From: Nicolas Dichtel <nicolas.dichtel@6wind.com>
To: netdev@vger.kernel.org
Cc: davem@davemloft.net, ebiederm@xmission.com,
Nicolas Dichtel <nicolas.dichtel@6wind.com>
Subject: [PATCH net-next 6/6] netlink: allow to listen "all" netns
Date: Wed, 6 May 2015 11:58:08 +0200 [thread overview]
Message-ID: <1430906288-5108-7-git-send-email-nicolas.dichtel@6wind.com> (raw)
In-Reply-To: <1430906288-5108-1-git-send-email-nicolas.dichtel@6wind.com>
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.
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
---
include/linux/netlink.h | 1 +
include/net/net_namespace.h | 2 ++
include/uapi/linux/netlink.h | 1 +
net/core/net_namespace.c | 10 +++++++++-
net/netlink/af_netlink.c | 39 +++++++++++++++++++++++++++++++++++++--
5 files changed, 50 insertions(+), 3 deletions(-)
diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 6835c1279df7..2e34392ddfb7 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -28,6 +28,7 @@ struct netlink_skb_parms {
__u32 dst_group;
__u32 flags;
struct sock *sk;
+ struct net *net;
};
#define NETLINK_CB(skb) (*(struct netlink_skb_parms*)&((skb)->cb))
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 6d1e2eae32fb..3f850acc844e 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -272,6 +272,8 @@ static inline struct net *read_pnet(const possible_net_t *pnet)
#endif
int peernet2id_alloc(struct net *net, struct net *peer);
+int peernet2id(struct net *net, struct net *peer);
+bool peernet_has_id(struct net *net, struct net *peer);
struct net *get_net_ns_by_id(struct net *net, int id);
struct pernet_operations {
diff --git a/include/uapi/linux/netlink.h b/include/uapi/linux/netlink.h
index 1a85940f8ab7..3e34b7d702f8 100644
--- a/include/uapi/linux/netlink.h
+++ b/include/uapi/linux/netlink.h
@@ -108,6 +108,7 @@ struct nlmsgerr {
#define NETLINK_NO_ENOBUFS 5
#define NETLINK_RX_RING 6
#define NETLINK_TX_RING 7
+#define NETLINK_LISTEN_ALL_NSID 8
struct nl_pktinfo {
__u32 group;
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 0b4cb3d63449..2af3cc4ecf2d 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -221,7 +221,7 @@ int peernet2id_alloc(struct net *net, struct net *peer)
EXPORT_SYMBOL(peernet2id_alloc);
/* This function returns, if assigned, the id of a peer netns. */
-static int peernet2id(struct net *net, struct net *peer)
+int peernet2id(struct net *net, struct net *peer)
{
unsigned long flags;
bool no = false;
@@ -233,6 +233,14 @@ static int peernet2id(struct net *net, struct net *peer)
return id;
}
+/* This function returns true is the peer netns has an id assigned into the
+ * current netns.
+ */
+bool peernet_has_id(struct net *net, struct net *peer)
+{
+ return peernet2id(net, peer) >= 0;
+}
+
struct net *get_net_ns_by_id(struct net *net, int id)
{
unsigned long flags;
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index ec4adbdcb9b4..bdbde542e952 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -83,6 +83,7 @@ struct listeners {
#define NETLINK_RECV_PKTINFO 0x2
#define NETLINK_BROADCAST_SEND_ERROR 0x4
#define NETLINK_RECV_NO_ENOBUFS 0x8
+#define NETLINK_LISTEN_ALL 0x10
static inline int netlink_is_kernel(struct sock *sk)
{
@@ -1931,8 +1932,18 @@ static void do_one_broadcast(struct sock *sk,
!test_bit(p->group - 1, nlk->groups))
return;
- if (!net_eq(sock_net(sk), p->net))
- return;
+ if (!net_eq(sock_net(sk), p->net)) {
+ if (!(nlk->flags & NETLINK_LISTEN_ALL))
+ return;
+
+ if (!peernet_has_id(sock_net(sk), p->net))
+ return;
+
+ if (!file_ns_capable(sk->sk_socket->file, p->net->user_ns,
+ CAP_NET_BROADCAST))
+ return;
+ }
+ NETLINK_CB(p->skb).net = p->net;
if (p->failure) {
netlink_overrun(sk);
@@ -2201,6 +2212,16 @@ static int netlink_setsockopt(struct socket *sock, int level, int optname,
break;
}
#endif /* CONFIG_NETLINK_MMAP */
+ case NETLINK_LISTEN_ALL_NSID:
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_BROADCAST))
+ return -EPERM;
+
+ if (val)
+ nlk->flags |= NETLINK_LISTEN_ALL;
+ else
+ nlk->flags &= ~NETLINK_LISTEN_ALL;
+ err = 0;
+ break;
default:
err = -ENOPROTOOPT;
}
@@ -2267,6 +2288,18 @@ static void netlink_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
put_cmsg(msg, SOL_NETLINK, NETLINK_PKTINFO, sizeof(info), &info);
}
+static void netlink_cmsg_listen_all_nsid(struct sock *sk, struct msghdr *msg,
+ struct sk_buff *skb)
+{
+ int nsid;
+
+ if (!NETLINK_CB(skb).net)
+ return;
+
+ nsid = peernet2id(sock_net(sk), NETLINK_CB(skb).net);
+ put_cmsg(msg, SOL_NETLINK, NETLINK_LISTEN_ALL_NSID, sizeof(int), &nsid);
+}
+
static int netlink_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
{
struct sock *sk = sock->sk;
@@ -2420,6 +2453,8 @@ static int netlink_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
if (nlk->flags & NETLINK_RECV_PKTINFO)
netlink_cmsg_recv_pktinfo(msg, skb);
+ if (nlk->flags & NETLINK_LISTEN_ALL)
+ netlink_cmsg_listen_all_nsid(sk, msg, skb);
memset(&scm, 0, sizeof(scm));
scm.creds = *NETLINK_CREDS(skb);
--
2.2.2
next prev parent reply other threads:[~2015-05-06 9:58 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-06 9:58 [PATCH net-next 0/6] netns: ease netlink use with a lot of netns Nicolas Dichtel
2015-05-06 9:58 ` [PATCH net-next 1/6] netns: returns always an id in __peernet2id() Nicolas Dichtel
2015-05-06 11:19 ` Thomas Graf
2015-05-06 9:58 ` [PATCH net-next 2/6] netns: always provide the id to rtnl_net_fill() Nicolas Dichtel
2015-05-06 11:25 ` Thomas Graf
2015-05-06 9:58 ` [PATCH net-next 3/6] netns: rename peernet2id() to peernet2id_alloc() Nicolas Dichtel
2015-05-06 11:27 ` Thomas Graf
2015-05-06 9:58 ` [PATCH net-next 4/6] netns: notify new nsid outside __peernet2id() Nicolas Dichtel
2015-05-06 11:48 ` Thomas Graf
2015-05-06 13:39 ` Nicolas Dichtel
2015-05-06 9:58 ` [PATCH net-next 5/6] netns: use a spin_lock to protect nsid management Nicolas Dichtel
2015-05-06 12:23 ` Thomas Graf
2015-05-06 13:40 ` Nicolas Dichtel
2015-05-06 14:05 ` Thomas Graf
2015-05-06 9:58 ` Nicolas Dichtel [this message]
2015-05-06 12:10 ` [PATCH net-next 6/6] netlink: allow to listen "all" netns Thomas Graf
2015-05-06 13:42 ` Nicolas Dichtel
2015-05-07 9:02 ` [PATCH net-next v2 0/7] netns: ease netlink use with a lot of netns Nicolas Dichtel
2015-05-07 9:02 ` [PATCH net-next v2 1/7] netns: returns always an id in __peernet2id() Nicolas Dichtel
2015-05-07 9:02 ` [PATCH net-next v2 2/7] netns: always provide the id to rtnl_net_fill() Nicolas Dichtel
2015-05-07 9:02 ` [PATCH net-next v2 3/7] netns: rename peernet2id() to peernet2id_alloc() Nicolas Dichtel
2015-05-07 9:02 ` [PATCH net-next v2 4/7] netns: notify new nsid outside __peernet2id() Nicolas Dichtel
2015-05-07 11:47 ` Thomas Graf
2015-05-07 9:02 ` [PATCH net-next v2 5/7] netns: use a spin_lock to protect nsid management Nicolas Dichtel
2015-05-07 9:02 ` [PATCH net-next v2 6/7] netlink: rename private flags and states Nicolas Dichtel
2015-05-07 11:49 ` Thomas Graf
2015-05-07 9:02 ` [PATCH net-next v2 7/7] netlink: allow to listen "all" netns Nicolas Dichtel
2015-05-07 11:55 ` Thomas Graf
2015-05-08 12:02 ` [PATCH net-next v2 0/7] netns: ease netlink use with a lot of netns Eric W. Biederman
2015-05-09 21:07 ` Nicolas Dichtel
2015-05-22 20:50 ` Alexander Holler
2015-05-22 21:04 ` Cong Wang
2015-05-22 21:12 ` Alexander Holler
2015-05-22 21:29 ` Cong Wang
2015-05-22 21:46 ` Alexander Holler
2015-05-22 21:19 ` Eric W. Biederman
2015-05-22 21:30 ` Alexander Holler
2015-05-25 7:45 ` Nicolas Dichtel
2015-05-25 10:55 ` Alexander Holler
2015-05-25 13:09 ` Nicolas Dichtel
2015-05-26 10:53 ` Alexander Holler
2015-05-26 12:10 ` Nicolas Dichtel
2015-05-26 14:36 ` Alexander Holler
2015-05-29 5:57 ` Alexander Holler
2015-05-10 2:15 ` David Miller
2015-05-20 14:19 ` [PATCH iproute2-next 0/6] Allow to monitor 'all-nsid' with ip and ip xfrm Nicolas Dichtel
2015-05-20 14:19 ` [PATCH iproute2-next 1/6] include: update linux/netlink.h Nicolas Dichtel
2015-05-20 14:19 ` [PATCH iproute2-next 2/6] man: update ip monitor page Nicolas Dichtel
2015-05-20 14:19 ` [PATCH iproute2-next 3/6] libnetlink: introduce rtnl_listen_filter_t Nicolas Dichtel
2015-05-20 14:19 ` [PATCH iproute2-next 4/6] ipmonitor: introduce print_headers Nicolas Dichtel
2015-05-20 14:20 ` [PATCH iproute2-next 5/6] ipmonitor: allows to monitor in several netns Nicolas Dichtel
2015-05-20 14:20 ` [PATCH iproute2-next 6/6] xfrmmonitor: " Nicolas Dichtel
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