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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /include/net/netns/generic.h
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'include/net/netns/generic.h')
-rw-r--r--include/net/netns/generic.h52
1 files changed, 52 insertions, 0 deletions
diff --git a/include/net/netns/generic.h b/include/net/netns/generic.h
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+++ b/include/net/netns/generic.h
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+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * generic net pointers
+ */
+
+#ifndef __NET_GENERIC_H__
+#define __NET_GENERIC_H__
+
+#include <linux/bug.h>
+#include <linux/rcupdate.h>
+#include <net/net_namespace.h>
+
+/*
+ * Generic net pointers are to be used by modules to put some private
+ * stuff on the struct net without explicit struct net modification
+ *
+ * The rules are simple:
+ * 1. set pernet_operations->id. After register_pernet_device you
+ * will have the id of your private pointer.
+ * 2. set pernet_operations->size to have the code allocate and free
+ * a private structure pointed to from struct net.
+ * 3. do not change this pointer while the net is alive;
+ * 4. do not try to have any private reference on the net_generic object.
+ *
+ * After accomplishing all of the above, the private pointer can be
+ * accessed with the net_generic() call.
+ */
+
+struct net_generic {
+ union {
+ struct {
+ unsigned int len;
+ struct rcu_head rcu;
+ } s;
+
+ DECLARE_FLEX_ARRAY(void *, ptr);
+ };
+};
+
+static inline void *net_generic(const struct net *net, unsigned int id)
+{
+ struct net_generic *ng;
+ void *ptr;
+
+ rcu_read_lock();
+ ng = rcu_dereference(net->gen);
+ ptr = ng->ptr[id];
+ rcu_read_unlock();
+
+ return ptr;
+}
+#endif