| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (c) 2008, 2009 open80211s Ltd. |
| * Author: Luis Carlos Cobo <luisca@cozybit.com> |
| */ |
| |
| #include <linux/etherdevice.h> |
| #include <linux/list.h> |
| #include <linux/random.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/string.h> |
| #include <net/mac80211.h> |
| #include "wme.h" |
| #include "ieee80211_i.h" |
| #include "mesh.h" |
| #include "driver-ops.h" |
| #include <linux/rhashtable.h> |
| |
| static void mesh_path_free_rcu(struct mesh_table *tbl, struct mesh_path *mpath); |
| |
| static u32 mesh_table_hash(const void *addr, u32 len, u32 seed) |
| { |
| /* Use last four bytes of hw addr as hash index */ |
| return jhash_1word(__get_unaligned_cpu32((u8 *)addr + 2), seed); |
| } |
| |
| static const struct rhashtable_params mesh_rht_params = { |
| .nelem_hint = 2, |
| .automatic_shrinking = true, |
| .key_len = ETH_ALEN, |
| .key_offset = offsetof(struct mesh_path, dst), |
| .head_offset = offsetof(struct mesh_path, rhash), |
| .hashfn = mesh_table_hash, |
| }; |
| |
| static const struct rhashtable_params mesh_hdr_rht_params = { |
| .nelem_hint = 10, |
| .automatic_shrinking = true, |
| .key_len = ETH_ALEN, |
| .key_offset = offsetof(struct mhdr_cache_entry, addr_key), |
| .head_offset = offsetof(struct mhdr_cache_entry, rhash), |
| .hashfn = mesh_table_hash, |
| }; |
| |
| static void mesh_hdr_cache_entry_free(void *ptr, void *tblptr) |
| { |
| struct mhdr_cache_entry *mhdr = ptr; |
| |
| kfree_rcu(mhdr, rcu); |
| } |
| |
| static void mesh_hdr_cache_deinit(struct ieee80211_sub_if_data *sdata) |
| { |
| struct mesh_hdr_cache *cache; |
| |
| cache = sdata->u.mesh.hdr_cache; |
| |
| if (!cache) |
| return; |
| |
| rhashtable_free_and_destroy(&cache->rhead, |
| mesh_hdr_cache_entry_free, NULL); |
| |
| kfree(sdata->u.mesh.hdr_cache); |
| sdata->u.mesh.hdr_cache = NULL; |
| } |
| |
| static void mesh_hdr_cache_init(struct ieee80211_sub_if_data *sdata) |
| { |
| struct ieee80211_local *local = sdata->local; |
| struct mesh_hdr_cache *cache; |
| |
| sdata->u.mesh.hdr_cache = NULL; |
| |
| if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) |
| return; |
| |
| if (ieee80211_hw_check(&local->hw, SUPPORTS_NSS_OFFLOAD)) |
| return; |
| |
| cache = kmalloc(sizeof(struct mesh_hdr_cache), GFP_ATOMIC); |
| |
| if (!cache) |
| return; |
| |
| sdata->u.mesh.hdr_cache = cache; |
| rhashtable_init(&cache->rhead, &mesh_hdr_rht_params); |
| INIT_HLIST_HEAD(&cache->walk_head); |
| spin_lock_init(&cache->walk_lock); |
| atomic_set(&cache->size, 0); |
| } |
| |
| static inline bool mpath_expired(struct mesh_path *mpath) |
| { |
| return (mpath->flags & MESH_PATH_ACTIVE) && |
| time_after(jiffies, mpath->exp_time) && |
| !(mpath->flags & MESH_PATH_FIXED); |
| } |
| |
| static void mesh_path_rht_free(void *ptr, void *tblptr) |
| { |
| struct mesh_path *mpath = ptr; |
| struct mesh_table *tbl = tblptr; |
| |
| mesh_path_free_rcu(tbl, mpath); |
| } |
| |
| static struct mesh_table *mesh_table_alloc(void) |
| { |
| struct mesh_table *newtbl; |
| |
| newtbl = kmalloc(sizeof(struct mesh_table), GFP_ATOMIC); |
| if (!newtbl) |
| return NULL; |
| |
| INIT_HLIST_HEAD(&newtbl->known_gates); |
| INIT_HLIST_HEAD(&newtbl->walk_head); |
| atomic_set(&newtbl->entries, 0); |
| spin_lock_init(&newtbl->gates_lock); |
| spin_lock_init(&newtbl->walk_lock); |
| rhashtable_init(&newtbl->rhead, &mesh_rht_params); |
| |
| return newtbl; |
| } |
| |
| static void mesh_table_free(struct mesh_table *tbl) |
| { |
| rhashtable_free_and_destroy(&tbl->rhead, |
| mesh_path_rht_free, tbl); |
| kfree(tbl); |
| } |
| |
| void mesh_nss_offld_path_update(struct mesh_path *mpath, bool is_mpath) |
| { |
| struct ieee80211_mesh_path_offld path = {0}; |
| struct sta_info *next_hop; |
| struct ieee80211_sub_if_data *sdata = mpath->sdata; |
| |
| |
| path.metric = mpath->metric; |
| if (time_before(jiffies, mpath->exp_time)) |
| path.exp_time = jiffies_to_msecs(mpath->exp_time - jiffies); |
| |
| path.hop_count = mpath->hop_count; |
| path.flags = mpath->flags; |
| path.mesh_gate = mpath->is_gate; |
| if (is_mpath) { |
| ether_addr_copy(path.mesh_da, mpath->dst); |
| } else { |
| ether_addr_copy(path.mesh_da, mpath->mpp); |
| ether_addr_copy(path.da, mpath->dst); |
| } |
| |
| next_hop = rcu_dereference(mpath->next_hop); |
| if (next_hop) |
| ether_addr_copy(path.next_hop, next_hop->addr); |
| |
| drv_config_mesh_offload_path(sdata->local, sdata, |
| is_mpath ? IEEE80211_MESH_PATH_OFFLD_CMD_UPDATE_MPATH : |
| IEEE80211_MESH_PATH_OFFLD_CMD_UPDATE_MPP, |
| &path); |
| } |
| |
| /** |
| * mesh_path_assign_nexthop - update mesh path next hop |
| * |
| * @mpath: mesh path to update |
| * @sta: next hop to assign |
| * |
| * Locking: mpath->state_lock must be held when calling this function |
| */ |
| void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta) |
| { |
| struct sk_buff *skb; |
| struct ieee80211_hdr *hdr; |
| unsigned long flags; |
| |
| rcu_assign_pointer(mpath->next_hop, sta); |
| |
| spin_lock_irqsave(&mpath->frame_queue.lock, flags); |
| skb_queue_walk(&mpath->frame_queue, skb) { |
| hdr = (struct ieee80211_hdr *) skb->data; |
| memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); |
| memcpy(hdr->addr2, mpath->sdata->vif.addr, ETH_ALEN); |
| ieee80211_mps_set_frame_flags(sta->sdata, sta, hdr); |
| } |
| |
| spin_unlock_irqrestore(&mpath->frame_queue.lock, flags); |
| } |
| |
| static void prepare_for_gate(struct sk_buff *skb, char *dst_addr, |
| struct mesh_path *gate_mpath) |
| { |
| struct ieee80211_hdr *hdr; |
| struct ieee80211s_hdr *mshdr; |
| int mesh_hdrlen, hdrlen; |
| char *next_hop; |
| |
| hdr = (struct ieee80211_hdr *) skb->data; |
| hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); |
| |
| if (!(mshdr->flags & MESH_FLAGS_AE)) { |
| /* size of the fixed part of the mesh header */ |
| mesh_hdrlen = 6; |
| |
| /* make room for the two extended addresses */ |
| skb_push(skb, 2 * ETH_ALEN); |
| memmove(skb->data, hdr, hdrlen + mesh_hdrlen); |
| |
| hdr = (struct ieee80211_hdr *) skb->data; |
| |
| /* we preserve the previous mesh header and only add |
| * the new addreses */ |
| mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); |
| mshdr->flags = MESH_FLAGS_AE_A5_A6; |
| memcpy(mshdr->eaddr1, hdr->addr3, ETH_ALEN); |
| memcpy(mshdr->eaddr2, hdr->addr4, ETH_ALEN); |
| } |
| |
| /* update next hop */ |
| hdr = (struct ieee80211_hdr *) skb->data; |
| rcu_read_lock(); |
| next_hop = rcu_dereference(gate_mpath->next_hop)->sta.addr; |
| memcpy(hdr->addr1, next_hop, ETH_ALEN); |
| rcu_read_unlock(); |
| memcpy(hdr->addr2, gate_mpath->sdata->vif.addr, ETH_ALEN); |
| memcpy(hdr->addr3, dst_addr, ETH_ALEN); |
| } |
| |
| /** |
| * mesh_path_move_to_queue - Move or copy frames from one mpath queue to another |
| * |
| * This function is used to transfer or copy frames from an unresolved mpath to |
| * a gate mpath. The function also adds the Address Extension field and |
| * updates the next hop. |
| * |
| * If a frame already has an Address Extension field, only the next hop and |
| * destination addresses are updated. |
| * |
| * The gate mpath must be an active mpath with a valid mpath->next_hop. |
| * |
| * @gate_mpath: An active mpath the frames will be sent to (i.e. the gate) |
| * @from_mpath: The failed mpath |
| * @copy: When true, copy all the frames to the new mpath queue. When false, |
| * move them. |
| */ |
| static void mesh_path_move_to_queue(struct mesh_path *gate_mpath, |
| struct mesh_path *from_mpath, |
| bool copy) |
| { |
| struct sk_buff *skb, *fskb, *tmp; |
| struct sk_buff_head failq; |
| unsigned long flags; |
| |
| if (WARN_ON(gate_mpath == from_mpath)) |
| return; |
| if (WARN_ON(!gate_mpath->next_hop)) |
| return; |
| |
| __skb_queue_head_init(&failq); |
| |
| spin_lock_irqsave(&from_mpath->frame_queue.lock, flags); |
| skb_queue_splice_init(&from_mpath->frame_queue, &failq); |
| spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags); |
| |
| skb_queue_walk_safe(&failq, fskb, tmp) { |
| if (skb_queue_len(&gate_mpath->frame_queue) >= |
| MESH_FRAME_QUEUE_LEN) { |
| mpath_dbg(gate_mpath->sdata, "mpath queue full!\n"); |
| break; |
| } |
| |
| skb = skb_copy(fskb, GFP_ATOMIC); |
| if (WARN_ON(!skb)) |
| break; |
| |
| prepare_for_gate(skb, gate_mpath->dst, gate_mpath); |
| skb_queue_tail(&gate_mpath->frame_queue, skb); |
| |
| if (copy) |
| continue; |
| |
| __skb_unlink(fskb, &failq); |
| kfree_skb(fskb); |
| } |
| |
| mpath_dbg(gate_mpath->sdata, "Mpath queue for gate %pM has %d frames\n", |
| gate_mpath->dst, skb_queue_len(&gate_mpath->frame_queue)); |
| |
| if (!copy) |
| return; |
| |
| spin_lock_irqsave(&from_mpath->frame_queue.lock, flags); |
| skb_queue_splice(&failq, &from_mpath->frame_queue); |
| spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags); |
| } |
| |
| |
| static struct mesh_path *mpath_lookup(struct mesh_table *tbl, const u8 *dst, |
| struct ieee80211_sub_if_data *sdata, |
| bool is_mpath) |
| { |
| struct mesh_path *mpath; |
| bool update; |
| |
| mpath = rhashtable_lookup(&tbl->rhead, dst, mesh_rht_params); |
| |
| if (mpath && mpath_expired(mpath)) { |
| spin_lock_bh(&mpath->state_lock); |
| update = !!(mpath->flags & MESH_PATH_ACTIVE); |
| mpath->flags &= ~MESH_PATH_ACTIVE; |
| spin_unlock_bh(&mpath->state_lock); |
| if (update && is_mpath) |
| mesh_nss_offld_path_update(mpath, true); |
| } |
| return mpath; |
| } |
| |
| /** |
| * mesh_path_lookup - look up a path in the mesh path table |
| * @sdata: local subif |
| * @dst: hardware address (ETH_ALEN length) of destination |
| * |
| * Returns: pointer to the mesh path structure, or NULL if not found |
| * |
| * Locking: must be called within a read rcu section. |
| */ |
| struct mesh_path * |
| mesh_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst) |
| { |
| return mpath_lookup(sdata->u.mesh.mesh_paths, dst, sdata, true); |
| } |
| |
| struct mesh_path * |
| mpp_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst) |
| { |
| return mpath_lookup(sdata->u.mesh.mpp_paths, dst, sdata, false); |
| } |
| |
| static struct mesh_path * |
| __mesh_path_lookup_by_idx(struct mesh_table *tbl, int idx) |
| { |
| int i = 0; |
| struct mesh_path *mpath; |
| |
| hlist_for_each_entry_rcu(mpath, &tbl->walk_head, walk_list) { |
| if (i++ == idx) |
| break; |
| } |
| |
| if (!mpath) |
| return NULL; |
| |
| if (mpath_expired(mpath)) { |
| spin_lock_bh(&mpath->state_lock); |
| mpath->flags &= ~MESH_PATH_ACTIVE; |
| spin_unlock_bh(&mpath->state_lock); |
| } |
| return mpath; |
| } |
| |
| /** |
| * mesh_path_lookup_by_idx - look up a path in the mesh path table by its index |
| * @idx: index |
| * @sdata: local subif, or NULL for all entries |
| * |
| * Returns: pointer to the mesh path structure, or NULL if not found. |
| * |
| * Locking: must be called within a read rcu section. |
| */ |
| struct mesh_path * |
| mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx) |
| { |
| return __mesh_path_lookup_by_idx(sdata->u.mesh.mesh_paths, idx); |
| } |
| |
| /** |
| * mpp_path_lookup_by_idx - look up a path in the proxy path table by its index |
| * @idx: index |
| * @sdata: local subif, or NULL for all entries |
| * |
| * Returns: pointer to the proxy path structure, or NULL if not found. |
| * |
| * Locking: must be called within a read rcu section. |
| */ |
| struct mesh_path * |
| mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx) |
| { |
| return __mesh_path_lookup_by_idx(sdata->u.mesh.mpp_paths, idx); |
| } |
| |
| /** |
| * mesh_path_add_gate - add the given mpath to a mesh gate to our path table |
| * @mpath: gate path to add to table |
| */ |
| int mesh_path_add_gate(struct mesh_path *mpath) |
| { |
| struct mesh_table *tbl; |
| int err; |
| |
| rcu_read_lock(); |
| tbl = mpath->sdata->u.mesh.mesh_paths; |
| |
| spin_lock_bh(&mpath->state_lock); |
| if (mpath->is_gate) { |
| err = -EEXIST; |
| spin_unlock_bh(&mpath->state_lock); |
| goto err_rcu; |
| } |
| mpath->is_gate = true; |
| mpath->sdata->u.mesh.num_gates++; |
| |
| spin_lock(&tbl->gates_lock); |
| hlist_add_head_rcu(&mpath->gate_list, &tbl->known_gates); |
| spin_unlock(&tbl->gates_lock); |
| |
| spin_unlock_bh(&mpath->state_lock); |
| |
| mesh_nss_offld_path_update(mpath, true); |
| |
| mpath_dbg(mpath->sdata, |
| "Mesh path: Recorded new gate: %pM. %d known gates\n", |
| mpath->dst, mpath->sdata->u.mesh.num_gates); |
| err = 0; |
| err_rcu: |
| rcu_read_unlock(); |
| return err; |
| } |
| |
| /** |
| * mesh_gate_del - remove a mesh gate from the list of known gates |
| * @tbl: table which holds our list of known gates |
| * @mpath: gate mpath |
| */ |
| static void mesh_gate_del(struct mesh_table *tbl, struct mesh_path *mpath) |
| { |
| lockdep_assert_held(&mpath->state_lock); |
| if (!mpath->is_gate) |
| return; |
| |
| mpath->is_gate = false; |
| spin_lock_bh(&tbl->gates_lock); |
| hlist_del_rcu(&mpath->gate_list); |
| mpath->sdata->u.mesh.num_gates--; |
| spin_unlock_bh(&tbl->gates_lock); |
| |
| mesh_nss_offld_path_update(mpath, true); |
| |
| mpath_dbg(mpath->sdata, |
| "Mesh path: Deleted gate: %pM. %d known gates\n", |
| mpath->dst, mpath->sdata->u.mesh.num_gates); |
| } |
| |
| /** |
| * mesh_gate_num - number of gates known to this interface |
| * @sdata: subif data |
| */ |
| int mesh_gate_num(struct ieee80211_sub_if_data *sdata) |
| { |
| return sdata->u.mesh.num_gates; |
| } |
| |
| void mesh_path_table_debug_dump(struct ieee80211_sub_if_data *sdata) |
| { |
| int idx = 0; |
| u8 dst[ETH_ALEN]; |
| u8 mpp[ETH_ALEN]; |
| u32 sn; |
| u32 metric; |
| u8 hop_count; |
| unsigned long exp_time; |
| enum mesh_path_flags flags; |
| int is_root; |
| int is_gate; |
| struct mesh_path *mpath; |
| struct sta_info *next_hop_sta; |
| |
| mpath_dbg(sdata, "MESH DUMP PATH TABLE mesh_paths_generation %d \n" |
| , sdata->u.mesh.mesh_paths_generation); |
| |
| while (1) { |
| rcu_read_lock(); |
| mpath = mesh_path_lookup_by_idx(sdata, idx); |
| if (!mpath) { |
| rcu_read_unlock(); |
| break; |
| } |
| memcpy(dst, mpath->dst, ETH_ALEN); |
| next_hop_sta = rcu_dereference(mpath->next_hop); |
| if (next_hop_sta) |
| memcpy(mpp, next_hop_sta->sta.addr, ETH_ALEN); |
| else |
| eth_zero_addr(mpp); |
| sn = mpath->sn; |
| metric = mpath->metric; |
| hop_count = mpath->hop_count; |
| if (time_before(jiffies, mpath->exp_time + MESH_PATH_EXPIRE)) { |
| exp_time = jiffies_to_msecs((mpath->exp_time + MESH_PATH_EXPIRE) - jiffies); |
| } else { |
| exp_time = 0; |
| } |
| flags = mpath->flags; |
| is_root = mpath->is_root; |
| is_gate = mpath->is_gate; |
| rcu_read_unlock(); |
| if (idx == 0) { |
| mpath_dbg(sdata, "%17s %17s SNO METRIC HOP EXP(M:S) FLAGS ROOT GATE \n", |
| "DESTINATION ", "NEXT_HOP "); |
| } |
| mpath_dbg(sdata, "%pM %pM %3d %6d %3d %5ld:%2ld 0x%8x %4d %4d\n", |
| dst, mpp, sn, metric, hop_count, exp_time/60000, exp_time%60000, flags, is_root, is_gate); |
| ++idx; |
| } |
| if (idx == 0) { |
| mpath_dbg(sdata, "MESH PATH TABLE is empty \n"); |
| } |
| } |
| |
| void mpp_path_table_debug_dump(struct ieee80211_sub_if_data *sdata) |
| { |
| int idx = 0; |
| struct mesh_path *mpath; |
| u8 dst[ETH_ALEN]; |
| u8 mpp[ETH_ALEN]; |
| |
| mpath_dbg(sdata, "DUMP MPP TABLE mpp_paths_generation %d \n", sdata->u.mesh.mpp_paths_generation); |
| |
| while (1) { |
| rcu_read_lock(); |
| mpath = mpp_path_lookup_by_idx(sdata, idx); |
| if (!mpath) { |
| rcu_read_unlock(); |
| break; |
| } |
| memcpy(dst, mpath->dst, ETH_ALEN); |
| memcpy(mpp, mpath->mpp, ETH_ALEN); |
| rcu_read_unlock(); |
| mpath_dbg(sdata, "dst %pM mpp %pM \n", dst, mpp); |
| ++idx; |
| } |
| } |
| |
| static |
| struct mesh_path *mesh_path_new(struct ieee80211_sub_if_data *sdata, |
| const u8 *dst, gfp_t gfp_flags) |
| { |
| struct mesh_path *new_mpath; |
| |
| new_mpath = kzalloc(sizeof(struct mesh_path), gfp_flags); |
| if (!new_mpath) |
| return NULL; |
| |
| memcpy(new_mpath->dst, dst, ETH_ALEN); |
| eth_broadcast_addr(new_mpath->rann_snd_addr); |
| new_mpath->is_root = false; |
| new_mpath->sdata = sdata; |
| new_mpath->flags = 0; |
| skb_queue_head_init(&new_mpath->frame_queue); |
| new_mpath->exp_time = jiffies; |
| spin_lock_init(&new_mpath->state_lock); |
| timer_setup(&new_mpath->timer, mesh_path_timer, 0); |
| |
| return new_mpath; |
| } |
| |
| /** |
| * Replaces the Ethernet header with fully formed mac+mesh header |
| * which was stored for this DA:SA combination. Also necessary |
| * checks are done for checking freshness of the header |
| */ |
| struct mhdr_cache_entry *mesh_fill_cached_hdr(struct ieee80211_sub_if_data *sdata, |
| struct sk_buff *skb) |
| { |
| struct mesh_hdr_cache *cache; |
| struct mhdr_cache_entry *entry; |
| struct mesh_path *mpath, *mppath; |
| struct ieee80211s_hdr *meshhdr; |
| struct ieee80211_hdr *hdr; |
| struct sta_info *new_nhop; |
| struct ieee80211_key *key; |
| struct ethhdr *eth; |
| u8 sa[ETH_ALEN]; |
| |
| u8 tid; |
| |
| cache = sdata->u.mesh.hdr_cache; |
| |
| if (!cache) |
| return NULL; |
| |
| entry = rhashtable_lookup(&cache->rhead, skb->data, |
| mesh_hdr_rht_params); |
| if (!entry) |
| return NULL; |
| |
| /* Avoid extra work in this path */ |
| if (skb_headroom(skb) < (entry->hdrlen - ETH_HLEN + 2)) |
| return NULL; |
| |
| |
| mpath = rcu_dereference(entry->mpath); |
| if (!mpath) |
| return NULL; |
| |
| /* This check is with assumption that only 6addr frames are |
| * supported currently for caching |
| */ |
| mppath = rcu_dereference(entry->mppath); |
| if (!mppath) |
| return NULL; |
| |
| if (!(mpath->flags & MESH_PATH_ACTIVE)) |
| return NULL; |
| |
| if (mpath_expired(mpath)) |
| return NULL; |
| |
| /* |
| * If the skb is shared we need to obtain our own copy. |
| */ |
| if (skb_shared(skb)) { |
| struct sk_buff *tmp_skb = skb; |
| |
| skb = skb_clone(skb, GFP_ATOMIC); |
| kfree_skb(tmp_skb); |
| |
| if (!skb) |
| return NULL; |
| } |
| |
| /* In case there was a path refresh and update after we last used |
| * update the next hop addr. |
| */ |
| spin_lock_bh(&mpath->state_lock); |
| if (entry->path_change_count != mpath->path_change_count) { |
| new_nhop = rcu_dereference(mpath->next_hop); |
| if (!new_nhop) { |
| spin_unlock_bh(&mpath->state_lock); |
| return NULL; |
| } |
| memcpy(&entry->hdr[4], new_nhop->sta.addr, ETH_ALEN); |
| |
| /* update key. pn_offs will be same */ |
| if (entry->key) { |
| key = rcu_access_pointer(new_nhop->ptk[new_nhop->ptk_idx]); |
| if (!key) |
| key = rcu_access_pointer(sdata->default_unicast_key); |
| rcu_assign_pointer(entry->key, key); |
| } |
| entry->path_change_count = mpath->path_change_count; |
| } |
| spin_unlock_bh(&mpath->state_lock); |
| |
| /* backup eth SA to copy as eaddr2/SA in the mesh header */ |
| eth = (struct ethhdr *)skb->data; |
| ether_addr_copy(sa, eth->h_source); |
| |
| /* Pull DA:SA */ |
| skb_pull(skb, ETH_HLEN - 2); |
| |
| memcpy(skb_push(skb, entry->hdrlen), entry->hdr, entry->hdrlen); |
| |
| meshhdr = (struct ieee80211s_hdr *)(skb->data + entry->machdr_len); |
| hdr = (struct ieee80211_hdr *)skb->data; |
| |
| /* Update mutables */ |
| tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; |
| *ieee80211_get_qos_ctl(hdr) = tid; |
| |
| put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum); |
| sdata->u.mesh.mesh_seqnum++; |
| |
| memcpy(meshhdr->eaddr2, sa, ETH_ALEN); |
| meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; |
| |
| if (mpath->flags & (MESH_PATH_REQ_QUEUED | MESH_PATH_FIXED)) |
| goto out; |
| |
| /* Refresh the path, in case there is a change in nexthop after refresh |
| * hdr will be updated on next lookup |
| */ |
| if (time_after(jiffies, |
| mpath->exp_time - |
| msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) && |
| !(mpath->flags & MESH_PATH_RESOLVING) && |
| !(mpath->flags & MESH_PATH_FIXED)) { |
| mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); |
| } |
| |
| out: |
| mppath->exp_time = jiffies; |
| entry->timestamp = jiffies; |
| |
| return entry; |
| } |
| |
| /** |
| * We store the created header here and save necessary states |
| * and data so as to use them directly when same DA:SA is used |
| * Before using this header we also check in mesh_fill_cached_hdr |
| * whether the path hasnt changed, etc before using |
| */ |
| void mesh_cache_hdr(struct ieee80211_sub_if_data *sdata, |
| struct sk_buff *skb, struct mesh_path *mpath) |
| { |
| struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
| struct mesh_hdr_cache *cache; |
| struct mhdr_cache_entry *mhdr, *old_mhdr; |
| struct ieee80211s_hdr *meshhdr; |
| struct sta_info *next_hop; |
| struct ieee80211_key *key; |
| u8 band, pn_offs = 0, crypto_len = 0; |
| struct mesh_path *mppath; |
| u16 mshhdr_len; |
| int hdrlen; |
| |
| cache = sdata->u.mesh.hdr_cache; |
| |
| if (!cache) |
| return; |
| |
| if (!(info->control.flags & IEEE80211_TX_CTRL_CHECK_FAST_MESH)) |
| return; |
| |
| band = info->band; |
| |
| if (atomic_read(&cache->size) > MESH_HDR_CACHE_SIZE) |
| return; |
| |
| |
| hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| |
| meshhdr = (struct ieee80211s_hdr *)(skb->data + hdrlen); |
| |
| /* TODO Currently supporting only 6addr hdr |
| */ |
| if (!(meshhdr->flags & MESH_FLAGS_AE_A5_A6)) |
| return; |
| |
| next_hop = rcu_dereference(mpath->next_hop); |
| if (!next_hop) |
| return; |
| |
| /* This is required to keep the mppath alive */ |
| mppath = mpp_path_lookup(sdata, meshhdr->eaddr1); |
| |
| if (!mppath) |
| return; |
| |
| /*TODO avoid if peers if they are PS peer and use regulat path */ |
| |
| pn_offs = 0; |
| key = rcu_access_pointer(next_hop->ptk[next_hop->ptk_idx]); |
| if (!key) |
| key = rcu_access_pointer(sdata->default_unicast_key); |
| |
| if (key) { |
| bool gen_iv, iv_spc; |
| |
| gen_iv = key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; |
| iv_spc = key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; |
| |
| if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) |
| return;; |
| |
| if (key->flags & KEY_FLAG_TAINTED) |
| return; |
| |
| switch (key->conf.cipher) { |
| case WLAN_CIPHER_SUITE_CCMP: |
| case WLAN_CIPHER_SUITE_CCMP_256: |
| if (gen_iv) |
| pn_offs = hdrlen; |
| if (gen_iv || iv_spc) |
| crypto_len = IEEE80211_CCMP_HDR_LEN; |
| break; |
| default: |
| /* Limiting supported ciphers for testing */ |
| return; |
| } |
| hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); |
| } |
| |
| mhdr = kzalloc(sizeof(struct mhdr_cache_entry), GFP_KERNEL); |
| if (!mhdr) |
| return; |
| |
| memcpy(mhdr->addr_key, meshhdr->eaddr1, ETH_ALEN); |
| |
| mhdr->machdr_len = hdrlen + crypto_len; |
| mshhdr_len = ieee80211_get_mesh_hdrlen(meshhdr); |
| mhdr->hdrlen = mhdr->machdr_len + mshhdr_len + sizeof(rfc1042_header); |
| rcu_assign_pointer(mhdr->mpath, mpath); |
| rcu_assign_pointer(mhdr->mppath, mppath); |
| rcu_assign_pointer(mhdr->key, key); |
| mhdr->timestamp = jiffies; |
| mhdr->band = band; |
| mhdr->pn_offs = pn_offs; |
| |
| if (pn_offs) { |
| /* ignore the invalid data getting copied to pn location since it will |
| * be overwritten dring tx |
| */ |
| memcpy(mhdr->hdr, skb->data, mhdr->machdr_len); |
| |
| /* copy remaining hdr */ |
| memcpy(mhdr->hdr + mhdr->machdr_len, |
| skb->data + mhdr->machdr_len - crypto_len, |
| mhdr->hdrlen - mhdr->machdr_len); |
| } else { |
| memcpy(mhdr->hdr, skb->data, mhdr->hdrlen); |
| } |
| |
| if (key) { |
| hdr = (struct ieee80211_hdr *)mhdr->hdr; |
| hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); |
| } |
| |
| spin_lock_bh(&cache->walk_lock); |
| old_mhdr = rhashtable_lookup_get_insert_fast(&cache->rhead, |
| &mhdr->rhash, |
| mesh_hdr_rht_params); |
| if (old_mhdr) { |
| spin_unlock_bh(&cache->walk_lock); |
| kfree(mhdr); |
| return; |
| } |
| |
| hlist_add_head(&mhdr->walk_list, &cache->walk_head); |
| spin_unlock_bh(&cache->walk_lock); |
| |
| atomic_inc(&cache->size); |
| } |
| |
| void mesh_hdr_cache_manage(struct ieee80211_sub_if_data *sdata) |
| { |
| struct mesh_hdr_cache *cache; |
| struct mhdr_cache_entry *entry; |
| struct hlist_node *n; |
| |
| cache = sdata->u.mesh.hdr_cache; |
| |
| if (!cache) |
| return; |
| |
| if (atomic_read(&cache->size) < MESH_HDR_CACHE_HIGH_THRESHOLD) |
| return; |
| |
| spin_lock_bh(&cache->walk_lock); |
| hlist_for_each_entry_safe(entry, n, &cache->walk_head, walk_list) { |
| if (time_before(jiffies, |
| entry->timestamp + |
| msecs_to_jiffies(MESH_HDR_CACHE_TIMEOUT))) |
| continue; |
| |
| hlist_del_rcu(&entry->walk_list); |
| rhashtable_remove_fast(&cache->rhead, &entry->rhash, mesh_hdr_rht_params); |
| kfree_rcu(entry, rcu); |
| atomic_dec(&cache->size); |
| } |
| spin_unlock_bh(&cache->walk_lock); |
| } |
| |
| void mesh_hdr_cache_flush(struct mesh_path *mpath, bool is_mpp) |
| { |
| struct ieee80211_sub_if_data *sdata = mpath->sdata; |
| struct mesh_hdr_cache *cache; |
| struct mhdr_cache_entry *entry; |
| struct hlist_node *n; |
| struct mesh_path *entry_mpath; |
| |
| cache = sdata->u.mesh.hdr_cache; |
| |
| if (!cache) |
| return; |
| |
| spin_lock_bh(&cache->walk_lock); |
| /* Only one header per mpp address is expected in the header cache */ |
| if (is_mpp) { |
| entry = rhashtable_lookup(&cache->rhead, mpath->dst, mesh_hdr_rht_params); |
| if (entry) { |
| hlist_del_rcu(&entry->walk_list); |
| rhashtable_remove_fast(&cache->rhead, &entry->rhash, mesh_hdr_rht_params); |
| kfree_rcu(entry, rcu); |
| atomic_dec(&cache->size); |
| } |
| spin_unlock_bh(&cache->walk_lock); |
| return; |
| } |
| |
| hlist_for_each_entry_safe(entry, n, &cache->walk_head, walk_list) { |
| entry_mpath = rcu_dereference(entry->mpath); |
| |
| if (!entry_mpath) |
| continue; |
| |
| if (ether_addr_equal(entry_mpath->dst, mpath->dst)) { |
| hlist_del_rcu(&entry->walk_list); |
| rhashtable_remove_fast(&cache->rhead, &entry->rhash, mesh_hdr_rht_params); |
| kfree_rcu(entry, rcu); |
| atomic_dec(&cache->size); |
| } |
| } |
| spin_unlock_bh(&cache->walk_lock); |
| } |
| |
| struct mesh_path *__mesh_path_add(struct ieee80211_sub_if_data *sdata, |
| const u8 *dst) |
| { |
| struct mesh_table *tbl; |
| struct mesh_path *mpath, *new_mpath; |
| |
| if (ether_addr_equal(dst, sdata->vif.addr)) |
| /* never add ourselves as neighbours */ |
| return ERR_PTR(-ENOTSUPP); |
| |
| if (is_multicast_ether_addr(dst)) |
| return ERR_PTR(-ENOTSUPP); |
| |
| if (atomic_add_unless(&sdata->u.mesh.mpaths, 1, MESH_MAX_MPATHS) == 0) |
| return ERR_PTR(-ENOSPC); |
| |
| new_mpath = mesh_path_new(sdata, dst, GFP_ATOMIC); |
| if (!new_mpath) |
| return ERR_PTR(-ENOMEM); |
| |
| tbl = sdata->u.mesh.mesh_paths; |
| spin_lock_bh(&tbl->walk_lock); |
| mpath = rhashtable_lookup_get_insert_fast(&tbl->rhead, |
| &new_mpath->rhash, |
| mesh_rht_params); |
| if (!mpath) |
| hlist_add_head(&new_mpath->walk_list, &tbl->walk_head); |
| |
| spin_unlock_bh(&tbl->walk_lock); |
| |
| if (mpath) { |
| kfree(new_mpath); |
| |
| if (IS_ERR(mpath)) |
| return mpath; |
| |
| new_mpath = mpath; |
| } |
| |
| sdata->u.mesh.mesh_paths_generation++; |
| return new_mpath; |
| } |
| |
| /** |
| * mesh_path_add - allocate and add a new path to the mesh path table |
| * @dst: destination address of the path (ETH_ALEN length) |
| * @sdata: local subif |
| * |
| * Returns: 0 on success |
| * |
| * State: the initial state of the new path is set to 0 |
| */ |
| struct mesh_path *mesh_path_add(struct ieee80211_sub_if_data *sdata, |
| const u8 *dst) |
| { |
| struct mesh_path *new_path; |
| struct ieee80211_mesh_path_offld path = {0}; |
| |
| new_path = __mesh_path_add(sdata, dst); |
| if (IS_ERR(new_path)) |
| return new_path; |
| |
| ether_addr_copy(path.mesh_da, dst); |
| |
| drv_config_mesh_offload_path(sdata->local, sdata, |
| IEEE80211_MESH_PATH_OFFLD_CMD_ADD_MPATH, |
| &path); |
| |
| return new_path; |
| } |
| |
| int __mpp_path_add(struct ieee80211_sub_if_data *sdata, |
| const u8 *dst, const u8 *mpp) |
| { |
| struct mesh_table *tbl; |
| struct mesh_path *new_mpath; |
| int ret; |
| |
| if (ether_addr_equal(dst, sdata->vif.addr)) |
| /* never add ourselves as neighbours */ |
| return -ENOTSUPP; |
| |
| if (is_multicast_ether_addr(dst)) |
| return -ENOTSUPP; |
| |
| new_mpath = mesh_path_new(sdata, dst, GFP_ATOMIC); |
| |
| if (!new_mpath) |
| return -ENOMEM; |
| |
| memcpy(new_mpath->mpp, mpp, ETH_ALEN); |
| tbl = sdata->u.mesh.mpp_paths; |
| |
| spin_lock_bh(&tbl->walk_lock); |
| ret = rhashtable_lookup_insert_fast(&tbl->rhead, |
| &new_mpath->rhash, |
| mesh_rht_params); |
| if (!ret) |
| hlist_add_head_rcu(&new_mpath->walk_list, &tbl->walk_head); |
| spin_unlock_bh(&tbl->walk_lock); |
| |
| if (ret) |
| kfree(new_mpath); |
| |
| sdata->u.mesh.mpp_paths_generation++; |
| return ret; |
| } |
| |
| int mpp_path_add(struct ieee80211_sub_if_data *sdata, |
| const u8 *dst, const u8 *mpp) |
| { |
| struct ieee80211_mesh_path_offld path = {0}; |
| int ret; |
| |
| ret = __mpp_path_add(sdata, dst, mpp); |
| if (ret) |
| return ret; |
| |
| ether_addr_copy(path.mesh_da, mpp); |
| ether_addr_copy(path.da, dst); |
| |
| drv_config_mesh_offload_path(sdata->local, sdata, |
| IEEE80211_MESH_PATH_OFFLD_CMD_ADD_MPP, |
| &path); |
| |
| return 0; |
| } |
| |
| /** |
| * mesh_plink_broken - deactivates paths and sends perr when a link breaks |
| * |
| * @sta: broken peer link |
| * |
| * This function must be called from the rate control algorithm if enough |
| * delivery errors suggest that a peer link is no longer usable. |
| */ |
| void mesh_plink_broken(struct sta_info *sta) |
| { |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| struct mesh_table *tbl = sdata->u.mesh.mesh_paths; |
| static const u8 bcast[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
| struct mesh_path *mpath; |
| int paths_deactivated = 0, signal_avg; |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(mpath, &tbl->walk_head, walk_list) { |
| if (rcu_access_pointer(mpath->next_hop) == sta && |
| mpath->flags & MESH_PATH_ACTIVE && |
| !(mpath->flags & MESH_PATH_FIXED)) { |
| spin_lock_bh(&mpath->state_lock); |
| mpath->flags &= ~MESH_PATH_ACTIVE; |
| ++mpath->sn; |
| spin_unlock_bh(&mpath->state_lock); |
| mesh_path_error_tx(sdata, |
| sdata->u.mesh.mshcfg.element_ttl, |
| mpath->dst, mpath->sn, |
| WLAN_REASON_MESH_PATH_DEST_UNREACHABLE, bcast); |
| ++paths_deactivated; |
| } |
| } |
| rcu_read_unlock(); |
| if (paths_deactivated) { |
| signal_avg = -ewma_signal_read(&sta->rx_stats_avg.signal); |
| if (sta->mesh->tx_fail_log & MESH_ENABLE_MPL_LOG) |
| sdata_info(sta->sdata, " MESH MPL link to %pM is broken and" |
| " %d path deactivated signal %d dbm signal_avg %d dbm", |
| " medium_busy : %d\n", |
| sta->addr, paths_deactivated, |
| sta->rx_stats.last_signal, |
| signal_avg, sta->local->hw.medium_busy); |
| mesh_continuous_tx_fail_cnt(sta, NL80211_MPATH_BROKEN_NOTIFY); |
| } |
| |
| if (paths_deactivated > 0) |
| sdata_info(sta->sdata, " MESH MPL the link to %pM is broken and %d path deactivated \n", |
| sta->addr, paths_deactivated); |
| } |
| |
| static void mesh_path_free_rcu(struct mesh_table *tbl, |
| struct mesh_path *mpath) |
| { |
| struct ieee80211_sub_if_data *sdata = mpath->sdata; |
| |
| spin_lock_bh(&mpath->state_lock); |
| mpath->flags |= MESH_PATH_RESOLVING | MESH_PATH_DELETED; |
| mesh_gate_del(tbl, mpath); |
| spin_unlock_bh(&mpath->state_lock); |
| del_timer_sync(&mpath->timer); |
| atomic_dec(&sdata->u.mesh.mpaths); |
| atomic_dec(&tbl->entries); |
| mesh_path_flush_pending(mpath); |
| kfree_rcu(mpath, rcu); |
| } |
| |
| static void __mesh_path_del(struct mesh_table *tbl, struct mesh_path *mpath, |
| bool is_mpath_tbl) |
| { |
| struct ieee80211_mesh_path_offld path = {0}; |
| struct sta_info *next_hop; |
| struct ieee80211_sub_if_data *sdata = mpath->sdata; |
| |
| |
| path.metric = mpath->metric; |
| path.exp_time = mpath->exp_time; |
| path.hop_count = mpath->hop_count; |
| path.flags = mpath->flags; |
| if (is_mpath_tbl) { |
| ether_addr_copy(path.mesh_da, mpath->dst); |
| } else { |
| ether_addr_copy(path.mesh_da, mpath->mpp); |
| ether_addr_copy(path.da, mpath->dst); |
| } |
| |
| next_hop = rcu_dereference(mpath->next_hop); |
| if (next_hop) |
| ether_addr_copy(path.next_hop, next_hop->addr); |
| |
| mesh_hdr_cache_flush(mpath, !is_mpath_tbl); |
| |
| hlist_del_rcu(&mpath->walk_list); |
| rhashtable_remove_fast(&tbl->rhead, &mpath->rhash, mesh_rht_params); |
| |
| mesh_path_free_rcu(tbl, mpath); |
| |
| drv_config_mesh_offload_path(sdata->local, sdata, |
| is_mpath_tbl ? IEEE80211_MESH_PATH_OFFLD_CMD_DELETE_MPATH : |
| IEEE80211_MESH_PATH_OFFLD_CMD_DELETE_MPP, |
| &path); |
| } |
| |
| /** |
| * mesh_path_flush_by_nexthop - Deletes mesh paths if their next hop matches |
| * |
| * @sta: mesh peer to match |
| * |
| * RCU notes: this function is called when a mesh plink transitions from |
| * PLINK_ESTAB to any other state, since PLINK_ESTAB state is the only one that |
| * allows path creation. This will happen before the sta can be freed (because |
| * sta_info_destroy() calls this) so any reader in a rcu read block will be |
| * protected against the plink disappearing. |
| */ |
| void mesh_path_flush_by_nexthop(struct sta_info *sta) |
| { |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| struct mesh_table *tbl = sdata->u.mesh.mesh_paths; |
| struct mesh_path *mpath; |
| struct hlist_node *n; |
| int nexthop_deleted = 0; |
| |
| spin_lock_bh(&tbl->walk_lock); |
| hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) { |
| if (rcu_access_pointer(mpath->next_hop) == sta) { |
| __mesh_path_del(tbl, mpath, true); |
| ++nexthop_deleted; |
| } |
| } |
| spin_unlock_bh(&tbl->walk_lock); |
| |
| if (nexthop_deleted) { |
| mpath_dbg(sta->sdata, " MESH MPU %d entries deleted becuase the link to %pM is lost \n", |
| nexthop_deleted, sta->addr); |
| mesh_path_table_debug_dump(sta->sdata); |
| } |
| } |
| |
| static void mpp_flush_by_proxy(struct ieee80211_sub_if_data *sdata, |
| const u8 *proxy) |
| { |
| struct mesh_table *tbl = sdata->u.mesh.mpp_paths; |
| struct mesh_path *mpath; |
| struct hlist_node *n; |
| |
| spin_lock_bh(&tbl->walk_lock); |
| hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) { |
| if (ether_addr_equal(mpath->mpp, proxy)) |
| __mesh_path_del(tbl, mpath, false); |
| } |
| spin_unlock_bh(&tbl->walk_lock); |
| } |
| |
| static void table_flush_by_iface(struct mesh_table *tbl, bool is_mpath_tbl) |
| { |
| struct mesh_path *mpath; |
| struct hlist_node *n; |
| |
| spin_lock_bh(&tbl->walk_lock); |
| hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) { |
| __mesh_path_del(tbl, mpath, is_mpath_tbl); |
| } |
| spin_unlock_bh(&tbl->walk_lock); |
| } |
| |
| /** |
| * mesh_path_flush_by_iface - Deletes all mesh paths associated with a given iface |
| * |
| * This function deletes both mesh paths as well as mesh portal paths. |
| * |
| * @sdata: interface data to match |
| * |
| */ |
| void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata) |
| { |
| table_flush_by_iface(sdata->u.mesh.mesh_paths, true); |
| table_flush_by_iface(sdata->u.mesh.mpp_paths, false); |
| } |
| |
| /** |
| * table_path_del - delete a path from the mesh or mpp table |
| * |
| * @tbl: mesh or mpp path table |
| * @sdata: local subif |
| * @addr: dst address (ETH_ALEN length) |
| * |
| * Returns: 0 if successful |
| */ |
| static int table_path_del(struct mesh_table *tbl, |
| struct ieee80211_sub_if_data *sdata, |
| const u8 *addr, bool is_mpath_tbl) |
| { |
| struct mesh_path *mpath; |
| |
| spin_lock_bh(&tbl->walk_lock); |
| mpath = rhashtable_lookup_fast(&tbl->rhead, addr, mesh_rht_params); |
| if (!mpath) { |
| spin_unlock_bh(&tbl->walk_lock); |
| return -ENXIO; |
| } |
| |
| __mesh_path_del(tbl, mpath, is_mpath_tbl); |
| spin_unlock_bh(&tbl->walk_lock); |
| return 0; |
| } |
| |
| |
| /** |
| * mesh_path_del - delete a mesh path from the table |
| * |
| * @addr: dst address (ETH_ALEN length) |
| * @sdata: local subif |
| * |
| * Returns: 0 if successful |
| */ |
| int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr) |
| { |
| int err; |
| |
| /* flush relevant mpp entries first */ |
| mpp_flush_by_proxy(sdata, addr); |
| |
| err = table_path_del(sdata->u.mesh.mesh_paths, sdata, addr, true); |
| sdata->u.mesh.mesh_paths_generation++; |
| return err; |
| } |
| |
| /** |
| * mesh_path_tx_pending - sends pending frames in a mesh path queue |
| * |
| * @mpath: mesh path to activate |
| * |
| * Locking: the state_lock of the mpath structure must NOT be held when calling |
| * this function. |
| */ |
| void mesh_path_tx_pending(struct mesh_path *mpath) |
| { |
| if (mpath->flags & MESH_PATH_ACTIVE) |
| ieee80211_add_pending_skbs(mpath->sdata->local, |
| &mpath->frame_queue); |
| } |
| |
| /** |
| * mesh_path_send_to_gates - sends pending frames to all known mesh gates |
| * |
| * @mpath: mesh path whose queue will be emptied |
| * |
| * If there is only one gate, the frames are transferred from the failed mpath |
| * queue to that gate's queue. If there are more than one gates, the frames |
| * are copied from each gate to the next. After frames are copied, the |
| * mpath queues are emptied onto the transmission queue. |
| */ |
| int mesh_path_send_to_gates(struct mesh_path *mpath) |
| { |
| struct ieee80211_sub_if_data *sdata = mpath->sdata; |
| struct mesh_table *tbl; |
| struct mesh_path *from_mpath = mpath; |
| struct mesh_path *gate; |
| bool copy = false; |
| |
| tbl = sdata->u.mesh.mesh_paths; |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) { |
| if (gate->flags & MESH_PATH_ACTIVE) { |
| mpath_dbg(sdata, "Forwarding to %pM\n", gate->dst); |
| mesh_path_move_to_queue(gate, from_mpath, copy); |
| from_mpath = gate; |
| copy = true; |
| } else { |
| mpath_dbg(sdata, |
| "Not forwarding to %pM (flags %#x)\n", |
| gate->dst, gate->flags); |
| } |
| } |
| |
| hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) { |
| mpath_dbg(sdata, "Sending to %pM\n", gate->dst); |
| mesh_path_tx_pending(gate); |
| } |
| rcu_read_unlock(); |
| |
| return (from_mpath == mpath) ? -EHOSTUNREACH : 0; |
| } |
| |
| /** |
| * mesh_path_discard_frame - discard a frame whose path could not be resolved |
| * |
| * @skb: frame to discard |
| * @sdata: network subif the frame was to be sent through |
| * |
| * Locking: the function must me called within a rcu_read_lock region |
| */ |
| void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata, |
| struct sk_buff *skb) |
| { |
| kfree_skb(skb); |
| sdata->u.mesh.mshstats.dropped_frames_no_route++; |
| } |
| |
| /** |
| * mesh_path_flush_pending - free the pending queue of a mesh path |
| * |
| * @mpath: mesh path whose queue has to be freed |
| * |
| * Locking: the function must me called within a rcu_read_lock region |
| */ |
| void mesh_path_flush_pending(struct mesh_path *mpath) |
| { |
| struct sk_buff *skb; |
| |
| while ((skb = skb_dequeue(&mpath->frame_queue)) != NULL) |
| mesh_path_discard_frame(mpath->sdata, skb); |
| } |
| |
| /** |
| * mesh_path_fix_nexthop - force a specific next hop for a mesh path |
| * |
| * @mpath: the mesh path to modify |
| * @next_hop: the next hop to force |
| * |
| * Locking: this function must be called holding mpath->state_lock |
| */ |
| void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop) |
| { |
| struct sta_info *old_next_hop; |
| |
| spin_lock_bh(&mpath->state_lock); |
| old_next_hop = rcu_dereference(mpath->next_hop); |
| mesh_path_assign_nexthop(mpath, next_hop); |
| mpath->sn = 0xffff; |
| mpath->metric = 0; |
| mpath->hop_count = 0; |
| mpath->exp_time = 0; |
| mpath->flags = MESH_PATH_FIXED | MESH_PATH_SN_VALID; |
| mesh_path_activate(mpath); |
| if (!old_next_hop || !ether_addr_equal(old_next_hop->addr, next_hop->addr)) |
| mpath->path_change_count++; |
| spin_unlock_bh(&mpath->state_lock); |
| ewma_mesh_fail_avg_init(&next_hop->mesh->fail_avg); |
| /* init it at a low value - 0 start is tricky */ |
| ewma_mesh_fail_avg_add(&next_hop->mesh->fail_avg, 1); |
| mesh_path_tx_pending(mpath); |
| |
| mesh_nss_offld_path_update(mpath, true); |
| } |
| |
| int mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata) |
| { |
| struct mesh_table *tbl_path, *tbl_mpp; |
| int ret; |
| |
| atomic_add(sizeof(struct mesh_table), |
| &sdata->local->memory_stats.malloc_size); |
| |
| tbl_path = mesh_table_alloc(); |
| if (!tbl_path) |
| return -ENOMEM; |
| |
| tbl_mpp = mesh_table_alloc(); |
| if (!tbl_mpp) { |
| ret = -ENOMEM; |
| goto free_path; |
| } |
| |
| atomic_add(sizeof(struct mesh_table), |
| &sdata->local->memory_stats.malloc_size); |
| |
| mesh_hdr_cache_init(sdata); |
| |
| sdata->u.mesh.mesh_paths = tbl_path; |
| sdata->u.mesh.mpp_paths = tbl_mpp; |
| |
| return 0; |
| |
| free_path: |
| atomic_sub(sizeof(struct mesh_table), |
| &sdata->local->memory_stats.malloc_size); |
| mesh_table_free(tbl_path); |
| return ret; |
| } |
| |
| static |
| void mesh_path_tbl_expire(struct ieee80211_sub_if_data *sdata, |
| struct mesh_table *tbl, bool is_mpath_tbl) |
| { |
| struct mesh_path *mpath; |
| struct hlist_node *n; |
| int expired_deleted = 0; |
| |
| spin_lock_bh(&tbl->walk_lock); |
| hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) { |
| if ((!(mpath->flags & MESH_PATH_RESOLVING)) && |
| (!(mpath->flags & MESH_PATH_FIXED)) && |
| time_after(jiffies, mpath->exp_time + MESH_PATH_EXPIRE)) { |
| __mesh_path_del(tbl, mpath, is_mpath_tbl); |
| ++expired_deleted; |
| } |
| } |
| spin_unlock_bh(&tbl->walk_lock); |
| |
| if (expired_deleted) { |
| if (sdata->u.mesh.mesh_paths == tbl) { |
| mpath_dbg(sdata, "MESH MPU %d entries expired and deleted \n", |
| expired_deleted); |
| mesh_path_table_debug_dump(sdata); |
| } else { |
| mpath_dbg(sdata, "MESH MPPU %d entries expired and deleted \n", |
| expired_deleted); |
| mpp_path_table_debug_dump(sdata); |
| } |
| } |
| } |
| |
| void mesh_path_expire(struct ieee80211_sub_if_data *sdata) |
| { |
| mesh_path_tbl_expire(sdata, sdata->u.mesh.mesh_paths, true); |
| mesh_path_tbl_expire(sdata, sdata->u.mesh.mpp_paths, false); |
| } |
| |
| void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata) |
| { |
| atomic_sub(sizeof(struct mesh_table), |
| &sdata->local->memory_stats.malloc_size); |
| atomic_sub(sizeof(struct mesh_table), |
| &sdata->local->memory_stats.malloc_size); |
| mesh_table_free(sdata->u.mesh.mesh_paths); |
| mesh_table_free(sdata->u.mesh.mpp_paths); |
| mesh_hdr_cache_deinit(sdata); |
| } |