1 files changed, 143 insertions, 0 deletions
diff --git a/arch/um/drivers/pcap_user.c b/arch/um/drivers/pcap_user.c
new file mode 100644
index 00000000000..edfcb29273e
--- /dev/null
+++ b/arch/um/drivers/pcap_user.c
@@ -0,0 +1,143 @@
+/*
+ * Copyright (C) 2002 Jeff Dike <jdike@karaya.com>
+ * Licensed under the GPL.
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <pcap.h>
+#include <asm/types.h>
+#include "net_user.h"
+#include "pcap_user.h"
+#include "user.h"
+
+#define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER)
+
+#define PCAP_FD(p) (*(int *)(p))
+
+static void pcap_user_init(void *data, void *dev)
+{
+	struct pcap_data *pri = data;
+	pcap_t *p;
+	char errors[PCAP_ERRBUF_SIZE];
+
+	p = pcap_open_live(pri->host_if, MAX_PACKET, pri->promisc, 0, errors);
+	if(p == NULL){
+		printk("pcap_user_init : pcap_open_live failed - '%s'\n", 
+		       errors);
+		return;
+	}
+
+	pri->dev = dev;
+	pri->pcap = p;
+}
+
+static int pcap_open(void *data)
+{
+	struct pcap_data *pri = data;
+	__u32 netmask;
+	int err;
+
+	if(pri->pcap == NULL)
+		return(-ENODEV);
+
+	if(pri->filter != NULL){
+		err = dev_netmask(pri->dev, &netmask);
+		if(err < 0){
+			printk("pcap_open : dev_netmask failed\n");
+			return(-EIO);
+		}
+
+		pri->compiled = um_kmalloc(sizeof(struct bpf_program));
+		if(pri->compiled == NULL){
+			printk("pcap_open : kmalloc failed\n");
+			return(-ENOMEM);
+		}
+		
+		err = pcap_compile(pri->pcap, 
+				   (struct bpf_program *) pri->compiled, 
+				   pri->filter, pri->optimize, netmask);
+		if(err < 0){
+			printk("pcap_open : pcap_compile failed - '%s'\n", 
+			       pcap_geterr(pri->pcap));
+			return(-EIO);
+		}
+
+		err = pcap_setfilter(pri->pcap, pri->compiled);
+		if(err < 0){
+			printk("pcap_open : pcap_setfilter failed - '%s'\n", 
+			       pcap_geterr(pri->pcap));
+			return(-EIO);
+		}
+	}
+	
+	return(PCAP_FD(pri->pcap));
+}
+
+static void pcap_remove(void *data)
+{
+	struct pcap_data *pri = data;
+
+	if(pri->compiled != NULL)
+		pcap_freecode(pri->compiled);
+
+	pcap_close(pri->pcap);
+}
+
+struct pcap_handler_data {
+	char *buffer;
+	int len;
+};
+
+static void handler(u_char *data, const struct pcap_pkthdr *header, 
+		    const u_char *packet)
+{
+	int len;
+
+	struct pcap_handler_data *hdata = (struct pcap_handler_data *) data;
+
+	len = hdata->len < header->caplen ? hdata->len : header->caplen;
+	memcpy(hdata->buffer, packet, len);
+	hdata->len = len;
+}
+
+int pcap_user_read(int fd, void *buffer, int len, struct pcap_data *pri)
+{
+	struct pcap_handler_data hdata = ((struct pcap_handler_data)
+		                          { .buffer  	= buffer,
+					    .len 	= len });
+	int n;
+
+	n = pcap_dispatch(pri->pcap, 1, handler, (u_char *) &hdata);
+	if(n < 0){
+		printk("pcap_dispatch failed - %s\n", pcap_geterr(pri->pcap));
+		return(-EIO);
+	}
+	else if(n == 0) 
+		return(0);
+	return(hdata.len);
+}
+
+struct net_user_info pcap_user_info = {
+	.init		= pcap_user_init,
+	.open		= pcap_open,
+	.close	 	= NULL,
+	.remove	 	= pcap_remove,
+	.set_mtu	= NULL,
+	.add_address	= NULL,
+	.delete_address = NULL,
+	.max_packet	= MAX_PACKET - ETH_HEADER_OTHER
+};
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */