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94dfc73e7c
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:
(linux-5.19-rc2$ 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
];
};
-fstrict-flex-arrays=3 is coming and we need to land these changes
to prevent issues like these in the short future:
../fs/minix/dir.c:337:3: warning: 'strcpy' will always overflow; destination buffer has size 0,
but the source string has length 2 (including NUL byte) [-Wfortify-source]
strcpy(de3->name, ".");
^
Since these are all [0] to [] changes, the risk to UAPI is nearly zero. If
this breaks anything, we can use a union with a new member name.
[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
Build-tested-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/lkml/62b675ec.wKX6AOZ6cbE71vtF%25lkp@intel.com/
Acked-by: Dan Williams <dan.j.williams@intel.com> # For ndctl.h
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
131 lines
3.6 KiB
C
131 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Global definitions for the ARCnet interface.
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*
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* Authors: David Woodhouse and Avery Pennarun
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _LINUX_IF_ARCNET_H
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#define _LINUX_IF_ARCNET_H
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#include <linux/types.h>
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#include <linux/if_ether.h>
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/*
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* These are the defined ARCnet Protocol ID's.
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*/
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/* CAP mode */
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/* No macro but uses 1-8 */
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/* RFC1201 Protocol ID's */
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#define ARC_P_IP 212 /* 0xD4 */
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#define ARC_P_IPV6 196 /* 0xC4: RFC2497 */
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#define ARC_P_ARP 213 /* 0xD5 */
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#define ARC_P_RARP 214 /* 0xD6 */
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#define ARC_P_IPX 250 /* 0xFA */
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#define ARC_P_NOVELL_EC 236 /* 0xEC */
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/* Old RFC1051 Protocol ID's */
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#define ARC_P_IP_RFC1051 240 /* 0xF0 */
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#define ARC_P_ARP_RFC1051 241 /* 0xF1 */
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/* MS LanMan/WfWg "NDIS" encapsulation */
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#define ARC_P_ETHER 232 /* 0xE8 */
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/* Unsupported/indirectly supported protocols */
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#define ARC_P_DATAPOINT_BOOT 0 /* very old Datapoint equipment */
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#define ARC_P_DATAPOINT_MOUNT 1
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#define ARC_P_POWERLAN_BEACON 8 /* Probably ATA-Netbios related */
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#define ARC_P_POWERLAN_BEACON2 243 /* 0xF3 */
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#define ARC_P_LANSOFT 251 /* 0xFB - what is this? */
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#define ARC_P_ATALK 0xDD
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/* Hardware address length */
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#define ARCNET_ALEN 1
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/*
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* The RFC1201-specific components of an arcnet packet header.
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*/
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struct arc_rfc1201 {
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__u8 proto; /* protocol ID field - varies */
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__u8 split_flag; /* for use with split packets */
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__be16 sequence; /* sequence number */
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__u8 payload[]; /* space remaining in packet (504 bytes)*/
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};
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#define RFC1201_HDR_SIZE 4
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/*
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* The RFC1051-specific components.
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*/
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struct arc_rfc1051 {
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__u8 proto; /* ARC_P_RFC1051_ARP/RFC1051_IP */
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__u8 payload[]; /* 507 bytes */
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};
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#define RFC1051_HDR_SIZE 1
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/*
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* The ethernet-encap-specific components. We have a real ethernet header
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* and some data.
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*/
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struct arc_eth_encap {
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__u8 proto; /* Always ARC_P_ETHER */
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struct ethhdr eth; /* standard ethernet header (yuck!) */
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__u8 payload[]; /* 493 bytes */
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};
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#define ETH_ENCAP_HDR_SIZE 14
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struct arc_cap {
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__u8 proto;
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__u8 cookie[sizeof(int)];
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/* Actually NOT sent over the network */
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union {
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__u8 ack;
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__u8 raw[0]; /* 507 bytes */
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} mes;
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};
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/*
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* The data needed by the actual arcnet hardware.
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*
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* Now, in the real arcnet hardware, the third and fourth bytes are the
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* 'offset' specification instead of the length, and the soft data is at
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* the _end_ of the 512-byte buffer. We hide this complexity inside the
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* driver.
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*/
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struct arc_hardware {
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__u8 source; /* source ARCnet - filled in automagically */
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__u8 dest; /* destination ARCnet - 0 for broadcast */
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__u8 offset[2]; /* offset bytes (some weird semantics) */
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};
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#define ARC_HDR_SIZE 4
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/*
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* This is an ARCnet frame header, as seen by the kernel (and userspace,
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* when you do a raw packet capture).
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*/
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struct archdr {
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/* hardware requirements */
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struct arc_hardware hard;
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/* arcnet encapsulation-specific bits */
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union {
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struct arc_rfc1201 rfc1201;
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struct arc_rfc1051 rfc1051;
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struct arc_eth_encap eth_encap;
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struct arc_cap cap;
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__u8 raw[0]; /* 508 bytes */
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} soft;
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};
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#endif /* _LINUX_IF_ARCNET_H */
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