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