And mpp table grows fast, which can affect mpp lookup efficiency severely.
Here is the problem (code line number is based on 3.6.3 kernel)
It happens when user turns on encryption.
1835 #ifdef CONFIG_MAC80211_MESH
1836 static ieee80211_rx_result
1837 ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
1838 {
...
1849
1850 hdr = (struct ieee80211_hdr *) skb->data;
1851 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1852 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
...
1865
1866 if (mesh_hdr->flags & MESH_FLAGS_AE) { //CLIN: mesh_hdr is pointed at ENCRYPTED part
// if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1867 struct mesh_path *mppath;
1868 char *proxied_addr;
1869 char *mpp_addr;
1870
1871 if (is_multicast_ether_addr(hdr->addr1)) {
1872 mpp_addr = hdr->addr3;
1873 proxied_addr = mesh_hdr->eaddr1; //CLIN: deference random data result in random MAC for proxied_addr
1874 } else {
1875 mpp_addr = hdr->addr4;
1876 proxied_addr = mesh_hdr->eaddr2; //CLIN: deference random data result in random MAC for proxied_addr
1877 }
1878
1879 rcu_read_lock();
1880 mppath = mpp_path_lookup(proxied_addr, sdata);
1881 if (!mppath) {
1882 mpp_path_add(proxied_addr, mpp_addr, sdata); //CLIN: mpp table grows fast, almost as fast as packet in air
1883 } else {
1884 spin_lock_bh(&mppath->state_lock);
1885 if (!ether_addr_equal(mppath->mpp, mpp_addr))
1886 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
1887 spin_unlock_bh(&mppath->state_lock);
1888 }
1889 rcu_read_unlock();
1890 }
Below is part of a dump of mpp table. ("proxy" entry is my debugging code, not available in kernel 3.6.3)
/debugfs/ieee80211/phy0/netdev:mesh0 # cat proxy
Dest Addr Proxied By Next Hop
00:07:d5:04:74:c1 00:15:6d:84:ff:32 00:15:6d:84:ff:32
e0:ce:da:58:e3:2f 00:15:6d:84:ff:32 00:15:6d:84:ff:32
16:61:07:b2:cd:e7 00:0e:8e:30:bc:6d 00:0e:8e:30:bc:6d
8a:04:1c:a8:f2:ad 00:15:6d:84:ff:32 00:15:6d:84:ff:32
00:0e:8e:30:bc:6d 00:0e:8e:30:bc:6d 00:0e:8e:30:bc:6d
1a:e3:bf:17:10:fa 00:15:6d:84:ff:32 00:15:6d:84:ff:32
ea:a8:15:0a:00:cf 00:0e:8e:30:bc:6d 00:0e:8e:30:bc:6d
1c:db:fb:06:7a:63 00:0e:8e:30:bc:6d 00:0e:8e:30:bc:6d
48:58:a9:a1:5c:78 00:15:6d:84:ff:32 00:15:6d:84:ff:32
20:c1:ec:93:78:98 00:0e:8e:30:bc:6d 00:0e:8e:30:bc:6d
66:94:85:35:3b:bb 00:0e:8e:30:bc:6d 00:0e:8e:30:bc:6d
34:e8:5f:4a:95:cb 00:15:6d:84:ff:32 00:15:6d:84:ff:32
1e:23:8c:6e:bd:d5 00:15:6d:84:ff:32 00:15:6d:84:ff:32
b6:3d:1e:2a:f3:b4 00:15:6d:84:ff:32 00:15:6d:84:ff:32
16:f9:1a:7b:55:34 00:15:6d:84:ff:32 00:15:6d:84:ff:32
8c:e2:ae:c0:23:16 00:15:6d:84:ff:32 00:15:6d:84:ff:32
3c:9e:5a:71:85:d2 00:15:6d:84:ff:32 00:15:6d:84:ff:32
46:27:ff:24:e9:1d 00:15:6d:84:ff:32 00:15:6d:84:ff:32
d4:63:8c:ab:b1:c6 00:15:6d:84:ff:32 00:15:6d:84:ff:32
52:26:25:fe:d9:7a 00:0e:8e:30:bc:6d 00:0e:8e:30:bc:6d
e4:cf:a6:c7:91:84 00:0e:8e:30:bc:6d 00:0e:8e:30:bc:6d
46:17:c9:19:60:9a 00:15:6d:84:ff:32 00:15:6d:84:ff:32
ee:9d:46:df:6e:f8 00:15:6d:84:ff:32 00:15:6d:84:ff:32
4e:9d:1f:96:74:e5 00:0e:8e:30:bc:6d 00:0e:8e:30:bc:6d
00:1c:23:10:b3:62 00:0e:8e:38:36:03 00:0e:8e:38:36:03
e4:ef:e6:1d:2c:35 00:0e:8e:30:bc:6d 00:0e:8e:30:bc:6d
00:07:d5:04:2d:78 00:0e:8e:38:36:03 00:0e:8e:38:36:03
1a:b4:a6:6f:4b:e0 00:15:6d:84:ff:32 00:15:6d:84:ff:32
30:0c:76:27:16:0f 00:15:6d:84:ff:32 00:15:6d:84:ff:32
c2:e8:02:cb:af:58 00:0e:8e:30:bc:6d 00:0e:8e:30:bc:6d
8e:01:7e:68:5a:ac 00:0e:8e:30:bc:6d 00:0e:8e:30:bc:6d
e8:44:db:dd:fd:75 00:15:6d:84:ff:32 00:15:6d:84:ff:32
32:3b:c2:18:2a:fd 00:0e:8e:30:bc:6d 00:0e:8e:30:bc:6d
ae:23:08:cb:6d:47 00:0e:8e:30:bc:6d 00:0e:8e:30:bc:6d
The cure is to move below early in this function when packet is encrypted.
1904 if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
1905 goto out;
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