linux/include/net/ioam6.h
Gustavo A. R. Silva 5224f79096 treewide: Replace zero-length arrays with flexible-array members
There is a regular need in the kernel to provide a way to declare
having a dynamically sized set of trailing elements in a structure.
Kernel code should always use “flexible array members”[1] for these
cases. The older style of one-element or zero-length arrays should
no longer be used[2].

This code was transformed with the help of Coccinelle:
(next-20220214$ spatch --jobs $(getconf _NPROCESSORS_ONLN) --sp-file script.cocci --include-headers --dir . > output.patch)

@@
identifier S, member, array;
type T1, T2;
@@

struct S {
  ...
  T1 member;
  T2 array[
- 0
  ];
};

UAPI and wireless changes were intentionally excluded from this patch
and will be sent out separately.

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays

Link: https://github.com/KSPP/linux/issues/78
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2022-02-17 07:00:39 -06:00

69 lines
1.2 KiB
C

/* SPDX-License-Identifier: GPL-2.0+ */
/*
* IPv6 IOAM implementation
*
* Author:
* Justin Iurman <justin.iurman@uliege.be>
*/
#ifndef _NET_IOAM6_H
#define _NET_IOAM6_H
#include <linux/net.h>
#include <linux/ipv6.h>
#include <linux/ioam6.h>
#include <linux/rhashtable-types.h>
struct ioam6_namespace {
struct rhash_head head;
struct rcu_head rcu;
struct ioam6_schema __rcu *schema;
__be16 id;
__be32 data;
__be64 data_wide;
};
struct ioam6_schema {
struct rhash_head head;
struct rcu_head rcu;
struct ioam6_namespace __rcu *ns;
u32 id;
int len;
__be32 hdr;
u8 data[];
};
struct ioam6_pernet_data {
struct mutex lock;
struct rhashtable namespaces;
struct rhashtable schemas;
};
static inline struct ioam6_pernet_data *ioam6_pernet(struct net *net)
{
#if IS_ENABLED(CONFIG_IPV6)
return net->ipv6.ioam6_data;
#else
return NULL;
#endif
}
struct ioam6_namespace *ioam6_namespace(struct net *net, __be16 id);
void ioam6_fill_trace_data(struct sk_buff *skb,
struct ioam6_namespace *ns,
struct ioam6_trace_hdr *trace,
bool is_input);
int ioam6_init(void);
void ioam6_exit(void);
int ioam6_iptunnel_init(void);
void ioam6_iptunnel_exit(void);
#endif /* _NET_IOAM6_H */