qemu/net/dump.c
Thomas Huth 9d3e12e881 net/dump: Provide the dumping facility as a net-filter
Use the net-filter infrastructure to provide the dumping
functions for netdev devices, too.

Reviewed-by: Yang Hongyang <yanghy@cn.fujitsu.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
2015-10-27 10:30:35 +08:00

355 lines
9.1 KiB
C

/*
* QEMU System Emulator
*
* Copyright (c) 2003-2008 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "clients.h"
#include "qemu-common.h"
#include "qemu/error-report.h"
#include "qemu/iov.h"
#include "qemu/log.h"
#include "qemu/timer.h"
#include "qapi/visitor.h"
#include "net/filter.h"
typedef struct DumpState {
int64_t start_ts;
int fd;
int pcap_caplen;
} DumpState;
#define PCAP_MAGIC 0xa1b2c3d4
struct pcap_file_hdr {
uint32_t magic;
uint16_t version_major;
uint16_t version_minor;
int32_t thiszone;
uint32_t sigfigs;
uint32_t snaplen;
uint32_t linktype;
};
struct pcap_sf_pkthdr {
struct {
int32_t tv_sec;
int32_t tv_usec;
} ts;
uint32_t caplen;
uint32_t len;
};
static ssize_t dump_receive_iov(DumpState *s, const struct iovec *iov, int cnt)
{
struct pcap_sf_pkthdr hdr;
int64_t ts;
int caplen;
size_t size = iov_size(iov, cnt);
struct iovec dumpiov[cnt + 1];
/* Early return in case of previous error. */
if (s->fd < 0) {
return size;
}
ts = qemu_clock_get_us(QEMU_CLOCK_VIRTUAL);
caplen = size > s->pcap_caplen ? s->pcap_caplen : size;
hdr.ts.tv_sec = ts / 1000000 + s->start_ts;
hdr.ts.tv_usec = ts % 1000000;
hdr.caplen = caplen;
hdr.len = size;
dumpiov[0].iov_base = &hdr;
dumpiov[0].iov_len = sizeof(hdr);
cnt = iov_copy(&dumpiov[1], cnt, iov, cnt, 0, caplen);
if (writev(s->fd, dumpiov, cnt + 1) != sizeof(hdr) + caplen) {
qemu_log("-net dump write error - stop dump\n");
close(s->fd);
s->fd = -1;
}
return size;
}
static void dump_cleanup(DumpState *s)
{
close(s->fd);
s->fd = -1;
}
static int net_dump_state_init(DumpState *s, const char *filename,
int len, Error **errp)
{
struct pcap_file_hdr hdr;
struct tm tm;
int fd;
fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY | O_BINARY, 0644);
if (fd < 0) {
error_setg_errno(errp, errno, "-net dump: can't open %s", filename);
return -1;
}
hdr.magic = PCAP_MAGIC;
hdr.version_major = 2;
hdr.version_minor = 4;
hdr.thiszone = 0;
hdr.sigfigs = 0;
hdr.snaplen = len;
hdr.linktype = 1;
if (write(fd, &hdr, sizeof(hdr)) < sizeof(hdr)) {
error_setg_errno(errp, errno, "-net dump write error");
close(fd);
return -1;
}
s->fd = fd;
s->pcap_caplen = len;
qemu_get_timedate(&tm, 0);
s->start_ts = mktime(&tm);
return 0;
}
/* Dumping via VLAN netclient */
struct DumpNetClient {
NetClientState nc;
DumpState ds;
};
typedef struct DumpNetClient DumpNetClient;
static ssize_t dumpclient_receive(NetClientState *nc, const uint8_t *buf,
size_t size)
{
DumpNetClient *dc = DO_UPCAST(DumpNetClient, nc, nc);
struct iovec iov = {
.iov_base = (void *)buf,
.iov_len = size
};
return dump_receive_iov(&dc->ds, &iov, 1);
}
static ssize_t dumpclient_receive_iov(NetClientState *nc,
const struct iovec *iov, int cnt)
{
DumpNetClient *dc = DO_UPCAST(DumpNetClient, nc, nc);
return dump_receive_iov(&dc->ds, iov, cnt);
}
static void dumpclient_cleanup(NetClientState *nc)
{
DumpNetClient *dc = DO_UPCAST(DumpNetClient, nc, nc);
dump_cleanup(&dc->ds);
}
static NetClientInfo net_dump_info = {
.type = NET_CLIENT_OPTIONS_KIND_DUMP,
.size = sizeof(DumpNetClient),
.receive = dumpclient_receive,
.receive_iov = dumpclient_receive_iov,
.cleanup = dumpclient_cleanup,
};
int net_init_dump(const NetClientOptions *opts, const char *name,
NetClientState *peer, Error **errp)
{
int len, rc;
const char *file;
char def_file[128];
const NetdevDumpOptions *dump;
NetClientState *nc;
DumpNetClient *dnc;
assert(opts->kind == NET_CLIENT_OPTIONS_KIND_DUMP);
dump = opts->dump;
assert(peer);
if (dump->has_file) {
file = dump->file;
} else {
int id;
int ret;
ret = net_hub_id_for_client(peer, &id);
assert(ret == 0); /* peer must be on a hub */
snprintf(def_file, sizeof(def_file), "qemu-vlan%d.pcap", id);
file = def_file;
}
if (dump->has_len) {
if (dump->len > INT_MAX) {
error_setg(errp, "invalid length: %"PRIu64, dump->len);
return -1;
}
len = dump->len;
} else {
len = 65536;
}
nc = qemu_new_net_client(&net_dump_info, peer, "dump", name);
snprintf(nc->info_str, sizeof(nc->info_str),
"dump to %s (len=%d)", file, len);
dnc = DO_UPCAST(DumpNetClient, nc, nc);
rc = net_dump_state_init(&dnc->ds, file, len, errp);
if (rc) {
qemu_del_net_client(nc);
}
return rc;
}
/* Dumping via filter */
#define TYPE_FILTER_DUMP "filter-dump"
#define FILTER_DUMP(obj) \
OBJECT_CHECK(NetFilterDumpState, (obj), TYPE_FILTER_DUMP)
struct NetFilterDumpState {
NetFilterState nfs;
DumpState ds;
char *filename;
uint32_t maxlen;
};
typedef struct NetFilterDumpState NetFilterDumpState;
static ssize_t filter_dump_receive_iov(NetFilterState *nf, NetClientState *sndr,
unsigned flags, const struct iovec *iov,
int iovcnt, NetPacketSent *sent_cb)
{
NetFilterDumpState *nfds = FILTER_DUMP(nf);
dump_receive_iov(&nfds->ds, iov, iovcnt);
return 0;
}
static void filter_dump_cleanup(NetFilterState *nf)
{
NetFilterDumpState *nfds = FILTER_DUMP(nf);
dump_cleanup(&nfds->ds);
}
static void filter_dump_setup(NetFilterState *nf, Error **errp)
{
NetFilterDumpState *nfds = FILTER_DUMP(nf);
if (!nfds->filename) {
error_setg(errp, "dump filter needs 'file' property set!");
return;
}
net_dump_state_init(&nfds->ds, nfds->filename, nfds->maxlen, errp);
}
static void filter_dump_get_maxlen(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
NetFilterDumpState *nfds = FILTER_DUMP(obj);
uint32_t value = nfds->maxlen;
visit_type_uint32(v, &value, name, errp);
}
static void filter_dump_set_maxlen(Object *obj, Visitor *v, void *opaque,
const char *name, Error **errp)
{
NetFilterDumpState *nfds = FILTER_DUMP(obj);
Error *local_err = NULL;
uint32_t value;
visit_type_uint32(v, &value, name, &local_err);
if (local_err) {
goto out;
}
if (value == 0) {
error_setg(&local_err, "Property '%s.%s' doesn't take value '%u'",
object_get_typename(obj), name, value);
goto out;
}
nfds->maxlen = value;
out:
error_propagate(errp, local_err);
}
static char *file_dump_get_filename(Object *obj, Error **errp)
{
NetFilterDumpState *nfds = FILTER_DUMP(obj);
return g_strdup(nfds->filename);
}
static void file_dump_set_filename(Object *obj, const char *value, Error **errp)
{
NetFilterDumpState *nfds = FILTER_DUMP(obj);
g_free(nfds->filename);
nfds->filename = g_strdup(value);
}
static void filter_dump_instance_init(Object *obj)
{
NetFilterDumpState *nfds = FILTER_DUMP(obj);
nfds->maxlen = 65536;
object_property_add(obj, "maxlen", "int", filter_dump_get_maxlen,
filter_dump_set_maxlen, NULL, NULL, NULL);
object_property_add_str(obj, "file", file_dump_get_filename,
file_dump_set_filename, NULL);
}
static void filter_dump_class_init(ObjectClass *oc, void *data)
{
NetFilterClass *nfc = NETFILTER_CLASS(oc);
nfc->setup = filter_dump_setup;
nfc->cleanup = filter_dump_cleanup;
nfc->receive_iov = filter_dump_receive_iov;
}
static const TypeInfo filter_dump_info = {
.name = TYPE_FILTER_DUMP,
.parent = TYPE_NETFILTER,
.class_init = filter_dump_class_init,
.instance_init = filter_dump_instance_init,
.instance_size = sizeof(NetFilterDumpState),
};
static void filter_dump_register_types(void)
{
type_register_static(&filter_dump_info);
}
type_init(filter_dump_register_types);