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Merge #19728: Increase the ip address relay branching factor for unreachable networks

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86d4cf42d97abf4c436d1eabf29e2ed150f69c1e Increase the ip address relay branching factor for unreachable networks (Pieter Wuille)

Pull request description:

  Onion addresses propagate very badly among the IPv4/IPv6 network, resulting
  in difficulty for those to find each other.

  The branching factor 1 is probably so low that propagations die out before
  they reach another onion peer. Increase it to 1.5 on average.

ACKs for top commit:
  practicalswift:
    ACK 86d4cf42d97abf4c436d1eabf29e2ed150f69c1e -- patch looks correct
  naumenkogs:
    ACK 86d4cf4
  jonatack:
    ACK 86d4cf42d97abf4c436d1eabf29e2ed150f69c1e. Code review, built and running with some sanity check logging. `RelayAddress()` is called by `ProcessMessage() ADDR` msg handling, from within the loop while processing each new address to relay it to a limited number of other nodes. According to git blame, the line setting `nRelayNodes` hasn't been touched since 2016 in e736772c56 *Move network-msg-processing code out of main to its own file*, which moved the line but otherwise did not change it. Running a mixed clearnet/onion node with this patch and the logging below, I'm only seeing values of `fReachable 1, nRelayNodes 2`. IIUC, I need to use the settings in `init.cpp` that call `SetReachable(*, false)`. *Edit:* with `onlynet=onion` am now seeing entries of `fReachable 0` with `nRelayNodes` values of 1 and 2.
  vasild:
    ACK 86d4cf42d

Tree-SHA512: 22391e16d60bcfdec9a9336728da39d68a24a183b3d1b0e8fbc038d265ca6ddf71d16db018f3678745fd9f3e9281049e42197fa0a29124833c50a9170ed6f793
This commit is contained in:
Wladimir J. van der Laan 2020-09-05 14:07:52 +02:00 committed by pasta
parent 64c0ce9401
commit fdc99dcc64
1 changed files with 3 additions and 1 deletions
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4
src/net_processing.cpp
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@ -1400,7 +1400,6 @@ bool static AlreadyHave(const CInv& inv) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
static void RelayAddress(const CAddress& addr, bool fReachable, CConnman* connman)
{
unsigned int nRelayNodes = fReachable ? 2 : 1; // limited relaying of addresses outside our network(s)
// Relay to a limited number of other nodes
// Use deterministic randomness to send to the same nodes for 24 hours
@ -1409,6 +1408,9 @@ static void RelayAddress(const CAddress& addr, bool fReachable, CConnman* connma
const CSipHasher hasher = connman->GetDeterministicRandomizer(RANDOMIZER_ID_ADDRESS_RELAY).Write(hashAddr << 32).Write((GetTime() + hashAddr) / (24*60*60));
FastRandomContext insecure_rand;
// Relay reachable addresses to 2 peers. Unreachable addresses are relayed randomly to 1 or 2 peers.
unsigned int nRelayNodes = (fReachable || (hasher.Finalize() & 1)) ? 2 : 1;
std::array<std::pair<uint64_t, CNode*>,2> best{{{0, nullptr}, {0, nullptr}}};
assert(nRelayNodes <= best.size());