Hi,
I am trying to implement a new openflow action on an openvswitch, that upon
request by the controller buffers a given packet.
So assume a topology like H1—s1--s2—H2 where h1 sends packets to h2, the
controller would specify a BUFFER action to all packets going from h1 to h2
Making the s1 sw
erstand the ovs codebase and learn how
to implement a new action such as this one? Thanks again!
L
From: Ben Pfaff<mailto:b...@ovn.org>
Sent: Friday, April 24, 2020 18:50
To: Luca Mancini<mailto:luca.manc...@outlook.com>
Cc: ovs-discuss@openvswitch.org<mailto:ovs-discuss@open
, so something like
(action=BUFFER:Packet) or can I access it from somewhere else in the code? The
latter seams more feasible, but I don’t quite understand how I can make the
action send the packets to the userspace for processing.
Thanks,
L
From: Luca Mancini<mailto:luca.manc...@outlook.
: Ben Pfaff<mailto:b...@ovn.org>
Sent: Tuesday, April 28, 2020 20:59
To: Luca Mancini<mailto:luca.manc...@outlook.com>
Cc: ovs-discuss@openvswitch.org<mailto:ovs-discuss@openvswitch.org>
Subject: Re: [ovs-discuss] OVS custom action
On Sat, Apr 25, 2020 at 08:29:24AM +, Luca M
ns the string:
"go through this 10 times...” twice.
I don’t understand where the other packets go, are they sent to kernel space?
I’m trying to only work on userspace as I was suggested to do but I can’t seem
to get around this issue.
From: Luca Mancini<mailto:luca.manc...@outloo
send packets to
switches in a slower manner. Is there any way to avoid the packets from
overlapping, some sort of lock thing I can use? I’m working in the
ofproto-dpif-xlate.c file.
Thanks
Luca Mancini
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Hello,
Does anyone know how to set the flow flag to slow so that my action can only be
implemented in userspace?
I’ve seen a couple of actions use “ctx.xout->slow |= SLOW_ACTION;” however if
I add this line to my compose_foo() function in ofproto-dpif-xlate.c I get a
SIGABRT call which stops mi
Hi,
In userspace I’m storing the packets received in an array of struct dp_packets,
however if I try to print these packets I notice that as packets come in, they
overlap as if for every packet received the previous ctx->xin->packet is
overwritten.
My code looks something like:
Dp_packet_buff
Never mind found the change flag code
ctx->xout->slow |= SLOW_ACTION
L
From: Luca Mancini<mailto:luca.manc...@outlook.com>
Sent: Saturday, May 16, 2020 18:59
To: ovs-discuss@openvswitch.org<mailto:ovs-discuss@openvswitch.org>
Subject: [ovs-discuss] setting a flow to slow
nday, May 18, 2020 15:22
To: Luca Mancini<mailto:luca.manc...@outlook.com>
Cc: ovs-discuss@openvswitch.org<mailto:ovs-discuss@openvswitch.org>
Subject: Re: [ovs-discuss] ctx->xin-packet overlap
On Mon, May 18, 2020 at 6:10 AM Luca Mancini wrote:
>
> Hi,
>
> In user
<mailto:u9012...@gmail.com>
Sent: Tuesday, May 19, 2020 17:41
To: Luca Mancini<mailto:luca.manc...@outlook.com>
Cc: ovs-discuss@openvswitch.org<mailto:ovs-discuss@openvswitch.org>
Subject: Re: [ovs-discuss] ctx->xin-packet overlap
On Mon, May 18, 2020 at 7:10 AM Luca Mancini wrot
idea how to do this?
L
From: Luca Mancini<mailto:luca.manc...@outlook.com>
Sent: Wednesday, May 20, 2020 17:15
To: William Tu<mailto:u9012...@gmail.com>
Cc: ovs-discuss@openvswitch.org<mailto:ovs-discuss@openvswitch.org>
Subject: Re: [ovs-discuss] ctx->xin-packet overlap
Hi,
I found out while debugging my new action that ovs overlaps incoming packet
payloads and I haven’t found a fix for this. I can’t tell if it’s an OVS bug or
if I’m doing something wrong.
Basically once do_xlate_actions is called and my action is “hit” I attempt to
print the packet to gdb usi
. To continue
developing my buffering action I need the full correct packet, do you see any
other solution?
Best,
L
From: Ben Pfaff<mailto:b...@ovn.org>
Sent: Thursday, May 21, 2020 21:14
To: Luca Mancini<mailto:luca.manc...@outlook.com>
Cc: ovs-discuss@openvswitch.org<mai
("%.*s", sizeofpayload, (char *)
dp_packet_get_udp_payload(ctx->xin->packet) );
L
From: Ben Pfaff<mailto:b...@ovn.org>
Sent: Thursday, May 21, 2020 22:24
To: Luca Mancini<mailto:luca.manc...@outlook.com>
Cc: ovs-discuss@openvswitch.org<mailto:ovs-discu
Hello,
Does anyone know the way to properly create a UDP dp_packet so that I can
“manually” place a payload to it? Haven’t found anything in the code base nor
in the mailing list.
Thanks!
L
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do something along the lines of dp_packet_clone(),
dp_packet_l4() to get the pointer to the UDP header and then overwrite it with
memcpy?
Any help is really appreciated, Thanks!
Luca Mancini
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https
e new packet.
Any help is very appreciated!
Cheers,
L
From: Gregory Rose<mailto:gvrose8...@gmail.com>
Sent: Friday, June 5, 2020 18:58
To: Luca Mancini<mailto:luca.manc...@outlook.com>;
ovs-discuss@openvswitch.org<mailto:ovs-discuss@openvswitch.org>
Subject: Re: [ovs-discuss]
e new packet.
Any help is very appreciated!
Cheers,
L
From: Gregory Rose<mailto:gvrose8...@gmail.com>
Sent: Friday, June 5, 2020 18:58
To: Luca Mancini<mailto:luca.manc...@outlook.com>;
ovs-discuss@openvswitch.org<mailto:ovs-discuss@openvswitch.org>
Subject: Re: [ovs-discuss]
OVS?
Cheers,
Luca
From: Ben Pfaff<mailto:b...@ovn.org>
Sent: Friday, June 5, 2020 21:32
To: Luca Mancini<mailto:luca.manc...@outlook.com>
Cc: Gregory Rose<mailto:gvrose8...@gmail.com>;
ovs-discuss@openvswitch.org<mailto:ovs-discuss@openvswitch.org>
Subject: Re: [ovs-di
ts. The number of
bytes to send is an operand of the action that sends a packet to the
controller.
Of course it's doable in OVS--but it's going to be more work and you'll
have to understand OVS internals instead of OpenFlow.
On Fri, Jun 05, 2020 at 07:47:56PM +, Luc
for(int j=0; jmailto:gvrose8...@gmail.com>
Sent: Friday, June 5, 2020 23:05
To: Luca Mancini<mailto:luca.manc...@outlook.com>;
ovs-discuss@openvswitch.org<mailto:ovs-discuss@openvswitch.org>
Subject: Re: [ovs-discuss] DP_Packet Payload Modification
On 6/5/2020 11:00 AM, Luca
from nw_src everything is zeroed out, so it makes me think it’s
getting overwritten, but the payload is extracted correctly with
dp_packet_get_udp_paylaod meaning the payload is most likely aligned correctly.
Any thoughts of what is happening?
Luca
From: Luca Mancini<mailto:luca.m
) + UDP_HEADER_LEN, dp_packet_buff1,
sizeof(dp_packet_buff1));
packet is now complete and extraction of payload works, now I’ll start working
on the sending part which is probably not as easy as I think.
Thanks for the help!
Luca
From: Luca Mancini<mailto:luca.manc...@outlook.com>
Sent: Sa
Hello,
I’m having problems with sending custom packets using the
ofproto_dpif_send_packet().
As said in the previoius thread
https://mail.openvswitch.org/pipermail/ovs-discuss/2020-June/050204.html I
thought to have correctly created a custom udp packet that contains as a
payload a buffer of d
I believe it might be fixed by adding payload parameters to flow_compose()
instead of setting it to null like I did
From: Luca Mancini<mailto:luca.manc...@outlook.com>
Sent: Tuesday, June 9, 2020 11:39
To: ovs-discuss@openvswitch.org<mailto:ovs-discuss@openvswitch.org>
Subj
I’m trying to send a dp_packet from userspace to OFPP_NORMAL, however the
ofproto_dpif_send_packet() function won’t do it.
For now I’m using this approach:
const struct ofproto_dpif *ofproto = ctx->xin->ofproto;
const struct ofport_dpif *portExit;
ofp_port_t out_port = 2;
portExit = ofp_port_to_
Does anyone know of a way to send dp_packets throught the OFPP_NORMAL port?
I do not have the corresponding struct xlate_ctx pointer because to my
knowledge there is no way of storing it for use later on, so I can’t use the
compose_output_action() function.
I tried using ofproto_dpif_send_packet
Hello,
Are there ways in OVS store a struct xlate_ctx *ctx so that I can use it even
after another packet is received by the switch?
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tions that do these
things necess struct xlate_ctx.
Thanks!
From: Ben Pfaff<mailto:b...@ovn.org>
Sent: Wednesday, June 17, 2020 21:50
To: Luca Mancini<mailto:luca.manc...@outlook.com>
Cc: ovs-discuss@openvswitch.org<mailto:ovs-discuss@openvswitch.org>
Subject: Re: [ovs-discuss] St
ctx pointer.
The only temporary solution I have in place is iterating through the switch’s
available ports and flooding the single packets, but this is very ugly let
alone inefficient in bigger topologies.
From: Ben Pfaff<mailto:b...@ovn.org>
Sent: Wednesday, June 17, 2020 22:45
To: Luca M
Sorry, what do you mean exactly by “translate the packets using the xlate_ctx
struct”? Do you mean passing "normal” to the set of actions before buffering
the packet?
From: Ben Pfaff<mailto:b...@ovn.org>
Sent: Wednesday, June 17, 2020 23:17
To: Luca Mancini<mailto:luca.manc...@o
Pfaff<mailto:b...@ovn.org>
Sent: Wednesday, June 17, 2020 23:54
To: Luca Mancini<mailto:luca.manc...@outlook.com>
Cc: ovs-discuss@openvswitch.org<mailto:ovs-discuss@openvswitch.org>
Subject: Re: [ovs-discuss] Storing xlate_ctx CTX
When you need to send the buffered packet,
Me too haha, I won’t lose hope though and I can’t really.
Thanks for the suggestions, I’ll keep working on it and update if I manage to
come up with something
From: Ben Pfaff<mailto:b...@ovn.org>
Sent: Thursday, June 18, 2020 00:29
To: Luca Mancini<mailto:luca.manc...@outlook.com
this makes a little sense, but when I’ll be done with this whole
project I’ll make a blog and explain it all more thoroughly.
Thanks for the help!
Luca
From: Luca Mancini<mailto:luca.manc...@outlook.com>
Sent: Thursday, June 18, 2020 00:39
To: ovs-discuss@openvswitch.org<mailto:ov
Hello,
I was wondering if there is a way to have multiple instances of the same
action. For example I implemented a Buffering action as detailed previously in
https://mail.openvswitch.org/pipermail/ovs-discuss/2020-June/050197.html
so my question is, is there a way to install two different flows
Hello,
I have two different flows on the same switch:
ovs-ofctl add-flow s1
in_port=1,dl_type=2048,nw_proto=17,nw_dst=10.0.0.4,action=buffer:3
ovs-ofctl add-flow s1
in_port=1,dl_type=2048,nw_proto=17,nw_dst=10.0.0.2,action=buffer:2
these flows are supposed to buffer packets meant for the desti
ering action (in two separate flows)
add the packets to the same buffer.
From: Ben Pfaff<mailto:b...@ovn.org>
Sent: Monday, July 6, 2020 18:33
To: Luca Mancini<mailto:luca.manc...@outlook.com>
Cc: ovs-discuss@openvswitch.org<mailto:ovs-discuss@openvswitch.org>
Subject: Re: [ovs-d
this behavior to be honest. Is
having multiple ovs-vswitchd processes a valid solution instead of hard coding
my way though this?
From: Ben Pfaff<mailto:b...@ovn.org>
Sent: Monday, July 6, 2020 20:44
To: Luca Mancini<mailto:luca.manc...@outlook.com>
Cc: ovs-discuss@openvswitch.org&l
;
Sent: Monday, July 6, 2020 21:37
To: Luca Mancini<mailto:luca.manc...@outlook.com>
Cc: ovs-discuss@openvswitch.org<mailto:ovs-discuss@openvswitch.org>
Subject: Re: [ovs-discuss] different flow actions overlap
I don't recommend multiple ovs-vswitchd processes.
It sounds lik
Hello,
I’m adding a second parameter to an action I implemented, I had it working with
one parameter but if I decide to add a second one I can’t seem to modify the
parsing and formatting functions in ofp-actions.c correctly. Is there any
documentation that explains how encoding, decoding and par
Hello,
I’m trying to add support for new actions I implemented in OVS, on the RYU
controller. Does anyone have any experience in this with RYU or any other
controller? I know this question isn’t very
OVS-specific but since this might be useful information for ovs developers and
rookies, and sinc
Hi,
I implemented an action to buffer TCP packets, similarly to what I had done
with UDP packets. For udp packets everything works perfectly, however for tcp
it keeps buffering the first packet I send multiple times instead of all the
packets I try to send using netcat. Is this related to how
Can some please tell me how to print the value, ovs_16aligned_be32 tcp_seq
These types confuse me
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and then set tcpheader->tcp_seq = tcp_seq_to_print //obviously a type error here
Thanks!
From: Luca Mancini<mailto:luca.manc...@outlook.com>
Sent: Friday, July 24, 2020 10:32
To: discuss<mailto:ovs-discuss-boun...@openvswitch.org>; Numan
Siddique<mailto:num...@ovn
Hello,
I’m trying to connect a mininet topology to the internet so that I can test out
some actions I created.
I created a simple topology:
H1,h2,h3,h4 ---s1s2---Internet
I did this by adding a bridge with the ovs-vsctl add-port command to s2 (eth1
which is what the VM uses to
I’m having a weird issue with this code:
static char *
reassemble_tcp_message(struct my_tcp_split_packet *msp1)
{
VLOG_ERR("tot splits: %d, sizepayload %u", msp1[0].tot_splits,
msp1[0].sizeofpayload);
char *temp_payload_reass = malloc((char *) * msp1[0].sizeofpayload + 1);
temp_payloa
So a while back I started a project that required the implementation of new
actions in ovs. Since there is no clear guide on how to do this I leave to all
future developers a link to the project.
There’s a guide and commented code just to serve as a way for new developers to
create cool new thin
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