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tcp_l2_buf_flush() open codes the "primary" send of message to the passt
tap interface, but calls tcp_l2_buf_flush_part() to handle the case of a
short send. Combine these two passt-specific operations into
tcp_l2_buf_flush_passt() which is a little cleaner and will enable furrther
cleanups.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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pcapm() captures multiple frames from a msghdr, however the only thing it
cares about in the msghdr is the list of buffers, where it assumes there is
one frame to capture per buffer. That's what we want for its single caller
but it's not the only obvious choice here (one frame per msghdr would
arguably make more sense in isolation). In addition pcapm() has logic
that only makes sense in the context of the passt specific path its called
from: it skips the first 4 bytes of each buffer, because those have the
qemu vnet_len rather than the frame proper.
Make this clearer by replacing pcapm() with pcap_multiple() which more
explicitly takes one struct iovec per frame, and parameterizes how much of
each buffer to skip (i.e. the offset of the frame within the buffer).
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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pcap(), pcapm() and pcapmm() duplicate some code, for the actual writing
to the capture file. The purpose of pcapm() and pcapmm() not calling
pcap() seems to be to avoid repeatedly calling gettimeofday() and to avoid
printing errors for every packet in a batch if there's a problem. We can
accomplish that while still sharing code by adding a new helper which
takes the packet timestamp as a parameter.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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Currently, when ports are forwarded inbound in pasta mode, we open two
sockets for incoming traffic: one listens on the public IP address and will
forward packets to the tuntap interface. The other listens on localhost
and forwards via "splicing" (resending directly via sockets in the ns).
Now that we've improved the logic about whether we "splice" any individual
packet, we don't need this. Instead we can have a single socket bound to
0.0.0.0 or ::, marked as able to splice and udp_sock_handler() will deal
with each packet as appropriate.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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Currently we have special sockets for receiving datagrams from locahost
which can use the optimized "splice" path rather than going across the tap
interface.
We want to loosen this so that sockets can receive sockets that will be
forwarded by both the spliced and non-spliced paths. To do this, we alter
the meaning of the @splice bit in the reference to mean that packets
receieved on this socket *can* be spliced, not that they *will* be spliced.
They'll only actually be spliced if they come from 127.0.0.1 or ::1.
We can't (for now) remove the splice bit entirely, unlike with TCP. Our
gateway mapping means that if the ns initiates communication to the gw
address, we'll translate that to target 127.0.0.1 on the host side. Reply
packets will therefore have source address 127.0.0.1 when received on the
host, but these need to go via the tap path where that will be translated
back to the gateway address. We need the @splice bit to distinguish that
case from packets going from localhost to a port mapped explicitly with
-u which should be spliced.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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These two functions now have a very similar structure, and their first
part (calling recvmmsg()) is functionally identical. So, merge the two
functions into one.
This does have the side effect of meaning we no longer receive multiple
packets at once for splice (we already didn't for tap). This does hurt
throughput for small spliced packets, but improves it for large spliced
packets and tap packets.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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udp_splice_namebuf is now used only for spliced sending, and so it is
only ever populated with the localhost address, either IPv4 or IPv6.
So, replace the awkward initialization in udp_sock_handler_splice()
with statically initialized versions for IPv4 and IPv6. We then just
need to update the port number in udp_sock_handler_splice().
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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UDP_MAX_FRAMES gives the maximum number of datagrams we'll ever handle as a
batch for sizing our buffers and control structures. The subtly different
UDP_TAP_FRAMES gives the maximum number of datagrams we'll actually try to
receive at once for tap packets in the current configuration.
This depends on the mode, meaning that the macro has a non-obvious
dependency on the usual 'c' context variable being available. We only use
it in one place, so it makes more sense to open code this. Add an
explanatory comment while we're there.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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The receive part of udp_sock_handler() and udp_sock_handler_splice() is now
almost identical. In preparation for merging that, split the receive part
of udp_sock_handler() from the part preparing and sending the frames for
sending on the tap interface. The latter goes into a new udp_tap_send()
function.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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The last part of udp_sock_handler() does the actual sending of frames
to the tap interface. For pasta that's just a call to
udp_tap_send_pasta() but for passt, it's moderately complex and open
coded.
For symmetry, move the passt send path into its own function,
udp_tap_send_passt(). This will make it easier to abstract the tap
interface in future (e.g. when we want to add vhost-user).
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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udp_sock_handler() has a surprising difference in flow between pasta and
passt mode: For pasta we send each frame to the tap interface as we prepare
it. For passt, though, we prepare all the frames, then send them with a
single sendmmsg().
Alter the pasta path to also prepare all the frames, then send them at the
end. We already have a suitable data structure for the passt case. This
will make it easier to abstract out the tap backend difference in future.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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Similarly to UDP cases, these were missing as it wasn't clear, when
the other tests were introduced, if using the global address of a
namespace, from the host, should have resulted in connections being
routed via the tap interface.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
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Reported by Coverity (CWE-606, Untrusted loop bound), and actually
harmless because we'll exit the option-scanning loop if the remaining
length is not enough for a new option, instead of reading past the
header.
In any case, it looks like a good idea to explicitly check for
reasonable values of option lengths.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
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These were missing as it wasn't clear, when the other tests were
introduced, if using the global address of a namespace, from the
host, should have resulted in traffic being routed via the tap
interface (as opposed to the loopback interface). We now clarified
that's actually the case.
Use same values and thresholds as the tests for loopback traffic, as
throughput figures currently indicate there isn't much difference.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
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The main purpose of udp_sock_fill_data_v[46]() is to construct the IP, UDP
and other headers we'll need to forward data onto the tap interface. In
addition they update the control structures (iovec and mmsghdr) we'll need
to send the messages, and in the case of pasta actually sends it.
This leads the control structure management and the send itself awkwardly
split between udp_sock_fill_data_v[46]() and their caller
udp_sock_handler(). In addition, this tail part of udp_sock_fill_datav[46]
is essentially common between the IPv4 and IPv6 versions, apart from which
control array we're working on.
Clean this up by reducing these functions to just construct the headers
and renaming them to udp_update_hdr[46]() accordingly. The control
structure updates are now all in the caller, and common for IPv4 and IPv6.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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Currently, we always populate udp[46]_l2_iov_tap[].iov_base with the
very start of the header buffers, including space for the qemu vnet_len
tag suitable for passt mode. That's ok because we don't actually use these
iovecs for pasta mode.
However, we do know the mode in udp_sock[46]_iov_init() so adjust these
to the beginning of the headers we'll actually need for the mode: including
the vnet_len tag for passt, but excluding it for pasta.
This allows a slightly nicer way to locate the right buffer to send in the
pasta case, and will allow some additional cleanups later.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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Apart from which mh array they're operating on the recvmmsg() calls in
udp_sock_handler() are identical between the IPv4 and IPv6 paths, as are
some of the control structure updates.
By using some local variables to refer to the IP version specific control
arrays, make some more logic common between the IPv4 and IPv6 paths. As
well as slightly reducing the code size, this makes it less likely that
we'll accidentally use the IPv4 arrays in the IPv6 path or vice versa as we
did in a recently fixed bug.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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udp_sock_handler() incorrectly uses udp6_l2_mh_tap[] on the IPv4 path. In
fact this is harmless because this assignment is redundant (the 0th entry
msg_hdr will always point to the 0th iov entry for both IPv4 and IPv6 and
won't change).
There is also an incorrect usage of udp6_l2_mh_tap[] in
udp_sock_fill_data_v4. This one can cause real problems, because we'll
use stale iov_len values if we send multiple messages to the qemu socket.
Most of the time that will be relatively harmless - we're likely to either
drop UDP packets, or send duplicates. However, if the stale iov_len we
use ends up referencing an uninitialized buffer we could desynchronize the
qemu stream socket.
Correct both these bugs. The UDP6 path appears to be correct, but it does
have some comments that incorrectly reference the IPv4 versions, so fix
those as well.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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udp_sock_handler_splice() reads a whole batch of datagrams at once with
recvmmsg(). It then forwards them all via a single socket on the other
side, based on the source port.
However, it's entirely possible that the datagrams in the set have
different source ports, and thus ought to be forwarded via different
sockets on the destination side. In fact this situation arises with the
iperf -P4 throughput tests in our own test suite. AFAICT we only get away
with this because iperf3 is strictly one way and doesn't send reply packets
which would be misdirected because of the incorrect source ports.
Alter udp_sock_handler_splice() to split the packets it receives into
batches with the same source address and send each batch with a separate
sendmmsg().
For now we only look for already contiguous batches, which means that if
there are multiple active flows interleaved this is likely to degenerate
to batches of size 1. For now this is the simplest way to correct the
behaviour and we can try to optimize later.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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Move the part of udp_sock_handler_splice() concerned with sending out the
datagrams into a new udp_splice_sendfrom() helper. This will make later
cleanups easier.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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We maintain a set of buffers for UDP packets to be forwarded via the tap
interface in udp[46]_l2_buf. We then have a separate set of buffers for
packets to be "spliced" in udp_splice_buf[]. However, we only use one of
these at a time, so we can share the buffer space.
For the receiving splice packets we can not only re-use the data buffers
but also the udp[46]_l2_iov_sock and udp[46]_l2_mh_sock control structures.
For sending the splice packets we keep the same data buffers, but we need
specific control structures. We create udp[46]_iov_splice - we can't
reuse udp_l2_iov_sock[] because we need to write iov_len as we're writing
spliced packets, but the tap path expects iov_len to remain the same (it
only uses it for receive). Likewise we create udp[46]_mh_splice with the
mmsghdr structures for sending spliced packets. As well as needing to
reference different iovs, these need to all reference udp_splice_namebuf
instead of individual msg_name fields for each slot.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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udp_sock_handler_splice() has a somewhat clunky if to extract the port from
a socket address which could be either IPv4 or IPv6. Future changes are
going to make this even more clunky, so introduce a helper function to
do this extraction.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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These two constants have the same value, and there's not a lot of reason
they'd ever need to be different. Future changes will further integrate
the spliced and "tap" paths so that these need to be the same. So, merge
them into UDP_MAX_FRAMES.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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Previous cleanups mean that we can now rework some complex ifs in
udp_sock_handler_splice() into a simpler set.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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A UDP pseudo-connection between port A in the init namespace and port B in
the pasta guest namespace involves two sockets: udp_splice_init[v6][B]
and udp_splice_ns[v6][A]. The socket which originated this "connection"
will be permanent but the other one will be closed on a timeout.
When we get a packet from the originating socket, we update the timeout on
the other socket, but we don't do the same when we get a reply packet from
the other socket. However any activity on the "connection" probably
indicates that it's still in use. Without this we could incorrectly time
out a "connection" if it's using a protocol which involves a single
initiating packet, but which then gets continuing replies from the target.
Correct this by updating the timeout on both sockets for a packet in either
direction. This also updates the timestamps for the permanent originating
sockets which is unnecessary, but harmless.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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When we look up udp_splice_to_ns[][].orig_sock in udp_sock_handler_splice()
we're finding the socket on which the originating packet for the
"connection" was received on. However, we don't specifically need this
socket to be the originating one - we just need one that's bound to the
the source port of this reply packet in the init namespace. We can look
this up in udp_splice_to_init[v6][src].target_sock, whose defining
characteristic is exactly that. The same applies with init and ns swapped.
In practice, of course, the port we locate this way will always be the
originating port, since we couldn't have started this "connection" if it
wasn't.
Change this, and we no longer need the @orig_sock field at all. That
leaves just @target_sock which we rename to simply @sock. The whole
udp_splice_flow structure now more represents a single bound port than
a "flow" per se, so rename and recomment it accordingly. Likewise the
udp_splice_to_{ns,init} names are now misleading, since the ports in
those maps are used in both directions. Rename them to
udp_splice_{ns,init} indicating the location where the described
socket is bound.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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When we look up udp_splice_to_ns[v6][src].target_sock in
udp_sock_handler_splice, all we really require of the socket is that it
be bound to port src in the pasta guest namespace. Similarly for
udp_splice_to_init but bound in the init namespace.
Usually these sockets are created temporarily by udp_splice_connect() and
cleaned up by udp_timer(). However, depending on the -u and -U options its
possible we have a permanent socket bound to the relevant port created by
udp_sock_init(). If such a socket exists, we could use it instead of
creating a temporary one. In fact we *must* use it, because we'll fail
trying to bind() a temporary one to the same port.
So allow this, store permanently bound sockets into udp_splice_to_{ns,init}
in udp_sock_init(). These won't get incorrectly removed by the timer
because we don't put a corresponding entry in the udp_act[] structure
which directs the timer what to clean up.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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For each IP version udp_socket() has 3 possible calls to sock_l4(). One
is for the "non-spliced" bound socket in the init namespace, one for the
"spliced" bound socket in the init namespace and one for the "spliced"
bound socket in the pasta namespace.
However when this is called to create a socket in the pasta namspeace there
is a logic error which causes it to take the path for the init side spliced
socket as well as the ns socket. This essentially tries to create two
identical sockets on the ns side. Unsurprisingly the second bind() call
fails according to strace.
Correct this to only attempt to open one socket within the ns.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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The @splice field in union udp_epoll_ref can have a number of values for
different types of "spliced" packet flows. Split it into several single
bit fields with more or less independent meanings. The new @splice field
is just a boolean indicating whether the socket is associated with a
spliced flow, making it identical to the @splice fiend in tcp_epoll_ref.
The new bit @orig, indicates whether this is a socket which can originate
new udp packet flows (created with -u or -U) or a socket created on the
fly to handle reply socket. @ns indicates whether the socket lives in the
init namespace or the pasta namespace.
Making these bits more orthogonal to each other will simplify some future
cleanups.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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We set this field, but nothing ever checked it.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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Currently we connect() the socket we use to forward spliced UDP flows.
However, we now only ever use sendto() rather than send() on this socket
so there's not actually any need to connect it. Don't do so.
Rename a number of things that referred to "connect" or "conn" since that
would now be misleading.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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udp_sock_handler_splice() has two different ways of sending out packets
once it has determined the correct destination socket. For the originating
sockets (which are not connected) it uses sendto() to specify a specific
address. For the forward socket (which is connected) we use send().
However we know the correct destination address even for the forward socket
we do also know the correct destination address. We can use this to use
sendto() instead of send(), removing the need for two different paths and
some staging data structures.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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Each entry udp_splice_map[v6][N] keeps information about two essentially
unrelated packet flows. @ns_conn_sock, @ns_conn_ts and @init_bound_sock
track a packet flow from port N in the host init namespace to some other
port in the pasta namespace (the one @ns_conn_sock is connected to).
@init_conn_sock, @init_conn_ts and @ns_bound_sock track packet flow from
port N in the pasta namespace to some other port in the host init namespace
(the one @init_conn_sock is connected to).
Split udp_splice_map[][] into two separate tables for the two directions.
Each entry in each table is a 'struct udp_splice_flow' with @orig_sock
(previously the bound socket), @target_sock (previously the connected
socket) and @ts (the timeout for the target socket).
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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pasta handles "spliced" port forwarding by resending datagrams received on
a bound socket in the init namespace to a connected socket in the guest
namespace. This means there are actually three ports associated with each
"connection". First there's the source and destination ports of the
originating datagram. That's also the destination port of the forwarded
datagram, but the source port of the forwarded datagram is the kernel
allocated bound address of the connected socket.
However, by bind()ing as well as connect()ing the forwarding socket we can
choose the source port of the forwarded datagrams. By choosing it to match
the original source port we remove that surprising third port number and
no longer need to store port numbers in struct udp_splice_port.
As a bonus this means that the recipient of the packets will see the
original source port if they call getpeername(). This rarely matters, but
it can't hurt.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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In the case where the client writes a packet and then closes the
socket, because we receive EPOLLIN|EPOLLRDHUP together we have a
choice of whether to close the socket immediately, or read the packet
and then close the socket. Choose the latter.
This should improve fuzzing coverage and arguably is a better choice
even for regular use since dropping packets on close is bad.
See-also: https://archives.passt.top/passt-dev/20221117171805.3746f53a@elisabeth/
Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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This passes a fully connected stream socket to passt.
Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
[sbrivio: reuse fd_tap instead of adding a new descriptor,
imply --one-off on --fd, add to optstring and usage()]
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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These files are left around by emacs amongst other editors.
Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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If you run the build several times it will fail unnecessarily with:
ln -s passt pasta
ln: failed to create symbolic link 'pasta': File exists
make: *** [Makefile:134: pasta] Error 1
Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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The pointers are actually the same, but we later pass the container
union to tcp_table_compact(), which might zero the size of the whole
union, and this confuses Coverity Scan.
Given that we have pointers to the container union to start with,
just pass those instead, all the way down to tcp_table_compact().
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
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Platforms like Linux allow IPv6 sockets to listen for IPv4 connections as
well as native IPv6 connections. By doing this we halve the number of
listening sockets we need for TCP (assuming passt/pasta is listening on the
same ports for IPv4 and IPv6). When forwarding many ports (e.g. -t all)
this can significantly reduce the amount of kernel memory that passt
consumes.
When forwarding all TCP and UDP ports for both IPv4 and IPv6 (-t all
-u all), this reduces kernel memory usage from ~677MiB to ~487MiB
(kernel version 6.0.8 on Fedora 37, x86_64).
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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According to its doc comments, sock_l4() returns -1 on error. It does,
except in one case where it returns -EIO. Fix this inconsistency to match
the docs and always return -1.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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Currently, when instructed to open an IPv6 socket, sock_l4() explicitly
sets the IPV6_V6ONLY socket option so that the socket will only respond to
IPv6 connections. Linux (and probably other platforms) allow "dual stack"
sockets: IPv6 sockets which can also accept IPv4 connections.
Extend sock_l4() to be able to make such sockets, by passing AF_UNSPEC as
the address family and no bind address (binding to a specific address would
defeat the purpose). We add a Makefile define 'DUAL_STACK_SOCKETS' to
indicate availability of this feature on the target platform.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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Previous cleanups mean that tcp_sock_init4() and tcp_sock_init6() are
almost identical, and the remaining differences can be easily
parameterized. Combine both into a single tcp_sock_init_af() function.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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For non-spliced connections we now treat IPv4-mapped IPv6 addresses the
same as the corresponding IPv4 addresses. However currently we won't
splice a connection from ::ffff:127.0.0.1 the way we would one from
127.0.0.1. Correct this so that we can splice connections from IPv4
localhost that have been received on an IPv6 dual stack socket.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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passt usually doesn't NAT, but it does do so for the remapping of the
gateway address to refer to the host. Currently we perform this NAT with
slightly different rules on both IPv4 addresses and IPv6 addresses, but not
on IPv4-mapped IPv6 addresses. This means we won't correctly handle the
case of an IPv4 connection over an IPv6 socket, which is possible on Linux
(and probably other platforms).
Refactor tcp_conn_from_sock() to perform the NAT after converting either
address family into an inany_addr, so IPv4 and and IPv4-mapped addresses
have the same representation.
With two new helpers this lets us remove the IPv4 and IPv6 specific paths
from tcp_conn_from_sock().
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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This bit in the TCP specific epoll reference indicates whether the
connection is IPv6 or IPv4. However the sites which refer to it are
already calling accept() which (optionally) returns an address for the
remote end of the connection. We can use the sa_family field in that
address to determine the connection type independent of the epoll
reference.
This does have a cost: for the spliced case, it means we now need to get
that address from accept() which introduces an extran copy_to_user().
However, in future we want to allow handling IPv4 connectons through IPv6
sockets, which means we won't be able to determine the IP version at the
time we create the listening socket and epoll reference. So, at some point
we'll have to pay this cost anyway.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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It looks like tcp_seq_init() is supposed to advance the sequence number
by one every 32ns. However we only right shift the ns part of the timespec
not the seconds part, meaning that we'll advance by an extra 32 steps on
each second.
I don't know if that's exploitable in any way, but it doesn't appear to be
the intent, nor what RFC 6528 suggests.
In addition, we convert from seconds to nanoseconds with a multiplication
by '1E9'. In C '1E9' is a floating point constant, forcing a conversion
to floating point and back for what should be an integer calculation
(confirmed with objdump and Makefile default compiler flags). Spell out
1000000000 in full to avoid that.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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tcp_seq_init() takes a number of parameters for the connection, but at
every call site, these are already populated in the tcp_conn structure.
Likewise we always store the result into the @seq_to_tap field.
Use this to simplify tcp_seq_init().
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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tcp_seq_init() has separate paths for IPv4 and IPv6 addresses, which means
we will calculate different sequence numbers for IPv4 and equivalent
IPv4-mapped IPv6 addresses.
Change it to treat these the same by always converting the input address
into an inany_addr representation and use that to calculate the sequence
number.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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tcp_hash_match() can take either an IPv4 (struct in_addr) or IPv6 (struct
in6_addr) address. It has two different paths for each of those cases.
However, its only caller has already constructed an equivalent inany
representation of the address, so we can have tcp_hash_match take that
directly and use a simpler comparison with the inany_equals() helper.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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