pwru: ebpf pwru tool addon for network diagnosis

pwru is ebpf based kernel tracing tool for network
issue diagnosis. pwru build issue on loongfire [0]

to prepare to run pwru on loongfire:

mount -t debugfs none /sys/kernel/debug
echo 0 > /proc/sys/kernel/kptr_restrict

[0]: https://github.com/cilium/pwru/issues/559#issuecomment-2949507451

Signed-off-by: Vinent Li <vincent.mc.li@gmail.com>

config/rootfiles/common/pwru

@@ -0,0 +1 @@
+usr/bin/pwru

lfs/pwru

@@ -0,0 +1,79 @@
+###############################################################################
+#                                                                             #
+# IPFire.org - A linux based firewall                                         #
+# Copyright (C) 2007-2023  IPFire Team  <info@ipfire.org>                     #
+# Copyright (C) 2025  BPFire Team  <vincent.mc.li@gmail.com>                  #
+#                                                                             #
+# This program is free software: you can redistribute it and/or modify        #
+# it under the terms of the GNU General Public License as published by        #
+# the Free Software Foundation, either version 3 of the License, or           #
+# (at your option) any later version.                                         #
+#                                                                             #
+# This program is distributed in the hope that it will be useful,             #
+# but WITHOUT ANY WARRANTY; without even the implied warranty of              #
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
+# GNU General Public License for more details.                                #
+#                                                                             #
+# You should have received a copy of the GNU General Public License           #
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
+#                                                                             #
+###############################################################################
+
+###############################################################################
+# Definitions
+###############################################################################
+
+include Config
+
+VER        = 1.0.10
+
+THISAPP    = pwru-$(VER)
+DL_FILE    = $(THISAPP).tar.gz
+DL_FROM    = $(URL_IPFIRE)
+DIR_APP    = $(DIR_SRC)/$(THISAPP)
+TARGET     = $(DIR_INFO)/$(THISAPP)
+
+###############################################################################
+# Top-level Rules
+###############################################################################
+
+objects = $(DL_FILE)
+
+$(DL_FILE) = $(DL_FROM)/$(DL_FILE)
+
+$(DL_FILE)_BLAKE2 = 1699525f31a0b0537d3b70896ed26568feab018796cb6744a6ee6e30788a6d0aee5441a38279473ffaf5c43ce7ae9db31c51d6a8f496e4fb03d6e58946b53d6b
+
+install : $(TARGET)
+
+check : $(patsubst %,$(DIR_CHK)/%,$(objects))
+
+download :$(patsubst %,$(DIR_DL)/%,$(objects))
+
+b2 : $(subst %,%_BLAKE2,$(objects))
+
+###############################################################################
+# Downloading, checking, b2sum
+###############################################################################
+
+$(patsubst %,$(DIR_CHK)/%,$(objects)) :
+	@$(CHECK)
+
+$(patsubst %,$(DIR_DL)/%,$(objects)) :
+	@$(LOAD)
+
+$(subst %,%_BLAKE2,$(objects)) :
+	@$(B2SUM)
+
+###############################################################################
+# Installation Details
+###############################################################################
+
+$(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
+	@$(PREBUILD)
+	@rm -rf $(DIR_APP) && cd $(DIR_SRC) && tar zxf $(DIR_DL)/$(DL_FILE)
+
+	cd $(DIR_APP) && TARGET_GOARCH=loong64 GOARCH=loong64 make pwru
+	cd $(DIR_APP) && cp -vf pwru /usr/bin/
+
+	@rm -rf $(DIR_APP)
+	@$(POSTBUILD)

make.sh

@@ -2096,6 +2096,7 @@ build_system() {
 	lfsmake2 libbpf-bootstrap
 	lfsmake2 bcc
 	lfsmake2 ply
+	lfsmake2 pwru
 	lfsmake2 xdp-tools
 	lfsmake2 loxilb
 	lfsmake2 loxicmd