if (memcmp(dst, sdata->dev->dev_addr, ETH_ALEN) == 0)
+ /* never add ourselves as neighbours */
+ return -ENOTSUPP;
+
+ if (is_multicast_ether_addr(dst))
+ return -ENOTSUPP;
+
+ err = -ENOMEM;
+ new_mpath = kzalloc(sizeof(struct mesh_path), GFP_ATOMIC);
+ if (!new_mpath)
+ goto err_path_alloc;
+
+ new_node = kmalloc(sizeof(struct mpath_node), GFP_ATOMIC);
+ if (!new_node)
+ goto err_node_alloc;
+
+ read_lock(&pathtbl_resize_lock);
+ memcpy(new_mpath->dst, dst, ETH_ALEN);
+ memcpy(new_mpath->mpp, mpp, ETH_ALEN);
+ new_mpath->sdata = sdata;
+ new_mpath->flags = 0;
+ skb_queue_head_init(&new_mpath->frame_queue);
+ new_node->mpath = new_mpath;
+ new_mpath->exp_time = jiffies;
+ spin_lock_init(&new_mpath->state_lock);
+
+ hash_idx = mesh_table_hash(dst, sdata, mpp_paths);
+ bucket = &mpp_paths->hash_buckets[hash_idx];
+
+ spin_lock(&mpp_paths->hashwlock[hash_idx]);
+
+ err = -EEXIST;
+ hlist_for_each_entry(node, n, bucket, list) {
+ mpath = node->mpath;
+ if (mpath->sdata == sdata && memcmp(dst, mpath->dst, ETH_ALEN) == 0)
+ goto err_exists;
+ }
+
+ hlist_add_head_rcu(&new_node->list, bucket);
+ if (atomic_inc_return(&mpp_paths->entries) >=
+ mpp_paths->mean_chain_len * (mpp_paths->hash_mask + 1))
+ grow = 1;
+
+ spin_unlock(&mpp_paths->hashwlock[hash_idx]);
+ read_unlock(&pathtbl_resize_lock);
+ if (grow) {
+ set_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags);
+ ieee80211_queue_work(&local->hw, &ifmsh->work);
+ }
+ return 0;
+
+err_exists:
+ spin_unlock(&mpp_paths->hashwlock[hash_idx]);
+ read_unlock(&pathtbl_resize_lock);
+ kfree(new_node);
+err_node_alloc:
+ kfree(new_mpath);
+err_path_alloc:
+ return err;
+}
+
/**
* mesh_plink_broken - deactivates paths and sends perr when a link breaks
*/
void mesh_plink_broken(struct sta_info *sta)
{
+ static const u8 bcast[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
struct mesh_path *mpath;
struct mpath_node *node;
struct hlist_node *p;
mpath->flags & MESH_PATH_ACTIVE &&
!(mpath->flags & MESH_PATH_FIXED)) {
mpath->flags &= ~MESH_PATH_ACTIVE;
- ++mpath->dsn;
+ ++mpath->sn;
spin_unlock_bh(&mpath->state_lock);
- mesh_path_error_tx(mpath->dst,
- cpu_to_le32(mpath->dsn),
- sdata->dev->broadcast, sdata);
+ mesh_path_error_tx(MESH_TTL, mpath->dst,
+ cpu_to_le32(mpath->sn),
+ PERR_RCODE_DEST_UNREACH,
+ bcast, sdata);
} else
spin_unlock_bh(&mpath->state_lock);
}
err = -ENXIO;
enddel:
+ mesh_paths_generation++;
spin_unlock(&mesh_paths->hashwlock[hash_idx]);
read_unlock(&pathtbl_resize_lock);
return err;
*/
void mesh_path_tx_pending(struct mesh_path *mpath)
{
- struct sk_buff *skb;
-
- while ((skb = skb_dequeue(&mpath->frame_queue)) &&
- (mpath->flags & MESH_PATH_ACTIVE))
- dev_queue_xmit(skb);
+ if (mpath->flags & MESH_PATH_ACTIVE)
+ ieee80211_add_pending_skbs(mpath->sdata->local,
+ &mpath->frame_queue);
}
/**
* @skb: frame to discard
* @sdata: network subif the frame was to be sent through
*
- * If the frame was beign forwarded from another MP, a PERR frame will be sent
- * to the precursor.
+ * If the frame was being forwarded from another MP, a PERR frame will be sent
+ * to the precursor. The precursor's address (i.e. the previous hop) was saved
+ * in addr1 of the frame-to-be-forwarded, and would only be overwritten once
+ * the destination is successfully resolved.
*
* Locking: the function must me called within a rcu_read_lock region
*/
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
struct mesh_path *mpath;
- u32 dsn = 0;
+ u32 sn = 0;
if (memcmp(hdr->addr4, sdata->dev->dev_addr, ETH_ALEN) != 0) {
u8 *ra, *da;
da = hdr->addr3;
- ra = hdr->addr2;
+ ra = hdr->addr1;
mpath = mesh_path_lookup(da, sdata);
if (mpath)
- dsn = ++mpath->dsn;
- mesh_path_error_tx(skb->data, cpu_to_le32(dsn), ra, sdata);
+ sn = ++mpath->sn;
+ mesh_path_error_tx(MESH_TTL, skb->data, cpu_to_le32(sn),
+ PERR_RCODE_NO_ROUTE, ra, sdata);
}
kfree_skb(skb);
{
spin_lock_bh(&mpath->state_lock);
mesh_path_assign_nexthop(mpath, next_hop);
- mpath->dsn = 0xffff;
+ mpath->sn = 0xffff;
mpath->metric = 0;
mpath->hop_count = 0;
mpath->exp_time = 0;
int mesh_pathtbl_init(void)
{
mesh_paths = mesh_table_alloc(INIT_PATHS_SIZE_ORDER);
+ if (!mesh_paths)
+ return -ENOMEM;
mesh_paths->free_node = &mesh_path_node_free;
mesh_paths->copy_node = &mesh_path_node_copy;
mesh_paths->mean_chain_len = MEAN_CHAIN_LEN;
- if (!mesh_paths)
+
+ mpp_paths = mesh_table_alloc(INIT_PATHS_SIZE_ORDER);
+ if (!mpp_paths) {
+ mesh_table_free(mesh_paths, true);
return -ENOMEM;
+ }
+ mpp_paths->free_node = &mesh_path_node_free;
+ mpp_paths->copy_node = &mesh_path_node_copy;
+ mpp_paths->mean_chain_len = MEAN_CHAIN_LEN;
+
return 0;
}
void mesh_pathtbl_unregister(void)
{
mesh_table_free(mesh_paths, true);
+ mesh_table_free(mpp_paths, true);
}