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Hangbin Liu e9919a24d3 fib_rules: return 0 directly if an exactly same rule exists when NLM_F_EXCL not supplied 
With commit 153380ec4b ("fib_rules: Added NLM_F_EXCL support to
fib_nl_newrule") we now able to check if a rule already exists. But this
only works with iproute2. For other tools like libnl, NetworkManager,
it still could add duplicate rules with only NLM_F_CREATE flag, like

[localhost ~ ]# ip rule
0:      from all lookup local
32766:  from all lookup main
32767:  from all lookup default
100000: from 192.168.7.5 lookup 5
100000: from 192.168.7.5 lookup 5

As it doesn't make sense to create two duplicate rules, let's just return
0 if the rule exists.

Fixes: 153380ec4b ("fib_rules: Added NLM_F_EXCL support to fib_nl_newrule")
Reported-by: Thomas Haller <thaller@redhat.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2019-05-08 09:32:10 -07:00
..
Makefile bpf: Introduce bpf sk local storage 2019-04-27 09:07:04 -07:00
bpf_sk_storage.c bpf: Use PTR_ERR_OR_ZERO in bpf_fd_sk_storage_update_elem() 2019-05-04 23:20:58 -07:00
datagram.c datagram: remove rendundant 'peeked' argument 2019-04-08 09:51:54 -07:00
datagram.h net/core: Allow the compiler to verify declaration and definition consistency 2019-03-27 13:49:44 -07:00
dev.c net: use indirect calls helpers for ptype hook 2019-05-05 10:38:04 -07:00
dev_addr_lists.c net: dev: Issue NETDEV_PRE_CHANGEADDR 2018-12-13 18:41:38 -08:00
dev_ioctl.c net/core: Document all dev_ioctl() arguments 2019-03-27 13:49:43 -07:00
devlink.c devlink: Change devlink health locking mechanism 2019-05-01 11:07:03 -04:00
drop_monitor.c genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
dst.c net: dst: remove gc leftovers 2019-03-21 13:39:25 -07:00
dst_cache.c net: core: dst_cache_set_ip6: Rename 'addr' parameter to 'saddr' for consistency 2018-03-05 12:52:45 -05:00
ethtool.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-04-05 14:14:19 -07:00
failover.c failover: allow name change on IFF_UP slave interfaces 2019-04-10 22:12:26 -07:00
fib_notifier.c net: Fix fib notifer to return errno 2018-03-29 14:10:30 -04:00
fib_rules.c fib_rules: return 0 directly if an exactly same rule exists when NLM_F_EXCL not supplied 2019-05-08 09:32:10 -07:00
filter.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2019-04-28 08:42:41 -04:00
flow_dissector.c bpf: support BPF_PROG_QUERY for BPF_FLOW_DISSECTOR attach_type 2019-04-25 23:49:06 +02:00
flow_offload.c flow_offload: add flow action infrastructure 2019-02-06 10:38:25 -08:00
gen_estimator.c net: core: protect rate estimator statistics pointer with lock 2018-08-11 12:37:10 -07:00
gen_stats.c Revert: "net: sched: put back q.qlen into a single location" 2019-04-10 12:20:46 -07:00
gro_cells.c gro_cells: make sure device is up in gro_cells_receive() 2019-03-10 11:07:14 -07:00
hwbm.c net: hwbm: Fix unbalanced spinlock in error case 2016-05-25 12:35:09 -07:00
link_watch.c net: linkwatch: add check for netdevice being present to linkwatch_do_dev 2018-09-19 21:06:46 -07:00
lwt_bpf.c netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
lwtunnel.c netlink: make nla_nest_start() add NLA_F_NESTED flag 2019-04-27 17:03:44 -04:00
neighbour.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-05-07 17:22:09 -07:00
net-procfs.c treewide: Switch printk users from %pf and %pF to %ps and %pS, respectively 2019-04-09 14:19:06 +02:00
net-sysfs.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2019-05-07 22:03:58 -07:00
net-sysfs.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
net-traces.c trace: events: add a few neigh tracepoints 2019-02-17 10:33:39 -08:00
net_namespace.c netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
netclassid_cgroup.c cgroup, netclassid: add a preemption point to write_classid 2018-10-23 12:58:17 -07:00
netevent.c netevent: remove automatic variable in register_netevent_notifier() 2015-05-31 00:03:21 -07:00
netpoll.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2019-05-07 22:03:58 -07:00
netprio_cgroup.c cgroup: net: remove left over MODULE_LICENSE tag 2019-04-22 21:50:54 -07:00
page_pool.c page_pool: use DMA_ATTR_SKIP_CPU_SYNC for DMA mappings 2019-02-13 22:00:16 -08:00
pktgen.c xfrm: remove output indirection from xfrm_mode 2019-04-08 09:14:28 +02:00
ptp_classifier.c net/core: work around section mismatch warning for ptp_classifier 2019-04-16 20:46:17 -07:00
request_sock.c ipv4: Namespaceify tcp_max_syn_backlog knob 2016-12-29 11:38:31 -05:00
rtnetlink.c netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
scm.c socket: Add SO_TIMESTAMPING_NEW 2019-02-03 11:17:31 -08:00
secure_seq.c infiniband: i40iw, nes: don't use wall time for TCP sequence numbers 2018-07-11 12:10:19 -06:00
skbuff.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2019-04-22 21:35:55 -07:00
skmsg.c bpf: Stop the psock parser before canceling its work 2019-03-07 15:16:20 +01:00
sock.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2019-04-28 08:42:41 -04:00
sock_diag.c net: sock_diag: Fix spectre v1 gadget in __sock_diag_cmd() 2018-08-14 10:01:24 -07:00
sock_map.c bpf: skmsg, fix psock create on existing kcm/tls port 2018-10-20 00:40:45 +02:00
sock_reuseport.c net/core: Document reuseport_add_sock() bind_inany argument 2019-03-27 13:49:43 -07:00
stream.c tcp: reduce POLLOUT events caused by TCP_NOTSENT_LOWAT 2018-12-04 21:21:18 -08:00
sysctl_net_core.c net: convert rps_needed and rfs_needed to new static branch api 2019-03-23 21:57:38 -04:00
timestamping.c net: skb_defer_rx_timestamp should check for phydev before setting up classify 2015-07-09 14:17:15 -07:00
tso.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
utils.c net: Remove some unneeded semicolon 2018-08-04 13:05:39 -07:00
xdp.c xdp: remove redundant variable 'headroom' 2018-09-01 01:35:53 +02:00