documentation: Add rule action

docs/configuration/route/rule_action.md

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+---
+icon: material/new-box
+---
+
+# Rule Action
+
+!!! question "Since sing-box 1.11.0"
+
+## Final actions
+
+### route
+
+```json
+{
+  "action": "route", // default
+  "outbound": ""
+}
+```
+
+`route` inherits the classic rule behavior of routing connection to the specified outbound.
+
+#### outbound
+
+==Required==
+
+Tag of target outbound.
+
+### route-options
+
+```json
+{
+  "action": "route-options",
+  "udp_disable_domain_unmapping": false,
+  "udp_connect": false
+}
+```
+
+`route-options` set options for routing.
+
+#### udp_disable_domain_unmapping
+
+If enabled, for UDP proxy requests addressed to a domain,
+the original packet address will be sent in the response instead of the mapped domain.
+
+This option is used for compatibility with clients that
+do not support receiving UDP packets with domain addresses, such as Surge.
+
+#### udp_connect
+
+If enabled, attempts to connect UDP connection to the destination instead of listen.
+
+### reject
+
+```json
+{
+  "action": "reject",
+  "method": "default", // default
+  "no_drop": false
+}
+```
+
+`reject` reject connections
+
+The specified method is used for reject tun connections if `sniff` action has not been performed yet.
+
+For non-tun connections and already established connections, will just be closed.
+
+#### method
+
+- `default`: Reply with TCP RST for TCP connections, and ICMP port unreachable for UDP packets.
+- `drop`: Drop packets.
+
+#### no_drop
+
+If not enabled, `method` will be temporarily overwritten to `drop` after 50 triggers in 30s.
+
+Not available when `method` is set to drop.
+
+### hijack-dns
+
+```json
+{
+  "action": "hijack-dns"
+}
+```
+
+`hijack-dns` hijack DNS requests to the sing-box DNS module.
+
+## Non-final actions
+
+### sniff
+
+```json
+{
+  "action": "sniff",
+  "sniffer": [],
+  "timeout": ""
+}
+```
+
+`sniff` performs protocol sniffing on connections.
+
+For deprecated `inbound.sniff` options, it is considered to `sniff()` performed before routing.
+
+#### sniffer
+
+Enabled sniffers.
+
+All sniffers enabled by default.
+
+Available protocol values an be found on in [Protocol Sniff](../sniff/)
+
+#### timeout
+
+Timeout for sniffing.
+
+`300ms` is used by default.
+
+### resolve
+
+```json
+{
+  "action": "resolve",
+  "strategy": "",
+  "server": ""
+}
+```
+
+`resolve` resolve request destination from domain to IP addresses.
+
+#### strategy
+
+DNS resolution strategy, available values are: `prefer_ipv4`, `prefer_ipv6`, `ipv4_only`, `ipv6_only`.
+
+`dns.strategy` will be used by default.
+
+#### server
+
+Specifies DNS server tag to use instead of selecting through DNS routing.