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The mm_len member of struct ring is of type size_t, but in the code
paths leading to set it, unsigned int is used. In circumstances where
unsigned int is 32 bit and size_t is 64 bit, this could lead to an
integer overflow, which causes an improper ring size being mmap()'ed in
mmap_ring_generic().
In order to prevent this, consistently use size_t to store the ring
size, since this is also what mmap() takes as its `length' parameter.
This now allows to specify ring sizes larger than 4 GiB for both
netsniff-ng and trafgen (fixes #90).
Reported-by: Jon Schipp <jonschipp@gmail.com>
Reported-by: Michał Purzyński <michalpurzynski1@gmail.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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These are not needed in the headers themselves and are pulled in in the
.c file where necessary.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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In netsniff-ng, we use tpacketv3 for capturing-only mode. The issue
observed lately is that when using f.e. -n10 or capturing a pcap and
then quitting, the pcap or actually seen number of packets are less
than what the statistics tell us from getsockopt(2).
This is due to the fact that tpacketv3 divides its ring buffer into
blocks of frames. Meaning, while we are traversing block n, the kernel
already fills up block n+1 and following if new packets arrive. While
doing so, it increments packet counters. Thus, when we ^C, we haven't
seen those blocks, so the stats tell us mostly a slightly higher
result. Fix this by adjusting socket stats printing to this fact.
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
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Finally eliminate xutils.{c,h} and move the rest to epoll2.
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
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We need to carry frame_count through multiple calls of walk function
to account correctly for --num <pkts>. Also, move socket stats printing
into rx ring, since it belongs there.
Todo: the kernel socket seems to have a different count that what we
see. This needs to be fixed one way or the other. Not yet sure what's
causing this.
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
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Prepare TPACKET_V3 for allowing to transparently setting up the
frame structure such that we do not need to change much in the
netsniff-ng/trafgen code.
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
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Implement ring setup routines and structures for TPACKET_V3.
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
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There's no good reason why we currently waste an 'int' for
jumbo_support while this must better be done as 'bool'.
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
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Prepare setup_rx_ring_layout for both, v2 and v3. Also do some checks
during compile time if offsets stay the same as we operate on different
union mappings.
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
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Prepare and add some structures an helper functions for TPACKET_V3.
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
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We decided to get rid of the old Git history and start a new one for
several reasons:
*) Allow / enforce only high-quality commits (which was not the case
for many commits in the history), have a policy that is more close
to the one from the Linux kernel. With high quality commits, we
mean code that is logically split into commits and commit messages
that are signed-off and have a proper subject and message body.
We do not allow automatic Github merges anymore, since they are
total bullshit. However, we will either cherry-pick your patches
or pull them manually.
*) The old archive was about ~27MB for no particular good reason.
This basically derived from the bad decision that also some PDF
files where stored there. From this moment onwards, no binary
objects are allowed to be stored in this repository anymore.
The old archive is not wiped away from the Internet. You will still
be able to find it, e.g. on git.cryptoism.org etc.
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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