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Failed to kill the tcp connection that using IPv4-mapped IPv6 address (e.g. ctdb_killtcp eth0 ::ffff:192.168.200.44:2049 ::ffff:192.168.200.45:863). When the ctdb_killtcp is used to kill the tcp connection, the IPs and ports in the connection will be parsed to conn.client and conn.server (call stack: main->ctdb_sock_addr_from_string->ip_from_string). In the ip_from_string, as we are using IPv4-mapped IPv6 addresses, the ipv6_from_string will be used to parse ip to addr.ip6 first. The next step the ipv4_from_string will be used to reparse ip to addr.ip. As a result, the data that dump from conn.server is "2 0 8 1 192 168 200 44 0 0 0 0 0 0 0 0 0 0 255 255 192 168 200 44 0 0 0 0", the data from conn.client is "2 0 3 95 192 168 200 45 0 0 0 0 0 0 0 0 0 0 255 255 192 168 200 45 0 0 0 0". The connection will be add to conn_list by ctdb_connection_list_add. Then the reset_connections_send uses conn_list as parameter to start to reset connections in the conn_list. In the reset_connections_send, the database "connections" will be created. The connections from conn_list will be written to the database(call db_hash_add), and use the data that dump from conn_client and conn_server as key. In the reset_connections_capture_tcp_handler, the ctdb_sys_read_tcp_packet will receive data on the raw socket. And extract the IPs and ports from the tcp packet. when extracting IP and port, the tcp4_extract OR tcp6_extract will be used. Then we got the new conn.client and conn.server. the data that dump from the conn.server is "2 0 8 1 192 168 200 44 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0", the data from conn.client is "2 0 3 95 192 168 200 45 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0". Finally, we use the data as key to check if this connection is one being reset(call db_hash_delete). The db_hash_delete will return ENOENT. Because the two key that being used by db_hash_delete and db_hash_add are different. So, the TCP RST will be NOT sent for the connection forever. We should initialize addr struct to zero before reparsing as IPV4 in the ip_from_string. BUG: https://bugzilla.samba.org/show_bug.cgi?id=13839 Signed-off-by: Zhu Shangzhong <zhu.shangzhong@zte.com.cn> Reviewed-by: Martin Schwenke <martin@meltin.net> Reviewed-by: Amitay Isaacs <amitay@samba.org>
This is the release version of CTDB, a clustered implementation of TDB database used by Samba and other projects to store temporary data. This software is freely distributable under the GNU public license, a copy of which you should have received with this software (in a file called COPYING). For documentation on CTDB, please visit CTDB website http://ctdb.samba.org.