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arch/um/drivers/pcap_user.c
2.91 KB
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/* |
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* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
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* Licensed under the GPL. */ |
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#include <errno.h> #include <pcap.h> |
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#include <string.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 <um_malloc.h> |
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|
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#define PCAP_FD(p) (*(int *)(p)) |
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static int pcap_user_init(void *data, void *dev) |
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{ struct pcap_data *pri = data; pcap_t *p; char errors[PCAP_ERRBUF_SIZE]; |
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p = pcap_open_live(pri->host_if, ETH_MAX_PACKET + ETH_HEADER_OTHER, pri->promisc, 0, errors); |
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if (p == NULL) { |
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printk(UM_KERN_ERR "pcap_user_init : pcap_open_live failed - " "'%s' ", errors); |
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return -EINVAL; |
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} pri->dev = dev; pri->pcap = p; |
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return 0; |
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} static int pcap_open(void *data) { struct pcap_data *pri = data; __u32 netmask; int err; |
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if (pri->pcap == NULL) |
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return -ENODEV; |
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|
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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(UM_KERN_ERR "pcap_open : dev_netmask failed "); |
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return -EIO; |
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} |
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pri->compiled = uml_kmalloc(sizeof(struct bpf_program), |
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UM_GFP_KERNEL); if (pri->compiled == NULL) { |
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printk(UM_KERN_ERR "pcap_open : kmalloc failed "); |
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return -ENOMEM; |
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} |
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|
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err = pcap_compile(pri->pcap, (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(UM_KERN_ERR "pcap_open : pcap_compile failed - " "'%s' ", pcap_geterr(pri->pcap)); |
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goto out; |
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} err = pcap_setfilter(pri->pcap, pri->compiled); |
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if (err < 0) { |
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printk(UM_KERN_ERR "pcap_open : pcap_setfilter " "failed - '%s' ", pcap_geterr(pri->pcap)); |
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goto out; |
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} } |
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return PCAP_FD(pri->pcap); |
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out: kfree(pri->compiled); return -EIO; |
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} static void pcap_remove(void *data) { 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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if (pri->pcap != NULL) |
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pcap_close(pri->pcap); |
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} struct pcap_handler_data { char *buffer; int len; }; |
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static void handler(u_char *data, const struct pcap_pkthdr *header, |
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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); |
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if (n < 0) { |
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printk(UM_KERN_ERR "pcap_dispatch failed - %s ", 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; return hdata.len; |
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} |
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const struct net_user_info pcap_user_info = { |
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.init = pcap_user_init, .open = pcap_open, .close = NULL, .remove = pcap_remove, |
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.add_address = NULL, .delete_address = NULL, |
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.mtu = ETH_MAX_PACKET, .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER, |
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}; |