Linux and Windows, at least, when performing Local Checksum Offload
during Generic Segmentation Offload and at other times, place the one's
complement sum of the pseudo header in the checksum field, which
provides the necessary correction when a device (or its driver,
if not supported in hardware) computes the one's complement checksum
of each inner layer buffer in the skbuff. (This is why GSO requires
equal length buffers - so that the pseudo header contribution to
the checksum is the same.)
When performing our Internet checksum calculation, we can output
the partial sum of all but the last vector, which is an intermediate
result we calculate in the process anyway. The last vector is
generally the payload, and the previous vectors are for the pseudo
header. We can then compare this partial sum to the value in the
UDP or TCP header if the overall computed checksum isn't 0.
If it matches appropriately, we can have a more informative and
less scary message.
Update the tests a bit because this causes checksums to no longer
fail and be reported malformed in the http2 reassembly example.
Fix#18864. Related to #19109
Change all wireshark.org URLs to use https.
Fix some broken links while we're at it.
Change-Id: I161bf8eeca43b8027605acea666032da86f5ea1c
Reviewed-on: https://code.wireshark.org/review/34089
Reviewed-by: Guy Harris <guy@alum.mit.edu>
pointer truncation from 'const guint16 *' to 'unsigned long'.
Even if we only require GLIB 2.16 this will fix the Windows build as we do
have a newer Glib on Windows.
Change-Id: Ie0644536783e8b298de59094fec240e249c9b27f
Reviewed-on: https://code.wireshark.org/review/8833
Reviewed-by: Anders Broman <a.broman58@gmail.com>
Add macros to set entries of a vec_t, one for use when you have a
pointer to private data, and one for use when you have data in a tvbuff.
The latter wraps the use of tvb_get_ptr(), so that you're not directly
calling it in a dissector.
Move ip_checksum() to epan/in_cksum.c, and add an ip_checksum_tvb() that
wraps the use of tvb_get_ptr().
In the CARP dissector, give the length variable an unsigned type -
there's no benefit to it being signed, and that requires some casts to
be thrown around.
In the DCCP dissector, check only against the coverage length to see if
we have enough data, combine the "should we check the checksum?" check
with the "*can* we check the checksum?" check in a single if, and throw
a dissector assertion if the source network address type isn't IPv4 or
IPv6.
Get rid of inclues of <epan/in_cksum.h> in dissectors that don't use any
of the Internet checksum routines.
In the HIP dissector, make sure we have the data to calculate the
checksum before doing so.
Change-Id: I2f9674775dbb54c533d33082632809f7d32ec8ae
Reviewed-on: https://code.wireshark.org/review/3517
Reviewed-by: Guy Harris <guy@alum.mit.edu>
(Using sed : sed -i '/^ \* \$Id\$/,+1 d')
Fix manually some typo (in export_object_dicom.c and crc16-plain.c)
Change-Id: I4c1ae68d1c4afeace8cb195b53c715cf9e1227a8
Reviewed-on: https://code.wireshark.org/review/497
Reviewed-by: Anders Broman <a.broman58@gmail.com>
result from the ADDCARRY portion of the REDUCE macro.
-#define ADDCARRY(x) (x > 65535 ? x -= 65535 : x)
+#define ADDCARRY(x) {if ((x) > 65535) (x) -= 65535;}
The new code is from in_cksum.c in the Tahoe/CGI port of 4.4BSD-Lite2 (we're
using the "Portable Version" copy otherwise).
svn path=/trunk/; revision=35589
John Thacker