File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/arch/um/drivers/slirp_kern.c b/arch/um/drivers/slirp_kern.c
new file mode 100644
index 0000000..4ef11ca
--- /dev/null
+++ b/arch/um/drivers/slirp_kern.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL.
+ */
+
+#include <linux/if_arp.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/string.h>
+#include <net_kern.h>
+#include <net_user.h>
+#include "slirp.h"
+
+struct slirp_init {
+ struct arg_list_dummy_wrapper argw; /* XXX should be simpler... */
+};
+
+void slirp_init(struct net_device *dev, void *data)
+{
+ struct uml_net_private *private;
+ struct slirp_data *spri;
+ struct slirp_init *init = data;
+ int i;
+
+ private = netdev_priv(dev);
+ spri = (struct slirp_data *) private->user;
+
+ spri->argw = init->argw;
+ spri->pid = -1;
+ spri->slave = -1;
+ spri->dev = dev;
+
+ slip_proto_init(&spri->slip);
+
+ dev->hard_header_len = 0;
+ dev->header_ops = NULL;
+ dev->addr_len = 0;
+ dev->type = ARPHRD_SLIP;
+ dev->tx_queue_len = 256;
+ dev->flags = IFF_NOARP;
+ printk("SLIRP backend - command line:");
+ for (i = 0; spri->argw.argv[i] != NULL; i++)
+ printk(" '%s'",spri->argw.argv[i]);
+ printk("\n");
+}
+
+static unsigned short slirp_protocol(struct sk_buff *skbuff)
+{
+ return htons(ETH_P_IP);
+}
+
+static int slirp_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return slirp_user_read(fd, skb_mac_header(skb), skb->dev->mtu,
+ (struct slirp_data *) &lp->user);
+}
+
+static int slirp_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+ return slirp_user_write(fd, skb->data, skb->len,
+ (struct slirp_data *) &lp->user);
+}
+
+const struct net_kern_info slirp_kern_info = {
+ .init = slirp_init,
+ .protocol = slirp_protocol,
+ .read = slirp_read,
+ .write = slirp_write,
+};
+
+static int slirp_setup(char *str, char **mac_out, void *data)
+{
+ struct slirp_init *init = data;
+ int i=0;
+
+ *init = ((struct slirp_init) { .argw = { { "slirp", NULL } } });
+
+ str = split_if_spec(str, mac_out, NULL);
+
+ if (str == NULL) /* no command line given after MAC addr */
+ return 1;
+
+ do {
+ if (i >= SLIRP_MAX_ARGS - 1) {
+ printk(KERN_WARNING "slirp_setup: truncating slirp "
+ "arguments\n");
+ break;
+ }
+ init->argw.argv[i++] = str;
+ while(*str && *str!=',') {
+ if (*str == '_')
+ *str=' ';
+ str++;
+ }
+ if (*str != ',')
+ break;
+ *str++ = '\0';
+ } while (1);
+
+ init->argw.argv[i] = NULL;
+ return 1;
+}
+
+static struct transport slirp_transport = {
+ .list = LIST_HEAD_INIT(slirp_transport.list),
+ .name = "slirp",
+ .setup = slirp_setup,
+ .user = &slirp_user_info,
+ .kern = &slirp_kern_info,
+ .private_size = sizeof(struct slirp_data),
+ .setup_size = sizeof(struct slirp_init),
+};
+
+static int register_slirp(void)
+{
+ register_transport(&slirp_transport);
+ return 0;
+}
+
+late_initcall(register_slirp);