[CVPN-2539] remove IP addresses on TUN interface drop

[xv-piotr-haber]

Description

Tun-rs tries to open existing TUN interface with specified name if it already exists. But when adding IP address to it an error may occur if that address is already assigned to the interface. To allow lightway to re-use existing TUN interface remove all addresses on close, so when restarted lightway can assign them successfully again.
The error only occurs on windows.

Motivation and Context

We want to be able to control TUN interface life cycle outside of lightway.

How Has This Been Tested?

Created WinTUN interface in external program and started lightway to verify interface is used and usable.
Tested repeated use of the same interface by new lightway instances.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• The correct base branch is being used, if not main

[github-actions]

Code coverage summary for 1be766c:

Filename                                                          Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
lightway-app-utils/src/args/cipher.rs                                   5                 5     0.00%           1                 1     0.00%           5                 5     0.00%           0                 0         -
lightway-app-utils/src/args/connection_type.rs                          8                 8     0.00%           2                 2     0.00%           8                 8     0.00%           0                 0         -
lightway-app-utils/src/args/duration.rs                               121                22    81.82%          11                 5    54.55%          64                15    76.56%           0                 0         -
lightway-app-utils/src/args/ip_map.rs                                  27                27     0.00%           5                 5     0.00%          19                19     0.00%           0                 0         -
lightway-app-utils/src/args/keyshare.rs                                 5                 5     0.00%           1                 1     0.00%           5                 5     0.00%           0                 0         -
lightway-app-utils/src/args/logging.rs                                 37                37     0.00%           3                 3     0.00%          31                31     0.00%           0                 0         -
lightway-app-utils/src/args/nonzero_duration.rs                       128                24    81.25%          10                 4    60.00%          68                16    76.47%           0                 0         -
lightway-app-utils/src/connection_ticker.rs                           229                17    92.58%          28                 4    85.71%         126                15    88.10%           0                 0         -
lightway-app-utils/src/dplpmtud_timer.rs                              209                13    93.78%          22                 4    81.82%         117                11    90.60%           0                 0         -
lightway-app-utils/src/event_stream.rs                                 19                 0   100.00%           3                 0   100.00%          11                 0   100.00%           0                 0         -
lightway-app-utils/src/metrics.rs                                       4                 4     0.00%           2                 2     0.00%           4                 4     0.00%           0                 0         -
lightway-app-utils/src/network_change_monitor.rs                       72                72     0.00%           6                 6     0.00%          49                49     0.00%           0                 0         -
lightway-app-utils/src/packet_codec.rs                                  2                 2     0.00%           1                 1     0.00%           1                 1     0.00%           0                 0         -
lightway-app-utils/src/sockopt/ip_mtu_discover.rs                      81                81     0.00%           6                 6     0.00%          72                72     0.00%           0                 0         -
lightway-app-utils/src/sockopt/ip_pktinfo.rs                           14                 1    92.86%           1                 0   100.00%          16                 1    93.75%           0                 0         -
lightway-app-utils/src/tun.rs                                         366               366     0.00%          36                36     0.00%         231               231     0.00%           0                 0         -
lightway-app-utils/src/utils.rs                                        21                21     0.00%           1                 1     0.00%          11                11     0.00%           0                 0         -
lightway-client/src/config.rs                                         292                96    67.12%          13                 6    53.85%         201                62    69.15%           0                 0         -
lightway-client/src/dns_manager.rs                                     18                18     0.00%           4                 4     0.00%          16                16     0.00%           0                 0         -
lightway-client/src/io/inside/tun.rs                                   82                82     0.00%          12                12     0.00%          60                60     0.00%           0                 0         -
lightway-client/src/io/outside.rs                                      14                14     0.00%           2                 2     0.00%          12                12     0.00%           0                 0         -
lightway-client/src/io/outside/tcp.rs                                  92                92     0.00%          13                13     0.00%          59                59     0.00%           0                 0         -
lightway-client/src/io/outside/udp.rs                                 170               170     0.00%          18                18     0.00%         111               111     0.00%           0                 0         -
lightway-client/src/io/outside/udp/batch_receive.rs                    99                13    86.87%          11                 1    90.91%          84                13    84.52%           0                 0         -
lightway-client/src/keepalive.rs                                      615                44    92.85%          55                 6    89.09%         330                25    92.42%           0                 0         -
lightway-client/src/lib.rs                                           1267               691    45.46%         102                53    48.04%         845               499    40.95%           0                 0         -
lightway-client/src/main.rs                                           351               351     0.00%          20                20     0.00%         233               233     0.00%           0                 0         -
lightway-client/src/platform/linux/dns_manager.rs                     118                91    22.88%          14                 9    35.71%          87                62    28.74%           0                 0         -
lightway-client/src/platform/linux/dns_manager/direct_file.rs         106                42    60.38%          12                 6    50.00%          65                29    55.38%           0                 0         -
lightway-client/src/platform/linux/dns_manager/resolvconf.rs           61                61     0.00%           8                 8     0.00%          52                52     0.00%           0                 0         -
lightway-client/src/platform/linux/dns_manager/resolvectl.rs           41                41     0.00%           5                 5     0.00%          34                34     0.00%           0                 0         -
lightway-client/src/route_manager.rs                                 1148               166    85.54%          75                 6    92.00%         636                84    86.79%           0                 0         -
lightway-core/src/borrowed_bytesmut.rs                                373                 0   100.00%          24                 0   100.00%         185                 0   100.00%           0                 0         -
lightway-core/src/builder_predicates.rs                                24                12    50.00%           4                 2    50.00%          24                12    50.00%           0                 0         -
lightway-core/src/cipher.rs                                            13                 0   100.00%           2                 0   100.00%          10                 0   100.00%           0                 0         -
lightway-core/src/connection.rs                                      1795               958    46.63%          74                29    60.81%        1276               655    48.67%           0                 0         -
lightway-core/src/connection/builders.rs                              252                46    81.75%          22                 8    63.64%         260                53    79.62%           0                 0         -
lightway-core/src/connection/dplpmtud.rs                             1741                81    95.35%          63                 0   100.00%         830                 7    99.16%           0                 0         -
lightway-core/src/connection/expresslane.rs                            27                11    59.26%           4                 1    75.00%          36                 7    80.56%           0                 0         -
lightway-core/src/connection/fragment_map.rs                          366                 6    98.36%          25                 0   100.00%         254                 3    98.82%           0                 0         -
lightway-core/src/connection/io_adapter.rs                            877               149    83.01%          55                 8    85.45%         467                95    79.66%           0                 0         -
lightway-core/src/connection/key_update.rs                             34                13    61.76%           5                 0   100.00%          38                19    50.00%           0                 0         -
lightway-core/src/context.rs                                          214                51    76.17%          28                11    60.71%         235                64    72.77%           0                 0         -
lightway-core/src/context/ip_pool.rs                                    8                 3    62.50%           1                 0   100.00%           5                 0   100.00%           0                 0         -
lightway-core/src/context/server_auth.rs                               37                37     0.00%           4                 4     0.00%          26                26     0.00%           0                 0         -
lightway-core/src/encoding_request_states.rs                            3                 0   100.00%           1                 0   100.00%           3                 0   100.00%           0                 0         -
lightway-core/src/gso.rs                                              900               143    84.11%          29                 6    79.31%         424                92    78.30%           0                 0         -
lightway-core/src/io.rs                                                10                10     0.00%           3                 3     0.00%           9                 9     0.00%           0                 0         -
lightway-core/src/keyshare.rs                                           5                 0   100.00%           1                 0   100.00%           5                 0   100.00%           0                 0         -
lightway-core/src/lib.rs                                                9                 0   100.00%           3                 0   100.00%           9                 0   100.00%           0                 0         -
lightway-core/src/metrics.rs                                           81                71    12.35%          33                29    12.12%          73                63    13.70%           0                 0         -
lightway-core/src/packet.rs                                            38                10    73.68%           4                 1    75.00%          30                 6    80.00%           0                 0         -
lightway-core/src/plugin.rs                                           307                17    94.46%          22                 4    81.82%         148                10    93.24%           0                 0         -
lightway-core/src/tls/mod.rs                                            4                 4     0.00%           1                 1     0.00%           3                 3     0.00%           0                 0         -
lightway-core/src/utils.rs                                            334                26    92.22%          22                 2    90.91%         165                17    89.70%           0                 0         -
lightway-core/src/version.rs                                           93                 0   100.00%          17                 0   100.00%          82                 0   100.00%           0                 0         -
lightway-core/src/wire.rs                                             438                42    90.41%          29                 1    96.55%         235                12    94.89%           0                 0         -
lightway-core/src/wire/auth_failure.rs                                 27                 1    96.30%           3                 0   100.00%          17                 0   100.00%           0                 0         -
lightway-core/src/wire/auth_request.rs                                684                57    91.67%          34                 1    97.06%         351                24    93.16%           0                 0         -
lightway-core/src/wire/auth_success_with_config_ipv4.rs               222                 3    98.65%          11                 0   100.00%         124                 0   100.00%           0                 0         -
lightway-core/src/wire/data.rs                                         51                 1    98.04%           5                 0   100.00%          33                 0   100.00%           0                 0         -
lightway-core/src/wire/data_frag.rs                                   127                 1    99.21%          14                 0   100.00%          80                 0   100.00%           0                 0         -
lightway-core/src/wire/encoding_request.rs                             82                 2    97.56%           6                 0   100.00%          42                 1    97.62%           0                 0         -
lightway-core/src/wire/encoding_response.rs                            82                 2    97.56%           6                 0   100.00%          42                 1    97.62%           0                 0         -
lightway-core/src/wire/expresslane_config.rs                          192                 1    99.48%          10                 0   100.00%         110                 0   100.00%           0                 0         -
lightway-core/src/wire/expresslane_data.rs                           1330                69    94.81%          48                 5    89.58%         679                37    94.55%           0                 0         -
lightway-core/src/wire/ping.rs                                         95                 2    97.89%           7                 0   100.00%          59                 0   100.00%           0                 0         -
lightway-core/src/wire/pong.rs                                        109                 2    98.17%           8                 0   100.00%          72                 0   100.00%           0                 0         -
lightway-core/src/wire/server_config.rs                                69                 2    97.10%           4                 0   100.00%          37                 0   100.00%           0                 0         -
lightway-server/src/auth.rs                                           273                49    82.05%          22                 6    72.73%         171                28    83.63%           0                 0         -
lightway-server/src/config.rs                                          26                26     0.00%           1                 1     0.00%          46                46     0.00%           0                 0         -
lightway-server/src/connection.rs                                     137               137     0.00%          11                11     0.00%         110               110     0.00%           0                 0         -
lightway-server/src/connection_manager.rs                             339               339     0.00%          40                40     0.00%         294               294     0.00%           0                 0         -
lightway-server/src/connection_manager/connection_map.rs              407                16    96.07%          21                 1    95.24%         228                 7    96.93%           0                 0         -
lightway-server/src/io/inside/tun.rs                                   46                46     0.00%          10                10     0.00%          32                32     0.00%           0                 0         -
lightway-server/src/io/outside/tcp.rs                                  93                93     0.00%          10                10     0.00%          68                68     0.00%           0                 0         -
lightway-server/src/io/outside/udp.rs                                 458               458     0.00%          25                25     0.00%         317               317     0.00%           0                 0         -
lightway-server/src/io/outside/udp/batch_receive.rs                   467                19    95.93%          20                 1    95.00%         265                15    94.34%           0                 0         -
lightway-server/src/io/outside/udp/cmsg.rs                            208                48    76.92%          16                 3    81.25%         171                43    74.85%           0                 0         -
lightway-server/src/ip_manager.rs                                     542                50    90.77%          22                 4    81.82%         242                23    90.50%           0                 0         -
lightway-server/src/ip_manager/ip_pool.rs                             545                 0   100.00%          28                 0   100.00%         257                 0   100.00%           0                 0         -
lightway-server/src/lib.rs                                            375               375     0.00%          18                18     0.00%         251               251     0.00%           0                 0         -
lightway-server/src/main.rs                                           248               248     0.00%          10                10     0.00%         131               131     0.00%           0                 0         -
lightway-server/src/metrics.rs                                        254               250     1.57%          85                83     2.35%         215               211     1.86%           0                 0         -
lightway-server/src/statistics.rs                                     132                59    55.30%           8                 4    50.00%          90                39    56.67%           0                 0         -
uniffi-bindgen/src/uniffi-bindgen.rs                                    3                 3     0.00%           1                 1     0.00%           3                 3     0.00%           0                 0         -
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL                                                               21428              6726    68.61%        1483               594    59.95%       13032              4679    64.10%           0                 0         -

✅ Region coverage 68% passes
✅ Line coverage 64% passes