Add proxy support for ICMP echo request

docs/configuration/route/rule.md

@@ -7,7 +7,8 @@ icon: material/new-box
     :material-plus: [interface_address](#interface_address)  
     :material-plus: [network_interface_address](#network_interface_address)  
     :material-plus: [default_interface_address](#default_interface_address)  
-    :material-plus: [preferred_by](#preferred_by)
+    :material-plus: [preferred_by](#preferred_by)  
+    :material-alert: [network](#network)
 
 !!! quote "Changes in sing-box 1.11.0"
 
@@ -226,7 +227,15 @@ Sniffed client type, see [Protocol Sniff](/configuration/route/sniff/) for detai
 
 #### network
 
-`tcp` or `udp`.
+!!! quote "Changes in sing-box 1.13.0"
+
+    Since sing-box 1.13.0, you can match ICMP echo (ping) requests via the new `icmp` network.
+    
+    Such traffic originates from `TUN`, `WireGuard`, and `Tailscale` inbounds and can be routed to `Direct`, `WireGuard`, and `Tailscale` outbounds.
+
+Match network type.
+
+`tcp`, `udp` or `icmp`.
 
 #### domain
 

docs/configuration/route/rule.zh.md

@@ -7,7 +7,8 @@ icon: material/new-box
     :material-plus: [interface_address](#interface_address)  
     :material-plus: [network_interface_address](#network_interface_address)  
     :material-plus: [default_interface_address](#default_interface_address)  
-    :material-plus: [preferred_by](#preferred_by)
+    :material-plus: [preferred_by](#preferred_by)  
+    :material-alert: [network](#network)
 
 !!! quote "sing-box 1.11.0 中的更改"
 
@@ -223,7 +224,15 @@ icon: material/new-box
 
 #### network
 
-`tcp` 或 `udp`。
+!!! quote "sing-box 1.13.0 中的更改"
+
+    自 sing-box 1.13.0 起，您可以通过新的 `icmp` 网络匹配 ICMP 回显（ping）请求。
+
+    此类流量源自 `TUN`、`WireGuard` 和 `Tailscale` 入站，并可路由至 `Direct`、`WireGuard` 和 `Tailscale` 出站。
+
+匹配网络类型。
+
+`tcp`、`udp` 或 `icmp`。
 
 #### domain
 

docs/configuration/route/rule_action.md

@@ -2,6 +2,10 @@
 icon: material/new-box
 ---
 
+!!! quote "Changes in sing-box 1.13.0"
+
+    :material-alert: [reject](#reject)
+
 !!! quote "Changes in sing-box 1.12.0"
 
     :material-plus: [tls_fragment](#tls_fragment)  
@@ -42,6 +46,10 @@ See `route-options` fields below.
 
 ### reject
 
+!!! quote "Changes in sing-box 1.13.0"
+
+    Since sing-box 1.13.0, you can reject (or directly reply to) ICMP echo (ping) requests using `reject` action.
+
 ```json
 {
   "action": "reject",
@@ -58,9 +66,17 @@ For non-tun connections and already established connections, will just be closed
 
 #### method
 
+For TCP and UDP connections:
+
 - `default`: Reply with TCP RST for TCP connections, and ICMP port unreachable for UDP packets.
 - `drop`: Drop packets.
 
+For ICMP echo requests:
+
+- `default`: Reply with ICMP host unreachable.
+- `drop`: Drop packets.
+- `reply`: Reply with ICMP echo reply.
+
 #### no_drop
 
 If not enabled, `method` will be temporarily overwritten to `drop` after 50 triggers in 30s.

docs/configuration/route/rule_action.zh.md

@@ -2,6 +2,10 @@
 icon: material/new-box
 ---
 
+!!! quote "sing-box 1.13.0 中的更改"
+
+    :material-alert: [reject](#reject)
+
 !!! quote "sing-box 1.12.0 中的更改"
 
     :material-plus: [tls_fragment](#tls_fragment)  
@@ -38,6 +42,10 @@ icon: material/new-box
 
 ### reject
 
+!!! quote "sing-box 1.13.0 中的更改"
+
+    自 sing-box 1.13.0 起，您可以通过 `reject` 动作拒绝（或直接回复）ICMP 回显（ping）请求。
+
 ```json
 {
   "action": "reject",
@@ -54,9 +62,17 @@ icon: material/new-box
 
 #### method
 
+对于 TCP 和 UDP 连接：
+
 - `default`: 对于 TCP 连接回复 RST，对于 UDP 包回复 ICMP 端口不可达。
 - `drop`: 丢弃数据包。
 
+对于 ICMP 回显请求：
+
+- `default`: 回复 ICMP 主机不可达。
+- `drop`: 丢弃数据包。
+- `reply`: 回复以 ICMP 回显应答。
+
 #### no_drop
 
 如果未启用，则 30 秒内触发 50 次后，`method` 将被暂时覆盖为 `drop`。