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Merge branch 'ticket27490a_squashed'
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2b2b97484a
6
changes/ticket27490
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6
changes/ticket27490
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@ -0,0 +1,6 @@
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o Minor features (ipv6):
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- We add an option ClientAutoIPv6ORPort which makes clients randomly
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prefer a node's IPv4 or IPv6 ORPort. The random preference is set
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every time a node is loaded from a new consensus or bridge config.
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Closes ticket 27490. Patch by Neel Chauhan.
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@ -1749,6 +1749,12 @@ The following options are useful only for clients (that is, if
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other clients prefer IPv4. Other things may influence the choice. This
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option breaks a tie to the favor of IPv6. (Default: auto)
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[[ClientAutoIPv6ORPort]] **ClientAutoIPv6ORPort** **0**|**1**::
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If this option is set to 1, Tor clients randomly prefer a node's IPv4 or
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IPv6 ORPort. The random preference is set every time a node is loaded
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from a new consensus or bridge config. When this option is set to 1,
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**ClientPreferIPv6ORPort** is ignored. (Default: 0)
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[[PathsNeededToBuildCircuits]] **PathsNeededToBuildCircuits** __NUM__::
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Tor clients don't build circuits for user traffic until they know
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about enough of the network so that they could potentially construct
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@ -340,6 +340,7 @@ static config_var_t option_vars_[] = {
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V(ClientOnly, BOOL, "0"),
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V(ClientPreferIPv6ORPort, AUTOBOOL, "auto"),
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V(ClientPreferIPv6DirPort, AUTOBOOL, "auto"),
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V(ClientAutoIPv6ORPort, BOOL, "0"),
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V(ClientRejectInternalAddresses, BOOL, "1"),
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V(ClientTransportPlugin, LINELIST, NULL),
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V(ClientUseIPv6, BOOL, "0"),
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@ -666,6 +666,9 @@ struct or_options_t {
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* accessing this value directly. */
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int ClientPreferIPv6DirPort;
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/** If true, prefer an IPv4 or IPv6 OR port at random. */
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int ClientAutoIPv6ORPort;
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/** The length of time that we think a consensus should be fresh. */
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int V3AuthVotingInterval;
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/** The length of time we think it will take to distribute votes. */
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@ -2076,6 +2076,11 @@ connection_connect_log_client_use_ip_version(const connection_t *conn)
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return;
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}
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if (fascist_firewall_use_ipv6(options)) {
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log_info(LD_NET, "Our outgoing connection is using IPv%d.",
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tor_addr_family(&real_addr) == AF_INET6 ? 6 : 4);
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}
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/* Check if we couldn't satisfy an address family preference */
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if ((!pref_ipv6 && tor_addr_family(&real_addr) == AF_INET6)
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|| (pref_ipv6 && tor_addr_family(&real_addr) == AF_INET)) {
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@ -29,6 +29,7 @@
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#include "feature/relay/routermode.h"
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#include "lib/geoip/geoip.h"
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#include "ht.h"
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#include "lib/crypt_ops/crypto_rand.h"
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#include "lib/encoding/confline.h"
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#include "core/or/addr_policy_st.h"
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@ -461,7 +462,8 @@ fascist_firewall_use_ipv6(const or_options_t *options)
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* ClientPreferIPv6DirPort is deprecated, but check it anyway. */
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return (options->ClientUseIPv6 == 1 || options->ClientUseIPv4 == 0 ||
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options->ClientPreferIPv6ORPort == 1 ||
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options->ClientPreferIPv6DirPort == 1 || options->UseBridges == 1);
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options->ClientPreferIPv6DirPort == 1 || options->UseBridges == 1 ||
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options->ClientAutoIPv6ORPort == 1);
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}
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/** Do we prefer to connect to IPv6, ignoring ClientPreferIPv6ORPort and
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@ -488,6 +490,15 @@ fascist_firewall_prefer_ipv6_impl(const or_options_t *options)
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return -1;
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}
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/* Choose whether we prefer IPv4 or IPv6 by randomly choosing an address
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* family. Return 0 for IPv4, and 1 for IPv6. */
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MOCK_IMPL(int,
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fascist_firewall_rand_prefer_ipv6_addr, (void))
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{
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/* TODO: Check for failures, and infer our preference based on this. */
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return crypto_rand_int(2);
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}
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/** Do we prefer to connect to IPv6 ORPorts?
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* Use node_ipv6_or_preferred() whenever possible: it supports bridge client
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* per-node IPv6 preferences.
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@ -502,7 +513,10 @@ fascist_firewall_prefer_ipv6_orport(const or_options_t *options)
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}
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/* We can use both IPv4 and IPv6 - which do we prefer? */
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if (options->ClientPreferIPv6ORPort == 1) {
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if (options->ClientAutoIPv6ORPort == 1) {
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/* If ClientAutoIPv6ORPort is 1, we prefer IPv4 or IPv6 at random. */
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return fascist_firewall_rand_prefer_ipv6_addr();
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} else if (options->ClientPreferIPv6ORPort == 1) {
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return 1;
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}
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@ -70,6 +70,7 @@ typedef struct short_policy_t {
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int firewall_is_fascist_or(void);
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int firewall_is_fascist_dir(void);
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int fascist_firewall_use_ipv6(const or_options_t *options);
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MOCK_DECL(int, fascist_firewall_rand_prefer_ipv6_addr, (void));
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int fascist_firewall_prefer_ipv6_orport(const or_options_t *options);
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int fascist_firewall_prefer_ipv6_dirport(const or_options_t *options);
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@ -844,7 +844,8 @@ rewrite_node_address_for_bridge(const bridge_info_t *bridge, node_t *node)
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}
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}
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if (options->ClientPreferIPv6ORPort == -1) {
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if (options->ClientPreferIPv6ORPort == -1 ||
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options->ClientAutoIPv6ORPort == 0) {
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/* Mark which address to use based on which bridge_t we got. */
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node->ipv6_preferred = (tor_addr_family(&bridge->addr) == AF_INET6 &&
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!tor_addr_is_null(&node->ri->ipv6_addr));
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@ -2024,6 +2024,20 @@ test_policies_fascist_firewall_allows_address(void *arg)
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expect_ap); \
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STMT_END
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/** Mock the preferred address function to return zero (prefer IPv4). */
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static int
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mock_fascist_firewall_rand_prefer_ipv6_addr_use_ipv4(void)
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{
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return 0;
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}
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/** Mock the preferred address function to return one (prefer IPv6). */
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static int
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mock_fascist_firewall_rand_prefer_ipv6_addr_use_ipv6(void)
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{
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return 1;
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}
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/** Run unit tests for fascist_firewall_choose_address */
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static void
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test_policies_fascist_firewall_choose_address(void *arg)
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@ -2422,6 +2436,42 @@ test_policies_fascist_firewall_choose_address(void *arg)
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CHECK_CHOSEN_ADDR_RN(fake_rs, fake_node, FIREWALL_DIR_CONNECTION, 1, 1,
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ipv4_dir_ap);
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/* Test ClientAutoIPv6ORPort and pretend we prefer IPv4. */
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memset(&mock_options, 0, sizeof(or_options_t));
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mock_options.ClientAutoIPv6ORPort = 1;
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mock_options.ClientUseIPv4 = 1;
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mock_options.ClientUseIPv6 = 1;
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MOCK(fascist_firewall_rand_prefer_ipv6_addr,
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mock_fascist_firewall_rand_prefer_ipv6_addr_use_ipv4);
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/* Simulate the initialisation of fake_node.ipv6_preferred */
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fake_node.ipv6_preferred = fascist_firewall_prefer_ipv6_orport(
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&mock_options);
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CHECK_CHOSEN_ADDR_RN(fake_rs, fake_node, FIREWALL_OR_CONNECTION, 0, 1,
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ipv4_or_ap);
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CHECK_CHOSEN_ADDR_RN(fake_rs, fake_node, FIREWALL_OR_CONNECTION, 1, 1,
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ipv4_or_ap);
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UNMOCK(fascist_firewall_rand_prefer_ipv6_addr);
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/* Test ClientAutoIPv6ORPort and pretend we prefer IPv6. */
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memset(&mock_options, 0, sizeof(or_options_t));
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mock_options.ClientAutoIPv6ORPort = 1;
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mock_options.ClientUseIPv4 = 1;
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mock_options.ClientUseIPv6 = 1;
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MOCK(fascist_firewall_rand_prefer_ipv6_addr,
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mock_fascist_firewall_rand_prefer_ipv6_addr_use_ipv6);
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/* Simulate the initialisation of fake_node.ipv6_preferred */
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fake_node.ipv6_preferred = fascist_firewall_prefer_ipv6_orport(
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&mock_options);
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CHECK_CHOSEN_ADDR_RN(fake_rs, fake_node, FIREWALL_OR_CONNECTION, 0, 1,
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ipv6_or_ap);
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CHECK_CHOSEN_ADDR_RN(fake_rs, fake_node, FIREWALL_OR_CONNECTION, 1, 1,
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ipv6_or_ap);
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UNMOCK(fascist_firewall_rand_prefer_ipv6_addr);
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done:
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UNMOCK(get_options);
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}
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