By Christian Benvenuti
If you have ever questioned how Linux incorporates out the complex initiatives assigned to it by means of the IP protocols - or in case you simply are looking to know about glossy networking via real-life examples - realizing Linux community Internals is for you. This e-book sincerely explains the underlying thoughts and teaches you the way to stick with the particular C code that implements it. even though a few history within the TCP/IP protocols is beneficial, you could research greatly from this article concerning the protocols themselves and their makes use of. And for those who have already got a base wisdom of C, you should use the book's code walkthroughs to determine precisely what this refined a part of the Linux kernel is doing.
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Additional resources for Understanding Linux Network Internals: Guided Tour to Networking in Linux
Depending on the actual routine to which the function pointer is initialized, a transparent L3-to-L2 address resolution may take place (for example, IPv4 packets go through ARP). When the address resolution is unnecessary, a different routine is used. See Part VI for a detailed discussion on this interface. We see in the preceding examples how function pointers can be employed as interfaces between kernel components or as generic mechanisms to invoke the right function handler at the right time based on the result of something done by a different subsystem.
That function is used by TCP to push a data segment down to the IP layer for transmission. In Chapter 22, you will also see how IPv4 uses cb to store information about IP fragmentation. unsigned int csum unsigned char ip_summed These represent the checksum and associated status flag. Their use is described in Chapter 19. unsigned char cloned A boolean flag that, when set, indicates that this structure is a clone of another sk_buff buffer. ” unsigned char pkt_type This field classifies the type of frame based on its L2 destination address.
Sometimes, however, that is not possible or it may take a long time, even when a project has valuable features and is well implemented. Common reasons include: • The code may not have been written following the guidelines in Documentation/ CodingStyle. • Another major project that provides the same functionality has been around for some time and has already received the green light from the Linux community and from the key kernel developers that maintain the associated kernel area. • There is too much overlap with another kernel component.