v4.19.13 snapshot.
diff --git a/arch/um/drivers/pcap_kern.c b/arch/um/drivers/pcap_kern.c
new file mode 100644
index 0000000..be0fb57
--- /dev/null
+++ b/arch/um/drivers/pcap_kern.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL.
+ */
+
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <net_kern.h>
+#include "pcap_user.h"
+
+struct pcap_init {
+ char *host_if;
+ int promisc;
+ int optimize;
+ char *filter;
+};
+
+void pcap_init(struct net_device *dev, void *data)
+{
+ struct uml_net_private *pri;
+ struct pcap_data *ppri;
+ struct pcap_init *init = data;
+
+ pri = netdev_priv(dev);
+ ppri = (struct pcap_data *) pri->user;
+ ppri->host_if = init->host_if;
+ ppri->promisc = init->promisc;
+ ppri->optimize = init->optimize;
+ ppri->filter = init->filter;
+
+ printk("pcap backend, host interface %s\n", ppri->host_if);
+}
+
+static int pcap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return pcap_user_read(fd, skb_mac_header(skb),
+ skb->dev->mtu + ETH_HEADER_OTHER,
+ (struct pcap_data *) &lp->user);
+}
+
+static int pcap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return -EPERM;
+}
+
+static const struct net_kern_info pcap_kern_info = {
+ .init = pcap_init,
+ .protocol = eth_protocol,
+ .read = pcap_read,
+ .write = pcap_write,
+};
+
+int pcap_setup(char *str, char **mac_out, void *data)
+{
+ struct pcap_init *init = data;
+ char *remain, *host_if = NULL, *options[2] = { NULL, NULL };
+ int i;
+
+ *init = ((struct pcap_init)
+ { .host_if = "eth0",
+ .promisc = 1,
+ .optimize = 0,
+ .filter = NULL });
+
+ remain = split_if_spec(str, &host_if, &init->filter,
+ &options[0], &options[1], mac_out, NULL);
+ if (remain != NULL) {
+ printk(KERN_ERR "pcap_setup - Extra garbage on "
+ "specification : '%s'\n", remain);
+ return 0;
+ }
+
+ if (host_if != NULL)
+ init->host_if = host_if;
+
+ for (i = 0; i < ARRAY_SIZE(options); i++) {
+ if (options[i] == NULL)
+ continue;
+ if (!strcmp(options[i], "promisc"))
+ init->promisc = 1;
+ else if (!strcmp(options[i], "nopromisc"))
+ init->promisc = 0;
+ else if (!strcmp(options[i], "optimize"))
+ init->optimize = 1;
+ else if (!strcmp(options[i], "nooptimize"))
+ init->optimize = 0;
+ else {
+ printk(KERN_ERR "pcap_setup : bad option - '%s'\n",
+ options[i]);
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+static struct transport pcap_transport = {
+ .list = LIST_HEAD_INIT(pcap_transport.list),
+ .name = "pcap",
+ .setup = pcap_setup,
+ .user = &pcap_user_info,
+ .kern = &pcap_kern_info,
+ .private_size = sizeof(struct pcap_data),
+ .setup_size = sizeof(struct pcap_init),
+};
+
+static int register_pcap(void)
+{
+ register_transport(&pcap_transport);
+ return 0;
+}
+
+late_initcall(register_pcap);