networking:generic_netlink_howto
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networking:generic_netlink_howto [2016/11/07 17:49] KąMykolas Fix broken internal links. (No other way to build index?) |
networking:generic_netlink_howto [2017/05/18 15:45] (current) Yaron_Shragai genl_register_ops is deprecated - provided appropriate replacement information. |
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| =====Contents===== | =====Contents===== | ||
| - | * [[#Generic_Netlink_By_Example|1 Generic Netlink By Example]] | + | * [[#Generic Netlink By Example|1 Generic Netlink By Example]] |
| - | * [[#Registering_A_Family|1.1 Registering A Family]] | + | * [[#Registering A Family|1.1 Registering A Family]] |
| - | * [[#Kernel_Communication|1.2 Kernel Communication]] | + | * [[#Kernel Communication|1.2 Kernel Communication]] |
| - | * [[#Sending_Messages|1.2.1 Sending Messages]] | + | * [[#Sending Messages|1.2.1 Sending Messages]] |
| - | * [[#Receiving_Messages|1.2.2 Receiving Messages]] | + | * [[#Receiving Messages|1.2.2 Receiving Messages]] |
| - | * [[#Userspace_Communication|1.3 Userspace Communication]] | + | * [[#Userspace Communication|1.3 Userspace Communication]] |
| - | * [[#Architectural_Overview|2 Architectural Overview]] | + | * [[#Architectural Overview|2 Architectural Overview]] |
| - | * [[#Implementation_Details|3 Implementation Details]] | + | * [[#Implementation Details|3 Implementation Details]] |
| - | * [[#Message_Format|3.1 Message Format]] | + | * [[#Message Format|3.1 Message Format]] |
| - | * [[#Data_Structures|3.2 Data Structures]] | + | * [[#Data Structures|3.2 Data Structures]] |
| - | * [[#The_genl_family_Structure|3.2.1 The genl_family Structure]] | + | * [[#The genl_family Structure|3.2.1 The genl_family Structure]] |
| - | * [[#The_genl_ops_Structure|3.2.2 The genl_ops Structure]] | + | * [[#The genl_ops Structure|3.2.2 The genl_ops Structure]] |
| - | * [[#The_genl_info_Structure|3.2.3 The genl_info Structure]] | + | * [[#The genl_info Structure|3.2.3 The genl_info Structure]] |
| - | * [[#The_nla_policy_Structure|3.2.4 The nla_policy Structure]] | + | * [[#The nla_policy Structure|3.2.4 The nla_policy Structure]] |
| * [[#Recommendations|4 Recommendations]] | * [[#Recommendations|4 Recommendations]] | ||
| - | * [[#Attributes_And_Message_Payloads|4.1 Attributes And Message Payloads]] | + | * [[#Attributes And Message Payloads|4.1 Attributes And Message Payloads]] |
| - | * [[#Operation_Granularity|4.2 Operation Granularity]] | + | * [[#Operation Granularity|4.2 Operation Granularity]] |
| - | * [[#Acknowledgment_and_Error_Reporting|4.3 Acknowledgment and Error Reporting]] | + | * [[#Acknowledgment and Error Reporting|4.3 Acknowledgment and Error Reporting]] |
| * [[#References|5 References]] | * [[#References|5 References]] | ||
| Line 38: | Line 38: | ||
| This section deals with the Generic Netlink subsystem in the Linux kernel and | This section deals with the Generic Netlink subsystem in the Linux kernel and | ||
| provides a simple example of how in-kernel users can make use of the Generic | provides a simple example of how in-kernel users can make use of the Generic | ||
| - | Netlink API. Don't forget to review section #4, "Recommendations", before | + | Netlink API. Don't forget to review section #4, "Recommendations", before writing any code as it can save you, and the people who review your code, |
| - | [[https://twitter.com/redgage | writing]] any code as it can save you, and the people who review your code, | + | |
| lots of time! | lots of time! | ||
| Line 119: | Line 118: | ||
| if (rc != 0) | if (rc != 0) | ||
| goto failure;</code> | goto failure;</code> | ||
| + | |||
| This call registers the new family name with the Generic Netlink mechanism and | This call registers the new family name with the Generic Netlink mechanism and | ||
| requests a new channel number which is stored in the genl_family struct, | requests a new channel number which is stored in the genl_family struct, | ||
| Line 132: | Line 131: | ||
| if (rc != 0) | if (rc != 0) | ||
| goto failure;</code> | goto failure;</code> | ||
| + | |||
| + | NOTE: This function doesn't exist past linux 3.12. | ||
| + | Up to linux 4.10, use genl_register_family_with_ops(). | ||
| + | On 4.10 and later, include a reference to your genl_ops struct as an element | ||
| + | in the genl_family struct (element .ops), as well as the number of commands | ||
| + | (element .n_ops). | ||
| This call registers the DOC_EXMPL_C_ECHO operation in association with the | This call registers the DOC_EXMPL_C_ECHO operation in association with the | ||
| Line 441: | Line 446: | ||
| - [[http://people.suug.ch/~tgr/libnl|http://people.suug.ch/~tgr/libnl]] | - [[http://people.suug.ch/~tgr/libnl|http://people.suug.ch/~tgr/libnl]] | ||
| + | NOTE: This link is no longer valid. Try [[http://www.infradead.org/~tgr/libnl|http://www.infradead.org/~tgr/libnl]] | ||
networking/generic_netlink_howto.1478540986.txt.gz · Last modified: 2016/11/07 17:49 by KąMykolas
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