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linux/net/ipv4
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Eric Dumazet 10e2eb878f udp: fix dst races with multicast early demux 
Multicast dst are not cached. They carry DST_NOCACHE.

As mentioned in commit f8864972126899 ("ipv4: fix dst race in
sk_dst_get()"), these dst need special care before caching them
into a socket.

Caching them is allowed only if their refcnt was not 0, ie we
must use atomic_inc_not_zero()

Also, we must use READ_ONCE() to fetch sk->sk_rx_dst, as mentioned
in commit d0c294c53a771 ("tcp: prevent fetching dst twice in early demux
code")

Fixes: 421b3885bf6d ("udp: ipv4: Add udp early demux")
Tested-by: Gregory Hoggarth <Gregory.Hoggarth@alliedtelesis.co.nz>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Gregory Hoggarth <Gregory.Hoggarth@alliedtelesis.co.nz>
Reported-by: Alex Gartrell <agartrell@fb.com>
Cc: Michal Kubeček <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-08-03 22:16:50 -07:00
..
netfilter
netfilter: arptables: use percpu jumpstack
2015-07-02 17:58:59 +02:00
af_inet.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2015-06-24 02:58:51 -07:00
ah4.c
ipsec: Remove obsolete MAX_AH_AUTH_LEN
2014-09-18 10:54:36 +02:00
arp.c
arp: filter NOARP neighbours for SIOCGARP
2015-07-28 23:41:24 -07:00
cipso_ipv4.c
ipv4: coding style: comparison for inequality with NULL
2015-04-03 12:11:15 -04:00
datagram.c
ipv6: lock socket in ip6_datagram_connect()
2015-07-15 17:25:51 -07:00
devinet.c
net/ipv4: suppress NETDEV_UP notification on address lifetime update
2015-07-28 23:38:13 -07:00
esp4.c
esp4: Switch to new AEAD interface
2015-05-28 11:23:20 +08:00
fib_frontend.c
net: ipv4 sysctl option to ignore routes when nexthop link is down
2015-06-24 02:15:54 -07:00
fib_lookup.h
ipv4: consider TOS in fib_select_default
2015-07-24 22:46:11 -07:00
fib_rules.c
net: ipv4 sysctl option to ignore routes when nexthop link is down
2015-06-24 02:15:54 -07:00
fib_semantics.c
ipv4: consider TOS in fib_select_default
2015-07-24 22:46:11 -07:00
fib_trie.c
fib_trie: Drop unnecessary calls to leaf_pull_suffix
2015-07-27 14:29:11 -07:00
fou.c
fou: avoid missing unlock in failure path
2015-04-16 12:11:19 -04:00
geneve_core.c
geneve_core: identify as driver library in modules description
2015-05-13 15:59:13 -04:00
gre_demux.c
net: Fix GRE RX to use skb_transport_header for GRE header offset
2014-09-08 15:23:05 -07:00
gre_offload.c
ipv4: coding style: comparison for inequality with NULL
2015-04-03 12:11:15 -04:00
icmp.c
ipv4: coding style: comparison for equality with NULL
2015-04-03 12:11:15 -04:00
igmp.c
net: Export IGMP/MLD message validation code
2015-05-04 14:49:23 -04:00
inet_connection_sock.c
tcp: improve REUSEADDR/NOREUSEADDR cohabitation
2015-05-21 18:55:32 -04:00
inet_diag.c
net: inet_diag: always export IPV6_V6ONLY sockopt for listening sockets
2015-07-10 23:25:24 -07:00
inet_fragment.c
inet: frags: remove INET_FRAG_EVICTED and use list_evictor for the test
2015-07-26 21:00:15 -07:00
inet_hashtables.c
tcp: suppress a division by zero warning
2015-07-21 22:13:13 -07:00
inet_lro.c
lro: remove dead code
2013-12-29 16:34:25 -05:00
inet_timewait_sock.c
tcp/dccp: tw_timer_handler() is static
2015-05-13 15:21:33 -04:00
inetpeer.c
inet: remove dead inetpeer sequence code
2014-09-08 16:42:42 -07:00
ip_forward.c
ip: reject too-big defragmented DF-skb when forwarding
2015-05-25 00:08:48 -04:00
ip_fragment.c
inet: frags: remove INET_FRAG_EVICTED and use list_evictor for the test
2015-07-26 21:00:15 -07:00
ip_gre.c
ipv4: coding style: comparison for equality with NULL
2015-04-03 12:11:15 -04:00
ip_input.c
netfilter: Pass socket pointer down through okfn().
2015-04-07 15:25:55 -04:00
ip_options.c
ipv4: coding style: comparison for inequality with NULL
2015-04-03 12:11:15 -04:00
ip_output.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next
2015-06-15 14:30:32 -07:00
ip_sockglue.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2015-06-24 02:58:51 -07:00
ip_tunnel_core.c
ip_tunnel: Report Rx dropped in ip_tunnel_get_stats64
2015-05-14 22:30:54 -04:00
ip_tunnel.c
ip_tunnel: fix ipv4 pmtu check to honor inner ip header df
2015-07-08 16:03:09 -07:00
ip_vti.c
ip_vti/ip6_vti: Preserve skb->mark after rcv_cb call
2015-05-28 06:23:32 +02:00
ipcomp.c
ipv4: coding style: comparison for equality with NULL
2015-04-03 12:11:15 -04:00
ipconfig.c
ipv4: coding style: comparison for equality with NULL
2015-04-03 12:11:15 -04:00
ipip.c
ipip: fix one sparse error
2015-05-17 13:08:29 -04:00
ipmr.c
netfilter: Pass socket pointer down through okfn().
2015-04-07 15:25:55 -04:00
Kconfig
tcp: add CDG congestion control
2015-06-11 00:09:12 -07:00
Makefile
tcp: add CDG congestion control
2015-06-11 00:09:12 -07:00
netfilter.c
netfilter: don't use module_init/exit in core IPV4 code
2015-06-16 14:12:34 -04:00
ping.c
ipv4: Missing sk_nulls_node_init() in ping_unhash().
2015-05-01 22:02:47 -04:00
proc.c
tcp: add TCPWinProbe and TCPKeepAlive SNMP counters
2015-05-09 16:42:32 -04:00
protocol.c
net: Export inet_offloads and inet6_offloads
2014-09-19 17:15:31 -04:00
raw.c
Merge branch 'for-davem' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2015-04-13 18:18:05 -04:00
route.c
ipv4: consider TOS in fib_select_default
2015-07-24 22:46:11 -07:00
syncookies.c
tcp: get_cookie_sock() consolidation
2015-06-07 15:19:52 -07:00
sysctl_net_ipv4.c
net: limit tcp/udp rmem/wmem to SOCK_{RCV,SND}BUF_MIN
2015-05-30 17:37:44 -07:00
tcp_bic.c
tcp: stretch ACK fixes prep
2015-01-28 22:18:37 -08:00
tcp_cdg.c
tcp: cdg: use div_u64()
2015-06-14 12:57:45 -07:00
tcp_cong.c
tcp: fix child sockets to use system default congestion control if not set
2015-05-31 21:49:14 -07:00
tcp_cubic.c
tcp: restore 1.5x per RTT limit to CUBIC cwnd growth in congestion avoidance
2015-03-11 16:51:51 -04:00
tcp_dctcp.c
net: tcp: dctcp_update_alpha() fixes.
2015-06-10 23:28:33 -07:00
tcp_diag.c
sock_diag: implement a get_info handler for inet
2015-06-15 19:49:22 -07:00
tcp_fastopen.c
tcp: Do not call tcp_fastopen_reset_cipher from interrupt context
2015-06-23 02:38:10 -07:00
tcp_highspeed.c
tcp: whitespace fixes
2014-09-01 18:12:45 -07:00
tcp_htcp.c
tcp: whitespace fixes
2014-09-01 18:12:45 -07:00
tcp_hybla.c
tcp: whitespace fixes
2014-09-01 18:12:45 -07:00
tcp_illinois.c
tcp: prepare CC get_info() access from getsockopt()
2015-04-29 17:10:38 -04:00
tcp_input.c
tcp: don't use F-RTO on non-recurring timeouts
2015-07-15 17:17:21 -07:00
tcp_ipv4.c
tcp: remove redundant checks II
2015-06-07 01:55:01 -07:00
tcp_lp.c
tcp: remove in_flight parameter from cong_avoid() methods
2014-05-03 19:23:07 -04:00
tcp_memcontrol.c
memcg: cleanup static keys decrement
2015-02-12 18:54:10 -08:00
tcp_metrics.c
tcp: RFC7413 option support for Fast Open client
2015-04-07 18:36:39 -04:00
tcp_minisocks.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2015-06-01 22:51:30 -07:00
tcp_offload.c
tcp: reserve tcp_skb_mss() to tcp stack
2015-06-11 16:33:10 -07:00
tcp_output.c
tcp: remove obsolete check in tcp_set_skb_tso_segs()
2015-06-11 16:33:11 -07:00
tcp_probe.c
tcp: whitespace fixes
2014-09-01 18:12:45 -07:00
tcp_scalable.c
tcp: stretch ACK fixes prep
2015-01-28 22:18:37 -08:00
tcp_timer.c
tcp: introduce tcp_under_memory_pressure()
2015-05-17 22:45:48 -04:00
tcp_vegas.c
tcp: prepare CC get_info() access from getsockopt()
2015-04-29 17:10:38 -04:00
tcp_vegas.h
tcp: prepare CC get_info() access from getsockopt()
2015-04-29 17:10:38 -04:00
tcp_veno.c
tcp: stretch ACK fixes prep
2015-01-28 22:18:37 -08:00
tcp_westwood.c
tcp_westwood: fix tcp_westwood_info()
2015-05-05 19:50:09 -04:00
tcp_yeah.c
tcp: stretch ACK fixes prep
2015-01-28 22:18:37 -08:00
tcp.c
tcp: fix recv with flags MSG_WAITALL | MSG_PEEK
2015-07-27 01:06:53 -07:00
tunnel4.c
…
udp_diag.c
sock_diag: specify info_size per inet protocol
2015-06-15 19:49:22 -07:00
udp_impl.h
net: Remove iocb argument from sendmsg and recvmsg
2015-03-02 13:06:31 -05:00
udp_offload.c
ipv4: coding style: comparison for inequality with NULL
2015-04-03 12:11:15 -04:00
udp_tunnel.c
net: Modify sk_alloc to not reference count the netns of kernel sockets.
2015-05-11 10:50:18 -04:00
udp.c
udp: fix dst races with multicast early demux
2015-08-03 22:16:50 -07:00
udplite.c
net: Eliminate no_check from protosw
2014-05-23 16:28:53 -04:00
xfrm4_input.c
netfilter: Pass socket pointer down through okfn().
2015-04-07 15:25:55 -04:00
xfrm4_mode_beet.c
ipv4: ERROR: code indent should use tabs where possible
2013-12-26 13:43:21 -05:00
xfrm4_mode_transport.c
…
xfrm4_mode_tunnel.c
ipv4: hash net ptr into fragmentation bucket selection
2015-03-25 14:07:04 -04:00
xfrm4_output.c
netfilter: Pass socket pointer down through okfn().
2015-04-07 15:25:55 -04:00
xfrm4_policy.c
ipv4: coding style: comparison for equality with NULL
2015-04-03 12:11:15 -04:00
xfrm4_protocol.c
xfrm4: Remove duplicate semicolon
2014-06-30 07:49:47 +02:00
xfrm4_state.c
inet: make no_pmtu_disc per namespace and kill ipv4_config
2013-12-18 16:58:20 -05:00
xfrm4_tunnel.c
sit: add IPv4 over IPv4 support
2013-05-31 17:19:05 -07:00