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Chris Novakovic c04d2cb200 ipconfig: Write NTP server IPs to /proc/net/ipconfig/ntp_servers 
Distributed filesystems are most effective when the server and client
clocks are synchronised. Embedded devices often use NFS for their
root filesystem but typically do not contain an RTC, so the clocks of
the NFS server and the embedded device will be out-of-sync when the root
filesystem is mounted (and may not be synchronised until late in the
boot process).

Extend ipconfig with the ability to export IP addresses of NTP servers
it discovers to /proc/net/ipconfig/ntp_servers. They can be supplied as
follows:

 - If ipconfig is configured manually via the "ip=" or "nfsaddrs="
   kernel command line parameters, one NTP server can be specified in
   the new "<ntp0-ip>" parameter.
 - If ipconfig is autoconfigured via DHCP, request DHCP option 42 in
   the DHCPDISCOVER message, and record the IP addresses of up to three
   NTP servers sent by the responding DHCP server in the subsequent
   DHCPOFFER message.

ipconfig will only write the NTP server IP addresses it discovers to
/proc/net/ipconfig/ntp_servers, one per line (in the order received from
the DHCP server, if DHCP autoconfiguration is used); making use of these
NTP servers is the responsibility of a user space process (e.g. an
initrd/initram script that invokes an NTP client before mounting an NFS
root filesystem).

Signed-off-by: Chris Novakovic <chris@chrisn.me.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-04-24 13:40:42 -04:00
..
6lowpan License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
9p net/9p/client.c: fix potential refcnt problem of trans module 2018-04-05 21:36:23 -07:00
802 treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
8021q vlan: also check phy_driver ts_info for vlan's real device 2018-04-01 20:53:50 -04:00
appletalk net: Use octal not symbolic permissions 2018-03-26 12:07:48 -04:00
atm net: Use octal not symbolic permissions 2018-03-26 12:07:48 -04:00
ax25 net: Use octal not symbolic permissions 2018-03-26 12:07:48 -04:00
batman-adv Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-04-01 19:49:34 -04:00
bluetooth Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth 2018-04-08 17:19:15 -04:00
bpf bpf: making bpf_prog_test run aware of possible data_end ptr change 2018-04-18 23:34:16 +02:00
bridge net: bridge: disable bridge MTU auto tuning if it was set manually 2018-03-31 22:19:00 -04:00
caif net: caif: fix spelling mistake "UKNOWN" -> "UNKNOWN" 2018-04-19 13:37:10 -04:00
can net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
ceph The big ticket items are: 2018-04-10 12:25:30 -07:00
core net: fib_rules: fix l3mdev netlink attr processing 2018-04-23 23:20:12 -04:00
dcb
dccp dccp: initialize ireq->ir_mark 2018-04-07 22:32:31 -04:00
decnet net: fib_rules: add extack support 2018-04-23 10:21:24 -04:00
dns_resolver KEYS: DNS: limit the length of option strings 2018-04-17 15:17:41 -04:00
dsa net: dsa: Discard frames from unused ports 2018-04-08 10:34:49 -04:00
ethernet
hsr net: hsr: Convert timers to use timer_setup() 2017-10-25 13:00:27 +09:00
ieee802154 inet: frags: fix ip6frag_low_thresh boundary 2018-04-04 12:04:59 -04:00
ife MAINTAINERS: Update Yotam's E-mail 2017-11-01 12:19:03 +09:00
ipv4 ipconfig: Write NTP server IPs to /proc/net/ipconfig/ntp_servers 2018-04-24 13:40:42 -04:00
ipv6 net/ipv6: Fix missing rcu dereferences on from 2018-04-23 16:12:55 -04:00
iucv Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
kcm net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
key net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
l2tp l2tp: hold reference on tunnels printed in l2tp/tunnels debugfs file 2018-04-13 12:17:26 -04:00
l3mdev
lapb treewide: Remove TIMER_FUNC_TYPE and TIMER_DATA_TYPE casts 2017-11-21 16:35:54 -08:00
llc llc: hold llc_sap before release_sock() 2018-04-19 13:54:53 -04:00
mac80211 We have a fair number of patches, but many of them are from the 2018-03-29 16:23:26 -04:00
mac802154 net/mac802154: disambiguate mac80215 vs mac802154 trace events 2018-03-28 22:55:18 +02:00
mpls net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
ncsi net/ncsi: Refactor MAC, VLAN filters 2018-04-17 13:50:58 -04:00
netfilter ipv6: Count interface receive statistics on the ingress netdev 2018-04-17 13:39:51 -04:00
netlabel netlabel: If PF_INET6, check sk_buff ip header version 2018-02-14 14:01:41 -05:00
netlink netlink: fix uninit-value in netlink_sendmsg 2018-04-07 22:32:31 -04:00
netrom net: Use octal not symbolic permissions 2018-03-26 12:07:48 -04:00
nfc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-02-19 18:46:11 -05:00
nsh openvswitch: enable NSH support 2017-11-08 16:12:33 +09:00
openvswitch ovs: Remove rtnl_lock() from ovs_exit_net() 2018-03-29 13:47:54 -04:00
packet net: af_packet: fix race in PACKET_{R|T}X_RING 2018-04-16 11:38:43 -04:00
phonet net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
psample MAINTAINERS: Update Yotam's E-mail 2017-11-01 12:19:03 +09:00
qrtr net: qrtr: add MODULE_ALIAS_NETPROTO macro 2018-04-17 09:58:00 -04:00
rds rds: MP-RDS may use an invalid c_path 2018-04-11 10:24:01 -04:00
rfkill vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
rose net: Use octal not symbolic permissions 2018-03-26 12:07:48 -04:00
rxrpc rxrpc: Fix undefined packet handling 2018-04-04 11:04:08 -04:00
sched net_sched: fix a missing idr_remove() in u32_delete_key() 2018-04-07 12:36:45 -04:00
sctp sctp: do not check port in sctp_inet6_cmp_addr 2018-04-12 22:01:05 -04:00
smc net/smc: fix shutdown in state SMC_LISTEN 2018-04-19 16:38:39 -04:00
strparser strparser: Fix incorrect strp->need_bytes value. 2018-04-12 21:54:59 -04:00
sunrpc rpc_pipefs: fix double-dput() 2018-04-15 23:49:27 -04:00
switchdev net: bridge: Add/del switchdev object on host join/leave 2017-11-10 13:41:40 +09:00
tipc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-04-21 16:32:48 -04:00
tls net/tls: Remove VLA usage 2018-04-12 21:46:10 -04:00
unix af_unix: remove redundant lockdep class 2018-04-04 11:13:40 -04:00
vmw_vsock VSOCK: make af_vsock.ko removable again 2018-04-17 09:44:30 -04:00
wimax License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
wireless Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2018-03-31 23:33:04 -04:00
x25 net: Use octal not symbolic permissions 2018-03-26 12:07:48 -04:00
xfrm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-04-01 19:49:34 -04:00
compat.c net: socket: add __compat_sys_...msg() helpers; remove in-kernel calls to compat syscalls 2018-04-02 20:15:20 +02:00
Kconfig page_pool: refurbish version of page_pool code 2018-04-17 10:50:29 -04:00
Makefile ipx: move Novell IPX protocol support into staging 2017-11-28 13:55:00 +01:00
socket.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2018-04-05 11:56:35 -07:00
sysctl_net.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00