We have a special flow_metadata structure to represent the parts
of a packet that aren't carried in the payload itself. This is
used in the case where we need to send the packet as a Packet In
to an OpenFlow controller. This is a subset of the more general
struct flow.
In practice, almost all operations we do on this structure involve
converting it to or from a match or have code that is the same as
a match. Serialization to NXM and back is done as a match. There
is special flow_metadata formatting code that is almost identical
to match formatting.
The uses for struct flow_metadata aren't performance critical
when it comes to memory, so we can save quite a bit of code by
just using a match structure directly instead. In addition, as
metadata increases and becomes more complex (Geneve options require
some special handling beyond just additional fields), using the
match structure means we only have to do this work in one place.
Signed-off-by: Jesse Gross <jesse@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
ofpbuf was complicated due to its wide usage across all
layers of OVS, Now we have introduced independent dp_packet
which can be used for datapath packet, we can simplify ofpbuf.
Following patch removes DPDK mbuf and access API of ofpbuf
members.
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Jarno Rajahalme <jrajahalme@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
Currently dp-packet make use of ofpbuf for managing packet
buffers. That complicates ofpbuf, by making dp-packet
independent of ofpbuf both libraries can be optimized for
their own use case.
This avoids mapping operation between ofpbuf and dp_packet
in datapath upcalls.
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Jarno Rajahalme <jrajahalme@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
In "MAC flooding", an attacker transmits an overwhelming number of frames
with unique Ethernet source address on a switch port. The goal is to
force the switch to evict all useful MAC learning table entries, so that
its behavior degenerates to that of a hub, flooding all traffic. In turn,
that allows an attacker to eavesdrop on the traffic of other hosts attached
to the switch, with all the risks that that entails.
Before this commit, the Open vSwitch "normal" action that implements its
standalone switch behavior (and that can be used by OpenFlow controllers
as well) was vulnerable to MAC flooding attacks. This commit fixes the
problem by implementing per-port fairness for MAC table entries: when
the MAC table is at its maximum size, MAC table eviction always deletes an
entry from the port with the most entries. Thus, MAC entries will never
be evicted from ports with only a few entries if a port with a huge number
of entries exists.
Controllers could introduce their own MAC flooding vulnerabilities into
OVS. For a controller that adds destination MAC based flows to an OpenFlow
flow table as a reaction to "packet-in" events, such a bug, if it exists,
would be in the controller code itself and would need to be fixed in the
controller. For a controller that relies on the Open vSwitch "learn"
action to add destination MAC based flows, Open vSwitch has existing
support for eviction policy similar to that implemented in this commit
through the "groups" column in the Flow_Table table documented in
ovs-vswitchd.conf.db(5); we recommend that users of "learn" not already
familiar with eviction groups to read that documentation.
In addition to implementation of per-port MAC learning fairness,
this commit includes some closely related changes:
- Access to client-provided "port" data in struct mac_entry
is now abstracted through helper functions, which makes it
easier to ensure that the per-port data structures are maintained
consistently.
- The mac_learning_changed() function, which had become trivial,
vestigial, and confusing, was removed. Its functionality was folded
into the new function mac_entry_set_port().
- Many comments were added and improved; there had been a lot of
comment rot in previous versions.
CERT: VU#784996
Reported-by: "Ronny L. Bull - bullrl" <bullrl@clarkson.edu>
Reported-at: http://www.irongeek.com/i.php?page=videos/derbycon4/t314-exploring-layer-2-network-security-in-virtualized-environments-ronny-l-bull-dr-jeanna-n-matthews
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Ethan Jackson <ethan@nicira.com>
Also moves definitions for struct vconn and pvconn to the public
header. The provider interface is kept private.
Signed-off-by: Thomas Graf <tgraf@noironetworks.com>
Acked-by: Ben Pfaff <blp@nicira.com>
A new function vlog_insert_module() is introduced to avoid using
list_insert() from the vlog.h header.
Signed-off-by: Thomas Graf <tgraf@noironetworks.com>
Acked-by: Ben Pfaff <blp@nicira.com>
This patch enables a user to set importance for a new rule via add-flow
OF1.4+ in the OVS and display the same via dump-flows command OF1.4+.
The changes are made in accordance with OpenFlow 1.4 specs to implement
eviction on the basis of "importance". This patch also enhances the
diff-flows & replace-flows CLI for addition of importance parameter in
a rule.
This doesn't actually implement eviction on the basis of importance, which
will happen in a later patch.
Signed-off-by: Rishi Bamba <rishi.bamba@tcs.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
The controller setup in my personal test environment has been broken for a
while. I figured that it wasn't anything important, though, because no one
else had reported similar problems. Anyway, it turns out that enabling
OpenFlow 1.3 by default broke test-controller because OpenFlow 1.3 doesn't
send table misses to the controller by default. This commit fixes the
problem.
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Alex Wang <alexw@nicira.com>
This is only the communication part of the bundles functionality.
The actual message pre-validation and commits are not implemented.
We also enable OF1.4 for all the tests.
Signed-off-by: Alexandru Copot <alex.mihai.c@gmail.com>
Cc: Daniel Baluta <dbaluta@ixiacom.com>
[blp@nicira.com made ofputil_decode_bundle_add() more obviously correct]
Signed-off-by: Ben Pfaff <blp@nicira.com>
Change the flow_extract() API to accept struct pkt_metadata,
instead of individual metadata fields. It will make the API more
logical and easier to maintain when we need to expand metadata
down the road.
Signed-off-by: Andy Zhou <azhou@nicira.com>
Acked-by: Jarno Rajahalme <jrajahalme@nicira.com>¬
It contains only Set-Async-Config and Role status message definitions.
Signed-off-by: Alexandru Copot <alex.mihai.c@gmail.com>
Cc: Daniel Baluta <dbaluta@ixiacom.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
Starting ovs-controller with '-H' option will lead to a segment fault problem.
Add a check, and adjust the indentation of the following code.
Signed-off-by: ZhengLingyun <konghuarukhr@163.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
Added infrastructure to support Openflow OFPT_TABLE_MOD message. This patch
does not include the flexible table miss handling code that is necessary to
support the semantics specified in OFPT_TABLE_MOD messages.
Current flow miss behavior continues to conform to Openflow 1.0. Future
commits to add more flexible table miss support are needed to fully support
OPFT_TABLE_MOD for Openflow-1.1+.
Signed-off-by: Andy Zhou <azhou@nicira.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
This doesn't include a dpif implementation of groups functionality. In its
current form, it is untested.
Signed-off-by: Neil Zhu <zhuj@centecnetworks.com>
Co-authored-by: Ben Pfaff <blp@nicira.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
Co-authored-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Simon Horman <horms@verge.net.au>
Co-authored-by: Jarno Rajahalme <jrajahalme@nicira.com>
Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com>
Keep track of usable protocols while parsing actions and matches,
rather than checking for them afterwards. This fixes silently discarded
meter and goto table instructions when not explicitly specifying the
protocol to use.
Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
This patch transitions mac learning away from using tags as required
by future patches.
Signed-off-by: Ethan Jackson <ethan@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
These functions are used so often, that having an easy to read
helper is worth it.
Signed-off-by: Ethan Jackson <ethan@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
Until now, datapath ports and openflow ports were both represented by
unsigned integers of various sizes. With implicit conversions, etc., it is
easy to mix them up and use one where the other is expected. This commit
creates two typedefs, ofp_port_t and odp_port_t. Both of these two types
are marked by "__attribute__((bitwise))" so that sparse can be used to
detect any misuse.
Signed-off-by: Alex Wang <alexw@nicira.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
This commit changes variable "int i" of "union port" of "struct mac_entry"
to "uint16_t ofp_port", since it is used to store the OpenFlow port number.
Signed-off-by: Alex Wang <alexw@nicira.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
This is a straight search-and-replace, except that I also removed #include
<assert.h> from each file where there were no assert calls left.
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Ethan Jackson <ethan@nicira.com>
Initial OpenFlow 1.3 support with new include/openflow/openflow-1.3.h.
Most of the messages that differ from 1.2 are implemented. OFPT_SET_ASYNC
is implemented via NX_SET_ASYNC_CONFIG, other new message types are yet to
be implemented. Stats replies that add duration fields are implemented at
encode/decode level only. Test cases for implemented features are included.
Remaining FIXME:s should not cause runtime aborts. Make check comes out
clean.
Signed-off-by: Jarno Rajahalme <jarno.rajahalme@nsn.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
This patch adds support for skb mark matching and set action.
Acked-by: Jesse Gross <jesse@nicira.com>
Signed-off-by: Ansis Atteka <aatteka@nicira.com>
Soon, it's not going to be possible to switch between every possible
protocol on an established OpenFlow connection, yet
ofputil_encode_set_protocol() didn't have a documented way to report such
a problem. This commit adds a means for reporting and makes its callers
able to handle the problem.
Also, initially make ofputil_encode_set_protocol() fail when the current
and requested protocols are for different OpenFlow versions.
Signed-off-by: Ben Pfaff <blp@nicira.com>
Reviewed-by: Simon Horman <horms@verge.net.au>
Soon the kernel will begin supplying the information about the outer
IP header for tunneled packets and userspace will need to be able to
track it as part of the flow. For the time being this is only used
internally by OVS and not exposed outwards to OpenFlow. As a result,
this threads the information throughout userspace but simply stores
the existing tun_id in it.
Signed-off-by: Jesse Gross <jesse@nicira.com>
OVS has all kinds of odd fields, e.g. registers, and it doesn't make sense
to try to match on all of them. This commit changes learning-switch to
only try to match on the fields defined by OpenFlow 1.0. That's still not
minimal, but it's more reasonable.
This commit should not have an immediately visible effect since
ovs-controller always sends OF1.0 format flows to the switch, and OF1.0
format flows don't have these extra fields. But in the future when we
add support for new protocols and flow formats to ovs-controller, it
will make a difference.
Signed-off-by: Ben Pfaff <blp@nicira.com>
The learning-switch implementation needs to know the OpenFlow version in
use to send the initial handshake messages (e.g. the feature request), but
the version is not always available at the time that the code currently
sends the handshake. This can cause an assertion failure later when
ofputil_encode_flow_mod() checks the protocol, which will be 0 if the
version wasn't known.
This commit fixes the problem by introducing a state machine that sends the
handshake messages only after version negotiation has finished.
Reported-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Ben Pfaff <blp@nicira.com>
Until now, ovs-controller and the learning-switch code split responsibility
for the OpenFlow connection. This commit moves all the responsibility into
the learning-switch code.
The rationale here is twofold. First, the split itself seems odd; I think
there must have been a reason for it at one time, but I don't remember it
and don't see one anymore. Second, I intend to make the lswitch code more
stateful in upcoming commits, and it seems odd to have the lswitch manage
quite a bit of state but not the entity that that state applies to.
Signed-off-by: Ben Pfaff <blp@nicira.com>
OpenFlow headers are not as uniform as they could be, with size, alignment,
and numbering changes from one version to another and across varieties
(e.g. ordinary messages vs. "stats" messages). Until now the Open vSwitch
internal APIs haven't done a good job of abstracting those differences in
header formats. This commit changes that; from this commit forward very
little code actually needs to understand the header format or numbering.
Instead, it can just encode or decode, or pull or put, the header using
a more abstract API using the ofpraw_, ofptype_, and other APIs in the
new ofp-msgs module.
Signed-off-by: Ben Pfaff <blp@nicira.com>
Tested-by: Simon Horman <horms@verge.net.au>
Reviewed-by: Simon Horman <horms@verge.net.au>
OpenFlow switching monitoring and controller coordination can be made more
efficient if the switch can notify a controller of flow table changes as
they occur, rather than periodically polling for changes. This commit
implements such a feature.
Feature #6633.
CC: Natasha Gude <natasha@nicira.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
OpenFlow actions have always been somewhat awkward to handle.
Moreover, over time we've started creating actions that require more
complicated parsing. When we maintain those actions internally in
their wire format, we end up parsing them multiple times, whenever
we have to look at the set of actions.
When we add support for OpenFlow 1.1 or later protocols, the situation
will get worse, because these newer protocols support many of the same
actions but with different representations. It becomes unrealistic to
handle each protocol in its wire format.
This commit adopts a new strategy, by converting OpenFlow actions into
an internal form from the wire format when they are read, and converting
them back to the wire format when flows are dumped. I believe that this
will be more maintainable over time.
Thanks to Simon Horman and Pravin Shelar for reviews.
Signed-off-by: Ben Pfaff <blp@nicira.com>
This better fits our general policy of adding a version number suffix
to structures and constants whose values differ from one OpenFlow
version to the next.
Reviewed-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Ben Pfaff <blp@nicira.com>
This commit adapts a couple of existing pieces of code to use the
new data structure. The following commit will add another user
(which is also the first use of the simap_increas() function).
Signed-off-by: Ben Pfaff <blp@nicira.com>
OpenFlow 1.0 is limited to displaying 1364 ports in the Features Reply
message, and there is no other way to get consolidated port information.
OpenFlow 1.3 adds a new port description multipart message
(OFPMP_PORT_DESC) that is not limited by size. This commit adds support
through the OpenFlow 1.0 stats mechanism, since they have complimentary
enum values.
Bug #11040
Signed-off-by: Justin Pettit <jpettit@nicira.com>
Replaced all instances of Nicira Networks(, Inc) to Nicira, Inc.
Feature #10593
Signed-off-by: Raju Subramanian <rsubramanian@nicira.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
Before this patch, rconn_send() would delete 'b' on success, and
not on error. This is confusing and error-prone. This patch
causes rconn_send() to always delete 'b'.
Signed-off-by: Ethan Jackson <ethan@nicira.com>
An upcoming commit will start referring to OpenFlow 1.1 actions, which are
renumbered relative to OpenFlow 1.0 actions, so this commit prepares by
changing all the existing uses of OFPAT_* to instead use OFPAT10_*.
This commit also introduces the OFPAT11_* constants.
Reviewed-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Ben Pfaff <blp@nicira.com>
Open vSwitch already handles a few different protocol variations, but it
does so in a nonuniform manner:
- OpenFlow 1.0 and NXM flow formats are distinguished using the NXFF_*
constant values from nicira-ext.h.
- The "flow_mod_table_id" feature setting is maintained in ofproto as
part of an OpenFlow connection's (ofconn's) state.
There's no way to easily communicate this state among components. It's
not much of a problem yet, but as more protocol support is added it seems
better to have an abstract, uniform way to represent protocol versions and
variants. This commit implements that by introducing a new type
"enum ofputil_protocol". Each ofputil_protocol value represents a variant
of a protocol version. Each value is a separate bit, so a single enum
can also represent a set of protocols, which is often useful as well.
Reviewed-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Ben Pfaff <blp@nicira.com>
Nicira's controllers are somewhat heterogeneous, so that particular
"packet-in" messages should be directed to particular controllers. This
new Nicira extension action allows designating a controller or controllers
to receive the "packet-in" using a 16-bit integer ID.
The new NXAST_CONTROLLER action also specifies the "reason" code to include
in the "packet-in" message. This is particularly useful for simulating a
"no-match" "packet-in" using a rule.
Feature #8946.
Signed-off-by: Ben Pfaff <blp@nicira.com>
