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Salam Noureddine 56022a8fdd ipv4: arp: update neighbour address when a gratuitous arp is received and arp_accept is set 
Gratuitous arp packets are useful in switchover scenarios to update
client arp tables as quickly as possible. Currently, the mac address
of a neighbour is only updated after a locktime period has elapsed
since the last update. In most use cases such delays are unacceptable
for network admins. Moreover, the "updated" field of the neighbour
stucture doesn't record the last time the address of a neighbour
changed but records any change that happens to the neighbour. This is
clearly a bug since locktime uses that field as meaning "addr_updated".
With this observation, I was able to perpetuate a stale address by
sending a stream of gratuitous arp packets spaced less than locktime
apart. With this change the address is updated when a gratuitous arp
is received and the arp_accept sysctl is set.

Signed-off-by: Salam Noureddine <noureddine@aristanetworks.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-02 00:08:38 -05:00
..
9p Nothing really exciting: some groundwork for changing virtio endian, and 2013-11-15 13:28:47 +09:00
802 neigh: convert parms to an array 2013-12-09 20:56:12 -05:00
8021q Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-11-14 16:30:30 +09:00
appletalk net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
atm net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
ax25 net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
batman-adv batman-adv: use batadv_compare_eth for concise 2013-12-26 13:31:33 -05:00
bluetooth Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem 2013-12-13 13:14:28 -05:00
bridge netlink: cleanup rntl_af_register 2014-01-01 23:42:19 -05:00
caif net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
can can: gw: remove obsolete checks 2013-12-21 14:56:21 +01:00
ceph net: 8021q/bluetooth/bridge/can/ceph: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
core net: core functions cleanup 2014-01-01 23:46:09 -05:00
dcb net/*: Fix FSF address in file headers 2013-12-06 12:37:57 -05:00
dccp Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next 2013-12-19 18:37:49 -05:00
decnet Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next 2013-12-19 18:37:49 -05:00
dns_resolver net/*: Fix FSF address in file headers 2013-12-06 12:37:57 -05:00
dsa
ethernet
hsr net/hsr: using kfree_rcu() to simplify the code 2013-12-17 16:32:30 -05:00
ieee802154 ieee802154: space prohibited before that close parenthesis 2013-12-27 13:06:16 -05:00
ipv4 ipv4: arp: update neighbour address when a gratuitous arp is received and arp_accept is set 2014-01-02 00:08:38 -05:00
ipv6 ipv6: namespace cleanups 2014-01-01 23:46:09 -05:00
ipx net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
irda net/irda: Fix FSF address in file headers 2013-12-06 12:37:57 -05:00
iucv net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
key xfrm: export verify_userspi_info for pkfey and netlink interface 2013-12-16 12:54:02 +01:00
l2tp Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next 2013-12-19 18:37:49 -05:00
lapb
llc llc: "foo* bar" should be "foo *bar" 2013-12-27 13:06:15 -05:00
mac80211 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem 2014-01-01 15:39:56 -05:00
mac802154 mac802154: fix following checkpath.pl warning Prefer pr_warn(... to pr_warning(... 2013-12-22 18:53:08 -05:00
mpls ipip: add GSO/TSO support 2013-10-19 19:36:19 -04:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-12-18 16:42:06 -05:00
netlabel netlabel: Fix FSF address in file headers 2013-12-06 12:37:56 -05:00
netlink netlink: cleanup tap related functions 2014-01-01 23:43:36 -05:00
netrom net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
nfc nfc: Fix FSF address in file headers 2013-12-11 10:56:21 -05:00
openvswitch net: Add utility functions to clear rxhash 2013-12-17 16:36:21 -05:00
packet packet: fix "foo * bar" and "(foo*)" problems 2013-12-31 13:38:41 -05:00
phonet Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-11-19 15:50:47 -08:00
rds rds: prevent BUG_ON triggered on congestion update to loopback 2013-12-03 11:54:18 -05:00
rfkill rfkill: Fix FSF address in file headers 2013-12-11 10:56:21 -05:00
rose rose: cleanup checkpatch errors,spaces required 2013-12-22 18:57:58 -05:00
rxrpc net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
sched net, sch: fix the typo in register_qdisc() 2013-12-31 16:44:10 -05:00
sctp sctp: move skb_dst_set() a bit downwards in sctp_packet_transmit() 2013-12-31 14:31:44 -05:00
sunrpc NFS client bugfixes 2013-12-05 13:05:48 -08:00
tipc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-12-18 16:42:06 -05:00
unix Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-12-18 16:42:06 -05:00
vmw_vsock net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
wimax wimax: remove dead code 2013-11-21 13:09:42 -05:00
wireless nl80211: add VHT support for set_bitrate_mask 2013-12-16 16:05:17 +01:00
x25 x25: convert printks to pr_<level> 2013-12-09 20:24:18 -05:00
xfrm xfrm: export verify_userspi_info for pkfey and netlink interface 2013-12-16 12:54:02 +01:00
compat.c net: clamp ->msg_namelen instead of returning an error 2013-11-29 16:12:52 -05:00
Kconfig kernel: remove CONFIG_USE_GENERIC_SMP_HELPERS cleanly 2013-11-21 16:42:27 -08:00
Makefile net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0) 2013-11-03 23:20:14 -05:00
nonet.c
socket.c net: handle error more gracefully in socketpair() 2013-12-10 22:24:13 -05:00
sysctl_net.c net: Update the sysctl permissions handler to test effective uid/gid 2013-10-07 15:57:56 -04:00