On Mon, Apr 24, 2017 at 10:04 PM, Guru Shetty <[email protected]> wrote:
>
>
> On 17 April 2017 at 08:13, <[email protected]> wrote:
>
>> From: Numan Siddique <[email protected]>
>>
>> This patch adds a new OVN action 'dns_lookup' to support native DNS.
>> ovn-controller parses this action and adds a NXT_PACKET_IN2
>> OF flow with 'pause' flag set.
>>
>> A new table 'DNS' is added in the SB DB to look up and resolve
>> the DNS queries. When a valid DNS packet is received by
>> ovn-controller, it looks up the DNS name in the 'DNS' table
>> and if successful, it frames a DNS reply, resumes the packet
>> and stores 1 in the 1-bit subfield. If the packet is invalid
>> or cannot be resolved, it resumes the packet without any
>> modifications and stores 0 in the 1-bit subfield.
>>
>> reg0[4] = dns_lookup(); next;
>>
>> An upcoming patch will use this action and adds logical flows.
>>
>> Signed-off-by: Numan Siddique <[email protected]>
>>
>
> Acked-by: Gurucharan Shetty <[email protected]>
>
> This needs a rebase as it does not apply on the tip of master.
>
> One comment inline.
>
>
>>
>>
>> + <table name="DNS" title="Native DNS resolution">
>> + <p>
>> + Each row in this table stores the DNS records. The OVN action
>> + <code>dns_lookup</code> uses this table for DNS resolution.
>> + </p>
>> +
>> + <column name="records">
>> + Key-value pair of DNS records with <code>hostname</code> as the key
>> + and a string of IP address(es) separated by comma or space as the
>> + value.
>>
>
> "hostname" feels like a misnomer as even LB VIPs can be programmed in the
> DNS table. A better option is to use "DNS name"?
>
Thanks for the review. I will rebase, update the key to "dnsname". Hope
this name is fine
Numan
>
>
>> +
>> + <p><b>Example: </b> "vm1.ovn.org" = "10.0.0.4 aef0::4"</p>
>> + </column>
>> +
>> + <column name="datapaths">
>> + The DNS records defined in the column <ref column="records"/> will
>> be
>> + applied only to the DNS queries originating from the datapaths
>> defined
>> + in this column.
>> + </column>
>> +
>> + <group title="Common Columns">
>> + <column name="external_ids">
>> + See <em>External IDs</em> at the beginning of this document.
>> + </column>
>> + </group>
>> + </table>
>> </database>
>> diff --git a/ovn/utilities/ovn-sbctl.c b/ovn/utilities/ovn-sbctl.c
>> index ffa931a..79a51e9 100644
>> --- a/ovn/utilities/ovn-sbctl.c
>> +++ b/ovn/utilities/ovn-sbctl.c
>> @@ -1056,6 +1056,9 @@ static const struct ctl_table_class
>> tables[SBREC_N_TABLES] = {
>>
>> [SBREC_TABLE_SSL].row_ids[0] =
>> {&sbrec_table_sb_global, NULL, &sbrec_sb_global_col_ssl},
>> +
>> + [SBREC_TABLE_DNS].row_ids[0] =
>> + {&sbrec_table_dns, NULL, &sbrec_dns_col_records},
>> };
>>
>>
>> diff --git a/ovn/utilities/ovn-trace.c b/ovn/utilities/ovn-trace.c
>> index 66844b1..b141203 100644
>> --- a/ovn/utilities/ovn-trace.c
>> +++ b/ovn/utilities/ovn-trace.c
>> @@ -1428,6 +1428,18 @@ execute_next(const struct ovnact_next *next,
>> trace__(dp, uflow, next->ltable, next->pipeline, super);
>> }
>>
>> +
>> +static void
>> +execute_dns_lookup(const struct ovnact_dns_lookup *dl, struct flow
>> *uflow,
>> + struct ovs_list *super)
>> +{
>> + struct mf_subfield sf = expr_resolve_field(&dl->dst);
>> + union mf_subvalue sv = { .u8_val = 0 };
>> + mf_write_subfield_flow(&sf, &sv, uflow);
>> + ovntrace_node_append(super, OVNTRACE_NODE_ERROR,
>> + "*** dns_lookup action not implemented");
>> +}
>> +
>> static void
>> trace_actions(const struct ovnact *ovnacts, size_t ovnacts_len,
>> const struct ovntrace_datapath *dp, struct flow *uflow,
>> @@ -1542,6 +1554,10 @@ trace_actions(const struct ovnact *ovnacts, size_t
>> ovnacts_len,
>> * though, it would be easy enough to track the queue
>> information
>> * by adjusting uflow->skb_priority. */
>> break;
>> +
>> + case OVNACT_DNS_LOOKUP:
>> + execute_dns_lookup(ovnact_get_DNS_LOOKUP(a), uflow, super);
>> + break;
>> }
>>
>> }
>> diff --git a/tests/ovn.at b/tests/ovn.at
>> index af77c19..53a2dd5 100644
>> --- a/tests/ovn.at
>> +++ b/tests/ovn.at
>> @@ -1027,6 +1027,13 @@ set_queue(61440);
>> set_queue(65535);
>> Queue ID 65535 for set_queue is not in valid range 0 to 61440.
>>
>> +# dns_lookup
>> +reg1[0] = dns_lookup();
>> + encodes as controller(userdata=00.00.00.0
>> 6.00.00.00.00.00.01.de.10.00.00.00.40,pause)
>> + has prereqs udp
>> +reg1[0] = dns_lookup("hostname");
>> + dns_lookup doesn't take any parameters
>> +
>> # Contradictionary prerequisites (allowed but not useful):
>> ip4.src = ip6.src[0..31];
>> encodes as move:NXM_NX_IPV6_SRC[0..31]->NXM_OF_IP_SRC[]
>> --
>> 2.9.3
>>
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>
>
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