Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 128 insertions, 0 deletions

diff --git a/drivers/staging/gdm724x/netlink_k.c b/drivers/staging/gdm724x/netlink_k.c
new file mode 100644
index 000000000..8f39cc561
--- /dev/null
+++ b/drivers/staging/gdm724x/netlink_k.c
@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved. */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/export.h>
+#include <linux/mutex.h>
+#include <linux/etherdevice.h>
+#include <linux/netlink.h>
+#include <asm/byteorder.h>
+#include <net/sock.h>
+
+#include "netlink_k.h"
+
+static DEFINE_MUTEX(netlink_mutex);
+
+#define ND_MAX_GROUP		30
+#define ND_IFINDEX_LEN		sizeof(int)
+#define ND_NLMSG_SPACE(len)	(NLMSG_SPACE(len) + ND_IFINDEX_LEN)
+#define ND_NLMSG_DATA(nlh)	((void *)((char *)NLMSG_DATA(nlh) + \
+						  ND_IFINDEX_LEN))
+#define ND_NLMSG_S_LEN(len)	((len) + ND_IFINDEX_LEN)
+#define ND_NLMSG_R_LEN(nlh)	((nlh)->nlmsg_len - ND_IFINDEX_LEN)
+#define ND_NLMSG_IFIDX(nlh)	NLMSG_DATA(nlh)
+#define ND_MAX_MSG_LEN		(1024 * 32)
+
+static void (*rcv_cb)(struct net_device *dev, u16 type, void *msg, int len);
+
+static void netlink_rcv_cb(struct sk_buff *skb)
+{
+	struct nlmsghdr	*nlh;
+	struct net_device *dev;
+	u32 mlen;
+	void *msg;
+	int ifindex;
+
+	if (!rcv_cb) {
+		pr_err("nl cb - unregistered\n");
+		return;
+	}
+
+	if (skb->len < NLMSG_HDRLEN) {
+		pr_err("nl cb - invalid skb length\n");
+		return;
+	}
+
+	nlh = (struct nlmsghdr *)skb->data;
+
+	if (skb->len < nlh->nlmsg_len || nlh->nlmsg_len > ND_MAX_MSG_LEN) {
+		pr_err("nl cb - invalid length (%d,%d)\n",
+		       skb->len, nlh->nlmsg_len);
+		return;
+	}
+
+	memcpy(&ifindex, ND_NLMSG_IFIDX(nlh), ND_IFINDEX_LEN);
+	msg = ND_NLMSG_DATA(nlh);
+	mlen = ND_NLMSG_R_LEN(nlh);
+
+	dev = dev_get_by_index(&init_net, ifindex);
+	if (dev) {
+		rcv_cb(dev, nlh->nlmsg_type, msg, mlen);
+		dev_put(dev);
+	} else {
+		pr_err("nl cb - dev (%d) not found\n", ifindex);
+	}
+}
+
+static void netlink_rcv(struct sk_buff *skb)
+{
+	mutex_lock(&netlink_mutex);
+	netlink_rcv_cb(skb);
+	mutex_unlock(&netlink_mutex);
+}
+
+struct sock *netlink_init(int unit,
+			  void (*cb)(struct net_device *dev, u16 type,
+				     void *msg, int len))
+{
+	struct sock *sock;
+	struct netlink_kernel_cfg cfg = {
+		.input  = netlink_rcv,
+	};
+
+	sock = netlink_kernel_create(&init_net, unit, &cfg);
+
+	if (sock)
+		rcv_cb = cb;
+
+	return sock;
+}
+
+int netlink_send(struct sock *sock, int group, u16 type, void *msg, int len,
+		 struct net_device *dev)
+{
+	static u32 seq;
+	struct sk_buff *skb = NULL;
+	struct nlmsghdr *nlh;
+	int ret = 0;
+
+	if (group > ND_MAX_GROUP)
+		return -EINVAL;
+
+	if (!netlink_has_listeners(sock, group + 1))
+		return -ESRCH;
+
+	skb = alloc_skb(NLMSG_SPACE(len), GFP_ATOMIC);
+	if (!skb)
+		return -ENOMEM;
+
+	seq++;
+
+	nlh = nlmsg_put(skb, 0, seq, type, len, 0);
+	memcpy(NLMSG_DATA(nlh), msg, len);
+	NETLINK_CB(skb).portid = 0;
+	NETLINK_CB(skb).dst_group = 0;
+
+	ret = netlink_broadcast(sock, skb, 0, group + 1, GFP_ATOMIC);
+	if (!ret)
+		return len;
+
+	if (ret != -ESRCH)
+		netdev_err(dev, "nl broadcast g=%d, t=%d, l=%d, r=%d\n",
+			   group, type, len, ret);
+	else if (netlink_has_listeners(sock, group + 1))
+		return -EAGAIN;
+
+	return ret;
+}