jcs.org
qemu with hax to log dma reads & writes
jcs.org/2018/11/12/vfio
1/*
2 * QEMU System Emulator
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25#include "qemu/osdep.h"
26#include "qemu-common.h"
27#include "clients.h"
28#include "qapi/error.h"
29#include "qemu/error-report.h"
30#include "qemu/iov.h"
31#include "qemu/log.h"
32#include "qemu/module.h"
33#include "qemu/timer.h"
34#include "qapi/visitor.h"
35#include "net/filter.h"
36
37typedef struct DumpState {
38 int64_t start_ts;
39 int fd;
40 int pcap_caplen;
41} DumpState;
42
43#define PCAP_MAGIC 0xa1b2c3d4
44
45struct pcap_file_hdr {
46 uint32_t magic;
47 uint16_t version_major;
48 uint16_t version_minor;
49 int32_t thiszone;
50 uint32_t sigfigs;
51 uint32_t snaplen;
52 uint32_t linktype;
53};
54
55struct pcap_sf_pkthdr {
56 struct {
57 int32_t tv_sec;
58 int32_t tv_usec;
59 } ts;
60 uint32_t caplen;
61 uint32_t len;
62};
63
64static ssize_t dump_receive_iov(DumpState *s, const struct iovec *iov, int cnt)
65{
66 struct pcap_sf_pkthdr hdr;
67 int64_t ts;
68 int caplen;
69 size_t size = iov_size(iov, cnt);
70 struct iovec dumpiov[cnt + 1];
71
72 /* Early return in case of previous error. */
73 if (s->fd < 0) {
74 return size;
75 }
76
77 ts = qemu_clock_get_us(QEMU_CLOCK_VIRTUAL);
78 caplen = size > s->pcap_caplen ? s->pcap_caplen : size;
79
80 hdr.ts.tv_sec = ts / 1000000 + s->start_ts;
81 hdr.ts.tv_usec = ts % 1000000;
82 hdr.caplen = caplen;
83 hdr.len = size;
84
85 dumpiov[0].iov_base = &hdr;
86 dumpiov[0].iov_len = sizeof(hdr);
87 cnt = iov_copy(&dumpiov[1], cnt, iov, cnt, 0, caplen);
88
89 if (writev(s->fd, dumpiov, cnt + 1) != sizeof(hdr) + caplen) {
90 error_report("network dump write error - stopping dump");
91 close(s->fd);
92 s->fd = -1;
93 }
94
95 return size;
96}
97
98static void dump_cleanup(DumpState *s)
99{
100 close(s->fd);
101 s->fd = -1;
102}
103
104static int net_dump_state_init(DumpState *s, const char *filename,
105 int len, Error **errp)
106{
107 struct pcap_file_hdr hdr;
108 struct tm tm;
109 int fd;
110
111 fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY | O_BINARY, 0644);
112 if (fd < 0) {
113 error_setg_errno(errp, errno, "net dump: can't open %s", filename);
114 return -1;
115 }
116
117 hdr.magic = PCAP_MAGIC;
118 hdr.version_major = 2;
119 hdr.version_minor = 4;
120 hdr.thiszone = 0;
121 hdr.sigfigs = 0;
122 hdr.snaplen = len;
123 hdr.linktype = 1;
124
125 if (write(fd, &hdr, sizeof(hdr)) < sizeof(hdr)) {
126 error_setg_errno(errp, errno, "net dump write error");
127 close(fd);
128 return -1;
129 }
130
131 s->fd = fd;
132 s->pcap_caplen = len;
133
134 qemu_get_timedate(&tm, 0);
135 s->start_ts = mktime(&tm);
136
137 return 0;
138}
139
140#define TYPE_FILTER_DUMP "filter-dump"
141
142#define FILTER_DUMP(obj) \
143 OBJECT_CHECK(NetFilterDumpState, (obj), TYPE_FILTER_DUMP)
144
145struct NetFilterDumpState {
146 NetFilterState nfs;
147 DumpState ds;
148 char *filename;
149 uint32_t maxlen;
150};
151typedef struct NetFilterDumpState NetFilterDumpState;
152
153static ssize_t filter_dump_receive_iov(NetFilterState *nf, NetClientState *sndr,
154 unsigned flags, const struct iovec *iov,
155 int iovcnt, NetPacketSent *sent_cb)
156{
157 NetFilterDumpState *nfds = FILTER_DUMP(nf);
158
159 dump_receive_iov(&nfds->ds, iov, iovcnt);
160 return 0;
161}
162
163static void filter_dump_cleanup(NetFilterState *nf)
164{
165 NetFilterDumpState *nfds = FILTER_DUMP(nf);
166
167 dump_cleanup(&nfds->ds);
168}
169
170static void filter_dump_setup(NetFilterState *nf, Error **errp)
171{
172 NetFilterDumpState *nfds = FILTER_DUMP(nf);
173
174 if (!nfds->filename) {
175 error_setg(errp, "dump filter needs 'file' property set!");
176 return;
177 }
178
179 net_dump_state_init(&nfds->ds, nfds->filename, nfds->maxlen, errp);
180}
181
182static void filter_dump_get_maxlen(Object *obj, Visitor *v, const char *name,
183 void *opaque, Error **errp)
184{
185 NetFilterDumpState *nfds = FILTER_DUMP(obj);
186 uint32_t value = nfds->maxlen;
187
188 visit_type_uint32(v, name, &value, errp);
189}
190
191static void filter_dump_set_maxlen(Object *obj, Visitor *v, const char *name,
192 void *opaque, Error **errp)
193{
194 NetFilterDumpState *nfds = FILTER_DUMP(obj);
195 uint32_t value;
196
197 if (!visit_type_uint32(v, name, &value, errp)) {
198 return;
199 }
200 if (value == 0) {
201 error_setg(errp, "Property '%s.%s' doesn't take value '%u'",
202 object_get_typename(obj), name, value);
203 return;
204 }
205 nfds->maxlen = value;
206}
207
208static char *file_dump_get_filename(Object *obj, Error **errp)
209{
210 NetFilterDumpState *nfds = FILTER_DUMP(obj);
211
212 return g_strdup(nfds->filename);
213}
214
215static void file_dump_set_filename(Object *obj, const char *value, Error **errp)
216{
217 NetFilterDumpState *nfds = FILTER_DUMP(obj);
218
219 g_free(nfds->filename);
220 nfds->filename = g_strdup(value);
221}
222
223static void filter_dump_instance_init(Object *obj)
224{
225 NetFilterDumpState *nfds = FILTER_DUMP(obj);
226
227 nfds->maxlen = 65536;
228
229 object_property_add(obj, "maxlen", "uint32", filter_dump_get_maxlen,
230 filter_dump_set_maxlen, NULL, NULL);
231 object_property_add_str(obj, "file", file_dump_get_filename,
232 file_dump_set_filename);
233}
234
235static void filter_dump_instance_finalize(Object *obj)
236{
237 NetFilterDumpState *nfds = FILTER_DUMP(obj);
238
239 g_free(nfds->filename);
240}
241
242static void filter_dump_class_init(ObjectClass *oc, void *data)
243{
244 NetFilterClass *nfc = NETFILTER_CLASS(oc);
245
246 nfc->setup = filter_dump_setup;
247 nfc->cleanup = filter_dump_cleanup;
248 nfc->receive_iov = filter_dump_receive_iov;
249}
250
251static const TypeInfo filter_dump_info = {
252 .name = TYPE_FILTER_DUMP,
253 .parent = TYPE_NETFILTER,
254 .class_init = filter_dump_class_init,
255 .instance_init = filter_dump_instance_init,
256 .instance_finalize = filter_dump_instance_finalize,
257 .instance_size = sizeof(NetFilterDumpState),
258};
259
260static void filter_dump_register_types(void)
261{
262 type_register_static(&filter_dump_info);
263}
264
265type_init(filter_dump_register_types);