Opened 18 months ago
Last modified 18 months ago
#2509 new enhancement
Support IPv6 interface identifiers outside of URLs
| Reported by: | Owned by: | ||
|---|---|---|---|
| Priority: | minor | Milestone: | |
| Component: | nginx-core | Version: | |
| Keywords: | Cc: | ||
| uname -a: | Linux somehost 6.3.6-0-hardened #1 SMP PREEMPT_DYNAMIC Wed, 07 Jun 2023 22:33:46 +0000 x86_64 GNU/Linux | ||
| nginx -V: |
nginx version: nginx/1.25.0
built with OpenSSL 3.1.1 30 May 2023 TLS SNI support enabled configure arguments: --prefix=/etc/nginx --conf-path=/etc/nginx/nginx.conf --sbin-path=/usr/bin/nginx --pid-path=/run/nginx.pid --lock-path=/run/lock/nginx.lock --user=http --group=http --http-log-path=/var/log/nginx/access.log --error-log-path=stderr --http-client-body-temp-path=/var/lib/nginx/client-body --http-proxy-temp-path=/var/lib/nginx/proxy --http-fastcgi-temp-path=/var/lib/nginx/fastcgi --http-scgi-temp-path=/var/lib/nginx/scgi --http-uwsgi-temp-path=/var/lib/nginx/uwsgi --with-cc-opt='-march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security -fstack-clash-protection -fcf-protection -g -ffile-prefix-map=/build/nginx-mainline/src=/usr/src/debug/nginx-mainline -flto=auto' --with-ld-opt='-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -flto=auto' --with-compat --with-debug --with-file-aio --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_degradation_module --with-http_flv_module --with-http_geoip_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_mp4_module --with-http_realip_module --with-http_secure_link_module --with-http_slice_module --with-http_ssl_module --with-http_stub_status_module --with-http_sub_module --with-http_v2_module --with-http_v3_module --with-mail --with-mail_ssl_module --with-pcre-jit --with-stream --with-stream_geoip_module --with-stream_realip_module --with-stream_ssl_module --with-stream_ssl_preread_module --with-threads |
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Description
As of version 1.25.0, nginx doesn't seem to support IPv6 interface identifiers at all, even outside of URLs. For example, when trying to use it with the "listen" directive in the "http server" context, I'm getting the following error:
2023/06/11 11:01:54 [emerg] 4542#4542: invalid IPv6 address in "[fe80::123%wg0]:443" of the "listen" directive in /etc/nginx/sites-enabled/test.conf
Even though there might be issues with supporting such address literals within URLs (as stated in #623 and #1422), these addresses would also be useful for other things that don't use URLs, for example for using IPv6 link-local addresses with the "listen" and "set_real_ip_from" directives in the "http server" and "stream server" contexts, or when using such addresses with the "server" directive in the "stream upstream" context.
Side note: It seems that trac doesn't allow setting the 1.24.x or 1.25.x versions when creating a new ticket.
As outlined in #623, IPv6 addresses with zone identifiers are not directly supported by nginx, though can be used by providing a name which maps to an appropriate limited-scope IPv6 address.
This approach is expected to work correctly in places where resulting sockaddr structure is directly used, such as in
proxy_pass,fastcgi_pass, andserverdirectives in the upstream blocks.It is not going to work in places where addresses are matched by nginx though. In particular:
set_real_ip_from. Inset_real_ip_from, scoped IPv6 addresses are actually recognized out of the box: nginx simply usesgetaddrinfo()for anything which isn't a valid IP address, and hence scoped IPv6 addresses are properly resolved. Only the IP addresses are used for subsequent matching though.listenaddresses in the http module, listening sockets with identical IPv6 addresses but with different zone identifiers will be considered by nginx as equivalent, as it doesn't try to compare sin6_scope_id. If addresses with different zone identifiers are used,bindshould be explicitly requested for each socket.Better support is more or less requires #1422, since more or less any address parsing in nginx (including
listenandserverin upstream blocks) uses the same URI parsing code.Additionally, comparison issues needs to be specifically addressed. I doubt we should try to do it for
set_real_ip_from, but might consider checkingsin6_scope_idfor listening sockets in http.