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view auto/cc/gcc @ 9191:618132842e7c
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 | 9eefb38f0005 |
children |
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# Copyright (C) Igor Sysoev # Copyright (C) Nginx, Inc. # gcc 2.7.2.3, 2.8.1, 2.95.4, egcs-1.1.2 # 3.0.4, 3.1.1, 3.2.3, 3.3.2, 3.3.3, 3.3.4, 3.4.0, 3.4.2 # 4.0.0, 4.0.1, 4.1.0 NGX_GCC_VER=`$CC -v 2>&1 | grep 'gcc version' 2>&1 \ | sed -e 's/^.* version \(.*\)/\1/'` echo " + gcc version: $NGX_GCC_VER" have=NGX_COMPILER value="\"gcc $NGX_GCC_VER\"" . auto/define # Solaris 7's /usr/ccs/bin/as does not support "-pipe" CC_TEST_FLAGS="-pipe" ngx_feature="gcc -pipe switch" ngx_feature_name= ngx_feature_run=no ngx_feature_incs= ngx_feature_path= ngx_feature_libs= ngx_feature_test= . auto/feature CC_TEST_FLAGS= if [ $ngx_found = yes ]; then PIPE="-pipe" fi case "$NGX_MACHINE" in sun4u | sun4v | sparc | sparc64 ) # "-mcpu=v9" enables the "casa" assembler instruction CFLAGS="$CFLAGS -mcpu=v9" ;; esac # optimizations #NGX_GCC_OPT="-O2" #NGX_GCC_OPT="-Os" NGX_GCC_OPT="-O" #CFLAGS="$CFLAGS -fomit-frame-pointer" case $CPU in pentium) # optimize for Pentium and Athlon CPU_OPT="-march=pentium" NGX_CPU_CACHE_LINE=32 ;; pentiumpro | pentium3) # optimize for Pentium Pro, Pentium II and Pentium III CPU_OPT="-march=pentiumpro" NGX_CPU_CACHE_LINE=32 ;; pentium4) # optimize for Pentium 4, gcc 3.x CPU_OPT="-march=pentium4" NGX_CPU_CACHE_LINE=128 ;; athlon) # optimize for Athlon, gcc 3.x CPU_OPT="-march=athlon" NGX_CPU_CACHE_LINE=64 ;; opteron) # optimize for Opteron, gcc 3.x CPU_OPT="-march=opteron" NGX_CPU_CACHE_LINE=64 ;; sparc32) # build 32-bit UltraSparc binary CPU_OPT="-m32" CORE_LINK="$CORE_LINK -m32" NGX_CPU_CACHE_LINE=64 ;; sparc64) # build 64-bit UltraSparc binary CPU_OPT="-m64" CORE_LINK="$CORE_LINK -m64" NGX_CPU_CACHE_LINE=64 ;; ppc64) # build 64-bit PowerPC binary CPU_OPT="-m64" CPU_OPT="$CPU_OPT -falign-functions=32 -falign-labels=32" CPU_OPT="$CPU_OPT -falign-loops=32 -falign-jumps=32" CORE_LINK="$CORE_LINK -m64" NGX_CPU_CACHE_LINE=128 ;; esac CC_AUX_FLAGS="$CC_AUX_FLAGS $CPU_OPT" case "$NGX_GCC_VER" in 2.7*) # batch build CPU_OPT= ;; esac CFLAGS="$CFLAGS $PIPE $CPU_OPT" if [ ".$PCRE_OPT" = "." ]; then PCRE_OPT="-O2 -fomit-frame-pointer $PIPE $CPU_OPT" else PCRE_OPT="$PCRE_OPT $PIPE" fi if [ ".$ZLIB_OPT" = "." ]; then ZLIB_OPT="-O2 -fomit-frame-pointer $PIPE $CPU_OPT" else ZLIB_OPT="$ZLIB_OPT $PIPE" fi # warnings # -W requires at least -O CFLAGS="$CFLAGS ${NGX_GCC_OPT:--O} -W" CFLAGS="$CFLAGS -Wall -Wpointer-arith" #CFLAGS="$CFLAGS -Wconversion" #CFLAGS="$CFLAGS -Winline" #CFLAGS="$CFLAGS -Wmissing-prototypes" case "$NGX_GCC_VER" in 2.*) # we have a lot of the unused function arguments CFLAGS="$CFLAGS -Wno-unused" ;; *) # we have a lot of the unused function arguments CFLAGS="$CFLAGS -Wno-unused-parameter" # 4.2.1 shows the warning in wrong places #CFLAGS="$CFLAGS -Wunreachable-code" # deprecated system OpenSSL library on OS X if [ "$NGX_SYSTEM" = "Darwin" ]; then CFLAGS="$CFLAGS -Wno-deprecated-declarations" fi ;; esac # stop on warning CFLAGS="$CFLAGS -Werror" # debug CFLAGS="$CFLAGS -g" # DragonFly's gcc3 generates DWARF #CFLAGS="$CFLAGS -g -gstabs" if [ ".$CPP" = "." ]; then CPP="$CC -E" fi