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Add max conn limit to https3 (#8187)

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* Add max conn limit to https3

This PR adds max conn limit to https3, similiar to https

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Add Test to cover change

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Address review feedback

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Update README and setup

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Update plugin/https3/README.md

Co-authored-by: Ville Vesilehto <ville@vesilehto.fi>
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

---------

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
Co-authored-by: Ville Vesilehto <ville@vesilehto.fi>
This commit is contained in:
Yong Tang
2026-07-21 15:52:31 -07:00
committed by GitHub
parent 989a188d13
commit e0a8eb8a46
5 changed files with 223 additions and 15 deletions
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2
plugin/https3/README.md
View File

@@ -15,10 +15,12 @@ This plugin can only be used once per HTTPS3 listener block.
```txt
https3 {
max_streams POSITIVE_INTEGER
max_connections POSITIVE_INTEGER
}
```
* `max_streams` limits the number of concurrent QUIC streams per connection. This helps prevent unbounded streams on a single connection, exhausting server resources. The default value is 256 if not specified. Set to 0 to use underlying QUIC transport default.
* `max_connections` limits the number of concurrent HTTPS/3 connections accepted by the server. The default value is 200 if not specified. Connections above the configured limit are rejected. Set to 0 to disable the CoreDNS connection limit.
## Examples

16
plugin/https3/setup.go
View File

@@ -54,6 +54,22 @@ func parseDOH3(c *caddy.Controller) error {
return c.Err("max_streams already defined for this server block")
}
config.MaxHTTPS3Streams = &val
case "max_connections":
args := c.RemainingArgs()
if len(args) != 1 {
return c.ArgErr()
}
val, err := strconv.Atoi(args[0])
if err != nil {
return c.Errf("invalid max_connections value '%s': %v", args[0], err)
}
if val < 0 {
return c.Errf("max_connections must be a non-negative integer: %d", val)
}
if config.MaxHTTPS3Connections != nil {
return c.Err("max_connections already defined for this server block")
}
config.MaxHTTPS3Connections = &val
default:
return c.Errf("unknown property '%s'", c.Val())
}