[ovs-dev] [PATCH ovn] northd-ddlog: Add proxy arp flows for configured addresses in lsp router port.

Numan Siddique numans at ovn.org
Tue Jun 29 18:01:19 UTC 2021


Hi Ben,

This patch is not working as expected.   Need your help here.  Not very urgent.

Please see below.

Thanks
Numan

On Tue, Jun 29, 2021 at 12:09 PM <numans at ovn.org> wrote:
>
> From: Numan Siddique <numans at ovn.org>
>
> The commit [1] didn't add the ddlog part.
>
> [1] - 8087cbc7462("ovn-northd.c: Add proxy ARP support to OVN")
>
> Signed-off-by: Numan Siddique <numans at ovn.org>
> ---
>  northd/ovn.dl        |  1 +
>  northd/ovn.rs        | 13 +++++++++++++
>  northd/ovn_northd.dl | 38 ++++++++++++++++++++++++++++++++++++++
>  tests/ovn.at         |  4 ++--
>  4 files changed, 54 insertions(+), 2 deletions(-)
>
> diff --git a/northd/ovn.dl b/northd/ovn.dl
> index f23ea3b9e1..3c7a734ddb 100644
> --- a/northd/ovn.dl
> +++ b/northd/ovn.dl
> @@ -364,6 +364,7 @@ extern function is_dynamic_lsp_address(addr: string): bool
>  extern function extract_lsp_addresses(address: string): Option<lport_addresses>
>  extern function extract_addresses(address: string): Option<lport_addresses>
>  extern function extract_lrp_networks(mac: string, networks: Set<string>): Option<lport_addresses>
> +extern function extract_ip_addresses(address: string): Option<lport_addresses>
>
>  extern function split_addresses(addr: string): (Set<string>, Set<string>)
>
> diff --git a/northd/ovn.rs b/northd/ovn.rs
> index d44f83bc75..5f0939409c 100644
> --- a/northd/ovn.rs
> +++ b/northd/ovn.rs
> @@ -184,6 +184,18 @@ pub fn extract_lrp_networks(mac: &String, networks: &ddlog_std::Set<String>) ->
>      }
>  }
>
> +pub fn extract_ip_addresses(address: &String) -> ddlog_std::Option<lport_addresses> {
> +    unsafe {
> +        let mut laddrs: lport_addresses_c = Default::default();
> +        if ovn_c::extract_ip_addresses(string2cstr(address).as_ptr(),
> +                                       &mut laddrs as *mut lport_addresses_c) {
> +            ddlog_std::Option::Some{x: laddrs.into_ddlog()}
> +        } else {
> +            ddlog_std::Option::None
> +        }
> +    }
> +}
> +
>  pub fn ovn_internal_version() -> String {
>      unsafe {
>          let s = ovn_c::ovn_get_internal_version();
> @@ -623,6 +635,7 @@ mod ovn_c {
>          pub fn extract_addresses(address: *const raw::c_char, laddrs: *mut lport_addresses_c, ofs: *mut raw::c_int) -> bool;
>          pub fn extract_lrp_networks__(mac: *const raw::c_char, networks: *const *const raw::c_char,
>                                        n_networks: libc::size_t, laddrs: *mut lport_addresses_c) -> bool;
> +        pub fn extract_ip_addresses(address: *const raw::c_char, laddrs: *mut lport_addresses_c) -> bool;
>          pub fn destroy_lport_addresses(addrs: *mut lport_addresses_c);
>          pub fn is_dynamic_lsp_address(address: *const raw::c_char) -> bool;
>          pub fn split_addresses(addresses: *const raw::c_char, ip4_addrs: *mut ovs_svec, ipv6_addrs: *mut ovs_svec);
> diff --git a/northd/ovn_northd.dl b/northd/ovn_northd.dl
> index 52a6206a18..a7a327c7f0 100644
> --- a/northd/ovn_northd.dl
> +++ b/northd/ovn_northd.dl
> @@ -3360,6 +3360,44 @@ for (CheckLspIsUp[check_lsp_is_up]) {
>      }
>  }
>
> +Flow(.logical_datapath = sw._uuid,
> +         .stage            = s_SWITCH_IN_ARP_ND_RSP(),
> +         .priority         = 50,
> +         .__match          = __match,
> +         .actions          = __actions,
> +         .external_ids     = stage_hint(sp.lsp._uuid)) :-
> +
> +    sp in &SwitchPort(.sw = sw, .peer = Some{rp}),
> +    rp.is_enabled(),
> +    var proxy_ips = {
> +        match (sp.lsp.options.get("arp_proxy")) {
> +            None -> "",
> +            Some {addresses} -> {
> +                match (extract_ip_addresses(addresses)) {
> +                    None -> "",
> +                    Some{addr} -> {
> +                        var ip4_addrs = vec_empty();
> +                        for (ip4 in addr.ipv4_addrs) {
> +                            ip4_addrs.push("${ip4.addr}")
> +                        };
> +                        string_join(ip4_addrs, ",")
> +                    }
> +                }
> +            }

If the - sp.lsp.option.get("arp_proxy") has 2 IP addresses -
"10.0.0.4, 10.0.0.5",  then the above
code sets only "10.0.0.4" into the variable  "proxy_ips".  I was
expecting it to have "10.0.0.4,10.0.0.5".

I'm not sure if the issue is in "extract_ip_addresses" or somewhere else.


> +        }
> +    },
> +    proxy_ips != "",
> +    var __match = "arp.op == 1 && arp.tpa == {" ++ proxy_ips ++ "}",
> +    var __actions = "eth.dst = eth.src; "
> +                    "eth.src = ${rp.networks.ea}; "
> +                    "arp.op = 2; /* ARP reply */ "
> +                    "arp.tha = arp.sha; "
> +                    "arp.sha = %s; "
> +                    "arp.tpa <-> arp.spa; "
> +                    "outport = inport; "
> +                    "flags.loopback = 1; "
> +                    "output;".
> +
>  /* For ND solicitations, we need to listen for both the
>   * unicast IPv6 address and its all-nodes multicast address,
>   * but always respond with the unicast IPv6 address. */
> diff --git a/tests/ovn.at b/tests/ovn.at
> index db1a0a35c2..31f0b90996 100644
> --- a/tests/ovn.at
> +++ b/tests/ovn.at
> @@ -26940,7 +26940,7 @@ ovs-vsctl -- add-port br-int vif1 -- \
>  # And proxy ARP flows for 69.254.239.254 and 169.254.239.2
>  # and check that SB flows have been added.
>  ovn-nbctl --wait=hv add Logical_Switch_Port rp-ls1 \
> -options arp_proxy='"169.254.239.254 169.254.239.2"'
> +options arp_proxy='"169.254.239.254,169.254.239.2"'
>  ovn-sbctl dump-flows > sbflows
>  AT_CAPTURE_FILE([sbflows])
>
> @@ -26957,7 +26957,7 @@ AT_CHECK([ovn-sbctl dump-flows | grep ls_in_arp_rsp | grep "169.254.239.2"], [1]
>
>  # Add the flows back send arp request and check we see an ARP response
>  ovn-nbctl --wait=hv add Logical_Switch_Port rp-ls1 \
> -options arp_proxy='"169.254.239.254 169.254.239.2"'
> +options arp_proxy='"169.254.239.254,169.254.239.2"'
>
>  ls1_p1_mac=00:00:00:01:02:03
>  ls1_p1_ip=192.16.1.6
> --
> 2.31.1
>
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