Every piece of code that may need to change whenever struct flow or struct
flow_wildcards changes, but might easily get overlooked, should have a
build assertion on the value of FLOW_WC_SEQ, but these functions did not.
Signed-off-by: Ben Pfaff <blp@nicira.com>
This priority's mean is completely different from the priority of an
OpenFlow rule, so it is confusing for it to have the same name.
We should be on the lookout for a less Linux-specific name, but this one
seems fine for now.
Signed-off-by: Ben Pfaff <blp@nicira.com>
We currently have a version of ipv6_skip_exthdr() which is
identical to the main one with the addition of fragment reporting.
We can propose our version for upstream and then use it directly
without duplication.
Signed-off-by: Jesse Gross <jesse@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
It's no longer necessary to maintain a "nw_tos_mask" wildcard member,
since we only care about completely wildcarding the DSCP and ECN
portions of the IP TOS field. This commit makes that change. It also
goes a bit further in internally using "tos" to refer to the entire TOS
field (ie, DSCP and ECN). We must still refer to the DSCP portions as
"nw_tos" externally through OpenFlow 1.0, since that's the convention it
uses.
The meta-flow code enforces IPv4/IPv6 masks, so there's no reason to do
it again in the classifier. This allows a number of functions to be
removed, since the only callers were in this classifier code.
Most of the members in structures referring to network elements indicate
the layer (e.g., "tl_", "nw_", "tp_"). The "frag" and "tos" members
didn't, so this commit add them.
Add support matching the IPv4 TTL and IPv6 hop limit fields. This
commit also adds support for modifying the IPv4 TTL. Modifying the IPv6
hop limit isn't currently supported, since we don't support modifying
IPv6 headers.
We will likely want to change the user-space interface, since basic
matching and setting the TTL are not generally useful. We will probably
want the ability to match on extraordinary events (such as TTL of 0 or 1)
and a decrement action.
Feature #8024
Signed-off-by: Justin Pettit <jpettit@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
This will be useful later when we add support for matching the ECN bits
within the TOS field.
Signed-off-by: Justin Pettit <jpettit@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
Following patch adds skb-priority to flow key. So userspace will know
what was priority when packet arrived and we can remove the pop/reset
priority action. It's no longer necessary to have a special action for
pop that is based on the kernel remembering original skb->priority.
Userspace can just emit a set priority action with the original value.
Since the priority field is a match field with just a normal set action,
we can convert it into the new model for actions that are based on
matches.
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
Bug #7715
Until now, OVS has handled IP fragments more awkwardly than necessary. It
has not been possible to match on L4 headers, even in fragments with offset
0 where they are actually present. This means that there was no way to
implement ACLs that treat, say, different TCP ports differently, on
fragmented traffic; instead, all decisions for fragment forwarding had to
be made on the basis of L2 and L3 headers alone.
This commit improves the situation significantly. It is still not possible
to match on L4 headers in fragments with nonzero offset, because that
information is simply not present in such fragments, but this commit adds
the ability to match on L4 headers for fragments with zero offset. This
means that it becomes possible to implement ACLs that drop such "first
fragments" on the basis of L4 headers. In practice, that effectively
blocks even fragmented traffic on an L4 basis, because the receiving IP
stack cannot reassemble a full packet when the first fragment is missing.
This commit works by adding a new "fragment type" to the kernel flow match
and making it available through OpenFlow as a new NXM field named
NXM_NX_IP_FRAG. Because OpenFlow 1.0 explicitly says that the L4 fields
are always 0 for IP fragments, it adds a new OpenFlow fragment handling
mode that fills in the L4 fields for "first fragments". It also enhances
ovs-ofctl to allow users to configure this new fragment handling mode and
to parse the new field.
Signed-off-by: Ben Pfaff <blp@nicira.com>
Bug #7557.
These macros caused trouble if datapath-protocol.h was included before
openflow.h. Later references to the icmp_type and icmp_code members of
struct ovs_key_icmp caused compiler errors, because the macros caused them
to try to refer to nonexistent tp_src and tp_dst members in those
structures.
Commit d2c0fe (nicira-ext: Bump number of registers to five from four.)
broke the build on 64-bit systems. This commit fixes the problems it
introduced.
The "flow" module is concerned only with OpenFlow flows these days. It
shouldn't have anything to do with ODP or dpifs. However, it included
dpif.h just to implement flow_extract_stats(). This function is a better
fit for dpif.c, so this commit moves it there and removes the dpif.h
#include from flow.h and flow.c
This commit also removes a few more dpif.h #includes that weren't needed.
datapath-protocol.h is increasingly a Linux-specific header so its
usage should be restricted from generic code. Nothing in flow.c
uses it, so drop it to avoid layer violations.
Future patches will use nx_hash_fields for non-multipath related
actions. This patch renames nx_mp_fields and creates a new
flow_hash_fields() function.
There is no reason to believe that the source and destination ports
will be symmetric in a bidirectional UDP stream. This patch no
longer uses them for symmetric hashing.
I know already that this breaks the statsfixes that were implemented by the
following commits:
827ab71c97f "ofproto: Datapath statistics accounted twice."
6f1435fc8f7 "ofproto: Resubmit statistics improperly account during..."
These were already broken in a previous merge. I will work on a fix.
In addition to the changes to ofproto, this commit changes all of the
instances of "struct flow" in the tree so that the "in_port" member is an
OpenFlow port number. Previously, this member was an OpenFlow port number
in some cases and an ODP port number in other cases.
The flow extraction code for IPv6 has some deviations from both the
kernel version and other protocols in userspace. These differences
make it difficult to compare the two for correctness. This updates
the code to be more similar to the others in design and style. There
is no functional change.
Currently we stop parsing packets that are IPv6 jumbograms. While
it isn't possible to send such large packets to userspace, it's better
to drop them at that point rather than prematurely in the IPv6 code.
IPv6 does make some use of the payload length field but we can just as
easily use skb->len, which is what all other parsing uses.
Signed-off-by: Jesse Gross <jesse@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
We compute the length of the IPv6 header by parsing all of the
extension headers that we know about. However, the final result
is checked using ofpbuf_pull(), which checks the size with an
assertion. Since the length of the final header is not checked
in any other way an invalid packet can trigger this assertion.
IPv6 uses Neighbor Discovery messages in a similar manner to how IPv4
uses ARP. This commit adds support for matching deeper into the
payloads of Neighbor Solicitation (NS) and Neighbor Advertisement (NA)
messages. Currently, the matching fields include:
- NS and NA Target (nd_target)
- NS Source Link Layer Address (nd_sll)
- NA Target Link Layer Address (nd_tll)
When defining IPv6 Neighbor Discovery rules, the Nicira Extensible Match
(NXM) extension to OVS must be used.
Signed-off-by: Justin Pettit <jpettit@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
Provides ability to match over IPv6 traffic in the same manner as IPv4.
Currently, the matching fields include:
- IPv6 source and destination addresses (ipv6_src and ipv6_dst)
- Traffic Class (nw_tos)
- Next Header (nw_proto)
- ICMPv6 Type and Code (icmp_type and icmp_code)
- TCP and UDP Ports over IPv6 (tp_src and tp_dst)
When defining IPv6 rules, the Nicira Extensible Match (NXM) extension to
OVS must be used.
Signed-off-by: Justin Pettit <jpettit@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
OpenFlow 1.0 doesn't allow matching on the ARP source and target
hardware address. This has caused us to introduce hacks such as the
Drop Spoofed ARP action. Now that we have extensible match, we can
match on more fields within ARP:
- Source Hardware Address (arp_sha)
- Target Hardware Address (arp_tha)
Signed-off-by: Justin Pettit <jpettit@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
A few common IP protocol types were defined in "lib/packets.h". However,
we already assume the existence of <netinet/in.h> which contains a more
exhaustive list and should be available on POSIX systems.
Following this commit, "struct odp_flow_stats" is only used in
Linux-specific parts of OVS userspace code. This allows the actual Linux
datapath interface to evolve more freely.
Reviewed by Justin Pettit.
One of the goals for Open vSwitch is to decouple kernel and userspace
software, so that either one can be upgraded or rolled back independent of
the other. To do this in full generality, it must be possible to change
the kernel's idea of the flow key separately from the userspace version.
In turn, that means that flow keys must become variable-length. This
commit makes that change using Netlink attribute sequences.
This commit does not actually make userspace flexible enough to handle
changes in the kernel flow key structure, because userspace doesn't yet
have enough information to do that intelligently. Upcoming commits will
fix that.
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
We have a need to identify tunnels with keys longer than 32 bits. This
commit adds basic datapath and OpenFlow support for such keys. It doesn't
actually add any tunnel protocols that support 64-bit keys, so this is not
very useful yet.
The 'arg' member of struct odp_msg had to be expanded to 64-bits also,
because it sometimes contains a tunnel ID. This member also contains the
argument passed to ODPAT_CONTROLLER, so I expanded that action's argument
to 64 bits also so that it can use the full width of the expanded 'arg'.
Userspace doesn't take advantage of the new space though (it was only
using 16 bits anyhow).
This commit has been tested only to the extent that it doesn't disrupt
basic Open vSwitch operation. I have not tested it with tunnel traffic.
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
Feature #3976.
Before this commit, the compiler would add two bytes of padding to
the 'flow_wildcards' structure to achieve 32bit alignment. These
two bytes had inconsistent values which caused 'flow_wildcards_hash'
to behave inconsistently. This commit explicitly 32bit aligns
'flow_wildcards' with zero padding.
This commit also fixes an issue where in-band rules were not
getting deleted when in-band control was disabled.
Some code failed to convert tunnel IDs to host byte order for printing,
so this fixes that. Some code printed tunnel IDs with a 0x prefix and
other code didn't, so this code uses the '#' flag consistently (which
prints 0x for nonzero values and omits it for zero).
This commit also stops always printing all 8 digits. When tunnel IDs
are expanded to 64 bits, as they will be soon, printing 16 digits all the
time wastes too much space.
Acked-by: Jesse Gross <jesse@nicira.com>
