--- /dev/null
+From: Felix Fietkau <nbd@nbd.name>
+Date: Fri, 30 Jun 2023 13:11:51 +0200
+Subject: [PATCH] mac80211: split mesh fast tx cache into
+ local/proxied/forwarded
+
+Depending on the origin of the packets (and their SA), 802.11 + mesh headers
+could be filled in differently. In order to properly deal with that, add a
+new field to the lookup key, indicating the type (local, proxied or
+forwarded). This can fix spurious packet drop issues that depend on the order
+in which nodes/hosts communicate with each other.
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/net/mac80211/mesh.c
++++ b/net/mac80211/mesh.c
+@@ -703,6 +703,9 @@ bool ieee80211_mesh_xmit_fast(struct iee
+ struct sk_buff *skb, u32 ctrl_flags)
+ {
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
++ struct ieee80211_mesh_fast_tx_key key = {
++ .type = MESH_FAST_TX_TYPE_LOCAL
++ };
+ struct ieee80211_mesh_fast_tx *entry;
+ struct ieee80211s_hdr *meshhdr;
+ u8 sa[ETH_ALEN] __aligned(2);
+@@ -738,7 +741,10 @@ bool ieee80211_mesh_xmit_fast(struct iee
+ return false;
+ }
+
+- entry = mesh_fast_tx_get(sdata, skb->data);
++ ether_addr_copy(key.addr, skb->data);
++ if (!ether_addr_equal(skb->data + ETH_ALEN, sdata->vif.addr))
++ key.type = MESH_FAST_TX_TYPE_PROXIED;
++ entry = mesh_fast_tx_get(sdata, &key);
+ if (!entry)
+ return false;
+
+--- a/net/mac80211/mesh.h
++++ b/net/mac80211/mesh.h
+@@ -133,9 +133,33 @@ struct mesh_path {
+ #define MESH_FAST_TX_CACHE_TIMEOUT 8000 /* msecs */
+
+ /**
++ * enum ieee80211_mesh_fast_tx_type - cached mesh fast tx entry type
++ *
++ * @MESH_FAST_TX_TYPE_LOCAL: tx from the local vif address as SA
++ * @MESH_FAST_TX_TYPE_PROXIED: local tx with a different SA (e.g. bridged)
++ * @MESH_FAST_TX_TYPE_FORWARDED: forwarded from a different mesh point
++ */
++enum ieee80211_mesh_fast_tx_type {
++ MESH_FAST_TX_TYPE_LOCAL,
++ MESH_FAST_TX_TYPE_PROXIED,
++ MESH_FAST_TX_TYPE_FORWARDED,
++};
++
++/**
++ * struct ieee80211_mesh_fast_tx_key - cached mesh fast tx entry key
++ *
++ * @addr: The Ethernet DA for this entry
++ * @type: cache entry type
++ */
++struct ieee80211_mesh_fast_tx_key {
++ u8 addr[ETH_ALEN] __aligned(2);
++ enum ieee80211_mesh_fast_tx_type type;
++};
++
++/**
+ * struct ieee80211_mesh_fast_tx - cached mesh fast tx entry
+ * @rhash: rhashtable pointer
+- * @addr_key: The Ethernet DA which is the key for this entry
++ * @key: the lookup key for this cache entry
+ * @fast_tx: base fast_tx data
+ * @hdr: cached mesh and rfc1042 headers
+ * @hdrlen: length of mesh + rfc1042
+@@ -146,7 +170,7 @@ struct mesh_path {
+ */
+ struct ieee80211_mesh_fast_tx {
+ struct rhash_head rhash;
+- u8 addr_key[ETH_ALEN] __aligned(2);
++ struct ieee80211_mesh_fast_tx_key key;
+
+ struct ieee80211_fast_tx fast_tx;
+ u8 hdr[sizeof(struct ieee80211s_hdr) + sizeof(rfc1042_header)];
+@@ -329,7 +353,8 @@ void mesh_path_tx_root_frame(struct ieee
+
+ bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt);
+ struct ieee80211_mesh_fast_tx *
+-mesh_fast_tx_get(struct ieee80211_sub_if_data *sdata, const u8 *addr);
++mesh_fast_tx_get(struct ieee80211_sub_if_data *sdata,
++ struct ieee80211_mesh_fast_tx_key *key);
+ bool ieee80211_mesh_xmit_fast(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb, u32 ctrl_flags);
+ void mesh_fast_tx_cache(struct ieee80211_sub_if_data *sdata,
+--- a/net/mac80211/mesh_pathtbl.c
++++ b/net/mac80211/mesh_pathtbl.c
+@@ -36,8 +36,8 @@ static const struct rhashtable_params me
+ static const struct rhashtable_params fast_tx_rht_params = {
+ .nelem_hint = 10,
+ .automatic_shrinking = true,
+- .key_len = ETH_ALEN,
+- .key_offset = offsetof(struct ieee80211_mesh_fast_tx, addr_key),
++ .key_len = sizeof(struct ieee80211_mesh_fast_tx_key),
++ .key_offset = offsetof(struct ieee80211_mesh_fast_tx, key),
+ .head_offset = offsetof(struct ieee80211_mesh_fast_tx, rhash),
+ .hashfn = mesh_table_hash,
+ };
+@@ -426,20 +426,21 @@ static void mesh_fast_tx_entry_free(stru
+ }
+
+ struct ieee80211_mesh_fast_tx *
+-mesh_fast_tx_get(struct ieee80211_sub_if_data *sdata, const u8 *addr)
++mesh_fast_tx_get(struct ieee80211_sub_if_data *sdata,
++ struct ieee80211_mesh_fast_tx_key *key)
+ {
+ struct ieee80211_mesh_fast_tx *entry;
+ struct mesh_tx_cache *cache;
+
+ cache = &sdata->u.mesh.tx_cache;
+- entry = rhashtable_lookup(&cache->rht, addr, fast_tx_rht_params);
++ entry = rhashtable_lookup(&cache->rht, key, fast_tx_rht_params);
+ if (!entry)
+ return NULL;
+
+ if (!(entry->mpath->flags & MESH_PATH_ACTIVE) ||
+ mpath_expired(entry->mpath)) {
+ spin_lock_bh(&cache->walk_lock);
+- entry = rhashtable_lookup(&cache->rht, addr, fast_tx_rht_params);
++ entry = rhashtable_lookup(&cache->rht, key, fast_tx_rht_params);
+ if (entry)
+ mesh_fast_tx_entry_free(cache, entry);
+ spin_unlock_bh(&cache->walk_lock);
+@@ -484,18 +485,24 @@ void mesh_fast_tx_cache(struct ieee80211
+ if (!sta)
+ return;
+
++ build.key.type = MESH_FAST_TX_TYPE_LOCAL;
+ if ((meshhdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6) {
+ /* This is required to keep the mppath alive */
+ mppath = mpp_path_lookup(sdata, meshhdr->eaddr1);
+ if (!mppath)
+ return;
+ build.mppath = mppath;
++ if (!ether_addr_equal(meshhdr->eaddr2, sdata->vif.addr))
++ build.key.type = MESH_FAST_TX_TYPE_PROXIED;
+ } else if (ieee80211_has_a4(hdr->frame_control)) {
+ mppath = mpath;
+ } else {
+ return;
+ }
+
++ if (!ether_addr_equal(hdr->addr4, sdata->vif.addr))
++ build.key.type = MESH_FAST_TX_TYPE_FORWARDED;
++
+ /* rate limit, in case fast xmit can't be enabled */
+ if (mppath->fast_tx_check == jiffies)
+ return;
+@@ -542,7 +549,7 @@ void mesh_fast_tx_cache(struct ieee80211
+ }
+ }
+
+- memcpy(build.addr_key, mppath->dst, ETH_ALEN);
++ memcpy(build.key.addr, mppath->dst, ETH_ALEN);
+ build.timestamp = jiffies;
+ build.fast_tx.band = info->band;
+ build.fast_tx.da_offs = offsetof(struct ieee80211_hdr, addr3);
+@@ -644,13 +651,19 @@ void mesh_fast_tx_flush_addr(struct ieee
+ const u8 *addr)
+ {
+ struct mesh_tx_cache *cache = &sdata->u.mesh.tx_cache;
++ struct ieee80211_mesh_fast_tx_key key = {};
+ struct ieee80211_mesh_fast_tx *entry;
++ int i;
+
++ ether_addr_copy(key.addr, addr);
+ cache = &sdata->u.mesh.tx_cache;
+ spin_lock_bh(&cache->walk_lock);
+- entry = rhashtable_lookup(&cache->rht, addr, fast_tx_rht_params);
+- if (entry)
+- mesh_fast_tx_entry_free(cache, entry);
++ for (i = MESH_FAST_TX_TYPE_LOCAL; i < MESH_FAST_TX_TYPE_FORWARDED; i++) {
++ key.type = i;
++ entry = rhashtable_lookup(&cache->rht, &key, fast_tx_rht_params);
++ if (entry)
++ mesh_fast_tx_entry_free(cache, entry);
++ }
+ spin_unlock_bh(&cache->walk_lock);
+ }
+
+--- a/net/mac80211/rx.c
++++ b/net/mac80211/rx.c
+@@ -2726,7 +2726,10 @@ ieee80211_rx_mesh_fast_forward(struct ie
+ struct sk_buff *skb, int hdrlen)
+ {
+ struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+- struct ieee80211_mesh_fast_tx *entry = NULL;
++ struct ieee80211_mesh_fast_tx_key key = {
++ .type = MESH_FAST_TX_TYPE_FORWARDED
++ };
++ struct ieee80211_mesh_fast_tx *entry;
+ struct ieee80211s_hdr *mesh_hdr;
+ struct tid_ampdu_tx *tid_tx;
+ struct sta_info *sta;
+@@ -2735,9 +2738,13 @@ ieee80211_rx_mesh_fast_forward(struct ie
+
+ mesh_hdr = (struct ieee80211s_hdr *)(skb->data + sizeof(eth));
+ if ((mesh_hdr->flags & MESH_FLAGS_AE) == MESH_FLAGS_AE_A5_A6)
+- entry = mesh_fast_tx_get(sdata, mesh_hdr->eaddr1);
++ ether_addr_copy(key.addr, mesh_hdr->eaddr1);
+ else if (!(mesh_hdr->flags & MESH_FLAGS_AE))
+- entry = mesh_fast_tx_get(sdata, skb->data);
++ ether_addr_copy(key.addr, skb->data);
++ else
++ return false;
++
++ entry = mesh_fast_tx_get(sdata, &key);
+ if (!entry)
+ return false;
+
projects / openwrt / staging / hauke.git / commitdiff