Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

7 files changed, 269 insertions, 0 deletions

diff --git a/net/bpfilter/.gitignore b/net/bpfilter/.gitignore
new file mode 100644
index 000000000..f34e85ee8
--- /dev/null
+++ b/net/bpfilter/.gitignore
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+bpfilter_umh
diff --git a/net/bpfilter/Kconfig b/net/bpfilter/Kconfig
new file mode 100644
index 000000000..3d4a21462
--- /dev/null
+++ b/net/bpfilter/Kconfig
@@ -0,0 +1,23 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menuconfig BPFILTER
+	bool "BPF based packet filtering framework (BPFILTER)"
+	depends on BPF && INET
+	select USERMODE_DRIVER
+	help
+	  This builds experimental bpfilter framework that is aiming to
+	  provide netfilter compatible functionality via BPF
+
+if BPFILTER
+config BPFILTER_UMH
+	tristate "bpfilter kernel module with user mode helper"
+	depends on CC_CAN_LINK
+	depends on m || CC_CAN_LINK_STATIC
+	default m
+	help
+	  This builds bpfilter kernel module with embedded user mode helper
+
+	  Note: To compile this as built-in, your toolchain must support
+	  building static binaries, since rootfs isn't mounted at the time
+	  when __init functions are called and do_execv won't be able to find
+	  the elf interpreter.
+endif
diff --git a/net/bpfilter/Makefile b/net/bpfilter/Makefile
new file mode 100644
index 000000000..cdac82b8c
--- /dev/null
+++ b/net/bpfilter/Makefile
@@ -0,0 +1,20 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the Linux BPFILTER layer.
+#
+
+userprogs := bpfilter_umh
+bpfilter_umh-objs := main.o
+userccflags += -I $(srctree)/tools/include/ -I $(srctree)/tools/include/uapi
+
+ifeq ($(CONFIG_BPFILTER_UMH), y)
+# builtin bpfilter_umh should be linked with -static
+# since rootfs isn't mounted at the time of __init
+# function is called and do_execv won't find elf interpreter
+userldflags += -static
+endif
+
+$(obj)/bpfilter_umh_blob.o: $(obj)/bpfilter_umh
+
+obj-$(CONFIG_BPFILTER_UMH) += bpfilter.o
+bpfilter-objs += bpfilter_kern.o bpfilter_umh_blob.o
diff --git a/net/bpfilter/bpfilter_kern.c b/net/bpfilter/bpfilter_kern.c
new file mode 100644
index 000000000..422ec6e7c
--- /dev/null
+++ b/net/bpfilter/bpfilter_kern.c
@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: GPL-2.0
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/umh.h>
+#include <linux/bpfilter.h>
+#include <linux/sched.h>
+#include <linux/sched/signal.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include "msgfmt.h"
+
+extern char bpfilter_umh_start;
+extern char bpfilter_umh_end;
+
+static void shutdown_umh(void)
+{
+	struct umd_info *info = &bpfilter_ops.info;
+	struct pid *tgid = info->tgid;
+
+	if (tgid) {
+		kill_pid(tgid, SIGKILL, 1);
+		wait_event(tgid->wait_pidfd, thread_group_exited(tgid));
+		bpfilter_umh_cleanup(info);
+	}
+}
+
+static void __stop_umh(void)
+{
+	if (IS_ENABLED(CONFIG_INET))
+		shutdown_umh();
+}
+
+static int bpfilter_send_req(struct mbox_request *req)
+{
+	struct mbox_reply reply;
+	loff_t pos = 0;
+	ssize_t n;
+
+	if (!bpfilter_ops.info.tgid)
+		return -EFAULT;
+	pos = 0;
+	n = kernel_write(bpfilter_ops.info.pipe_to_umh, req, sizeof(*req),
+			   &pos);
+	if (n != sizeof(*req)) {
+		pr_err("write fail %zd\n", n);
+		goto stop;
+	}
+	pos = 0;
+	n = kernel_read(bpfilter_ops.info.pipe_from_umh, &reply, sizeof(reply),
+			&pos);
+	if (n != sizeof(reply)) {
+		pr_err("read fail %zd\n", n);
+		goto stop;
+	}
+	return reply.status;
+stop:
+	__stop_umh();
+	return -EFAULT;
+}
+
+static int bpfilter_process_sockopt(struct sock *sk, int optname,
+				    sockptr_t optval, unsigned int optlen,
+				    bool is_set)
+{
+	struct mbox_request req = {
+		.is_set		= is_set,
+		.pid		= current->pid,
+		.cmd		= optname,
+		.addr		= (uintptr_t)optval.user,
+		.len		= optlen,
+	};
+	if (sockptr_is_kernel(optval)) {
+		pr_err("kernel access not supported\n");
+		return -EFAULT;
+	}
+	return bpfilter_send_req(&req);
+}
+
+static int start_umh(void)
+{
+	struct mbox_request req = { .pid = current->pid };
+	int err;
+
+	/* fork usermode process */
+	err = fork_usermode_driver(&bpfilter_ops.info);
+	if (err)
+		return err;
+	pr_info("Loaded bpfilter_umh pid %d\n", pid_nr(bpfilter_ops.info.tgid));
+
+	/* health check that usermode process started correctly */
+	if (bpfilter_send_req(&req) != 0) {
+		shutdown_umh();
+		return -EFAULT;
+	}
+
+	return 0;
+}
+
+static int __init load_umh(void)
+{
+	int err;
+
+	err = umd_load_blob(&bpfilter_ops.info,
+			    &bpfilter_umh_start,
+			    &bpfilter_umh_end - &bpfilter_umh_start);
+	if (err)
+		return err;
+
+	mutex_lock(&bpfilter_ops.lock);
+	err = start_umh();
+	if (!err && IS_ENABLED(CONFIG_INET)) {
+		bpfilter_ops.sockopt = &bpfilter_process_sockopt;
+		bpfilter_ops.start = &start_umh;
+	}
+	mutex_unlock(&bpfilter_ops.lock);
+	if (err)
+		umd_unload_blob(&bpfilter_ops.info);
+	return err;
+}
+
+static void __exit fini_umh(void)
+{
+	mutex_lock(&bpfilter_ops.lock);
+	if (IS_ENABLED(CONFIG_INET)) {
+		shutdown_umh();
+		bpfilter_ops.start = NULL;
+		bpfilter_ops.sockopt = NULL;
+	}
+	mutex_unlock(&bpfilter_ops.lock);
+
+	umd_unload_blob(&bpfilter_ops.info);
+}
+module_init(load_umh);
+module_exit(fini_umh);
+MODULE_LICENSE("GPL");
diff --git a/net/bpfilter/bpfilter_umh_blob.S b/net/bpfilter/bpfilter_umh_blob.S
new file mode 100644
index 000000000..40311d10d
--- /dev/null
+++ b/net/bpfilter/bpfilter_umh_blob.S
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+	.section .init.rodata, "a"
+	.global bpfilter_umh_start
+bpfilter_umh_start:
+	.incbin "net/bpfilter/bpfilter_umh"
+	.global bpfilter_umh_end
+bpfilter_umh_end:
diff --git a/net/bpfilter/main.c b/net/bpfilter/main.c
new file mode 100644
index 000000000..291a92546
--- /dev/null
+++ b/net/bpfilter/main.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0
+#define _GNU_SOURCE
+#include <sys/uio.h>
+#include <errno.h>
+#include <stdio.h>
+#include <sys/socket.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include "../../include/uapi/linux/bpf.h"
+#include <asm/unistd.h>
+#include "msgfmt.h"
+
+FILE *debug_f;
+
+static int handle_get_cmd(struct mbox_request *cmd)
+{
+	switch (cmd->cmd) {
+	case 0:
+		return 0;
+	default:
+		break;
+	}
+	return -ENOPROTOOPT;
+}
+
+static int handle_set_cmd(struct mbox_request *cmd)
+{
+	return -ENOPROTOOPT;
+}
+
+static void loop(void)
+{
+	while (1) {
+		struct mbox_request req;
+		struct mbox_reply reply;
+		int n;
+
+		n = read(0, &req, sizeof(req));
+		if (n != sizeof(req)) {
+			fprintf(debug_f, "invalid request %d\n", n);
+			return;
+		}
+
+		reply.status = req.is_set ?
+			handle_set_cmd(&req) :
+			handle_get_cmd(&req);
+
+		n = write(1, &reply, sizeof(reply));
+		if (n != sizeof(reply)) {
+			fprintf(debug_f, "reply failed %d\n", n);
+			return;
+		}
+	}
+}
+
+int main(void)
+{
+	debug_f = fopen("/dev/kmsg", "w");
+	setvbuf(debug_f, 0, _IOLBF, 0);
+	fprintf(debug_f, "<5>Started bpfilter\n");
+	loop();
+	fclose(debug_f);
+	return 0;
+}
diff --git a/net/bpfilter/msgfmt.h b/net/bpfilter/msgfmt.h
new file mode 100644
index 000000000..98d121c62
--- /dev/null
+++ b/net/bpfilter/msgfmt.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NET_BPFILTER_MSGFMT_H
+#define _NET_BPFILTER_MSGFMT_H
+
+struct mbox_request {
+	__u64 addr;
+	__u32 len;
+	__u32 is_set;
+	__u32 cmd;
+	__u32 pid;
+};
+
+struct mbox_reply {
+	__u32 status;
+};
+
+#endif