bootp.c@ 22315

Last change on this file since 22315 was 22225, checked in by vboxsync, 16 years ago
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1	/*
2	* QEMU BOOTP/DHCP server
3	*
4	* Copyright (c) 2004 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 <slirp.h>
25
26	/* XXX: only DHCP is supported */
27
28	static const uint8_t rfc1533_cookie[] = { RFC1533_COOKIE };
29	static void bootp_reply(PNATState pData, struct mbuf *m0, int off, uint16_t flags);
30
31	static uint8_t dhcp_find_option(uint8_t vend, uint8_t tag)
32	{
33	uint8_t *q = vend;
34	uint8_t len;
35	/@todo magic validation /
36	q += 4; /magic/
37	while(*q != RFC1533_END)
38	{
39	if (*q == RFC1533_PAD)
40	continue;
41	if (*q == tag)
42	return q;
43	q++;
44	len = *q;
45	q += 1 + len;
46	}
47	return NULL;
48	}
49	static BOOTPClient *alloc_addr(PNATState pData)
50	{
51	int i;
52	for (i = 0; i < NB_ADDR; i++)
53	{
54	if (!bootp_clients[i].allocated)
55	{
56	BOOTPClient *bc;
57
58	bc = &bootp_clients[i];
59	memset(bc, 0, sizeof(BOOTPClient));
60	bc->allocated = 1;
61	bc->number = i;
62	return bc;
63	}
64	}
65	return NULL;
66	}
67	static BOOTPClient get_new_addr(PNATState pData, struct in_addr paddr)
68	{
69	BOOTPClient *bc;
70	bc = alloc_addr(pData);
71	if (bc == NULL)
72	return NULL;
73	paddr->s_addr = htonl(ntohl(special_addr.s_addr) \| (bc->number + START_ADDR));
74	bc->addr.s_addr = paddr->s_addr;
75	return bc;
76	return NULL;
77	}
78
79	static int release_addr(PNATState pData, struct in_addr *paddr)
80	{
81	unsigned i;
82	for (i = 0; i < NB_ADDR; i++)
83	{
84	if (paddr->s_addr == bootp_clients[i].addr.s_addr)
85	{
86	memset(&bootp_clients[i], 0, sizeof(BOOTPClient));
87	return 1;
88	}
89	}
90	return 0;
91	}
92
93	/*
94	* from RFC 2131 4.3.1
95	* Field DHCPOFFER DHCPACK DHCPNAK
96	* ----- --------- ------- -------
97	* 'op' BOOTREPLY BOOTREPLY BOOTREPLY
98	* 'htype' (From "Assigned Numbers" RFC)
99	* 'hlen' (Hardware address length in octets)
100	* 'hops' 0 0 0
101	* 'xid' 'xid' from client 'xid' from client 'xid' from client
102	* DHCPDISCOVER DHCPREQUEST DHCPREQUEST
103	* message message message
104	* 'secs' 0 0 0
105	* 'ciaddr' 0 'ciaddr' from 0
106	* DHCPREQUEST or 0
107	* 'yiaddr' IP address offered IP address 0
108	* to client assigned to client
109	* 'siaddr' IP address of next IP address of next 0
110	* bootstrap server bootstrap server
111	* 'flags' 'flags' from 'flags' from 'flags' from
112	* client DHCPDISCOVER client DHCPREQUEST client DHCPREQUEST
113	* message message message
114	* 'giaddr' 'giaddr' from 'giaddr' from 'giaddr' from
115	* client DHCPDISCOVER client DHCPREQUEST client DHCPREQUEST
116	* message message message
117	* 'chaddr' 'chaddr' from 'chaddr' from 'chaddr' from
118	* client DHCPDISCOVER client DHCPREQUEST client DHCPREQUEST
119	* message message message
120	* 'sname' Server host name Server host name (unused)
121	* or options or options
122	* 'file' Client boot file Client boot file (unused)
123	* name or options name or options
124	* 'options' options options
125	*
126	* Option DHCPOFFER DHCPACK DHCPNAK
127	* ------ --------- ------- -------
128	* Requested IP address MUST NOT MUST NOT MUST NOT
129	* IP address lease time MUST MUST (DHCPREQUEST) MUST NOT
130	* MUST NOT (DHCPINFORM)
131	* Use 'file'/'sname' fields MAY MAY MUST NOT
132	* DHCP message type DHCPOFFER DHCPACK DHCPNAK
133	* Parameter request list MUST NOT MUST NOT MUST NOT
134	* Message SHOULD SHOULD SHOULD
135	* Client identifier MUST NOT MUST NOT MAY
136	* Vendor class identifier MAY MAY MAY
137	* Server identifier MUST MUST MUST
138	* Maximum message size MUST NOT MUST NOT MUST NOT
139	* All others MAY MAY MUST NOT
140	*/
141	static BOOTPClient find_addr(PNATState pData, struct in_addr paddr, const uint8_t *macaddr)
142	{
143	int i;
144
145	for (i = 0; i < NB_ADDR; i++)
146	{
147	if (!memcmp(macaddr, bootp_clients[i].macaddr, 6))
148	{
149	BOOTPClient *bc;
150
151	bc = &bootp_clients[i];
152	bc->allocated = 1;
153	paddr->s_addr = htonl(ntohl(special_addr.s_addr) \| (i + START_ADDR));
154	return bc;
155	}
156	}
157	return NULL;
158	}
159
160	static struct mbuf dhcp_create_msg(PNATState pData, struct bootp_t bp, struct mbuf *m, uint8_t type)
161	{
162	struct bootp_t *rbp;
163	struct ethhdr *eh;
164	uint8_t *q;
165
166	rbp = mtod(m, struct bootp_t *);
167	memset(rbp, 0, sizeof(struct bootp_t));
168	eh = mtod(m, struct ethhdr *);
169	memcpy(eh->h_source, bp->bp_hwaddr, ETH_ALEN); /* XXX: if_encap just swap source with dest*/
170	m->m_data += if_maxlinkhdr; /reserve ether header /
171	rbp = mtod(m, struct bootp_t *);
172	rbp->bp_op = BOOTP_REPLY;
173	rbp->bp_xid = bp->bp_xid; /* see table 3 of rfc2131*/
174	rbp->bp_flags = bp->bp_flags;
175	rbp->bp_giaddr.s_addr = bp->bp_giaddr.s_addr;
176	#if 0 /check flags/
177	saddr.sin_port = htons(BOOTP_SERVER);
178	daddr.sin_port = htons(BOOTP_CLIENT);
179	#endif
180	rbp->bp_htype = 1;
181	rbp->bp_hlen = 6;
182	memcpy(rbp->bp_hwaddr, bp->bp_hwaddr, 6);
183
184	memcpy(rbp->bp_vend, rfc1533_cookie, 4); /* cookie */
185	q = rbp->bp_vend;
186	q += 4;
187	*q++ = RFC2132_MSG_TYPE;
188	*q++ = 1;
189	*q++ = type;
190
191	return m;
192	}
193
194	static int dhcp_do_ack_offer(PNATState pData, struct mbuf m, BOOTPClient bc, int is_from_request)
195	{
196	int off = 0;
197	struct bootp_t *rbp = NULL;
198	uint8_t *q;
199	struct in_addr saddr;
200	int val;
201
202	struct dns_entry *de = NULL;
203	struct dns_domain_entry *dd = NULL;
204	int added = 0;
205	uint8_t *q_dns_header = NULL;
206	uint32_t lease_time = htonl(LEASE_TIME);
207	uint32_t netmask = htonl(pData->netmask);
208
209	rbp = mtod(m, struct bootp_t *);
210	q = &rbp->bp_vend[0];
211	q += 7; /* !cookie rfc 2132 + TYPE*/
212
213	/DHCP Offer specific/
214	if ( tftp_prefix
215	&& RTDirExists(tftp_prefix)
216	&& bootp_filename)
217	RTStrPrintf((char*)rbp->bp_file, sizeof(rbp->bp_file), "%s", bootp_filename);
218
219	Log(("NAT: DHCP: bp_file:%s\n", &rbp->bp_file));
220	/* Address/port of the DHCP server. */
221	rbp->bp_yiaddr = bc->addr; /* Client IP address */
222	Log(("NAT: DHCP: bp_yiaddr:%R[IP4]\n", &rbp->bp_yiaddr));
223	rbp->bp_siaddr = pData->tftp_server; /* Next Server IP address, i.e. TFTP */
224	Log(("NAT: DHCP: bp_siaddr:%R[IP4]\n", &rbp->bp_siaddr));
225	if (is_from_request)
226	{
227	rbp->bp_ciaddr.s_addr = bc->addr.s_addr; /* Client IP address */
228	}
229	#ifndef VBOX_WITH_NAT_SERVICE
230	saddr.s_addr = htonl(ntohl(special_addr.s_addr) \| CTL_ALIAS);
231	#else
232	saddr.s_addr = special_addr.s_addr;
233	#endif
234	Log(("NAT: DHCP: s_addr:%R[IP4]\n", &saddr));
235
236	#define FILL_BOOTP_EXT(q, tag, len, pvalue) \
237	do { \
238	struct bootp_ext be = (struct bootp_ext )(q); \
239	be->bpe_tag = (tag); \
240	be->bpe_len = (len); \
241	memcpy(&be[1], (pvalue), (len)); \
242	(q) = (uint8_t *)(&be[1]) + (len); \
243	}while(0)
244	/* appending another value to tag, calculates len of whole block*/
245	#define FILL_BOOTP_APP(head, q, tag, len, pvalue) \
246	do { \
247	struct bootp_ext be = (struct bootp_ext )(head); \
248	memcpy(q, (pvalue), (len)); \
249	(q) += (len); \
250	Assert(be->bpe_tag == (tag)); \
251	be->bpe_len += (len); \
252	}while(0)
253
254
255
256	FILL_BOOTP_EXT(q, RFC1533_NETMASK, 4, &netmask);
257	FILL_BOOTP_EXT(q, RFC1533_GATEWAY, 4, &saddr);
258
259	if (pData->use_dns_proxy)
260	{
261	uint32_t addr = htonl(ntohl(special_addr.s_addr) \| CTL_DNS);
262	FILL_BOOTP_EXT(q, RFC1533_DNS, 4, &addr);
263	goto skip_dns_servers;
264	}
265
266	if (!TAILQ_EMPTY(&pData->dns_list_head))
267	{
268	de = TAILQ_LAST(&pData->dns_list_head, dns_list_head);
269	q_dns_header = q;
270	FILL_BOOTP_EXT(q, RFC1533_DNS, 4, &de->de_addr.s_addr);
271	}
272
273	TAILQ_FOREACH_REVERSE(de, &pData->dns_list_head, dns_list_head, de_list)
274	{
275	if (TAILQ_LAST(&pData->dns_list_head, dns_list_head) == de)
276	continue; /* first value with head we've ingected before */
277	FILL_BOOTP_APP(q_dns_header, q, RFC1533_DNS, 4, &de->de_addr.s_addr);
278	}
279
280	skip_dns_servers:
281	if (LIST_EMPTY(&pData->dns_domain_list_head))
282	{
283	/* Microsoft dhcp client doen't like domain-less dhcp and trimmed packets*/
284	/* dhcpcd client very sad if no domain name is passed */
285	FILL_BOOTP_EXT(q, RFC1533_DOMAINNAME, 1, " ");
286	}
287	if (pData->fPassDomain)
288	{
289	LIST_FOREACH(dd, &pData->dns_domain_list_head, dd_list)
290	{
291
292	if (dd->dd_pszDomain == NULL)
293	continue;
294	/* never meet valid separator here in RFC1533*/
295	if (added != 0)
296	FILL_BOOTP_EXT(q, RFC1533_DOMAINNAME, 1, ",");
297	else
298	added = 1;
299	val = (int)strlen(dd->dd_pszDomain);
300	FILL_BOOTP_EXT(q, RFC1533_DOMAINNAME, val, dd->dd_pszDomain);
301	}
302	}
303
304	FILL_BOOTP_EXT(q, RFC2132_LEASE_TIME, 4, &lease_time);
305
306	if (*slirp_hostname)
307	{
308	val = (int)strlen(slirp_hostname);
309	FILL_BOOTP_EXT(q, RFC1533_HOSTNAME, val, slirp_hostname);
310	}
311	return q - rbp->bp_vend; /return offset /
312	}
313
314	static int dhcp_send_nack(PNATState pData, struct bootp_t bp, BOOTPClient bc, struct mbuf *m)
315	{
316	struct bootp_t *rbp;
317	uint8_t *q = NULL;
318	rbp = mtod(m, struct bootp_t *);
319
320	dhcp_create_msg(pData, bp, m, DHCPNAK);
321
322	return 7;
323	}
324	static int dhcp_send_ack(PNATState pData, struct bootp_t bp, BOOTPClient bc, struct mbuf *m, int is_from_request)
325	{
326	struct bootp_t *rbp;
327	int off = 0; /* boot_reply will fill general options and add END before sending response*/
328
329	dhcp_create_msg(pData, bp, m, DHCPACK);
330	off = dhcp_do_ack_offer(pData, m, bc, is_from_request);
331	return off;
332	}
333	static int dhcp_send_offer(PNATState pData, struct bootp_t bp, BOOTPClient bc, struct mbuf *m)
334	{
335	int off = 0; /* boot_reply will fill general options and add END before sending response*/
336
337	dhcp_create_msg(pData, bp, m, DHCPOFFER);
338	off = dhcp_do_ack_offer(pData, m, bc, 0);
339	return off;
340	}
341
342	/**
343	* decoding client messages RFC2131 (4.3.6)
344	* ---------------------------------------------------------------------
345	* \| \|INIT-REBOOT \|SELECTING \|RENEWING \|REBINDING \|
346	* ---------------------------------------------------------------------
347	* \|broad/unicast \|broadcast \|broadcast \|unicast \|broadcast \|
348	* \|server-ip \|MUST NOT \|MUST \|MUST NOT \|MUST NOT \|
349	* \|requested-ip \|MUST \|MUST \|MUST NOT \|MUST NOT \|
350	* \|ciaddr \|zero \|zero \|IP address \|IP address\|
351	* ---------------------------------------------------------------------
352	*
353	*/
354	enum DHCP_REQUEST_STATES{INIT_REBOOT, SELECTING, RENEWING, REBINDING, NONE};
355	static int dhcp_decode_request(PNATState pData, struct bootp_t bp, const uint8_t buf, int size, struct mbuf *m)
356	{
357	BOOTPClient *bc = NULL;
358	struct in_addr daddr;
359	int off;
360	uint8_t *opt;
361	uint8_t *req_ip = NULL;
362	uint8_t *server_ip = NULL;
363	uint32_t ui32;
364	enum DHCP_REQUEST_STATES dhcp_stat = NONE;
365	/need to understand which type of request we get /
366	req_ip = dhcp_find_option(&bp->bp_vend[0], RFC2132_REQ_ADDR);
367	server_ip = dhcp_find_option(&bp->bp_vend[0], RFC2132_SRV_ID);
368	bc = find_addr(pData, &daddr, bp->bp_hwaddr);
369
370	if (server_ip != NULL)
371	{
372	/selecting/
373	if (!bc)
374	{
375	LogRel(("NAT: DHCP no IP wasn't allocated\n"));
376	return -1;
377	}
378	dhcp_stat = SELECTING;
379	Assert((bp->bp_ciaddr.s_addr == INADDR_ANY));
380	Assert(((uint32_t )(req_ip + 2) == bc->addr.s_addr)); /the same address as in offer/
381	#if 0
382	/* DSL xid in request differ from offer */
383	Assert((bp->bp_xid == bc->xid));
384	#endif
385	}
386	else
387	{
388	if (req_ip != NULL)
389	{
390	/* init-reboot */
391	dhcp_stat = INIT_REBOOT;
392	}
393	else
394	{
395	/see table 4 rfc2131/
396	if (bp->bp_flags & DHCP_FLAGS_B)
397	dhcp_stat = REBINDING;
398	else
399	dhcp_stat = RENEWING;
400	}
401	}
402	/?? renewing ??/
403	switch (dhcp_stat)
404	{
405	case RENEWING:
406	{
407	Assert(( server_ip == NULL
408	&& req_ip == NULL
409	&& bp->bp_ciaddr.s_addr != INADDR_ANY));
410	if (bc != NULL)
411	{
412	Assert((bc->addr.s_addr == bp->bp_ciaddr.s_addr));
413	/if it already here well just do ack, we aren't aware of dhcp time expiration/
414	}
415	else
416	{
417	if ((bp->bp_ciaddr.s_addr & htonl(pData->netmask)) != special_addr.s_addr)
418	{
419	off = dhcp_send_nack(pData, bp, bc, m);
420	return off;
421	}
422	bc = alloc_addr(pData);
423	if (bc == NULL)
424	{
425	LogRel(("NAT: can't alloc address. RENEW has been silently ignored\n"));
426	return -1;
427	}
428	Assert((bp->bp_hlen == ETH_ALEN));
429	memcpy(bc->macaddr, bp->bp_hwaddr, bp->bp_hlen);
430	bc->addr.s_addr = bp->bp_ciaddr.s_addr;
431	}
432	}
433	break;
434	case INIT_REBOOT:
435	Assert(server_ip == NULL);
436	Assert(req_ip != NULL);
437	ui32 = (uint32_t )(req_ip + 2);
438	if ((ui32 & htonl(pData->netmask)) != special_addr.s_addr)
439	{
440	LogRel(("NAT: address %R[IP4] has been req.\n", &ui32));
441	off = dhcp_send_nack(pData, bp, bc, m);
442	return off;
443	}
444	bc = alloc_addr(pData);
445	if (bc == NULL)
446	{
447	LogRel(("NAT: can't alloc address. RENEW has been silently ignored\n"));
448	return -1;
449	}
450	Assert((bp->bp_hlen == ETH_ALEN));
451	memcpy(bc->macaddr, bp->bp_hwaddr, bp->bp_hlen);
452	bc->addr.s_addr = ui32;
453	break;
454	case NONE:
455	Assert((dhcp_stat != NONE));
456	return -1;
457	default:
458	break;
459	}
460	off = dhcp_send_ack(pData, bp, bc, m, 1);
461	return off;
462	}
463
464	static int dhcp_decode_discover(PNATState pData, struct bootp_t bp, const uint8_t buf, int size, int flag, struct mbuf *m)
465	{
466	BOOTPClient *bc;
467	struct in_addr daddr;
468	int off;
469	/* flag == 1 discover */
470	if (flag == 1)
471	{
472	bc = find_addr(pData, &daddr, bp->bp_hwaddr);
473	if (!bc)
474	{
475	bc = get_new_addr(pData, &daddr);
476	if (!bc)
477	{
478	LogRel(("NAT: DHCP no IP address left\n"));
479	Log(("no address left\n"));
480	return -1;
481	}
482	memcpy(bc->macaddr, bp->bp_hwaddr, 6);
483	}
484	bc->xid = bp->bp_xid;
485	/bc isn't NULL /
486	off = dhcp_send_offer(pData, bp, bc, m);
487	return off;
488	}
489	else
490	{
491	/* flag == 0 inform */
492	bc = find_addr(pData, &daddr, bp->bp_hwaddr);
493	if (bc == NULL)
494	{
495	LogRel(("NAT: DHCP Inform was ignored no boot client was found\n"));
496	return -1;
497	}
498	off = dhcp_send_ack(pData, bp, bc, m, 0);
499	return off;
500	}
501	return -1;
502	}
503
504	static int dhcp_decode_release(PNATState pData, struct bootp_t bp, const uint8_t buf, int size, int flag)
505	{
506	return -1;
507	}
508	/**
509	* fields for discovering t
510	* Field DHCPDISCOVER DHCPREQUEST DHCPDECLINE,
511	* DHCPINFORM DHCPRELEASE
512	* ----- ------------ ----------- -----------
513	* 'op' BOOTREQUEST BOOTREQUEST BOOTREQUEST
514	* 'htype' (From "Assigned Numbers" RFC)
515	* 'hlen' (Hardware address length in octets)
516	* 'hops' 0 0 0
517	* 'xid' selected by client 'xid' from server selected by
518	* DHCPOFFER message client
519	* 'secs' 0 or seconds since 0 or seconds since 0
520	* DHCP process started DHCP process started
521	* 'flags' Set 'BROADCAST' Set 'BROADCAST' 0
522	* flag if client flag if client
523	* requires broadcast requires broadcast
524	* reply reply
525	* 'ciaddr' 0 (DHCPDISCOVER) 0 or client's 0 (DHCPDECLINE)
526	* client's network address client's network
527	* network address (BOUND/RENEW/REBIND) address
528	* (DHCPINFORM) (DHCPRELEASE)
529	* 'yiaddr' 0 0 0
530	* 'siaddr' 0 0 0
531	* 'giaddr' 0 0 0
532	* 'chaddr' client's hardware client's hardware client's hardware
533	* address address address
534	* 'sname' options, if options, if (unused)
535	* indicated in indicated in
536	* 'sname/file' 'sname/file'
537	* option; otherwise option; otherwise
538	* unused unused
539	* 'file' options, if options, if (unused)
540	* indicated in indicated in
541	* 'sname/file' 'sname/file'
542	* option; otherwise option; otherwise
543	* unused unused
544	* 'options' options options (unused)
545	* Requested IP address MAY MUST (in MUST
546	* (DISCOVER) SELECTING or (DHCPDECLINE),
547	* MUST NOT INIT-REBOOT) MUST NOT
548	* (INFORM) MUST NOT (in (DHCPRELEASE)
549	* BOUND or
550	* RENEWING)
551	* IP address lease time MAY MAY MUST NOT
552	* (DISCOVER)
553	* MUST NOT
554	* (INFORM)
555	* Use 'file'/'sname' fields MAY MAY MAY
556	* DHCP message type DHCPDISCOVER/ DHCPREQUEST DHCPDECLINE/
557	* DHCPINFORM DHCPRELEASE
558	* Client identifier MAY MAY MAY
559	* Vendor class identifier MAY MAY MUST NOT
560	* Server identifier MUST NOT MUST (after MUST
561	* SELECTING)
562	* MUST NOT (after
563	* INIT-REBOOT,
564	* BOUND, RENEWING
565	* or REBINDING)
566	* Parameter request list MAY MAY MUST NOT
567	* Maximum message size MAY MAY MUST NOT
568	* Message SHOULD NOT SHOULD NOT SHOULD
569	* Site-specific MAY MAY MUST NOT
570	* All others MAY MAY MUST NOT
571	*
572	*/
573	static void dhcp_decode(PNATState pData, struct bootp_t bp, const uint8_t buf, int size)
574	{
575	const uint8_t p, p_end;
576	int rc;
577	int pmsg_type;
578	struct in_addr req_ip;
579	int flag = 0;
580	int len, tag;
581	struct mbuf *m = NULL;
582
583	pmsg_type = 0;
584
585	p = buf;
586	p_end = buf + size;
587	if (size < 5)
588	return;
589	if (memcmp(p, rfc1533_cookie, 4) != 0)
590	return;
591	p = dhcp_find_option(bp->bp_vend, RFC2132_MSG_TYPE);
592	Assert(p);
593	if (p == NULL)
594	return;
595	if ((m = m_get(pData)) == NULL)
596	{
597	LogRel(("NAT: can't alocate memory for response!\n"));
598	return;
599	}
600	switch(*(p+2))
601	{
602	case DHCPDISCOVER:
603	flag = 1;
604	/**/
605	case DHCPINFORM:
606	rc = dhcp_decode_discover(pData, bp, buf, size, flag, m);
607	if (rc > 0)
608	goto reply;
609	break;
610	case DHCPREQUEST:
611	rc = dhcp_decode_request(pData, bp, buf, size, m);
612	if (rc > 0)
613	goto reply;
614	break;
615	case DHCPRELEASE:
616	flag = 1;
617	#if 0
618	case DHCPDECLINE:
619	#endif
620	rc = dhcp_decode_release(pData, bp, buf, size, flag);
621	if (rc > 0)
622	goto reply;
623	break;
624	default:
625	AssertMsgFailed(("unsupported DHCP message type"));
626	}
627	Assert(m);
628	/silently ignore/
629	m_free(pData, m);
630	return;
631	reply:
632	bootp_reply(pData, m, rc, bp->bp_flags);
633	return;
634	}
635
636	static void bootp_reply(PNATState pData, struct mbuf *m, int off, uint16_t flags)
637	{
638	struct sockaddr_in saddr, daddr;
639	struct bootp_t *rbp = NULL;
640	uint8_t *q = NULL;
641	int nack;
642	rbp = mtod(m, struct bootp_t *);
643	Assert((m));
644	Assert((rbp));
645	q = rbp->bp_vend;
646	nack = (q[6] == DHCPNAK);
647	q += off;
648
649	#ifndef VBOX_WITH_NAT_SERVICE
650	saddr.sin_addr.s_addr = htonl(ntohl(special_addr.s_addr) \| CTL_ALIAS);
651	#else
652	saddr.sin_addr.s_addr = special_addr.s_addr;
653	#endif
654
655	FILL_BOOTP_EXT(q, RFC2132_SRV_ID, 4, &saddr.sin_addr);
656
657
658	q++ = RFC1533_END; /end of message */
659
660
661	m->m_len = sizeof(struct bootp_t)
662	- sizeof(struct ip)
663	- sizeof(struct udphdr);
664	m->m_data += sizeof(struct udphdr)
665	+ sizeof(struct ip);
666	if ((flags & DHCP_FLAGS_B) \|\| nack != 0)
667	daddr.sin_addr.s_addr = INADDR_BROADCAST;
668	else
669	daddr.sin_addr.s_addr = rbp->bp_yiaddr.s_addr; /unicast requested by client/
670	saddr.sin_port = htons(BOOTP_SERVER);
671	daddr.sin_port = htons(BOOTP_CLIENT);
672	udp_output2(pData, NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
673	}
674
675	void bootp_input(PNATState pData, struct mbuf *m)
676	{
677	struct bootp_t bp = mtod(m, struct bootp_t );
678
679	if (bp->bp_op == BOOTP_REQUEST)
680	{
681	dhcp_decode(pData, bp, bp->bp_vend, DHCP_OPT_LEN);
682	}
683	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/bootp.c@ 22315

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