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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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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>
178 lines
4.7 KiB
C
178 lines
4.7 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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* Definitions for the IP protocol.
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*
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* Version: @(#)ip.h 1.0.2 04/28/93
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*
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* Authors: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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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 _UAPI_LINUX_IP_H
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#define _UAPI_LINUX_IP_H
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#include <linux/types.h>
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#include <asm/byteorder.h>
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#define IPTOS_TOS_MASK 0x1E
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#define IPTOS_TOS(tos) ((tos)&IPTOS_TOS_MASK)
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#define IPTOS_LOWDELAY 0x10
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#define IPTOS_THROUGHPUT 0x08
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#define IPTOS_RELIABILITY 0x04
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#define IPTOS_MINCOST 0x02
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#define IPTOS_PREC_MASK 0xE0
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#define IPTOS_PREC(tos) ((tos)&IPTOS_PREC_MASK)
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#define IPTOS_PREC_NETCONTROL 0xe0
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#define IPTOS_PREC_INTERNETCONTROL 0xc0
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#define IPTOS_PREC_CRITIC_ECP 0xa0
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#define IPTOS_PREC_FLASHOVERRIDE 0x80
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#define IPTOS_PREC_FLASH 0x60
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#define IPTOS_PREC_IMMEDIATE 0x40
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#define IPTOS_PREC_PRIORITY 0x20
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#define IPTOS_PREC_ROUTINE 0x00
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/* IP options */
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#define IPOPT_COPY 0x80
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#define IPOPT_CLASS_MASK 0x60
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#define IPOPT_NUMBER_MASK 0x1f
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#define IPOPT_COPIED(o) ((o)&IPOPT_COPY)
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#define IPOPT_CLASS(o) ((o)&IPOPT_CLASS_MASK)
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#define IPOPT_NUMBER(o) ((o)&IPOPT_NUMBER_MASK)
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#define IPOPT_CONTROL 0x00
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#define IPOPT_RESERVED1 0x20
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#define IPOPT_MEASUREMENT 0x40
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#define IPOPT_RESERVED2 0x60
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#define IPOPT_END (0 |IPOPT_CONTROL)
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#define IPOPT_NOOP (1 |IPOPT_CONTROL)
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#define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY)
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#define IPOPT_LSRR (3 |IPOPT_CONTROL|IPOPT_COPY)
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#define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT)
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#define IPOPT_CIPSO (6 |IPOPT_CONTROL|IPOPT_COPY)
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#define IPOPT_RR (7 |IPOPT_CONTROL)
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#define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY)
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#define IPOPT_SSRR (9 |IPOPT_CONTROL|IPOPT_COPY)
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#define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY)
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#define IPVERSION 4
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#define MAXTTL 255
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#define IPDEFTTL 64
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#define IPOPT_OPTVAL 0
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#define IPOPT_OLEN 1
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#define IPOPT_OFFSET 2
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#define IPOPT_MINOFF 4
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#define MAX_IPOPTLEN 40
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#define IPOPT_NOP IPOPT_NOOP
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#define IPOPT_EOL IPOPT_END
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#define IPOPT_TS IPOPT_TIMESTAMP
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#define IPOPT_TS_TSONLY 0 /* timestamps only */
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#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
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#define IPOPT_TS_PRESPEC 3 /* specified modules only */
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#define IPV4_BEET_PHMAXLEN 8
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struct iphdr {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u8 ihl:4,
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version:4;
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#elif defined (__BIG_ENDIAN_BITFIELD)
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__u8 version:4,
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ihl:4;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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__u8 tos;
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__be16 tot_len;
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__be16 id;
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__be16 frag_off;
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__u8 ttl;
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__u8 protocol;
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__sum16 check;
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__be32 saddr;
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__be32 daddr;
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/*The options start here. */
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};
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struct ip_auth_hdr {
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__u8 nexthdr;
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__u8 hdrlen; /* This one is measured in 32 bit units! */
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__be16 reserved;
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__be32 spi;
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__be32 seq_no; /* Sequence number */
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__u8 auth_data[]; /* Variable len but >=4. Mind the 64 bit alignment! */
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};
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struct ip_esp_hdr {
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__be32 spi;
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__be32 seq_no; /* Sequence number */
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__u8 enc_data[]; /* Variable len but >=8. Mind the 64 bit alignment! */
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};
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struct ip_comp_hdr {
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__u8 nexthdr;
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__u8 flags;
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__be16 cpi;
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};
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struct ip_beet_phdr {
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__u8 nexthdr;
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__u8 hdrlen;
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__u8 padlen;
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__u8 reserved;
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};
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/* index values for the variables in ipv4_devconf */
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enum
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{
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IPV4_DEVCONF_FORWARDING=1,
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IPV4_DEVCONF_MC_FORWARDING,
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IPV4_DEVCONF_PROXY_ARP,
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IPV4_DEVCONF_ACCEPT_REDIRECTS,
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IPV4_DEVCONF_SECURE_REDIRECTS,
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IPV4_DEVCONF_SEND_REDIRECTS,
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IPV4_DEVCONF_SHARED_MEDIA,
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IPV4_DEVCONF_RP_FILTER,
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IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE,
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IPV4_DEVCONF_BOOTP_RELAY,
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IPV4_DEVCONF_LOG_MARTIANS,
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IPV4_DEVCONF_TAG,
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IPV4_DEVCONF_ARPFILTER,
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IPV4_DEVCONF_MEDIUM_ID,
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IPV4_DEVCONF_NOXFRM,
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IPV4_DEVCONF_NOPOLICY,
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IPV4_DEVCONF_FORCE_IGMP_VERSION,
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IPV4_DEVCONF_ARP_ANNOUNCE,
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IPV4_DEVCONF_ARP_IGNORE,
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IPV4_DEVCONF_PROMOTE_SECONDARIES,
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IPV4_DEVCONF_ARP_ACCEPT,
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IPV4_DEVCONF_ARP_NOTIFY,
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IPV4_DEVCONF_ACCEPT_LOCAL,
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IPV4_DEVCONF_SRC_VMARK,
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IPV4_DEVCONF_PROXY_ARP_PVLAN,
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IPV4_DEVCONF_ROUTE_LOCALNET,
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IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL,
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IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL,
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IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN,
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IPV4_DEVCONF_DROP_UNICAST_IN_L2_MULTICAST,
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IPV4_DEVCONF_DROP_GRATUITOUS_ARP,
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IPV4_DEVCONF_BC_FORWARDING,
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IPV4_DEVCONF_ARP_EVICT_NOCARRIER,
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__IPV4_DEVCONF_MAX
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};
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#define IPV4_DEVCONF_MAX (__IPV4_DEVCONF_MAX - 1)
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#endif /* _UAPI_LINUX_IP_H */
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