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Remove DECnet support from kernel
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DECnet is an obsolete network protocol that receives more attention
from kernel janitors than users. It belongs in computer protocol
history museum not in Linux kernel.

It has been "Orphaned" in kernel since 2010. The iproute2 support
for DECnet was dropped in 5.0 release. The documentation link on
Sourceforge says it is abandoned there as well.

Leave the UAPI alone to keep userspace programs compiling.
This means that there is still an empty neighbour table
for AF_DECNET.

The table of /proc/sys/net entries was updated to match
current directories and reformatted to be alphabetical.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: David Ahern <dsahern@kernel.org>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Stephen Hemminger authored and David S. Miller committed Aug 22, 2022
1 parent b455dbd commit 1202cdd
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Showing 49 changed files with 10 additions and 12,153 deletions.
4 changes: 0 additions & 4 deletions Documentation/admin-guide/kernel-parameters.txt
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Expand Up @@ -966,10 +966,6 @@

debugpat [X86] Enable PAT debugging

decnet.addr= [HW,NET]
Format: <area>[,<node>]
See also Documentation/networking/decnet.rst.

default_hugepagesz=
[HW] The size of the default HugeTLB page. This is
the size represented by the legacy /proc/ hugepages
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15 changes: 8 additions & 7 deletions Documentation/admin-guide/sysctl/net.rst
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Expand Up @@ -34,13 +34,14 @@ Table : Subdirectories in /proc/sys/net
========= =================== = ========== ==================
Directory Content Directory Content
========= =================== = ========== ==================
core General parameter appletalk Appletalk protocol
unix Unix domain sockets netrom NET/ROM
802 E802 protocol ax25 AX25
ethernet Ethernet protocol rose X.25 PLP layer
ipv4 IP version 4 x25 X.25 protocol
bridge Bridging decnet DEC net
ipv6 IP version 6 tipc TIPC
802 E802 protocol mptcp Multipath TCP
appletalk Appletalk protocol netfilter Network Filter
ax25 AX25 netrom NET/ROM
bridge Bridging rose X.25 PLP layer
core General parameter tipc TIPC
ethernet Ethernet protocol unix Unix domain sockets
ipv4 IP version 4 x25 X.25 protocol
ipv6 IP version 6
========= =================== = ========== ==================

1. /proc/sys/net/core - Network core options
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243 changes: 0 additions & 243 deletions Documentation/networking/decnet.rst
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This file was deleted.

1 change: 0 additions & 1 deletion Documentation/networking/index.rst
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Expand Up @@ -47,7 +47,6 @@ Contents:
cdc_mbim
dccp
dctcp
decnet
dns_resolver
driver
eql
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1 change: 0 additions & 1 deletion Documentation/userspace-api/ioctl/ioctl-number.rst
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Expand Up @@ -308,7 +308,6 @@ Code Seq# Include File Comments
0x89 00-06 arch/x86/include/asm/sockios.h
0x89 0B-DF linux/sockios.h
0x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range
0x89 E0-EF linux/dn.h PROTOPRIVATE range
0x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range
0x8B all linux/wireless.h
0x8C 00-3F WiNRADiO driver
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7 changes: 0 additions & 7 deletions MAINTAINERS
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Expand Up @@ -5719,13 +5719,6 @@ F: include/linux/tfrc.h
F: include/uapi/linux/dccp.h
F: net/dccp/

DECnet NETWORK LAYER
L: linux-decnet-user@lists.sourceforge.net
S: Orphan
W: http://linux-decnet.sourceforge.net
F: Documentation/networking/decnet.rst
F: net/decnet/

DECSTATION PLATFORM SUPPORT
M: "Maciej W. Rozycki" <macro@orcam.me.uk>
L: linux-mips@vger.kernel.org
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2 changes: 0 additions & 2 deletions arch/mips/configs/decstation_64_defconfig
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Expand Up @@ -53,8 +53,6 @@ CONFIG_IPV6_SUBTREES=y
CONFIG_NETWORK_SECMARK=y
CONFIG_IP_SCTP=m
CONFIG_VLAN_8021Q=m
CONFIG_DECNET=m
CONFIG_DECNET_ROUTER=y
# CONFIG_WIRELESS is not set
# CONFIG_UEVENT_HELPER is not set
# CONFIG_FW_LOADER is not set
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2 changes: 0 additions & 2 deletions arch/mips/configs/decstation_defconfig
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Expand Up @@ -49,8 +49,6 @@ CONFIG_IPV6_SUBTREES=y
CONFIG_NETWORK_SECMARK=y
CONFIG_IP_SCTP=m
CONFIG_VLAN_8021Q=m
CONFIG_DECNET=m
CONFIG_DECNET_ROUTER=y
# CONFIG_WIRELESS is not set
# CONFIG_UEVENT_HELPER is not set
# CONFIG_FW_LOADER is not set
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2 changes: 0 additions & 2 deletions arch/mips/configs/decstation_r4k_defconfig
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Expand Up @@ -48,8 +48,6 @@ CONFIG_IPV6_SUBTREES=y
CONFIG_NETWORK_SECMARK=y
CONFIG_IP_SCTP=m
CONFIG_VLAN_8021Q=m
CONFIG_DECNET=m
CONFIG_DECNET_ROUTER=y
# CONFIG_WIRELESS is not set
# CONFIG_UEVENT_HELPER is not set
# CONFIG_FW_LOADER is not set
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2 changes: 0 additions & 2 deletions arch/mips/configs/gpr_defconfig
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Expand Up @@ -69,7 +69,6 @@ CONFIG_IP_NF_RAW=m
CONFIG_IP_NF_ARPTABLES=m
CONFIG_IP_NF_ARPFILTER=m
CONFIG_IP_NF_ARP_MANGLE=m
CONFIG_DECNET_NF_GRABULATOR=m
CONFIG_BRIDGE_NF_EBTABLES=m
CONFIG_BRIDGE_EBT_BROUTE=m
CONFIG_BRIDGE_EBT_T_FILTER=m
Expand Down Expand Up @@ -99,7 +98,6 @@ CONFIG_ATM_MPOA=m
CONFIG_ATM_BR2684=m
CONFIG_BRIDGE=m
CONFIG_VLAN_8021Q=m
CONFIG_DECNET=m
CONFIG_LLC2=m
CONFIG_ATALK=m
CONFIG_DEV_APPLETALK=m
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2 changes: 0 additions & 2 deletions arch/mips/configs/mtx1_defconfig
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Expand Up @@ -116,7 +116,6 @@ CONFIG_IP6_NF_FILTER=m
CONFIG_IP6_NF_TARGET_REJECT=m
CONFIG_IP6_NF_MANGLE=m
CONFIG_IP6_NF_RAW=m
CONFIG_DECNET_NF_GRABULATOR=m
CONFIG_BRIDGE_NF_EBTABLES=m
CONFIG_BRIDGE_EBT_BROUTE=m
CONFIG_BRIDGE_EBT_T_FILTER=m
Expand Down Expand Up @@ -146,7 +145,6 @@ CONFIG_ATM_MPOA=m
CONFIG_ATM_BR2684=m
CONFIG_BRIDGE=m
CONFIG_VLAN_8021Q=m
CONFIG_DECNET=m
CONFIG_LLC2=m
CONFIG_ATALK=m
CONFIG_DEV_APPLETALK=m
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2 changes: 0 additions & 2 deletions arch/mips/configs/rm200_defconfig
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Expand Up @@ -116,7 +116,6 @@ CONFIG_IP6_NF_FILTER=m
CONFIG_IP6_NF_TARGET_REJECT=m
CONFIG_IP6_NF_MANGLE=m
CONFIG_IP6_NF_RAW=m
CONFIG_DECNET_NF_GRABULATOR=m
CONFIG_BRIDGE_NF_EBTABLES=m
CONFIG_BRIDGE_EBT_BROUTE=m
CONFIG_BRIDGE_EBT_T_FILTER=m
Expand All @@ -137,7 +136,6 @@ CONFIG_BRIDGE_EBT_REDIRECT=m
CONFIG_BRIDGE_EBT_SNAT=m
CONFIG_BRIDGE_EBT_LOG=m
CONFIG_BRIDGE=m
CONFIG_DECNET=m
CONFIG_NET_SCHED=y
CONFIG_NET_SCH_CBQ=m
CONFIG_NET_SCH_HTB=m
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2 changes: 0 additions & 2 deletions arch/powerpc/configs/ppc6xx_defconfig
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Expand Up @@ -243,8 +243,6 @@ CONFIG_ATM_LANE=m
CONFIG_ATM_BR2684=m
CONFIG_BRIDGE=m
CONFIG_VLAN_8021Q=m
CONFIG_DECNET=m
CONFIG_DECNET_ROUTER=y
CONFIG_ATALK=m
CONFIG_DEV_APPLETALK=m
CONFIG_IPDDP=m
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