Download Linux Kernel Networking: Implementation and Theory by Rami Rosen PDF
By Rami Rosen
Linux Kernel Networking takes you on a guided in-depth travel of the present Linux networking implementation and the speculation at the back of it. Linux kernel networking is a posh subject, so the publication will not burden you with subject matters in some way regarding networking. This publication also will no longer overload you with bulky line-by-line code walkthroughs ultimately on the topic of what you are trying to find; you can find simply what you would like, with in-depth reasons in each one bankruptcy and a short reference on the finish of every chapter.
Linux Kernel Networking is the one up to date reference advisor to realizing how networking is carried out, and it'll be imperative in future years in view that such a lot of units now use Linux or working structures according to Linux, like Android, and because Linux is so standard within the facts heart enviornment, together with Linux-based virtualization applied sciences like Xen and KVM.
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Extra resources for Linux Kernel Networking: Implementation and Theory
Example text
I discuss this more in the next section. Creating and Sending Generic Netlink Messages A generic netlink message starts with a netlink header, followed by the generic netlink message header, and then there is an optional user specific header. Only after all that do you find the optional payload, as you can see in Figure 2-5. Figure 2-5. Generic netlink message. h) 29 Chapter 2 ■ Netlink Sockets • cmd is a generic netlink message type; each generic family that you register adds its own commands.
The nl80211_policy validation policy array has NL80211_ATTR_MAX elements (each attribute has an entry in the array): • netnsok: true, which means the family can handle network namespaces. • pre_doit: A hook that’s called before the doit() callback. • post_doit: A hook that can, for example, undo locking or any required private tasks after the doit() callback. You can add a command or several commands with the genl_ops structure. Let’s take a look at the definition of genl_ops struct and then at its usage in nl80211: struct genl_ops { u8 cmd; u8 internal_flags; unsigned int flags; const struct nla_policy *policy; int (*doit)(struct sk_buff *skb, 27 Chapter 2 ■ Netlink Sockets int int struct list_head • struct genl_info *info); (*dumpit)(struct sk_buff *skb, struct netlink_callback *cb); (*done)(struct netlink_callback *cb); ops_list; }; cmd: Command identifier (the genl_ops struct defines a single command and its doit/dumpit handlers).
The userspace application must send its subsequent messages to the kernel, specifying this id. The genl_ctrl_resolve() method calls genl_ctrl_probe_by_name(), which in fact sends a generic netlink message to the kernel with the CTRL_CMD_GETFAMILY command. 30 Chapter 2 ■ Netlink Sockets In the kernel, the generic netlink controller ("nlctrl") handles the CTRL_CMD_GETFAMILY command by the ctrl_getfamily() method and returns the family id to userspace. This id was generated when the socket was created.