Mercurial > hg > nginx
view src/event/quic/bpf/bpfgen.sh @ 8906:41caf5410110 quic
QUIC: reject streams which we could not create.
The reasons why a stream may not be created by server currently include hitting
worker_connections limit and memory allocation error. Previously in these
cases the entire QUIC connection was closed and all its streams were shut down.
Now the new stream is rejected and existing streams continue working.
To reject an HTTP/3 request stream, RESET_STREAM and STOP_SENDING with
H3_REQUEST_REJECTED error code are sent to client. HTTP/3 uni streams and
Stream streams are not rejected.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Thu, 11 Nov 2021 19:07:00 +0300 |
parents | 7df607cb2d11 |
children |
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#!/bin/bash export LANG=C set -e if [ $# -lt 1 ]; then echo "Usage: PROGNAME=foo LICENSE=bar $0 <bpf object file>" exit 1 fi self=$0 filename=$1 funcname=$PROGNAME generate_head() { cat << END /* AUTO-GENERATED, DO NOT EDIT. */ #include <stddef.h> #include <stdint.h> #include "ngx_bpf.h" END } generate_tail() { cat << END ngx_bpf_program_t $PROGNAME = { .relocs = bpf_reloc_prog_$funcname, .nrelocs = sizeof(bpf_reloc_prog_$funcname) / sizeof(bpf_reloc_prog_$funcname[0]), .ins = bpf_insn_prog_$funcname, .nins = sizeof(bpf_insn_prog_$funcname) / sizeof(bpf_insn_prog_$funcname[0]), .license = "$LICENSE", .type = BPF_PROG_TYPE_SK_REUSEPORT, }; END } process_relocations() { echo "static ngx_bpf_reloc_t bpf_reloc_prog_$funcname[] = {" objdump -r $filename | awk '{ if (enabled && $NF > 0) { off = strtonum(sprintf("0x%s", $1)); name = $3; printf(" { \"%s\", %d },\n", name, off/8); } if ($1 == "OFFSET") { enabled=1; } }' echo "};" echo } process_section() { echo "static struct bpf_insn bpf_insn_prog_$funcname[] = {" echo " /* opcode dst src offset imm */" section_info=$(objdump -h $filename --section=$funcname | grep "1 $funcname") # dd doesn't know hex length=$(printf "%d" 0x$(echo $section_info | cut -d ' ' -f3)) offset=$(printf "%d" 0x$(echo $section_info | cut -d ' ' -f6)) for ins in $(dd if="$filename" bs=1 count=$length skip=$offset status=none | xxd -p -c 8) do opcode=0x${ins:0:2} srcdst=0x${ins:2:2} # bytes are dumped in LE order offset=0x${ins:6:2}${ins:4:2} # short immedi=0x${ins:14:2}${ins:12:2}${ins:10:2}${ins:8:2} # int dst="$(($srcdst & 0xF))" src="$(($srcdst & 0xF0))" src="$(($src >> 4))" opcode=$(printf "0x%x" $opcode) dst=$(printf "BPF_REG_%d" $dst) src=$(printf "BPF_REG_%d" $src) offset=$(printf "%d" $offset) immedi=$(printf "0x%x" $immedi) printf " { %4s, %11s, %11s, (int16_t) %6s, %10s },\n" $opcode $dst $src $offset $immedi done cat << END }; END } generate_head process_relocations process_section generate_tail