1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
11 #include "pcap_user.h"
12 #include <um_malloc.h>
14 #define PCAP_FD(p) (*(int *)(p))
16 static int pcap_user_init(void *data, void *dev)
18 struct pcap_data *pri = data;
20 char errors[PCAP_ERRBUF_SIZE];
22 p = pcap_open_live(pri->host_if, ETH_MAX_PACKET + ETH_HEADER_OTHER,
23 pri->promisc, 0, errors);
25 printk(UM_KERN_ERR "pcap_user_init : pcap_open_live failed - "
35 static int pcap_open(void *data)
37 struct pcap_data *pri = data;
41 if (pri->pcap == NULL)
44 if (pri->filter != NULL) {
45 err = dev_netmask(pri->dev, &netmask);
47 printk(UM_KERN_ERR "pcap_open : dev_netmask failed\n");
51 pri->compiled = uml_kmalloc(sizeof(struct bpf_program),
53 if (pri->compiled == NULL) {
54 printk(UM_KERN_ERR "pcap_open : kmalloc failed\n");
58 err = pcap_compile(pri->pcap,
59 (struct bpf_program *) pri->compiled,
60 pri->filter, pri->optimize, netmask);
62 printk(UM_KERN_ERR "pcap_open : pcap_compile failed - "
63 "'%s'\n", pcap_geterr(pri->pcap));
67 err = pcap_setfilter(pri->pcap, pri->compiled);
69 printk(UM_KERN_ERR "pcap_open : pcap_setfilter "
70 "failed - '%s'\n", pcap_geterr(pri->pcap));
75 return PCAP_FD(pri->pcap);
82 static void pcap_remove(void *data)
84 struct pcap_data *pri = data;
86 if (pri->compiled != NULL)
87 pcap_freecode(pri->compiled);
89 if (pri->pcap != NULL)
90 pcap_close(pri->pcap);
93 struct pcap_handler_data {
98 static void handler(u_char *data, const struct pcap_pkthdr *header,
103 struct pcap_handler_data *hdata = (struct pcap_handler_data *) data;
105 len = hdata->len < header->caplen ? hdata->len : header->caplen;
106 memcpy(hdata->buffer, packet, len);
110 int pcap_user_read(int fd, void *buffer, int len, struct pcap_data *pri)
112 struct pcap_handler_data hdata = ((struct pcap_handler_data)
117 n = pcap_dispatch(pri->pcap, 1, handler, (u_char *) &hdata);
119 printk(UM_KERN_ERR "pcap_dispatch failed - %s\n",
120 pcap_geterr(pri->pcap));
128 const struct net_user_info pcap_user_info = {
129 .init = pcap_user_init,
132 .remove = pcap_remove,
134 .delete_address = NULL,
135 .mtu = ETH_MAX_PACKET,
136 .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,