aboutsummaryrefslogtreecommitdiff
path: root/slirp/state.c
blob: 0e5a706e8778236f36f189bbe00cbcf17312ae64 (plain)
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
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
/*
 * libslirp
 *
 * Copyright (c) 2004-2008 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 "qemu/osdep.h"

#include "slirp.h"
#include "state.h"
#include "migration/vmstate.h"
#include "migration/qemu-file-types.h"
#include "migration/register.h"

static int slirp_tcp_post_load(void *opaque, int version)
{
    tcp_template((struct tcpcb *)opaque);

    return 0;
}

static const VMStateDescription vmstate_slirp_tcp = {
    .name = "slirp-tcp",
    .version_id = 0,
    .post_load = slirp_tcp_post_load,
    .fields = (VMStateField[]) {
        VMSTATE_INT16(t_state, struct tcpcb),
        VMSTATE_INT16_ARRAY(t_timer, struct tcpcb, TCPT_NTIMERS),
        VMSTATE_INT16(t_rxtshift, struct tcpcb),
        VMSTATE_INT16(t_rxtcur, struct tcpcb),
        VMSTATE_INT16(t_dupacks, struct tcpcb),
        VMSTATE_UINT16(t_maxseg, struct tcpcb),
        VMSTATE_UINT8(t_force, struct tcpcb),
        VMSTATE_UINT16(t_flags, struct tcpcb),
        VMSTATE_UINT32(snd_una, struct tcpcb),
        VMSTATE_UINT32(snd_nxt, struct tcpcb),
        VMSTATE_UINT32(snd_up, struct tcpcb),
        VMSTATE_UINT32(snd_wl1, struct tcpcb),
        VMSTATE_UINT32(snd_wl2, struct tcpcb),
        VMSTATE_UINT32(iss, struct tcpcb),
        VMSTATE_UINT32(snd_wnd, struct tcpcb),
        VMSTATE_UINT32(rcv_wnd, struct tcpcb),
        VMSTATE_UINT32(rcv_nxt, struct tcpcb),
        VMSTATE_UINT32(rcv_up, struct tcpcb),
        VMSTATE_UINT32(irs, struct tcpcb),
        VMSTATE_UINT32(rcv_adv, struct tcpcb),
        VMSTATE_UINT32(snd_max, struct tcpcb),
        VMSTATE_UINT32(snd_cwnd, struct tcpcb),
        VMSTATE_UINT32(snd_ssthresh, struct tcpcb),
        VMSTATE_INT16(t_idle, struct tcpcb),
        VMSTATE_INT16(t_rtt, struct tcpcb),
        VMSTATE_UINT32(t_rtseq, struct tcpcb),
        VMSTATE_INT16(t_srtt, struct tcpcb),
        VMSTATE_INT16(t_rttvar, struct tcpcb),
        VMSTATE_UINT16(t_rttmin, struct tcpcb),
        VMSTATE_UINT32(max_sndwnd, struct tcpcb),
        VMSTATE_UINT8(t_oobflags, struct tcpcb),
        VMSTATE_UINT8(t_iobc, struct tcpcb),
        VMSTATE_INT16(t_softerror, struct tcpcb),
        VMSTATE_UINT8(snd_scale, struct tcpcb),
        VMSTATE_UINT8(rcv_scale, struct tcpcb),
        VMSTATE_UINT8(request_r_scale, struct tcpcb),
        VMSTATE_UINT8(requested_s_scale, struct tcpcb),
        VMSTATE_UINT32(ts_recent, struct tcpcb),
        VMSTATE_UINT32(ts_recent_age, struct tcpcb),
        VMSTATE_UINT32(last_ack_sent, struct tcpcb),
        VMSTATE_END_OF_LIST()
    }
};

/* The sbuf has a pair of pointers that are migrated as offsets;
 * we calculate the offsets and restore the pointers using
 * pre_save/post_load on a tmp structure.
 */
struct sbuf_tmp {
    struct sbuf *parent;
    uint32_t roff, woff;
};

static int sbuf_tmp_pre_save(void *opaque)
{
    struct sbuf_tmp *tmp = opaque;
    tmp->woff = tmp->parent->sb_wptr - tmp->parent->sb_data;
    tmp->roff = tmp->parent->sb_rptr - tmp->parent->sb_data;

    return 0;
}

static int sbuf_tmp_post_load(void *opaque, int version)
{
    struct sbuf_tmp *tmp = opaque;
    uint32_t requested_len = tmp->parent->sb_datalen;

    /* Allocate the buffer space used by the field after the tmp */
    sbreserve(tmp->parent, tmp->parent->sb_datalen);

    if (tmp->parent->sb_datalen != requested_len) {
        return -ENOMEM;
    }
    if (tmp->woff >= requested_len ||
        tmp->roff >= requested_len) {
        g_critical("invalid sbuf offsets r/w=%u/%u len=%u",
                   tmp->roff, tmp->woff, requested_len);
        return -EINVAL;
    }

    tmp->parent->sb_wptr = tmp->parent->sb_data + tmp->woff;
    tmp->parent->sb_rptr = tmp->parent->sb_data + tmp->roff;

    return 0;
}


static const VMStateDescription vmstate_slirp_sbuf_tmp = {
    .name = "slirp-sbuf-tmp",
    .post_load = sbuf_tmp_post_load,
    .pre_save  = sbuf_tmp_pre_save,
    .version_id = 0,
    .fields = (VMStateField[]) {
        VMSTATE_UINT32(woff, struct sbuf_tmp),
        VMSTATE_UINT32(roff, struct sbuf_tmp),
        VMSTATE_END_OF_LIST()
    }
};

static const VMStateDescription vmstate_slirp_sbuf = {
    .name = "slirp-sbuf",
    .version_id = 0,
    .fields = (VMStateField[]) {
        VMSTATE_UINT32(sb_cc, struct sbuf),
        VMSTATE_UINT32(sb_datalen, struct sbuf),
        VMSTATE_WITH_TMP(struct sbuf, struct sbuf_tmp, vmstate_slirp_sbuf_tmp),
        VMSTATE_VBUFFER_UINT32(sb_data, struct sbuf, 0, NULL, sb_datalen),
        VMSTATE_END_OF_LIST()
    }
};

static bool slirp_older_than_v4(void *opaque, int version_id)
{
    return version_id < 4;
}

static bool slirp_family_inet(void *opaque, int version_id)
{
    union slirp_sockaddr *ssa = (union slirp_sockaddr *)opaque;
    return ssa->ss.ss_family == AF_INET;
}

static int slirp_socket_pre_load(void *opaque)
{
    struct socket *so = opaque;
    if (tcp_attach(so) < 0) {
        return -ENOMEM;
    }
    /* Older versions don't load these fields */
    so->so_ffamily = AF_INET;
    so->so_lfamily = AF_INET;
    return 0;
}

#ifndef _WIN32
#define VMSTATE_SIN4_ADDR(f, s, t) VMSTATE_UINT32_TEST(f, s, t)
#else
/* Win uses u_long rather than uint32_t - but it's still 32bits long */
#define VMSTATE_SIN4_ADDR(f, s, t) VMSTATE_SINGLE_TEST(f, s, t, 0, \
                                       vmstate_info_uint32, u_long)
#endif

/* The OS provided ss_family field isn't that portable; it's size
 * and type varies (16/8 bit, signed, unsigned)
 * and the values it contains aren't fully portable.
 */
typedef struct SS_FamilyTmpStruct {
    union slirp_sockaddr    *parent;
    uint16_t                 portable_family;
} SS_FamilyTmpStruct;

#define SS_FAMILY_MIG_IPV4   2  /* Linux, BSD, Win... */
#define SS_FAMILY_MIG_IPV6  10  /* Linux */
#define SS_FAMILY_MIG_OTHER 0xffff

static int ss_family_pre_save(void *opaque)
{
    SS_FamilyTmpStruct *tss = opaque;

    tss->portable_family = SS_FAMILY_MIG_OTHER;

    if (tss->parent->ss.ss_family == AF_INET) {
        tss->portable_family = SS_FAMILY_MIG_IPV4;
    } else if (tss->parent->ss.ss_family == AF_INET6) {
        tss->portable_family = SS_FAMILY_MIG_IPV6;
    }

    return 0;
}

static int ss_family_post_load(void *opaque, int version_id)
{
    SS_FamilyTmpStruct *tss = opaque;

    switch (tss->portable_family) {
    case SS_FAMILY_MIG_IPV4:
        tss->parent->ss.ss_family = AF_INET;
        break;
    case SS_FAMILY_MIG_IPV6:
    case 23: /* compatibility: AF_INET6 from mingw */
    case 28: /* compatibility: AF_INET6 from FreeBSD sys/socket.h */
        tss->parent->ss.ss_family = AF_INET6;
        break;
    default:
        g_critical("invalid ss_family type %x", tss->portable_family);
        return -EINVAL;
    }

    return 0;
}

static const VMStateDescription vmstate_slirp_ss_family = {
    .name = "slirp-socket-addr/ss_family",
    .pre_save  = ss_family_pre_save,
    .post_load = ss_family_post_load,
    .fields = (VMStateField[]) {
        VMSTATE_UINT16(portable_family, SS_FamilyTmpStruct),
        VMSTATE_END_OF_LIST()
    }
};

static const VMStateDescription vmstate_slirp_socket_addr = {
    .name = "slirp-socket-addr",
    .version_id = 4,
    .fields = (VMStateField[]) {
        VMSTATE_WITH_TMP(union slirp_sockaddr, SS_FamilyTmpStruct,
                            vmstate_slirp_ss_family),
        VMSTATE_SIN4_ADDR(sin.sin_addr.s_addr, union slirp_sockaddr,
                            slirp_family_inet),
        VMSTATE_UINT16_TEST(sin.sin_port, union slirp_sockaddr,
                            slirp_family_inet),

#if 0
        /* Untested: Needs checking by someone with IPv6 test */
        VMSTATE_BUFFER_TEST(sin6.sin6_addr, union slirp_sockaddr,
                            slirp_family_inet6),
        VMSTATE_UINT16_TEST(sin6.sin6_port, union slirp_sockaddr,
                            slirp_family_inet6),
        VMSTATE_UINT32_TEST(sin6.sin6_flowinfo, union slirp_sockaddr,
                            slirp_family_inet6),
        VMSTATE_UINT32_TEST(sin6.sin6_scope_id, union slirp_sockaddr,
                            slirp_family_inet6),
#endif

        VMSTATE_END_OF_LIST()
    }
};

static const VMStateDescription vmstate_slirp_socket = {
    .name = "slirp-socket",
    .version_id = 4,
    .pre_load = slirp_socket_pre_load,
    .fields = (VMStateField[]) {
        VMSTATE_UINT32(so_urgc, struct socket),
        /* Pre-v4 versions */
        VMSTATE_SIN4_ADDR(so_faddr.s_addr, struct socket,
                            slirp_older_than_v4),
        VMSTATE_SIN4_ADDR(so_laddr.s_addr, struct socket,
                            slirp_older_than_v4),
        VMSTATE_UINT16_TEST(so_fport, struct socket, slirp_older_than_v4),
        VMSTATE_UINT16_TEST(so_lport, struct socket, slirp_older_than_v4),
        /* v4 and newer */
        VMSTATE_STRUCT(fhost, struct socket, 4, vmstate_slirp_socket_addr,
                       union slirp_sockaddr),
        VMSTATE_STRUCT(lhost, struct socket, 4, vmstate_slirp_socket_addr,
                       union slirp_sockaddr),

        VMSTATE_UINT8(so_iptos, struct socket),
        VMSTATE_UINT8(so_emu, struct socket),
        VMSTATE_UINT8(so_type, struct socket),
        VMSTATE_INT32(so_state, struct socket),
        VMSTATE_STRUCT(so_rcv, struct socket, 0, vmstate_slirp_sbuf,
                       struct sbuf),
        VMSTATE_STRUCT(so_snd, struct socket, 0, vmstate_slirp_sbuf,
                       struct sbuf),
        VMSTATE_STRUCT_POINTER(so_tcpcb, struct socket, vmstate_slirp_tcp,
                       struct tcpcb),
        VMSTATE_END_OF_LIST()
    }
};

static const VMStateDescription vmstate_slirp_bootp_client = {
    .name = "slirp_bootpclient",
    .fields = (VMStateField[]) {
        VMSTATE_UINT16(allocated, BOOTPClient),
        VMSTATE_BUFFER(macaddr, BOOTPClient),
        VMSTATE_END_OF_LIST()
    }
};

static const VMStateDescription vmstate_slirp = {
    .name = "slirp",
    .version_id = 4,
    .fields = (VMStateField[]) {
        VMSTATE_UINT16_V(ip_id, Slirp, 2),
        VMSTATE_STRUCT_ARRAY(bootp_clients, Slirp, NB_BOOTP_CLIENTS, 3,
                             vmstate_slirp_bootp_client, BOOTPClient),
        VMSTATE_END_OF_LIST()
    }
};

static void slirp_state_save(QEMUFile *f, void *opaque)
{
    Slirp *slirp = opaque;
    struct gfwd_list *ex_ptr;

    for (ex_ptr = slirp->guestfwd_list; ex_ptr; ex_ptr = ex_ptr->ex_next)
        if (ex_ptr->write_cb) {
            struct socket *so;
            so = slirp_find_ctl_socket(slirp, ex_ptr->ex_addr,
                                       ntohs(ex_ptr->ex_fport));
            if (!so) {
                continue;
            }

            qemu_put_byte(f, 42);
            vmstate_save_state(f, &vmstate_slirp_socket, so, NULL);
        }
    qemu_put_byte(f, 0);

    vmstate_save_state(f, &vmstate_slirp, slirp, NULL);
}


static int slirp_state_load(QEMUFile *f, void *opaque, int version_id)
{
    Slirp *slirp = opaque;
    struct gfwd_list *ex_ptr;

    while (qemu_get_byte(f)) {
        int ret;
        struct socket *so = socreate(slirp);

        ret = vmstate_load_state(f, &vmstate_slirp_socket, so, version_id);
        if (ret < 0) {
            return ret;
        }

        if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) !=
            slirp->vnetwork_addr.s_addr) {
            return -EINVAL;
        }
        for (ex_ptr = slirp->guestfwd_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
            if (ex_ptr->write_cb &&
                so->so_faddr.s_addr == ex_ptr->ex_addr.s_addr &&
                so->so_fport == ex_ptr->ex_fport) {
                break;
            }
        }
        if (!ex_ptr) {
            return -EINVAL;
        }
    }

    return vmstate_load_state(f, &vmstate_slirp, slirp, version_id);
}

void slirp_state_register(Slirp *slirp)
{
    static SaveVMHandlers savevm_slirp_state = {
        .save_state = slirp_state_save,
        .load_state = slirp_state_load,
    };

    register_savevm_live(NULL, "slirp", 0, 4, &savevm_slirp_state, slirp);
}

void slirp_state_unregister(Slirp *slirp)
{
    unregister_savevm(NULL, "slirp", slirp);
}