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1 | /* |
2 | * libslirp | |
3 | * | |
4 | * Copyright (c) 2004-2008 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 | #include "qemu/osdep.h" | |
25 | ||
26 | #include "slirp.h" | |
27 | #include "state.h" | |
28 | #include "migration/vmstate.h" | |
29 | #include "migration/qemu-file-types.h" | |
30 | #include "migration/register.h" | |
31 | ||
32 | static int slirp_tcp_post_load(void *opaque, int version) | |
33 | { | |
34 | tcp_template((struct tcpcb *)opaque); | |
35 | ||
36 | return 0; | |
37 | } | |
38 | ||
39 | static const VMStateDescription vmstate_slirp_tcp = { | |
40 | .name = "slirp-tcp", | |
41 | .version_id = 0, | |
42 | .post_load = slirp_tcp_post_load, | |
43 | .fields = (VMStateField[]) { | |
44 | VMSTATE_INT16(t_state, struct tcpcb), | |
45 | VMSTATE_INT16_ARRAY(t_timer, struct tcpcb, TCPT_NTIMERS), | |
46 | VMSTATE_INT16(t_rxtshift, struct tcpcb), | |
47 | VMSTATE_INT16(t_rxtcur, struct tcpcb), | |
48 | VMSTATE_INT16(t_dupacks, struct tcpcb), | |
49 | VMSTATE_UINT16(t_maxseg, struct tcpcb), | |
50 | VMSTATE_UINT8(t_force, struct tcpcb), | |
51 | VMSTATE_UINT16(t_flags, struct tcpcb), | |
52 | VMSTATE_UINT32(snd_una, struct tcpcb), | |
53 | VMSTATE_UINT32(snd_nxt, struct tcpcb), | |
54 | VMSTATE_UINT32(snd_up, struct tcpcb), | |
55 | VMSTATE_UINT32(snd_wl1, struct tcpcb), | |
56 | VMSTATE_UINT32(snd_wl2, struct tcpcb), | |
57 | VMSTATE_UINT32(iss, struct tcpcb), | |
58 | VMSTATE_UINT32(snd_wnd, struct tcpcb), | |
59 | VMSTATE_UINT32(rcv_wnd, struct tcpcb), | |
60 | VMSTATE_UINT32(rcv_nxt, struct tcpcb), | |
61 | VMSTATE_UINT32(rcv_up, struct tcpcb), | |
62 | VMSTATE_UINT32(irs, struct tcpcb), | |
63 | VMSTATE_UINT32(rcv_adv, struct tcpcb), | |
64 | VMSTATE_UINT32(snd_max, struct tcpcb), | |
65 | VMSTATE_UINT32(snd_cwnd, struct tcpcb), | |
66 | VMSTATE_UINT32(snd_ssthresh, struct tcpcb), | |
67 | VMSTATE_INT16(t_idle, struct tcpcb), | |
68 | VMSTATE_INT16(t_rtt, struct tcpcb), | |
69 | VMSTATE_UINT32(t_rtseq, struct tcpcb), | |
70 | VMSTATE_INT16(t_srtt, struct tcpcb), | |
71 | VMSTATE_INT16(t_rttvar, struct tcpcb), | |
72 | VMSTATE_UINT16(t_rttmin, struct tcpcb), | |
73 | VMSTATE_UINT32(max_sndwnd, struct tcpcb), | |
74 | VMSTATE_UINT8(t_oobflags, struct tcpcb), | |
75 | VMSTATE_UINT8(t_iobc, struct tcpcb), | |
76 | VMSTATE_INT16(t_softerror, struct tcpcb), | |
77 | VMSTATE_UINT8(snd_scale, struct tcpcb), | |
78 | VMSTATE_UINT8(rcv_scale, struct tcpcb), | |
79 | VMSTATE_UINT8(request_r_scale, struct tcpcb), | |
80 | VMSTATE_UINT8(requested_s_scale, struct tcpcb), | |
81 | VMSTATE_UINT32(ts_recent, struct tcpcb), | |
82 | VMSTATE_UINT32(ts_recent_age, struct tcpcb), | |
83 | VMSTATE_UINT32(last_ack_sent, struct tcpcb), | |
84 | VMSTATE_END_OF_LIST() | |
85 | } | |
86 | }; | |
87 | ||
88 | /* The sbuf has a pair of pointers that are migrated as offsets; | |
89 | * we calculate the offsets and restore the pointers using | |
90 | * pre_save/post_load on a tmp structure. | |
91 | */ | |
92 | struct sbuf_tmp { | |
93 | struct sbuf *parent; | |
94 | uint32_t roff, woff; | |
95 | }; | |
96 | ||
97 | static int sbuf_tmp_pre_save(void *opaque) | |
98 | { | |
99 | struct sbuf_tmp *tmp = opaque; | |
100 | tmp->woff = tmp->parent->sb_wptr - tmp->parent->sb_data; | |
101 | tmp->roff = tmp->parent->sb_rptr - tmp->parent->sb_data; | |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
106 | static int sbuf_tmp_post_load(void *opaque, int version) | |
107 | { | |
108 | struct sbuf_tmp *tmp = opaque; | |
109 | uint32_t requested_len = tmp->parent->sb_datalen; | |
110 | ||
111 | /* Allocate the buffer space used by the field after the tmp */ | |
112 | sbreserve(tmp->parent, tmp->parent->sb_datalen); | |
113 | ||
114 | if (tmp->parent->sb_datalen != requested_len) { | |
115 | return -ENOMEM; | |
116 | } | |
117 | if (tmp->woff >= requested_len || | |
118 | tmp->roff >= requested_len) { | |
119 | g_critical("invalid sbuf offsets r/w=%u/%u len=%u", | |
120 | tmp->roff, tmp->woff, requested_len); | |
121 | return -EINVAL; | |
122 | } | |
123 | ||
124 | tmp->parent->sb_wptr = tmp->parent->sb_data + tmp->woff; | |
125 | tmp->parent->sb_rptr = tmp->parent->sb_data + tmp->roff; | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | ||
131 | static const VMStateDescription vmstate_slirp_sbuf_tmp = { | |
132 | .name = "slirp-sbuf-tmp", | |
133 | .post_load = sbuf_tmp_post_load, | |
134 | .pre_save = sbuf_tmp_pre_save, | |
135 | .version_id = 0, | |
136 | .fields = (VMStateField[]) { | |
137 | VMSTATE_UINT32(woff, struct sbuf_tmp), | |
138 | VMSTATE_UINT32(roff, struct sbuf_tmp), | |
139 | VMSTATE_END_OF_LIST() | |
140 | } | |
141 | }; | |
142 | ||
143 | static const VMStateDescription vmstate_slirp_sbuf = { | |
144 | .name = "slirp-sbuf", | |
145 | .version_id = 0, | |
146 | .fields = (VMStateField[]) { | |
147 | VMSTATE_UINT32(sb_cc, struct sbuf), | |
148 | VMSTATE_UINT32(sb_datalen, struct sbuf), | |
149 | VMSTATE_WITH_TMP(struct sbuf, struct sbuf_tmp, vmstate_slirp_sbuf_tmp), | |
150 | VMSTATE_VBUFFER_UINT32(sb_data, struct sbuf, 0, NULL, sb_datalen), | |
151 | VMSTATE_END_OF_LIST() | |
152 | } | |
153 | }; | |
154 | ||
155 | static bool slirp_older_than_v4(void *opaque, int version_id) | |
156 | { | |
157 | return version_id < 4; | |
158 | } | |
159 | ||
160 | static bool slirp_family_inet(void *opaque, int version_id) | |
161 | { | |
162 | union slirp_sockaddr *ssa = (union slirp_sockaddr *)opaque; | |
163 | return ssa->ss.ss_family == AF_INET; | |
164 | } | |
165 | ||
166 | static int slirp_socket_pre_load(void *opaque) | |
167 | { | |
168 | struct socket *so = opaque; | |
169 | if (tcp_attach(so) < 0) { | |
170 | return -ENOMEM; | |
171 | } | |
172 | /* Older versions don't load these fields */ | |
173 | so->so_ffamily = AF_INET; | |
174 | so->so_lfamily = AF_INET; | |
175 | return 0; | |
176 | } | |
177 | ||
178 | #ifndef _WIN32 | |
179 | #define VMSTATE_SIN4_ADDR(f, s, t) VMSTATE_UINT32_TEST(f, s, t) | |
180 | #else | |
181 | /* Win uses u_long rather than uint32_t - but it's still 32bits long */ | |
182 | #define VMSTATE_SIN4_ADDR(f, s, t) VMSTATE_SINGLE_TEST(f, s, t, 0, \ | |
183 | vmstate_info_uint32, u_long) | |
184 | #endif | |
185 | ||
186 | /* The OS provided ss_family field isn't that portable; it's size | |
187 | * and type varies (16/8 bit, signed, unsigned) | |
188 | * and the values it contains aren't fully portable. | |
189 | */ | |
190 | typedef struct SS_FamilyTmpStruct { | |
191 | union slirp_sockaddr *parent; | |
192 | uint16_t portable_family; | |
193 | } SS_FamilyTmpStruct; | |
194 | ||
195 | #define SS_FAMILY_MIG_IPV4 2 /* Linux, BSD, Win... */ | |
196 | #define SS_FAMILY_MIG_IPV6 10 /* Linux */ | |
197 | #define SS_FAMILY_MIG_OTHER 0xffff | |
198 | ||
199 | static int ss_family_pre_save(void *opaque) | |
200 | { | |
201 | SS_FamilyTmpStruct *tss = opaque; | |
202 | ||
203 | tss->portable_family = SS_FAMILY_MIG_OTHER; | |
204 | ||
205 | if (tss->parent->ss.ss_family == AF_INET) { | |
206 | tss->portable_family = SS_FAMILY_MIG_IPV4; | |
207 | } else if (tss->parent->ss.ss_family == AF_INET6) { | |
208 | tss->portable_family = SS_FAMILY_MIG_IPV6; | |
209 | } | |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
214 | static int ss_family_post_load(void *opaque, int version_id) | |
215 | { | |
216 | SS_FamilyTmpStruct *tss = opaque; | |
217 | ||
218 | switch (tss->portable_family) { | |
219 | case SS_FAMILY_MIG_IPV4: | |
220 | tss->parent->ss.ss_family = AF_INET; | |
221 | break; | |
222 | case SS_FAMILY_MIG_IPV6: | |
223 | case 23: /* compatibility: AF_INET6 from mingw */ | |
224 | case 28: /* compatibility: AF_INET6 from FreeBSD sys/socket.h */ | |
225 | tss->parent->ss.ss_family = AF_INET6; | |
226 | break; | |
227 | default: | |
228 | g_critical("invalid ss_family type %x", tss->portable_family); | |
229 | return -EINVAL; | |
230 | } | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | static const VMStateDescription vmstate_slirp_ss_family = { | |
236 | .name = "slirp-socket-addr/ss_family", | |
237 | .pre_save = ss_family_pre_save, | |
238 | .post_load = ss_family_post_load, | |
239 | .fields = (VMStateField[]) { | |
240 | VMSTATE_UINT16(portable_family, SS_FamilyTmpStruct), | |
241 | VMSTATE_END_OF_LIST() | |
242 | } | |
243 | }; | |
244 | ||
245 | static const VMStateDescription vmstate_slirp_socket_addr = { | |
246 | .name = "slirp-socket-addr", | |
247 | .version_id = 4, | |
248 | .fields = (VMStateField[]) { | |
249 | VMSTATE_WITH_TMP(union slirp_sockaddr, SS_FamilyTmpStruct, | |
250 | vmstate_slirp_ss_family), | |
251 | VMSTATE_SIN4_ADDR(sin.sin_addr.s_addr, union slirp_sockaddr, | |
252 | slirp_family_inet), | |
253 | VMSTATE_UINT16_TEST(sin.sin_port, union slirp_sockaddr, | |
254 | slirp_family_inet), | |
255 | ||
256 | #if 0 | |
257 | /* Untested: Needs checking by someone with IPv6 test */ | |
258 | VMSTATE_BUFFER_TEST(sin6.sin6_addr, union slirp_sockaddr, | |
259 | slirp_family_inet6), | |
260 | VMSTATE_UINT16_TEST(sin6.sin6_port, union slirp_sockaddr, | |
261 | slirp_family_inet6), | |
262 | VMSTATE_UINT32_TEST(sin6.sin6_flowinfo, union slirp_sockaddr, | |
263 | slirp_family_inet6), | |
264 | VMSTATE_UINT32_TEST(sin6.sin6_scope_id, union slirp_sockaddr, | |
265 | slirp_family_inet6), | |
266 | #endif | |
267 | ||
268 | VMSTATE_END_OF_LIST() | |
269 | } | |
270 | }; | |
271 | ||
272 | static const VMStateDescription vmstate_slirp_socket = { | |
273 | .name = "slirp-socket", | |
274 | .version_id = 4, | |
275 | .pre_load = slirp_socket_pre_load, | |
276 | .fields = (VMStateField[]) { | |
277 | VMSTATE_UINT32(so_urgc, struct socket), | |
278 | /* Pre-v4 versions */ | |
279 | VMSTATE_SIN4_ADDR(so_faddr.s_addr, struct socket, | |
280 | slirp_older_than_v4), | |
281 | VMSTATE_SIN4_ADDR(so_laddr.s_addr, struct socket, | |
282 | slirp_older_than_v4), | |
283 | VMSTATE_UINT16_TEST(so_fport, struct socket, slirp_older_than_v4), | |
284 | VMSTATE_UINT16_TEST(so_lport, struct socket, slirp_older_than_v4), | |
285 | /* v4 and newer */ | |
286 | VMSTATE_STRUCT(fhost, struct socket, 4, vmstate_slirp_socket_addr, | |
287 | union slirp_sockaddr), | |
288 | VMSTATE_STRUCT(lhost, struct socket, 4, vmstate_slirp_socket_addr, | |
289 | union slirp_sockaddr), | |
290 | ||
291 | VMSTATE_UINT8(so_iptos, struct socket), | |
292 | VMSTATE_UINT8(so_emu, struct socket), | |
293 | VMSTATE_UINT8(so_type, struct socket), | |
294 | VMSTATE_INT32(so_state, struct socket), | |
295 | VMSTATE_STRUCT(so_rcv, struct socket, 0, vmstate_slirp_sbuf, | |
296 | struct sbuf), | |
297 | VMSTATE_STRUCT(so_snd, struct socket, 0, vmstate_slirp_sbuf, | |
298 | struct sbuf), | |
299 | VMSTATE_STRUCT_POINTER(so_tcpcb, struct socket, vmstate_slirp_tcp, | |
300 | struct tcpcb), | |
301 | VMSTATE_END_OF_LIST() | |
302 | } | |
303 | }; | |
304 | ||
305 | static const VMStateDescription vmstate_slirp_bootp_client = { | |
306 | .name = "slirp_bootpclient", | |
307 | .fields = (VMStateField[]) { | |
308 | VMSTATE_UINT16(allocated, BOOTPClient), | |
309 | VMSTATE_BUFFER(macaddr, BOOTPClient), | |
310 | VMSTATE_END_OF_LIST() | |
311 | } | |
312 | }; | |
313 | ||
314 | static const VMStateDescription vmstate_slirp = { | |
315 | .name = "slirp", | |
316 | .version_id = 4, | |
317 | .fields = (VMStateField[]) { | |
318 | VMSTATE_UINT16_V(ip_id, Slirp, 2), | |
319 | VMSTATE_STRUCT_ARRAY(bootp_clients, Slirp, NB_BOOTP_CLIENTS, 3, | |
320 | vmstate_slirp_bootp_client, BOOTPClient), | |
321 | VMSTATE_END_OF_LIST() | |
322 | } | |
323 | }; | |
324 | ||
325 | static void slirp_state_save(QEMUFile *f, void *opaque) | |
326 | { | |
327 | Slirp *slirp = opaque; | |
328 | struct gfwd_list *ex_ptr; | |
329 | ||
330 | for (ex_ptr = slirp->guestfwd_list; ex_ptr; ex_ptr = ex_ptr->ex_next) | |
331 | if (ex_ptr->write_cb) { | |
332 | struct socket *so; | |
333 | so = slirp_find_ctl_socket(slirp, ex_ptr->ex_addr, | |
334 | ntohs(ex_ptr->ex_fport)); | |
335 | if (!so) { | |
336 | continue; | |
337 | } | |
338 | ||
339 | qemu_put_byte(f, 42); | |
340 | vmstate_save_state(f, &vmstate_slirp_socket, so, NULL); | |
341 | } | |
342 | qemu_put_byte(f, 0); | |
343 | ||
344 | vmstate_save_state(f, &vmstate_slirp, slirp, NULL); | |
345 | } | |
346 | ||
347 | ||
348 | static int slirp_state_load(QEMUFile *f, void *opaque, int version_id) | |
349 | { | |
350 | Slirp *slirp = opaque; | |
351 | struct gfwd_list *ex_ptr; | |
352 | ||
353 | while (qemu_get_byte(f)) { | |
354 | int ret; | |
355 | struct socket *so = socreate(slirp); | |
356 | ||
357 | ret = vmstate_load_state(f, &vmstate_slirp_socket, so, version_id); | |
358 | if (ret < 0) { | |
359 | return ret; | |
360 | } | |
361 | ||
362 | if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) != | |
363 | slirp->vnetwork_addr.s_addr) { | |
364 | return -EINVAL; | |
365 | } | |
366 | for (ex_ptr = slirp->guestfwd_list; ex_ptr; ex_ptr = ex_ptr->ex_next) { | |
367 | if (ex_ptr->write_cb && | |
368 | so->so_faddr.s_addr == ex_ptr->ex_addr.s_addr && | |
369 | so->so_fport == ex_ptr->ex_fport) { | |
370 | break; | |
371 | } | |
372 | } | |
373 | if (!ex_ptr) { | |
374 | return -EINVAL; | |
375 | } | |
376 | } | |
377 | ||
378 | return vmstate_load_state(f, &vmstate_slirp, slirp, version_id); | |
379 | } | |
380 | ||
381 | void slirp_state_register(Slirp *slirp) | |
382 | { | |
383 | static SaveVMHandlers savevm_slirp_state = { | |
384 | .save_state = slirp_state_save, | |
385 | .load_state = slirp_state_load, | |
386 | }; | |
387 | ||
388 | register_savevm_live(NULL, "slirp", 0, 4, &savevm_slirp_state, slirp); | |
389 | } | |
390 | ||
391 | void slirp_state_unregister(Slirp *slirp) | |
392 | { | |
393 | unregister_savevm(NULL, "slirp", slirp); | |
394 | } |