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Upgraded GRUB2 to 2.00 release.
[AROS.git] / arch / all-pc / boot / grub2-aros / grub-core / net / ip.c
blob3c58d807452dbdbb45e1a17f82965f377d8e114e
1 /*
2 * GRUB -- GRand Unified Bootloader
3 * Copyright (C) 2010,2011 Free Software Foundation, Inc.
4 *
5 * GRUB is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
9 *
10 * GRUB is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19 #include <grub/net/ip.h>
20 #include <grub/misc.h>
21 #include <grub/net/arp.h>
22 #include <grub/net/udp.h>
23 #include <grub/net/ethernet.h>
24 #include <grub/net.h>
25 #include <grub/net/netbuff.h>
26 #include <grub/mm.h>
27 #include <grub/priority_queue.h>
28 #include <grub/time.h>
29
30 struct iphdr {
31 grub_uint8_t verhdrlen;
32 grub_uint8_t service;
33 grub_uint16_t len;
34 grub_uint16_t ident;
35 grub_uint16_t frags;
36 grub_uint8_t ttl;
37 grub_uint8_t protocol;
38 grub_uint16_t chksum;
39 grub_uint32_t src;
40 grub_uint32_t dest;
41 } __attribute__ ((packed)) ;
42
43 enum
44 {
45 DONT_FRAGMENT = 0x4000,
46 MORE_FRAGMENTS = 0x2000,
47 OFFSET_MASK = 0x1fff
48 };
49
50 typedef grub_uint64_t ip6addr[2];
51
52 struct ip6hdr {
53 grub_uint32_t version_class_flow;
54 grub_uint16_t len;
55 grub_uint8_t protocol;
56 grub_uint8_t ttl;
57 ip6addr src;
58 ip6addr dest;
59 } __attribute__ ((packed)) ;
60
61 static int
62 cmp (const void *a__, const void *b__)
63 {
64 struct grub_net_buff *a_ = *(struct grub_net_buff **) a__;
65 struct grub_net_buff *b_ = *(struct grub_net_buff **) b__;
66 struct iphdr *a = (struct iphdr *) a_->data;
67 struct iphdr *b = (struct iphdr *) b_->data;
68 /* We want the first elements to be on top. */
69 if ((grub_be_to_cpu16 (a->frags) & OFFSET_MASK)
70 < (grub_be_to_cpu16 (b->frags) & OFFSET_MASK))
71 return +1;
72 if ((grub_be_to_cpu16 (a->frags) & OFFSET_MASK)
73 > (grub_be_to_cpu16 (b->frags) & OFFSET_MASK))
74 return -1;
75 return 0;
76 }
77
78 struct reassemble
79 {
80 struct reassemble *next;
81 grub_uint32_t source;
82 grub_uint32_t dest;
83 grub_uint16_t id;
84 grub_uint8_t proto;
85 grub_uint64_t last_time;
86 grub_priority_queue_t pq;
87 struct grub_net_buff *asm_netbuff;
88 grub_size_t total_len;
89 grub_size_t cur_ptr;
90 grub_uint8_t ttl;
91 };
92
93 static struct reassemble *reassembles;
94
95 grub_uint16_t
96 grub_net_ip_chksum (void *ipv, grub_size_t len)
97 {
98 grub_uint16_t *ip = (grub_uint16_t *) ipv;
99 grub_uint32_t sum = 0;
100
101 for (; len >= 2; len -= 2)
102 {
103 sum += grub_be_to_cpu16 (grub_get_unaligned16 (ip++));
104 if (sum > 0xFFFF)
105 sum -= 0xFFFF;
106 }
107 if (len)
108 {
109 sum += *((grub_uint8_t *) ip) << 8;
110 if (sum > 0xFFFF)
111 sum -= 0xFFFF;
112 }
113
114 if (sum >= 0xFFFF)
115 sum -= 0xFFFF;
116
117 return grub_cpu_to_be16 ((~sum) & 0x0000FFFF);
118 }
119
120 static int id = 0x2400;
121
122 static grub_err_t
123 send_fragmented (struct grub_net_network_level_interface * inf,
124 const grub_net_network_level_address_t * target,
125 struct grub_net_buff * nb,
126 grub_net_ip_protocol_t proto,
127 grub_net_link_level_address_t ll_target_addr)
128 {
129 grub_size_t off = 0;
130 grub_size_t fraglen;
131 grub_err_t err;
132
133 fraglen = (inf->card->mtu - sizeof (struct iphdr)) & ~7;
134 id++;
135
136 while (nb->tail - nb->data)
137 {
138 grub_size_t len = fraglen;
139 struct grub_net_buff *nb2;
140 struct iphdr *iph;
141
142 if ((grub_ssize_t) len > nb->tail - nb->data)
143 len = nb->tail - nb->data;
144 nb2 = grub_netbuff_alloc (fraglen + sizeof (struct iphdr)
145 + GRUB_NET_MAX_LINK_HEADER_SIZE);
146 if (!nb2)
147 return grub_errno;
148 err = grub_netbuff_reserve (nb2, GRUB_NET_MAX_LINK_HEADER_SIZE);
149 if (err)
150 return err;
151 err = grub_netbuff_put (nb2, sizeof (struct iphdr));
152 if (err)
153 return err;
154
155 iph = (struct iphdr *) nb2->data;
156 iph->verhdrlen = ((4 << 4) | 5);
157 iph->service = 0;
158 iph->len = grub_cpu_to_be16 (len + sizeof (struct iphdr));
159 iph->ident = grub_cpu_to_be16 (id);
160 iph->frags = grub_cpu_to_be16 (off | (((grub_ssize_t) len
161 == nb->tail - nb->data)
162 ? 0 : MORE_FRAGMENTS));
163 iph->ttl = 0xff;
164 iph->protocol = proto;
165 iph->src = inf->address.ipv4;
166 iph->dest = target->ipv4;
167 off += len / 8;
168
169 iph->chksum = 0;
170 iph->chksum = grub_net_ip_chksum ((void *) nb2->data, sizeof (*iph));
171 err = grub_netbuff_put (nb2, len);
172 if (err)
173 return err;
174 grub_memcpy (iph + 1, nb->data, len);
175 err = grub_netbuff_pull (nb, len);
176 if (err)
177 return err;
178 err = send_ethernet_packet (inf, nb2, ll_target_addr,
179 GRUB_NET_ETHERTYPE_IP);
180 if (err)
181 return err;
182 }
183 return GRUB_ERR_NONE;
184 }
185
186 static grub_err_t
187 grub_net_send_ip4_packet (struct grub_net_network_level_interface *inf,
188 const grub_net_network_level_address_t *target,
189 const grub_net_link_level_address_t *ll_target_addr,
190 struct grub_net_buff *nb,
191 grub_net_ip_protocol_t proto)
192 {
193 struct iphdr *iph;
194
195 COMPILE_TIME_ASSERT (GRUB_NET_OUR_IPV4_HEADER_SIZE == sizeof (*iph));
196
197 if (nb->tail - nb->data + sizeof (struct iphdr) > inf->card->mtu)
198 return send_fragmented (inf, target, nb, proto, *ll_target_addr);
199
200 grub_netbuff_push (nb, sizeof (*iph));
201 iph = (struct iphdr *) nb->data;
202
203 iph->verhdrlen = ((4 << 4) | 5);
204 iph->service = 0;
205 iph->len = grub_cpu_to_be16 (nb->tail - nb->data);
206 iph->ident = grub_cpu_to_be16 (++id);
207 iph->frags = 0;
208 iph->ttl = 0xff;
209 iph->protocol = proto;
210 iph->src = inf->address.ipv4;
211 iph->dest = target->ipv4;
212
213 iph->chksum = 0;
214 iph->chksum = grub_net_ip_chksum ((void *) nb->data, sizeof (*iph));
215
216 return send_ethernet_packet (inf, nb, *ll_target_addr,
217 GRUB_NET_ETHERTYPE_IP);
218 }
219
220 static grub_err_t
221 handle_dgram (struct grub_net_buff *nb,
222 struct grub_net_card *card,
223 const grub_net_link_level_address_t *source_hwaddress,
224 const grub_net_link_level_address_t *hwaddress,
225 grub_net_ip_protocol_t proto,
226 const grub_net_network_level_address_t *source,
227 const grub_net_network_level_address_t *dest,
228 grub_uint8_t ttl)
229 {
230 struct grub_net_network_level_interface *inf = NULL;
231 grub_err_t err;
232 int multicast = 0;
233
234 /* DHCP needs special treatment since we don't know IP yet. */
235 {
236 struct udphdr *udph;
237 udph = (struct udphdr *) nb->data;
238 if (proto == GRUB_NET_IP_UDP && grub_be_to_cpu16 (udph->dst) == 68)
239 {
240 const struct grub_net_bootp_packet *bootp;
241 if (udph->chksum)
242 {
243 grub_uint16_t chk, expected;
244 chk = udph->chksum;
245 udph->chksum = 0;
246 expected = grub_net_ip_transport_checksum (nb,
247 GRUB_NET_IP_UDP,
248 source,
249 dest);
250 if (expected != chk)
251 {
252 grub_dprintf ("net", "Invalid UDP checksum. "
253 "Expected %x, got %x\n",
254 grub_be_to_cpu16 (expected),
255 grub_be_to_cpu16 (chk));
256 grub_netbuff_free (nb);
257 return GRUB_ERR_NONE;
258 }
259 udph->chksum = chk;
260 }
261
262 err = grub_netbuff_pull (nb, sizeof (*udph));
263 if (err)
264 {
265 grub_netbuff_free (nb);
266 return err;
267 }
268
269 bootp = (const struct grub_net_bootp_packet *) nb->data;
270
271 FOR_NET_NETWORK_LEVEL_INTERFACES (inf)
272 if (inf->card == card
273 && inf->address.type == GRUB_NET_NETWORK_LEVEL_PROTOCOL_DHCP_RECV
274 && inf->hwaddress.type == GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET
275 && grub_memcmp (inf->hwaddress.mac, &bootp->mac_addr,
276 sizeof (inf->hwaddress.mac)) == 0)
277 {
278 grub_net_process_dhcp (nb, inf->card);
279 grub_netbuff_free (nb);
280 return GRUB_ERR_NONE;
281 }
282 grub_netbuff_free (nb);
283 return GRUB_ERR_NONE;
284 }
285 }
286
287 FOR_NET_NETWORK_LEVEL_INTERFACES (inf)
288 {
289 if (inf->card == card
290 && grub_net_addr_cmp (&inf->address, dest) == 0
291 && grub_net_hwaddr_cmp (&inf->hwaddress, hwaddress) == 0)
292 break;
293 /* Solicited node multicast. */
294 if (inf->card == card
295 && inf->address.type == GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6
296 && dest->type == GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6
297 && dest->ipv6[0] == grub_be_to_cpu64_compile_time (0xff02ULL << 48)
298 && dest->ipv6[1] == (grub_be_to_cpu64_compile_time (0x01ff000000ULL)
299 | (inf->address.ipv6[1]
300 & grub_be_to_cpu64_compile_time (0xffffff)))
301 && hwaddress->type == GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET
302 && hwaddress->mac[0] == 0x33 && hwaddress->mac[1] == 0x33
303 && hwaddress->mac[2] == 0xff
304 && hwaddress->mac[3] == ((grub_be_to_cpu64 (inf->address.ipv6[1])
305 >> 16) & 0xff)
306 && hwaddress->mac[4] == ((grub_be_to_cpu64 (inf->address.ipv6[1])
307 >> 8) & 0xff)
308 && hwaddress->mac[5] == ((grub_be_to_cpu64 (inf->address.ipv6[1])
309 >> 0) & 0xff))
310 {
311 multicast = 1;
312 break;
313 }
314 }
315
316 if (!inf && !(dest->type == GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6
317 && dest->ipv6[0] == grub_be_to_cpu64_compile_time (0xff02ULL
318 << 48)
319 && dest->ipv6[1] == grub_be_to_cpu64_compile_time (1)))
320 {
321 grub_netbuff_free (nb);
322 return GRUB_ERR_NONE;
323 }
324 if (multicast)
325 inf = NULL;
326
327 switch (proto)
328 {
329 case GRUB_NET_IP_UDP:
330 return grub_net_recv_udp_packet (nb, inf, source);
331 case GRUB_NET_IP_TCP:
332 return grub_net_recv_tcp_packet (nb, inf, source);
333 case GRUB_NET_IP_ICMP:
334 return grub_net_recv_icmp_packet (nb, inf, source_hwaddress, source);
335 case GRUB_NET_IP_ICMPV6:
336 return grub_net_recv_icmp6_packet (nb, card, inf, source_hwaddress,
337 source, dest, ttl);
338 default:
339 grub_netbuff_free (nb);
340 break;
341 }
342 return GRUB_ERR_NONE;
343 }
344
345 static void
346 free_rsm (struct reassemble *rsm)
347 {
348 struct grub_net_buff **nb;
349 while ((nb = grub_priority_queue_top (rsm->pq)))
350 {
351 grub_netbuff_free (*nb);
352 grub_priority_queue_pop (rsm->pq);
353 }
354 grub_netbuff_free (rsm->asm_netbuff);
355 grub_priority_queue_destroy (rsm->pq);
356 grub_free (rsm);
357 }
358
359 static void
360 free_old_fragments (void)
361 {
362 struct reassemble *rsm, **prev;
363 grub_uint64_t limit_time = grub_get_time_ms () - 90000;
364
365 for (prev = &reassembles, rsm = *prev; rsm; rsm = *prev)
366 if (rsm->last_time < limit_time)
367 {
368 *prev = rsm->next;
369 free_rsm (rsm);
370 }
371 else
372 {
373 prev = &rsm->next;
374 }
375 }
376
377 static grub_err_t
378 grub_net_recv_ip4_packets (struct grub_net_buff *nb,
379 struct grub_net_card *card,
380 const grub_net_link_level_address_t *hwaddress,
381 const grub_net_link_level_address_t *src_hwaddress)
382 {
383 struct iphdr *iph = (struct iphdr *) nb->data;
384 grub_err_t err;
385 struct reassemble *rsm, **prev;
386
387 if ((iph->verhdrlen >> 4) != 4)
388 {
389 grub_dprintf ("net", "Bad IP version: %d\n", (iph->verhdrlen >> 4));
390 grub_netbuff_free (nb);
391 return GRUB_ERR_NONE;
392 }
393
394 if ((iph->verhdrlen & 0xf) < 5)
395 {
396 grub_dprintf ("net", "IP header too short: %d\n",
397 (iph->verhdrlen & 0xf));
398 grub_netbuff_free (nb);
399 return GRUB_ERR_NONE;
400 }
401
402 if (nb->tail - nb->data < (grub_ssize_t) ((iph->verhdrlen & 0xf)
403 * sizeof (grub_uint32_t)))
404 {
405 grub_dprintf ("net", "IP packet too short: %" PRIdGRUB_SSIZE "\n",
406 (nb->tail - nb->data));
407 grub_netbuff_free (nb);
408 return GRUB_ERR_NONE;
409 }
410
411 /* Check size. */
412 {
413 grub_size_t expected_size = grub_be_to_cpu16 (iph->len);
414 grub_size_t actual_size = (nb->tail - nb->data);
415 if (actual_size > expected_size)
416 {
417 err = grub_netbuff_unput (nb, actual_size - expected_size);
418 if (err)
419 {
420 grub_netbuff_free (nb);
421 return err;
422 }
423 }
424 if (actual_size < expected_size)
425 {
426 grub_dprintf ("net", "Cut IP packet actual: %" PRIuGRUB_SIZE
427 ", expected %" PRIuGRUB_SIZE "\n", actual_size,
428 expected_size);
429 grub_netbuff_free (nb);
430 return GRUB_ERR_NONE;
431 }
432 }
433
434 /* Unfragmented packet. Good. */
435 if (((grub_be_to_cpu16 (iph->frags) & MORE_FRAGMENTS) == 0)
436 && (grub_be_to_cpu16 (iph->frags) & OFFSET_MASK) == 0)
437 {
438 grub_net_network_level_address_t source;
439 grub_net_network_level_address_t dest;
440
441 err = grub_netbuff_pull (nb, ((iph->verhdrlen & 0xf)
442 * sizeof (grub_uint32_t)));
443 if (err)
444 {
445 grub_netbuff_free (nb);
446 return err;
447 }
448
449 source.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
450 source.ipv4 = iph->src;
451
452 dest.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
453 dest.ipv4 = iph->dest;
454
455 return handle_dgram (nb, card, src_hwaddress, hwaddress, iph->protocol,
456 &source, &dest, iph->ttl);
457 }
458
459 for (prev = &reassembles, rsm = *prev; rsm; prev = &rsm->next, rsm = *prev)
460 if (rsm->source == iph->src && rsm->dest == iph->dest
461 && rsm->id == iph->ident && rsm->proto == iph->protocol)
462 break;
463 if (!rsm)
464 {
465 rsm = grub_malloc (sizeof (*rsm));
466 if (!rsm)
467 return grub_errno;
468 rsm->source = iph->src;
469 rsm->dest = iph->dest;
470 rsm->id = iph->ident;
471 rsm->proto = iph->protocol;
472 rsm->next = reassembles;
473 reassembles = rsm;
474 prev = &reassembles;
475 rsm->pq = grub_priority_queue_new (sizeof (struct grub_net_buff **), cmp);
476 if (!rsm->pq)
477 {
478 grub_free (rsm);
479 return grub_errno;
480 }
481 rsm->asm_netbuff = 0;
482 rsm->total_len = 0;
483 rsm->cur_ptr = 0;
484 rsm->ttl = 0xff;
485 }
486 if (rsm->ttl > iph->ttl)
487 rsm->ttl = iph->ttl;
488 rsm->last_time = grub_get_time_ms ();
489 free_old_fragments ();
490
491 err = grub_priority_queue_push (rsm->pq, &nb);
492 if (err)
493 return err;
494
495 if (!(grub_be_to_cpu16 (iph->frags) & MORE_FRAGMENTS))
496 {
497 rsm->total_len = (8 * (grub_be_to_cpu16 (iph->frags) & OFFSET_MASK)
498 + (nb->tail - nb->data));
499 rsm->total_len -= ((iph->verhdrlen & 0xf) * sizeof (grub_uint32_t));
500 rsm->asm_netbuff = grub_netbuff_alloc (rsm->total_len);
501 if (!rsm->asm_netbuff)
502 {
503 *prev = rsm->next;
504 free_rsm (rsm);
505 return grub_errno;
506 }
507 }
508 if (!rsm->asm_netbuff)
509 return GRUB_ERR_NONE;
510
511 while (1)
512 {
513 struct grub_net_buff **nb_top_p, *nb_top;
514 grub_size_t copy;
515 grub_size_t res_len;
516 struct grub_net_buff *ret;
517 grub_net_ip_protocol_t proto;
518 grub_uint32_t src;
519 grub_uint32_t dst;
520 grub_net_network_level_address_t source;
521 grub_net_network_level_address_t dest;
522 grub_uint8_t ttl;
523
524 nb_top_p = grub_priority_queue_top (rsm->pq);
525 if (!nb_top_p)
526 return GRUB_ERR_NONE;
527 nb_top = *nb_top_p;
528 grub_priority_queue_pop (rsm->pq);
529 iph = (struct iphdr *) nb_top->data;
530 err = grub_netbuff_pull (nb_top, ((iph->verhdrlen & 0xf)
531 * sizeof (grub_uint32_t)));
532 if (err)
533 {
534 grub_netbuff_free (nb_top);
535 return err;
536 }
537 if (rsm->cur_ptr < (grub_size_t) 8 * (grub_be_to_cpu16 (iph->frags)
538 & OFFSET_MASK))
539 {
540 grub_netbuff_free (nb_top);
541 return GRUB_ERR_NONE;
542 }
543
544 rsm->cur_ptr = (8 * (grub_be_to_cpu16 (iph->frags) & OFFSET_MASK)
545 + (nb_top->tail - nb_top->head));
546 if ((grub_size_t) 8 * (grub_be_to_cpu16 (iph->frags) & OFFSET_MASK)
547 >= rsm->total_len)
548 {
549 grub_netbuff_free (nb_top);
550 continue;
551 }
552 copy = nb_top->tail - nb_top->data;
553 if (rsm->total_len - 8 * (grub_be_to_cpu16 (iph->frags) & OFFSET_MASK)
554 < copy)
555 copy = rsm->total_len - 8 * (grub_be_to_cpu16 (iph->frags)
556 & OFFSET_MASK);
557 grub_memcpy (&rsm->asm_netbuff->data[8 * (grub_be_to_cpu16 (iph->frags)
558 & OFFSET_MASK)],
559 nb_top->data, copy);
560
561 if ((grub_be_to_cpu16 (iph->frags) & MORE_FRAGMENTS))
562 {
563 grub_netbuff_free (nb_top);
564 continue;
565 }
566 grub_netbuff_free (nb_top);
567
568 ret = rsm->asm_netbuff;
569 proto = rsm->proto;
570 src = rsm->source;
571 dst = rsm->dest;
572 ttl = rsm->ttl;
573
574 rsm->asm_netbuff = 0;
575 res_len = rsm->total_len;
576 *prev = rsm->next;
577 free_rsm (rsm);
578
579 if (grub_netbuff_put (ret, res_len))
580 {
581 grub_netbuff_free (ret);
582 return GRUB_ERR_NONE;
583 }
584
585 source.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
586 source.ipv4 = src;
587
588 dest.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
589 dest.ipv4 = dst;
590
591 return handle_dgram (ret, card, src_hwaddress,
592 hwaddress, proto, &source, &dest,
593 ttl);
594 }
595 }
596
597 static grub_err_t
598 grub_net_send_ip6_packet (struct grub_net_network_level_interface *inf,
599 const grub_net_network_level_address_t *target,
600 const grub_net_link_level_address_t *ll_target_addr,
601 struct grub_net_buff *nb,
602 grub_net_ip_protocol_t proto)
603 {
604 struct ip6hdr *iph;
605
606 COMPILE_TIME_ASSERT (GRUB_NET_OUR_IPV6_HEADER_SIZE == sizeof (*iph));
607
608 if (nb->tail - nb->data + sizeof (struct iphdr) > inf->card->mtu)
609 return grub_error (GRUB_ERR_NET_PACKET_TOO_BIG, "packet too big");
610
611 grub_netbuff_push (nb, sizeof (*iph));
612 iph = (struct ip6hdr *) nb->data;
613
614 iph->version_class_flow = grub_cpu_to_be32 ((6 << 28));
615 iph->len = grub_cpu_to_be16 (nb->tail - nb->data - sizeof (*iph));
616 iph->protocol = proto;
617 iph->ttl = 0xff;
618 grub_memcpy (&iph->src, inf->address.ipv6, sizeof (iph->src));
619 grub_memcpy (&iph->dest, target->ipv6, sizeof (iph->dest));
620
621 return send_ethernet_packet (inf, nb, *ll_target_addr,
622 GRUB_NET_ETHERTYPE_IP6);
623 }
624
625 grub_err_t
626 grub_net_send_ip_packet (struct grub_net_network_level_interface *inf,
627 const grub_net_network_level_address_t *target,
628 const grub_net_link_level_address_t *ll_target_addr,
629 struct grub_net_buff *nb,
630 grub_net_ip_protocol_t proto)
631 {
632 switch (target->type)
633 {
634 case GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4:
635 return grub_net_send_ip4_packet (inf, target, ll_target_addr, nb, proto);
636 case GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6:
637 return grub_net_send_ip6_packet (inf, target, ll_target_addr, nb, proto);
638 default:
639 return grub_error (GRUB_ERR_BUG, "not an IP");
640 }
641 }
642
643 static grub_err_t
644 grub_net_recv_ip6_packets (struct grub_net_buff *nb,
645 struct grub_net_card *card,
646 const grub_net_link_level_address_t *hwaddress,
647 const grub_net_link_level_address_t *src_hwaddress)
648 {
649 struct ip6hdr *iph = (struct ip6hdr *) nb->data;
650 grub_err_t err;
651 grub_net_network_level_address_t source;
652 grub_net_network_level_address_t dest;
653
654 if (nb->tail - nb->data < (grub_ssize_t) sizeof (*iph))
655 {
656 grub_dprintf ("net", "IP packet too short: %" PRIdGRUB_SSIZE "\n",
657 nb->tail - nb->data);
658 grub_netbuff_free (nb);
659 return GRUB_ERR_NONE;
660 }
661
662 err = grub_netbuff_pull (nb, sizeof (*iph));
663 if (err)
664 {
665 grub_netbuff_free (nb);
666 return err;
667 }
668
669 /* Check size. */
670 {
671 grub_size_t expected_size = grub_be_to_cpu16 (iph->len);
672 grub_size_t actual_size = (nb->tail - nb->data);
673 if (actual_size > expected_size)
674 {
675 err = grub_netbuff_unput (nb, actual_size - expected_size);
676 if (err)
677 {
678 grub_netbuff_free (nb);
679 return err;
680 }
681 }
682 if (actual_size < expected_size)
683 {
684 grub_dprintf ("net", "Cut IP packet actual: %" PRIuGRUB_SIZE
685 ", expected %" PRIuGRUB_SIZE "\n", actual_size,
686 expected_size);
687 grub_netbuff_free (nb);
688 return GRUB_ERR_NONE;
689 }
690 }
691
692 source.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6;
693 dest.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6;
694 grub_memcpy (source.ipv6, &iph->src, sizeof (source.ipv6));
695 grub_memcpy (dest.ipv6, &iph->dest, sizeof (dest.ipv6));
696
697 return handle_dgram (nb, card, src_hwaddress, hwaddress, iph->protocol,
698 &source, &dest, iph->ttl);
699 }
700
701 grub_err_t
702 grub_net_recv_ip_packets (struct grub_net_buff *nb,
703 struct grub_net_card *card,
704 const grub_net_link_level_address_t *hwaddress,
705 const grub_net_link_level_address_t *src_hwaddress)
706 {
707 struct iphdr *iph = (struct iphdr *) nb->data;
708
709 if ((iph->verhdrlen >> 4) == 4)
710 return grub_net_recv_ip4_packets (nb, card, hwaddress, src_hwaddress);
711 if ((iph->verhdrlen >> 4) == 6)
712 return grub_net_recv_ip6_packets (nb, card, hwaddress, src_hwaddress);
713 grub_dprintf ("net", "Bad IP version: %d\n", (iph->verhdrlen >> 4));
714 grub_netbuff_free (nb);
715 return GRUB_ERR_NONE;
716 }
Mirror of AROS' svn.