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
|
/*
* Self-announce
* (c) 2017-2019 Red Hat, Inc.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "net/announce.h"
#include "net/net.h"
#include "qapi/clone-visitor.h"
#include "qapi/qapi-visit-net.h"
#include "qapi/qapi-commands-net.h"
#include "trace.h"
int64_t qemu_announce_timer_step(AnnounceTimer *timer)
{
int64_t step;
step = timer->params.initial +
(timer->params.rounds - timer->round - 1) *
timer->params.step;
if (step < 0 || step > timer->params.max) {
step = timer->params.max;
}
timer_mod(timer->tm, qemu_clock_get_ms(timer->type) + step);
return step;
}
void qemu_announce_timer_del(AnnounceTimer *timer)
{
if (timer->tm) {
timer_del(timer->tm);
timer_free(timer->tm);
timer->tm = NULL;
}
}
/*
* Under BQL/main thread
* Reset the timer to the given parameters/type/notifier.
*/
void qemu_announce_timer_reset(AnnounceTimer *timer,
AnnounceParameters *params,
QEMUClockType type,
QEMUTimerCB *cb,
void *opaque)
{
/*
* We're under the BQL, so the current timer can't
* be firing, so we should be able to delete it.
*/
qemu_announce_timer_del(timer);
QAPI_CLONE_MEMBERS(AnnounceParameters, &timer->params, params);
timer->round = params->rounds;
timer->type = type;
timer->tm = timer_new_ms(type, cb, opaque);
}
#ifndef ETH_P_RARP
#define ETH_P_RARP 0x8035
#endif
#define ARP_HTYPE_ETH 0x0001
#define ARP_PTYPE_IP 0x0800
#define ARP_OP_REQUEST_REV 0x3
static int announce_self_create(uint8_t *buf,
uint8_t *mac_addr)
{
/* Ethernet header. */
memset(buf, 0xff, 6); /* destination MAC addr */
memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
*(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
/* RARP header. */
*(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
*(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
*(buf + 18) = 6; /* hardware addr length (ethernet) */
*(buf + 19) = 4; /* protocol addr length (IPv4) */
*(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
memcpy(buf + 22, mac_addr, 6); /* source hw addr */
memset(buf + 28, 0x00, 4); /* source protocol addr */
memcpy(buf + 32, mac_addr, 6); /* target hw addr */
memset(buf + 38, 0x00, 4); /* target protocol addr */
/* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
memset(buf + 42, 0x00, 18);
return 60; /* len (FCS will be added by hardware) */
}
static void qemu_announce_self_iter(NICState *nic, void *opaque)
{
uint8_t buf[60];
int len;
trace_qemu_announce_self_iter(qemu_ether_ntoa(&nic->conf->macaddr));
len = announce_self_create(buf, nic->conf->macaddr.a);
qemu_send_packet_raw(qemu_get_queue(nic), buf, len);
/* if the NIC provides it's own announcement support, use it as well */
if (nic->ncs->info->announce) {
nic->ncs->info->announce(nic->ncs);
}
}
static void qemu_announce_self_once(void *opaque)
{
AnnounceTimer *timer = (AnnounceTimer *)opaque;
qemu_foreach_nic(qemu_announce_self_iter, NULL);
if (--timer->round) {
qemu_announce_timer_step(timer);
} else {
qemu_announce_timer_del(timer);
}
}
void qemu_announce_self(AnnounceTimer *timer, AnnounceParameters *params)
{
qemu_announce_timer_reset(timer, params, QEMU_CLOCK_REALTIME,
qemu_announce_self_once, timer);
if (params->rounds) {
qemu_announce_self_once(timer);
} else {
qemu_announce_timer_del(timer);
}
}
void qmp_announce_self(AnnounceParameters *params, Error **errp)
{
static AnnounceTimer announce_timer;
qemu_announce_self(&announce_timer, params);
}
|
