Source socket refers to the socket used by the end that sends data in network communication. The source socket contains the following elements:

1. Source IP address: refers to the IP address of the device sending data.

2. Source port number: refers to the port number used by the device sending data.

3. Destination IP address: refers to the IP address of the device receiving data.

4. Destination port number: refers to the port number used by the device receiving data.

5. Protocol type: refers to the protocol type used in communication, such as TCP, UDP, etc.

6. Data: refers to the actual data to be sent.