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QUIC: ignore duplicate PATH_CHALLENGE frames. According to RFC 9000, an endpoint SHOULD NOT send multiple PATH_CHALLENGE frames in a single packet. The change adds a check to enforce this claim to optimize server behavior. Previously each PATH_CHALLENGE always resulted in a single response datagram being sent to client. The effect of this was however limited by QUIC flood protection. Also, PATH_CHALLENGE is explicitly disabled in Initial and Handshake levels, see RFC 9000, Table 3. However, technically it may be sent by client in 0-RTT over a new path without actual migration, even though the migration itself is prohibited during handshake. This allows client to coalesce multiple 0-RTT packets each carrying a PATH_CHALLENGE and end up with multiple PATH_CHALLENGEs per datagram. This again leads to suboptimal behavior, see above. Since the purpose of sending PATH_CHALLENGE frames in 0-RTT is unclear, these frames are now only allowed in 1-RTT. For 0-RTT they are silently ignored.
author Roman Arutyunyan <arut@nginx.com>
date Wed, 22 Nov 2023 14:48:12 +0400
parents 53ea5694d1cc
children
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


cat << END                                                    >> $NGX_MAKEFILE

$NGX_OBJS/src/http/modules/perl/ngx_http_perl_module.o: \\
		$NGX_OBJS/$ngx_perl_module

$NGX_OBJS/$ngx_perl_module: \\
		\$(CORE_DEPS) \$(HTTP_DEPS) \\
		src/http/modules/perl/ngx_http_perl_module.h \\
		$NGX_OBJS/src/http/modules/perl/Makefile
	cd $NGX_OBJS/src/http/modules/perl && \$(MAKE)

	rm -rf $NGX_OBJS/install_perl


$NGX_OBJS/src/http/modules/perl/Makefile: \\
		$NGX_AUTO_CONFIG_H \\
		src/core/nginx.h \\
		src/http/modules/perl/Makefile.PL \\
		src/http/modules/perl/nginx.pm \\
		src/http/modules/perl/nginx.xs \\
		src/http/modules/perl/typemap
	grep 'define NGINX_VERSION' src/core/nginx.h \\
		| sed -e 's/^.*"\(.*\)".*/\1/' > \\
		$NGX_OBJS/src/http/modules/perl/version
	sed "s/%%VERSION%%/\`cat $NGX_OBJS/src/http/modules/perl/version\`/" \\
		src/http/modules/perl/nginx.pm > \\
		$NGX_OBJS/src/http/modules/perl/nginx.pm
	cp -p src/http/modules/perl/nginx.xs $NGX_OBJS/src/http/modules/perl/
	cp -p src/http/modules/perl/typemap $NGX_OBJS/src/http/modules/perl/
	cp -p src/http/modules/perl/Makefile.PL $NGX_OBJS/src/http/modules/perl/

	cd $NGX_OBJS/src/http/modules/perl \\
		&& NGX_PM_CFLAGS="\$(NGX_PM_CFLAGS) -g $NGX_CC_OPT" \\
			NGX_PM_LDFLAGS="$NGX_LD_OPT \$(NGX_PM_LDFLAGS)" \\
			NGX_INCS="$CORE_INCS $NGX_OBJS $HTTP_INCS" \\
			NGX_DEPS="\$(CORE_DEPS) \$(HTTP_DEPS)" \\
		$NGX_PERL Makefile.PL \\
			LIB=$NGX_PERL_MODULES \\
			INSTALLSITEMAN3DIR=$NGX_PERL_MODULES_MAN

END