1 | /* SPDX-License-Identifier: MIT */ |
2 | /* |
3 | * libslirp |
4 | * |
5 | * Copyright (c) 2004-2008 Fabrice Bellard |
6 | * |
7 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
8 | * of this software and associated documentation files (the "Software"), to deal |
9 | * in the Software without restriction, including without limitation the rights |
10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
11 | * copies of the Software, and to permit persons to whom the Software is |
12 | * furnished to do so, subject to the following conditions: |
13 | * |
14 | * The above copyright notice and this permission notice shall be included in |
15 | * all copies or substantial portions of the Software. |
16 | * |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
23 | * THE SOFTWARE. |
24 | */ |
25 | #include "slirp.h" |
26 | #include "vmstate.h" |
27 | #include "stream.h" |
28 | |
29 | static int slirp_tcp_post_load(void *opaque, int version) |
30 | { |
31 | tcp_template((struct tcpcb *)opaque); |
32 | |
33 | return 0; |
34 | } |
35 | |
36 | static const VMStateDescription vmstate_slirp_tcp = { |
37 | .name = "slirp-tcp" , |
38 | .version_id = 0, |
39 | .post_load = slirp_tcp_post_load, |
40 | .fields = (VMStateField[]){ VMSTATE_INT16(t_state, struct tcpcb), |
41 | VMSTATE_INT16_ARRAY(t_timer, struct tcpcb, |
42 | TCPT_NTIMERS), |
43 | VMSTATE_INT16(t_rxtshift, struct tcpcb), |
44 | VMSTATE_INT16(t_rxtcur, struct tcpcb), |
45 | VMSTATE_INT16(t_dupacks, struct tcpcb), |
46 | VMSTATE_UINT16(t_maxseg, struct tcpcb), |
47 | VMSTATE_UINT8(t_force, struct tcpcb), |
48 | VMSTATE_UINT16(t_flags, struct tcpcb), |
49 | VMSTATE_UINT32(snd_una, struct tcpcb), |
50 | VMSTATE_UINT32(snd_nxt, struct tcpcb), |
51 | VMSTATE_UINT32(snd_up, struct tcpcb), |
52 | VMSTATE_UINT32(snd_wl1, struct tcpcb), |
53 | VMSTATE_UINT32(snd_wl2, struct tcpcb), |
54 | VMSTATE_UINT32(iss, struct tcpcb), |
55 | VMSTATE_UINT32(snd_wnd, struct tcpcb), |
56 | VMSTATE_UINT32(rcv_wnd, struct tcpcb), |
57 | VMSTATE_UINT32(rcv_nxt, struct tcpcb), |
58 | VMSTATE_UINT32(rcv_up, struct tcpcb), |
59 | VMSTATE_UINT32(irs, struct tcpcb), |
60 | VMSTATE_UINT32(rcv_adv, struct tcpcb), |
61 | VMSTATE_UINT32(snd_max, struct tcpcb), |
62 | VMSTATE_UINT32(snd_cwnd, struct tcpcb), |
63 | VMSTATE_UINT32(snd_ssthresh, struct tcpcb), |
64 | VMSTATE_INT16(t_idle, struct tcpcb), |
65 | VMSTATE_INT16(t_rtt, struct tcpcb), |
66 | VMSTATE_UINT32(t_rtseq, struct tcpcb), |
67 | VMSTATE_INT16(t_srtt, struct tcpcb), |
68 | VMSTATE_INT16(t_rttvar, struct tcpcb), |
69 | VMSTATE_UINT16(t_rttmin, struct tcpcb), |
70 | VMSTATE_UINT32(max_sndwnd, struct tcpcb), |
71 | VMSTATE_UINT8(t_oobflags, struct tcpcb), |
72 | VMSTATE_UINT8(t_iobc, struct tcpcb), |
73 | VMSTATE_INT16(t_softerror, struct tcpcb), |
74 | VMSTATE_UINT8(snd_scale, struct tcpcb), |
75 | VMSTATE_UINT8(rcv_scale, struct tcpcb), |
76 | VMSTATE_UINT8(request_r_scale, struct tcpcb), |
77 | VMSTATE_UINT8(requested_s_scale, struct tcpcb), |
78 | VMSTATE_UINT32(ts_recent, struct tcpcb), |
79 | VMSTATE_UINT32(ts_recent_age, struct tcpcb), |
80 | VMSTATE_UINT32(last_ack_sent, struct tcpcb), |
81 | VMSTATE_END_OF_LIST() } |
82 | }; |
83 | |
84 | /* The sbuf has a pair of pointers that are migrated as offsets; |
85 | * we calculate the offsets and restore the pointers using |
86 | * pre_save/post_load on a tmp structure. |
87 | */ |
88 | struct sbuf_tmp { |
89 | struct sbuf *parent; |
90 | uint32_t roff, woff; |
91 | }; |
92 | |
93 | static int sbuf_tmp_pre_save(void *opaque) |
94 | { |
95 | struct sbuf_tmp *tmp = opaque; |
96 | tmp->woff = tmp->parent->sb_wptr - tmp->parent->sb_data; |
97 | tmp->roff = tmp->parent->sb_rptr - tmp->parent->sb_data; |
98 | |
99 | return 0; |
100 | } |
101 | |
102 | static int sbuf_tmp_post_load(void *opaque, int version) |
103 | { |
104 | struct sbuf_tmp *tmp = opaque; |
105 | uint32_t requested_len = tmp->parent->sb_datalen; |
106 | |
107 | /* Allocate the buffer space used by the field after the tmp */ |
108 | sbreserve(tmp->parent, tmp->parent->sb_datalen); |
109 | |
110 | if (tmp->parent->sb_datalen != requested_len) { |
111 | return -ENOMEM; |
112 | } |
113 | if (tmp->woff >= requested_len || tmp->roff >= requested_len) { |
114 | g_critical("invalid sbuf offsets r/w=%u/%u len=%u" , tmp->roff, |
115 | tmp->woff, requested_len); |
116 | return -EINVAL; |
117 | } |
118 | |
119 | tmp->parent->sb_wptr = tmp->parent->sb_data + tmp->woff; |
120 | tmp->parent->sb_rptr = tmp->parent->sb_data + tmp->roff; |
121 | |
122 | return 0; |
123 | } |
124 | |
125 | |
126 | static const VMStateDescription vmstate_slirp_sbuf_tmp = { |
127 | .name = "slirp-sbuf-tmp" , |
128 | .post_load = sbuf_tmp_post_load, |
129 | .pre_save = sbuf_tmp_pre_save, |
130 | .version_id = 0, |
131 | .fields = (VMStateField[]){ VMSTATE_UINT32(woff, struct sbuf_tmp), |
132 | VMSTATE_UINT32(roff, struct sbuf_tmp), |
133 | VMSTATE_END_OF_LIST() } |
134 | }; |
135 | |
136 | static const VMStateDescription vmstate_slirp_sbuf = { |
137 | .name = "slirp-sbuf" , |
138 | .version_id = 0, |
139 | .fields = (VMStateField[]){ VMSTATE_UINT32(sb_cc, struct sbuf), |
140 | VMSTATE_UINT32(sb_datalen, struct sbuf), |
141 | VMSTATE_WITH_TMP(struct sbuf, struct sbuf_tmp, |
142 | vmstate_slirp_sbuf_tmp), |
143 | VMSTATE_VBUFFER_UINT32(sb_data, struct sbuf, 0, |
144 | NULL, sb_datalen), |
145 | VMSTATE_END_OF_LIST() } |
146 | }; |
147 | |
148 | static bool slirp_older_than_v4(void *opaque, int version_id) |
149 | { |
150 | return version_id < 4; |
151 | } |
152 | |
153 | static bool slirp_family_inet(void *opaque, int version_id) |
154 | { |
155 | union slirp_sockaddr *ssa = (union slirp_sockaddr *)opaque; |
156 | return ssa->ss.ss_family == AF_INET; |
157 | } |
158 | |
159 | static int slirp_socket_pre_load(void *opaque) |
160 | { |
161 | struct socket *so = opaque; |
162 | if (tcp_attach(so) < 0) { |
163 | return -ENOMEM; |
164 | } |
165 | /* Older versions don't load these fields */ |
166 | so->so_ffamily = AF_INET; |
167 | so->so_lfamily = AF_INET; |
168 | return 0; |
169 | } |
170 | |
171 | #ifndef _WIN32 |
172 | #define VMSTATE_SIN4_ADDR(f, s, t) VMSTATE_UINT32_TEST(f, s, t) |
173 | #else |
174 | /* Win uses u_long rather than uint32_t - but it's still 32bits long */ |
175 | #define VMSTATE_SIN4_ADDR(f, s, t) \ |
176 | VMSTATE_SINGLE_TEST(f, s, t, 0, slirp_vmstate_info_uint32, u_long) |
177 | #endif |
178 | |
179 | /* The OS provided ss_family field isn't that portable; it's size |
180 | * and type varies (16/8 bit, signed, unsigned) |
181 | * and the values it contains aren't fully portable. |
182 | */ |
183 | typedef struct SS_FamilyTmpStruct { |
184 | union slirp_sockaddr *parent; |
185 | uint16_t portable_family; |
186 | } SS_FamilyTmpStruct; |
187 | |
188 | #define SS_FAMILY_MIG_IPV4 2 /* Linux, BSD, Win... */ |
189 | #define SS_FAMILY_MIG_IPV6 10 /* Linux */ |
190 | #define SS_FAMILY_MIG_OTHER 0xffff |
191 | |
192 | static int ss_family_pre_save(void *opaque) |
193 | { |
194 | SS_FamilyTmpStruct *tss = opaque; |
195 | |
196 | tss->portable_family = SS_FAMILY_MIG_OTHER; |
197 | |
198 | if (tss->parent->ss.ss_family == AF_INET) { |
199 | tss->portable_family = SS_FAMILY_MIG_IPV4; |
200 | } else if (tss->parent->ss.ss_family == AF_INET6) { |
201 | tss->portable_family = SS_FAMILY_MIG_IPV6; |
202 | } |
203 | |
204 | return 0; |
205 | } |
206 | |
207 | static int ss_family_post_load(void *opaque, int version_id) |
208 | { |
209 | SS_FamilyTmpStruct *tss = opaque; |
210 | |
211 | switch (tss->portable_family) { |
212 | case SS_FAMILY_MIG_IPV4: |
213 | tss->parent->ss.ss_family = AF_INET; |
214 | break; |
215 | case SS_FAMILY_MIG_IPV6: |
216 | case 23: /* compatibility: AF_INET6 from mingw */ |
217 | case 28: /* compatibility: AF_INET6 from FreeBSD sys/socket.h */ |
218 | tss->parent->ss.ss_family = AF_INET6; |
219 | break; |
220 | default: |
221 | g_critical("invalid ss_family type %x" , tss->portable_family); |
222 | return -EINVAL; |
223 | } |
224 | |
225 | return 0; |
226 | } |
227 | |
228 | static const VMStateDescription vmstate_slirp_ss_family = { |
229 | .name = "slirp-socket-addr/ss_family" , |
230 | .pre_save = ss_family_pre_save, |
231 | .post_load = ss_family_post_load, |
232 | .fields = |
233 | (VMStateField[]){ VMSTATE_UINT16(portable_family, SS_FamilyTmpStruct), |
234 | VMSTATE_END_OF_LIST() } |
235 | }; |
236 | |
237 | static const VMStateDescription vmstate_slirp_socket_addr = { |
238 | .name = "slirp-socket-addr" , |
239 | .version_id = 4, |
240 | .fields = |
241 | (VMStateField[]){ |
242 | VMSTATE_WITH_TMP(union slirp_sockaddr, SS_FamilyTmpStruct, |
243 | vmstate_slirp_ss_family), |
244 | VMSTATE_SIN4_ADDR(sin.sin_addr.s_addr, union slirp_sockaddr, |
245 | slirp_family_inet), |
246 | VMSTATE_UINT16_TEST(sin.sin_port, union slirp_sockaddr, |
247 | slirp_family_inet), |
248 | |
249 | #if 0 |
250 | /* Untested: Needs checking by someone with IPv6 test */ |
251 | VMSTATE_BUFFER_TEST(sin6.sin6_addr, union slirp_sockaddr, |
252 | slirp_family_inet6), |
253 | VMSTATE_UINT16_TEST(sin6.sin6_port, union slirp_sockaddr, |
254 | slirp_family_inet6), |
255 | VMSTATE_UINT32_TEST(sin6.sin6_flowinfo, union slirp_sockaddr, |
256 | slirp_family_inet6), |
257 | VMSTATE_UINT32_TEST(sin6.sin6_scope_id, union slirp_sockaddr, |
258 | slirp_family_inet6), |
259 | #endif |
260 | |
261 | VMSTATE_END_OF_LIST() } |
262 | }; |
263 | |
264 | static const VMStateDescription vmstate_slirp_socket = { |
265 | .name = "slirp-socket" , |
266 | .version_id = 4, |
267 | .pre_load = slirp_socket_pre_load, |
268 | .fields = |
269 | (VMStateField[]){ |
270 | VMSTATE_UINT32(so_urgc, struct socket), |
271 | /* Pre-v4 versions */ |
272 | VMSTATE_SIN4_ADDR(so_faddr.s_addr, struct socket, |
273 | slirp_older_than_v4), |
274 | VMSTATE_SIN4_ADDR(so_laddr.s_addr, struct socket, |
275 | slirp_older_than_v4), |
276 | VMSTATE_UINT16_TEST(so_fport, struct socket, slirp_older_than_v4), |
277 | VMSTATE_UINT16_TEST(so_lport, struct socket, slirp_older_than_v4), |
278 | /* v4 and newer */ |
279 | VMSTATE_STRUCT(fhost, struct socket, 4, vmstate_slirp_socket_addr, |
280 | union slirp_sockaddr), |
281 | VMSTATE_STRUCT(lhost, struct socket, 4, vmstate_slirp_socket_addr, |
282 | union slirp_sockaddr), |
283 | |
284 | VMSTATE_UINT8(so_iptos, struct socket), |
285 | VMSTATE_UINT8(so_emu, struct socket), |
286 | VMSTATE_UINT8(so_type, struct socket), |
287 | VMSTATE_INT32(so_state, struct socket), |
288 | VMSTATE_STRUCT(so_rcv, struct socket, 0, vmstate_slirp_sbuf, |
289 | struct sbuf), |
290 | VMSTATE_STRUCT(so_snd, struct socket, 0, vmstate_slirp_sbuf, |
291 | struct sbuf), |
292 | VMSTATE_STRUCT_POINTER(so_tcpcb, struct socket, vmstate_slirp_tcp, |
293 | struct tcpcb), |
294 | VMSTATE_END_OF_LIST() } |
295 | }; |
296 | |
297 | static const VMStateDescription vmstate_slirp_bootp_client = { |
298 | .name = "slirp_bootpclient" , |
299 | .fields = (VMStateField[]){ VMSTATE_UINT16(allocated, BOOTPClient), |
300 | VMSTATE_BUFFER(macaddr, BOOTPClient), |
301 | VMSTATE_END_OF_LIST() } |
302 | }; |
303 | |
304 | static const VMStateDescription vmstate_slirp = { |
305 | .name = "slirp" , |
306 | .version_id = 4, |
307 | .fields = (VMStateField[]){ VMSTATE_UINT16_V(ip_id, Slirp, 2), |
308 | VMSTATE_STRUCT_ARRAY( |
309 | bootp_clients, Slirp, NB_BOOTP_CLIENTS, 3, |
310 | vmstate_slirp_bootp_client, BOOTPClient), |
311 | VMSTATE_END_OF_LIST() } |
312 | }; |
313 | |
314 | void slirp_state_save(Slirp *slirp, SlirpWriteCb write_cb, void *opaque) |
315 | { |
316 | struct gfwd_list *ex_ptr; |
317 | SlirpOStream f = { |
318 | .write_cb = write_cb, |
319 | .opaque = opaque, |
320 | }; |
321 | |
322 | for (ex_ptr = slirp->guestfwd_list; ex_ptr; ex_ptr = ex_ptr->ex_next) |
323 | if (ex_ptr->write_cb) { |
324 | struct socket *so; |
325 | so = slirp_find_ctl_socket(slirp, ex_ptr->ex_addr, |
326 | ntohs(ex_ptr->ex_fport)); |
327 | if (!so) { |
328 | continue; |
329 | } |
330 | |
331 | slirp_ostream_write_u8(&f, 42); |
332 | slirp_vmstate_save_state(&f, &vmstate_slirp_socket, so); |
333 | } |
334 | slirp_ostream_write_u8(&f, 0); |
335 | |
336 | slirp_vmstate_save_state(&f, &vmstate_slirp, slirp); |
337 | } |
338 | |
339 | |
340 | int slirp_state_load(Slirp *slirp, int version_id, SlirpReadCb read_cb, |
341 | void *opaque) |
342 | { |
343 | struct gfwd_list *ex_ptr; |
344 | SlirpIStream f = { |
345 | .read_cb = read_cb, |
346 | .opaque = opaque, |
347 | }; |
348 | |
349 | while (slirp_istream_read_u8(&f)) { |
350 | int ret; |
351 | struct socket *so = socreate(slirp); |
352 | |
353 | ret = |
354 | slirp_vmstate_load_state(&f, &vmstate_slirp_socket, so, version_id); |
355 | if (ret < 0) { |
356 | return ret; |
357 | } |
358 | |
359 | if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) != |
360 | slirp->vnetwork_addr.s_addr) { |
361 | return -EINVAL; |
362 | } |
363 | for (ex_ptr = slirp->guestfwd_list; ex_ptr; ex_ptr = ex_ptr->ex_next) { |
364 | if (ex_ptr->write_cb && |
365 | so->so_faddr.s_addr == ex_ptr->ex_addr.s_addr && |
366 | so->so_fport == ex_ptr->ex_fport) { |
367 | break; |
368 | } |
369 | } |
370 | if (!ex_ptr) { |
371 | return -EINVAL; |
372 | } |
373 | } |
374 | |
375 | return slirp_vmstate_load_state(&f, &vmstate_slirp, slirp, version_id); |
376 | } |
377 | |
378 | int slirp_state_version(void) |
379 | { |
380 | return 4; |
381 | } |
382 | |