[ovs-dev] [PATCH ovn v2 2/3] actions: Add new OVN logical fields 'ip.src' and ip.dst'.

Numan Siddique numans at ovn.org
Wed Oct 14 11:54:50 UTC 2020


On Wed, Oct 14, 2020 at 4:40 PM Dumitru Ceara <dceara at redhat.com> wrote:
>
> On 10/14/20 12:50 PM, Numan Siddique wrote:
> > On Wed, Oct 14, 2020 at 3:50 PM Dumitru Ceara <dceara at redhat.com> wrote:
> >>
> >> On 10/14/20 11:15 AM, numans at ovn.org wrote:
> >>> From: Numan Siddique <numans at ovn.org>
> >>>
> >>> Thee new fields are version independent and these can be used in any
> >>
> >> Hi Numan,
> >>
> >> Nit: s/Thee/These
> >>
> >>> OVN action. Right now the usage of these fields are restricted to
> >>> exchanging the IP source and destination fields.
> >>>
> >>> Eg. reject {... ip.src <-> ip.dst ... };
> >>>
> >>> "ip.src <-> ip.dst" translates to controller action with "pause" flag set.
> >>> When pinctrl thread receives the packet in, it checks the IP version of the
> >>> packet and either does - "ip4.src <-> ip4.dst" or "ip6.src <-> ip6.dst" and
> >>> resumes the packet to continue with the pipeline.
> >>>
> >>> Upcoming patch will make use of these fields.
> >>>
> >>> Signed-off-by: Numan Siddique <numans at ovn.org>
> >>> ---
> >>>  controller/pinctrl.c         |  49 +++++++++++++++
> >>>  include/ovn/actions.h        |   4 ++
> >>>  include/ovn/logical-fields.h |  18 ++++++
> >>>  lib/actions.c                | 118 +++++++++++++++++++++++++++++++++++
> >>>  lib/logical-fields.c         |  10 +++
> >>>  ovn-sb.xml                   |  37 +++++++++++
> >>>  tests/ovn.at                 |  27 ++++++++
> >>>  utilities/ovn-trace.c        |  28 +++++++++
> >>>  8 files changed, 291 insertions(+)
> >>>
> >>> diff --git a/controller/pinctrl.c b/controller/pinctrl.c
> >>> index 631d058458..bc16a82404 100644
> >>> --- a/controller/pinctrl.c
> >>> +++ b/controller/pinctrl.c
> >>> @@ -233,6 +233,11 @@ static void pinctrl_handle_put_icmp_frag_mtu(struct rconn *swconn,
> >>>                                               struct ofputil_packet_in *pin,
> >>>                                               struct ofpbuf *userdata,
> >>>                                               struct ofpbuf *continuation);
> >>> +static void pinctrl_handle_swap_src_dst_ip(struct rconn *swconn,
> >>> +                                           const struct flow *in_flow,
> >>> +                                           struct dp_packet *pkt_in,
> >>> +                                           struct ofputil_packet_in *pin,
> >>> +                                           struct ofpbuf *continuation);
> >>>  static void
> >>>  pinctrl_handle_event(struct ofpbuf *userdata)
> >>>      OVS_REQUIRES(pinctrl_mutex);
> >>> @@ -2835,6 +2840,11 @@ process_packet_in(struct rconn *swconn, const struct ofp_header *msg)
> >>>          ovs_mutex_unlock(&pinctrl_mutex);
> >>>          break;
> >>>
> >>> +    case ACTION_OPCODE_SWAP_SRC_DST_IP:
> >>> +        pinctrl_handle_swap_src_dst_ip(swconn, &headers, &packet, &pin,
> >>> +                                       &continuation);
> >>> +        break;
> >>> +
> >>>      default:
> >>>          VLOG_WARN_RL(&rl, "unrecognized packet-in opcode %"PRIu32,
> >>>                       ntohl(ah->opcode));
> >>> @@ -6508,3 +6518,42 @@ pinctrl_handle_svc_check(struct rconn *swconn, const struct flow *ip_flow,
> >>>          svc_mon->next_send_time = time_msec() + svc_mon->interval;
> >>>      }
> >>>  }
> >>> +
> >>> +static void
> >>> +pinctrl_handle_swap_src_dst_ip(struct rconn *swconn,
> >>> +                               const struct flow *in_flow,
> >>> +                               struct dp_packet *pkt_in,
> >>> +                               struct ofputil_packet_in *pin,
> >>> +                               struct ofpbuf *continuation)
> >>> +{
> >>> +    enum ofp_version version = rconn_get_version(swconn);
> >>> +    enum ofputil_protocol proto = ofputil_protocol_from_ofp_version(version);
> >>> +    struct dp_packet *pkt_out;
> >>> +
> >>> +    pkt_out = dp_packet_clone(pkt_in);
> >>> +    pkt_out->l2_5_ofs = pkt_in->l2_5_ofs;
> >>> +    pkt_out->l2_pad_size = pkt_in->l2_pad_size;
> >>> +    pkt_out->l3_ofs = pkt_in->l3_ofs;
> >>> +    pkt_out->l4_ofs = pkt_in->l4_ofs;
> >>> +
> >>> +    if (get_dl_type(in_flow) == htons(ETH_TYPE_IP)) {
> >>> +        /* IPv4 packet. Swap nw_src with nw_dst. */
> >>> +        packet_set_ipv4(pkt_out, in_flow->nw_dst, in_flow->nw_src,
> >>> +                        in_flow->nw_tos, in_flow->nw_ttl);
> >>> +    } else {
> >>> +        /* IPv6 packet. Swap ip6_src with ip6_dst.
> >>> +         * We could also use packet_set_ipv6() here, but that would require
> >>> +         * to extract the 'tc' and 'label' from in_nh->ip6_flow which seems
> >>> +         * unnecessary. */
> >>> +        struct ovs_16aligned_ip6_hdr *out_nh = dp_packet_l3(pkt_out);
> >>> +        union ovs_16aligned_in6_addr tmp = out_nh->ip6_src;
> >>> +        out_nh->ip6_src = out_nh->ip6_dst;
> >>> +        out_nh->ip6_dst = tmp;
> >>> +    }
> >>> +
> >>> +    pin->packet = dp_packet_data(pkt_out);
> >>> +    pin->packet_len = dp_packet_size(pkt_out);
> >>> +
> >>> +    queue_msg(swconn, ofputil_encode_resume(pin, continuation, proto));
> >>> +    dp_packet_delete(pkt_out);
> >>> +}
> >>> diff --git a/include/ovn/actions.h b/include/ovn/actions.h
> >>> index b4e5acabb9..bf1fe848b7 100644
> >>> --- a/include/ovn/actions.h
> >>> +++ b/include/ovn/actions.h
> >>> @@ -97,6 +97,7 @@ struct ovn_extend_table;
> >>>      OVNACT(DHCP6_REPLY,       ovnact_null)            \
> >>>      OVNACT(ICMP6_ERROR,       ovnact_nest)            \
> >>>      OVNACT(REJECT,            ovnact_nest)            \
> >>> +    OVNACT(OVNFIELD_EXCHANGE, ovnact_move)            \
> >>>
> >>>  /* enum ovnact_type, with a member OVNACT_<ENUM> for each action. */
> >>>  enum OVS_PACKED_ENUM ovnact_type {
> >>> @@ -612,6 +613,9 @@ enum action_opcode {
> >>>       * The actions, in OpenFlow 1.3 format, follow the action_header.
> >>>       */
> >>>      ACTION_OPCODE_REJECT,
> >>> +
> >>> +    /* ip.src <-> ip.dst */
> >>> +    ACTION_OPCODE_SWAP_SRC_DST_IP,
> >>>  };
> >>>
> >>>  /* Header. */
> >>> diff --git a/include/ovn/logical-fields.h b/include/ovn/logical-fields.h
> >>> index ac6f2f909b..bb6daa50ca 100644
> >>> --- a/include/ovn/logical-fields.h
> >>> +++ b/include/ovn/logical-fields.h
> >>> @@ -116,6 +116,24 @@ enum ovn_field_id {
> >>>       */
> >>>      OVN_ICMP6_FRAG_MTU,
> >>>
> >>> +    /*
> >>> +     * Name: "ip.src"
> >>> +     * Type: be128
> >>> +     * Description: Sets the field MFF_IPV4_SRC if eth.type == 0x800 (IPv4)
> >>> +     *              or sets the field MFF_IPV6_SRC if
> >>> +     *              eth.type == 0x86dd (IPV6).
> >>> +     */
> >>> +    OVN_IP_SRC,
> >>> +
> >>> +    /*
> >>> +     * Name: "ip.dst"
> >>> +     * Type: be128
> >>> +     * Description: Sets the field MFF_IPV4_DST if eth.type == 0x800 (IPv4)
> >>> +     *              or sets the field MFF_IPV6_DST if
> >>> +     *              eth.type == 0x86dd (IPV6).
> >>> +     */
> >>> +    OVN_IP_DST,
> >>> +
> >>>      OVN_FIELD_N_IDS
> >>>  };
> >>>
> >>> diff --git a/lib/actions.c b/lib/actions.c
> >>> index 1e1bdeff24..e9c77d2a0a 100644
> >>> --- a/lib/actions.c
> >>> +++ b/lib/actions.c
> >>> @@ -371,12 +371,35 @@ ovnact_next_free(struct ovnact_next *a OVS_UNUSED)
> >>>  {
> >>>  }
> >>>
> >>> +static bool
> >>> +check_ovnfield_load(struct action_context *ctx, const struct expr_field *field)
> >>> +{
> >>> +    switch (field->symbol->ovn_field->id) {
> >>> +    case OVN_ICMP4_FRAG_MTU:
> >>> +    case OVN_ICMP6_FRAG_MTU:
> >>> +        return true;
> >>> +
> >>> +    case OVN_IP_SRC:
> >>> +    case OVN_IP_DST:
> >>> +        lexer_error(ctx->lexer, "Can't load a value to ovn field (%s).",
> >>> +                    field->symbol->name);
> >>> +        return false;
> >>> +
> >>> +    case OVN_FIELD_N_IDS:
> >>> +    default:
> >>> +        OVS_NOT_REACHED();
> >>> +    }
> >>> +}
> >>> +
> >>>  static void
> >>>  parse_LOAD(struct action_context *ctx, const struct expr_field *lhs)
> >>>  {
> >>>      size_t ofs = ctx->ovnacts->size;
> >>>      struct ovnact_load *load;
> >>>      if (lhs->symbol->ovn_field) {
> >>> +        if (!check_ovnfield_load(ctx, lhs)) {
> >>> +            return;
> >>> +        }
> >>>          load = ovnact_put_OVNFIELD_LOAD(ctx->ovnacts);
> >>>      } else {
> >>>          load = ovnact_put_LOAD(ctx->ovnacts);
> >>> @@ -474,6 +497,46 @@ format_EXCHANGE(const struct ovnact_move *move, struct ds *s)
> >>>      format_assignment(move, "<->", s);
> >>>  }
> >>>
> >>> +static void
> >>> +parse_ovnfield_exchange(struct action_context *ctx,
> >>> +                        const struct expr_field *lhs,
> >>> +                        const struct expr_field *rhs)
> >>> +{
> >>> +    if (!lhs->symbol->ovn_field || !rhs->symbol->ovn_field) {
> >>> +        lexer_error(ctx->lexer,
> >>> +                    "Can't exchange ovn field with non ovn field (%s <-> %s).",
> >>> +                    lhs->symbol->name, rhs->symbol->name);
> >>> +        return;
> >>> +    }
> >>> +
> >>> +    if (lhs->symbol->ovn_field->id != OVN_IP_SRC &&
> >>> +            lhs->symbol->ovn_field->id != OVN_IP_DST) {
> >>> +        lexer_error(ctx->lexer,
> >>> +                    "Can't exchange ovn field (%s) with ovn field (%s).",
> >>> +                    lhs->symbol->name, rhs->symbol->name);
> >>> +        return;
> >>> +    }
> >>> +
> >>> +    if (rhs->symbol->ovn_field->id != OVN_IP_SRC &&
> >>> +            rhs->symbol->ovn_field->id != OVN_IP_DST) {
> >>> +        lexer_error(ctx->lexer,
> >>> +                    "Can't exchange ovn field (%s) with ovn field (%s).",
> >>> +                    lhs->symbol->name, rhs->symbol->name);
> >>> +        return;
> >>> +    }
> >>> +
> >>> +    if (lhs->symbol->ovn_field->id == rhs->symbol->ovn_field->id) {
> >>> +        lexer_error(ctx->lexer,
> >>> +                    "Can't exchange ovn field (%s) with ovn field (%s).",
> >>> +                    lhs->symbol->name, rhs->symbol->name);
> >>> +        return;
> >>> +    }
> >>> +
> >>> +    struct ovnact_move *move = ovnact_put_OVNFIELD_EXCHANGE(ctx->ovnacts);
> >>> +    move->lhs = *lhs;
> >>> +    move->rhs = *rhs;
> >>> +}
> >>> +
> >>>  static void
> >>>  parse_assignment_action(struct action_context *ctx, bool exchange,
> >>>                          const struct expr_field *lhs)
> >>> @@ -483,6 +546,11 @@ parse_assignment_action(struct action_context *ctx, bool exchange,
> >>>          return;
> >>>      }
> >>>
> >>> +    if (exchange && (lhs->symbol->ovn_field || rhs.symbol->ovn_field)) {
> >>> +        parse_ovnfield_exchange(ctx, lhs, &rhs);
> >>> +        return;
> >>> +    }
> >>> +
> >>>      const struct expr_symbol *ls = lhs->symbol;
> >>>      const struct expr_symbol *rs = rhs.symbol;
> >>>      if ((ls->width != 0) != (rs->width != 0)) {
> >>> @@ -3128,6 +3196,8 @@ format_OVNFIELD_LOAD(const struct ovnact_load *load , struct ds *s)
> >>>                        ntohs(load->imm.value.be16_int));
> >>>          break;
> >>>
> >>> +    case OVN_IP_SRC:
> >>> +    case OVN_IP_DST:
> >>>      case OVN_FIELD_N_IDS:
> >>>      default:
> >>>          OVS_NOT_REACHED();
> >>> @@ -3157,6 +3227,9 @@ encode_OVNFIELD_LOAD(const struct ovnact_load *load,
> >>>          encode_finish_controller_op(oc_offset, ofpacts);
> >>>          break;
> >>>      }
> >>> +
> >>> +    case OVN_IP_SRC:
> >>> +    case OVN_IP_DST:
> >>>      case OVN_FIELD_N_IDS:
> >>>      default:
> >>>          OVS_NOT_REACHED();
> >>> @@ -3451,6 +3524,51 @@ ovnact_fwd_group_free(struct ovnact_fwd_group *fwd_group)
> >>>      free(fwd_group->child_ports);
> >>>  }
> >>>
> >>> +static void
> >>> +format_OVNFIELD_EXCHANGE(const struct ovnact_move *move , struct ds *s)
> >>> +{
> >>> +    const struct ovn_field *lhs = ovn_field_from_name(move->lhs.symbol->name);
> >>> +    const struct ovn_field *rhs = ovn_field_from_name(move->rhs.symbol->name);
> >>> +    switch (lhs->id) {
> >>> +    case OVN_IP_SRC:
> >>> +    case OVN_IP_DST:
> >>> +        break;
> >>> +
> >>> +    case OVN_ICMP4_FRAG_MTU:
> >>> +    case OVN_ICMP6_FRAG_MTU:
> >>> +    case OVN_FIELD_N_IDS:
> >>> +    default:
> >>> +        OVS_NOT_REACHED();
> >>> +    }
> >>
> >> Nit: I would use the shorter:
> >> ovs_asssert(lhs->id == OVN_IP_SRC || lhs->id == OVN_IP_DST);
> >
> > You mean to drop the switch right ? If so, Ack.
> >
>
> Right, I meant ovs_assert instead of switch.
>
> >
> >>
> >>> +
> >>> +    switch (rhs->id) {
> >>> +    case OVN_IP_SRC:
> >>> +    case OVN_IP_DST:
> >>> +        break;
> >>> +
> >>> +    case OVN_ICMP4_FRAG_MTU:
> >>> +    case OVN_ICMP6_FRAG_MTU:
> >>> +    case OVN_FIELD_N_IDS:
> >>> +    default:
> >>> +        OVS_NOT_REACHED();
> >>> +    }
> >>
> >> Nit: I would use the shorter:
> >> ovs_asssert(rhs->id == OVN_IP_SRC || rhs->id == OVN_IP_DST);
> >>
> >>> +
> >>> +    ds_put_format(s, "%s <-> %s;", lhs->name, rhs->name);
> >>> +}
> >>> +
> >>> +static void
> >>> +encode_OVNFIELD_EXCHANGE(const struct ovnact_move *move OVS_UNUSED,
> >>> +                         const struct ovnact_encode_params *ep OVS_UNUSED,
> >>> +                         struct ofpbuf *ofpacts OVS_UNUSED)
> >>> +{
> >>> +    /* Right now we only support exchanging the IPs in
> >>> +     * OVN fields (ip.src <-> ip.dst). */
> >>> +    size_t oc_offset =
> >>> +        encode_start_controller_op(ACTION_OPCODE_SWAP_SRC_DST_IP,
> >>> +                                   true, NX_CTLR_NO_METER, ofpacts);
> >>> +    encode_finish_controller_op(oc_offset, ofpacts);
> >>
> >> I think this means that all packets matching a flow with action "reject { ...
> >> ip.src <-> ip.dst ... }" will generate two packet-ins, right? One for the
> >> reject action, one for the ovnfield-exchange action.
> >>
> >> Is that a concern wrt. performance?
> >
> > Yes. It would have 2 packet-ins. Just like how we handle - icmp4 {...
> > icmp4.frag_mtu = 1500; ...};
> >
> > If performance is a concern, we could just drop ... ip.src <-> ip.dst
> > in reject and let reject action
> > swap the ip src with ip destination. I thought about that and my take
> > is that since reject { } results in
> > TCP RST or ICMP unreachable packet, it should be fine. I see these
> > packets as more of control packets.
> >
> > I think it should be ok. Let me know what you think.
> >
>
> I think I like the approach of "reject" action implicitly swapping IPs best.
> In the end it's not like we could implement reject withough swapping IP dst
> with IP src so why not do it as part of the reject action.
>

Agree. reject action is expected to be used to send the generated tcp
rst/icmp unreachable
packet back to the sender.

I'm ok to change the reject action to just swap the IPs internally if
everyone is fine.

@Mark Michelson  @Han Zhou  Do you have any comments here ?

Option 1 - reject { ...}    -> The reject action handling in pinctrl.c
will swap the ip source and destination

Option 2: reject {... ip.src <-> ip.dst ...} which is the proposed
approach in this patch series. This results in
2 packet-ins.

I personally prefer (2) since in OVN we normally tell what inner
actions to apply for many OVN actions.
But I have no strong preference and I'm fine changing to (1).

If we chose option (1), we could add a comment inside the action like
- reject { /* ip.src <-> ip.dst is done implicitly*/,  eth.src <->
eth.dst; output ; }


> But on the other hand, I think there might be other simpler ways to generate a
> lot of packet-ins towards ovn-controller that I don't have a strong preference
> about either solution.  I just wanted to make sure we discuss the performance
> implications.

In my opinion there should not be any performance implications.


>
> >
> >>
> >>> +}
> >>> +
> >>>  /* Parses an assignment or exchange or put_dhcp_opts action. */
> >>>  static void
> >>>  parse_set_action(struct action_context *ctx)
> >>> diff --git a/lib/logical-fields.c b/lib/logical-fields.c
> >>> index bf61df7719..d6f1981f52 100644
> >>> --- a/lib/logical-fields.c
> >>> +++ b/lib/logical-fields.c
> >>> @@ -33,6 +33,14 @@ const struct ovn_field ovn_fields[OVN_FIELD_N_IDS] = {
> >>>          OVN_ICMP6_FRAG_MTU,
> >>>          "icmp6.frag_mtu",
> >>>          4, 32,
> >>> +    }, {
> >>> +        OVN_IP_SRC,
> >>> +        "ip.src",
> >>> +        16, 128,
> >>> +    }, {
> >>> +        OVN_IP_DST,
> >>> +        "ip.dst",
> >>> +        16, 128,
> >>
> >> Just partially related to your change, I'm a bit confused by the meaning of
> >> n_bytes and n_bits in "struct ovn_field".  It seems to me that we never use
> >> those values.  Is that the case or am I missing something?
> >
> > These OVN fields are defined more like the way - mf_fields are defined.
> > Like icmp4.frag_mtu is 2 bytes and 16 bits field.
> >
> > So ip.src/ip.dst can be used for both ipv4 and ipv6, I have set the
> > size of ipv6.
> >
> > Since we don't support ip.src = 10.0.0.4 or ip.src = aef00::4 for
> > example, these fields
> > are not used. Later on if there is a need to support assigning a value
> > to these fields, these fields
> > could be used. Although I don't see a need to support it since we
> > already have ip4.src/ip

> >
>
> Ok, my question was more about the fact that I don't see the ovn_field.n_bytes
> or ovn_fields.n_bits being used anywhere in general (not referring to
> ip.src/ip.dst only).
>

Actually they are being used. See
https://github.com/ovn-org/ovn/blob/master/lib/actions.c#L394
and https://github.com/ovn-org/ovn/blob/master/lib/expr.c#L569

If you add the below in the ovn -- action parsing test case in ovn.at
---
icmp4.frag_mtu = 65536;
---

You'll see the below error:
17-bit constant is not compatible with 16-bit field icmp4.frag_mtu.

Thanks
Numan


> Thanks,
> Dumitru
>
> >
> > Thanks for the review.
> >
> > Numan
> >
> >>
> >
> >
> >> Thanks,
> >> Dumitru
> >>
> >>>      },
> >>>  };
> >>>
> >>> @@ -271,6 +279,8 @@ ovn_init_symtab(struct shash *symtab)
> >>>
> >>>      expr_symtab_add_ovn_field(symtab, "icmp4.frag_mtu", OVN_ICMP4_FRAG_MTU);
> >>>      expr_symtab_add_ovn_field(symtab, "icmp6.frag_mtu", OVN_ICMP6_FRAG_MTU);
> >>> +    expr_symtab_add_ovn_field(symtab, "ip.src", OVN_IP_SRC);
> >>> +    expr_symtab_add_ovn_field(symtab, "ip.dst", OVN_IP_DST);
> >>>  }
> >>>
> >>>  const char *
> >>> diff --git a/ovn-sb.xml b/ovn-sb.xml
> >>> index 2fc84f54ee..73ee543bfe 100644
> >>> --- a/ovn-sb.xml
> >>> +++ b/ovn-sb.xml
> >>> @@ -1258,6 +1258,43 @@
> >>>              except that the two values are exchanged instead of copied.  Both
> >>>              <var>field1</var> and <var>field2</var> must modifiable.
> >>>            </p>
> >>> +
> >>> +          <p>
> >>> +            <code>OVN</code> supports exchange of below OVN logical fields.
> >>> +          </p>
> >>> +
> >>> +          <ul>
> >>> +            <li>
> >>> +              <code>ip.src</code>
> >>> +              <code>ip.dst</code>
> >>> +              <p>
> >>> +                These fields can be used to refer to IP source and destination
> >>> +                fields which are IP version independent. These fields can be
> >>> +                used only for exchange of values.
> >>> +              </p>
> >>> +            </li>
> >>> +
> >>> +            <li>
> >>> +              <p>
> >>> +                Below are few examples:
> >>> +              </p>
> >>> +
> >>> +              <p>
> >>> +                match = "ip && tcp"
> >>> +                action = "ip.src <-> ip.dst; next;"
> >>> +              </p>
> >>> +
> >>> +              <p>
> >>> +                match = "ip4 || ip6"
> >>> +                action = reject { ip.src <-> ip.dst; } next;"
> >>> +              </p>
> >>> +
> >>> +              <p>
> >>> +                match = "ip && (tcp || udp)"
> >>> +                action = "ip.src <-> ip.dst; next;"
> >>> +              </p>
> >>> +            </li>
> >>> +          </ul>
> >>>          </dd>
> >>>
> >>>          <dt><code>ip.ttl--;</code></dt>
> >>> diff --git a/tests/ovn.at b/tests/ovn.at
> >>> index 71837a6721..c40d69c5e9 100644
> >>> --- a/tests/ovn.at
> >>> +++ b/tests/ovn.at
> >>> @@ -1605,6 +1605,33 @@ reject { };
> >>>      formats as reject { drop; };
> >>>      encodes as controller(userdata=00.00.00.16.00.00.00.00)
> >>>
> >>> +ip.src <-> ip.dst;
> >>> +    encodes as controller(userdata=00.00.00.17.00.00.00.00,pause)
> >>> +
> >>> +ip.src <-> ip.dst
> >>> +    Syntax error at end of input expecting `;'.
> >>> +
> >>> +ip.src = 10.0.0.10;
> >>> +    Can't load a value to ovn field (ip.src).
> >>> +
> >>> +ip.dst = aef0::4;
> >>> +    Can't load a value to ovn field (ip.dst).
> >>> +
> >>> +ip.src <-> ip4.dst;
> >>> +    Can't exchange ovn field with non ovn field (ip.src <-> ip4.dst).
> >>> +
> >>> +ip6.src <-> ip.dst;
> >>> +    Can't exchange ovn field with non ovn field (ip6.src <-> ip.dst).
> >>> +
> >>> +ip.src <-> icmp4.frag_mtu;
> >>> +    Can't exchange ovn field (ip.src) with ovn field (icmp4.frag_mtu).
> >>> +
> >>> +icmp6.frag_mtu <-> ip.dst;
> >>> +    Can't exchange ovn field (icmp6.frag_mtu) with ovn field (ip.dst).
> >>> +
> >>> +ip.src <-> ip.src;
> >>> +    Can't exchange ovn field (ip.src) with ovn field (ip.src).
> >>> +
> >>>  # trigger_event
> >>>  trigger_event(event = "empty_lb_backends", vip = "10.0.0.1:80", protocol = "tcp", load_balancer = "12345678-abcd-9876-fedc-11119f8e7d6c");
> >>>      encodes as controller(userdata=00.00.00.0f.00.00.00.00.00.00.00.00.00.01.00.0b.31.30.2e.30.2e.30.2e.31.3a.38.30.00.02.00.03.74.63.70.00.03.00.24.31.32.33.34.35.36.37.38.2d.61.62.63.64.2d.39.38.37.36.2d.66.65.64.63.2d.31.31.31.31.39.66.38.65.37.64.36.63)
> >>> diff --git a/utilities/ovn-trace.c b/utilities/ovn-trace.c
> >>> index 38aee6081b..ed7d8bf278 100644
> >>> --- a/utilities/ovn-trace.c
> >>> +++ b/utilities/ovn-trace.c
> >>> @@ -2147,12 +2147,35 @@ execute_ovnfield_load(const struct ovnact_load *load,
> >>>                               ntohs(load->imm.value.be16_int));
> >>>          break;
> >>>      }
> >>> +
> >>> +    case OVN_IP_SRC:
> >>> +    case OVN_IP_DST:
> >>>      case OVN_FIELD_N_IDS:
> >>>      default:
> >>>          OVS_NOT_REACHED();
> >>>      }
> >>>  }
> >>>
> >>> +static void
> >>> +execute_ovnfield_exchange(const struct ovnact_move *move OVS_UNUSED,
> >>> +                          struct flow *uflow,
> >>> +                          struct ovs_list *super)
> >>> +{
> >>> +    /* Right now we support exchanging of ip.src with ip.dst. */
> >>> +    ovntrace_node_append(super, OVNTRACE_NODE_MODIFY,
> >>> +                         "ip.src <-> ip.dst");
> >>> +
> >>> +    if (get_dl_type(uflow) == htons(ETH_TYPE_IP)) {
> >>> +        ovs_be32 tmp = uflow->nw_dst;
> >>> +        uflow->nw_dst = uflow->nw_src;
> >>> +        uflow->nw_src = tmp;
> >>> +    } else {
> >>> +        struct in6_addr tmp = uflow->ipv6_dst;
> >>> +        uflow->ipv6_dst = uflow->ipv6_src;
> >>> +        uflow->ipv6_src = tmp;
> >>> +    }
> >>> +}
> >>> +
> >>>  static void
> >>>  trace_actions(const struct ovnact *ovnacts, size_t ovnacts_len,
> >>>                const struct ovntrace_datapath *dp, struct flow *uflow,
> >>> @@ -2369,6 +2392,11 @@ trace_actions(const struct ovnact *ovnacts, size_t ovnacts_len,
> >>>                             pipeline, super);
> >>>              break;
> >>>
> >>> +        case OVNACT_OVNFIELD_EXCHANGE:
> >>> +            execute_ovnfield_exchange(ovnact_get_OVNFIELD_EXCHANGE(a),
> >>> +                                      uflow, super);
> >>> +            break;
> >>> +
> >>>          case OVNACT_TRIGGER_EVENT:
> >>>              break;
> >>>
> >>>
> >>
> >> _______________________________________________
> >> dev mailing list
> >> dev at openvswitch.org
> >> https://mail.openvswitch.org/mailman/listinfo/ovs-dev
> >>
> >
>
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