[#xxx] Add documentation for multinet settings

Signed-off-by: Alex Vanin <a.vanin@yadro.com>

config/config.env

@@ -133,3 +133,16 @@ HTTP_GW_CORS_ALLOW_HEADERS="*"
 HTTP_GW_CORS_EXPOSE_HEADERS="*"
 HTTP_GW_CORS_ALLOW_CREDENTIALS=false
 HTTP_GW_CORS_MAX_AGE=600
+
+# Multinet properties
+# Enable multinet support
+HTTP_GW_MULTINET_ENABLED=false
+# Strategy to pick source IP address
+HTTP_GW_MULTINET_BALANCER=roundrobin
+# Restrict requests with unknown destination subnet
+HTTP_GW_MULTINET_RESTRICT=false
+# Delay between ipv6 to ipv4 fallback switch
+HTTP_GW_MULTINET_FALLBACK_DELAY=300ms
+# List of subnets and IP addresses to use as source for those subnets
+HTTP_GW_MULTINET_SUBNETS_1_MASK=1.2.3.4/24
+HTTP_GW_MULTINET_SUBNETS_1_SOURCE_IPS=1.2.3.4 1.2.3.5

config/config.yaml

@@ -146,3 +146,20 @@ cors:
   expose_headers: []
   allow_credentials: false
   max_age: 600
+
+# Multinet properties
+multinet:
+  # Enable multinet support
+  enabled: false
+  # Strategy to pick source IP address
+  balancer: roundrobin
+  # Restrict requests with unknown destination subnet
+  restrict: false
+  # Delay between ipv6 to ipv4 fallback switch
+  fallback_delay: 300ms
+  # List of subnets and IP addresses to use as source for those subnets
+  subnets:
+    - mask: 1.2.3.4/24
+      source_ips:
+        - 1.2.3.4
+        - 1.2.3.5

docs/gate-configuration.md

@@ -58,6 +58,7 @@ $ cat http.log
 | `cache`          | [Cache configuration](#cache-section)                          |
 | `resolve_bucket` | [Bucket name resolving configuration](#resolve_bucket-section) |
 | `index_page`     | [Index page configuration](#index_page-section)                |
+| `multinet`       | [Multinet configuration](#multinet-section)                    |
 
 
 # General section
@@ -387,3 +388,42 @@ cors:
 | `expose_headers`    | `[]string` | yes           |               | Values for `Access-Control-Expose-Headers` headers.    |
 | `allow_credentials` | `bool`     | yes           | `false`       | Values for `Access-Control-Allow-Credentials` headers. |
 | `max_age`           | `int`      | yes           | `600`         | Values for `Access-Control-Max-Age ` headers.          |
+
+# `multinet` section
+
+Configuration of multinet support.
+
+```yaml
+multinet:
+   enabled: false
+   balancer: roundrobin
+   restrict: false
+   fallback_delay: 300ms
+   subnets:
+      - mask: 1.2.3.4/24
+        source_ips:
+           - 1.2.3.4
+           - 1.2.3.5
+```
+
+| Parameter        | Type                           | SIGHUP reload | Default value | Description                                                                                |
+|------------------|--------------------------------|---------------|---------------|--------------------------------------------------------------------------------------------|
+| `enabled`        | `bool`                         | yes           | `false`       | Enables multinet setting to manage source ip of outcoming requests.                        |
+| `balancer`       | `string`                       | yes           | `""`          | Strategy to pick source IP. By default picks first address. Supports `roundrobin` setting. |
+| `restrict`       | `bool`                         | yes           | `false`       | Restricts requests to an undefined subnets.                                                |
+| `fallback_delay` | `duration`                     | yes           | `300ms`       | Delay between IPv6 and IPv4 fallback stack switch.                                         |
+| `subnets`        | [[]Subnet](#subnet-subsection) | yes           |               | Set of subnets to apply multinet dial settings.                                            |
+
+#### `subnet` subsection
+
+```yaml
+- mask: 1.2.3.4/24
+  source_ips:
+    - 1.2.3.4
+    - 1.2.3.5
+```
+
+| Parameter    | Type       | SIGHUP reload | Default value | Description                                                          |
+|--------------|------------|---------------|---------------|----------------------------------------------------------------------|
+| `mask`       | `string`   | yes           |               | Destination subnet.                                                  |
+| `source_ips` | `[]string` | yes           |               | Array of source IP addresses to use when dialing destination subnet. |