The Linux Kernel
5.11.0-rc4
The Linux kernel user’s and administrator’s guide
Kernel Build System
The Linux kernel firmware guide
Open Firmware and Device Tree
The Linux kernel user-space API guide
Working with the kernel development community
Development tools for the kernel
How to write kernel documentation
Kernel Hacking Guides
Linux Tracing Technologies
Kernel Maintainer Handbook
fault-injection
Kernel Livepatching
The Linux driver implementer’s API guide
Core API Documentation
locking
Accounting
Block
cdrom
Linux CPUFreq - CPU frequency and voltage scaling code in the Linux(TM) kernel
Integrated Drive Electronics (IDE)
Frame Buffer
fpga
Human Interface Devices (HID)
I2C/SMBus Subsystem
Industrial I/O
ISDN
InfiniBand
LEDs
NetLabel
Linux Networking Documentation
netdev FAQ
AF_XDP
Bare UDP Tunnelling Module Documentation
batman-adv
SocketCAN - Controller Area Network
The UCAN Protocol
Hardware Device Drivers
Distributed Switch Architecture
Linux Devlink Documentation
CAIF
Netlink interface for ethtool
IEEE 802.15.4 Developer’s Guide
J1939 Documentation
Linux Networking and Network Devices APIs
MSG_ZEROCOPY
FAILOVER
Net DIM - Generic Network Dynamic Interrupt Moderation
NET_FAILOVER
Page Pool API
PHY Abstraction Layer
phylink
IP-Aliasing
Ethernet Bridging
SNMP counter
Checksum Offloads
Segmentation Offloads
Scaling in the Linux Networking Stack
Kernel TLS
Kernel TLS offload
Linux NFC subsystem
Netdev private dataroom for 6lowpan interfaces
6pack Protocol
ARCnet Hardware
ARCnet
ATM
AX.25
Linux Ethernet Bonding Driver HOWTO
cdc_mbim - Driver for CDC MBIM Mobile Broadband modems
DCCP protocol
DCTCP (DataCenter TCP)
Linux DECnet Networking Layer Information
DNS Resolver Module
Softnet Driver Issues
EQL Driver: Serial IP Load Balancing HOWTO
LC-trie implementation notes
Linux Socket Filtering aka Berkeley Packet Filter (BPF)
Generic HDLC layer
Generic Netlink
Generic networking statistics for netlink users
The Linux kernel GTP tunneling module
Identifier Locator Addressing (ILA)
AppleTalk-IP Decapsulation and AppleTalk-IP Encapsulation
IP dynamic address hack-port v0.03
IPsec
IP Sysctl
IPv6
IPVLAN Driver HOWTO
IPvs-sysctl
Kernel Connection Multiplexor
L2TP
The Linux LAPB Module Interface
How to use packet injection with mac80211
MPLS Sysfs variables
MPTCP Sysfs variables
HOWTO for multiqueue network device support
Netconsole
Netdev features mess and how to get out from it alive
Network Devices, the Kernel, and You!
Netfilter Sysfs variables
NETIF Msg Level
Netfilter Conntrack Sysfs variables
Netfilter’s flowtable infrastructure
Open vSwitch datapath developer documentation
Operational States
Packet MMAP
Linux Phonet protocol family
HOWTO for the linux packet generator
PLIP: The Parallel Line Internet Protocol Device
PPP Generic Driver and Channel Interface
The proc/net/tcp and proc/net/tcp6 variables
How to use radiotap headers
Overview
RDS Architecture
Socket Interface
RDMA for RDS
Congestion Notifications
RDS Protocol
RDS Transport Layer
RDS Kernel Structures
Connection management
The send path
The recv path
Multipath RDS (mprds)
Linux wireless regulatory documentation
RxRPC Network Protocol
SOCKET OPTIONS
SECURITY
EXAMPLE CLIENT USAGE
Linux Kernel SCTP
LSM/SeLinux secid
Seg6 Sysfs variables
Interface statistics
Stream Parser (strparser)
Ethernet switch device driver model (switchdev)
Sysfs tagging
TC Actions - Environmental Rules
Thin-streams and TCP
Team
Timestamping
Linux Kernel TIPC
Transparent proxy support
Universal TUN/TAP device driver
The UDP-Lite protocol (RFC 3828)
Virtual Routing and Forwarding (VRF)
Virtual eXtensible Local Area Networking documentation
Packet Layer to Device Driver
Device Driver to Packet Layer
Linux X.25 Project
XFRM device - offloading the IPsec computations
XFRM proc - /proc/net/xfrm_* files
XFRM
XFRM Syscall
/proc/sys/net/core/xfrm_* Variables:
pcmcia
Power Management
TCM Virtual Device
timers
Serial Peripheral Interface (SPI)
1-Wire Subsystem
Linux Watchdog Support
Linux Virtualization Support
The Linux Input Documentation
Linux Hardware Monitoring
Linux GPU Driver Developer’s Guide
Security Documentation
Linux Sound Subsystem Documentation
Linux Kernel Crypto API
Filesystems in the Linux kernel
Linux Memory Management Documentation
BPF Documentation
USB support
Linux PCI Bus Subsystem
Linux SCSI Subsystem
Assorted Miscellaneous Devices Documentation
Linux Scheduler
MHI
Assembler Annotations
ARM Architecture
ARM64 Architecture
IA-64 Architecture
m68k Architecture
MIPS-specific Documentation
Nios II Specific Documentation
OpenRISC Architecture
PA-RISC Architecture
powerpc
RISC-V architecture
s390 Architecture
SuperH Interfaces Guide
Sparc Architecture
x86-specific Documentation
Xtensa Architecture
ext4 Data Structures and Algorithms
Unsorted Documentation
Atomic Types
Atomic bitops
Memory Barriers
General notification mechanism
Translations
The Linux Kernel
Docs
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Linux Networking Documentation
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XFRM Syscall
View page source
XFRM Syscall
¶
/proc/sys/net/core/xfrm_* Variables:
¶
xfrm_acq_expires - INTEGER
default 30 - hard timeout in seconds for acquire requests