There were ultimately two separate problems here:
- a 32-bit long cannot represent microseconds since 1970 (noted by ian)
- time_t is 32-bit on i386, so now() was wrong anyways even with the correct
return type.
For the first, just explicitly use a uint64_t for now() and all of the
callers. For the second, we need to explicitly cast tv_sec to uint64_t
before it gets multiplied in the SEC_TO_US macro. Casting this instance
rather than generally in the macro was arbitrarily chosen simply because all
other uses are converting small relative time values.
The tests now pass on i386, at least; presumably other ILP32 will be fine
now as well.
We used to have a problem where bridges created in different vnet jails
would end up having the same mac address. This is now fixed by
including the jail name as a seed for the mac address generation, but we
should verify that it doesn't regress.
Originally noticed while attempting to run the kqueue tests under
qemu-user-static, this apparently just happens sometimes when running in a
jail in general -- the timer will fire off "too early," but it's really just
the result of imprecise measurements (noted by cem).
Kicking this over to NOTE_USECONDS still tests the correct thing while
allowing it to work more consistently; a basic sanity test reveals that we
often end up coming in just less than 200 microseconds after the timer
fired off.
MFC after: 3 days
closefrom has been converted to close_range internally; remediation is
underway for this, marking it as an expected fail for now while proper
course is determined.
PR: 245625
Similar to mmap'ing vnodes, posixshm should count any mapping where maxprot
contains VM_PROT_WRITE (i.e. fd opened r/w with no write-seal applied) as
writable and thus blocking of any write-seal.
The memfd tests have been amended to reflect the fixes here, which notably
includes:
1. Fix for error return bug; EPERM is not a documented failure mode for mmap
2. Fix rejection of write-seal with active mappings that can be upgraded via
mprotect(2).
Reported by: markj
Discussed with: markj, kib
close_range will clamp the range between [0, fdp->fd_lastfile], but failed
to take into account that fdp->fd_lastfile can become -1 if all fds are
closed. =-( In this scenario, just return because there's nothing further we
can do at the moment.
Add a test case for this, fork() and simply closefrom(0) twice in the child;
on the second invocation, fdp->fd_lastfile == -1 and will trigger a panic
before this change.
X-MFC-With: r359836
close_range(min, max, flags) allows for a range of descriptors to be
closed. The Python folk have indicated that they would much prefer this
interface to closefrom(2), as the case may be that they/someone have special
fds dup'd to higher in the range and they can't necessarily closefrom(min)
because they don't want to hit the upper range, but relocating them to lower
isn't necessarily feasible.
sys_closefrom has been rewritten to use kern_close_range() using ~0U to
indicate closing to the end of the range. This was chosen rather than
requiring callers of kern_close_range() to hold FILEDESC_SLOCK across the
call to kern_close_range for simplicity.
The flags argument of close_range(2) is currently unused, so any flags set
is currently EINVAL. It was added to the interface in Linux so that future
flags could be added for, e.g., "halt on first error" and things of this
nature.
This patch is based on a syscall of the same design that is expected to be
merged into Linux.
Reviewed by: kib, markj, vangyzen (all slightly earlier revisions)
Differential Revision: https://reviews.freebsd.org/D21627
Set up three vnet jails, bridged together. Run carp between two of them.
Attempt to provoke locking / epoch issues.
Reviewed by: mav (previous version), melifaro, asomers
Differential Revision: https://reviews.freebsd.org/D24303
vnode_fd and kqfd are both shared among multiple CU; define them exactly
once.
In the case of vnode_fd, it was simply the declaration that needed
correction.
-fno-common will become the default in GCC10/LLVM11.
MFC after: 3 days
Many rtsock tests verify the ordering of the kernel messages for the
particular event. In order to avoid flaky tests due to the other tests
running, switch all tests to use personal vnet-enabled jails.
This removes all clashes on the IP addresses and brings back the ability
to run these tests simultaneously.
Reported by: olivier
Reviewed by: olivier
Differential Revision: https://reviews.freebsd.org/D24182
- The linked list of cryptoini structures used in session
initialization is replaced with a new flat structure: struct
crypto_session_params. This session includes a new mode to define
how the other fields should be interpreted. Available modes
include:
- COMPRESS (for compression/decompression)
- CIPHER (for simply encryption/decryption)
- DIGEST (computing and verifying digests)
- AEAD (combined auth and encryption such as AES-GCM and AES-CCM)
- ETA (combined auth and encryption using encrypt-then-authenticate)
Additional modes could be added in the future (e.g. if we wanted to
support TLS MtE for AES-CBC in the kernel we could add a new mode
for that. TLS modes might also affect how AAD is interpreted, etc.)
The flat structure also includes the key lengths and algorithms as
before. However, code doesn't have to walk the linked list and
switch on the algorithm to determine which key is the auth key vs
encryption key. The 'csp_auth_*' fields are always used for auth
keys and settings and 'csp_cipher_*' for cipher. (Compression
algorithms are stored in csp_cipher_alg.)
- Drivers no longer register a list of supported algorithms. This
doesn't quite work when you factor in modes (e.g. a driver might
support both AES-CBC and SHA2-256-HMAC separately but not combined
for ETA). Instead, a new 'crypto_probesession' method has been
added to the kobj interface for symmteric crypto drivers. This
method returns a negative value on success (similar to how
device_probe works) and the crypto framework uses this value to pick
the "best" driver. There are three constants for hardware
(e.g. ccr), accelerated software (e.g. aesni), and plain software
(cryptosoft) that give preference in that order. One effect of this
is that if you request only hardware when creating a new session,
you will no longer get a session using accelerated software.
Another effect is that the default setting to disallow software
crypto via /dev/crypto now disables accelerated software.
Once a driver is chosen, 'crypto_newsession' is invoked as before.
- Crypto operations are now solely described by the flat 'cryptop'
structure. The linked list of descriptors has been removed.
A separate enum has been added to describe the type of data buffer
in use instead of using CRYPTO_F_* flags to make it easier to add
more types in the future if needed (e.g. wired userspace buffers for
zero-copy). It will also make it easier to re-introduce separate
input and output buffers (in-kernel TLS would benefit from this).
Try to make the flags related to IV handling less insane:
- CRYPTO_F_IV_SEPARATE means that the IV is stored in the 'crp_iv'
member of the operation structure. If this flag is not set, the
IV is stored in the data buffer at the 'crp_iv_start' offset.
- CRYPTO_F_IV_GENERATE means that a random IV should be generated
and stored into the data buffer. This cannot be used with
CRYPTO_F_IV_SEPARATE.
If a consumer wants to deal with explicit vs implicit IVs, etc. it
can always generate the IV however it needs and store partial IVs in
the buffer and the full IV/nonce in crp_iv and set
CRYPTO_F_IV_SEPARATE.
The layout of the buffer is now described via fields in cryptop.
crp_aad_start and crp_aad_length define the boundaries of any AAD.
Previously with GCM and CCM you defined an auth crd with this range,
but for ETA your auth crd had to span both the AAD and plaintext
(and they had to be adjacent).
crp_payload_start and crp_payload_length define the boundaries of
the plaintext/ciphertext. Modes that only do a single operation
(COMPRESS, CIPHER, DIGEST) should only use this region and leave the
AAD region empty.
If a digest is present (or should be generated), it's starting
location is marked by crp_digest_start.
Instead of using the CRD_F_ENCRYPT flag to determine the direction
of the operation, cryptop now includes an 'op' field defining the
operation to perform. For digests I've added a new VERIFY digest
mode which assumes a digest is present in the input and fails the
request with EBADMSG if it doesn't match the internally-computed
digest. GCM and CCM already assumed this, and the new AEAD mode
requires this for decryption. The new ETA mode now also requires
this for decryption, so IPsec and GELI no longer do their own
authentication verification. Simple DIGEST operations can also do
this, though there are no in-tree consumers.
To eventually support some refcounting to close races, the session
cookie is now passed to crypto_getop() and clients should no longer
set crp_sesssion directly.
- Assymteric crypto operation structures should be allocated via
crypto_getkreq() and freed via crypto_freekreq(). This permits the
crypto layer to track open asym requests and close races with a
driver trying to unregister while asym requests are in flight.
- crypto_copyback, crypto_copydata, crypto_apply, and
crypto_contiguous_subsegment now accept the 'crp' object as the
first parameter instead of individual members. This makes it easier
to deal with different buffer types in the future as well as
separate input and output buffers. It's also simpler for driver
writers to use.
- bus_dmamap_load_crp() loads a DMA mapping for a crypto buffer.
This understands the various types of buffers so that drivers that
use DMA do not have to be aware of different buffer types.
- Helper routines now exist to build an auth context for HMAC IPAD
and OPAD. This reduces some duplicated work among drivers.
- Key buffers are now treated as const throughout the framework and in
device drivers. However, session key buffers provided when a session
is created are expected to remain alive for the duration of the
session.
- GCM and CCM sessions now only specify a cipher algorithm and a cipher
key. The redundant auth information is not needed or used.
- For cryptosoft, split up the code a bit such that the 'process'
callback now invokes a function pointer in the session. This
function pointer is set based on the mode (in effect) though it
simplifies a few edge cases that would otherwise be in the switch in
'process'.
It does split up GCM vs CCM which I think is more readable even if there
is some duplication.
- I changed /dev/crypto to support GMAC requests using CRYPTO_AES_NIST_GMAC
as an auth algorithm and updated cryptocheck to work with it.
- Combined cipher and auth sessions via /dev/crypto now always use ETA
mode. The COP_F_CIPHER_FIRST flag is now a no-op that is ignored.
This was actually documented as being true in crypto(4) before, but
the code had not implemented this before I added the CIPHER_FIRST
flag.
- I have not yet updated /dev/crypto to be aware of explicit modes for
sessions. I will probably do that at some point in the future as well
as teach it about IV/nonce and tag lengths for AEAD so we can support
all of the NIST KAT tests for GCM and CCM.
- I've split up the exising crypto.9 manpage into several pages
of which many are written from scratch.
- I have converted all drivers and consumers in the tree and verified
that they compile, but I have not tested all of them. I have tested
the following drivers:
- cryptosoft
- aesni (AES only)
- blake2
- ccr
and the following consumers:
- cryptodev
- IPsec
- ktls_ocf
- GELI (lightly)
I have not tested the following:
- ccp
- aesni with sha
- hifn
- kgssapi_krb5
- ubsec
- padlock
- safe
- armv8_crypto (aarch64)
- glxsb (i386)
- sec (ppc)
- cesa (armv7)
- cryptocteon (mips64)
- nlmsec (mips64)
Discussed with: cem
Relnotes: yes
Sponsored by: Chelsio Communications
Differential Revision: https://reviews.freebsd.org/D23677
Change type of variable used in setsocketopt so correct size of
option is passed.
Test failure was identified when running the test on PowerPC64,
and the following error message was seen:
"bind () failed: Address already in use"
Submitted by: Fernando Valle <fernando.valle@eldorado.org.br>
Reviewed by: melifaro, adalava
Approved by: jhibbits (mentor)
Sponsored by: Eldorado Research Institute (eldorado.org.br)
Differential Revision: https://reviews.freebsd.org/D24164
The FUSE protocol allows the client (kernel) to cache a file's size, if the
server (userspace daemon) allows it. A well-behaved daemon obviously should
not change a file's size while a client has it cached. But a buggy daemon
might. If the kernel ever detects that that has happened, then it should
invalidate the entire cache for that file. Previously, we would not only
cache stale data, but in the case of a file extension while we had the size
cached, we accidentally extended the cache with zeros.
PR: 244178
Reported by: Ben RUBSON <ben.rubson@gmx.com>
Reviewed by: cem
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D24012
Basic test case where we create a bridge loop, verify that we really are
looping and then enable spanning tree to resolve the loop.
Reviewed by: philip
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D23959
We were reusing a structure for multiple operations, but failing to
reinitialize one member. The result is that a server that cares about FUSE
file handle IDs would see one correct FUSE_FSYNC operation, and one with the
FHID unset.
PR: 244431
Reported by: Agata <chogata@gmail.com>
MFC after: 2 weeks
Very basic bridge test: Set up two jails and test that they can pass IPv4
traffic over the bridge.
Reviewed by: melifaro, philip
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D23697
As with the rest of pjdfstest, tag the symlink with package=tests.
The tests -> . symlink seems a little strange but that's independent
of pkgbase.
Sponsored by: The FreeBSD Foundation
kldload() returns a positive integer when it loads a ko, so check that the
return value is -1 to detect error cases, not that it's different from zero.
MFC after: 3 days
X-MFC-With: r357234
kldload() returns an error (EEXIST) if the module is already loaded.
That's not a problem for us, so ignore that error.
While here also clean up include statements.
MFC after: 3 days
X-MFC-With: r357234
The horrific GENRAND construction bent over backwards to construct 64-bit
signed integers from the 31-bit output of random(3) for about 20 numbers per
test. Reproducibility wasn't a goal: random(3) was seeded with
srandomdev(3). Speed is not a factor for generating 20 integers with
arc4random(3). Range is not a factor: all uses did not bound the range
beyond that of the full [INT64_MIN, INT64_MAX]. Just use arc4random(3).
Reported by: Coverity
CIDs: 1404809, 1404817, 1404838, 1404840 and about 6x other
identical reports of dubious code relating to the
construction
if_epair abused the ifr_data field to insert its second interface in
IFC_IFLIST. If userspace provides a value for ifr_data it would get
dereferenced by the kernel leading to a panic.
Reported by: Ilja Van Sprundel <ivansprundel@ioactive.com>
MFC after: 3 days
The routing subdirectory installed into the same directory as the test tests,
which caused them to overwrite the net Kyuafile. As a result these tests were
not executed.
X-MFC-With: r356146
Redirect (and temporal) route expiration was broken a while ago.
This change brings route expiration back, with unified IPv4/IPv6 handling code.
It introduces net.inet.icmp.redirtimeout sysctl, allowing to set
an expiration time for redirected routes. It defaults to 10 minutes,
analogues with net.inet6.icmp6.redirtimeout.
Implementation uses separate file, route_temporal.c, as route.c is already
bloated with tons of different functions.
Internally, expiration is implemented as an per-rnh callout scheduled when
route with non-zero rt_expire time is added or rt_expire is changed.
It does not add any overhead when no temporal routes are present.
Callout traverses entire routing tree under wlock, scheduling expired routes
for deletion and calculating the next time it needs to be run. The rationale
for such implemention is the following: typically workloads requiring large
amount of routes have redirects turned off already, while the systems with
small amount of routes will not inhibit large overhead during tree traversal.
This changes also fixes netstat -rn display of route expiration time, which
has been broken since the conversion from kread() to sysctl.
Reviewed by: bz
MFC after: 3 weeks
Differential Revision: https://reviews.freebsd.org/D23075
Linux expects to be able to use posix_fallocate(2) on a memfd. Other places
would use this with shm_open(2) to act as a smarter ftruncate(2).
Test has been added to go along with this.
Reviewed by: kib (earlier version)
Differential Revision: https://reviews.freebsd.org/D23042
This re-enables building the googletest suite by default on mips and instead
specifically doesn't build fusefs tests for mips+clang builds. clang will
easily spent >= 1.5 hours compiling a single file due to a bug in
optimization (see LLVM PR 43263), so turn these off for now while that's
hashed out.
GCC builds are unaffected and build the fusefs tests as-is. Clang builds
only happen by early adopters attempting to hash out the remaining issues.
The comment has been updated to reflect its new position and use less strong
wording about imposing on people.
Discussed with: ngie, asomers
Reviewed by: ngie
Add ATF tests for most gmultipath operations. Add some dtrace probes too,
primarily for configuration changes that happen in response to provider
errors.
PR: 178473
MFC after: 2 weeks
Sponsored by: Axcient
Differential Revision: https://reviews.freebsd.org/D22235
The debugger like truss(1) depends on the wait(2) syscall. This syscall
waits for ALL children. When it is waiting for ALL child's the children
created by process descriptors are not returned. This behavior was
introduced because we want to implement libraries which may pdfork(1).
The behavior of process descriptor brakes truss(1) because it will
not be able to collect the status of processes with process descriptors.
To address this problem the status is returned to parent when the
child is traced. While the process is traced the debugger is the new parent.
In case the original parent and debugger are the same process it means the
debugger explicitly used pdfork() to create the child. In that case the debugger
should be using kqueue()/pdwait() instead of wait().
Add test case to verify that. The test case was implemented by markj@.
Reviewed by: kib, markj
Discussed with: jhb
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D20362
We have -Werror=strict-overflow so gcc complains:
In file included from /tmp/obj/workspace/src/amd64.amd64/tmp/usr/include/bitstring.h:36:0,
from /workspace/src/tests/sys/sys/bitstring_test.c:34:
/workspace/src/tests/sys/sys/bitstring_test.c: In function 'bit_ffc_at_test':
/workspace/src/sys/sys/bitstring.h:239:5: error: assuming signed overflow does not occur when assuming that (X + c) >= X is always true [-Werror=strict-overflow]
if (_start >= _nbits) {
^
Disable assuming overflow of signed integer will never happen by specifying
-fno-strict-overflow
Sponsored by: The FreeBSD Foundation
should identify accurately which function exhibited the bug.
Reviewed by: asomers
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D22519
r354991 removed variable-sized object initializing on defining. For the safe
reason, manually initialize the members to 0.
Sponsored by: The FreeBSD Foundation
Add bit_ffs_area_at and bit_ffc_area_at functions for searching a bit
string for a sequence of contiguous set or unset bits of at least the
specified size.
The bit_ffc_area function will be used by the Intel ice driver for
implementing resource assignment logic using a bitstring to represent
whether or not a given index has been assigned or is currently free.
The bit_ffs_area, bit_ffc_area_at and bit_ffs_area_at functions are
implemented for completeness.
I'd like to add further test cases for the new functions, but I'm not
really sure how to add them easily. The new functions depend on specific
sequences of bits being set, while the bitstring tests appear to run for
varying bit sizes.
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Submitted by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed by: asomers@, erj@
MFC after: 1 week
Sponsored by: Intel Corporation
Differential Revision: https://reviews.freebsd.org/D22400
bit_ffs_at and bit_ffc_at both take _start parameters which indicate to
start searching from _start onwards.
If the given _start index is past the size of the bit string, these
functions will calculate an address of the current bitstring which is
after the expected size. The function will also dereference the memory,
resulting in a read buffer overflow.
The output of the function remains correct, because the tests ensure to
stop the loop if the current bitstring chunk passes the stop bitstring
chunk, and because of a check to ensure the reported _value is never
past _nbits.
However, if <sys/bitstring.h> is ever used in code which is checked by
-fsanitize=undefined, or similar static analysis, it can produce
warnings about reading past the buffer size.
Because of the above mentioned checks, these buffer overflows do not
occur as long as _start is less than _nbits. Additionally, by definition
bit_ffs_at and bif_ffc_at should set _result to -1 in any case where the
_start is after the _nbits.
Check for this case at the start of the function and exit early if so,
preventing the buffer read overflow, and reducing the amount of
computation that occurs.
Note that it may seem odd to ever have code that could call bit_ffc_at
or bit_ffs_at with a _start value greater than _nbits. However, consider
a for-loop that used bit_ffs and bit_ffs_at to loop over a bit string
and perform some operation on each bit that was set. If the last bit of
the bit string was set, the simplest loop implementation would call
bit_ffs_at with a start of _nbits, and expect that to return -1. While
it does infact perform correctly, this is what ultimately triggers the
unexpected buffer read overflow.
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Submitted by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed by: asomers@, erj@
MFC after: 1 week
Sponsored by: Intel Corporation
Differential Revision: https://reviews.freebsd.org/D22398
After r354748 mld_input() can change the mbuf. The new pointer
is never returned to icmp6_input() and when passed to
icmp6_rip6_input() the mbuf may no longer valid leading to
a panic.
Pass a pointer to the mbuf to mld_input() so we can return an
updated version in the non-error case.
Add a test sending an MLD packet case which will trigger this bug.
Pointyhat to: bz
Reported by: gallatin, thj
MFC After: 2 weeks
X-MFC with: r354748
Sponsored by: Netflix
Co-mingling two things here:
* Addressing some feedback from Konstantin and Kyle re: jail,
capability mode, and a few other things
* Adding audit support as promised.
The audit support change includes a partial refresh of OpenBSM from
upstream, where the change to add shm_rename has already been
accepted. Matthew doesn't plan to work on refreshing anything else to
support audit for those new event types.
Submitted by: Matthew Bryan <matthew.bryan@isilon.com>
Reviewed by: kib
Relnotes: Yes
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D22083
RFC 8200 says:
"If the fragment is a whole datagram (that is, both the Fragment
Offset field and the M flag are zero), then it does not need
any further reassembly and should be processed as a fully
reassembled packet (i.e., updating Next Header, adjust Payload
Length, removing the Fragment header, etc.). .."
That means we should remove the fragment header and make all the adjustments
rather than just skipping over the fragment header. The difference should
be noticeable in that a properly handled atomic fragment triggering an ICMPv6
message at an upper layer (e.g. dest unreach, unreachable port) will not
include the fragment header.
Update the test cases to also test for an unfragmentable part. That is
needed so that the next header is properly updated (not just lengths).
MFC after: 3 weeks
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D22155
Remove mentions of fragmentation tests from extension header test.
Remove setting an MTU > IF_MAXMTU from the test cases to avoid warnings;
this was only possible in a local research tree.
MFC after: 2 weeks
Sponsored by: Netflix
Add a simple test case which can exercise some of the IPv6 extension
header code paths. At the moment only a small set of extension headers
is implemented and no options to the ones which take them.
Also implements a "bad" case to make sure that error handling works.
The tests were used to test m_pullup() changes to the code paths while
removing the KAME PULLDOWN_TEST cases and related macros.
MFC after: 3 weeks
Sponsored by: Netflix
There are times when we have to wait for reply packets. There are
either an ICMPv6 (error) reply or the expiration timeout.
In these cases synchonous ICMPv6 replies should arrive, always,
unless the packet is lost. Due to errors experienced with the
test software sending an invlaid request on at least i386 (*) these
packets are not generated. That means we are waiting for a long time
for the replies or even timeout the test case.
Manually set the "End" flag on these test cases as well, so they do
fail rather than timeout as the sniffer timeout happens. This improves
debugging options, reflects the error properly, and saves time on each
test suit run.
(*) The real cause for that is still to be found (see the referenced PRs)
PR: 241493, 239380
MFC after: 2 weeks
Sponsored by: Netflix
stderr:
Traceback (most recent call last):
File "/usr/tests/sys/netpfil/common/pft_ping.py", line 135, in <module>
main()
File "/usr/tests/sys/netpfil/common/pft_ping.py", line 124, in main
ping(args.sendif[0], args.to[0], args)
File "/usr/tests/sys/netpfil/common/pft_ping.py", line 74, in ping
raw = sp.raw(str(PAYLOAD_MAGIC))
File "/usr/local/lib/python3.6/site-packages/scapy/compat.py", line 52, in raw
return bytes(x)
TypeError: string argument without an encoding
MFC with: r354121
Sponsored by: The FreeBSD Foundation
In order to move python2 out of the test framework to avoid py2 vs. py3
confusions upgrade the remaining test cases using scapy to work with py3.
That means only one version of scapy needs to be installed in the CI system.
It also gives a path forward for testing i386 issues observed in the CI
system with some of these tests.
Fixes are:
- Use default python from environment (which is 3.x these days).
- properly ident some lines as common for the rest of the file to avoid
errors.
- cast the calculated offset to an int as the division result is considered
a float which is not accepted input.
- when comparing payload to a magic number make sure we always add the
payload properly to the packet and do not try to compare string in
the result but convert the data payload back into an integer.
- fix print formating.
Discussed with: lwhsu, kp (taking it off his todo :)
MFC after: 2 weeks
The change to conform to RFC 8200 for overlapping fragments now frees
the entire reassembly queue if the overlapping fragments are not an
exact match.
As a result we do see one less packet in the timeout statistics from
expiry. No other statistics change as the event is not counted.
It can be argued that we should improve the statistics counters in
that case.
This test case update should have been committed alongside the original
commit.
Pointyhat to: bz
MFC after: 3 weeks
X-MFC with: r354046
Sponsored by: Netflix
When we receive the packet with the first fragmented part (fragoff=0)
we remember the length of the unfragmentable part and the next header
(and should probably also remember ECN) as meta-data on the reassembly
queue.
Someone replying this packet so far could change these 2 (3) values.
While changing the next header seems more severe, for a full size
fragmented UDP packet, for example, adding an extension header to the
unfragmentable part would go unnoticed (as the framented part would be
considered an exact duplicate) but make reassembly fail.
So do not allow updating the meta-data after we have seen the first
fragmented part anymore.
The frag6_20 test case is added which failed before triggering an
ICMPv6 "param prob" due to the check for each queued fragment for
a max-size violation if a fragoff=0 packet was received.
MFC after: 3 weeks
Sponsored by: Netflix
