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077130c0cf
linux/include/net
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Eric W. Biederman 077130c0cf [NET]: Fix race when opening a proc file while a network namespace is exiting. 
The problem:  proc_net files remember which network namespace the are
against but do not remember hold a reference count (as that would pin
the network namespace).   So we currently have a small window where
the reference count on a network namespace may be incremented when opening
a /proc file when it has already gone to zero.

To fix this introduce maybe_get_net and get_proc_net.

maybe_get_net increments the network namespace reference count only if it is
greater then zero, ensuring we don't increment a reference count after it
has gone to zero.

get_proc_net handles all of the magic to go from a proc inode to the network
namespace instance and call maybe_get_net on it.

PROC_NET the old accessor is removed so that we don't get confused and use
the wrong helper function.

Then I fix up the callers to use get_proc_net and handle the case case
where get_proc_net returns NULL.  In that case I return -ENXIO because
effectively the network namespace has already gone away so the files
we are trying to access don't exist anymore.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Paul E. McKenney <paulmck@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-10 16:49:22 -07:00
..
9p 9p: Reorganization of 9p file system code 2007-07-14 15:13:40 -05:00
bluetooth [BLUETOOTH] l2cap: endianness annotations 2007-07-31 02:28:07 -07:00
irda [IrDA]: Netlink layer. 2007-07-10 22:16:43 -07:00
iucv [NET]: Make socket creation namespace safe. 2007-10-10 16:49:07 -07:00
netfilter [NETFILTER]: nf_nat: add symbolic dependency on IPv4 conntrack 2007-08-07 18:12:01 -07:00
sctp [SCTP]: Make sctp_addto_param() static. 2007-10-10 16:49:19 -07:00
tc_act
tipc [TIPC]: Optimize stream send routine to avoid fragmentation 2007-07-10 22:06:12 -07:00
act_api.h [NET_SCHED]: Kill CONFIG_NET_CLS_POLICE 2007-07-15 00:03:05 -07:00
addrconf.h [IPV6] MIP6: Loadable module support for MIPv6. 2007-07-10 22:15:42 -07:00
af_rxrpc.h [AF_RXRPC]: Add an interface to the AF_RXRPC module for the AFS filesystem to use 2007-04-26 15:50:17 -07:00
af_unix.h [AF_UNIX]: Make code static. 2007-07-31 02:28:27 -07:00
ah.h
arp.h
atmclip.h
ax25.h [SK_BUFF]: Introduce skb_reset_mac_header(skb) 2007-04-25 22:24:32 -07:00
ax88796.h AX88796 network driver 2007-07-10 12:41:08 -04:00
cfg80211.h [PATCH] cfg80211: Radiotap parser 2007-07-12 16:07:24 -04:00
checksum.h
cipso_ipv4.h [NetLabel]: consolidate the struct socket/sock handling to just struct sock 2007-06-08 13:33:09 -07:00
compat.h [NET]: Introduce SIOCGSTAMPNS ioctl to get timestamps with nanosec resolution 2007-04-25 22:24:04 -07:00
datalink.h
dn_dev.h
dn_fib.h [DECNet]: Use rtnl registration interface 2007-04-25 22:27:12 -07:00
dn_neigh.h
dn_nsp.h
dn_route.h [DECNet]: Use rtnl registration interface 2007-04-25 22:27:12 -07:00
dn.h [DECNET]: Another unnecessary net/tcp.h inclusion in net/dn.h 2007-07-10 23:02:12 -07:00
dsfield.h
dst.h [IPV4]: The scheduled removal of multipath cached routing support. 2007-07-10 22:05:57 -07:00
esp.h [NET]: Move generic skbuff stuff from XFRM code to generic code 2007-04-25 22:28:33 -07:00
fib_rules.h [NETLINK]: Mark netlink policies const 2007-06-07 13:40:10 -07:00
flow.h [IPV6] MIP6: Kill unnecessary ifdefs. 2007-07-10 22:15:41 -07:00
gen_stats.h
genetlink.h [GENETLINK]: Dynamic multicast groups. 2007-07-18 15:47:52 -07:00
icmp.h
ieee80211_crypt.h [PATCH] Update my email address from jkmaline@cc.hut.fi to j@w1.fi 2007-04-28 11:01:01 -04:00
ieee80211_radiotap.h [MAC80211]: Add get_unaligned to ieee80211_get_radiotap_len 2007-10-10 16:47:40 -07:00
ieee80211.h [PATCH] ieee80211: add ieee80211_channel_to_freq 2007-05-08 11:51:59 -04:00
ieee80211softmac_wx.h
ieee80211softmac.h
if_inet6.h
inet6_connection_sock.h
inet6_hashtables.h [INET]: Use jhash + random secret for ehash. 2007-04-25 22:28:06 -07:00
inet_common.h
inet_connection_sock.h
inet_ecn.h [SK_BUFF]: Convert skb->tail to sk_buff_data_t 2007-04-25 22:26:28 -07:00
inet_hashtables.h
inet_sock.h [INET]: Use jhash + random secret for ehash. 2007-04-25 22:28:06 -07:00
inet_timewait_sock.h [NET]: Add a network namespace parameter to struct sock 2007-10-10 16:49:05 -07:00
inetpeer.h
ip6_checksum.h
ip6_fib.h [IPV6] XFRM: Fix connected socket to use transformation. 2007-10-10 16:48:32 -07:00
ip6_route.h [IPv6]: Use rtnl registration interface 2007-04-25 22:27:13 -07:00
ip6_tunnel.h
ip_fib.h [IPV4]: The scheduled removal of multipath cached routing support. 2007-07-10 22:05:57 -07:00
ip_vs.h
ip.h [TCP]: Honour sk_bound_dev_if in tcp_v4_send_ack 2007-06-07 13:38:51 -07:00
ipcomp.h
ipconfig.h
ipip.h
ipv6.h [IPV6]: Add v4mapped address inline 2007-10-10 16:48:32 -07:00
ipx.h [SK_BUFF]: Introduce skb_transport_header(skb) 2007-04-25 22:25:31 -07:00
iw_handler.h [WEXT]: Clean up how wext is called. 2007-04-26 20:43:56 -07:00
lapb.h
llc_c_ac.h
llc_c_ev.h
llc_c_st.h
llc_conn.h [NET]: Make socket creation namespace safe. 2007-10-10 16:49:07 -07:00
llc_if.h
llc_pdu.h [SK_BUFF]: Introduce skb_network_header() 2007-04-25 22:24:59 -07:00
llc_s_ac.h
llc_s_ev.h
llc_s_st.h
llc_sap.h
llc.h
mac80211.h [MAC80211]: rework key handling 2007-10-10 16:48:53 -07:00
mip6.h [IPV6] MIP6: Loadable module support for MIPv6. 2007-07-10 22:15:42 -07:00
ndisc.h
neighbour.h [NEIGH]: Use rtnl registration interface 2007-04-25 22:27:06 -07:00
net_namespace.h [NET]: Fix race when opening a proc file while a network namespace is exiting. 2007-10-10 16:49:22 -07:00
netdma.h
netevent.h
netlabel.h SELinux: restore proper NetLabel caching behavior 2007-08-02 11:52:21 -04:00
netlink.h [NETLINK]: Introduce nested and byteorder flag to netlink attribute 2007-10-10 16:49:16 -07:00
netrom.h
nexthop.h
p8022.h
pkt_cls.h [NET]: Make the device list and device lookups per namespace. 2007-10-10 16:49:10 -07:00
pkt_sched.h [NET_SCHED]: act_api: qdisc internal reclassify support 2007-07-15 00:02:31 -07:00
protocol.h
psnap.h [NET]: Kill skb->real_dev 2005-08-29 15:32:25 -07:00
raw.h
rawv6.h [IPV6] MIP6: Loadable module support for MIPv6. 2007-07-10 22:15:42 -07:00
red.h [NET_SCHED]: turn PSCHED_GET_TIME into inline function 2007-04-25 22:27:55 -07:00
request_sock.h
rose.h [ROSE]: Fix rose.ko oops on unload 2007-10-07 23:44:17 -07:00
route.h [IPV4]: Make ip_tos2prio const. 2007-07-10 22:19:04 -07:00
rtnetlink.h [NET]: Make the device list and device lookups per namespace. 2007-10-10 16:49:10 -07:00
sch_generic.h [NET_SCHED]: Making rate table lookups more flexible. 2007-10-10 16:49:20 -07:00
scm.h avoid OPEN_MAX in SCM_MAX_FD 2007-07-17 10:23:03 -07:00
slhc_vj.h
snmp.h
sock.h [NET]: Make socket creation namespace safe. 2007-10-10 16:49:07 -07:00
syncppp.h
tcp_states.h
tcp.h [TCP]: tcp_packets_out_inc to tcp_output.c (no callers elsewhere) 2007-10-10 16:48:28 -07:00
timewait_sock.h
transp_v6.h
udp.h [UDP]: Revert 2-pass hashing changes. 2007-06-07 13:40:50 -07:00
udplite.h [UDP]: Revert 2-pass hashing changes. 2007-06-07 13:40:50 -07:00
veth.h [NET]: Virtual ethernet device driver. 2007-10-10 16:47:46 -07:00
wext.h [NET]: Make the device list and device lookups per namespace. 2007-10-10 16:49:10 -07:00
wireless.h [WIRELESS] cfg80211: New wireless config infrastructure. 2007-04-25 22:29:41 -07:00
x25.h
x25device.h [SK_BUFF]: Introduce skb_reset_mac_header(skb) 2007-04-25 22:24:32 -07:00
xfrm.h [XFRM]: xfrm audit calls 2007-10-10 16:49:02 -07:00