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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>
130 lines
3 KiB
C
130 lines
3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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/*
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* Linux NET3: Internet Group Management Protocol [IGMP]
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*
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* Authors:
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* Alan Cox <alan@lxorguk.ukuu.org.uk>
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*
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* Extended to talk the BSD extended IGMP protocol of mrouted 3.6
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*
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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_IGMP_H
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#define _UAPI_LINUX_IGMP_H
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#include <linux/types.h>
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#include <asm/byteorder.h>
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/*
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* IGMP protocol structures
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*/
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/*
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* Header in on cable format
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*/
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struct igmphdr {
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__u8 type;
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__u8 code; /* For newer IGMP */
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__sum16 csum;
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__be32 group;
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};
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/* V3 group record types [grec_type] */
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#define IGMPV3_MODE_IS_INCLUDE 1
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#define IGMPV3_MODE_IS_EXCLUDE 2
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#define IGMPV3_CHANGE_TO_INCLUDE 3
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#define IGMPV3_CHANGE_TO_EXCLUDE 4
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#define IGMPV3_ALLOW_NEW_SOURCES 5
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#define IGMPV3_BLOCK_OLD_SOURCES 6
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struct igmpv3_grec {
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__u8 grec_type;
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__u8 grec_auxwords;
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__be16 grec_nsrcs;
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__be32 grec_mca;
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__be32 grec_src[];
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};
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struct igmpv3_report {
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__u8 type;
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__u8 resv1;
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__sum16 csum;
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__be16 resv2;
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__be16 ngrec;
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struct igmpv3_grec grec[];
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};
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struct igmpv3_query {
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__u8 type;
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__u8 code;
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__sum16 csum;
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__be32 group;
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u8 qrv:3,
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suppress:1,
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resv:4;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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__u8 resv:4,
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suppress:1,
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qrv:3;
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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 qqic;
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__be16 nsrcs;
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__be32 srcs[];
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};
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#define IGMP_HOST_MEMBERSHIP_QUERY 0x11 /* From RFC1112 */
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#define IGMP_HOST_MEMBERSHIP_REPORT 0x12 /* Ditto */
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#define IGMP_DVMRP 0x13 /* DVMRP routing */
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#define IGMP_PIM 0x14 /* PIM routing */
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#define IGMP_TRACE 0x15
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#define IGMPV2_HOST_MEMBERSHIP_REPORT 0x16 /* V2 version of 0x12 */
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#define IGMP_HOST_LEAVE_MESSAGE 0x17
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#define IGMPV3_HOST_MEMBERSHIP_REPORT 0x22 /* V3 version of 0x12 */
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#define IGMP_MTRACE_RESP 0x1e
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#define IGMP_MTRACE 0x1f
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#define IGMP_MRDISC_ADV 0x30 /* From RFC4286 */
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/*
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* Use the BSD names for these for compatibility
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*/
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#define IGMP_DELAYING_MEMBER 0x01
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#define IGMP_IDLE_MEMBER 0x02
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#define IGMP_LAZY_MEMBER 0x03
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#define IGMP_SLEEPING_MEMBER 0x04
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#define IGMP_AWAKENING_MEMBER 0x05
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#define IGMP_MINLEN 8
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#define IGMP_MAX_HOST_REPORT_DELAY 10 /* max delay for response to */
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/* query (in seconds) */
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#define IGMP_TIMER_SCALE 10 /* denotes that the igmphdr->timer field */
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/* specifies time in 10th of seconds */
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#define IGMP_AGE_THRESHOLD 400 /* If this host don't hear any IGMP V1 */
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/* message in this period of time, */
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/* revert to IGMP v2 router. */
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#define IGMP_ALL_HOSTS htonl(0xE0000001L)
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#define IGMP_ALL_ROUTER htonl(0xE0000002L)
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#define IGMPV3_ALL_MCR htonl(0xE0000016L)
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#define IGMP_LOCAL_GROUP htonl(0xE0000000L)
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#define IGMP_LOCAL_GROUP_MASK htonl(0xFFFFFF00L)
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/*
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* struct for keeping the multicast list in
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*/
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#endif /* _UAPI_LINUX_IGMP_H */
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