1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
|
--- net/net.c.orig 2018-04-24 16:30:47 UTC
+++ net/net.c
@@ -52,6 +52,11 @@
#include "net/filter.h"
#include "qapi/string-output-visitor.h"
+#include <sys/ioctl.h>
+#ifdef __FreeBSD__
+#include <net/if.h>
+#endif
+
/* Net bridge is currently not supported for W32. */
#if !defined(_WIN32)
# define CONFIG_NET_BRIDGE
@@ -929,7 +934,225 @@ static int net_init_nic(const Netdev *netdev, const ch
return idx;
}
+#if defined(CONFIG_PCAP)
+#if defined(CONFIG_BPF)
+#define PCAP_DONT_INCLUDE_PCAP_BPF_H
+#include <net/bpf.h>
+#endif
+#include <pcap.h>
+struct PCAPState {
+ NetClientState nc;
+ pcap_t *handle;
+ int max_eth_frame_size;
+};
+
+static ssize_t pcap_receive(NetClientState *nc, const uint8_t *buf, size_t size)
+{
+ struct PCAPState *s = DO_UPCAST(struct PCAPState, nc, nc);
+
+ return pcap_inject(s->handle, (u_char*)buf, size);
+}
+
+static void pcap_callback(u_char *user, struct pcap_pkthdr *phdr, u_char *pdata
+ )
+{
+ NetClientState *nc = (NetClientState *)user;
+
+ int len = phdr->len;
+#ifdef __FreeBSD__
+ struct PCAPState *s = DO_UPCAST(struct PCAPState, nc, nc);
+ int max_eth_frame_size = s->max_eth_frame_size;
+
+ if (len > max_eth_frame_size) {
+ fprintf(stderr,
+ "pcap_send: packet size > %d (%d), truncating\n",
+ max_eth_frame_size, len);
+ len = max_eth_frame_size;
+ }
+#endif
+ qemu_send_packet(nc, pdata, len);
+}
+
+static void pcap_send(void *opaque)
+{
+ struct PCAPState *s = (struct PCAPState *)opaque;
+
+ for (;;) {
+ if (pcap_dispatch(s->handle, 0, (pcap_handler)&pcap_callback, (u_char *)&s->nc) >= 0)
+ break;
+ }
+}
+
+static void pcap_cleanup(NetClientState *nc)
+{
+ struct PCAPState *s = DO_UPCAST(struct PCAPState, nc, nc);
+
+ qemu_purge_queued_packets(nc);
+ pcap_close(s->handle);
+}
+
+static NetClientInfo net_pcap_info = {
+ .type = NET_CLIENT_DRIVER_PCAP,
+ .size = sizeof(struct PCAPState),
+ .receive = pcap_receive,
+// .receive_raw = pcap_receive_raw,
+// .receive_iov = pcap_receive_iov,
+// .poll = pcap_poll,
+ .cleanup = pcap_cleanup,
+};
+/*
+ * ... -net pcap,ifname="..."
+ */
+
+int net_init_pcap(const Netdev *netdev,
+ const char *name, NetClientState *peer, Error **errp)
+{
+ const NetdevPcapOptions *pcap_opts;
+ NetClientState *nc;
+ struct PCAPState *s;
+ const char *ifname;
+ char errbuf[PCAP_ERRBUF_SIZE];
+#if defined(_WIN32)
+ HANDLE h;
+#endif
+ int i;
+
+ assert(netdev->type == NET_CLIENT_DRIVER_PCAP);
+ pcap_opts = &netdev->u.pcap;
+ if (!pcap_opts->has_ifname)
+ return -1;
+
+ ifname = pcap_opts->ifname;
+
+ /* create the object */
+ nc = qemu_new_net_client(&net_pcap_info, peer, "pcap", ifname);
+ s = DO_UPCAST(struct PCAPState, nc, nc);
+
+ if (ifname == NULL && (ifname = pcap_lookupdev(errbuf)) == NULL) {
+ fprintf(stderr, "qemu: pcap_create: %s\n", errbuf);
+ goto fail;
+ }
+
+#ifdef __FreeBSD__
+ /*
+ * We want to avoid passing oversize packets to the guest, which
+ * at least on FreeBSD can happen if the host interface uses tso
+ * (seen with an em(4) in this case) - so find out the host
+ * interface's mtu and assume the guest is configured the same.
+ */
+ s->max_eth_frame_size = 1514;
+ i = socket(AF_INET, SOCK_DGRAM, 0);
+ if (i >= 0) {
+ struct ifreq ifr;
+
+ (void) memset(&ifr, 0, sizeof(ifr));
+ strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+ if (ioctl(i, SIOCGIFMTU, &ifr) != -1)
+ s->max_eth_frame_size = ifr.ifr_mtu + 14;
+ close(i);
+ }
+#endif
+
+#if defined(CONFIG_PCAP_CREATE) || defined(_WIN32)
+ /*
+ * Create pcap handle for the device, set promiscuous mode and activate.
+ */
+ s->handle = (void *)pcap_create(ifname, errbuf);
+ if (!s->handle) {
+ fprintf(stderr, "qemu: pcap_create: %s\n", errbuf);
+ goto fail;
+ }
+ if (pcap_set_promisc(s->handle, 1) != 0) {
+ pcap_perror(s->handle, (char *)"qemu: pcap_set_promisc:");
+ goto fail;
+ }
+ if (pcap_activate(s->handle) != 0) {
+ pcap_perror(s->handle, (char *)"qemu: pcap_activate:");
+ goto fail;
+ }
+#else
+ /* Attempt to connect device. */
+ s->handle = (void *)pcap_open_live(ifname, 65535, 1, 0, errbuf);
+ if (!s->handle) {
+ fprintf(stderr, "qemu: pcap_open_live: %s\n", errbuf);
+ goto fail;
+ }
+#endif
+
+ /* Set non-blocking mode. */
+ if (pcap_setnonblock(s->handle, 1, errbuf) < 0) {
+ fprintf(stderr, "qemu: pcap_setnonblock: %s\n", errbuf);
+ goto fail;
+ }
+
+#if defined(_WIN32)
+ /*
+ * Tell the kernel that the packet has to be seen immediately.
+ */
+ if (pcap_setmintocopy(s->handle, 0) < 0) {
+ fprintf(stderr, "qemu: pcap failed to set immediate mode\n");
+ goto fail;
+ }
+#else /* !_WIN32 */
+#if defined(CONFIG_BPF)
+#if defined(BIOCIMMEDIATE)
+ /*
+ * Tell the kernel that the packet has to be seen immediately.
+ */
+ {
+ unsigned int one = 1;
+ if (ioctl(pcap_fileno(s->handle), BIOCIMMEDIATE, &one) < 0) {
+ fprintf(stderr, "qemu: pcap failed to set immediate mode\n");
+ goto fail;
+ }
+ }
+#endif /* BIOCIMMEDIATE */
+#if defined(BIOCFEEDBACK)
+ /*
+ * Tell the kernel that the sent packet has to be fed back.
+ * This is necessary to connect host and guest.
+ */
+ {
+ unsigned int one = 1;
+ if (ioctl(pcap_fileno(s->handle), BIOCFEEDBACK, &one) < 0) {
+ fprintf(stderr, "qemu: pcap failed to set feedback mode\n");
+ goto fail;
+ }
+ }
+#endif /* BIOCFEEDBACK */
+#endif /* CONFIG_BPF */
+#endif /* _WIN32 */
+
+ snprintf(s->nc.info_str, sizeof(s->nc.info_str), "pcap redirector");
+
+#if defined(_WIN32)
+ if ((h = pcap_getevent(s->handle)) == NULL) {
+ fprintf(stderr, "qemu: pcap_getevent failed\n");
+ goto fail;
+ }
+ qemu_add_wait_object(h, pcap_send, s);
+#else /* !_WIN32 */
+ if ((i = pcap_get_selectable_fd(s->handle)) < 0) {
+ fprintf(stderr, "qemu: pcap_get_selectable_fd failed\n");
+ goto fail;
+ }
+ qemu_set_fd_handler(i, pcap_send, NULL, s);
+#endif /* _WIN32 */
+
+ return 0;
+
+fail:
+ if (s) {
+ if (s->handle)
+ pcap_close(s->handle);
+ }
+
+ return -1;
+}
+
+#endif
+
static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
const Netdev *netdev,
const char *name,
@@ -955,6 +1178,9 @@ static int (* const net_client_init_fun[NET_CLIENT_DRI
#endif
#ifdef CONFIG_L2TPV3
[NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3,
+#endif
+#ifdef CONFIG_PCAP
+ [NET_CLIENT_DRIVER_PCAP] = net_init_pcap,
#endif
};
|
