FM / linux

/usr/src/linux-headers-5.15.0-190/include/linux/

/usr/src/linux-headers-5.15.0-190/include/linux

Name	Size	Mode	Actions
amba/	-	0755	rm
atomic/	-	0755	rm
avf/	-	0755	rm
bcma/	-	0755	rm
byteorder/	-	0755	rm
can/	-	0755	rm
ceph/	-	0755	rm
clk/	-	0755	rm
crush/	-	0755	rm
decompress/	-	0755	rm
device/	-	0755	rm
dma/	-	0755	rm
dsa/	-	0755	rm
extcon/	-	0755	rm
firmware/	-	0755	rm
fpga/	-	0755	rm
fsl/	-	0755	rm
gpio/	-	0755	rm
greybus/	-	0755	rm
hsi/	-	0755	rm
i3c/	-	0755	rm
iio/	-	0755	rm
input/	-	0755	rm
irqchip/	-	0755	rm
isdn/	-	0755	rm
lockd/	-	0755	rm
mailbox/	-	0755	rm
mdio/	-	0755	rm
mfd/	-	0755	rm
mlx4/	-	0755	rm
mlx5/	-	0755	rm
mmc/	-	0755	rm
mtd/	-	0755	rm
mux/	-	0755	rm
net/	-	0755	rm
netfilter/	-	0755	rm
netfilter_arp/	-	0755	rm
netfilter_bridge/	-	0755	rm
netfilter_ipv4/	-	0755	rm
netfilter_ipv6/	-	0755	rm
pcs/	-	0755	rm
perf/	-	0755	rm
phy/	-	0755	rm
pinctrl/	-	0755	rm
platform_data/	-	0755	rm
power/	-	0755	rm
qed/	-	0755	rm
raid/	-	0755	rm
regulator/	-	0755	rm
remoteproc/	-	0755	rm
reset/	-	0755	rm
rpmsg/	-	0755	rm
rtc/	-	0755	rm
sched/	-	0755	rm
soc/	-	0755	rm
soundwire/	-	0755	rm
spi/	-	0755	rm
ssb/	-	0755	rm
sunrpc/	-	0755	rm
surface_aggregator/	-	0755	rm
ulpi/	-	0755	rm
unaligned/	-	0755	rm
usb/	-	0755	rm
8250_pci.h	1038	0644	edit dl rm
a.out.h	354	0644	edit dl rm
acct.h	2551	0644	edit dl rm
acpi.h	40902	0644	edit dl rm
acpi_dma.h	3154	0644	edit dl rm
acpi_iort.h	2403	0644	edit dl rm
acpi_mdio.h	819	0644	edit dl rm
acpi_pmtmr.h	674	0644	edit dl rm
acpi_viot.h	478	0644	edit dl rm
adb.h	1832	0644	edit dl rm
adfs_fs.h	574	0644	edit dl rm
adreno-smmu-priv.h	2807	0644	edit dl rm
adxl.h	310	0644	edit dl rm
aer.h	1822	0644	edit dl rm
agpgart.h	3881	0644	edit dl rm
agp_backend.h	3534	0644	edit dl rm
ahci-remap.h	607	0644	edit dl rm
ahci_platform.h	1747	0644	edit dl rm
aio.h	651	0644	edit dl rm
alarmtimer.h	1990	0644	edit dl rm
alcor_pci.h	9043	0644	edit dl rm
align.h	552	0644	edit dl rm
altera_jtaguart.h	379	0644	edit dl rm
altera_uart.h	397	0644	edit dl rm
amd-iommu.h	6325	0644	edit dl rm
anon_inodes.h	670	0644	edit dl rm
apm-emulation.h	1599	0644	edit dl rm
apm_bios.h	2305	0644	edit dl rm
apple-gmux.h	918	0644	edit dl rm
apple_bl.h	498	0644	edit dl rm
arch_topology.h	2551	0644	edit dl rm
arm-cci.h	1390	0644	edit dl rm
arm-smccc.h	17382	0644	edit dl rm
armada-37xx-rwtm-mailbox.h	431	0644	edit dl rm
arm_ffa.h	7545	0644	edit dl rm
arm_sdei.h	2730	0644	edit dl rm
array_size.h	332	0644	edit dl rm
ascii85.h	555	0644	edit dl rm
asn1.h	1832	0644	edit dl rm
asn1_ber_bytecode.h	2576	0644	edit dl rm
asn1_decoder.h	468	0644	edit dl rm
asn1_encoder.h	1006	0644	edit dl rm
assoc_array.h	2949	0644	edit dl rm
assoc_array_priv.h	5423	0644	edit dl rm
async.h	4439	0644	edit dl rm
async_tx.h	6860	0644	edit dl rm
ata.h	33799	0644	edit dl rm
atalk.h	4586	0644	edit dl rm
ata_platform.h	749	0644	edit dl rm
ath9k_platform.h	1477	0644	edit dl rm
atm.h	287	0644	edit dl rm
atmdev.h	10477	0644	edit dl rm
atmel-isc-media.h	2115	0644	edit dl rm
atmel-mci.h	1429	0644	edit dl rm
atmel-ssc.h	9971	0644	edit dl rm
atmel_pdc.h	1295	0644	edit dl rm
atm_tcp.h	511	0644	edit dl rm
atomic.h	2644	0644	edit dl rm
attribute_container.h	2803	0644	edit dl rm
audit.h	19921	0644	edit dl rm
auto_dev-ioctl.h	296	0644	edit dl rm
auto_fs.h	278	0644	edit dl rm
auxiliary_bus.h	2539	0644	edit dl rm
auxvec.h	304	0644	edit dl rm
average.h	2481	0644	edit dl rm
backing-dev-defs.h	8753	0644	edit dl rm
backing-dev.h	12189	0644	edit dl rm
backlight.h	13447	0644	edit dl rm
badblocks.h	2188	0644	edit dl rm
balloon_compaction.h	5892	0644	edit dl rm
bcd.h	559	0644	edit dl rm
bch.h	2152	0644	edit dl rm
bcm47xx_nvram.h	1033	0644	edit dl rm
bcm47xx_sprom.h	616	0644	edit dl rm
bcm47xx_wdt.h	555	0644	edit dl rm
bcm963xx_nvram.h	3036	0644	edit dl rm
bcm963xx_tag.h	3685	0644	edit dl rm
binfmts.h	4683	0644	edit dl rm
bio.h	20108	0644	edit dl rm
bitfield.h	5460	0644	edit dl rm
bitmap.h	22664	0644	edit dl rm
bitops.h	8733	0644	edit dl rm
bitrev.h	2594	0644	edit dl rm
bits.h	1387	0644	edit dl rm
bit_spinlock.h	2360	0644	edit dl rm
blk-cgroup.h	22648	0644	edit dl rm
blk-crypto.h	4117	0644	edit dl rm
blk-mq-pci.h	269	0644	edit dl rm
blk-mq-rdma.h	273	0644	edit dl rm
blk-mq-virtio.h	293	0644	edit dl rm
blk-mq.h	19834	0644	edit dl rm
blk-pm.h	708	0644	edit dl rm
blkdev.h	58041	0644	edit dl rm
blkpg.h	436	0644	edit dl rm
blktrace_api.h	3858	0644	edit dl rm
blk_types.h	15669	0644	edit dl rm
blockgroup_lock.h	810	0644	edit dl rm
bma150.h	1286	0644	edit dl rm
bootconfig.h	8712	0644	edit dl rm
bootmem_info.h	1733	0644	edit dl rm
bottom_half.h	974	0644	edit dl rm
bpf-cgroup.h	18796	0644	edit dl rm
bpf-netns.h	1559	0644	edit dl rm
bpf.h	76212	0644	edit dl rm
bpfilter.h	791	0644	edit dl rm
bpfptr.h	2029	0644	edit dl rm
bpf_lirc.h	698	0644	edit dl rm
bpf_local_storage.h	5359	0644	edit dl rm
bpf_lsm.h	1456	0644	edit dl rm
bpf_trace.h	166	0644	edit dl rm
bpf_types.h	5536	0644	edit dl rm
bpf_verifier.h	20865	0644	edit dl rm
brcmphy.h	13994	0644	edit dl rm
bsearch.h	624	0644	edit dl rm
bsg-lib.h	1759	0644	edit dl rm
bsg.h	492	0644	edit dl rm
btf.h	7432	0644	edit dl rm
btf_ids.h	5463	0644	edit dl rm
btree-128.h	2737	0644	edit dl rm
btree-type.h	3991	0644	edit dl rm
btree.h	7000	0644	edit dl rm
btrfs.h	145	0644	edit dl rm
buffer_head.h	14814	0644	edit dl rm
bug.h	2220	0644	edit dl rm
build-salt.h	375	0644	edit dl rm
buildid.h	561	0644	edit dl rm
build_bug.h	2823	0644	edit dl rm
bvec.h	6319	0644	edit dl rm
c2port.h	1384	0644	edit dl rm
cache.h	2616	0644	edit dl rm
cacheinfo.h	3837	0644	edit dl rm
capability.h	8486	0644	edit dl rm
cb710.h	5490	0644	edit dl rm
cciss_ioctl.h	1053	0644	edit dl rm
ccp.h	18577	0644	edit dl rm
cc_platform.h	2378	0644	edit dl rm
cdev.h	845	0644	edit dl rm
cdrom.h	9268	0644	edit dl rm
cfag12864b.h	1509	0644	edit dl rm
cfi.h	1152	0644	edit dl rm
cgroup-defs.h	24815	0644	edit dl rm
cgroup.h	28840	0644	edit dl rm
cgroup_rdma.h	1206	0644	edit dl rm
cgroup_subsys.h	1259	0644	edit dl rm
circ_buf.h	1120	0644	edit dl rm
cleancache.h	3982	0644	edit dl rm
cleanup.h	4986	0644	edit dl rm
clk-provider.h	59330	0644	edit dl rm
clk.h	34418	0644	edit dl rm
clkdev.h	1322	0644	edit dl rm
clockchips.h	7445	0644	edit dl rm
clocksource.h	10227	0644	edit dl rm
clocksource_ids.h	247	0644	edit dl rm
cm4000_cs.h	199	0644	edit dl rm
cma.h	2004	0644	edit dl rm
cnt32_to_63.h	3545	0644	edit dl rm
cn_proc.h	1890	0644	edit dl rm
coda.h	2215	0644	edit dl rm
compaction.h	7319	0644	edit dl rm
compat.h	32122	0644	edit dl rm
compiler-clang.h	4150	0644	edit dl rm
compiler-gcc.h	5021	0644	edit dl rm
compiler-intel.h	949	0644	edit dl rm
compiler-version.h	517	0644	edit dl rm
compiler.h	8553	0644	edit dl rm
compiler_attributes.h	13557	0644	edit dl rm
compiler_types.h	11023	0644	edit dl rm
completion.h	4101	0644	edit dl rm
component.h	4163	0644	edit dl rm
configfs.h	8683	0644	edit dl rm
connector.h	3927	0644	edit dl rm
console.h	7758	0644	edit dl rm
consolemap.h	1076	0644	edit dl rm
console_struct.h	7253	0644	edit dl rm
const.h	421	0644	edit dl rm
container.h	610	0644	edit dl rm
context_tracking.h	3362	0644	edit dl rm
context_tracking_state.h	1616	0644	edit dl rm
cookie.h	1254	0644	edit dl rm
cordic.h	2132	0644	edit dl rm
coredump.h	1154	0644	edit dl rm
coresight-pmu.h	1355	0644	edit dl rm
coresight-stm.h	152	0644	edit dl rm
coresight.h	18449	0644	edit dl rm
counter.h	15318	0644	edit dl rm
count_zeros.h	1453	0644	edit dl rm
cper.h	16963	0644	edit dl rm
cpu.h	8485	0644	edit dl rm
cpufeature.h	1751	0644	edit dl rm
cpufreq.h	33539	0644	edit dl rm
cpuhotplug.h	16949	0644	edit dl rm
cpuidle.h	10516	0644	edit dl rm
cpuidle_haltpoll.h	312	0644	edit dl rm
cpumask.h	30089	0644	edit dl rm
cpuset.h	8351	0644	edit dl rm
cpu_cooling.h	1901	0644	edit dl rm
cpu_pm.h	2433	0644	edit dl rm
cpu_rmap.h	1721	0644	edit dl rm
crash_core.h	3465	0644	edit dl rm
crash_dump.h	4149	0644	edit dl rm
crc-ccitt.h	609	0644	edit dl rm
crc-itu-t.h	531	0644	edit dl rm
crc-t10dif.h	453	0644	edit dl rm
crc4.h	192	0644	edit dl rm
crc7.h	316	0644	edit dl rm
crc8.h	3747	0644	edit dl rm
crc16.h	540	0644	edit dl rm
crc32.h	2894	0644	edit dl rm
crc32c.h	331	0644	edit dl rm
crc32poly.h	610	0644	edit dl rm
crc64.h	280	0644	edit dl rm
cred.h	12804	0644	edit dl rm
crypto.h	27890	0644	edit dl rm
cs5535.h	6277	0644	edit dl rm
ctype.h	1912	0644	edit dl rm
cuda.h	613	0644	edit dl rm
damon.h	10601	0644	edit dl rm
dasd_mod.h	204	0644	edit dl rm
davinci_emac.h	1080	0644	edit dl rm
dax.h	6719	0644	edit dl rm
dca.h	1922	0644	edit dl rm
dcache.h	19076	0644	edit dl rm
dccp.h	10988	0644	edit dl rm
debugfs.h	12253	0644	edit dl rm
debugobjects.h	4085	0644	edit dl rm
debug_locks.h	1627	0644	edit dl rm
delay.h	2490	0644	edit dl rm
delayacct.h	5584	0644	edit dl rm
delayed_call.h	709	0644	edit dl rm
devcoredump.h	2266	0644	edit dl rm
devfreq-event.h	6095	0644	edit dl rm
devfreq.h	14370	0644	edit dl rm
devfreq_cooling.h	2763	0644	edit dl rm
device-mapper.h	19371	0644	edit dl rm
device.h	35226	0644	edit dl rm
device_cgroup.h	1609	0644	edit dl rm
devm-helpers.h	2740	0644	edit dl rm
devpts_fs.h	1156	0644	edit dl rm
dev_printk.h	9883	0644	edit dl rm
dfl.h	2435	0644	edit dl rm
digsig.h	1212	0644	edit dl rm
dim.h	9421	0644	edit dl rm
dio.h	11019	0644	edit dl rm
dirent.h	215	0644	edit dl rm
dlm.h	6005	0644	edit dl rm
dlm_plock.h	532	0644	edit dl rm
dm-bufio.h	4992	0644	edit dl rm
dm-dirty-log.h	4038	0644	edit dl rm
dm-io.h	1980	0644	edit dl rm
dm-kcopyd.h	3013	0644	edit dl rm
dm-region-hash.h	3182	0644	edit dl rm
dm9000.h	987	0644	edit dl rm
dma-buf-map.h	8318	0644	edit dl rm
dma-buf.h	20962	0644	edit dl rm
dma-direct.h	3681	0644	edit dl rm
dma-direction.h	407	0644	edit dl rm
dma-fence-array.h	2191	0644	edit dl rm
dma-fence-chain.h	3144	0644	edit dl rm
dma-fence.h	21357	0644	edit dl rm
dma-heap.h	1616	0644	edit dl rm
dma-iommu.h	2265	0644	edit dl rm
dma-map-ops.h	13197	0644	edit dl rm
dma-mapping.h	20596	0644	edit dl rm
dma-resv.h	12236	0644	edit dl rm
dmaengine.h	54851	0644	edit dl rm
dmapool.h	1832	0644	edit dl rm
dmar.h	7929	0644	edit dl rm
dmi.h	4512	0644	edit dl rm
dnotify.h	1044	0644	edit dl rm
dns_resolver.h	1390	0644	edit dl rm
dqblk_qtree.h	2238	0644	edit dl rm
dqblk_v1.h	327	0644	edit dl rm
dqblk_v2.h	406	0644	edit dl rm
drbd.h	10311	0644	edit dl rm
drbd_genl.h	22010	0644	edit dl rm
drbd_genl_api.h	1808	0644	edit dl rm
drbd_limits.h	8003	0644	edit dl rm
ds2782_battery.h	158	0644	edit dl rm
dtlk.h	3584	0644	edit dl rm
dtpm.h	1684	0644	edit dl rm
dw_apb_timer.h	1566	0644	edit dl rm
dynamic_debug.h	6471	0644	edit dl rm
dynamic_queue_limits.h	3812	0644	edit dl rm
earlycpio.h	359	0644	edit dl rm
ecryptfs.h	3915	0644	edit dl rm
edac.h	19924	0644	edit dl rm
edd.h	1077	0644	edit dl rm
eeprom_93cx6.h	2707	0644	edit dl rm
eeprom_93xx46.h	1062	0644	edit dl rm
efi-bgrt.h	644	0644	edit dl rm
efi.h	43038	0644	edit dl rm
efi_embedded_fw.h	1060	0644	edit dl rm
efs_vh.h	1585	0644	edit dl rm
eisa.h	3031	0644	edit dl rm
elevator.h	5653	0644	edit dl rm
elf-fdpic.h	2030	0644	edit dl rm
elf-randomize.h	583	0644	edit dl rm
elf.h	3030	0644	edit dl rm
elfcore-compat.h	1302	0644	edit dl rm
elfcore.h	4209	0644	edit dl rm
elfnote-lto.h	314	0644	edit dl rm
elfnote.h	3626	0644	edit dl rm
enclosure.h	4112	0644	edit dl rm
energy_model.h	8361	0644	edit dl rm
entry-common.h	17359	0644	edit dl rm
entry-kvm.h	2800	0644	edit dl rm
err.h	1527	0644	edit dl rm
errname.h	283	0644	edit dl rm
errno.h	1481	0644	edit dl rm
error-injection.h	607	0644	edit dl rm
errqueue.h	524	0644	edit dl rm
errseq.h	382	0644	edit dl rm
etherdevice.h	17607	0644	edit dl rm
ethtool.h	32505	0644	edit dl rm
ethtool_netlink.h	2029	0644	edit dl rm
eventfd.h	2336	0644	edit dl rm
eventpoll.h	2472	0644	edit dl rm
evm.h	3500	0644	edit dl rm
export.h	5394	0644	edit dl rm
exportfs.h	8421	0644	edit dl rm
ext2_fs.h	967	0644	edit dl rm
extable.h	1309	0644	edit dl rm
extcon-provider.h	3919	0644	edit dl rm
extcon.h	10399	0644	edit dl rm
f2fs_fs.h	19471	0644	edit dl rm
f75375s.h	541	0644	edit dl rm
falloc.h	1624	0644	edit dl rm
fanotify.h	4547	0644	edit dl rm
fault-inject-usercopy.h	496	0644	edit dl rm
fault-inject.h	1975	0644	edit dl rm
fb.h	28958	0644	edit dl rm
fbcon.h	2256	0644	edit dl rm
fcdevice.h	774	0644	edit dl rm
fcntl.h	1698	0644	edit dl rm
fd.h	490	0644	edit dl rm
fddidevice.h	833	0644	edit dl rm
fdtable.h	3571	0644	edit dl rm
fec.h	463	0644	edit dl rm
fiemap.h	713	0644	edit dl rm
file.h	3158	0644	edit dl rm
fileattr.h	1952	0644	edit dl rm
filter.h	43995	0644	edit dl rm
fips.h	303	0644	edit dl rm
firewire.h	13718	0644	edit dl rm
firmware-map.h	959	0644	edit dl rm
firmware.h	3348	0644	edit dl rm
fixp-arith.h	4290	0644	edit dl rm
flat.h	2629	0644	edit dl rm
flex_proportions.h	2881	0644	edit dl rm
font.h	1714	0644	edit dl rm
fortify-string.h	9329	0644	edit dl rm
freelist.h	3890	0644	edit dl rm
freezer.h	9193	0644	edit dl rm
frontswap.h	3118	0644	edit dl rm
fs.h	125506	0644	edit dl rm
fscache-cache.h	19025	0644	edit dl rm
fscache.h	30303	0644	edit dl rm
fscrypt.h	30622	0644	edit dl rm
fsi-occ.h	681	0644	edit dl rm
fsi-sbefifo.h	629	0644	edit dl rm
fsi.h	2318	0644	edit dl rm
fsl-diu-fb.h	3963	0644	edit dl rm
fsldma.h	202	0644	edit dl rm
fsl_devices.h	4261	0644	edit dl rm
fsl_hypervisor.h	2824	0644	edit dl rm
fsl_ifc.h	25063	0644	edit dl rm
fsnotify.h	10287	0644	edit dl rm
fsnotify_backend.h	30076	0644	edit dl rm
fsverity.h	6914	0644	edit dl rm
fs_context.h	8818	0644	edit dl rm
fs_enet_pd.h	3457	0644	edit dl rm
fs_parser.h	4543	0644	edit dl rm
fs_pin.h	539	0644	edit dl rm
fs_stack.h	811	0644	edit dl rm
fs_struct.h	1066	0644	edit dl rm
fs_types.h	2071	0644	edit dl rm
fs_uart_pd.h	1523	0644	edit dl rm
ftrace.h	35597	0644	edit dl rm
ftrace_irq.h	884	0644	edit dl rm
futex.h	2497	0644	edit dl rm
fwnode.h	7535	0644	edit dl rm
fwnode_mdio.h	858	0644	edit dl rm
gameport.h	5549	0644	edit dl rm
gcd.h	193	0644	edit dl rm
genalloc.h	7912	0644	edit dl rm
generic-radix-tree.h	6504	0644	edit dl rm
genetlink.h	589	0644	edit dl rm
genhd.h	9055	0644	edit dl rm
genl_magic_func.h	11809	0644	edit dl rm
genl_magic_struct.h	7793	0644	edit dl rm
getcpu.h	641	0644	edit dl rm
gfp.h	26892	0644	edit dl rm
glob.h	256	0644	edit dl rm
gnss.h	1601	0644	edit dl rm
goldfish.h	878	0644	edit dl rm
gpio-pxa.h	571	0644	edit dl rm
gpio.h	5423	0644	edit dl rm
gpio_keys.h	1782	0644	edit dl rm
greybus.h	4240	0644	edit dl rm
hardirq.h	3516	0644	edit dl rm
hash.h	3071	0644	edit dl rm
hashtable.h	6827	0644	edit dl rm
hdlc.h	3267	0644	edit dl rm
hdlcdrv.h	6468	0644	edit dl rm
hdmi.h	12705	0644	edit dl rm
hid-debug.h	1458	0644	edit dl rm
hid-roccat.h	484	0644	edit dl rm
hid-sensor-hub.h	9190	0644	edit dl rm
hid-sensor-ids.h	7617	0644	edit dl rm
hid.h	38923	0644	edit dl rm
hidden.h	966	0644	edit dl rm
hiddev.h	1458	0644	edit dl rm
hidraw.h	1146	0644	edit dl rm
highmem-internal.h	5239	0644	edit dl rm
highmem.h	9731	0644	edit dl rm
highuid.h	3194	0644	edit dl rm
hil.h	18857	0644	edit dl rm
hil_mlc.h	5248	0644	edit dl rm
hippidevice.h	1052	0644	edit dl rm
hmm.h	4168	0644	edit dl rm
host1x.h	10993	0644	edit dl rm
hpet.h	2615	0644	edit dl rm
hp_sdc.h	14352	0644	edit dl rm
hrtimer.h	16515	0644	edit dl rm
hrtimer_defs.h	660	0644	edit dl rm
htcpld.h	617	0644	edit dl rm
hugetlb.h	30606	0644	edit dl rm
hugetlb_cgroup.h	7241	0644	edit dl rm
hugetlb_inline.h	374	0644	edit dl rm
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Edit: /usr/src/linux-headers-5.15.0-190/include/linux/skbuff.h (141509B)

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *	Definitions for the 'struct sk_buff' memory handlers.
 *
 *	Authors:
 *		Alan Cox, <gw4pts@gw4pts.ampr.org>
 *		Florian La Roche, <rzsfl@rz.uni-sb.de>
 */

#ifndef _LINUX_SKBUFF_H
#define _LINUX_SKBUFF_H

#include <linux/kernel.h>
#include <linux/compiler.h>
#include <linux/time.h>
#include <linux/bug.h>
#include <linux/bvec.h>
#include <linux/cache.h>
#include <linux/rbtree.h>
#include <linux/socket.h>
#include <linux/refcount.h>

#include <linux/atomic.h>
#include <asm/types.h>
#include <linux/spinlock.h>
#include <linux/net.h>
#include <linux/textsearch.h>
#include <net/checksum.h>
#include <linux/rcupdate.h>
#include <linux/hrtimer.h>
#include <linux/dma-mapping.h>
#include <linux/netdev_features.h>
#include <linux/sched.h>
#include <linux/sched/clock.h>
#include <net/flow_dissector.h>
#include <linux/splice.h>
#include <linux/in6.h>
#include <linux/if_packet.h>
#include <net/flow.h>
#include <net/page_pool.h>
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
#include <linux/netfilter/nf_conntrack_common.h>
#endif

/* The interface for checksum offload between the stack and networking drivers
 * is as follows...
 *
 * A. IP checksum related features
 *
 * Drivers advertise checksum offload capabilities in the features of a device.
 * From the stack's point of view these are capabilities offered by the driver.
 * A driver typically only advertises features that it is capable of offloading
 * to its device.
 *
 * The checksum related features are:
 *
 *	NETIF_F_HW_CSUM	- The driver (or its device) is able to compute one
 *			  IP (one's complement) checksum for any combination
 *			  of protocols or protocol layering. The checksum is
 *			  computed and set in a packet per the CHECKSUM_PARTIAL
 *			  interface (see below).
 *
 *	NETIF_F_IP_CSUM - Driver (device) is only able to checksum plain
 *			  TCP or UDP packets over IPv4. These are specifically
 *			  unencapsulated packets of the form IPv4|TCP or
 *			  IPv4|UDP where the Protocol field in the IPv4 header
 *			  is TCP or UDP. The IPv4 header may contain IP options.
 *			  This feature cannot be set in features for a device
 *			  with NETIF_F_HW_CSUM also set. This feature is being
 *			  DEPRECATED (see below).
 *
 *	NETIF_F_IPV6_CSUM - Driver (device) is only able to checksum plain
 *			  TCP or UDP packets over IPv6. These are specifically
 *			  unencapsulated packets of the form IPv6|TCP or
 *			  IPv6|UDP where the Next Header field in the IPv6
 *			  header is either TCP or UDP. IPv6 extension headers
 *			  are not supported with this feature. This feature
 *			  cannot be set in features for a device with
 *			  NETIF_F_HW_CSUM also set. This feature is being
 *			  DEPRECATED (see below).
 *
 *	NETIF_F_RXCSUM - Driver (device) performs receive checksum offload.
 *			 This flag is only used to disable the RX checksum
 *			 feature for a device. The stack will accept receive
 *			 checksum indication in packets received on a device
 *			 regardless of whether NETIF_F_RXCSUM is set.
 *
 * B. Checksumming of received packets by device. Indication of checksum
 *    verification is set in skb->ip_summed. Possible values are:
 *
 * CHECKSUM_NONE:
 *
 *   Device did not checksum this packet e.g. due to lack of capabilities.
 *   The packet contains full (though not verified) checksum in packet but
 *   not in skb->csum. Thus, skb->csum is undefined in this case.
 *
 * CHECKSUM_UNNECESSARY:
 *
 *   The hardware you're dealing with doesn't calculate the full checksum
 *   (as in CHECKSUM_COMPLETE), but it does parse headers and verify checksums
 *   for specific protocols. For such packets it will set CHECKSUM_UNNECESSARY
 *   if their checksums are okay. skb->csum is still undefined in this case
 *   though. A driver or device must never modify the checksum field in the
 *   packet even if checksum is verified.
 *
 *   CHECKSUM_UNNECESSARY is applicable to following protocols:
 *     TCP: IPv6 and IPv4.
 *     UDP: IPv4 and IPv6. A device may apply CHECKSUM_UNNECESSARY to a
 *       zero UDP checksum for either IPv4 or IPv6, the networking stack
 *       may perform further validation in this case.
 *     GRE: only if the checksum is present in the header.
 *     SCTP: indicates the CRC in SCTP header has been validated.
 *     FCOE: indicates the CRC in FC frame has been validated.
 *
 *   skb->csum_level indicates the number of consecutive checksums found in
 *   the packet minus one that have been verified as CHECKSUM_UNNECESSARY.
 *   For instance if a device receives an IPv6->UDP->GRE->IPv4->TCP packet
 *   and a device is able to verify the checksums for UDP (possibly zero),
 *   GRE (checksum flag is set) and TCP, skb->csum_level would be set to
 *   two. If the device were only able to verify the UDP checksum and not
 *   GRE, either because it doesn't support GRE checksum or because GRE
 *   checksum is bad, skb->csum_level would be set to zero (TCP checksum is
 *   not considered in this case).
 *
 * CHECKSUM_COMPLETE:
 *
 *   This is the most generic way. The device supplied checksum of the _whole_
 *   packet as seen by netif_rx() and fills in skb->csum. This means the
 *   hardware doesn't need to parse L3/L4 headers to implement this.
 *
 *   Notes:
 *   - Even if device supports only some protocols, but is able to produce
 *     skb->csum, it MUST use CHECKSUM_COMPLETE, not CHECKSUM_UNNECESSARY.
 *   - CHECKSUM_COMPLETE is not applicable to SCTP and FCoE protocols.
 *
 * CHECKSUM_PARTIAL:
 *
 *   A checksum is set up to be offloaded to a device as described in the
 *   output description for CHECKSUM_PARTIAL. This may occur on a packet
 *   received directly from another Linux OS, e.g., a virtualized Linux kernel
 *   on the same host, or it may be set in the input path in GRO or remote
 *   checksum offload. For the purposes of checksum verification, the checksum
 *   referred to by skb->csum_start + skb->csum_offset and any preceding
 *   checksums in the packet are considered verified. Any checksums in the
 *   packet that are after the checksum being offloaded are not considered to
 *   be verified.
 *
 * C. Checksumming on transmit for non-GSO. The stack requests checksum offload
 *    in the skb->ip_summed for a packet. Values are:
 *
 * CHECKSUM_PARTIAL:
 *
 *   The driver is required to checksum the packet as seen by hard_start_xmit()
 *   from skb->csum_start up to the end, and to record/write the checksum at
 *   offset skb->csum_start + skb->csum_offset. A driver may verify that the
 *   csum_start and csum_offset values are valid values given the length and
 *   offset of the packet, but it should not attempt to validate that the
 *   checksum refers to a legitimate transport layer checksum -- it is the
 *   purview of the stack to validate that csum_start and csum_offset are set
 *   correctly.
 *
 *   When the stack requests checksum offload for a packet, the driver MUST
 *   ensure that the checksum is set correctly. A driver can either offload the
 *   checksum calculation to the device, or call skb_checksum_help (in the case
 *   that the device does not support offload for a particular checksum).
 *
 *   NETIF_F_IP_CSUM and NETIF_F_IPV6_CSUM are being deprecated in favor of
 *   NETIF_F_HW_CSUM. New devices should use NETIF_F_HW_CSUM to indicate
 *   checksum offload capability.
 *   skb_csum_hwoffload_help() can be called to resolve CHECKSUM_PARTIAL based
 *   on network device checksumming capabilities: if a packet does not match
 *   them, skb_checksum_help or skb_crc32c_help (depending on the value of
 *   csum_not_inet, see item D.) is called to resolve the checksum.
 *
 * CHECKSUM_NONE:
 *
 *   The skb was already checksummed by the protocol, or a checksum is not
 *   required.
 *
 * CHECKSUM_UNNECESSARY:
 *
 *   This has the same meaning as CHECKSUM_NONE for checksum offload on
 *   output.
 *
 * CHECKSUM_COMPLETE:
 *   Not used in checksum output. If a driver observes a packet with this value
 *   set in skbuff, it should treat the packet as if CHECKSUM_NONE were set.
 *
 * D. Non-IP checksum (CRC) offloads
 *
 *   NETIF_F_SCTP_CRC - This feature indicates that a device is capable of
 *     offloading the SCTP CRC in a packet. To perform this offload the stack
 *     will set csum_start and csum_offset accordingly, set ip_summed to
 *     CHECKSUM_PARTIAL and set csum_not_inet to 1, to provide an indication in
 *     the skbuff that the CHECKSUM_PARTIAL refers to CRC32c.
 *     A driver that supports both IP checksum offload and SCTP CRC32c offload
 *     must verify which offload is configured for a packet by testing the
 *     value of skb->csum_not_inet; skb_crc32c_csum_help is provided to resolve
 *     CHECKSUM_PARTIAL on skbs where csum_not_inet is set to 1.
 *
 *   NETIF_F_FCOE_CRC - This feature indicates that a device is capable of
 *     offloading the FCOE CRC in a packet. To perform this offload the stack
 *     will set ip_summed to CHECKSUM_PARTIAL and set csum_start and csum_offset
 *     accordingly. Note that there is no indication in the skbuff that the
 *     CHECKSUM_PARTIAL refers to an FCOE checksum, so a driver that supports
 *     both IP checksum offload and FCOE CRC offload must verify which offload
 *     is configured for a packet, presumably by inspecting packet headers.
 *
 * E. Checksumming on output with GSO.
 *
 * In the case of a GSO packet (skb_is_gso(skb) is true), checksum offload
 * is implied by the SKB_GSO_* flags in gso_type. Most obviously, if the
 * gso_type is SKB_GSO_TCPV4 or SKB_GSO_TCPV6, TCP checksum offload as
 * part of the GSO operation is implied. If a checksum is being offloaded
 * with GSO then ip_summed is CHECKSUM_PARTIAL, and both csum_start and
 * csum_offset are set to refer to the outermost checksum being offloaded
 * (two offloaded checksums are possible with UDP encapsulation).
 */

/* Don't change this without changing skb_csum_unnecessary! */
#define CHECKSUM_NONE		0
#define CHECKSUM_UNNECESSARY	1
#define CHECKSUM_COMPLETE	2
#define CHECKSUM_PARTIAL	3

/* Maximum value in skb->csum_level */
#define SKB_MAX_CSUM_LEVEL	3

#define SKB_DATA_ALIGN(X)	ALIGN(X, SMP_CACHE_BYTES)
#define SKB_WITH_OVERHEAD(X)	\
	((X) - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
#define SKB_MAX_ORDER(X, ORDER) \
	SKB_WITH_OVERHEAD((PAGE_SIZE << (ORDER)) - (X))
#define SKB_MAX_HEAD(X)		(SKB_MAX_ORDER((X), 0))
#define SKB_MAX_ALLOC		(SKB_MAX_ORDER(0, 2))

/* return minimum truesize of one skb containing X bytes of data */
#define SKB_TRUESIZE(X) ((X) +						\
			 SKB_DATA_ALIGN(sizeof(struct sk_buff)) +	\
			 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))

struct ahash_request;
struct net_device;
struct scatterlist;
struct pipe_inode_info;
struct iov_iter;
struct napi_struct;
struct bpf_prog;
union bpf_attr;
struct skb_ext;

#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
struct nf_bridge_info {
	enum {
		BRNF_PROTO_UNCHANGED,
		BRNF_PROTO_8021Q,
		BRNF_PROTO_PPPOE
	} orig_proto:8;
	u8			pkt_otherhost:1;
	u8			in_prerouting:1;
	u8			bridged_dnat:1;
	u8			sabotage_in_done:1;
	__u16			frag_max_size;
	struct net_device	*physindev;

/* always valid & non-NULL from FORWARD on, for physdev match */
	struct net_device	*physoutdev;
	union {
		/* prerouting: detect dnat in orig/reply direction */
		__be32          ipv4_daddr;
		struct in6_addr ipv6_daddr;

/* after prerouting + nat detected: store original source
		 * mac since neigh resolution overwrites it, only used while
		 * skb is out in neigh layer.
		 */
		char neigh_header[8];
	};
};
#endif

#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
/* Chain in tc_skb_ext will be used to share the tc chain with
 * ovs recirc_id. It will be set to the current chain by tc
 * and read by ovs to recirc_id.
 */
struct tc_skb_ext {
	__u32 chain;
	__u16 mru;
	__u16 zone;
	u8 post_ct:1;
	u8 post_ct_snat:1;
	u8 post_ct_dnat:1;
};
#endif

struct sk_buff_head {
	/* These two members must be first. */
	struct sk_buff	*next;
	struct sk_buff	*prev;

__u32		qlen;
	spinlock_t	lock;
};

struct sk_buff;

/* The reason of skb drop, which is used in kfree_skb_reason().
 * en...maybe they should be splited by group?
 *
 * Each item here should also be in 'TRACE_SKB_DROP_REASON', which is
 * used to translate the reason to string.
 */
enum skb_drop_reason {
	SKB_DROP_REASON_NOT_SPECIFIED,	/* drop reason is not specified */
	SKB_DROP_REASON_NO_SOCKET,	/* socket not found */
	SKB_DROP_REASON_PKT_TOO_SMALL,	/* packet size is too small */
	SKB_DROP_REASON_TCP_CSUM,	/* TCP checksum error */
	SKB_DROP_REASON_SOCKET_FILTER,	/* dropped by socket filter */
	SKB_DROP_REASON_UDP_CSUM,	/* UDP checksum error */
	SKB_DROP_REASON_NETFILTER_DROP,	/* dropped by netfilter */
	SKB_DROP_REASON_OTHERHOST,	/* packet don't belong to current
					 * host (interface is in promisc
					 * mode)
					 */
	SKB_DROP_REASON_IP_CSUM,	/* IP checksum error */
	SKB_DROP_REASON_IP_INHDR,	/* there is something wrong with
					 * IP header (see
					 * IPSTATS_MIB_INHDRERRORS)
					 */
	SKB_DROP_REASON_IP_RPFILTER,	/* IP rpfilter validate failed.
					 * see the document for rp_filter
					 * in ip-sysctl.rst for more
					 * information
					 */
	SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST, /* destination address of L2
						  * is multicast, but L3 is
						  * unicast.
						  */
	SKB_DROP_REASON_MAX,
};

/* To allow 64K frame to be packed as single skb without frag_list we
 * require 64K/PAGE_SIZE pages plus 1 additional page to allow for
 * buffers which do not start on a page boundary.
 *
 * Since GRO uses frags we allocate at least 16 regardless of page
 * size.
 */
#if (65536/PAGE_SIZE + 1) < 16
#define MAX_SKB_FRAGS 16UL
#else
#define MAX_SKB_FRAGS (65536/PAGE_SIZE + 1)
#endif
extern int sysctl_max_skb_frags;

/* Set skb_shinfo(skb)->gso_size to this in case you want skb_segment to
 * segment using its current segmentation instead.
 */
#define GSO_BY_FRAGS	0xFFFF

typedef struct bio_vec skb_frag_t;

/**
 * skb_frag_size() - Returns the size of a skb fragment
 * @frag: skb fragment
 */
static inline unsigned int skb_frag_size(const skb_frag_t *frag)
{
	return frag->bv_len;
}

/**
 * skb_frag_size_set() - Sets the size of a skb fragment
 * @frag: skb fragment
 * @size: size of fragment
 */
static inline void skb_frag_size_set(skb_frag_t *frag, unsigned int size)
{
	frag->bv_len = size;
}

/**
 * skb_frag_size_add() - Increments the size of a skb fragment by @delta
 * @frag: skb fragment
 * @delta: value to add
 */
static inline void skb_frag_size_add(skb_frag_t *frag, int delta)
{
	frag->bv_len += delta;
}

/**
 * skb_frag_size_sub() - Decrements the size of a skb fragment by @delta
 * @frag: skb fragment
 * @delta: value to subtract
 */
static inline void skb_frag_size_sub(skb_frag_t *frag, int delta)
{
	frag->bv_len -= delta;
}

/**
 * skb_frag_must_loop - Test if %p is a high memory page
 * @p: fragment's page
 */
static inline bool skb_frag_must_loop(struct page *p)
{
#if defined(CONFIG_HIGHMEM)
	if (IS_ENABLED(CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP) || PageHighMem(p))
		return true;
#endif
	return false;
}

/**
 *	skb_frag_foreach_page - loop over pages in a fragment
 *
 *	@f:		skb frag to operate on
 *	@f_off:		offset from start of f->bv_page
 *	@f_len:		length from f_off to loop over
 *	@p:		(temp var) current page
 *	@p_off:		(temp var) offset from start of current page,
 *	                           non-zero only on first page.
 *	@p_len:		(temp var) length in current page,
 *				   < PAGE_SIZE only on first and last page.
 *	@copied:	(temp var) length so far, excluding current p_len.
 *
 *	A fragment can hold a compound page, in which case per-page
 *	operations, notably kmap_atomic, must be called for each
 *	regular page.
 */
#define skb_frag_foreach_page(f, f_off, f_len, p, p_off, p_len, copied)	\
	for (p = skb_frag_page(f) + ((f_off) >> PAGE_SHIFT),		\
	     p_off = (f_off) & (PAGE_SIZE - 1),				\
	     p_len = skb_frag_must_loop(p) ?				\
	     min_t(u32, f_len, PAGE_SIZE - p_off) : f_len,		\
	     copied = 0;						\
	     copied < f_len;						\
	     copied += p_len, p++, p_off = 0,				\
	     p_len = min_t(u32, f_len - copied, PAGE_SIZE))		\

#define HAVE_HW_TIME_STAMP

/**
 * struct skb_shared_hwtstamps - hardware time stamps
 * @hwtstamp:	hardware time stamp transformed into duration
 *		since arbitrary point in time
 *
 * Software time stamps generated by ktime_get_real() are stored in
 * skb->tstamp.
 *
 * hwtstamps can only be compared against other hwtstamps from
 * the same device.
 *
 * This structure is attached to packets as part of the
 * &skb_shared_info. Use skb_hwtstamps() to get a pointer.
 */
struct skb_shared_hwtstamps {
	ktime_t	hwtstamp;
};

/* Definitions for tx_flags in struct skb_shared_info */
enum {
	/* generate hardware time stamp */
	SKBTX_HW_TSTAMP = 1 << 0,

/* generate software time stamp when queueing packet to NIC */
	SKBTX_SW_TSTAMP = 1 << 1,

/* device driver is going to provide hardware time stamp */
	SKBTX_IN_PROGRESS = 1 << 2,

/* generate wifi status information (where possible) */
	SKBTX_WIFI_STATUS = 1 << 4,

/* generate software time stamp when entering packet scheduling */
	SKBTX_SCHED_TSTAMP = 1 << 6,
};

#define SKBTX_ANY_SW_TSTAMP	(SKBTX_SW_TSTAMP    | \
				 SKBTX_SCHED_TSTAMP)
#define SKBTX_ANY_TSTAMP	(SKBTX_HW_TSTAMP | SKBTX_ANY_SW_TSTAMP)

/* Definitions for flags in struct skb_shared_info */
enum {
	/* use zcopy routines */
	SKBFL_ZEROCOPY_ENABLE = BIT(0),

/* This indicates at least one fragment might be overwritten
	 * (as in vmsplice(), sendfile() ...)
	 * If we need to compute a TX checksum, we'll need to copy
	 * all frags to avoid possible bad checksum
	 */
	SKBFL_SHARED_FRAG = BIT(1),
};

#define SKBFL_ZEROCOPY_FRAG	(SKBFL_ZEROCOPY_ENABLE | SKBFL_SHARED_FRAG)

/*
 * The callback notifies userspace to release buffers when skb DMA is done in
 * lower device, the skb last reference should be 0 when calling this.
 * The zerocopy_success argument is true if zero copy transmit occurred,
 * false on data copy or out of memory error caused by data copy attempt.
 * The ctx field is used to track device context.
 * The desc field is used to track userspace buffer index.
 */
struct ubuf_info {
	void (*callback)(struct sk_buff *, struct ubuf_info *,
			 bool zerocopy_success);
	union {
		struct {
			unsigned long desc;
			void *ctx;
		};
		struct {
			u32 id;
			u16 len;
			u16 zerocopy:1;
			u32 bytelen;
		};
	};
	refcount_t refcnt;
	u8 flags;

struct mmpin {
		struct user_struct *user;
		unsigned int num_pg;
	} mmp;
};

#define skb_uarg(SKB)	((struct ubuf_info *)(skb_shinfo(SKB)->destructor_arg))

int mm_account_pinned_pages(struct mmpin *mmp, size_t size);
void mm_unaccount_pinned_pages(struct mmpin *mmp);

struct ubuf_info *msg_zerocopy_alloc(struct sock *sk, size_t size);
struct ubuf_info *msg_zerocopy_realloc(struct sock *sk, size_t size,
				       struct ubuf_info *uarg);

void msg_zerocopy_put_abort(struct ubuf_info *uarg, bool have_uref);

void msg_zerocopy_callback(struct sk_buff *skb, struct ubuf_info *uarg,
			   bool success);

int skb_zerocopy_iter_dgram(struct sk_buff *skb, struct msghdr *msg, int len);
int skb_zerocopy_iter_stream(struct sock *sk, struct sk_buff *skb,
			     struct msghdr *msg, int len,
			     struct ubuf_info *uarg);

/* This data is invariant across clones and lives at
 * the end of the header data, ie. at skb->end.
 */
struct skb_shared_info {
	__u8		flags;
	__u8		meta_len;
	__u8		nr_frags;
	__u8		tx_flags;
	unsigned short	gso_size;
	/* Warning: this field is not always filled in (UFO)! */
	unsigned short	gso_segs;
	struct sk_buff	*frag_list;
	struct skb_shared_hwtstamps hwtstamps;
	unsigned int	gso_type;
	u32		tskey;

/*
	 * Warning : all fields before dataref are cleared in __alloc_skb()
	 */
	atomic_t	dataref;

/* Intermediate layers must ensure that destructor_arg
	 * remains valid until skb destructor */
	void *		destructor_arg;

/* must be last field, see pskb_expand_head() */
	skb_frag_t	frags[MAX_SKB_FRAGS];
};

/* We divide dataref into two halves.  The higher 16 bits hold references
 * to the payload part of skb->data.  The lower 16 bits hold references to
 * the entire skb->data.  A clone of a headerless skb holds the length of
 * the header in skb->hdr_len.
 *
 * All users must obey the rule that the skb->data reference count must be
 * greater than or equal to the payload reference count.
 *
 * Holding a reference to the payload part means that the user does not
 * care about modifications to the header part of skb->data.
 */
#define SKB_DATAREF_SHIFT 16
#define SKB_DATAREF_MASK ((1 << SKB_DATAREF_SHIFT) - 1)

enum {
	SKB_FCLONE_UNAVAILABLE,	/* skb has no fclone (from head_cache) */
	SKB_FCLONE_ORIG,	/* orig skb (from fclone_cache) */
	SKB_FCLONE_CLONE,	/* companion fclone skb (from fclone_cache) */
};

enum {
	SKB_GSO_TCPV4 = 1 << 0,

/* This indicates the skb is from an untrusted source. */
	SKB_GSO_DODGY = 1 << 1,

/* This indicates the tcp segment has CWR set. */
	SKB_GSO_TCP_ECN = 1 << 2,

SKB_GSO_TCP_FIXEDID = 1 << 3,

SKB_GSO_TCPV6 = 1 << 4,

SKB_GSO_FCOE = 1 << 5,

SKB_GSO_GRE = 1 << 6,

SKB_GSO_GRE_CSUM = 1 << 7,

SKB_GSO_IPXIP4 = 1 << 8,

SKB_GSO_IPXIP6 = 1 << 9,

SKB_GSO_UDP_TUNNEL = 1 << 10,

SKB_GSO_UDP_TUNNEL_CSUM = 1 << 11,

SKB_GSO_PARTIAL = 1 << 12,

SKB_GSO_TUNNEL_REMCSUM = 1 << 13,

SKB_GSO_SCTP = 1 << 14,

SKB_GSO_ESP = 1 << 15,

SKB_GSO_UDP = 1 << 16,

SKB_GSO_UDP_L4 = 1 << 17,

SKB_GSO_FRAGLIST = 1 << 18,
};

#if BITS_PER_LONG > 32
#define NET_SKBUFF_DATA_USES_OFFSET 1
#endif

#ifdef NET_SKBUFF_DATA_USES_OFFSET
typedef unsigned int sk_buff_data_t;
#else
typedef unsigned char *sk_buff_data_t;
#endif

/**
 *	struct sk_buff - socket buffer
 *	@next: Next buffer in list
 *	@prev: Previous buffer in list
 *	@tstamp: Time we arrived/left
 *	@skb_mstamp_ns: (aka @tstamp) earliest departure time; start point
 *		for retransmit timer
 *	@rbnode: RB tree node, alternative to next/prev for netem/tcp
 *	@list: queue head
 *	@sk: Socket we are owned by
 *	@dev: Device we arrived on/are leaving by
 *	@dev_scratch: (aka @dev) alternate use of @dev when @dev would be %NULL
 *	@cb: Control buffer. Free for use by every layer. Put private vars here
 *	@_skb_refdst: destination entry (with norefcount bit)
 *	@sp: the security path, used for xfrm
 *	@len: Length of actual data
 *	@data_len: Data length
 *	@mac_len: Length of link layer header
 *	@hdr_len: writable header length of cloned skb
 *	@csum: Checksum (must include start/offset pair)
 *	@csum_start: Offset from skb->head where checksumming should start
 *	@csum_offset: Offset from csum_start where checksum should be stored
 *	@priority: Packet queueing priority
 *	@ignore_df: allow local fragmentation
 *	@cloned: Head may be cloned (check refcnt to be sure)
 *	@ip_summed: Driver fed us an IP checksum
 *	@nohdr: Payload reference only, must not modify header
 *	@pkt_type: Packet class
 *	@fclone: skbuff clone status
 *	@ipvs_property: skbuff is owned by ipvs
 *	@inner_protocol_type: whether the inner protocol is
 *		ENCAP_TYPE_ETHER or ENCAP_TYPE_IPPROTO
 *	@remcsum_offload: remote checksum offload is enabled
 *	@offload_fwd_mark: Packet was L2-forwarded in hardware
 *	@offload_l3_fwd_mark: Packet was L3-forwarded in hardware
 *	@tc_skip_classify: do not classify packet. set by IFB device
 *	@tc_at_ingress: used within tc_classify to distinguish in/egress
 *	@redirected: packet was redirected by packet classifier
 *	@from_ingress: packet was redirected from the ingress path
 *	@peeked: this packet has been seen already, so stats have been
 *		done for it, don't do them again
 *	@nf_trace: netfilter packet trace flag
 *	@protocol: Packet protocol from driver
 *	@destructor: Destruct function
 *	@tcp_tsorted_anchor: list structure for TCP (tp->tsorted_sent_queue)
 *	@_sk_redir: socket redirection information for skmsg
 *	@_nfct: Associated connection, if any (with nfctinfo bits)
 *	@nf_bridge: Saved data about a bridged frame - see br_netfilter.c
 *	@skb_iif: ifindex of device we arrived on
 *	@tc_index: Traffic control index
 *	@hash: the packet hash
 *	@queue_mapping: Queue mapping for multiqueue devices
 *	@head_frag: skb was allocated from page fragments,
 *		not allocated by kmalloc() or vmalloc().
 *	@pfmemalloc: skbuff was allocated from PFMEMALLOC reserves
 *	@pp_recycle: mark the packet for recycling instead of freeing (implies
 *		page_pool support on driver)
 *	@active_extensions: active extensions (skb_ext_id types)
 *	@ndisc_nodetype: router type (from link layer)
 *	@ooo_okay: allow the mapping of a socket to a queue to be changed
 *	@l4_hash: indicate hash is a canonical 4-tuple hash over transport
 *		ports.
 *	@sw_hash: indicates hash was computed in software stack
 *	@wifi_acked_valid: wifi_acked was set
 *	@wifi_acked: whether frame was acked on wifi or not
 *	@no_fcs:  Request NIC to treat last 4 bytes as Ethernet FCS
 *	@encapsulation: indicates the inner headers in the skbuff are valid
 *	@encap_hdr_csum: software checksum is needed
 *	@csum_valid: checksum is already valid
 *	@csum_not_inet: use CRC32c to resolve CHECKSUM_PARTIAL
 *	@csum_complete_sw: checksum was completed by software
 *	@csum_level: indicates the number of consecutive checksums found in
 *		the packet minus one that have been verified as
 *		CHECKSUM_UNNECESSARY (max 3)
 *	@scm_io_uring: SKB holds io_uring registered files
 *	@dst_pending_confirm: need to confirm neighbour
 *	@decrypted: Decrypted SKB
 *	@slow_gro: state present at GRO time, slower prepare step required
 *	@napi_id: id of the NAPI struct this skb came from
 *	@sender_cpu: (aka @napi_id) source CPU in XPS
 *	@secmark: security marking
 *	@mark: Generic packet mark
 *	@reserved_tailroom: (aka @mark) number of bytes of free space available
 *		at the tail of an sk_buff
 *	@vlan_present: VLAN tag is present
 *	@vlan_proto: vlan encapsulation protocol
 *	@vlan_tci: vlan tag control information
 *	@inner_protocol: Protocol (encapsulation)
 *	@inner_ipproto: (aka @inner_protocol) stores ipproto when
 *		skb->inner_protocol_type == ENCAP_TYPE_IPPROTO;
 *	@inner_transport_header: Inner transport layer header (encapsulation)
 *	@inner_network_header: Network layer header (encapsulation)
 *	@inner_mac_header: Link layer header (encapsulation)
 *	@transport_header: Transport layer header
 *	@network_header: Network layer header
 *	@mac_header: Link layer header
 *	@kcov_handle: KCOV remote handle for remote coverage collection
 *	@tail: Tail pointer
 *	@end: End pointer
 *	@head: Head of buffer
 *	@data: Data head pointer
 *	@truesize: Buffer size
 *	@users: User count - see {datagram,tcp}.c
 *	@extensions: allocated extensions, valid if active_extensions is nonzero
 */

struct sk_buff {
	union {
		struct {
			/* These two members must be first. */
			struct sk_buff		*next;
			struct sk_buff		*prev;

union {
				struct net_device	*dev;
				/* Some protocols might use this space to store information,
				 * while device pointer would be NULL.
				 * UDP receive path is one user.
				 */
				unsigned long		dev_scratch;
			};
		};
		struct rb_node		rbnode; /* used in netem, ip4 defrag, and tcp stack */
		struct list_head	list;
	};

struct sock		*sk;

union {
		ktime_t		tstamp;
		u64		skb_mstamp_ns; /* earliest departure time */
	};
	/*
	 * This is the control buffer. It is free to use for every
	 * layer. Please put your private variables there. If you
	 * want to keep them across layers you have to do a skb_clone()
	 * first. This is owned by whoever has the skb queued ATM.
	 */
	char			cb[48] __aligned(8);

union {
		struct {
			unsigned long	_skb_refdst;
			void		(*destructor)(struct sk_buff *skb);
		};
		struct list_head	tcp_tsorted_anchor;
#ifdef CONFIG_NET_SOCK_MSG
		unsigned long		_sk_redir;
#endif
	};

#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
	unsigned long		 _nfct;
#endif
	unsigned int		len,
				data_len;
	__u16			mac_len,
				hdr_len;

/* Following fields are _not_ copied in __copy_skb_header()
	 * Note that queue_mapping is here mostly to fill a hole.
	 */
	__u16			queue_mapping;

/* if you move cloned around you also must adapt those constants */
#ifdef __BIG_ENDIAN_BITFIELD
#define CLONED_MASK	(1 << 7)
#else
#define CLONED_MASK	1
#endif
#define CLONED_OFFSET()		offsetof(struct sk_buff, __cloned_offset)

/* private: */
	__u8			__cloned_offset[0];
	/* public: */
	__u8			cloned:1,
				nohdr:1,
				fclone:2,
				peeked:1,
				head_frag:1,
				pfmemalloc:1,
				pp_recycle:1; /* page_pool recycle indicator */
#ifdef CONFIG_SKB_EXTENSIONS
	__u8			active_extensions;
#endif

/* fields enclosed in headers_start/headers_end are copied
	 * using a single memcpy() in __copy_skb_header()
	 */
	/* private: */
	__u32			headers_start[0];
	/* public: */

/* if you move pkt_type around you also must adapt those constants */
#ifdef __BIG_ENDIAN_BITFIELD
#define PKT_TYPE_MAX	(7 << 5)
#else
#define PKT_TYPE_MAX	7
#endif
#define PKT_TYPE_OFFSET()	offsetof(struct sk_buff, __pkt_type_offset)

/* private: */
	__u8			__pkt_type_offset[0];
	/* public: */
	__u8			pkt_type:3;
	__u8			ignore_df:1;
	__u8			nf_trace:1;
	__u8			ip_summed:2;
	__u8			ooo_okay:1;

__u8			l4_hash:1;
	__u8			sw_hash:1;
	__u8			wifi_acked_valid:1;
	__u8			wifi_acked:1;
	__u8			no_fcs:1;
	/* Indicates the inner headers are valid in the skbuff. */
	__u8			encapsulation:1;
	__u8			encap_hdr_csum:1;
	__u8			csum_valid:1;

#ifdef __BIG_ENDIAN_BITFIELD
#define PKT_VLAN_PRESENT_BIT	7
#else
#define PKT_VLAN_PRESENT_BIT	0
#endif
#define PKT_VLAN_PRESENT_OFFSET()	offsetof(struct sk_buff, __pkt_vlan_present_offset)
	/* private: */
	__u8			__pkt_vlan_present_offset[0];
	/* public: */
	__u8			vlan_present:1;
	__u8			csum_complete_sw:1;
	__u8			csum_level:2;
	__u8			csum_not_inet:1;
	__u8			dst_pending_confirm:1;
#ifdef CONFIG_IPV6_NDISC_NODETYPE
	__u8			ndisc_nodetype:2;
#endif

__u8			ipvs_property:1;
	__u8			inner_protocol_type:1;
	__u8			remcsum_offload:1;
#ifdef CONFIG_NET_SWITCHDEV
	__u8			offload_fwd_mark:1;
	__u8			offload_l3_fwd_mark:1;
#endif
#ifdef CONFIG_NET_CLS_ACT
	__u8			tc_skip_classify:1;
	__u8			tc_at_ingress:1;
#endif
	__u8			redirected:1;
#ifdef CONFIG_NET_REDIRECT
	__u8			from_ingress:1;
#endif
#ifdef CONFIG_TLS_DEVICE
	__u8			decrypted:1;
#endif
	__u8			slow_gro:1;
	__u8			scm_io_uring:1;

#ifdef CONFIG_NET_SCHED
	__u16			tc_index;	/* traffic control index */
#endif

union {
		__wsum		csum;
		struct {
			__u16	csum_start;
			__u16	csum_offset;
		};
	};
	__u32			priority;
	int			skb_iif;
	__u32			hash;
	__be16			vlan_proto;
	__u16			vlan_tci;
#if defined(CONFIG_NET_RX_BUSY_POLL) || defined(CONFIG_XPS)
	union {
		unsigned int	napi_id;
		unsigned int	sender_cpu;
	};
#endif
#ifdef CONFIG_NETWORK_SECMARK
	__u32		secmark;
#endif

union {
		__u32		mark;
		__u32		reserved_tailroom;
	};

union {
		__be16		inner_protocol;
		__u8		inner_ipproto;
	};

__u16			inner_transport_header;
	__u16			inner_network_header;
	__u16			inner_mac_header;

__be16			protocol;
	__u16			transport_header;
	__u16			network_header;
	__u16			mac_header;

#ifdef CONFIG_KCOV
	u64			kcov_handle;
#endif

/* private: */
	__u32			headers_end[0];
	/* public: */

/* These elements must be at the end, see alloc_skb() for details.  */
	sk_buff_data_t		tail;
	sk_buff_data_t		end;
	unsigned char		*head,
				*data;
	unsigned int		truesize;
	refcount_t		users;

#ifdef CONFIG_SKB_EXTENSIONS
	/* only useable after checking ->active_extensions != 0 */
	struct skb_ext		*extensions;
#endif
};

#ifdef __KERNEL__
/*
 *	Handling routines are only of interest to the kernel
 */

#define SKB_ALLOC_FCLONE	0x01
#define SKB_ALLOC_RX		0x02
#define SKB_ALLOC_NAPI		0x04

/**
 * skb_pfmemalloc - Test if the skb was allocated from PFMEMALLOC reserves
 * @skb: buffer
 */
static inline bool skb_pfmemalloc(const struct sk_buff *skb)
{
	return unlikely(skb->pfmemalloc);
}

/*
 * skb might have a dst pointer attached, refcounted or not.
 * _skb_refdst low order bit is set if refcount was _not_ taken
 */
#define SKB_DST_NOREF	1UL
#define SKB_DST_PTRMASK	~(SKB_DST_NOREF)

/**
 * skb_dst - returns skb dst_entry
 * @skb: buffer
 *
 * Returns skb dst_entry, regardless of reference taken or not.
 */
static inline struct dst_entry *skb_dst(const struct sk_buff *skb)
{
	/* If refdst was not refcounted, check we still are in a
	 * rcu_read_lock section
	 */
	WARN_ON((skb->_skb_refdst & SKB_DST_NOREF) &&
		!rcu_read_lock_held() &&
		!rcu_read_lock_bh_held());
	return (struct dst_entry *)(skb->_skb_refdst & SKB_DST_PTRMASK);
}

/**
 * skb_dst_set - sets skb dst
 * @skb: buffer
 * @dst: dst entry
 *
 * Sets skb dst, assuming a reference was taken on dst and should
 * be released by skb_dst_drop()
 */
static inline void skb_dst_set(struct sk_buff *skb, struct dst_entry *dst)
{
	skb->slow_gro |= !!dst;
	skb->_skb_refdst = (unsigned long)dst;
}

/**
 * skb_dst_set_noref - sets skb dst, hopefully, without taking reference
 * @skb: buffer
 * @dst: dst entry
 *
 * Sets skb dst, assuming a reference was not taken on dst.
 * If dst entry is cached, we do not take reference and dst_release
 * will be avoided by refdst_drop. If dst entry is not cached, we take
 * reference, so that last dst_release can destroy the dst immediately.
 */
static inline void skb_dst_set_noref(struct sk_buff *skb, struct dst_entry *dst)
{
	WARN_ON(!rcu_read_lock_held() && !rcu_read_lock_bh_held());
	skb->slow_gro |= !!dst;
	skb->_skb_refdst = (unsigned long)dst | SKB_DST_NOREF;
}

/**
 * skb_dst_is_noref - Test if skb dst isn't refcounted
 * @skb: buffer
 */
static inline bool skb_dst_is_noref(const struct sk_buff *skb)
{
	return (skb->_skb_refdst & SKB_DST_NOREF) && skb_dst(skb);
}

/**
 * skb_rtable - Returns the skb &rtable
 * @skb: buffer
 */
static inline struct rtable *skb_rtable(const struct sk_buff *skb)
{
	return (struct rtable *)skb_dst(skb);
}

/* For mangling skb->pkt_type from user space side from applications
 * such as nft, tc, etc, we only allow a conservative subset of
 * possible pkt_types to be set.
*/
static inline bool skb_pkt_type_ok(u32 ptype)
{
	return ptype <= PACKET_OTHERHOST;
}

/**
 * skb_napi_id - Returns the skb's NAPI id
 * @skb: buffer
 */
static inline unsigned int skb_napi_id(const struct sk_buff *skb)
{
#ifdef CONFIG_NET_RX_BUSY_POLL
	return skb->napi_id;
#else
	return 0;
#endif
}

/**
 * skb_unref - decrement the skb's reference count
 * @skb: buffer
 *
 * Returns true if we can free the skb.
 */
static inline bool skb_unref(struct sk_buff *skb)
{
	if (unlikely(!skb))
		return false;
	if (likely(refcount_read(&skb->users) == 1))
		smp_rmb();
	else if (likely(!refcount_dec_and_test(&skb->users)))
		return false;

return true;
}

void kfree_skb_reason(struct sk_buff *skb, enum skb_drop_reason reason);

/**
 *	kfree_skb - free an sk_buff with 'NOT_SPECIFIED' reason
 *	@skb: buffer to free
 */
static inline void kfree_skb(struct sk_buff *skb)
{
	kfree_skb_reason(skb, SKB_DROP_REASON_NOT_SPECIFIED);
}

void skb_release_head_state(struct sk_buff *skb);
void kfree_skb_list(struct sk_buff *segs);
void skb_dump(const char *level, const struct sk_buff *skb, bool full_pkt);
void skb_tx_error(struct sk_buff *skb);

#ifdef CONFIG_TRACEPOINTS
void consume_skb(struct sk_buff *skb);
#else
static inline void consume_skb(struct sk_buff *skb)
{
	return kfree_skb(skb);
}
#endif

void __consume_stateless_skb(struct sk_buff *skb);
void  __kfree_skb(struct sk_buff *skb);
extern struct kmem_cache *skbuff_head_cache;

void kfree_skb_partial(struct sk_buff *skb, bool head_stolen);
bool skb_try_coalesce(struct sk_buff *to, struct sk_buff *from,
		      bool *fragstolen, int *delta_truesize);

struct sk_buff *__alloc_skb(unsigned int size, gfp_t priority, int flags,
			    int node);
struct sk_buff *__build_skb(void *data, unsigned int frag_size);
struct sk_buff *build_skb(void *data, unsigned int frag_size);
struct sk_buff *build_skb_around(struct sk_buff *skb,
				 void *data, unsigned int frag_size);

struct sk_buff *napi_build_skb(void *data, unsigned int frag_size);

/**
 * alloc_skb - allocate a network buffer
 * @size: size to allocate
 * @priority: allocation mask
 *
 * This function is a convenient wrapper around __alloc_skb().
 */
static inline struct sk_buff *alloc_skb(unsigned int size,
					gfp_t priority)
{
	return __alloc_skb(size, priority, 0, NUMA_NO_NODE);
}

struct sk_buff *alloc_skb_with_frags(unsigned long header_len,
				     unsigned long data_len,
				     int max_page_order,
				     int *errcode,
				     gfp_t gfp_mask);
struct sk_buff *alloc_skb_for_msg(struct sk_buff *first);

/* Layout of fast clones : [skb1][skb2][fclone_ref] */
struct sk_buff_fclones {
	struct sk_buff	skb1;

struct sk_buff	skb2;

refcount_t	fclone_ref;
};

/**
 *	skb_fclone_busy - check if fclone is busy
 *	@sk: socket
 *	@skb: buffer
 *
 * Returns true if skb is a fast clone, and its clone is not freed.
 * Some drivers call skb_orphan() in their ndo_start_xmit(),
 * so we also check that this didnt happen.
 */
static inline bool skb_fclone_busy(const struct sock *sk,
				   const struct sk_buff *skb)
{
	const struct sk_buff_fclones *fclones;

fclones = container_of(skb, struct sk_buff_fclones, skb1);

return skb->fclone == SKB_FCLONE_ORIG &&
	       refcount_read(&fclones->fclone_ref) > 1 &&
	       READ_ONCE(fclones->skb2.sk) == sk;
}

/**
 * alloc_skb_fclone - allocate a network buffer from fclone cache
 * @size: size to allocate
 * @priority: allocation mask
 *
 * This function is a convenient wrapper around __alloc_skb().
 */
static inline struct sk_buff *alloc_skb_fclone(unsigned int size,
					       gfp_t priority)
{
	return __alloc_skb(size, priority, SKB_ALLOC_FCLONE, NUMA_NO_NODE);
}

struct sk_buff *skb_morph(struct sk_buff *dst, struct sk_buff *src);
void skb_headers_offset_update(struct sk_buff *skb, int off);
int skb_copy_ubufs(struct sk_buff *skb, gfp_t gfp_mask);
struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t priority);
void skb_copy_header(struct sk_buff *new, const struct sk_buff *old);
struct sk_buff *skb_copy(const struct sk_buff *skb, gfp_t priority);
struct sk_buff *__pskb_copy_fclone(struct sk_buff *skb, int headroom,
				   gfp_t gfp_mask, bool fclone);
static inline struct sk_buff *__pskb_copy(struct sk_buff *skb, int headroom,
					  gfp_t gfp_mask)
{
	return __pskb_copy_fclone(skb, headroom, gfp_mask, false);
}

int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail, gfp_t gfp_mask);
struct sk_buff *skb_realloc_headroom(struct sk_buff *skb,
				     unsigned int headroom);
struct sk_buff *skb_expand_head(struct sk_buff *skb, unsigned int headroom);
struct sk_buff *skb_copy_expand(const struct sk_buff *skb, int newheadroom,
				int newtailroom, gfp_t priority);
int __must_check skb_to_sgvec_nomark(struct sk_buff *skb, struct scatterlist *sg,
				     int offset, int len);
int __must_check skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg,
			      int offset, int len);
int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer);
int __skb_pad(struct sk_buff *skb, int pad, bool free_on_error);

/**
 *	skb_pad			-	zero pad the tail of an skb
 *	@skb: buffer to pad
 *	@pad: space to pad
 *
 *	Ensure that a buffer is followed by a padding area that is zero
 *	filled. Used by network drivers which may DMA or transfer data
 *	beyond the buffer end onto the wire.
 *
 *	May return error in out of memory cases. The skb is freed on error.
 */
static inline int skb_pad(struct sk_buff *skb, int pad)
{
	return __skb_pad(skb, pad, true);
}
#define dev_kfree_skb(a)	consume_skb(a)

int skb_append_pagefrags(struct sk_buff *skb, struct page *page,
			 int offset, size_t size);

struct skb_seq_state {
	__u32		lower_offset;
	__u32		upper_offset;
	__u32		frag_idx;
	__u32		stepped_offset;
	struct sk_buff	*root_skb;
	struct sk_buff	*cur_skb;
	__u8		*frag_data;
	__u32		frag_off;
};

void skb_prepare_seq_read(struct sk_buff *skb, unsigned int from,
			  unsigned int to, struct skb_seq_state *st);
unsigned int skb_seq_read(unsigned int consumed, const u8 **data,
			  struct skb_seq_state *st);
void skb_abort_seq_read(struct skb_seq_state *st);

unsigned int skb_find_text(struct sk_buff *skb, unsigned int from,
			   unsigned int to, struct ts_config *config);

/*
 * Packet hash types specify the type of hash in skb_set_hash.
 *
 * Hash types refer to the protocol layer addresses which are used to
 * construct a packet's hash. The hashes are used to differentiate or identify
 * flows of the protocol layer for the hash type. Hash types are either
 * layer-2 (L2), layer-3 (L3), or layer-4 (L4).
 *
 * Properties of hashes:
 *
 * 1) Two packets in different flows have different hash values
 * 2) Two packets in the same flow should have the same hash value
 *
 * A hash at a higher layer is considered to be more specific. A driver should
 * set the most specific hash possible.
 *
 * A driver cannot indicate a more specific hash than the layer at which a hash
 * was computed. For instance an L3 hash cannot be set as an L4 hash.
 *
 * A driver may indicate a hash level which is less specific than the
 * actual layer the hash was computed on. For instance, a hash computed
 * at L4 may be considered an L3 hash. This should only be done if the
 * driver can't unambiguously determine that the HW computed the hash at
 * the higher layer. Note that the "should" in the second property above
 * permits this.
 */
enum pkt_hash_types {
	PKT_HASH_TYPE_NONE,	/* Undefined type */
	PKT_HASH_TYPE_L2,	/* Input: src_MAC, dest_MAC */
	PKT_HASH_TYPE_L3,	/* Input: src_IP, dst_IP */
	PKT_HASH_TYPE_L4,	/* Input: src_IP, dst_IP, src_port, dst_port */
};

static inline void skb_clear_hash(struct sk_buff *skb)
{
	skb->hash = 0;
	skb->sw_hash = 0;
	skb->l4_hash = 0;
}

static inline void skb_clear_hash_if_not_l4(struct sk_buff *skb)
{
	if (!skb->l4_hash)
		skb_clear_hash(skb);
}

static inline void
__skb_set_hash(struct sk_buff *skb, __u32 hash, bool is_sw, bool is_l4)
{
	skb->l4_hash = is_l4;
	skb->sw_hash = is_sw;
	skb->hash = hash;
}

static inline void
skb_set_hash(struct sk_buff *skb, __u32 hash, enum pkt_hash_types type)
{
	/* Used by drivers to set hash from HW */
	__skb_set_hash(skb, hash, false, type == PKT_HASH_TYPE_L4);
}

static inline void
__skb_set_sw_hash(struct sk_buff *skb, __u32 hash, bool is_l4)
{
	__skb_set_hash(skb, hash, true, is_l4);
}

void __skb_get_hash(struct sk_buff *skb);
u32 __skb_get_hash_symmetric(const struct sk_buff *skb);
u32 skb_get_poff(const struct sk_buff *skb);
u32 __skb_get_poff(const struct sk_buff *skb, const void *data,
		   const struct flow_keys_basic *keys, int hlen);
__be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
			    const void *data, int hlen_proto);

static inline __be32 skb_flow_get_ports(const struct sk_buff *skb,
					int thoff, u8 ip_proto)
{
	return __skb_flow_get_ports(skb, thoff, ip_proto, NULL, 0);
}

void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
			     const struct flow_dissector_key *key,
			     unsigned int key_count);

struct bpf_flow_dissector;
bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
		      __be16 proto, int nhoff, int hlen, unsigned int flags);

bool __skb_flow_dissect(const struct net *net,
			const struct sk_buff *skb,
			struct flow_dissector *flow_dissector,
			void *target_container, const void *data,
			__be16 proto, int nhoff, int hlen, unsigned int flags);

static inline bool skb_flow_dissect(const struct sk_buff *skb,
				    struct flow_dissector *flow_dissector,
				    void *target_container, unsigned int flags)
{
	return __skb_flow_dissect(NULL, skb, flow_dissector,
				  target_container, NULL, 0, 0, 0, flags);
}

static inline bool skb_flow_dissect_flow_keys(const struct sk_buff *skb,
					      struct flow_keys *flow,
					      unsigned int flags)
{
	memset(flow, 0, sizeof(*flow));
	return __skb_flow_dissect(NULL, skb, &flow_keys_dissector,
				  flow, NULL, 0, 0, 0, flags);
}

static inline bool
skb_flow_dissect_flow_keys_basic(const struct net *net,
				 const struct sk_buff *skb,
				 struct flow_keys_basic *flow,
				 const void *data, __be16 proto,
				 int nhoff, int hlen, unsigned int flags)
{
	memset(flow, 0, sizeof(*flow));
	return __skb_flow_dissect(net, skb, &flow_keys_basic_dissector, flow,
				  data, proto, nhoff, hlen, flags);
}

void skb_flow_dissect_meta(const struct sk_buff *skb,
			   struct flow_dissector *flow_dissector,
			   void *target_container);

/* Gets a skb connection tracking info, ctinfo map should be a
 * map of mapsize to translate enum ip_conntrack_info states
 * to user states.
 */
void
skb_flow_dissect_ct(const struct sk_buff *skb,
		    struct flow_dissector *flow_dissector,
		    void *target_container,
		    u16 *ctinfo_map, size_t mapsize,
		    bool post_ct, u16 zone);
void
skb_flow_dissect_tunnel_info(const struct sk_buff *skb,
			     struct flow_dissector *flow_dissector,
			     void *target_container);

void skb_flow_dissect_hash(const struct sk_buff *skb,
			   struct flow_dissector *flow_dissector,
			   void *target_container);

static inline __u32 skb_get_hash(struct sk_buff *skb)
{
	if (!skb->l4_hash && !skb->sw_hash)
		__skb_get_hash(skb);

return skb->hash;
}

static inline __u32 skb_get_hash_flowi6(struct sk_buff *skb, const struct flowi6 *fl6)
{
	if (!skb->l4_hash && !skb->sw_hash) {
		struct flow_keys keys;
		__u32 hash = __get_hash_from_flowi6(fl6, &keys);

__skb_set_sw_hash(skb, hash, flow_keys_have_l4(&keys));
	}

return skb->hash;
}

__u32 skb_get_hash_perturb(const struct sk_buff *skb,
			   const siphash_key_t *perturb);

static inline __u32 skb_get_hash_raw(const struct sk_buff *skb)
{
	return skb->hash;
}

static inline void skb_copy_hash(struct sk_buff *to, const struct sk_buff *from)
{
	to->hash = from->hash;
	to->sw_hash = from->sw_hash;
	to->l4_hash = from->l4_hash;
};

static inline void skb_copy_decrypted(struct sk_buff *to,
				      const struct sk_buff *from)
{
#ifdef CONFIG_TLS_DEVICE
	to->decrypted = from->decrypted;
#endif
}

#ifdef NET_SKBUFF_DATA_USES_OFFSET
static inline unsigned char *skb_end_pointer(const struct sk_buff *skb)
{
	return skb->head + skb->end;
}

static inline unsigned int skb_end_offset(const struct sk_buff *skb)
{
	return skb->end;
}

static inline void skb_set_end_offset(struct sk_buff *skb, unsigned int offset)
{
	skb->end = offset;
}
#else
static inline unsigned char *skb_end_pointer(const struct sk_buff *skb)
{
	return skb->end;
}

static inline unsigned int skb_end_offset(const struct sk_buff *skb)
{
	return skb->end - skb->head;
}

static inline void skb_set_end_offset(struct sk_buff *skb, unsigned int offset)
{
	skb->end = skb->head + offset;
}
#endif

/* Internal */
#define skb_shinfo(SKB)	((struct skb_shared_info *)(skb_end_pointer(SKB)))

static inline struct skb_shared_hwtstamps *skb_hwtstamps(struct sk_buff *skb)
{
	return &skb_shinfo(skb)->hwtstamps;
}

static inline struct ubuf_info *skb_zcopy(struct sk_buff *skb)
{
	bool is_zcopy = skb && skb_shinfo(skb)->flags & SKBFL_ZEROCOPY_ENABLE;

return is_zcopy ? skb_uarg(skb) : NULL;
}

static inline void net_zcopy_get(struct ubuf_info *uarg)
{
	refcount_inc(&uarg->refcnt);
}

static inline void skb_zcopy_init(struct sk_buff *skb, struct ubuf_info *uarg)
{
	skb_shinfo(skb)->destructor_arg = uarg;
	skb_shinfo(skb)->flags |= uarg->flags;
}

static inline void skb_zcopy_set(struct sk_buff *skb, struct ubuf_info *uarg,
				 bool *have_ref)
{
	if (skb && uarg && !skb_zcopy(skb)) {
		if (unlikely(have_ref && *have_ref))
			*have_ref = false;
		else
			net_zcopy_get(uarg);
		skb_zcopy_init(skb, uarg);
	}
}

static inline void skb_zcopy_set_nouarg(struct sk_buff *skb, void *val)
{
	skb_shinfo(skb)->destructor_arg = (void *)((uintptr_t) val | 0x1UL);
	skb_shinfo(skb)->flags |= SKBFL_ZEROCOPY_FRAG;
}

static inline bool skb_zcopy_is_nouarg(struct sk_buff *skb)
{
	return (uintptr_t) skb_shinfo(skb)->destructor_arg & 0x1UL;
}

static inline void *skb_zcopy_get_nouarg(struct sk_buff *skb)
{
	return (void *)((uintptr_t) skb_shinfo(skb)->destructor_arg & ~0x1UL);
}

static inline void net_zcopy_put(struct ubuf_info *uarg)
{
	if (uarg)
		uarg->callback(NULL, uarg, true);
}

static inline void net_zcopy_put_abort(struct ubuf_info *uarg, bool have_uref)
{
	if (uarg) {
		if (uarg->callback == msg_zerocopy_callback)
			msg_zerocopy_put_abort(uarg, have_uref);
		else if (have_uref)
			net_zcopy_put(uarg);
	}
}

/* Release a reference on a zerocopy structure */
static inline void skb_zcopy_clear(struct sk_buff *skb, bool zerocopy_success)
{
	struct ubuf_info *uarg = skb_zcopy(skb);

if (uarg) {
		if (!skb_zcopy_is_nouarg(skb))
			uarg->callback(skb, uarg, zerocopy_success);

skb_shinfo(skb)->flags &= ~SKBFL_ZEROCOPY_FRAG;
	}
}

static inline void skb_mark_not_on_list(struct sk_buff *skb)
{
	skb->next = NULL;
}

/* Iterate through singly-linked GSO fragments of an skb. */
#define skb_list_walk_safe(first, skb, next_skb)                               \
	for ((skb) = (first), (next_skb) = (skb) ? (skb)->next : NULL; (skb);  \
	     (skb) = (next_skb), (next_skb) = (skb) ? (skb)->next : NULL)

static inline void skb_list_del_init(struct sk_buff *skb)
{
	__list_del_entry(&skb->list);
	skb_mark_not_on_list(skb);
}

/**
 *	skb_queue_empty - check if a queue is empty
 *	@list: queue head
 *
 *	Returns true if the queue is empty, false otherwise.
 */
static inline int skb_queue_empty(const struct sk_buff_head *list)
{
	return list->next == (const struct sk_buff *) list;
}

/**
 *	skb_queue_empty_lockless - check if a queue is empty
 *	@list: queue head
 *
 *	Returns true if the queue is empty, false otherwise.
 *	This variant can be used in lockless contexts.
 */
static inline bool skb_queue_empty_lockless(const struct sk_buff_head *list)
{
	return READ_ONCE(list->next) == (const struct sk_buff *) list;
}

/**
 *	skb_queue_is_last - check if skb is the last entry in the queue
 *	@list: queue head
 *	@skb: buffer
 *
 *	Returns true if @skb is the last buffer on the list.
 */
static inline bool skb_queue_is_last(const struct sk_buff_head *list,
				     const struct sk_buff *skb)
{
	return skb->next == (const struct sk_buff *) list;
}

/**
 *	skb_queue_is_first - check if skb is the first entry in the queue
 *	@list: queue head
 *	@skb: buffer
 *
 *	Returns true if @skb is the first buffer on the list.
 */
static inline bool skb_queue_is_first(const struct sk_buff_head *list,
				      const struct sk_buff *skb)
{
	return skb->prev == (const struct sk_buff *) list;
}

/**
 *	skb_queue_next - return the next packet in the queue
 *	@list: queue head
 *	@skb: current buffer
 *
 *	Return the next packet in @list after @skb.  It is only valid to
 *	call this if skb_queue_is_last() evaluates to false.
 */
static inline struct sk_buff *skb_queue_next(const struct sk_buff_head *list,
					     const struct sk_buff *skb)
{
	/* This BUG_ON may seem severe, but if we just return then we
	 * are going to dereference garbage.
	 */
	BUG_ON(skb_queue_is_last(list, skb));
	return skb->next;
}

/**
 *	skb_queue_prev - return the prev packet in the queue
 *	@list: queue head
 *	@skb: current buffer
 *
 *	Return the prev packet in @list before @skb.  It is only valid to
 *	call this if skb_queue_is_first() evaluates to false.
 */
static inline struct sk_buff *skb_queue_prev(const struct sk_buff_head *list,
					     const struct sk_buff *skb)
{
	/* This BUG_ON may seem severe, but if we just return then we
	 * are going to dereference garbage.
	 */
	BUG_ON(skb_queue_is_first(list, skb));
	return skb->prev;
}

/**
 *	skb_get - reference buffer
 *	@skb: buffer to reference
 *
 *	Makes another reference to a socket buffer and returns a pointer
 *	to the buffer.
 */
static inline struct sk_buff *skb_get(struct sk_buff *skb)
{
	refcount_inc(&skb->users);
	return skb;
}

/*
 * If users == 1, we are the only owner and can avoid redundant atomic changes.
 */

/**
 *	skb_cloned - is the buffer a clone
 *	@skb: buffer to check
 *
 *	Returns true if the buffer was generated with skb_clone() and is
 *	one of multiple shared copies of the buffer. Cloned buffers are
 *	shared data so must not be written to under normal circumstances.
 */
static inline int skb_cloned(const struct sk_buff *skb)
{
	return skb->cloned &&
	       (atomic_read(&skb_shinfo(skb)->dataref) & SKB_DATAREF_MASK) != 1;
}

static inline int skb_unclone(struct sk_buff *skb, gfp_t pri)
{
	might_sleep_if(gfpflags_allow_blocking(pri));

if (skb_cloned(skb))
		return pskb_expand_head(skb, 0, 0, pri);

return 0;
}

/* This variant of skb_unclone() makes sure skb->truesize
 * and skb_end_offset() are not changed, whenever a new skb->head is needed.
 *
 * Indeed there is no guarantee that ksize(kmalloc(X)) == ksize(kmalloc(X))
 * when various debugging features are in place.
 */
int __skb_unclone_keeptruesize(struct sk_buff *skb, gfp_t pri);
static inline int skb_unclone_keeptruesize(struct sk_buff *skb, gfp_t pri)
{
	might_sleep_if(gfpflags_allow_blocking(pri));

if (skb_cloned(skb))
		return __skb_unclone_keeptruesize(skb, pri);
	return 0;
}

/**
 *	skb_header_cloned - is the header a clone
 *	@skb: buffer to check
 *
 *	Returns true if modifying the header part of the buffer requires
 *	the data to be copied.
 */
static inline int skb_header_cloned(const struct sk_buff *skb)
{
	int dataref;

if (!skb->cloned)
		return 0;

dataref = atomic_read(&skb_shinfo(skb)->dataref);
	dataref = (dataref & SKB_DATAREF_MASK) - (dataref >> SKB_DATAREF_SHIFT);
	return dataref != 1;
}

static inline int skb_header_unclone(struct sk_buff *skb, gfp_t pri)
{
	might_sleep_if(gfpflags_allow_blocking(pri));

if (skb_header_cloned(skb))
		return pskb_expand_head(skb, 0, 0, pri);

return 0;
}

/**
 *	__skb_header_release - release reference to header
 *	@skb: buffer to operate on
 */
static inline void __skb_header_release(struct sk_buff *skb)
{
	skb->nohdr = 1;
	atomic_set(&skb_shinfo(skb)->dataref, 1 + (1 << SKB_DATAREF_SHIFT));
}

/**
 *	skb_shared - is the buffer shared
 *	@skb: buffer to check
 *
 *	Returns true if more than one person has a reference to this
 *	buffer.
 */
static inline int skb_shared(const struct sk_buff *skb)
{
	return refcount_read(&skb->users) != 1;
}

/**
 *	skb_share_check - check if buffer is shared and if so clone it
 *	@skb: buffer to check
 *	@pri: priority for memory allocation
 *
 *	If the buffer is shared the buffer is cloned and the old copy
 *	drops a reference. A new clone with a single reference is returned.
 *	If the buffer is not shared the original buffer is returned. When
 *	being called from interrupt status or with spinlocks held pri must
 *	be GFP_ATOMIC.
 *
 *	NULL is returned on a memory allocation failure.
 */
static inline struct sk_buff *skb_share_check(struct sk_buff *skb, gfp_t pri)
{
	might_sleep_if(gfpflags_allow_blocking(pri));
	if (skb_shared(skb)) {
		struct sk_buff *nskb = skb_clone(skb, pri);

if (likely(nskb))
			consume_skb(skb);
		else
			kfree_skb(skb);
		skb = nskb;
	}
	return skb;
}

/*
 *	Copy shared buffers into a new sk_buff. We effectively do COW on
 *	packets to handle cases where we have a local reader and forward
 *	and a couple of other messy ones. The normal one is tcpdumping
 *	a packet thats being forwarded.
 */

/**
 *	skb_unshare - make a copy of a shared buffer
 *	@skb: buffer to check
 *	@pri: priority for memory allocation
 *
 *	If the socket buffer is a clone then this function creates a new
 *	copy of the data, drops a reference count on the old copy and returns
 *	the new copy with the reference count at 1. If the buffer is not a clone
 *	the original buffer is returned. When called with a spinlock held or
 *	from interrupt state @pri must be %GFP_ATOMIC
 *
 *	%NULL is returned on a memory allocation failure.
 */
static inline struct sk_buff *skb_unshare(struct sk_buff *skb,
					  gfp_t pri)
{
	might_sleep_if(gfpflags_allow_blocking(pri));
	if (skb_cloned(skb)) {
		struct sk_buff *nskb = skb_copy(skb, pri);

/* Free our shared copy */
		if (likely(nskb))
			consume_skb(skb);
		else
			kfree_skb(skb);
		skb = nskb;
	}
	return skb;
}

/**
 *	skb_peek - peek at the head of an &sk_buff_head
 *	@list_: list to peek at
 *
 *	Peek an &sk_buff. Unlike most other operations you _MUST_
 *	be careful with this one. A peek leaves the buffer on the
 *	list and someone else may run off with it. You must hold
 *	the appropriate locks or have a private queue to do this.
 *
 *	Returns %NULL for an empty list or a pointer to the head element.
 *	The reference count is not incremented and the reference is therefore
 *	volatile. Use with caution.
 */
static inline struct sk_buff *skb_peek(const struct sk_buff_head *list_)
{
	struct sk_buff *skb = list_->next;

if (skb == (struct sk_buff *)list_)
		skb = NULL;
	return skb;
}

/**
 *	__skb_peek - peek at the head of a non-empty &sk_buff_head
 *	@list_: list to peek at
 *
 *	Like skb_peek(), but the caller knows that the list is not empty.
 */
static inline struct sk_buff *__skb_peek(const struct sk_buff_head *list_)
{
	return list_->next;
}

/**
 *	skb_peek_next - peek skb following the given one from a queue
 *	@skb: skb to start from
 *	@list_: list to peek at
 *
 *	Returns %NULL when the end of the list is met or a pointer to the
 *	next element. The reference count is not incremented and the
 *	reference is therefore volatile. Use with caution.
 */
static inline struct sk_buff *skb_peek_next(struct sk_buff *skb,
		const struct sk_buff_head *list_)
{
	struct sk_buff *next = skb->next;

if (next == (struct sk_buff *)list_)
		next = NULL;
	return next;
}

/**
 *	skb_peek_tail - peek at the tail of an &sk_buff_head
 *	@list_: list to peek at
 *
 *	Peek an &sk_buff. Unlike most other operations you _MUST_
 *	be careful with this one. A peek leaves the buffer on the
 *	list and someone else may run off with it. You must hold
 *	the appropriate locks or have a private queue to do this.
 *
 *	Returns %NULL for an empty list or a pointer to the tail element.
 *	The reference count is not incremented and the reference is therefore
 *	volatile. Use with caution.
 */
static inline struct sk_buff *skb_peek_tail(const struct sk_buff_head *list_)
{
	struct sk_buff *skb = READ_ONCE(list_->prev);

if (skb == (struct sk_buff *)list_)
		skb = NULL;
	return skb;

}

/**
 *	skb_queue_len	- get queue length
 *	@list_: list to measure
 *
 *	Return the length of an &sk_buff queue.
 */
static inline __u32 skb_queue_len(const struct sk_buff_head *list_)
{
	return list_->qlen;
}

/**
 *	skb_queue_len_lockless	- get queue length
 *	@list_: list to measure
 *
 *	Return the length of an &sk_buff queue.
 *	This variant can be used in lockless contexts.
 */
static inline __u32 skb_queue_len_lockless(const struct sk_buff_head *list_)
{
	return READ_ONCE(list_->qlen);
}

/**
 *	__skb_queue_head_init - initialize non-spinlock portions of sk_buff_head
 *	@list: queue to initialize
 *
 *	This initializes only the list and queue length aspects of
 *	an sk_buff_head object.  This allows to initialize the list
 *	aspects of an sk_buff_head without reinitializing things like
 *	the spinlock.  It can also be used for on-stack sk_buff_head
 *	objects where the spinlock is known to not be used.
 */
static inline void __skb_queue_head_init(struct sk_buff_head *list)
{
	list->prev = list->next = (struct sk_buff *)list;
	list->qlen = 0;
}

/*
 * This function creates a split out lock class for each invocation;
 * this is needed for now since a whole lot of users of the skb-queue
 * infrastructure in drivers have different locking usage (in hardirq)
 * than the networking core (in softirq only). In the long run either the
 * network layer or drivers should need annotation to consolidate the
 * main types of usage into 3 classes.
 */
static inline void skb_queue_head_init(struct sk_buff_head *list)
{
	spin_lock_init(&list->lock);
	__skb_queue_head_init(list);
}

static inline void skb_queue_head_init_class(struct sk_buff_head *list,
		struct lock_class_key *class)
{
	skb_queue_head_init(list);
	lockdep_set_class(&list->lock, class);
}

/*
 *	Insert an sk_buff on a list.
 *
 *	The "__skb_xxxx()" functions are the non-atomic ones that
 *	can only be called with interrupts disabled.
 */
static inline void __skb_insert(struct sk_buff *newsk,
				struct sk_buff *prev, struct sk_buff *next,
				struct sk_buff_head *list)
{
	/* See skb_queue_empty_lockless() and skb_peek_tail()
	 * for the opposite READ_ONCE()
	 */
	WRITE_ONCE(newsk->next, next);
	WRITE_ONCE(newsk->prev, prev);
	WRITE_ONCE(next->prev, newsk);
	WRITE_ONCE(prev->next, newsk);
	WRITE_ONCE(list->qlen, list->qlen + 1);
}

static inline void __skb_queue_splice(const struct sk_buff_head *list,
				      struct sk_buff *prev,
				      struct sk_buff *next)
{
	struct sk_buff *first = list->next;
	struct sk_buff *last = list->prev;

WRITE_ONCE(first->prev, prev);
	WRITE_ONCE(prev->next, first);

WRITE_ONCE(last->next, next);
	WRITE_ONCE(next->prev, last);
}

/**
 *	skb_queue_splice - join two skb lists, this is designed for stacks
 *	@list: the new list to add
 *	@head: the place to add it in the first list
 */
static inline void skb_queue_splice(const struct sk_buff_head *list,
				    struct sk_buff_head *head)
{
	if (!skb_queue_empty(list)) {
		__skb_queue_splice(list, (struct sk_buff *) head, head->next);
		head->qlen += list->qlen;
	}
}

/**
 *	skb_queue_splice_init - join two skb lists and reinitialise the emptied list
 *	@list: the new list to add
 *	@head: the place to add it in the first list
 *
 *	The list at @list is reinitialised
 */
static inline void skb_queue_splice_init(struct sk_buff_head *list,
					 struct sk_buff_head *head)
{
	if (!skb_queue_empty(list)) {
		__skb_queue_splice(list, (struct sk_buff *) head, head->next);
		head->qlen += list->qlen;
		__skb_queue_head_init(list);
	}
}

/**
 *	skb_queue_splice_tail - join two skb lists, each list being a queue
 *	@list: the new list to add
 *	@head: the place to add it in the first list
 */
static inline void skb_queue_splice_tail(const struct sk_buff_head *list,
					 struct sk_buff_head *head)
{
	if (!skb_queue_empty(list)) {
		__skb_queue_splice(list, head->prev, (struct sk_buff *) head);
		head->qlen += list->qlen;
	}
}

/**
 *	skb_queue_splice_tail_init - join two skb lists and reinitialise the emptied list
 *	@list: the new list to add
 *	@head: the place to add it in the first list
 *
 *	Each of the lists is a queue.
 *	The list at @list is reinitialised
 */
static inline void skb_queue_splice_tail_init(struct sk_buff_head *list,
					      struct sk_buff_head *head)
{
	if (!skb_queue_empty(list)) {
		__skb_queue_splice(list, head->prev, (struct sk_buff *) head);
		head->qlen += list->qlen;
		__skb_queue_head_init(list);
	}
}

/**
 *	__skb_queue_after - queue a buffer at the list head
 *	@list: list to use
 *	@prev: place after this buffer
 *	@newsk: buffer to queue
 *
 *	Queue a buffer int the middle of a list. This function takes no locks
 *	and you must therefore hold required locks before calling it.
 *
 *	A buffer cannot be placed on two lists at the same time.
 */
static inline void __skb_queue_after(struct sk_buff_head *list,
				     struct sk_buff *prev,
				     struct sk_buff *newsk)
{
	__skb_insert(newsk, prev, prev->next, list);
}

void skb_append(struct sk_buff *old, struct sk_buff *newsk,
		struct sk_buff_head *list);

static inline void __skb_queue_before(struct sk_buff_head *list,
				      struct sk_buff *next,
				      struct sk_buff *newsk)
{
	__skb_insert(newsk, next->prev, next, list);
}

/**
 *	__skb_queue_head - queue a buffer at the list head
 *	@list: list to use
 *	@newsk: buffer to queue
 *
 *	Queue a buffer at the start of a list. This function takes no locks
 *	and you must therefore hold required locks before calling it.
 *
 *	A buffer cannot be placed on two lists at the same time.
 */
static inline void __skb_queue_head(struct sk_buff_head *list,
				    struct sk_buff *newsk)
{
	__skb_queue_after(list, (struct sk_buff *)list, newsk);
}
void skb_queue_head(struct sk_buff_head *list, struct sk_buff *newsk);

/**
 *	__skb_queue_tail - queue a buffer at the list tail
 *	@list: list to use
 *	@newsk: buffer to queue
 *
 *	Queue a buffer at the end of a list. This function takes no locks
 *	and you must therefore hold required locks before calling it.
 *
 *	A buffer cannot be placed on two lists at the same time.
 */
static inline void __skb_queue_tail(struct sk_buff_head *list,
				   struct sk_buff *newsk)
{
	__skb_queue_before(list, (struct sk_buff *)list, newsk);
}
void skb_queue_tail(struct sk_buff_head *list, struct sk_buff *newsk);

/*
 * remove sk_buff from list. _Must_ be called atomically, and with
 * the list known..
 */
void skb_unlink(struct sk_buff *skb, struct sk_buff_head *list);
static inline void __skb_unlink(struct sk_buff *skb, struct sk_buff_head *list)
{
	struct sk_buff *next, *prev;

WRITE_ONCE(list->qlen, list->qlen - 1);
	next	   = skb->next;
	prev	   = skb->prev;
	skb->next  = skb->prev = NULL;
	WRITE_ONCE(next->prev, prev);
	WRITE_ONCE(prev->next, next);
}

/**
 *	__skb_dequeue - remove from the head of the queue
 *	@list: list to dequeue from
 *
 *	Remove the head of the list. This function does not take any locks
 *	so must be used with appropriate locks held only. The head item is
 *	returned or %NULL if the list is empty.
 */
static inline struct sk_buff *__skb_dequeue(struct sk_buff_head *list)
{
	struct sk_buff *skb = skb_peek(list);
	if (skb)
		__skb_unlink(skb, list);
	return skb;
}
struct sk_buff *skb_dequeue(struct sk_buff_head *list);

/**
 *	__skb_dequeue_tail - remove from the tail of the queue
 *	@list: list to dequeue from
 *
 *	Remove the tail of the list. This function does not take any locks
 *	so must be used with appropriate locks held only. The tail item is
 *	returned or %NULL if the list is empty.
 */
static inline struct sk_buff *__skb_dequeue_tail(struct sk_buff_head *list)
{
	struct sk_buff *skb = skb_peek_tail(list);
	if (skb)
		__skb_unlink(skb, list);
	return skb;
}
struct sk_buff *skb_dequeue_tail(struct sk_buff_head *list);

static inline bool skb_is_nonlinear(const struct sk_buff *skb)
{
	return skb->data_len;
}

static inline unsigned int skb_headlen(const struct sk_buff *skb)
{
	return skb->len - skb->data_len;
}

static inline unsigned int __skb_pagelen(const struct sk_buff *skb)
{
	unsigned int i, len = 0;

for (i = skb_shinfo(skb)->nr_frags - 1; (int)i >= 0; i--)
		len += skb_frag_size(&skb_shinfo(skb)->frags[i]);
	return len;
}

static inline unsigned int skb_pagelen(const struct sk_buff *skb)
{
	return skb_headlen(skb) + __skb_pagelen(skb);
}

static inline void __skb_fill_page_desc_noacc(struct skb_shared_info *shinfo,
					      int i, struct page *page,
					      int off, int size)
{
	skb_frag_t *frag = &shinfo->frags[i];

/*
	 * Propagate page pfmemalloc to the skb if we can. The problem is
	 * that not all callers have unique ownership of the page but rely
	 * on page_is_pfmemalloc doing the right thing(tm).
	 */
	frag->bv_page		  = page;
	frag->bv_offset		  = off;
	skb_frag_size_set(frag, size);
}

/**
 * __skb_fill_page_desc - initialise a paged fragment in an skb
 * @skb: buffer containing fragment to be initialised
 * @i: paged fragment index to initialise
 * @page: the page to use for this fragment
 * @off: the offset to the data with @page
 * @size: the length of the data
 *
 * Initialises the @i'th fragment of @skb to point to &size bytes at
 * offset @off within @page.
 *
 * Does not take any additional reference on the fragment.
 */
static inline void __skb_fill_page_desc(struct sk_buff *skb, int i,
					struct page *page, int off, int size)
{
	__skb_fill_page_desc_noacc(skb_shinfo(skb), i, page, off, size);
	page = compound_head(page);
	if (page_is_pfmemalloc(page))
		skb->pfmemalloc	= true;
}

/**
 * skb_fill_page_desc - initialise a paged fragment in an skb
 * @skb: buffer containing fragment to be initialised
 * @i: paged fragment index to initialise
 * @page: the page to use for this fragment
 * @off: the offset to the data with @page
 * @size: the length of the data
 *
 * As per __skb_fill_page_desc() -- initialises the @i'th fragment of
 * @skb to point to @size bytes at offset @off within @page. In
 * addition updates @skb such that @i is the last fragment.
 *
 * Does not take any additional reference on the fragment.
 */
static inline void skb_fill_page_desc(struct sk_buff *skb, int i,
				      struct page *page, int off, int size)
{
	__skb_fill_page_desc(skb, i, page, off, size);
	skb_shinfo(skb)->nr_frags = i + 1;
}

/**
 * skb_fill_page_desc_noacc - initialise a paged fragment in an skb
 * @skb: buffer containing fragment to be initialised
 * @i: paged fragment index to initialise
 * @page: the page to use for this fragment
 * @off: the offset to the data with @page
 * @size: the length of the data
 *
 * Variant of skb_fill_page_desc() which does not deal with
 * pfmemalloc, if page is not owned by us.
 */
static inline void skb_fill_page_desc_noacc(struct sk_buff *skb, int i,
					    struct page *page, int off,
					    int size)
{
	struct skb_shared_info *shinfo = skb_shinfo(skb);

__skb_fill_page_desc_noacc(shinfo, i, page, off, size);
	shinfo->nr_frags = i + 1;
}

void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off,
		     int size, unsigned int truesize);

void skb_coalesce_rx_frag(struct sk_buff *skb, int i, int size,
			  unsigned int truesize);

#define SKB_LINEAR_ASSERT(skb)  BUG_ON(skb_is_nonlinear(skb))

#ifdef NET_SKBUFF_DATA_USES_OFFSET
static inline unsigned char *skb_tail_pointer(const struct sk_buff *skb)
{
	return skb->head + skb->tail;
}

static inline void skb_reset_tail_pointer(struct sk_buff *skb)
{
	skb->tail = skb->data - skb->head;
}

static inline void skb_set_tail_pointer(struct sk_buff *skb, const int offset)
{
	skb_reset_tail_pointer(skb);
	skb->tail += offset;
}

#else /* NET_SKBUFF_DATA_USES_OFFSET */
static inline unsigned char *skb_tail_pointer(const struct sk_buff *skb)
{
	return skb->tail;
}

static inline void skb_reset_tail_pointer(struct sk_buff *skb)
{
	skb->tail = skb->data;
}

static inline void skb_set_tail_pointer(struct sk_buff *skb, const int offset)
{
	skb->tail = skb->data + offset;
}

#endif /* NET_SKBUFF_DATA_USES_OFFSET */

static inline void skb_assert_len(struct sk_buff *skb)
{
#ifdef CONFIG_DEBUG_NET
	if (WARN_ONCE(!skb->len, "%s\n", __func__))
		DO_ONCE_LITE(skb_dump, KERN_ERR, skb, false);
#endif /* CONFIG_DEBUG_NET */
}

/*
 *	Add data to an sk_buff
 */
void *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len);
void *skb_put(struct sk_buff *skb, unsigned int len);
static inline void *__skb_put(struct sk_buff *skb, unsigned int len)
{
	void *tmp = skb_tail_pointer(skb);
	SKB_LINEAR_ASSERT(skb);
	skb->tail += len;
	skb->len  += len;
	return tmp;
}

static inline void *__skb_put_zero(struct sk_buff *skb, unsigned int len)
{
	void *tmp = __skb_put(skb, len);

memset(tmp, 0, len);
	return tmp;
}

static inline void *__skb_put_data(struct sk_buff *skb, const void *data,
				   unsigned int len)
{
	void *tmp = __skb_put(skb, len);

memcpy(tmp, data, len);
	return tmp;
}

static inline void __skb_put_u8(struct sk_buff *skb, u8 val)
{
	*(u8 *)__skb_put(skb, 1) = val;
}

static inline void *skb_put_zero(struct sk_buff *skb, unsigned int len)
{
	void *tmp = skb_put(skb, len);

memset(tmp, 0, len);

return tmp;
}

static inline void *skb_put_data(struct sk_buff *skb, const void *data,
				 unsigned int len)
{
	void *tmp = skb_put(skb, len);

memcpy(tmp, data, len);

return tmp;
}

static inline void skb_put_u8(struct sk_buff *skb, u8 val)
{
	*(u8 *)skb_put(skb, 1) = val;
}

void *skb_push(struct sk_buff *skb, unsigned int len);
static inline void *__skb_push(struct sk_buff *skb, unsigned int len)
{
	skb->data -= len;
	skb->len  += len;
	return skb->data;
}

void *skb_pull(struct sk_buff *skb, unsigned int len);
static inline void *__skb_pull(struct sk_buff *skb, unsigned int len)
{
	skb->len -= len;
	BUG_ON(skb->len < skb->data_len);
	return skb->data += len;
}

static inline void *skb_pull_inline(struct sk_buff *skb, unsigned int len)
{
	return unlikely(len > skb->len) ? NULL : __skb_pull(skb, len);
}

void *skb_pull_data(struct sk_buff *skb, size_t len);

void *__pskb_pull_tail(struct sk_buff *skb, int delta);

static inline void *__pskb_pull(struct sk_buff *skb, unsigned int len)
{
	if (len > skb_headlen(skb) &&
	    !__pskb_pull_tail(skb, len - skb_headlen(skb)))
		return NULL;
	skb->len -= len;
	return skb->data += len;
}

static inline void *pskb_pull(struct sk_buff *skb, unsigned int len)
{
	return unlikely(len > skb->len) ? NULL : __pskb_pull(skb, len);
}

static inline bool pskb_may_pull(struct sk_buff *skb, unsigned int len)
{
	if (likely(len <= skb_headlen(skb)))
		return true;
	if (unlikely(len > skb->len))
		return false;
	return __pskb_pull_tail(skb, len - skb_headlen(skb)) != NULL;
}

void skb_condense(struct sk_buff *skb);

/**
 *	skb_headroom - bytes at buffer head
 *	@skb: buffer to check
 *
 *	Return the number of bytes of free space at the head of an &sk_buff.
 */
static inline unsigned int skb_headroom(const struct sk_buff *skb)
{
	return skb->data - skb->head;
}

/**
 *	skb_tailroom - bytes at buffer end
 *	@skb: buffer to check
 *
 *	Return the number of bytes of free space at the tail of an sk_buff
 */
static inline int skb_tailroom(const struct sk_buff *skb)
{
	return skb_is_nonlinear(skb) ? 0 : skb->end - skb->tail;
}

/**
 *	skb_availroom - bytes at buffer end
 *	@skb: buffer to check
 *
 *	Return the number of bytes of free space at the tail of an sk_buff
 *	allocated by sk_stream_alloc()
 */
static inline int skb_availroom(const struct sk_buff *skb)
{
	if (skb_is_nonlinear(skb))
		return 0;

return skb->end - skb->tail - skb->reserved_tailroom;
}

/**
 *	skb_reserve - adjust headroom
 *	@skb: buffer to alter
 *	@len: bytes to move
 *
 *	Increase the headroom of an empty &sk_buff by reducing the tail
 *	room. This is only allowed for an empty buffer.
 */
static inline void skb_reserve(struct sk_buff *skb, int len)
{
	skb->data += len;
	skb->tail += len;
}

/**
 *	skb_tailroom_reserve - adjust reserved_tailroom
 *	@skb: buffer to alter
 *	@mtu: maximum amount of headlen permitted
 *	@needed_tailroom: minimum amount of reserved_tailroom
 *
 *	Set reserved_tailroom so that headlen can be as large as possible but
 *	not larger than mtu and tailroom cannot be smaller than
 *	needed_tailroom.
 *	The required headroom should already have been reserved before using
 *	this function.
 */
static inline void skb_tailroom_reserve(struct sk_buff *skb, unsigned int mtu,
					unsigned int needed_tailroom)
{
	SKB_LINEAR_ASSERT(skb);
	if (mtu < skb_tailroom(skb) - needed_tailroom)
		/* use at most mtu */
		skb->reserved_tailroom = skb_tailroom(skb) - mtu;
	else
		/* use up to all available space */
		skb->reserved_tailroom = needed_tailroom;
}

#define ENCAP_TYPE_ETHER	0
#define ENCAP_TYPE_IPPROTO	1

static inline void skb_set_inner_protocol(struct sk_buff *skb,
					  __be16 protocol)
{
	skb->inner_protocol = protocol;
	skb->inner_protocol_type = ENCAP_TYPE_ETHER;
}

static inline void skb_set_inner_ipproto(struct sk_buff *skb,
					 __u8 ipproto)
{
	skb->inner_ipproto = ipproto;
	skb->inner_protocol_type = ENCAP_TYPE_IPPROTO;
}

static inline void skb_reset_inner_headers(struct sk_buff *skb)
{
	skb->inner_mac_header = skb->mac_header;
	skb->inner_network_header = skb->network_header;
	skb->inner_transport_header = skb->transport_header;
}

static inline void skb_reset_mac_len(struct sk_buff *skb)
{
	skb->mac_len = skb->network_header - skb->mac_header;
}

static inline unsigned char *skb_inner_transport_header(const struct sk_buff
							*skb)
{
	return skb->head + skb->inner_transport_header;
}

static inline int skb_inner_transport_offset(const struct sk_buff *skb)
{
	return skb_inner_transport_header(skb) - skb->data;
}

static inline void skb_reset_inner_transport_header(struct sk_buff *skb)
{
	skb->inner_transport_header = skb->data - skb->head;
}

static inline void skb_set_inner_transport_header(struct sk_buff *skb,
						   const int offset)
{
	skb_reset_inner_transport_header(skb);
	skb->inner_transport_header += offset;
}

static inline unsigned char *skb_inner_network_header(const struct sk_buff *skb)
{
	return skb->head + skb->inner_network_header;
}

static inline void skb_reset_inner_network_header(struct sk_buff *skb)
{
	skb->inner_network_header = skb->data - skb->head;
}

static inline void skb_set_inner_network_header(struct sk_buff *skb,
						const int offset)
{
	skb_reset_inner_network_header(skb);
	skb->inner_network_header += offset;
}

static inline unsigned char *skb_inner_mac_header(const struct sk_buff *skb)
{
	return skb->head + skb->inner_mac_header;
}

static inline void skb_reset_inner_mac_header(struct sk_buff *skb)
{
	skb->inner_mac_header = skb->data - skb->head;
}

static inline void skb_set_inner_mac_header(struct sk_buff *skb,
					    const int offset)
{
	skb_reset_inner_mac_header(skb);
	skb->inner_mac_header += offset;
}
static inline bool skb_transport_header_was_set(const struct sk_buff *skb)
{
	return skb->transport_header != (typeof(skb->transport_header))~0U;
}

static inline unsigned char *skb_transport_header(const struct sk_buff *skb)
{
	return skb->head + skb->transport_header;
}

static inline void skb_reset_transport_header(struct sk_buff *skb)
{
	skb->transport_header = skb->data - skb->head;
}

/**
 * skb_reset_transport_header_careful - conditionally reset transport header
 * @skb: buffer to alter
 *
 * Hardened version of skb_reset_transport_header().
 *
 * Returns: true if the operation was a success.
 */
static inline bool __must_check
skb_reset_transport_header_careful(struct sk_buff *skb)
{
	long offset = skb->data - skb->head;

if (unlikely(offset != (typeof(skb->transport_header))offset))
		return false;

if (unlikely(offset == (typeof(skb->transport_header))~0U))
		return false;

skb->transport_header = offset;
	return true;
}

static inline void skb_set_transport_header(struct sk_buff *skb,
					    const int offset)
{
	skb_reset_transport_header(skb);
	skb->transport_header += offset;
}

static inline unsigned char *skb_network_header(const struct sk_buff *skb)
{
	return skb->head + skb->network_header;
}

static inline void skb_reset_network_header(struct sk_buff *skb)
{
	skb->network_header = skb->data - skb->head;
}

static inline void skb_set_network_header(struct sk_buff *skb, const int offset)
{
	skb_reset_network_header(skb);
	skb->network_header += offset;
}

static inline unsigned char *skb_mac_header(const struct sk_buff *skb)
{
	return skb->head + skb->mac_header;
}

static inline int skb_mac_offset(const struct sk_buff *skb)
{
	return skb_mac_header(skb) - skb->data;
}

static inline u32 skb_mac_header_len(const struct sk_buff *skb)
{
	return skb->network_header - skb->mac_header;
}

static inline int skb_mac_header_was_set(const struct sk_buff *skb)
{
	return skb->mac_header != (typeof(skb->mac_header))~0U;
}

static inline void skb_unset_mac_header(struct sk_buff *skb)
{
	skb->mac_header = (typeof(skb->mac_header))~0U;
}

static inline void skb_reset_mac_header(struct sk_buff *skb)
{
	skb->mac_header = skb->data - skb->head;
}

static inline void skb_set_mac_header(struct sk_buff *skb, const int offset)
{
	skb_reset_mac_header(skb);
	skb->mac_header += offset;
}

static inline void skb_pop_mac_header(struct sk_buff *skb)
{
	skb->mac_header = skb->network_header;
}

static inline void skb_probe_transport_header(struct sk_buff *skb)
{
	struct flow_keys_basic keys;

if (skb_transport_header_was_set(skb))
		return;

if (skb_flow_dissect_flow_keys_basic(NULL, skb, &keys,
					     NULL, 0, 0, 0, 0))
		skb_set_transport_header(skb, keys.control.thoff);
}

static inline void skb_mac_header_rebuild(struct sk_buff *skb)
{
	if (skb_mac_header_was_set(skb)) {
		const unsigned char *old_mac = skb_mac_header(skb);

skb_set_mac_header(skb, -skb->mac_len);
		memmove(skb_mac_header(skb), old_mac, skb->mac_len);
	}
}

/* Move the full mac header up to current network_header.
 * Leaves skb->data pointing at offset skb->mac_len into the mac_header.
 * Must be provided the complete mac header length.
 */
static inline void skb_mac_header_rebuild_full(struct sk_buff *skb, u32 full_mac_len)
{
	if (skb_mac_header_was_set(skb)) {
		const unsigned char *old_mac = skb_mac_header(skb);

skb_set_mac_header(skb, -full_mac_len);
		memmove(skb_mac_header(skb), old_mac, full_mac_len);
		__skb_push(skb, full_mac_len - skb->mac_len);
	}
}

static inline int skb_checksum_start_offset(const struct sk_buff *skb)
{
	return skb->csum_start - skb_headroom(skb);
}

static inline unsigned char *skb_checksum_start(const struct sk_buff *skb)
{
	return skb->head + skb->csum_start;
}

static inline int skb_transport_offset(const struct sk_buff *skb)
{
	return skb_transport_header(skb) - skb->data;
}

static inline u32 skb_network_header_len(const struct sk_buff *skb)
{
	return skb->transport_header - skb->network_header;
}

static inline u32 skb_inner_network_header_len(const struct sk_buff *skb)
{
	return skb->inner_transport_header - skb->inner_network_header;
}

static inline int skb_network_offset(const struct sk_buff *skb)
{
	return skb_network_header(skb) - skb->data;
}

static inline int skb_inner_network_offset(const struct sk_buff *skb)
{
	return skb_inner_network_header(skb) - skb->data;
}

static inline int pskb_network_may_pull(struct sk_buff *skb, unsigned int len)
{
	return pskb_may_pull(skb, skb_network_offset(skb) + len);
}

/*
 * CPUs often take a performance hit when accessing unaligned memory
 * locations. The actual performance hit varies, it can be small if the
 * hardware handles it or large if we have to take an exception and fix it
 * in software.
 *
 * Since an ethernet header is 14 bytes network drivers often end up with
 * the IP header at an unaligned offset. The IP header can be aligned by
 * shifting the start of the packet by 2 bytes. Drivers should do this
 * with:
 *
 * skb_reserve(skb, NET_IP_ALIGN);
 *
 * The downside to this alignment of the IP header is that the DMA is now
 * unaligned. On some architectures the cost of an unaligned DMA is high
 * and this cost outweighs the gains made by aligning the IP header.
 *
 * Since this trade off varies between architectures, we allow NET_IP_ALIGN
 * to be overridden.
 */
#ifndef NET_IP_ALIGN
#define NET_IP_ALIGN	2
#endif

/*
 * The networking layer reserves some headroom in skb data (via
 * dev_alloc_skb). This is used to avoid having to reallocate skb data when
 * the header has to grow. In the default case, if the header has to grow
 * 32 bytes or less we avoid the reallocation.
 *
 * Unfortunately this headroom changes the DMA alignment of the resulting
 * network packet. As for NET_IP_ALIGN, this unaligned DMA is expensive
 * on some architectures. An architecture can override this value,
 * perhaps setting it to a cacheline in size (since that will maintain
 * cacheline alignment of the DMA). It must be a power of 2.
 *
 * Various parts of the networking layer expect at least 32 bytes of
 * headroom, you should not reduce this.
 *
 * Using max(32, L1_CACHE_BYTES) makes sense (especially with RPS)
 * to reduce average number of cache lines per packet.
 * get_rps_cpu() for example only access one 64 bytes aligned block :
 * NET_IP_ALIGN(2) + ethernet_header(14) + IP_header(20/40) + ports(8)
 */
#ifndef NET_SKB_PAD
#define NET_SKB_PAD	max(32, L1_CACHE_BYTES)
#endif

int ___pskb_trim(struct sk_buff *skb, unsigned int len);

static inline void __skb_set_length(struct sk_buff *skb, unsigned int len)
{
	if (WARN_ON(skb_is_nonlinear(skb)))
		return;
	skb->len = len;
	skb_set_tail_pointer(skb, len);
}

static inline void __skb_trim(struct sk_buff *skb, unsigned int len)
{
	__skb_set_length(skb, len);
}

void skb_trim(struct sk_buff *skb, unsigned int len);

static inline int __pskb_trim(struct sk_buff *skb, unsigned int len)
{
	if (skb->data_len)
		return ___pskb_trim(skb, len);
	__skb_trim(skb, len);
	return 0;
}

static inline int pskb_trim(struct sk_buff *skb, unsigned int len)
{
	return (len < skb->len) ? __pskb_trim(skb, len) : 0;
}

/**
 *	pskb_trim_unique - remove end from a paged unique (not cloned) buffer
 *	@skb: buffer to alter
 *	@len: new length
 *
 *	This is identical to pskb_trim except that the caller knows that
 *	the skb is not cloned so we should never get an error due to out-
 *	of-memory.
 */
static inline void pskb_trim_unique(struct sk_buff *skb, unsigned int len)
{
	int err = pskb_trim(skb, len);
	BUG_ON(err);
}

static inline int __skb_grow(struct sk_buff *skb, unsigned int len)
{
	unsigned int diff = len - skb->len;

if (skb_tailroom(skb) < diff) {
		int ret = pskb_expand_head(skb, 0, diff - skb_tailroom(skb),
					   GFP_ATOMIC);
		if (ret)
			return ret;
	}
	__skb_set_length(skb, len);
	return 0;
}

/**
 *	skb_orphan - orphan a buffer
 *	@skb: buffer to orphan
 *
 *	If a buffer currently has an owner then we call the owner's
 *	destructor function and make the @skb unowned. The buffer continues
 *	to exist but is no longer charged to its former owner.
 */
static inline void skb_orphan(struct sk_buff *skb)
{
	if (skb->destructor) {
		skb->destructor(skb);
		skb->destructor = NULL;
		skb->sk		= NULL;
	} else {
		BUG_ON(skb->sk);
	}
}

/**
 *	skb_orphan_frags - orphan the frags contained in a buffer
 *	@skb: buffer to orphan frags from
 *	@gfp_mask: allocation mask for replacement pages
 *
 *	For each frag in the SKB which needs a destructor (i.e. has an
 *	owner) create a copy of that frag and release the original
 *	page by calling the destructor.
 */
static inline int skb_orphan_frags(struct sk_buff *skb, gfp_t gfp_mask)
{
	if (likely(!skb_zcopy(skb)))
		return 0;
	if (!skb_zcopy_is_nouarg(skb) &&
	    skb_uarg(skb)->callback == msg_zerocopy_callback)
		return 0;
	return skb_copy_ubufs(skb, gfp_mask);
}

/* Frags must be orphaned, even if refcounted, if skb might loop to rx path */
static inline int skb_orphan_frags_rx(struct sk_buff *skb, gfp_t gfp_mask)
{
	if (likely(!skb_zcopy(skb)))
		return 0;
	return skb_copy_ubufs(skb, gfp_mask);
}

/**
 *	__skb_queue_purge - empty a list
 *	@list: list to empty
 *
 *	Delete all buffers on an &sk_buff list. Each buffer is removed from
 *	the list and one reference dropped. This function does not take the
 *	list lock and the caller must hold the relevant locks to use it.
 */
static inline void __skb_queue_purge(struct sk_buff_head *list)
{
	struct sk_buff *skb;
	while ((skb = __skb_dequeue(list)) != NULL)
		kfree_skb(skb);
}
void skb_queue_purge(struct sk_buff_head *list);

unsigned int skb_rbtree_purge(struct rb_root *root);

void *__netdev_alloc_frag_align(unsigned int fragsz, unsigned int align_mask);

/**
 * netdev_alloc_frag - allocate a page fragment
 * @fragsz: fragment size
 *
 * Allocates a frag from a page for receive buffer.
 * Uses GFP_ATOMIC allocations.
 */
static inline void *netdev_alloc_frag(unsigned int fragsz)
{
	return __netdev_alloc_frag_align(fragsz, ~0u);
}

static inline void *netdev_alloc_frag_align(unsigned int fragsz,
					    unsigned int align)
{
	WARN_ON_ONCE(!is_power_of_2(align));
	return __netdev_alloc_frag_align(fragsz, -align);
}

struct sk_buff *__netdev_alloc_skb(struct net_device *dev, unsigned int length,
				   gfp_t gfp_mask);

/**
 *	netdev_alloc_skb - allocate an skbuff for rx on a specific device
 *	@dev: network device to receive on
 *	@length: length to allocate
 *
 *	Allocate a new &sk_buff and assign it a usage count of one. The
 *	buffer has unspecified headroom built in. Users should allocate
 *	the headroom they think they need without accounting for the
 *	built in space. The built in space is used for optimisations.
 *
 *	%NULL is returned if there is no free memory. Although this function
 *	allocates memory it can be called from an interrupt.
 */
static inline struct sk_buff *netdev_alloc_skb(struct net_device *dev,
					       unsigned int length)
{
	return __netdev_alloc_skb(dev, length, GFP_ATOMIC);
}

/* legacy helper around __netdev_alloc_skb() */
static inline struct sk_buff *__dev_alloc_skb(unsigned int length,
					      gfp_t gfp_mask)
{
	return __netdev_alloc_skb(NULL, length, gfp_mask);
}

/* legacy helper around netdev_alloc_skb() */
static inline struct sk_buff *dev_alloc_skb(unsigned int length)
{
	return netdev_alloc_skb(NULL, length);
}

static inline struct sk_buff *__netdev_alloc_skb_ip_align(struct net_device *dev,
		unsigned int length, gfp_t gfp)
{
	struct sk_buff *skb = __netdev_alloc_skb(dev, length + NET_IP_ALIGN, gfp);

if (NET_IP_ALIGN && skb)
		skb_reserve(skb, NET_IP_ALIGN);
	return skb;
}

static inline struct sk_buff *netdev_alloc_skb_ip_align(struct net_device *dev,
		unsigned int length)
{
	return __netdev_alloc_skb_ip_align(dev, length, GFP_ATOMIC);
}

static inline void skb_free_frag(void *addr)
{
	page_frag_free(addr);
}

void *__napi_alloc_frag_align(unsigned int fragsz, unsigned int align_mask);

static inline void *napi_alloc_frag(unsigned int fragsz)
{
	return __napi_alloc_frag_align(fragsz, ~0u);
}

static inline void *napi_alloc_frag_align(unsigned int fragsz,
					  unsigned int align)
{
	WARN_ON_ONCE(!is_power_of_2(align));
	return __napi_alloc_frag_align(fragsz, -align);
}

struct sk_buff *__napi_alloc_skb(struct napi_struct *napi,
				 unsigned int length, gfp_t gfp_mask);
static inline struct sk_buff *napi_alloc_skb(struct napi_struct *napi,
					     unsigned int length)
{
	return __napi_alloc_skb(napi, length, GFP_ATOMIC);
}
void napi_consume_skb(struct sk_buff *skb, int budget);

void napi_skb_free_stolen_head(struct sk_buff *skb);
void __kfree_skb_defer(struct sk_buff *skb);

/**
 * __dev_alloc_pages - allocate page for network Rx
 * @gfp_mask: allocation priority. Set __GFP_NOMEMALLOC if not for network Rx
 * @order: size of the allocation
 *
 * Allocate a new page.
 *
 * %NULL is returned if there is no free memory.
*/
static inline struct page *__dev_alloc_pages(gfp_t gfp_mask,
					     unsigned int order)
{
	/* This piece of code contains several assumptions.
	 * 1.  This is for device Rx, therefor a cold page is preferred.
	 * 2.  The expectation is the user wants a compound page.
	 * 3.  If requesting a order 0 page it will not be compound
	 *     due to the check to see if order has a value in prep_new_page
	 * 4.  __GFP_MEMALLOC is ignored if __GFP_NOMEMALLOC is set due to
	 *     code in gfp_to_alloc_flags that should be enforcing this.
	 */
	gfp_mask |= __GFP_COMP | __GFP_MEMALLOC;

return alloc_pages_node(NUMA_NO_NODE, gfp_mask, order);
}

static inline struct page *dev_alloc_pages(unsigned int order)
{
	return __dev_alloc_pages(GFP_ATOMIC | __GFP_NOWARN, order);
}

/**
 * __dev_alloc_page - allocate a page for network Rx
 * @gfp_mask: allocation priority. Set __GFP_NOMEMALLOC if not for network Rx
 *
 * Allocate a new page.
 *
 * %NULL is returned if there is no free memory.
 */
static inline struct page *__dev_alloc_page(gfp_t gfp_mask)
{
	return __dev_alloc_pages(gfp_mask, 0);
}

static inline struct page *dev_alloc_page(void)
{
	return dev_alloc_pages(0);
}

/**
 * dev_page_is_reusable - check whether a page can be reused for network Rx
 * @page: the page to test
 *
 * A page shouldn't be considered for reusing/recycling if it was allocated
 * under memory pressure or at a distant memory node.
 *
 * Returns false if this page should be returned to page allocator, true
 * otherwise.
 */
static inline bool dev_page_is_reusable(const struct page *page)
{
	return likely(page_to_nid(page) == numa_mem_id() &&
		      !page_is_pfmemalloc(page));
}

/**
 *	skb_propagate_pfmemalloc - Propagate pfmemalloc if skb is allocated after RX page
 *	@page: The page that was allocated from skb_alloc_page
 *	@skb: The skb that may need pfmemalloc set
 */
static inline void skb_propagate_pfmemalloc(const struct page *page,
					    struct sk_buff *skb)
{
	if (page_is_pfmemalloc(page))
		skb->pfmemalloc = true;
}

/**
 * skb_frag_off() - Returns the offset of a skb fragment
 * @frag: the paged fragment
 */
static inline unsigned int skb_frag_off(const skb_frag_t *frag)
{
	return frag->bv_offset;
}

/**
 * skb_frag_off_add() - Increments the offset of a skb fragment by @delta
 * @frag: skb fragment
 * @delta: value to add
 */
static inline void skb_frag_off_add(skb_frag_t *frag, int delta)
{
	frag->bv_offset += delta;
}

/**
 * skb_frag_off_set() - Sets the offset of a skb fragment
 * @frag: skb fragment
 * @offset: offset of fragment
 */
static inline void skb_frag_off_set(skb_frag_t *frag, unsigned int offset)
{
	frag->bv_offset = offset;
}

/**
 * skb_frag_off_copy() - Sets the offset of a skb fragment from another fragment
 * @fragto: skb fragment where offset is set
 * @fragfrom: skb fragment offset is copied from
 */
static inline void skb_frag_off_copy(skb_frag_t *fragto,
				     const skb_frag_t *fragfrom)
{
	fragto->bv_offset = fragfrom->bv_offset;
}

/**
 * skb_frag_page - retrieve the page referred to by a paged fragment
 * @frag: the paged fragment
 *
 * Returns the &struct page associated with @frag.
 */
static inline struct page *skb_frag_page(const skb_frag_t *frag)
{
	return frag->bv_page;
}

/**
 * __skb_frag_ref - take an addition reference on a paged fragment.
 * @frag: the paged fragment
 *
 * Takes an additional reference on the paged fragment @frag.
 */
static inline void __skb_frag_ref(skb_frag_t *frag)
{
	get_page(skb_frag_page(frag));
}

/**
 * skb_frag_ref - take an addition reference on a paged fragment of an skb.
 * @skb: the buffer
 * @f: the fragment offset.
 *
 * Takes an additional reference on the @f'th paged fragment of @skb.
 */
static inline void skb_frag_ref(struct sk_buff *skb, int f)
{
	__skb_frag_ref(&skb_shinfo(skb)->frags[f]);
}

/**
 * __skb_frag_unref - release a reference on a paged fragment.
 * @frag: the paged fragment
 * @recycle: recycle the page if allocated via page_pool
 *
 * Releases a reference on the paged fragment @frag
 * or recycles the page via the page_pool API.
 */
static inline void __skb_frag_unref(skb_frag_t *frag, bool recycle)
{
	struct page *page = skb_frag_page(frag);

#ifdef CONFIG_PAGE_POOL
	if (recycle && page_pool_return_skb_page(page))
		return;
#endif
	put_page(page);
}

/**
 * skb_frag_unref - release a reference on a paged fragment of an skb.
 * @skb: the buffer
 * @f: the fragment offset
 *
 * Releases a reference on the @f'th paged fragment of @skb.
 */
static inline void skb_frag_unref(struct sk_buff *skb, int f)
{
	__skb_frag_unref(&skb_shinfo(skb)->frags[f], skb->pp_recycle);
}

/**
 * skb_frag_address - gets the address of the data contained in a paged fragment
 * @frag: the paged fragment buffer
 *
 * Returns the address of the data within @frag. The page must already
 * be mapped.
 */
static inline void *skb_frag_address(const skb_frag_t *frag)
{
	return page_address(skb_frag_page(frag)) + skb_frag_off(frag);
}

/**
 * skb_frag_address_safe - gets the address of the data contained in a paged fragment
 * @frag: the paged fragment buffer
 *
 * Returns the address of the data within @frag. Checks that the page
 * is mapped and returns %NULL otherwise.
 */
static inline void *skb_frag_address_safe(const skb_frag_t *frag)
{
	struct page *page = skb_frag_page(frag);
	void *ptr;

if (!page)
		return NULL;

ptr = page_address(page);
	if (unlikely(!ptr))
		return NULL;

return ptr + skb_frag_off(frag);
}

/**
 * skb_frag_page_copy() - sets the page in a fragment from another fragment
 * @fragto: skb fragment where page is set
 * @fragfrom: skb fragment page is copied from
 */
static inline void skb_frag_page_copy(skb_frag_t *fragto,
				      const skb_frag_t *fragfrom)
{
	fragto->bv_page = fragfrom->bv_page;
}

/**
 * __skb_frag_set_page - sets the page contained in a paged fragment
 * @frag: the paged fragment
 * @page: the page to set
 *
 * Sets the fragment @frag to contain @page.
 */
static inline void __skb_frag_set_page(skb_frag_t *frag, struct page *page)
{
	frag->bv_page = page;
}

/**
 * skb_frag_set_page - sets the page contained in a paged fragment of an skb
 * @skb: the buffer
 * @f: the fragment offset
 * @page: the page to set
 *
 * Sets the @f'th fragment of @skb to contain @page.
 */
static inline void skb_frag_set_page(struct sk_buff *skb, int f,
				     struct page *page)
{
	__skb_frag_set_page(&skb_shinfo(skb)->frags[f], page);
}

bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t prio);

/**
 * skb_frag_dma_map - maps a paged fragment via the DMA API
 * @dev: the device to map the fragment to
 * @frag: the paged fragment to map
 * @offset: the offset within the fragment (starting at the
 *          fragment's own offset)
 * @size: the number of bytes to map
 * @dir: the direction of the mapping (``PCI_DMA_*``)
 *
 * Maps the page associated with @frag to @device.
 */
static inline dma_addr_t skb_frag_dma_map(struct device *dev,
					  const skb_frag_t *frag,
					  size_t offset, size_t size,
					  enum dma_data_direction dir)
{
	return dma_map_page(dev, skb_frag_page(frag),
			    skb_frag_off(frag) + offset, size, dir);
}

static inline struct sk_buff *pskb_copy(struct sk_buff *skb,
					gfp_t gfp_mask)
{
	return __pskb_copy(skb, skb_headroom(skb), gfp_mask);
}

static inline struct sk_buff *pskb_copy_for_clone(struct sk_buff *skb,
						  gfp_t gfp_mask)
{
	return __pskb_copy_fclone(skb, skb_headroom(skb), gfp_mask, true);
}

/**
 *	skb_clone_writable - is the header of a clone writable
 *	@skb: buffer to check
 *	@len: length up to which to write
 *
 *	Returns true if modifying the header part of the cloned buffer
 *	does not requires the data to be copied.
 */
static inline int skb_clone_writable(const struct sk_buff *skb, unsigned int len)
{
	return !skb_header_cloned(skb) &&
	       skb_headroom(skb) + len <= skb->hdr_len;
}

static inline int skb_try_make_writable(struct sk_buff *skb,
					unsigned int write_len)
{
	return skb_cloned(skb) && !skb_clone_writable(skb, write_len) &&
	       pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
}

static inline int __skb_cow(struct sk_buff *skb, unsigned int headroom,
			    int cloned)
{
	int delta = 0;

if (headroom > skb_headroom(skb))
		delta = headroom - skb_headroom(skb);

if (delta || cloned)
		return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD), 0,
					GFP_ATOMIC);
	return 0;
}

/**
 *	skb_cow - copy header of skb when it is required
 *	@skb: buffer to cow
 *	@headroom: needed headroom
 *
 *	If the skb passed lacks sufficient headroom or its data part
 *	is shared, data is reallocated. If reallocation fails, an error
 *	is returned and original skb is not changed.
 *
 *	The result is skb with writable area skb->head...skb->tail
 *	and at least @headroom of space at head.
 */
static inline int skb_cow(struct sk_buff *skb, unsigned int headroom)
{
	return __skb_cow(skb, headroom, skb_cloned(skb));
}

/**
 *	skb_cow_head - skb_cow but only making the head writable
 *	@skb: buffer to cow
 *	@headroom: needed headroom
 *
 *	This function is identical to skb_cow except that we replace the
 *	skb_cloned check by skb_header_cloned.  It should be used when
 *	you only need to push on some header and do not need to modify
 *	the data.
 */
static inline int skb_cow_head(struct sk_buff *skb, unsigned int headroom)
{
	return __skb_cow(skb, headroom, skb_header_cloned(skb));
}

/**
 *	skb_padto	- pad an skbuff up to a minimal size
 *	@skb: buffer to pad
 *	@len: minimal length
 *
 *	Pads up a buffer to ensure the trailing bytes exist and are
 *	blanked. If the buffer already contains sufficient data it
 *	is untouched. Otherwise it is extended. Returns zero on
 *	success. The skb is freed on error.
 */
static inline int skb_padto(struct sk_buff *skb, unsigned int len)
{
	unsigned int size = skb->len;
	if (likely(size >= len))
		return 0;
	return skb_pad(skb, len - size);
}

/**
 *	__skb_put_padto - increase size and pad an skbuff up to a minimal size
 *	@skb: buffer to pad
 *	@len: minimal length
 *	@free_on_error: free buffer on error
 *
 *	Pads up a buffer to ensure the trailing bytes exist and are
 *	blanked. If the buffer already contains sufficient data it
 *	is untouched. Otherwise it is extended. Returns zero on
 *	success. The skb is freed on error if @free_on_error is true.
 */
static inline int __must_check __skb_put_padto(struct sk_buff *skb,
					       unsigned int len,
					       bool free_on_error)
{
	unsigned int size = skb->len;

if (unlikely(size < len)) {
		len -= size;
		if (__skb_pad(skb, len, free_on_error))
			return -ENOMEM;
		__skb_put(skb, len);
	}
	return 0;
}

/**
 *	skb_put_padto - increase size and pad an skbuff up to a minimal size
 *	@skb: buffer to pad
 *	@len: minimal length
 *
 *	Pads up a buffer to ensure the trailing bytes exist and are
 *	blanked. If the buffer already contains sufficient data it
 *	is untouched. Otherwise it is extended. Returns zero on
 *	success. The skb is freed on error.
 */
static inline int __must_check skb_put_padto(struct sk_buff *skb, unsigned int len)
{
	return __skb_put_padto(skb, len, true);
}

static inline int skb_add_data(struct sk_buff *skb,
			       struct iov_iter *from, int copy)
{
	const int off = skb->len;

if (skb->ip_summed == CHECKSUM_NONE) {
		__wsum csum = 0;
		if (csum_and_copy_from_iter_full(skb_put(skb, copy), copy,
					         &csum, from)) {
			skb->csum = csum_block_add(skb->csum, csum, off);
			return 0;
		}
	} else if (copy_from_iter_full(skb_put(skb, copy), copy, from))
		return 0;

__skb_trim(skb, off);
	return -EFAULT;
}

static inline bool skb_can_coalesce(struct sk_buff *skb, int i,
				    const struct page *page, int off)
{
	if (skb_zcopy(skb))
		return false;
	if (i) {
		const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];

return page == skb_frag_page(frag) &&
		       off == skb_frag_off(frag) + skb_frag_size(frag);
	}
	return false;
}

static inline int __skb_linearize(struct sk_buff *skb)
{
	return __pskb_pull_tail(skb, skb->data_len) ? 0 : -ENOMEM;
}

/**
 *	skb_linearize - convert paged skb to linear one
 *	@skb: buffer to linarize
 *
 *	If there is no free memory -ENOMEM is returned, otherwise zero
 *	is returned and the old skb data released.
 */
static inline int skb_linearize(struct sk_buff *skb)
{
	return skb_is_nonlinear(skb) ? __skb_linearize(skb) : 0;
}

/**
 * skb_has_shared_frag - can any frag be overwritten
 * @skb: buffer to test
 *
 * Return true if the skb has at least one frag that might be modified
 * by an external entity (as in vmsplice()/sendfile())
 */
static inline bool skb_has_shared_frag(const struct sk_buff *skb)
{
	return skb_is_nonlinear(skb) &&
	       skb_shinfo(skb)->flags & SKBFL_SHARED_FRAG;
}

/**
 *	skb_linearize_cow - make sure skb is linear and writable
 *	@skb: buffer to process
 *
 *	If there is no free memory -ENOMEM is returned, otherwise zero
 *	is returned and the old skb data released.
 */
static inline int skb_linearize_cow(struct sk_buff *skb)
{
	return skb_is_nonlinear(skb) || skb_cloned(skb) ?
	       __skb_linearize(skb) : 0;
}

static __always_inline void
__skb_postpull_rcsum(struct sk_buff *skb, const void *start, unsigned int len,
		     unsigned int off)
{
	if (skb->ip_summed == CHECKSUM_COMPLETE)
		skb->csum = csum_block_sub(skb->csum,
					   csum_partial(start, len, 0), off);
	else if (skb->ip_summed == CHECKSUM_PARTIAL &&
		 skb_checksum_start_offset(skb) < 0)
		skb->ip_summed = CHECKSUM_NONE;
}

/**
 *	skb_postpull_rcsum - update checksum for received skb after pull
 *	@skb: buffer to update
 *	@start: start of data before pull
 *	@len: length of data pulled
 *
 *	After doing a pull on a received packet, you need to call this to
 *	update the CHECKSUM_COMPLETE checksum, or set ip_summed to
 *	CHECKSUM_NONE so that it can be recomputed from scratch.
 */
static inline void skb_postpull_rcsum(struct sk_buff *skb,
				      const void *start, unsigned int len)
{
	__skb_postpull_rcsum(skb, start, len, 0);
}

static __always_inline void
__skb_postpush_rcsum(struct sk_buff *skb, const void *start, unsigned int len,
		     unsigned int off)
{
	if (skb->ip_summed == CHECKSUM_COMPLETE)
		skb->csum = csum_block_add(skb->csum,
					   csum_partial(start, len, 0), off);
}

/**
 *	skb_postpush_rcsum - update checksum for received skb after push
 *	@skb: buffer to update
 *	@start: start of data after push
 *	@len: length of data pushed
 *
 *	After doing a push on a received packet, you need to call this to
 *	update the CHECKSUM_COMPLETE checksum.
 */
static inline void skb_postpush_rcsum(struct sk_buff *skb,
				      const void *start, unsigned int len)
{
	__skb_postpush_rcsum(skb, start, len, 0);
}

void *skb_pull_rcsum(struct sk_buff *skb, unsigned int len);

/**
 *	skb_push_rcsum - push skb and update receive checksum
 *	@skb: buffer to update
 *	@len: length of data pulled
 *
 *	This function performs an skb_push on the packet and updates
 *	the CHECKSUM_COMPLETE checksum.  It should be used on
 *	receive path processing instead of skb_push unless you know
 *	that the checksum difference is zero (e.g., a valid IP header)
 *	or you are setting ip_summed to CHECKSUM_NONE.
 */
static inline void *skb_push_rcsum(struct sk_buff *skb, unsigned int len)
{
	skb_push(skb, len);
	skb_postpush_rcsum(skb, skb->data, len);
	return skb->data;
}

int pskb_trim_rcsum_slow(struct sk_buff *skb, unsigned int len);
/**
 *	pskb_trim_rcsum - trim received skb and update checksum
 *	@skb: buffer to trim
 *	@len: new length
 *
 *	This is exactly the same as pskb_trim except that it ensures the
 *	checksum of received packets are still valid after the operation.
 *	It can change skb pointers.
 */

static inline int pskb_trim_rcsum(struct sk_buff *skb, unsigned int len)
{
	if (likely(len >= skb->len))
		return 0;
	return pskb_trim_rcsum_slow(skb, len);
}

static inline int __skb_trim_rcsum(struct sk_buff *skb, unsigned int len)
{
	if (skb->ip_summed == CHECKSUM_COMPLETE)
		skb->ip_summed = CHECKSUM_NONE;
	__skb_trim(skb, len);
	return 0;
}

static inline int __skb_grow_rcsum(struct sk_buff *skb, unsigned int len)
{
	if (skb->ip_summed == CHECKSUM_COMPLETE)
		skb->ip_summed = CHECKSUM_NONE;
	return __skb_grow(skb, len);
}

#define rb_to_skb(rb) rb_entry_safe(rb, struct sk_buff, rbnode)
#define skb_rb_first(root) rb_to_skb(rb_first(root))
#define skb_rb_last(root)  rb_to_skb(rb_last(root))
#define skb_rb_next(skb)   rb_to_skb(rb_next(&(skb)->rbnode))
#define skb_rb_prev(skb)   rb_to_skb(rb_prev(&(skb)->rbnode))

#define skb_queue_walk(queue, skb) \
		for (skb = (queue)->next;					\
		     skb != (struct sk_buff *)(queue);				\
		     skb = skb->next)

#define skb_queue_walk_safe(queue, skb, tmp)					\
		for (skb = (queue)->next, tmp = skb->next;			\
		     skb != (struct sk_buff *)(queue);				\
		     skb = tmp, tmp = skb->next)

#define skb_queue_walk_from(queue, skb)						\
		for (; skb != (struct sk_buff *)(queue);			\
		     skb = skb->next)

#define skb_rbtree_walk(skb, root)						\
		for (skb = skb_rb_first(root); skb != NULL;			\
		     skb = skb_rb_next(skb))

#define skb_rbtree_walk_from(skb)						\
		for (; skb != NULL;						\
		     skb = skb_rb_next(skb))

#define skb_rbtree_walk_from_safe(skb, tmp)					\
		for (; tmp = skb ? skb_rb_next(skb) : NULL, (skb != NULL);	\
		     skb = tmp)

#define skb_queue_walk_from_safe(queue, skb, tmp)				\
		for (tmp = skb->next;						\
		     skb != (struct sk_buff *)(queue);				\
		     skb = tmp, tmp = skb->next)

#define skb_queue_reverse_walk(queue, skb) \
		for (skb = (queue)->prev;					\
		     skb != (struct sk_buff *)(queue);				\
		     skb = skb->prev)

#define skb_queue_reverse_walk_safe(queue, skb, tmp)				\
		for (skb = (queue)->prev, tmp = skb->prev;			\
		     skb != (struct sk_buff *)(queue);				\
		     skb = tmp, tmp = skb->prev)

#define skb_queue_reverse_walk_from_safe(queue, skb, tmp)			\
		for (tmp = skb->prev;						\
		     skb != (struct sk_buff *)(queue);				\
		     skb = tmp, tmp = skb->prev)

static inline bool skb_has_frag_list(const struct sk_buff *skb)
{
	return skb_shinfo(skb)->frag_list != NULL;
}

static inline void skb_frag_list_init(struct sk_buff *skb)
{
	skb_shinfo(skb)->frag_list = NULL;
}

#define skb_walk_frags(skb, iter)	\
	for (iter = skb_shinfo(skb)->frag_list; iter; iter = iter->next)

int __skb_wait_for_more_packets(struct sock *sk, struct sk_buff_head *queue,
				int *err, long *timeo_p,
				const struct sk_buff *skb);
struct sk_buff *__skb_try_recv_from_queue(struct sock *sk,
					  struct sk_buff_head *queue,
					  unsigned int flags,
					  int *off, int *err,
					  struct sk_buff **last);
struct sk_buff *__skb_try_recv_datagram(struct sock *sk,
					struct sk_buff_head *queue,
					unsigned int flags, int *off, int *err,
					struct sk_buff **last);
struct sk_buff *__skb_recv_datagram(struct sock *sk,
				    struct sk_buff_head *sk_queue,
				    unsigned int flags, int *off, int *err);
struct sk_buff *skb_recv_datagram(struct sock *sk, unsigned flags, int noblock,
				  int *err);
__poll_t datagram_poll(struct file *file, struct socket *sock,
			   struct poll_table_struct *wait);
int skb_copy_datagram_iter(const struct sk_buff *from, int offset,
			   struct iov_iter *to, int size);
static inline int skb_copy_datagram_msg(const struct sk_buff *from, int offset,
					struct msghdr *msg, int size)
{
	return skb_copy_datagram_iter(from, offset, &msg->msg_iter, size);
}
int skb_copy_and_csum_datagram_msg(struct sk_buff *skb, int hlen,
				   struct msghdr *msg);
int skb_copy_and_hash_datagram_iter(const struct sk_buff *skb, int offset,
			   struct iov_iter *to, int len,
			   struct ahash_request *hash);
int skb_copy_datagram_from_iter(struct sk_buff *skb, int offset,
				 struct iov_iter *from, int len);
int zerocopy_sg_from_iter(struct sk_buff *skb, struct iov_iter *frm);
void skb_free_datagram(struct sock *sk, struct sk_buff *skb);
void __skb_free_datagram_locked(struct sock *sk, struct sk_buff *skb, int len);
static inline void skb_free_datagram_locked(struct sock *sk,
					    struct sk_buff *skb)
{
	__skb_free_datagram_locked(sk, skb, 0);
}
int skb_kill_datagram(struct sock *sk, struct sk_buff *skb, unsigned int flags);
int skb_copy_bits(const struct sk_buff *skb, int offset, void *to, int len);
int skb_store_bits(struct sk_buff *skb, int offset, const void *from, int len);
__wsum skb_copy_and_csum_bits(const struct sk_buff *skb, int offset, u8 *to,
			      int len);
int skb_splice_bits(struct sk_buff *skb, struct sock *sk, unsigned int offset,
		    struct pipe_inode_info *pipe, unsigned int len,
		    unsigned int flags);
int skb_send_sock_locked(struct sock *sk, struct sk_buff *skb, int offset,
			 int len);
int skb_send_sock(struct sock *sk, struct sk_buff *skb, int offset, int len);
void skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to);
unsigned int skb_zerocopy_headlen(const struct sk_buff *from);
int skb_zerocopy(struct sk_buff *to, struct sk_buff *from,
		 int len, int hlen);
void skb_split(struct sk_buff *skb, struct sk_buff *skb1, const u32 len);
int skb_shift(struct sk_buff *tgt, struct sk_buff *skb, int shiftlen);
void skb_scrub_packet(struct sk_buff *skb, bool xnet);
bool skb_gso_validate_network_len(const struct sk_buff *skb, unsigned int mtu);
bool skb_gso_validate_mac_len(const struct sk_buff *skb, unsigned int len);
struct sk_buff *skb_segment(struct sk_buff *skb, netdev_features_t features);
struct sk_buff *skb_segment_list(struct sk_buff *skb, netdev_features_t features,
				 unsigned int offset);
struct sk_buff *skb_vlan_untag(struct sk_buff *skb);
int skb_ensure_writable(struct sk_buff *skb, int write_len);
int __skb_vlan_pop(struct sk_buff *skb, u16 *vlan_tci);
int skb_vlan_pop(struct sk_buff *skb);
int skb_vlan_push(struct sk_buff *skb, __be16 vlan_proto, u16 vlan_tci);
int skb_eth_pop(struct sk_buff *skb);
int skb_eth_push(struct sk_buff *skb, const unsigned char *dst,
		 const unsigned char *src);
int skb_mpls_push(struct sk_buff *skb, __be32 mpls_lse, __be16 mpls_proto,
		  int mac_len, bool ethernet);
int skb_mpls_pop(struct sk_buff *skb, __be16 next_proto, int mac_len,
		 bool ethernet);
int skb_mpls_update_lse(struct sk_buff *skb, __be32 mpls_lse);
int skb_mpls_dec_ttl(struct sk_buff *skb);
struct sk_buff *pskb_extract(struct sk_buff *skb, int off, int to_copy,
			     gfp_t gfp);

static inline int memcpy_from_msg(void *data, struct msghdr *msg, int len)
{
	return copy_from_iter_full(data, len, &msg->msg_iter) ? 0 : -EFAULT;
}

static inline int memcpy_to_msg(struct msghdr *msg, void *data, int len)
{
	return copy_to_iter(data, len, &msg->msg_iter) == len ? 0 : -EFAULT;
}

struct skb_checksum_ops {
	__wsum (*update)(const void *mem, int len, __wsum wsum);
	__wsum (*combine)(__wsum csum, __wsum csum2, int offset, int len);
};

extern const struct skb_checksum_ops *crc32c_csum_stub __read_mostly;

__wsum __skb_checksum(const struct sk_buff *skb, int offset, int len,
		      __wsum csum, const struct skb_checksum_ops *ops);
__wsum skb_checksum(const struct sk_buff *skb, int offset, int len,
		    __wsum csum);

static inline void * __must_check
__skb_header_pointer(const struct sk_buff *skb, int offset, int len,
		     const void *data, int hlen, void *buffer)
{
	if (likely(hlen - offset >= len))
		return (void *)data + offset;

if (!skb || unlikely(skb_copy_bits(skb, offset, buffer, len) < 0))
		return NULL;

return buffer;
}

static inline void * __must_check
skb_header_pointer(const struct sk_buff *skb, int offset, int len, void *buffer)
{
	return __skb_header_pointer(skb, offset, len, skb->data,
				    skb_headlen(skb), buffer);
}

/* Variant of skb_header_pointer() where @offset is user-controlled
 * and potentially negative.
 */
static inline void * __must_check
skb_header_pointer_careful(const struct sk_buff *skb, int offset,
			   int len, void *buffer)
{
	if (unlikely(offset < 0 && -offset > skb_headroom(skb)))
		return NULL;
	return skb_header_pointer(skb, offset, len, buffer);
}

/**
 *	skb_needs_linearize - check if we need to linearize a given skb
 *			      depending on the given device features.
 *	@skb: socket buffer to check
 *	@features: net device features
 *
 *	Returns true if either:
 *	1. skb has frag_list and the device doesn't support FRAGLIST, or
 *	2. skb is fragmented and the device does not support SG.
 */
static inline bool skb_needs_linearize(struct sk_buff *skb,
				       netdev_features_t features)
{
	return skb_is_nonlinear(skb) &&
	       ((skb_has_frag_list(skb) && !(features & NETIF_F_FRAGLIST)) ||
		(skb_shinfo(skb)->nr_frags && !(features & NETIF_F_SG)));
}

static inline void skb_copy_from_linear_data(const struct sk_buff *skb,
					     void *to,
					     const unsigned int len)
{
	memcpy(to, skb->data, len);
}

static inline void skb_copy_from_linear_data_offset(const struct sk_buff *skb,
						    const int offset, void *to,
						    const unsigned int len)
{
	memcpy(to, skb->data + offset, len);
}

static inline void skb_copy_to_linear_data(struct sk_buff *skb,
					   const void *from,
					   const unsigned int len)
{
	memcpy(skb->data, from, len);
}

static inline void skb_copy_to_linear_data_offset(struct sk_buff *skb,
						  const int offset,
						  const void *from,
						  const unsigned int len)
{
	memcpy(skb->data + offset, from, len);
}

void skb_init(void);

static inline ktime_t skb_get_ktime(const struct sk_buff *skb)
{
	return skb->tstamp;
}

/**
 *	skb_get_timestamp - get timestamp from a skb
 *	@skb: skb to get stamp from
 *	@stamp: pointer to struct __kernel_old_timeval to store stamp in
 *
 *	Timestamps are stored in the skb as offsets to a base timestamp.
 *	This function converts the offset back to a struct timeval and stores
 *	it in stamp.
 */
static inline void skb_get_timestamp(const struct sk_buff *skb,
				     struct __kernel_old_timeval *stamp)
{
	*stamp = ns_to_kernel_old_timeval(skb->tstamp);
}

static inline void skb_get_new_timestamp(const struct sk_buff *skb,
					 struct __kernel_sock_timeval *stamp)
{
	struct timespec64 ts = ktime_to_timespec64(skb->tstamp);

stamp->tv_sec = ts.tv_sec;
	stamp->tv_usec = ts.tv_nsec / 1000;
}

static inline void skb_get_timestampns(const struct sk_buff *skb,
				       struct __kernel_old_timespec *stamp)
{
	struct timespec64 ts = ktime_to_timespec64(skb->tstamp);

stamp->tv_sec = ts.tv_sec;
	stamp->tv_nsec = ts.tv_nsec;
}

static inline void skb_get_new_timestampns(const struct sk_buff *skb,
					   struct __kernel_timespec *stamp)
{
	struct timespec64 ts = ktime_to_timespec64(skb->tstamp);

stamp->tv_sec = ts.tv_sec;
	stamp->tv_nsec = ts.tv_nsec;
}

static inline void __net_timestamp(struct sk_buff *skb)
{
	skb->tstamp = ktime_get_real();
}

static inline ktime_t net_timedelta(ktime_t t)
{
	return ktime_sub(ktime_get_real(), t);
}

static inline ktime_t net_invalid_timestamp(void)
{
	return 0;
}

static inline u8 skb_metadata_len(const struct sk_buff *skb)
{
	return skb_shinfo(skb)->meta_len;
}

static inline void *skb_metadata_end(const struct sk_buff *skb)
{
	return skb_mac_header(skb);
}

static inline bool __skb_metadata_differs(const struct sk_buff *skb_a,
					  const struct sk_buff *skb_b,
					  u8 meta_len)
{
	const void *a = skb_metadata_end(skb_a);
	const void *b = skb_metadata_end(skb_b);
	/* Using more efficient varaiant than plain call to memcmp(). */
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
	u64 diffs = 0;

switch (meta_len) {
#define __it(x, op) (x -= sizeof(u##op))
#define __it_diff(a, b, op) (*(u##op *)__it(a, op)) ^ (*(u##op *)__it(b, op))
	case 32: diffs |= __it_diff(a, b, 64);
		fallthrough;
	case 24: diffs |= __it_diff(a, b, 64);
		fallthrough;
	case 16: diffs |= __it_diff(a, b, 64);
		fallthrough;
	case  8: diffs |= __it_diff(a, b, 64);
		break;
	case 28: diffs |= __it_diff(a, b, 64);
		fallthrough;
	case 20: diffs |= __it_diff(a, b, 64);
		fallthrough;
	case 12: diffs |= __it_diff(a, b, 64);
		fallthrough;
	case  4: diffs |= __it_diff(a, b, 32);
		break;
	}
	return diffs;
#else
	return memcmp(a - meta_len, b - meta_len, meta_len);
#endif
}

static inline bool skb_metadata_differs(const struct sk_buff *skb_a,
					const struct sk_buff *skb_b)
{
	u8 len_a = skb_metadata_len(skb_a);
	u8 len_b = skb_metadata_len(skb_b);

if (!(len_a | len_b))
		return false;

return len_a != len_b ?
	       true : __skb_metadata_differs(skb_a, skb_b, len_a);
}

static inline void skb_metadata_set(struct sk_buff *skb, u8 meta_len)
{
	skb_shinfo(skb)->meta_len = meta_len;
}

static inline void skb_metadata_clear(struct sk_buff *skb)
{
	skb_metadata_set(skb, 0);
}

struct sk_buff *skb_clone_sk(struct sk_buff *skb);

#ifdef CONFIG_NETWORK_PHY_TIMESTAMPING

void skb_clone_tx_timestamp(struct sk_buff *skb);
bool skb_defer_rx_timestamp(struct sk_buff *skb);

#else /* CONFIG_NETWORK_PHY_TIMESTAMPING */

static inline void skb_clone_tx_timestamp(struct sk_buff *skb)
{
}

static inline bool skb_defer_rx_timestamp(struct sk_buff *skb)
{
	return false;
}

#endif /* !CONFIG_NETWORK_PHY_TIMESTAMPING */

/**
 * skb_complete_tx_timestamp() - deliver cloned skb with tx timestamps
 *
 * PHY drivers may accept clones of transmitted packets for
 * timestamping via their phy_driver.txtstamp method. These drivers
 * must call this function to return the skb back to the stack with a
 * timestamp.
 *
 * @skb: clone of the original outgoing packet
 * @hwtstamps: hardware time stamps
 *
 */
void skb_complete_tx_timestamp(struct sk_buff *skb,
			       struct skb_shared_hwtstamps *hwtstamps);

void __skb_tstamp_tx(struct sk_buff *orig_skb, const struct sk_buff *ack_skb,
		     struct skb_shared_hwtstamps *hwtstamps,
		     struct sock *sk, int tstype);

/**
 * skb_tstamp_tx - queue clone of skb with send time stamps
 * @orig_skb:	the original outgoing packet
 * @hwtstamps:	hardware time stamps, may be NULL if not available
 *
 * If the skb has a socket associated, then this function clones the
 * skb (thus sharing the actual data and optional structures), stores
 * the optional hardware time stamping information (if non NULL) or
 * generates a software time stamp (otherwise), then queues the clone
 * to the error queue of the socket.  Errors are silently ignored.
 */
void skb_tstamp_tx(struct sk_buff *orig_skb,
		   struct skb_shared_hwtstamps *hwtstamps);

/**
 * skb_tx_timestamp() - Driver hook for transmit timestamping
 *
 * Ethernet MAC Drivers should call this function in their hard_xmit()
 * function immediately before giving the sk_buff to the MAC hardware.
 *
 * Specifically, one should make absolutely sure that this function is
 * called before TX completion of this packet can trigger.  Otherwise
 * the packet could potentially already be freed.
 *
 * @skb: A socket buffer.
 */
static inline void skb_tx_timestamp(struct sk_buff *skb)
{
	skb_clone_tx_timestamp(skb);
	if (skb_shinfo(skb)->tx_flags & SKBTX_SW_TSTAMP)
		skb_tstamp_tx(skb, NULL);
}

/**
 * skb_complete_wifi_ack - deliver skb with wifi status
 *
 * @skb: the original outgoing packet
 * @acked: ack status
 *
 */
void skb_complete_wifi_ack(struct sk_buff *skb, bool acked);

__sum16 __skb_checksum_complete_head(struct sk_buff *skb, int len);
__sum16 __skb_checksum_complete(struct sk_buff *skb);

static inline int skb_csum_unnecessary(const struct sk_buff *skb)
{
	return ((skb->ip_summed == CHECKSUM_UNNECESSARY) ||
		skb->csum_valid ||
		(skb->ip_summed == CHECKSUM_PARTIAL &&
		 skb_checksum_start_offset(skb) >= 0));
}

/**
 *	skb_checksum_complete - Calculate checksum of an entire packet
 *	@skb: packet to process
 *
 *	This function calculates the checksum over the entire packet plus
 *	the value of skb->csum.  The latter can be used to supply the
 *	checksum of a pseudo header as used by TCP/UDP.  It returns the
 *	checksum.
 *
 *	For protocols that contain complete checksums such as ICMP/TCP/UDP,
 *	this function can be used to verify that checksum on received
 *	packets.  In that case the function should return zero if the
 *	checksum is correct.  In particular, this function will return zero
 *	if skb->ip_summed is CHECKSUM_UNNECESSARY which indicates that the
 *	hardware has already verified the correctness of the checksum.
 */
static inline __sum16 skb_checksum_complete(struct sk_buff *skb)
{
	return skb_csum_unnecessary(skb) ?
	       0 : __skb_checksum_complete(skb);
}

static inline void __skb_decr_checksum_unnecessary(struct sk_buff *skb)
{
	if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
		if (skb->csum_level == 0)
			skb->ip_summed = CHECKSUM_NONE;
		else
			skb->csum_level--;
	}
}

static inline void __skb_incr_checksum_unnecessary(struct sk_buff *skb)
{
	if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
		if (skb->csum_level < SKB_MAX_CSUM_LEVEL)
			skb->csum_level++;
	} else if (skb->ip_summed == CHECKSUM_NONE) {
		skb->ip_summed = CHECKSUM_UNNECESSARY;
		skb->csum_level = 0;
	}
}

static inline void __skb_reset_checksum_unnecessary(struct sk_buff *skb)
{
	if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
		skb->ip_summed = CHECKSUM_NONE;
		skb->csum_level = 0;
	}
}

/* Check if we need to perform checksum complete validation.
 *
 * Returns true if checksum complete is needed, false otherwise
 * (either checksum is unnecessary or zero checksum is allowed).
 */
static inline bool __skb_checksum_validate_needed(struct sk_buff *skb,
						  bool zero_okay,
						  __sum16 check)
{
	if (skb_csum_unnecessary(skb) || (zero_okay && !check)) {
		skb->csum_valid = 1;
		__skb_decr_checksum_unnecessary(skb);
		return false;
	}

return true;
}

/* For small packets <= CHECKSUM_BREAK perform checksum complete directly
 * in checksum_init.
 */
#define CHECKSUM_BREAK 76

/* Unset checksum-complete
 *
 * Unset checksum complete can be done when packet is being modified
 * (uncompressed for instance) and checksum-complete value is
 * invalidated.
 */
static inline void skb_checksum_complete_unset(struct sk_buff *skb)
{
	if (skb->ip_summed == CHECKSUM_COMPLETE)
		skb->ip_summed = CHECKSUM_NONE;
}

/* Validate (init) checksum based on checksum complete.
 *
 * Return values:
 *   0: checksum is validated or try to in skb_checksum_complete. In the latter
 *	case the ip_summed will not be CHECKSUM_UNNECESSARY and the pseudo
 *	checksum is stored in skb->csum for use in __skb_checksum_complete
 *   non-zero: value of invalid checksum
 *
 */
static inline __sum16 __skb_checksum_validate_complete(struct sk_buff *skb,
						       bool complete,
						       __wsum psum)
{
	if (skb->ip_summed == CHECKSUM_COMPLETE) {
		if (!csum_fold(csum_add(psum, skb->csum))) {
			skb->csum_valid = 1;
			return 0;
		}
	}

skb->csum = psum;

if (complete || skb->len <= CHECKSUM_BREAK) {
		__sum16 csum;

csum = __skb_checksum_complete(skb);
		skb->csum_valid = !csum;
		return csum;
	}

return 0;
}

static inline __wsum null_compute_pseudo(struct sk_buff *skb, int proto)
{
	return 0;
}

/* Perform checksum validate (init). Note that this is a macro since we only
 * want to calculate the pseudo header which is an input function if necessary.
 * First we try to validate without any computation (checksum unnecessary) and
 * then calculate based on checksum complete calling the function to compute
 * pseudo header.
 *
 * Return values:
 *   0: checksum is validated or try to in skb_checksum_complete
 *   non-zero: value of invalid checksum
 */
#define __skb_checksum_validate(skb, proto, complete,			\
				zero_okay, check, compute_pseudo)	\
({									\
	__sum16 __ret = 0;						\
	skb->csum_valid = 0;						\
	if (__skb_checksum_validate_needed(skb, zero_okay, check))	\
		__ret = __skb_checksum_validate_complete(skb,		\
				complete, compute_pseudo(skb, proto));	\
	__ret;								\
})

#define skb_checksum_init(skb, proto, compute_pseudo)			\
	__skb_checksum_validate(skb, proto, false, false, 0, compute_pseudo)

#define skb_checksum_init_zero_check(skb, proto, check, compute_pseudo)	\
	__skb_checksum_validate(skb, proto, false, true, check, compute_pseudo)

#define skb_checksum_validate(skb, proto, compute_pseudo)		\
	__skb_checksum_validate(skb, proto, true, false, 0, compute_pseudo)

#define skb_checksum_validate_zero_check(skb, proto, check,		\
					 compute_pseudo)		\
	__skb_checksum_validate(skb, proto, true, true, check, compute_pseudo)

#define skb_checksum_simple_validate(skb)				\
	__skb_checksum_validate(skb, 0, true, false, 0, null_compute_pseudo)

static inline bool __skb_checksum_convert_check(struct sk_buff *skb)
{
	return (skb->ip_summed == CHECKSUM_NONE && skb->csum_valid);
}

static inline void __skb_checksum_convert(struct sk_buff *skb, __wsum pseudo)
{
	skb->csum = ~pseudo;
	skb->ip_summed = CHECKSUM_COMPLETE;
}

#define skb_checksum_try_convert(skb, proto, compute_pseudo)	\
do {									\
	if (__skb_checksum_convert_check(skb))				\
		__skb_checksum_convert(skb, compute_pseudo(skb, proto)); \
} while (0)

static inline void skb_remcsum_adjust_partial(struct sk_buff *skb, void *ptr,
					      u16 start, u16 offset)
{
	skb->ip_summed = CHECKSUM_PARTIAL;
	skb->csum_start = ((unsigned char *)ptr + start) - skb->head;
	skb->csum_offset = offset - start;
}

/* Update skbuf and packet to reflect the remote checksum offload operation.
 * When called, ptr indicates the starting point for skb->csum when
 * ip_summed is CHECKSUM_COMPLETE. If we need create checksum complete
 * here, skb_postpull_rcsum is done so skb->csum start is ptr.
 */
static inline void skb_remcsum_process(struct sk_buff *skb, void *ptr,
				       int start, int offset, bool nopartial)
{
	__wsum delta;

if (!nopartial) {
		skb_remcsum_adjust_partial(skb, ptr, start, offset);
		return;
	}

if (unlikely(skb->ip_summed != CHECKSUM_COMPLETE)) {
		__skb_checksum_complete(skb);
		skb_postpull_rcsum(skb, skb->data, ptr - (void *)skb->data);
	}

delta = remcsum_adjust(ptr, skb->csum, start, offset);

/* Adjust skb->csum since we changed the packet */
	skb->csum = csum_add(skb->csum, delta);
}

static inline struct nf_conntrack *skb_nfct(const struct sk_buff *skb)
{
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
	return (void *)(skb->_nfct & NFCT_PTRMASK);
#else
	return NULL;
#endif
}

static inline unsigned long skb_get_nfct(const struct sk_buff *skb)
{
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
	return skb->_nfct;
#else
	return 0UL;
#endif
}

static inline void skb_set_nfct(struct sk_buff *skb, unsigned long nfct)
{
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
	skb->slow_gro |= !!nfct;
	skb->_nfct = nfct;
#endif
}

#ifdef CONFIG_SKB_EXTENSIONS
enum skb_ext_id {
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
	SKB_EXT_BRIDGE_NF,
#endif
#ifdef CONFIG_XFRM
	SKB_EXT_SEC_PATH,
#endif
#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
	TC_SKB_EXT,
#endif
#if IS_ENABLED(CONFIG_MPTCP)
	SKB_EXT_MPTCP,
#endif
	SKB_EXT_NUM, /* must be last */
};

/**
 *	struct skb_ext - sk_buff extensions
 *	@refcnt: 1 on allocation, deallocated on 0
 *	@offset: offset to add to @data to obtain extension address
 *	@chunks: size currently allocated, stored in SKB_EXT_ALIGN_SHIFT units
 *	@data: start of extension data, variable sized
 *
 *	Note: offsets/lengths are stored in chunks of 8 bytes, this allows
 *	to use 'u8' types while allowing up to 2kb worth of extension data.
 */
struct skb_ext {
	refcount_t refcnt;
	u8 offset[SKB_EXT_NUM]; /* in chunks of 8 bytes */
	u8 chunks;		/* same */
	char data[] __aligned(8);
};

struct skb_ext *__skb_ext_alloc(gfp_t flags);
void *__skb_ext_set(struct sk_buff *skb, enum skb_ext_id id,
		    struct skb_ext *ext);
void *skb_ext_add(struct sk_buff *skb, enum skb_ext_id id);
void __skb_ext_del(struct sk_buff *skb, enum skb_ext_id id);
void __skb_ext_put(struct skb_ext *ext);

static inline void skb_ext_put(struct sk_buff *skb)
{
	if (skb->active_extensions)
		__skb_ext_put(skb->extensions);
}

static inline void __skb_ext_copy(struct sk_buff *dst,
				  const struct sk_buff *src)
{
	dst->active_extensions = src->active_extensions;

if (src->active_extensions) {
		struct skb_ext *ext = src->extensions;

refcount_inc(&ext->refcnt);
		dst->extensions = ext;
	}
}

static inline void skb_ext_copy(struct sk_buff *dst, const struct sk_buff *src)
{
	skb_ext_put(dst);
	__skb_ext_copy(dst, src);
}

static inline bool __skb_ext_exist(const struct skb_ext *ext, enum skb_ext_id i)
{
	return !!ext->offset[i];
}

static inline bool skb_ext_exist(const struct sk_buff *skb, enum skb_ext_id id)
{
	return skb->active_extensions & (1 << id);
}

static inline void skb_ext_del(struct sk_buff *skb, enum skb_ext_id id)
{
	if (skb_ext_exist(skb, id))
		__skb_ext_del(skb, id);
}

static inline void *skb_ext_find(const struct sk_buff *skb, enum skb_ext_id id)
{
	if (skb_ext_exist(skb, id)) {
		struct skb_ext *ext = skb->extensions;

return (void *)ext + (ext->offset[id] << 3);
	}

return NULL;
}

static inline void skb_ext_reset(struct sk_buff *skb)
{
	if (unlikely(skb->active_extensions)) {
		__skb_ext_put(skb->extensions);
		skb->active_extensions = 0;
	}
}

static inline bool skb_has_extensions(struct sk_buff *skb)
{
	return unlikely(skb->active_extensions);
}
#else
static inline void skb_ext_put(struct sk_buff *skb) {}
static inline void skb_ext_reset(struct sk_buff *skb) {}
static inline void skb_ext_del(struct sk_buff *skb, int unused) {}
static inline void __skb_ext_copy(struct sk_buff *d, const struct sk_buff *s) {}
static inline void skb_ext_copy(struct sk_buff *dst, const struct sk_buff *s) {}
static inline bool skb_has_extensions(struct sk_buff *skb) { return false; }
#endif /* CONFIG_SKB_EXTENSIONS */

static inline void nf_reset_ct(struct sk_buff *skb)
{
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
	nf_conntrack_put(skb_nfct(skb));
	skb->_nfct = 0;
#endif
}

static inline void nf_reset_trace(struct sk_buff *skb)
{
#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) || IS_ENABLED(CONFIG_NF_TABLES)
	skb->nf_trace = 0;
#endif
}

static inline void ipvs_reset(struct sk_buff *skb)
{
#if IS_ENABLED(CONFIG_IP_VS)
	skb->ipvs_property = 0;
#endif
}

/* Note: This doesn't put any conntrack info in dst. */
static inline void __nf_copy(struct sk_buff *dst, const struct sk_buff *src,
			     bool copy)
{
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
	dst->_nfct = src->_nfct;
	nf_conntrack_get(skb_nfct(src));
#endif
#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) || IS_ENABLED(CONFIG_NF_TABLES)
	if (copy)
		dst->nf_trace = src->nf_trace;
#endif
}

static inline void nf_copy(struct sk_buff *dst, const struct sk_buff *src)
{
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
	nf_conntrack_put(skb_nfct(dst));
#endif
	dst->slow_gro = src->slow_gro;
	__nf_copy(dst, src, true);
}

#ifdef CONFIG_NETWORK_SECMARK
static inline void skb_copy_secmark(struct sk_buff *to, const struct sk_buff *from)
{
	to->secmark = from->secmark;
}

static inline void skb_init_secmark(struct sk_buff *skb)
{
	skb->secmark = 0;
}
#else
static inline void skb_copy_secmark(struct sk_buff *to, const struct sk_buff *from)
{ }

static inline void skb_init_secmark(struct sk_buff *skb)
{ }
#endif

static inline int secpath_exists(const struct sk_buff *skb)
{
#ifdef CONFIG_XFRM
	return skb_ext_exist(skb, SKB_EXT_SEC_PATH);
#else
	return 0;
#endif
}

static inline bool skb_irq_freeable(const struct sk_buff *skb)
{
	return !skb->destructor &&
		!secpath_exists(skb) &&
		!skb_nfct(skb) &&
		!skb->_skb_refdst &&
		!skb_has_frag_list(skb);
}

static inline void skb_set_queue_mapping(struct sk_buff *skb, u16 queue_mapping)
{
	skb->queue_mapping = queue_mapping;
}

static inline u16 skb_get_queue_mapping(const struct sk_buff *skb)
{
	return skb->queue_mapping;
}

static inline void skb_copy_queue_mapping(struct sk_buff *to, const struct sk_buff *from)
{
	to->queue_mapping = from->queue_mapping;
}

static inline void skb_record_rx_queue(struct sk_buff *skb, u16 rx_queue)
{
	skb->queue_mapping = rx_queue + 1;
}

static inline u16 skb_get_rx_queue(const struct sk_buff *skb)
{
	return skb->queue_mapping - 1;
}

static inline bool skb_rx_queue_recorded(const struct sk_buff *skb)
{
	return skb->queue_mapping != 0;
}

static inline void skb_set_dst_pending_confirm(struct sk_buff *skb, u32 val)
{
	skb->dst_pending_confirm = val;
}

static inline bool skb_get_dst_pending_confirm(const struct sk_buff *skb)
{
	return skb->dst_pending_confirm != 0;
}

static inline struct sec_path *skb_sec_path(const struct sk_buff *skb)
{
#ifdef CONFIG_XFRM
	return skb_ext_find(skb, SKB_EXT_SEC_PATH);
#else
	return NULL;
#endif
}

/* Keeps track of mac header offset relative to skb->head.
 * It is useful for TSO of Tunneling protocol. e.g. GRE.
 * For non-tunnel skb it points to skb_mac_header() and for
 * tunnel skb it points to outer mac header.
 * Keeps track of level of encapsulation of network headers.
 */
struct skb_gso_cb {
	union {
		int	mac_offset;
		int	data_offset;
	};
	int	encap_level;
	__wsum	csum;
	__u16	csum_start;
};
#define SKB_GSO_CB_OFFSET	32
#define SKB_GSO_CB(skb) ((struct skb_gso_cb *)((skb)->cb + SKB_GSO_CB_OFFSET))

static inline int skb_tnl_header_len(const struct sk_buff *inner_skb)
{
	return (skb_mac_header(inner_skb) - inner_skb->head) -
		SKB_GSO_CB(inner_skb)->mac_offset;
}

static inline int gso_pskb_expand_head(struct sk_buff *skb, int extra)
{
	int new_headroom, headroom;
	int ret;

headroom = skb_headroom(skb);
	ret = pskb_expand_head(skb, extra, 0, GFP_ATOMIC);
	if (ret)
		return ret;

new_headroom = skb_headroom(skb);
	SKB_GSO_CB(skb)->mac_offset += (new_headroom - headroom);
	return 0;
}

static inline void gso_reset_checksum(struct sk_buff *skb, __wsum res)
{
	/* Do not update partial checksums if remote checksum is enabled. */
	if (skb->remcsum_offload)
		return;

SKB_GSO_CB(skb)->csum = res;
	SKB_GSO_CB(skb)->csum_start = skb_checksum_start(skb) - skb->head;
}

/* Compute the checksum for a gso segment. First compute the checksum value
 * from the start of transport header to SKB_GSO_CB(skb)->csum_start, and
 * then add in skb->csum (checksum from csum_start to end of packet).
 * skb->csum and csum_start are then updated to reflect the checksum of the
 * resultant packet starting from the transport header-- the resultant checksum
 * is in the res argument (i.e. normally zero or ~ of checksum of a pseudo
 * header.
 */
static inline __sum16 gso_make_checksum(struct sk_buff *skb, __wsum res)
{
	unsigned char *csum_start = skb_transport_header(skb);
	int plen = (skb->head + SKB_GSO_CB(skb)->csum_start) - csum_start;
	__wsum partial = SKB_GSO_CB(skb)->csum;

SKB_GSO_CB(skb)->csum = res;
	SKB_GSO_CB(skb)->csum_start = csum_start - skb->head;

return csum_fold(csum_partial(csum_start, plen, partial));
}

static inline bool skb_is_gso(const struct sk_buff *skb)
{
	return skb_shinfo(skb)->gso_size;
}

/* Note: Should be called only if skb_is_gso(skb) is true */
static inline bool skb_is_gso_v6(const struct sk_buff *skb)
{
	return skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6;
}

/* Note: Should be called only if skb_is_gso(skb) is true */
static inline bool skb_is_gso_sctp(const struct sk_buff *skb)
{
	return skb_shinfo(skb)->gso_type & SKB_GSO_SCTP;
}

/* Note: Should be called only if skb_is_gso(skb) is true */
static inline bool skb_is_gso_tcp(const struct sk_buff *skb)
{
	return skb_shinfo(skb)->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6);
}

static inline void skb_gso_reset(struct sk_buff *skb)
{
	skb_shinfo(skb)->gso_size = 0;
	skb_shinfo(skb)->gso_segs = 0;
	skb_shinfo(skb)->gso_type = 0;
}

static inline void skb_increase_gso_size(struct skb_shared_info *shinfo,
					 u16 increment)
{
	if (WARN_ON_ONCE(shinfo->gso_size == GSO_BY_FRAGS))
		return;
	shinfo->gso_size += increment;
}

static inline void skb_decrease_gso_size(struct skb_shared_info *shinfo,
					 u16 decrement)
{
	if (WARN_ON_ONCE(shinfo->gso_size == GSO_BY_FRAGS))
		return;
	shinfo->gso_size -= decrement;
}

void __skb_warn_lro_forwarding(const struct sk_buff *skb);

static inline bool skb_warn_if_lro(const struct sk_buff *skb)
{
	/* LRO sets gso_size but not gso_type, whereas if GSO is really
	 * wanted then gso_type will be set. */
	const struct skb_shared_info *shinfo = skb_shinfo(skb);

if (skb_is_nonlinear(skb) && shinfo->gso_size != 0 &&
	    unlikely(shinfo->gso_type == 0)) {
		__skb_warn_lro_forwarding(skb);
		return true;
	}
	return false;
}

static inline void skb_forward_csum(struct sk_buff *skb)
{
	/* Unfortunately we don't support this one.  Any brave souls? */
	if (skb->ip_summed == CHECKSUM_COMPLETE)
		skb->ip_summed = CHECKSUM_NONE;
}

/**
 * skb_checksum_none_assert - make sure skb ip_summed is CHECKSUM_NONE
 * @skb: skb to check
 *
 * fresh skbs have their ip_summed set to CHECKSUM_NONE.
 * Instead of forcing ip_summed to CHECKSUM_NONE, we can
 * use this helper, to document places where we make this assertion.
 */
static inline void skb_checksum_none_assert(const struct sk_buff *skb)
{
#ifdef DEBUG
	BUG_ON(skb->ip_summed != CHECKSUM_NONE);
#endif
}

bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off);

int skb_checksum_setup(struct sk_buff *skb, bool recalculate);
struct sk_buff *skb_checksum_trimmed(struct sk_buff *skb,
				     unsigned int transport_len,
				     __sum16(*skb_chkf)(struct sk_buff *skb));

/**
 * skb_head_is_locked - Determine if the skb->head is locked down
 * @skb: skb to check
 *
 * The head on skbs build around a head frag can be removed if they are
 * not cloned.  This function returns true if the skb head is locked down
 * due to either being allocated via kmalloc, or by being a clone with
 * multiple references to the head.
 */
static inline bool skb_head_is_locked(const struct sk_buff *skb)
{
	return !skb->head_frag || skb_cloned(skb);
}

/* Local Checksum Offload.
 * Compute outer checksum based on the assumption that the
 * inner checksum will be offloaded later.
 * See Documentation/networking/checksum-offloads.rst for
 * explanation of how this works.
 * Fill in outer checksum adjustment (e.g. with sum of outer
 * pseudo-header) before calling.
 * Also ensure that inner checksum is in linear data area.
 */
static inline __wsum lco_csum(struct sk_buff *skb)
{
	unsigned char *csum_start = skb_checksum_start(skb);
	unsigned char *l4_hdr = skb_transport_header(skb);
	__wsum partial;

/* Start with complement of inner checksum adjustment */
	partial = ~csum_unfold(*(__force __sum16 *)(csum_start +
						    skb->csum_offset));

/* Add in checksum of our headers (incl. outer checksum
	 * adjustment filled in by caller) and return result.
	 */
	return csum_partial(l4_hdr, csum_start - l4_hdr, partial);
}

static inline bool skb_is_redirected(const struct sk_buff *skb)
{
	return skb->redirected;
}

static inline void skb_set_redirected(struct sk_buff *skb, bool from_ingress)
{
	skb->redirected = 1;
#ifdef CONFIG_NET_REDIRECT
	skb->from_ingress = from_ingress;
	if (skb->from_ingress)
		skb->tstamp = 0;
#endif
}

static inline void skb_reset_redirect(struct sk_buff *skb)
{
	skb->redirected = 0;
}

static inline bool skb_csum_is_sctp(struct sk_buff *skb)
{
	return skb->csum_not_inet;
}

static inline void skb_set_kcov_handle(struct sk_buff *skb,
				       const u64 kcov_handle)
{
#ifdef CONFIG_KCOV
	skb->kcov_handle = kcov_handle;
#endif
}

static inline u64 skb_get_kcov_handle(struct sk_buff *skb)
{
#ifdef CONFIG_KCOV
	return skb->kcov_handle;
#else
	return 0;
#endif
}

#ifdef CONFIG_PAGE_POOL
static inline void skb_mark_for_recycle(struct sk_buff *skb)
{
	skb->pp_recycle = 1;
}
#endif

static inline bool skb_pp_recycle(struct sk_buff *skb, void *data)
{
	if (!IS_ENABLED(CONFIG_PAGE_POOL) || !skb->pp_recycle)
		return false;
	return page_pool_return_skb_page(virt_to_page(data));
}

#endif	/* __KERNEL__ */
#endif	/* _LINUX_SKBUFF_H */

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