1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 4 */ 5 6 #include <linux/init.h> 7 #include <linux/netdevice.h> 8 #include <net_kern.h> 9 #include "pcap_user.h" 10 11 struct pcap_init { 12 char *host_if; 13 int promisc; 14 int optimize; 15 char *filter; 16 }; 17 18 void pcap_init(struct net_device *dev, void *data) 19 { 20 struct uml_net_private *pri; 21 struct pcap_data *ppri; 22 struct pcap_init *init = data; 23 24 pri = netdev_priv(dev); 25 ppri = (struct pcap_data *) pri->user; 26 ppri->host_if = init->host_if; 27 ppri->promisc = init->promisc; 28 ppri->optimize = init->optimize; 29 ppri->filter = init->filter; 30 31 printk("pcap backend, host interface %s\n", ppri->host_if); 32 } 33 34 static int pcap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp) 35 { 36 return pcap_user_read(fd, skb_mac_header(skb), 37 skb->dev->mtu + ETH_HEADER_OTHER, 38 (struct pcap_data *) &lp->user); 39 } 40 41 static int pcap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp) 42 { 43 return -EPERM; 44 } 45 46 static const struct net_kern_info pcap_kern_info = { 47 .init = pcap_init, 48 .protocol = eth_protocol, 49 .read = pcap_read, 50 .write = pcap_write, 51 }; 52 53 int pcap_setup(char *str, char **mac_out, void *data) 54 { 55 struct pcap_init *init = data; 56 char *remain, *host_if = NULL, *options[2] = { NULL, NULL }; 57 int i; 58 59 *init = ((struct pcap_init) 60 { .host_if = "eth0", 61 .promisc = 1, 62 .optimize = 0, 63 .filter = NULL }); 64 65 remain = split_if_spec(str, &host_if, &init->filter, 66 &options[0], &options[1], mac_out, NULL); 67 if (remain != NULL) { 68 printk(KERN_ERR "pcap_setup - Extra garbage on " 69 "specification : '%s'\n", remain); 70 return 0; 71 } 72 73 if (host_if != NULL) 74 init->host_if = host_if; 75 76 for (i = 0; i < ARRAY_SIZE(options); i++) { 77 if (options[i] == NULL) 78 continue; 79 if (!strcmp(options[i], "promisc")) 80 init->promisc = 1; 81 else if (!strcmp(options[i], "nopromisc")) 82 init->promisc = 0; 83 else if (!strcmp(options[i], "optimize")) 84 init->optimize = 1; 85 else if (!strcmp(options[i], "nooptimize")) 86 init->optimize = 0; 87 else { 88 printk(KERN_ERR "pcap_setup : bad option - '%s'\n", 89 options[i]); 90 return 0; 91 } 92 } 93 94 return 1; 95 } 96 97 static struct transport pcap_transport = { 98 .list = LIST_HEAD_INIT(pcap_transport.list), 99 .name = "pcap", 100 .setup = pcap_setup, 101 .user = &pcap_user_info, 102 .kern = &pcap_kern_info, 103 .private_size = sizeof(struct pcap_data), 104 .setup_size = sizeof(struct pcap_init), 105 }; 106 107 static int register_pcap(void) 108 { 109 register_transport(&pcap_transport); 110 return 0; 111 } 112 113 late_initcall(register_pcap); 114