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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4 */
5
6#include <errno.h>
7#include <pcap.h>
8#include <string.h>
9#include <asm/types.h>
10#include <net_user.h>
11#include "pcap_user.h"
12#include <um_malloc.h>
13
14#define PCAP_FD(p) (*(int *)(p))
15
16static int pcap_user_init(void *data, void *dev)
17{
18 struct pcap_data *pri = data;
19 pcap_t *p;
20 char errors[PCAP_ERRBUF_SIZE];
21
22 p = pcap_open_live(pri->host_if, ETH_MAX_PACKET + ETH_HEADER_OTHER,
23 pri->promisc, 0, errors);
24 if (p == NULL) {
25 printk(UM_KERN_ERR "pcap_user_init : pcap_open_live failed - "
26 "'%s'\n", errors);
27 return -EINVAL;
28 }
29
30 pri->dev = dev;
31 pri->pcap = p;
32 return 0;
33}
34
35static int pcap_user_open(void *data)
36{
37 struct pcap_data *pri = data;
38 __u32 netmask;
39 int err;
40
41 if (pri->pcap == NULL)
42 return -ENODEV;
43
44 if (pri->filter != NULL) {
45 err = dev_netmask(pri->dev, &netmask);
46 if (err < 0) {
47 printk(UM_KERN_ERR "pcap_user_open : dev_netmask failed\n");
48 return -EIO;
49 }
50
51 pri->compiled = uml_kmalloc(sizeof(struct bpf_program),
52 UM_GFP_KERNEL);
53 if (pri->compiled == NULL) {
54 printk(UM_KERN_ERR "pcap_user_open : kmalloc failed\n");
55 return -ENOMEM;
56 }
57
58 err = pcap_compile(pri->pcap,
59 (struct bpf_program *) pri->compiled,
60 pri->filter, pri->optimize, netmask);
61 if (err < 0) {
62 printk(UM_KERN_ERR "pcap_user_open : pcap_compile failed - "
63 "'%s'\n", pcap_geterr(pri->pcap));
64 goto out;
65 }
66
67 err = pcap_setfilter(pri->pcap, pri->compiled);
68 if (err < 0) {
69 printk(UM_KERN_ERR "pcap_user_open : pcap_setfilter "
70 "failed - '%s'\n", pcap_geterr(pri->pcap));
71 goto out;
72 }
73 }
74
75 return PCAP_FD(pri->pcap);
76
77 out:
78 kfree(pri->compiled);
79 return -EIO;
80}
81
82static void pcap_remove(void *data)
83{
84 struct pcap_data *pri = data;
85
86 if (pri->compiled != NULL)
87 pcap_freecode(pri->compiled);
88
89 if (pri->pcap != NULL)
90 pcap_close(pri->pcap);
91}
92
93struct pcap_handler_data {
94 char *buffer;
95 int len;
96};
97
98static void handler(u_char *data, const struct pcap_pkthdr *header,
99 const u_char *packet)
100{
101 int len;
102
103 struct pcap_handler_data *hdata = (struct pcap_handler_data *) data;
104
105 len = hdata->len < header->caplen ? hdata->len : header->caplen;
106 memcpy(hdata->buffer, packet, len);
107 hdata->len = len;
108}
109
110int pcap_user_read(int fd, void *buffer, int len, struct pcap_data *pri)
111{
112 struct pcap_handler_data hdata = ((struct pcap_handler_data)
113 { .buffer = buffer,
114 .len = len });
115 int n;
116
117 n = pcap_dispatch(pri->pcap, 1, handler, (u_char *) &hdata);
118 if (n < 0) {
119 printk(UM_KERN_ERR "pcap_dispatch failed - %s\n",
120 pcap_geterr(pri->pcap));
121 return -EIO;
122 }
123 else if (n == 0)
124 return 0;
125 return hdata.len;
126}
127
128const struct net_user_info pcap_user_info = {
129 .init = pcap_user_init,
130 .open = pcap_user_open,
131 .close = NULL,
132 .remove = pcap_remove,
133 .add_address = NULL,
134 .delete_address = NULL,
135 .mtu = ETH_MAX_PACKET,
136 .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
137};
1/*
2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL.
4 */
5
6#include <errno.h>
7#include <pcap.h>
8#include <string.h>
9#include <asm/types.h>
10#include <net_user.h>
11#include "pcap_user.h"
12#include <um_malloc.h>
13
14#define PCAP_FD(p) (*(int *)(p))
15
16static int pcap_user_init(void *data, void *dev)
17{
18 struct pcap_data *pri = data;
19 pcap_t *p;
20 char errors[PCAP_ERRBUF_SIZE];
21
22 p = pcap_open_live(pri->host_if, ETH_MAX_PACKET + ETH_HEADER_OTHER,
23 pri->promisc, 0, errors);
24 if (p == NULL) {
25 printk(UM_KERN_ERR "pcap_user_init : pcap_open_live failed - "
26 "'%s'\n", errors);
27 return -EINVAL;
28 }
29
30 pri->dev = dev;
31 pri->pcap = p;
32 return 0;
33}
34
35static int pcap_open(void *data)
36{
37 struct pcap_data *pri = data;
38 __u32 netmask;
39 int err;
40
41 if (pri->pcap == NULL)
42 return -ENODEV;
43
44 if (pri->filter != NULL) {
45 err = dev_netmask(pri->dev, &netmask);
46 if (err < 0) {
47 printk(UM_KERN_ERR "pcap_open : dev_netmask failed\n");
48 return -EIO;
49 }
50
51 pri->compiled = uml_kmalloc(sizeof(struct bpf_program),
52 UM_GFP_KERNEL);
53 if (pri->compiled == NULL) {
54 printk(UM_KERN_ERR "pcap_open : kmalloc failed\n");
55 return -ENOMEM;
56 }
57
58 err = pcap_compile(pri->pcap,
59 (struct bpf_program *) pri->compiled,
60 pri->filter, pri->optimize, netmask);
61 if (err < 0) {
62 printk(UM_KERN_ERR "pcap_open : pcap_compile failed - "
63 "'%s'\n", pcap_geterr(pri->pcap));
64 goto out;
65 }
66
67 err = pcap_setfilter(pri->pcap, pri->compiled);
68 if (err < 0) {
69 printk(UM_KERN_ERR "pcap_open : pcap_setfilter "
70 "failed - '%s'\n", pcap_geterr(pri->pcap));
71 goto out;
72 }
73 }
74
75 return PCAP_FD(pri->pcap);
76
77 out:
78 kfree(pri->compiled);
79 return -EIO;
80}
81
82static void pcap_remove(void *data)
83{
84 struct pcap_data *pri = data;
85
86 if (pri->compiled != NULL)
87 pcap_freecode(pri->compiled);
88
89 if (pri->pcap != NULL)
90 pcap_close(pri->pcap);
91}
92
93struct pcap_handler_data {
94 char *buffer;
95 int len;
96};
97
98static void handler(u_char *data, const struct pcap_pkthdr *header,
99 const u_char *packet)
100{
101 int len;
102
103 struct pcap_handler_data *hdata = (struct pcap_handler_data *) data;
104
105 len = hdata->len < header->caplen ? hdata->len : header->caplen;
106 memcpy(hdata->buffer, packet, len);
107 hdata->len = len;
108}
109
110int pcap_user_read(int fd, void *buffer, int len, struct pcap_data *pri)
111{
112 struct pcap_handler_data hdata = ((struct pcap_handler_data)
113 { .buffer = buffer,
114 .len = len });
115 int n;
116
117 n = pcap_dispatch(pri->pcap, 1, handler, (u_char *) &hdata);
118 if (n < 0) {
119 printk(UM_KERN_ERR "pcap_dispatch failed - %s\n",
120 pcap_geterr(pri->pcap));
121 return -EIO;
122 }
123 else if (n == 0)
124 return 0;
125 return hdata.len;
126}
127
128const struct net_user_info pcap_user_info = {
129 .init = pcap_user_init,
130 .open = pcap_open,
131 .close = NULL,
132 .remove = pcap_remove,
133 .add_address = NULL,
134 .delete_address = NULL,
135 .mtu = ETH_MAX_PACKET,
136 .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
137};