kernel/linux.git/include/net/net_namespace.h, branch v4.9.162

netfilter: ipv6: nf_defrag: reduce struct net memory waste

2018-08-24T11:12:26+00:00

[ Upstream commit 9ce7bc036ae4cfe3393232c86e9e1fea2153c237 ] It is a waste of memory to use a full "struct netns_sysctl_ipv6" while only one pointer is really used, considering netns_sysctl_ipv6 keeps growing. Also, since "struct netns_frags" has cache line alignment, it is better to move the frags_hdr pointer outside, otherwise we spend a full cache line for this pointer. This saves 192 bytes of memory per netns. Fixes: c038a767cd69 ("ipv6: add a new namespace for nf_conntrack_reasm") Signed-off-by: Eric Dumazet Signed-off-by: Pablo Neira Ayuso Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

net: tcp: close sock if net namespace is exiting

2018-01-31T11:55:54+00:00

[ Upstream commit 4ee806d51176ba7b8ff1efd81f271d7252e03a1d ] When a tcp socket is closed, if it detects that its net namespace is exiting, close immediately and do not wait for FIN sequence. For normal sockets, a reference is taken to their net namespace, so it will never exit while the socket is open. However, kernel sockets do not take a reference to their net namespace, so it may begin exiting while the kernel socket is still open. In this case if the kernel socket is a tcp socket, it will stay open trying to complete its close sequence. The sock's dst(s) hold a reference to their interface, which are all transferred to the namespace's loopback interface when the real interfaces are taken down. When the namespace tries to take down its loopback interface, it hangs waiting for all references to the loopback interface to release, which results in messages like: unregister_netdevice: waiting for lo to become free. Usage count = 1 These messages continue until the socket finally times out and closes. Since the net namespace cleanup holds the net_mutex while calling its registered pernet callbacks, any new net namespace initialization is blocked until the current net namespace finishes exiting. After this change, the tcp socket notices the exiting net namespace, and closes immediately, releasing its dst(s) and their reference to the loopback interface, which lets the net namespace continue exiting. Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1711407 Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=97811 Signed-off-by: Dan Streetman Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman

netns: fix get_net_ns_by_fd(int pid) typo

2016-11-18T19:01:58+00:00

The argument to get_net_ns_by_fd() is a /proc/$PID/ns/net file descriptor not a pid. Fix the typo. Signed-off-by: Stefan Hajnoczi Acked-by: Rami Rosen Signed-off-by: David S. Miller

netns: Add a limit on the number of net namespaces

2016-08-08T19:42:04+00:00

Acked-by: Kees Cook Signed-off-by: "Eric W. Biederman"

treewide: replace obsolete _refok by __ref

2016-08-02T21:31:41+00:00

There was only one use of __initdata_refok and __exit_refok __init_refok was used 46 times against 82 for __ref. Those definitions are obsolete since commit 312b1485fb50 ("Introduce new section reference annotations tags: __ref, __refdata, __refconst") This patch removes the following compatibility definitions and replaces them treewide. /* compatibility defines */ #define __init_refok __ref #define __initdata_refok __refdata #define __exit_refok __ref I can also provide separate patches if necessary. (One patch per tree and check in 1 month or 2 to remove old definitions) [akpm@linux-foundation.org: coding-style fixes] Link: http://lkml.kernel.org/r/1466796271-3043-1-git-send-email-fabf@skynet.be Signed-off-by: Fabian Frederick Cc: Ingo Molnar Cc: Sam Ravnborg Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

netfilter: cttimeout: add netns support

2015-12-14T11:48:58+00:00

Add a per-netns list of timeout objects and adjust code to use it. Signed-off-by: Pablo Neira Ayuso

netfilter: nfacct: per network namespace support

2015-08-07T09:50:56+00:00

- Move the nfnl_acct_list into the network namespace, initialize and destroy it per namespace - Keep track of refcnt on nfacct objects, the old logic does not longer work with a per namespace list - Adjust xt_nfacct to pass the namespace when registring objects Signed-off-by: Andreas Schultz Signed-off-by: Pablo Neira Ayuso

net: include missing headers in net/net_namespace.h

2015-06-18T19:14:29+00:00

Include linux/idr.h and linux/skbuff.h since they are required by objects that are declared in the net structure. struct net { ... struct idr netns_ids; ... struct sk_buff_head wext_nlevents; ... Signed-off-by: Pablo Neira Ayuso Signed-off-by: Eric W. Biederman

netns: make nsid_lock per net

2015-05-18T03:41:11+00:00

The spinlock is used to protect netns_ids which is per net, so there is no need to use a global spinlock. Cc: Nicolas Dichtel Signed-off-by: Cong Wang Acked-by: Nicolas Dichtel Signed-off-by: David S. Miller

netlink: allow to listen "all" netns

2015-05-10T02:15:31+00:00

More accurately, listen all netns that have a nsid assigned into the netns where the netlink socket is opened. For this purpose, a netlink socket option is added: NETLINK_LISTEN_ALL_NSID. When this option is set on a netlink socket, this socket will receive netlink notifications from all netns that have a nsid assigned into the netns where the socket has been opened. The nsid is sent to userland via an anscillary data. With this patch, a daemon needs only one socket to listen many netns. This is useful when the number of netns is high. Because 0 is a valid value for a nsid, the field nsid_is_set indicates if the field nsid is valid or not. skb->cb is initialized to 0 on skb allocation, thus we are sure that we will never send a nsid 0 by error to the userland. Signed-off-by: Nicolas Dichtel Acked-by: Thomas Graf Signed-off-by: David S. Miller