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Eric Dumazet 3e67f106f6 inet: frags: break the 2GB limit for frags storage 
Some users are willing to provision huge amounts of memory to be able
to perform reassembly reasonnably well under pressure.

Current memory tracking is using one atomic_t and integers.

Switch to atomic_long_t so that 64bit arches can use more than 2GB,
without any cost for 32bit arches.

Note that this patch avoids an overflow error, if high_thresh was set
to ~2GB, since this test in inet_frag_alloc() was never true :

if (... || frag_mem_limit(nf) > nf->high_thresh)

Tested:

$ echo 16000000000 >/proc/sys/net/ipv4/ipfrag_high_thresh

<frag DDOS>

$ grep FRAG /proc/net/sockstat
FRAG: inuse 14705885 memory 16000002880

$ nstat -n ; sleep 1 ; nstat | grep Reas
IpReasmReqds                    3317150            0.0
IpReasmFails                    3317112            0.0

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2018-03-31 23:25:39 -04:00
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ABI Merge branch 'for-4.16-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2018-03-19 14:23:30 -07:00
EDID
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PCI PCI: Update location of pci.ids file 2018-02-22 15:00:43 -06:00
RCU
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accelerators ocxl: Document the OCXL_IOCTL_GET_METADATA IOCTL 2018-03-02 13:02:15 +11:00
accounting
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acpi
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admin-guide More ACPI updates for v4.16-rc1 2018-02-09 09:44:25 -08:00
aoe
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arm
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arm64
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auxdisplay
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backlight
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blackfin
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block
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blockdev
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bpf bpf, doc: add description wrt native/bpf clang target and pointer size 2018-03-20 15:47:45 -07:00
bus-devices
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cdrom
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cgroup-v1
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cma
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connector
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console
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core-api idr: Add documentation 2018-02-06 16:41:29 -05:00
cpu-freq cpufreq: Add and use cpufreq_for_each_{valid_,}entry_idx() 2018-02-08 10:21:39 +01:00
cpuidle
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cris
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crypto
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dev-tools
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device-mapper
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devicetree dt-bindings: net: meson-dwmac: add support for the Meson8m2 SoC 2018-03-31 22:17:23 -04:00
doc-guide
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driver-api
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driver-model
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early-userspace
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extcon
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fault-injection
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fb
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features membarrier-sync-core: Document architecture support 2018-02-10 12:45:10 +01:00
filesystems afs: Support the AFS dynamic root 2018-02-06 14:43:37 +00:00
firmware_class
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fmc
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fpga
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frv
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gpio
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gpu Fixes for 4.16. I contains fixes for deadlock on runtime suspend on few 2018-02-22 08:39:26 +10:00
hid
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hwmon
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i2c i2c: i801: Add missing documentation entries for Braswell and Kaby Lake 2018-02-21 09:17:20 +01:00
ia64 ia64: doc: tweak whitespace for 'console=' parameter 2018-03-05 14:41:38 -08:00
ide
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iio
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infiniband IB: Update references to libibverbs 2018-02-04 11:56:49 -05:00
input
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ioctl
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isdn
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kbuild
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kdump
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kernel-hacking
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laptops
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leds
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lightnvm
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livepatch
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locking Documentation/locking/mutex-design: Update to reflect latest changes 2018-02-11 12:28:58 +01:00
m68k
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maintainer
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md
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media media: dvb: add continuity error indicators for memory mapped buffers 2018-02-23 05:28:41 -05:00
memory-devices
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metag
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mic
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mips
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misc-devices
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mmc
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mn10300
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mtd
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namespaces
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netlabel
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networking inet: frags: break the 2GB limit for frags storage 2018-03-31 23:25:39 -04:00
nfc
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nios2
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nvdimm
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nvmem
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openrisc
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parisc
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pcmcia
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perf
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phy
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platform
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power
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powerpc
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pps
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process A few late-arriving fixes, along with Konstantin's PGP document that had 2018-02-07 09:42:59 -08:00
pti
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ptp ptp: Fix documentation to match code. 2018-03-26 12:13:21 -04:00
rapidio
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s390
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scheduler
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scsi
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security
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serial
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sh
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sound
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sparc
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sphinx Documentation/sphinx: Fix Directive import error 2018-03-09 10:46:14 -07:00
sphinx-static
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spi
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sysctl net: do not create fallback tunnels for non-default namespaces 2018-03-09 11:23:11 -05:00
target
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thermal
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timers
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trace
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translations
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usb
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userspace-api
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virtual KVM: x86: Add a framework for supporting MSR-based features 2018-03-01 19:00:28 +01:00
vm
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w1
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watchdog documentation: watchdog: remove documentation of w83697hf_wdt/w83697ug_wdt 2018-02-03 11:09:54 +01:00
wimax
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x86 Documentation, x86, resctrl: Make text and sample command match 2018-02-28 19:59:05 +01:00
xtensa
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.gitignore
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00-INDEX
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Changes
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CodingStyle
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DMA-API-HOWTO.txt
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DMA-API.txt
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DMA-ISA-LPC.txt
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DMA-attributes.txt
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IPMI.txt
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IRQ-affinity.txt
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IRQ-domain.txt
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IRQ.txt
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Intel-IOMMU.txt
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Makefile
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SAK.txt
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SM501.txt
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SubmittingPatches
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atomic_bitops.txt locking/atomic/bitops: Document and clarify ordering semantics for failed test_and_{}_bit() 2018-02-13 14:55:53 +01:00
atomic_t.txt
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bcache.txt
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bt8xxgpio.txt
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btmrvl.txt
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bus-virt-phys-mapping.txt
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cachetlb.txt
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cgroup-v2.txt
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circular-buffers.txt
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clearing-warn-once.txt
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clk.txt
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conf.py
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cpu-load.txt
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cputopology.txt
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crc32.txt
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dcdbas.txt
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debugging-modules.txt
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debugging-via-ohci1394.txt
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dell_rbu.txt
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digsig.txt
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docutils.conf
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dontdiff
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efi-stub.txt
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eisa.txt
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flexible-arrays.txt
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futex-requeue-pi.txt
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gcc-plugins.txt
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highuid.txt
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hw_random.txt
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hwspinlock.txt
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index.rst
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intel_txt.txt
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io-mapping.txt
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io_ordering.txt
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iostats.txt
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irqflags-tracing.txt
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isa.txt
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isapnp.txt
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kernel-per-CPU-kthreads.txt
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kobject.txt
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kprobes.txt
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kref.txt
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ldm.txt
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lockup-watchdogs.txt
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logo.gif
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logo.txt
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lsm.txt
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lzo.txt
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mailbox.txt
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memory-barriers.txt
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memory-hotplug.txt
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men-chameleon-bus.txt
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nommu-mmap.txt
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ntb.txt
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numastat.txt
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padata.txt
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parport-lowlevel.txt
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percpu-rw-semaphore.txt
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phy.txt
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pi-futex.txt
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pnp.txt
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preempt-locking.txt
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pwm.txt
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rbtree.txt
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remoteproc.txt
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rfkill.txt
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robust-futex-ABI.txt
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robust-futexes.txt
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rpmsg.txt
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rtc.txt
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sgi-ioc4.txt
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siphash.txt
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smsc_ece1099.txt
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speculation.txt
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static-keys.txt
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svga.txt
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switchtec.txt
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sync_file.txt
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tee.txt
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this_cpu_ops.txt
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unaligned-memory-access.txt
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vfio-mediated-device.txt
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vfio.txt
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video-output.txt
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xillybus.txt
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xz.txt
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zorro.txt
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