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linux-stable/net/ipv4
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Xin Long daa11cc841 ipv4: not do cache for local delivery if bc_forwarding is enabled 
[ Upstream commit 0a90478b93 ]

With the topo:

    h1 ---| rp1            |
          |     route  rp3 |--- h3 (192.168.200.1)
    h2 ---| rp2            |

If rp1 bc_forwarding is set while rp2 bc_forwarding is not, after
doing "ping 192.168.200.255" on h1, then ping 192.168.200.255 on
h2, and the packets can still be forwared.

This issue was caused by the input route cache. It should only do
the cache for either bc forwarding or local delivery. Otherwise,
local delivery can use the route cache for bc forwarding of other
interfaces.

This patch is to fix it by not doing cache for local delivery if
all.bc_forwarding is enabled.

Note that we don't fix it by checking route cache local flag after
rt_cache_valid() in "local_input:" and "ip_mkroute_input", as the
common route code shouldn't be touched for bc_forwarding.

Fixes: 5cbf777cfd ("route: add support for directed broadcast forwarding")
Reported-by: Jianlin Shi <jishi@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-11 12:20:47 +02:00
..
bpfilter bpfilter: remove trailing newline 2018-07-24 14:10:42 -07:00
netfilter netfilter: ipt_CLUSTERIP: fix warning unused variable cn 2019-03-23 20:09:57 +01:00
af_inet.c gso_segment: Reset skb->mac_len after modifying network header 2018-09-13 12:09:32 -07:00
ah4.c net: use -ENOSPC for transient busy indication 2017-11-03 22:11:17 +08:00
arp.c proc: introduce proc_create_net{,_data} 2018-05-16 07:24:30 +02:00
cipso_ipv4.c net: avoid use IPCB in cipso_v4_error 2019-03-10 07:17:19 +01:00
datagram.c
devinet.c route: add support for directed broadcast forwarding 2018-07-29 12:37:06 -07:00
esp4.c esp4: add length check for UDP encapsulation 2019-05-25 18:23:41 +02:00
esp4_offload.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next 2018-07-27 09:33:37 -07:00
fib_frontend.c ipv4: Return error for RTA_VIA attribute 2019-03-10 07:17:19 +01:00
fib_lookup.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fib_notifier.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fib_rules.c net: fib_rules: add extack support 2018-04-23 10:21:24 -04:00
fib_semantics.c net: ipv4: update fnhe_pmtu when first hop's MTU changes 2018-10-10 22:44:46 -07:00
fib_trie.c net: ipv4: Fix memory leak in network namespace dismantle 2019-01-31 08:14:32 +01:00
fou.c net: fou: do not use guehdr after iptunnel_pull_offloads in gue_udp_recv 2019-04-27 09:36:31 +02:00
gre_demux.c net: ip_gre: use erspan key field for tunnel lookup 2019-02-06 17:30:06 +01:00
gre_offload.c Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net 2018-07-03 10:29:26 +09:00
icmp.c net: Add __icmp_send helper. 2019-03-10 07:17:19 +01:00
igmp.c ipv4/igmp: fix build error if !CONFIG_IP_MULTICAST 2019-06-04 08:02:31 +02:00
inet_connection_sock.c inet: make sure to grab rcu_read_lock before using ireq->ireq_opt 2018-10-02 15:52:12 -07:00
inet_diag.c inet_diag: fix reporting cgroup classid and fallback to priority 2019-02-27 10:08:58 +01:00
inet_fragment.c net: IP defrag: encapsulate rbtree defrag code into callable functions 2019-04-27 09:36:33 +02:00
inet_hashtables.c bpf: Enable BPF_PROG_TYPE_SK_REUSEPORT bpf prog in reuseport selection 2018-08-11 01:58:46 +02:00
inet_timewait_sock.c soreuseport: initialise timewait reuseport field 2018-04-07 22:32:32 -04:00
inetpeer.c net: ipv4: use a dedicated counter for icmp_v4 redirect packets 2019-02-23 09:07:24 +01:00
ip_forward.c net: clear skb->tstamp in forwarding paths 2019-01-09 17:38:31 +01:00
ip_fragment.c net: IP defrag: encapsulate rbtree defrag code into callable functions 2019-04-27 09:36:33 +02:00
ip_gre.c net: ip_gre: fix possible use-after-free in erspan_rcv 2019-04-17 08:38:43 +02:00
ip_input.c vrf: check accept_source_route on the original netdevice 2019-04-17 08:38:42 +02:00
ip_options.c vrf: check accept_source_route on the original netdevice 2019-04-17 08:38:42 +02:00
ip_output.c ipv4: ip_do_fragment: Preserve skb_iif during fragmentation 2019-05-05 14:42:36 +02:00
ip_sockglue.c ip: on queued skb use skb_header_pointer instead of pskb_may_pull 2019-01-22 21:40:31 +01:00
ip_tunnel.c ip: validate header length on virtual device xmit 2019-01-09 17:38:31 +01:00
ip_tunnel_core.c ip_tunnel: don't force DF when MTU is locked 2018-11-23 08:17:02 +01:00
ip_vti.c vti4: ipip tunnel deregistration fixes. 2019-05-25 18:23:41 +02:00
ipcomp.c
ipconfig.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2018-06-06 18:39:49 -07:00
ipip.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
ipmr.c ipv4: Fix potential Spectre v1 vulnerability 2019-01-09 17:38:31 +01:00
ipmr_base.c net: ipmr: fix unresolved entry dumps 2018-10-17 22:35:42 -07:00
Kconfig net: remove blank lines at end of file 2018-07-24 14:10:43 -07:00
Makefile net: remove blank lines at end of file 2018-07-24 14:10:43 -07:00
metrics.c net: metrics: add proper netlink validation 2018-06-05 12:29:43 -04:00
netfilter.c netfilter: utils: move nf_ip_checksum* from ipv4 to utils 2018-07-16 17:51:48 +02:00
netlink.c ipv4: Add ICMPv6 support when parse route ipproto 2019-03-10 07:17:17 +01:00
ping.c net: add helpers checking if socket can be bound to nonlocal address 2018-08-01 09:50:04 -07:00
proc.c ip: discard IPv4 datagrams with overlapping segments. 2018-08-05 17:16:46 -07:00
protocol.c
raw.c ipv4: Fix raw socket lookup for local traffic 2019-05-16 19:41:29 +02:00
raw_diag.c net: ipv6: add second dif to raw socket lookups 2017-08-07 11:39:22 -07:00
route.c ipv4: not do cache for local delivery if bc_forwarding is enabled 2019-06-11 12:20:47 +02:00
syncookies.c tcp: handle inet_csk_reqsk_queue_add() failures 2019-03-19 13:12:39 +01:00
sysctl_net_ipv4.c ipv4: set the tcp_min_rtt_wlen range from 0 to one day 2019-05-02 09:58:59 +02:00
tcp.c tcp: do not report TCP_CM_INQ of 0 for closed connections 2019-03-19 13:12:39 +01:00
tcp_bbr.c tcp_bbr: apply PROBE_RTT cwnd cap even if acked==0 2018-08-22 21:45:32 -07:00
tcp_bic.c tcp: consolidate congestion control undo functions 2017-08-06 21:25:10 -07:00
tcp_cdg.c tcp: cdg: make struct tcp_cdg static 2017-10-16 21:24:25 +01:00
tcp_cong.c tcp: Namespace-ify sysctl_tcp_default_congestion_control 2017-11-15 14:09:52 +09:00
tcp_cubic.c tcp: consolidate congestion control undo functions 2017-08-06 21:25:10 -07:00
tcp_dctcp.c tcp: Ensure DCTCP reacts to losses 2019-04-17 08:38:41 +02:00
tcp_diag.c net: sock: replace sk_state_load with inet_sk_state_load and remove sk_state_store 2017-12-20 14:00:25 -05:00
tcp_fastopen.c tcp: pause Fast Open globally after third consecutive timeout 2017-12-13 15:51:12 -05:00
tcp_highspeed.c tcp: consolidate congestion control undo functions 2017-08-06 21:25:10 -07:00
tcp_htcp.c
tcp_hybla.c
tcp_illinois.c net/tcp/illinois: replace broken algorithm reference link 2018-02-28 12:03:47 -05:00
tcp_input.c tcp: tcp_grow_window() needs to respect tcp_space() 2019-04-27 09:36:31 +02:00
tcp_ipv4.c tcp: fix a potential NULL pointer dereference in tcp_sk_exit 2019-04-17 08:38:41 +02:00
tcp_lp.c
tcp_metrics.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
tcp_minisocks.c tcp: do not restart timewait timer on rst reception 2018-08-31 23:10:35 -07:00
tcp_nv.c tcp_nv: fix potential integer overflow in tcpnv_acked 2018-01-31 10:26:30 -05:00
tcp_offload.c tcp: Don't coalesce decrypted and encrypted SKBs 2018-07-16 00:12:09 -07:00
tcp_output.c tcp: lack of available data can also cause TSO defer 2018-12-17 09:24:42 +01:00
tcp_rate.c tcp: expose both send and receive intervals for rate sample 2018-07-11 23:01:56 -07:00
tcp_recovery.c tcp: add stat of data packet reordering events 2018-08-01 09:56:10 -07:00
tcp_scalable.c tcp: consolidate congestion control undo functions 2017-08-06 21:25:10 -07:00
tcp_timer.c tcp: change txhash on SYN-data timeout 2019-01-22 21:40:30 +01:00
tcp_ulp.c tcp, ulp: fix leftover icsk_ulp_ops preventing sock from reattach 2018-08-16 14:58:08 -07:00
tcp_vegas.c tcp: fix under-evaluated ssthresh in TCP Vegas 2017-09-29 06:07:00 +01:00
tcp_vegas.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tcp_veno.c tcp: consolidate congestion control undo functions 2017-08-06 21:25:10 -07:00
tcp_westwood.c tcp: Revert "tcp: remove CA_ACK_SLOWPATH" 2017-08-30 11:20:08 -07:00
tcp_yeah.c tcp: consolidate congestion control undo functions 2017-08-06 21:25:10 -07:00
tunnel4.c inet: whitespace cleanup 2018-02-28 11:43:28 -05:00
udp.c udp: with udp_segment release on error path 2019-01-31 08:14:33 +01:00
udp_diag.c udp: fix rx queue len reported by diag and proc interface 2018-06-08 19:55:15 -04:00
udp_impl.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
udp_offload.c Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net 2018-07-03 10:29:26 +09:00
udp_tunnel.c
udplite.c proc: introduce proc_create_net{,_data} 2018-05-16 07:24:30 +02:00
xfrm4_input.c xfrm: reset transport header back to network header after all input transforms ahave been applied 2018-09-04 10:26:30 +02:00
xfrm4_mode_beet.c
xfrm4_mode_transport.c xfrm: reset transport header back to network header after all input transforms ahave been applied 2018-09-04 10:26:30 +02:00
xfrm4_mode_tunnel.c xfrm: Verify MAC header exists before overwriting eth_hdr(skb)->h_proto 2018-03-07 10:54:29 +01:00
xfrm4_output.c net: xfrm: use skb_gso_validate_network_len() to check gso sizes 2018-03-04 17:49:17 -05:00
xfrm4_policy.c xfrm4: Fix uninitialized memory read in _decode_session4 2019-05-25 18:23:41 +02:00
xfrm4_protocol.c
xfrm4_state.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xfrm4_tunnel.c