OpenWrt 21.02.0-rc3 - 第三个发行候选版 - 2021 年 6 月 17 日

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 OpenWrt 21.02.0-rc3, r16172-2aba3e9784
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OpenWrt是一个为嵌入式设备设计的一款Linux操作系统，它可以用于替换庞大数量的无线路由器 以及非网络设备的原厂固件。查看硬件支持表格获取更多 关于硬件支持的信息。如果你想知道更多关于OpenWrt项目的细节，可以查看 关于OpenWrt的页面。

在大部分情况下，使用系统升级工具可以将 OpenWrt 19.07 顺利的升级到 OpenWrt 21.02 并保留 配置文件，但我们还是建议您在升级之前备份一下您的配置。（参见下方的“升级”章节）

你可以在此下载到 OpenWrt 固件: https://downloads.openwrt.org/releases/21.02.0-rc3/

OpenWrt社区在此非常自豪地发布 OpenWrt 21.02 系列的首个发行候选版。这个版本相对于之前的 OpenWrt 19.07 做出了超过 5800 次修改，并已经持续开发了一年半。

此候选发行版相对于之前的 21.02.0-rc2 发行候选版 的变更为:

• 在安全模式下网络无法正常工作: FS#3866

• LuCI 网络 配置迁移工具现在可以迁移自定义桥接MAC地址了。

• Linux kernel updated to version 5.4.124 (from 5.4.119 in v21.02.0-rc2)
• mac80211 updated to version 5.10.42-1 (from 5.10.34-1 in v21.02.0-rc2)
• wireless-regdb updated to version 2021.04.21 (from 2020.11.20 in v21.02.0-rc2)

• opkg 优化了依赖丢失时显示的错误信息
• sdk, imagebuilder 的 json-c, libnl-tiny, libubox, ubus, uci 和 lua 软件包将标记为静态库并从发行构建中移除（不再打包）

• New devices SERCOMM NA502, Linksys EA8100 v1, Amped Wireless ALLY, Linksys E5600, JCG Q20, cudy WR2100, TP-Link Archer C6U v1 (EU), TP-Link Archer A6 v3, ZyXEL NR7101, ZTE MF283+
• Device fixes for Xiaomi Router 3 Pro, HILINK HLK-7628N, WD My Net Wi-Fi Range Extender, ALLNET ALL-WAP02860AC, Senao APs, TP-Link AD7200

我们在 19.07 版本中引入了 WPA3 支持，但其并没有预装到出厂镜像中。

现在在 21.02 版本中，我们默认预装了这些 WPA3 所需的软件包。

OpenWrt 现在默认启用了 TLS 功能并内置了 Mozilla 信任的证书，这也就意味着 wget 和 opkg 命令在不做额外操作的情况下可以直接获取 HTTPS 的资源了。 现在，opkg 下载服务器将默认使用 HTTPS 加密连接

OpenWrt 已经将默认的 SSL 库从 mbedTls 切换为 wolfSSL。你也可以手动安装并切换为 mbedTLS 或是 OpenSSL。

从 OpenWrt 19.07 升级到 OpenWRrt 21.02 的话，HTTP 请求会被重定向到 HTTPS。但如果是全新安装 OpenWrt 21.02，则不会启用重定向。你可以使用以下命令手动关闭重定向：

uci set uhttpd.main.redirect_https=0
uci commit uhttpd
service uhttpd reload

DSA stands for Distributed Switch Architecture and is the Linux standard to deal with configurable Ethernet switches.

OpenWrt 21.02 comes with initial support for DSA, which replaces the swconfig system that OpenWrt was using up until now. Not all targets have been ported: some devices still use swconfig while some devices already switched to DSA.

This is a significant change to how switch ports and VLANs are managed. As such, sysupgrade will not be able to convert existing swconfig configuration to DSA configuration (see “Upgrading” below).

以下设备在 OpenWrt 21.02 中会使用 DSA 管理的交换机:

• ath79 (only TP-Link TL-WR941ND)
• bcm4908
• gemini
• kirkwood
• mediatek (most boards)
• mvebu
• octeon
• ramips (mt7621 subtarget only)
• realtek

Due to new features being introduced and the general size increase of the Linux kernel, devices now need at least 8 MB of flash and 64 MB of RAM to run a default build of OpenWrt. More flash space is recommended for extensibility, see 8/64 warning

It is still possible to build custom OpenWrt images (e.g. using the ImageBuilder) that may fit devices with 4 MB of flash or 32 MB of RAM. However, the level of functionality will be reduced and there is no guarantee to stability. See OpenWrt on 4/32 devices for more details and guidance.

/etc/config/network 文件的网络配置语法有一些改动:

• config interface 中的选项 ifname 重命名至 device (因其本身定义的就是一个 设备（device）)
• config device 中的类型 bridge 和 ifname 重命名至 ports
• 安装自动生成的配置文件现在将第二层(config device)和第三层(config interface)的配置分开了。

为保证兼容性，旧语法的配置文件依旧支持，且不会在升级过程中自动转换。

但 LuCI 网络界面会尝试检测旧语法并将其转换为新的语法，因为 LuCI 只支持新语法配置文件的编辑。

新的配置文件范例:

config device
	option name 'br-lan'
	option type 'bridge'
	option macaddr '00:01:02:XX:XX:XX'
	list ports 'lan1'
	list ports 'lan2'
	list ports 'lan3'
	list ports 'lan4'
    
config interface 'lan'
	option device 'br-lan'
	option proto 'static'
	option ipaddr '192.168.1.1'
	option netmask '255.255.255.0'
	option ip6assign '60'

config device
	option name 'eth1'
	option macaddr '00:01:02:YY:YY:YY'

config interface 'wan'
	option device 'eth1'
	option proto 'dhcp'

config interface 'wan6'
	option device 'eth1'
	option proto 'dhcpv6'

在此范例中，DSA 设备使用了 lanX 接口名称，而非 DSA 设备将会继续使用老的 ethX 接口名称。

A new realtek target has been added, which is often found in managed switches. As a result, it is now possible to run OpenWrt on devices with a significant number of Ethernet ports. See supported devices for realtek.

In addition, new bcm4908 and rockchip targets have been added.

Support for many new boards was added to the existing targets.

The ar71xx target was deprecated in OpenWrt 19.07 and has been gradually replaced by ath79, see ar71xx-ath79 migration.

With OpenWrt 21.02, the ar71xx has now been removed and users must use ath79 instead. If you are still running with the ar71xx target, it is recommended to reinstall OpenWrt 21.02 from scratch. Users already on the ath79 target can use sysupgrade to upgrade to OpenWrt 21.02.

Other targets were also removed: cns3xxx, rb532 and samsung.

Network exposed user space applications are linked as position-independent executable (PIE) to allow full Address Space Layout Randomization (ASLR) support. This makes it harder for attackers to exploit OpenWrt. See Hardening build options for more details.

Multiple Linux kernel compile options, needed for Linux Containers (LXC) and procd-ujail are activated by default for most targets. This allows to use LXC and ujail with the normal release builds.

It is possible to compile OpenWrt with SELinux support. This is currently not activated by default.

: this should be updated for the final 21.02.0 release.

Core components have the following versions in 21.02.0:

• Updated toolchain:
  • musl libc 1.1.24
  • glibc 2.33
  • gcc 8.4.0
  • binutils 2.34
• Updated Linux kernel
  • 5.4.124 for all targets
• Network:
  • hostapd 2020-06-08, dnsmasq 2.85, dropbear 2020.81
  • cfg80211/mac80211 from kernel 5.10.42
  • wireguard backport from upstream Linux kernel
• System userland:
  • busybox 1.33.1

In addition to the listed applications, many others were also updated.

Sysupgrade can be used to upgrade a device from 19.07 to 21.02, and configuration will be preserved in most cases.

不支持从 18.06 升级到 21.02

There is no migration path for targets that switched from swconfig to DSA. In that case, sysupgrade will refuse to proceed with an appropriate error message:
Image version mismatch. image 1.1 device 1.0 Please wipe config during upgrade (force required) or reinstall. Config cannot be migrated from swconfig to DSA Image check failed

The default root file system partition size changed for targets/devices relying on booting from mass storage (HDD, USB flash, SD card, etc.), so MBR will change and any additional partition will be deleted when sysupgrading.

一如既往的衷心感谢各位活动的软件包维护者、测试者、文档编写者和支持者的贡献。

祝各位用得开心！

OpenWrt 社区