v4.19.13 snapshot.
diff --git a/arch/um/drivers/pcap_user.c b/arch/um/drivers/pcap_user.c
new file mode 100644
index 0000000..c07b9c7
--- /dev/null
+++ b/arch/um/drivers/pcap_user.c
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL.
+ */
+
+#include <errno.h>
+#include <pcap.h>
+#include <string.h>
+#include <asm/types.h>
+#include <net_user.h>
+#include "pcap_user.h"
+#include <um_malloc.h>
+
+#define PCAP_FD(p) (*(int *)(p))
+
+static int 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, ETH_MAX_PACKET + ETH_HEADER_OTHER,
+ pri->promisc, 0, errors);
+ if (p == NULL) {
+ printk(UM_KERN_ERR "pcap_user_init : pcap_open_live failed - "
+ "'%s'\n", errors);
+ return -EINVAL;
+ }
+
+ pri->dev = dev;
+ pri->pcap = p;
+ return 0;
+}
+
+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(UM_KERN_ERR "pcap_open : dev_netmask failed\n");
+ return -EIO;
+ }
+
+ pri->compiled = uml_kmalloc(sizeof(struct bpf_program),
+ UM_GFP_KERNEL);
+ if (pri->compiled == NULL) {
+ printk(UM_KERN_ERR "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(UM_KERN_ERR "pcap_open : pcap_compile failed - "
+ "'%s'\n", pcap_geterr(pri->pcap));
+ goto out;
+ }
+
+ err = pcap_setfilter(pri->pcap, pri->compiled);
+ if (err < 0) {
+ printk(UM_KERN_ERR "pcap_open : pcap_setfilter "
+ "failed - '%s'\n", pcap_geterr(pri->pcap));
+ goto out;
+ }
+ }
+
+ return PCAP_FD(pri->pcap);
+
+ out:
+ kfree(pri->compiled);
+ return -EIO;
+}
+
+static void pcap_remove(void *data)
+{
+ struct pcap_data *pri = data;
+
+ if (pri->compiled != NULL)
+ pcap_freecode(pri->compiled);
+
+ if (pri->pcap != NULL)
+ 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(UM_KERN_ERR "pcap_dispatch failed - %s\n",
+ pcap_geterr(pri->pcap));
+ return -EIO;
+ }
+ else if (n == 0)
+ return 0;
+ return hdata.len;
+}
+
+const struct net_user_info pcap_user_info = {
+ .init = pcap_user_init,
+ .open = pcap_open,
+ .close = NULL,
+ .remove = pcap_remove,
+ .add_address = NULL,
+ .delete_address = NULL,
+ .mtu = ETH_MAX_PACKET,
+ .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
+};