diff options
Diffstat (limited to 'node/Packet.hpp')
| -rw-r--r-- | node/Packet.hpp | 67 |
1 files changed, 1 insertions, 66 deletions
diff --git a/node/Packet.hpp b/node/Packet.hpp index d7f7fd60..4b82c2cc 100644 --- a/node/Packet.hpp +++ b/node/Packet.hpp @@ -603,72 +603,7 @@ public: */ VERB_EXT_FRAME = 7, - /* A multicast frame [old multicast protocol, deprecated]: - * <[2] 16-bit propagation depth or 0xffff for "do not forward"> - * <[320] propagation FIFO> - * <[1024] propagation bloom filter> - * [... begin signed portion ...] - * <[1] 8-bit flags, currently unused and must be 0> - * <[8] 64-bit network ID> - * <[2] 16-bit random propagation bloom filter nonce> - * <[1] number of significant bits in propagation restrict prefix> - * <[1] propagation restriction prefix (sig bits right to left)> - * <[5] ZeroTier address of node of origin> - * <[3] 24-bit multicast ID, together with origin forms GUID> - * <[6] source MAC address> - * <[6] destination multicast group MAC address> - * <[4] destination multicast group ADI field> - * <[2] 16-bit frame ethertype> - * <[2] 16-bit length of payload> - * <[...] ethernet frame payload> - * [... end of signed portion ...] - * <[2] 16-bit length of signature> - * <[...] signature (currently Ed25519/SHA-512, 96 bytes in length)> - * [<[...] network membership certificate (optional)>] - * - * Flags: - * 0x01 - Multicast frame includes network membership certificate - * for original sender for this network. - * - * When a multicast frame is received: - * - * (1) Check the signature of the signed portion of packet, discard on fail - * (2) Check for duplicate multicast, STOP if duplicate - * (3) Check rate limits, STOP if over limit - * (4) Inject into tap if member of network and packet passes other checks - * (5) Increment propagation depth, STOP if over limit - * (6) Pop topmost element off FIFO -- this is next hop - * (7) Push suggested next hops onto FIFO until full -- set corresponding - * bits in bloom filter - * (8) Send to next hop, or to a supernode if none - * - * When choosing next hops, exclude addresses corresponding to bits already - * set in the bloom filter and addresses outside the propagation restrict - * prefix. - * - * Active bridges on a network are always added as next hops for all - * multicast and broadcast traffic, as if they "like" all groups. - * - * Algorithm for setting bits in bloom filter: - * - * (1) Place the address in the least significant 40 bits of a 64-bit int. - * (2) Add the bloom filter nonce to this value. - * (3) XOR the least significant 13 bits of this value with the next most - * significant 13 bits and so on, 4 times. - * (4) This value ANDed with 0x1fff is the bit to set in the bloom filter. - * (5) Set this bit via: byte[bit >> 3] |= (0x80 >> (bit & 7)) - * - * To check bits in bloom filter perform the same computation but mask the - * bit instead of ORing it. - * - * Propagation occurs within a restrict prefix. The restrict prefix is - * applied to the least significant 16 bits of an address. The original - * sender of the multicast sets the restrict prefix and sends 2^N copies - * of the multicast frame, one for each address prefix. - * - * ERROR may be generated if a membership certificate is needed for a - * closed network. Payload will be network ID. - */ + /* DEPRECATED -- legacy support only, will go away completely soon */ VERB_P5_MULTICAST_FRAME = 8, /* Announce interest in multicast group(s): |