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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * The options processing module for ip.c | |
7 | * | |
8 | * Version: $Id: ip_options.c,v 1.21 2001/09/01 00:31:50 davem Exp $ | |
9 | * | |
10 | * Authors: A.N.Kuznetsov | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/types.h> | |
16 | #include <asm/uaccess.h> | |
17 | #include <linux/skbuff.h> | |
18 | #include <linux/ip.h> | |
19 | #include <linux/icmp.h> | |
20 | #include <linux/netdevice.h> | |
21 | #include <linux/rtnetlink.h> | |
22 | #include <net/sock.h> | |
23 | #include <net/ip.h> | |
24 | #include <net/icmp.h> | |
25 | ||
26 | /* | |
27 | * Write options to IP header, record destination address to | |
28 | * source route option, address of outgoing interface | |
29 | * (we should already know it, so that this function is allowed be | |
30 | * called only after routing decision) and timestamp, | |
31 | * if we originate this datagram. | |
32 | * | |
33 | * daddr is real destination address, next hop is recorded in IP header. | |
34 | * saddr is address of outgoing interface. | |
35 | */ | |
36 | ||
37 | void ip_options_build(struct sk_buff * skb, struct ip_options * opt, | |
38 | u32 daddr, struct rtable *rt, int is_frag) | |
39 | { | |
40 | unsigned char * iph = skb->nh.raw; | |
41 | ||
42 | memcpy(&(IPCB(skb)->opt), opt, sizeof(struct ip_options)); | |
43 | memcpy(iph+sizeof(struct iphdr), opt->__data, opt->optlen); | |
44 | opt = &(IPCB(skb)->opt); | |
45 | opt->is_data = 0; | |
46 | ||
47 | if (opt->srr) | |
48 | memcpy(iph+opt->srr+iph[opt->srr+1]-4, &daddr, 4); | |
49 | ||
50 | if (!is_frag) { | |
51 | if (opt->rr_needaddr) | |
52 | ip_rt_get_source(iph+opt->rr+iph[opt->rr+2]-5, rt); | |
53 | if (opt->ts_needaddr) | |
54 | ip_rt_get_source(iph+opt->ts+iph[opt->ts+2]-9, rt); | |
55 | if (opt->ts_needtime) { | |
56 | struct timeval tv; | |
57 | __u32 midtime; | |
58 | do_gettimeofday(&tv); | |
59 | midtime = htonl((tv.tv_sec % 86400) * 1000 + tv.tv_usec / 1000); | |
60 | memcpy(iph+opt->ts+iph[opt->ts+2]-5, &midtime, 4); | |
61 | } | |
62 | return; | |
63 | } | |
64 | if (opt->rr) { | |
65 | memset(iph+opt->rr, IPOPT_NOP, iph[opt->rr+1]); | |
66 | opt->rr = 0; | |
67 | opt->rr_needaddr = 0; | |
68 | } | |
69 | if (opt->ts) { | |
70 | memset(iph+opt->ts, IPOPT_NOP, iph[opt->ts+1]); | |
71 | opt->ts = 0; | |
72 | opt->ts_needaddr = opt->ts_needtime = 0; | |
73 | } | |
74 | } | |
75 | ||
76 | /* | |
77 | * Provided (sopt, skb) points to received options, | |
78 | * build in dopt compiled option set appropriate for answering. | |
79 | * i.e. invert SRR option, copy anothers, | |
80 | * and grab room in RR/TS options. | |
81 | * | |
82 | * NOTE: dopt cannot point to skb. | |
83 | */ | |
84 | ||
85 | int ip_options_echo(struct ip_options * dopt, struct sk_buff * skb) | |
86 | { | |
87 | struct ip_options *sopt; | |
88 | unsigned char *sptr, *dptr; | |
89 | int soffset, doffset; | |
90 | int optlen; | |
91 | u32 daddr; | |
92 | ||
93 | memset(dopt, 0, sizeof(struct ip_options)); | |
94 | ||
95 | dopt->is_data = 1; | |
96 | ||
97 | sopt = &(IPCB(skb)->opt); | |
98 | ||
99 | if (sopt->optlen == 0) { | |
100 | dopt->optlen = 0; | |
101 | return 0; | |
102 | } | |
103 | ||
104 | sptr = skb->nh.raw; | |
105 | dptr = dopt->__data; | |
106 | ||
107 | if (skb->dst) | |
108 | daddr = ((struct rtable*)skb->dst)->rt_spec_dst; | |
109 | else | |
110 | daddr = skb->nh.iph->daddr; | |
111 | ||
112 | if (sopt->rr) { | |
113 | optlen = sptr[sopt->rr+1]; | |
114 | soffset = sptr[sopt->rr+2]; | |
115 | dopt->rr = dopt->optlen + sizeof(struct iphdr); | |
116 | memcpy(dptr, sptr+sopt->rr, optlen); | |
117 | if (sopt->rr_needaddr && soffset <= optlen) { | |
118 | if (soffset + 3 > optlen) | |
119 | return -EINVAL; | |
120 | dptr[2] = soffset + 4; | |
121 | dopt->rr_needaddr = 1; | |
122 | } | |
123 | dptr += optlen; | |
124 | dopt->optlen += optlen; | |
125 | } | |
126 | if (sopt->ts) { | |
127 | optlen = sptr[sopt->ts+1]; | |
128 | soffset = sptr[sopt->ts+2]; | |
129 | dopt->ts = dopt->optlen + sizeof(struct iphdr); | |
130 | memcpy(dptr, sptr+sopt->ts, optlen); | |
131 | if (soffset <= optlen) { | |
132 | if (sopt->ts_needaddr) { | |
133 | if (soffset + 3 > optlen) | |
134 | return -EINVAL; | |
135 | dopt->ts_needaddr = 1; | |
136 | soffset += 4; | |
137 | } | |
138 | if (sopt->ts_needtime) { | |
139 | if (soffset + 3 > optlen) | |
140 | return -EINVAL; | |
141 | if ((dptr[3]&0xF) != IPOPT_TS_PRESPEC) { | |
142 | dopt->ts_needtime = 1; | |
143 | soffset += 4; | |
144 | } else { | |
145 | dopt->ts_needtime = 0; | |
146 | ||
147 | if (soffset + 8 <= optlen) { | |
148 | __u32 addr; | |
149 | ||
150 | memcpy(&addr, sptr+soffset-1, 4); | |
151 | if (inet_addr_type(addr) != RTN_LOCAL) { | |
152 | dopt->ts_needtime = 1; | |
153 | soffset += 8; | |
154 | } | |
155 | } | |
156 | } | |
157 | } | |
158 | dptr[2] = soffset; | |
159 | } | |
160 | dptr += optlen; | |
161 | dopt->optlen += optlen; | |
162 | } | |
163 | if (sopt->srr) { | |
164 | unsigned char * start = sptr+sopt->srr; | |
165 | u32 faddr; | |
166 | ||
167 | optlen = start[1]; | |
168 | soffset = start[2]; | |
169 | doffset = 0; | |
170 | if (soffset > optlen) | |
171 | soffset = optlen + 1; | |
172 | soffset -= 4; | |
173 | if (soffset > 3) { | |
174 | memcpy(&faddr, &start[soffset-1], 4); | |
175 | for (soffset-=4, doffset=4; soffset > 3; soffset-=4, doffset+=4) | |
176 | memcpy(&dptr[doffset-1], &start[soffset-1], 4); | |
177 | /* | |
178 | * RFC1812 requires to fix illegal source routes. | |
179 | */ | |
180 | if (memcmp(&skb->nh.iph->saddr, &start[soffset+3], 4) == 0) | |
181 | doffset -= 4; | |
182 | } | |
183 | if (doffset > 3) { | |
184 | memcpy(&start[doffset-1], &daddr, 4); | |
185 | dopt->faddr = faddr; | |
186 | dptr[0] = start[0]; | |
187 | dptr[1] = doffset+3; | |
188 | dptr[2] = 4; | |
189 | dptr += doffset+3; | |
190 | dopt->srr = dopt->optlen + sizeof(struct iphdr); | |
191 | dopt->optlen += doffset+3; | |
192 | dopt->is_strictroute = sopt->is_strictroute; | |
193 | } | |
194 | } | |
195 | while (dopt->optlen & 3) { | |
196 | *dptr++ = IPOPT_END; | |
197 | dopt->optlen++; | |
198 | } | |
199 | return 0; | |
200 | } | |
201 | ||
202 | /* | |
203 | * Options "fragmenting", just fill options not | |
204 | * allowed in fragments with NOOPs. | |
205 | * Simple and stupid 8), but the most efficient way. | |
206 | */ | |
207 | ||
208 | void ip_options_fragment(struct sk_buff * skb) | |
209 | { | |
210 | unsigned char * optptr = skb->nh.raw; | |
211 | struct ip_options * opt = &(IPCB(skb)->opt); | |
212 | int l = opt->optlen; | |
213 | int optlen; | |
214 | ||
215 | while (l > 0) { | |
216 | switch (*optptr) { | |
217 | case IPOPT_END: | |
218 | return; | |
219 | case IPOPT_NOOP: | |
220 | l--; | |
221 | optptr++; | |
222 | continue; | |
223 | } | |
224 | optlen = optptr[1]; | |
225 | if (optlen<2 || optlen>l) | |
226 | return; | |
227 | if (!IPOPT_COPIED(*optptr)) | |
228 | memset(optptr, IPOPT_NOOP, optlen); | |
229 | l -= optlen; | |
230 | optptr += optlen; | |
231 | } | |
232 | opt->ts = 0; | |
233 | opt->rr = 0; | |
234 | opt->rr_needaddr = 0; | |
235 | opt->ts_needaddr = 0; | |
236 | opt->ts_needtime = 0; | |
237 | return; | |
238 | } | |
239 | ||
240 | /* | |
241 | * Verify options and fill pointers in struct options. | |
242 | * Caller should clear *opt, and set opt->data. | |
243 | * If opt == NULL, then skb->data should point to IP header. | |
244 | */ | |
245 | ||
246 | int ip_options_compile(struct ip_options * opt, struct sk_buff * skb) | |
247 | { | |
248 | int l; | |
249 | unsigned char * iph; | |
250 | unsigned char * optptr; | |
251 | int optlen; | |
252 | unsigned char * pp_ptr = NULL; | |
253 | struct rtable *rt = skb ? (struct rtable*)skb->dst : NULL; | |
254 | ||
255 | if (!opt) { | |
256 | opt = &(IPCB(skb)->opt); | |
257 | memset(opt, 0, sizeof(struct ip_options)); | |
258 | iph = skb->nh.raw; | |
259 | opt->optlen = ((struct iphdr *)iph)->ihl*4 - sizeof(struct iphdr); | |
260 | optptr = iph + sizeof(struct iphdr); | |
261 | opt->is_data = 0; | |
262 | } else { | |
263 | optptr = opt->is_data ? opt->__data : (unsigned char*)&(skb->nh.iph[1]); | |
264 | iph = optptr - sizeof(struct iphdr); | |
265 | } | |
266 | ||
267 | for (l = opt->optlen; l > 0; ) { | |
268 | switch (*optptr) { | |
269 | case IPOPT_END: | |
270 | for (optptr++, l--; l>0; optptr++, l--) { | |
271 | if (*optptr != IPOPT_END) { | |
272 | *optptr = IPOPT_END; | |
273 | opt->is_changed = 1; | |
274 | } | |
275 | } | |
276 | goto eol; | |
277 | case IPOPT_NOOP: | |
278 | l--; | |
279 | optptr++; | |
280 | continue; | |
281 | } | |
282 | optlen = optptr[1]; | |
283 | if (optlen<2 || optlen>l) { | |
284 | pp_ptr = optptr; | |
285 | goto error; | |
286 | } | |
287 | switch (*optptr) { | |
288 | case IPOPT_SSRR: | |
289 | case IPOPT_LSRR: | |
290 | if (optlen < 3) { | |
291 | pp_ptr = optptr + 1; | |
292 | goto error; | |
293 | } | |
294 | if (optptr[2] < 4) { | |
295 | pp_ptr = optptr + 2; | |
296 | goto error; | |
297 | } | |
298 | /* NB: cf RFC-1812 5.2.4.1 */ | |
299 | if (opt->srr) { | |
300 | pp_ptr = optptr; | |
301 | goto error; | |
302 | } | |
303 | if (!skb) { | |
304 | if (optptr[2] != 4 || optlen < 7 || ((optlen-3) & 3)) { | |
305 | pp_ptr = optptr + 1; | |
306 | goto error; | |
307 | } | |
308 | memcpy(&opt->faddr, &optptr[3], 4); | |
309 | if (optlen > 7) | |
310 | memmove(&optptr[3], &optptr[7], optlen-7); | |
311 | } | |
312 | opt->is_strictroute = (optptr[0] == IPOPT_SSRR); | |
313 | opt->srr = optptr - iph; | |
314 | break; | |
315 | case IPOPT_RR: | |
316 | if (opt->rr) { | |
317 | pp_ptr = optptr; | |
318 | goto error; | |
319 | } | |
320 | if (optlen < 3) { | |
321 | pp_ptr = optptr + 1; | |
322 | goto error; | |
323 | } | |
324 | if (optptr[2] < 4) { | |
325 | pp_ptr = optptr + 2; | |
326 | goto error; | |
327 | } | |
328 | if (optptr[2] <= optlen) { | |
329 | if (optptr[2]+3 > optlen) { | |
330 | pp_ptr = optptr + 2; | |
331 | goto error; | |
332 | } | |
333 | if (skb) { | |
334 | memcpy(&optptr[optptr[2]-1], &rt->rt_spec_dst, 4); | |
335 | opt->is_changed = 1; | |
336 | } | |
337 | optptr[2] += 4; | |
338 | opt->rr_needaddr = 1; | |
339 | } | |
340 | opt->rr = optptr - iph; | |
341 | break; | |
342 | case IPOPT_TIMESTAMP: | |
343 | if (opt->ts) { | |
344 | pp_ptr = optptr; | |
345 | goto error; | |
346 | } | |
347 | if (optlen < 4) { | |
348 | pp_ptr = optptr + 1; | |
349 | goto error; | |
350 | } | |
351 | if (optptr[2] < 5) { | |
352 | pp_ptr = optptr + 2; | |
353 | goto error; | |
354 | } | |
355 | if (optptr[2] <= optlen) { | |
356 | __u32 * timeptr = NULL; | |
357 | if (optptr[2]+3 > optptr[1]) { | |
358 | pp_ptr = optptr + 2; | |
359 | goto error; | |
360 | } | |
361 | switch (optptr[3]&0xF) { | |
362 | case IPOPT_TS_TSONLY: | |
363 | opt->ts = optptr - iph; | |
364 | if (skb) | |
365 | timeptr = (__u32*)&optptr[optptr[2]-1]; | |
366 | opt->ts_needtime = 1; | |
367 | optptr[2] += 4; | |
368 | break; | |
369 | case IPOPT_TS_TSANDADDR: | |
370 | if (optptr[2]+7 > optptr[1]) { | |
371 | pp_ptr = optptr + 2; | |
372 | goto error; | |
373 | } | |
374 | opt->ts = optptr - iph; | |
375 | if (skb) { | |
376 | memcpy(&optptr[optptr[2]-1], &rt->rt_spec_dst, 4); | |
377 | timeptr = (__u32*)&optptr[optptr[2]+3]; | |
378 | } | |
379 | opt->ts_needaddr = 1; | |
380 | opt->ts_needtime = 1; | |
381 | optptr[2] += 8; | |
382 | break; | |
383 | case IPOPT_TS_PRESPEC: | |
384 | if (optptr[2]+7 > optptr[1]) { | |
385 | pp_ptr = optptr + 2; | |
386 | goto error; | |
387 | } | |
388 | opt->ts = optptr - iph; | |
389 | { | |
390 | u32 addr; | |
391 | memcpy(&addr, &optptr[optptr[2]-1], 4); | |
392 | if (inet_addr_type(addr) == RTN_UNICAST) | |
393 | break; | |
394 | if (skb) | |
395 | timeptr = (__u32*)&optptr[optptr[2]+3]; | |
396 | } | |
397 | opt->ts_needtime = 1; | |
398 | optptr[2] += 8; | |
399 | break; | |
400 | default: | |
401 | if (!skb && !capable(CAP_NET_RAW)) { | |
402 | pp_ptr = optptr + 3; | |
403 | goto error; | |
404 | } | |
405 | break; | |
406 | } | |
407 | if (timeptr) { | |
408 | struct timeval tv; | |
409 | __u32 midtime; | |
410 | do_gettimeofday(&tv); | |
411 | midtime = htonl((tv.tv_sec % 86400) * 1000 + tv.tv_usec / 1000); | |
412 | memcpy(timeptr, &midtime, sizeof(__u32)); | |
413 | opt->is_changed = 1; | |
414 | } | |
415 | } else { | |
416 | unsigned overflow = optptr[3]>>4; | |
417 | if (overflow == 15) { | |
418 | pp_ptr = optptr + 3; | |
419 | goto error; | |
420 | } | |
421 | opt->ts = optptr - iph; | |
422 | if (skb) { | |
423 | optptr[3] = (optptr[3]&0xF)|((overflow+1)<<4); | |
424 | opt->is_changed = 1; | |
425 | } | |
426 | } | |
427 | break; | |
428 | case IPOPT_RA: | |
429 | if (optlen < 4) { | |
430 | pp_ptr = optptr + 1; | |
431 | goto error; | |
432 | } | |
433 | if (optptr[2] == 0 && optptr[3] == 0) | |
434 | opt->router_alert = optptr - iph; | |
435 | break; | |
436 | case IPOPT_SEC: | |
437 | case IPOPT_SID: | |
438 | default: | |
439 | if (!skb && !capable(CAP_NET_RAW)) { | |
440 | pp_ptr = optptr; | |
441 | goto error; | |
442 | } | |
443 | break; | |
444 | } | |
445 | l -= optlen; | |
446 | optptr += optlen; | |
447 | } | |
448 | ||
449 | eol: | |
450 | if (!pp_ptr) | |
451 | return 0; | |
452 | ||
453 | error: | |
454 | if (skb) { | |
455 | icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl((pp_ptr-iph)<<24)); | |
456 | } | |
457 | return -EINVAL; | |
458 | } | |
459 | ||
460 | ||
461 | /* | |
462 | * Undo all the changes done by ip_options_compile(). | |
463 | */ | |
464 | ||
465 | void ip_options_undo(struct ip_options * opt) | |
466 | { | |
467 | if (opt->srr) { | |
468 | unsigned char * optptr = opt->__data+opt->srr-sizeof(struct iphdr); | |
469 | memmove(optptr+7, optptr+3, optptr[1]-7); | |
470 | memcpy(optptr+3, &opt->faddr, 4); | |
471 | } | |
472 | if (opt->rr_needaddr) { | |
473 | unsigned char * optptr = opt->__data+opt->rr-sizeof(struct iphdr); | |
474 | optptr[2] -= 4; | |
475 | memset(&optptr[optptr[2]-1], 0, 4); | |
476 | } | |
477 | if (opt->ts) { | |
478 | unsigned char * optptr = opt->__data+opt->ts-sizeof(struct iphdr); | |
479 | if (opt->ts_needtime) { | |
480 | optptr[2] -= 4; | |
481 | memset(&optptr[optptr[2]-1], 0, 4); | |
482 | if ((optptr[3]&0xF) == IPOPT_TS_PRESPEC) | |
483 | optptr[2] -= 4; | |
484 | } | |
485 | if (opt->ts_needaddr) { | |
486 | optptr[2] -= 4; | |
487 | memset(&optptr[optptr[2]-1], 0, 4); | |
488 | } | |
489 | } | |
490 | } | |
491 | ||
492 | int ip_options_get(struct ip_options **optp, unsigned char *data, int optlen, int user) | |
493 | { | |
494 | struct ip_options *opt; | |
495 | ||
496 | opt = kmalloc(sizeof(struct ip_options)+((optlen+3)&~3), GFP_KERNEL); | |
497 | if (!opt) | |
498 | return -ENOMEM; | |
499 | memset(opt, 0, sizeof(struct ip_options)); | |
500 | if (optlen) { | |
501 | if (user) { | |
502 | if (copy_from_user(opt->__data, data, optlen)) { | |
503 | kfree(opt); | |
504 | return -EFAULT; | |
505 | } | |
506 | } else | |
507 | memcpy(opt->__data, data, optlen); | |
508 | } | |
509 | while (optlen & 3) | |
510 | opt->__data[optlen++] = IPOPT_END; | |
511 | opt->optlen = optlen; | |
512 | opt->is_data = 1; | |
513 | opt->is_setbyuser = 1; | |
514 | if (optlen && ip_options_compile(opt, NULL)) { | |
515 | kfree(opt); | |
516 | return -EINVAL; | |
517 | } | |
518 | if (*optp) | |
519 | kfree(*optp); | |
520 | *optp = opt; | |
521 | return 0; | |
522 | } | |
523 | ||
524 | void ip_forward_options(struct sk_buff *skb) | |
525 | { | |
526 | struct ip_options * opt = &(IPCB(skb)->opt); | |
527 | unsigned char * optptr; | |
528 | struct rtable *rt = (struct rtable*)skb->dst; | |
529 | unsigned char *raw = skb->nh.raw; | |
530 | ||
531 | if (opt->rr_needaddr) { | |
532 | optptr = (unsigned char *)raw + opt->rr; | |
533 | ip_rt_get_source(&optptr[optptr[2]-5], rt); | |
534 | opt->is_changed = 1; | |
535 | } | |
536 | if (opt->srr_is_hit) { | |
537 | int srrptr, srrspace; | |
538 | ||
539 | optptr = raw + opt->srr; | |
540 | ||
541 | for ( srrptr=optptr[2], srrspace = optptr[1]; | |
542 | srrptr <= srrspace; | |
543 | srrptr += 4 | |
544 | ) { | |
545 | if (srrptr + 3 > srrspace) | |
546 | break; | |
547 | if (memcmp(&rt->rt_dst, &optptr[srrptr-1], 4) == 0) | |
548 | break; | |
549 | } | |
550 | if (srrptr + 3 <= srrspace) { | |
551 | opt->is_changed = 1; | |
552 | ip_rt_get_source(&optptr[srrptr-1], rt); | |
553 | skb->nh.iph->daddr = rt->rt_dst; | |
554 | optptr[2] = srrptr+4; | |
555 | } else if (net_ratelimit()) | |
556 | printk(KERN_CRIT "ip_forward(): Argh! Destination lost!\n"); | |
557 | if (opt->ts_needaddr) { | |
558 | optptr = raw + opt->ts; | |
559 | ip_rt_get_source(&optptr[optptr[2]-9], rt); | |
560 | opt->is_changed = 1; | |
561 | } | |
562 | } | |
563 | if (opt->is_changed) { | |
564 | opt->is_changed = 0; | |
565 | ip_send_check(skb->nh.iph); | |
566 | } | |
567 | } | |
568 | ||
569 | int ip_options_rcv_srr(struct sk_buff *skb) | |
570 | { | |
571 | struct ip_options *opt = &(IPCB(skb)->opt); | |
572 | int srrspace, srrptr; | |
573 | u32 nexthop; | |
574 | struct iphdr *iph = skb->nh.iph; | |
575 | unsigned char * optptr = skb->nh.raw + opt->srr; | |
576 | struct rtable *rt = (struct rtable*)skb->dst; | |
577 | struct rtable *rt2; | |
578 | int err; | |
579 | ||
580 | if (!opt->srr) | |
581 | return 0; | |
582 | ||
583 | if (skb->pkt_type != PACKET_HOST) | |
584 | return -EINVAL; | |
585 | if (rt->rt_type == RTN_UNICAST) { | |
586 | if (!opt->is_strictroute) | |
587 | return 0; | |
588 | icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl(16<<24)); | |
589 | return -EINVAL; | |
590 | } | |
591 | if (rt->rt_type != RTN_LOCAL) | |
592 | return -EINVAL; | |
593 | ||
594 | for (srrptr=optptr[2], srrspace = optptr[1]; srrptr <= srrspace; srrptr += 4) { | |
595 | if (srrptr + 3 > srrspace) { | |
596 | icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl((opt->srr+2)<<24)); | |
597 | return -EINVAL; | |
598 | } | |
599 | memcpy(&nexthop, &optptr[srrptr-1], 4); | |
600 | ||
601 | rt = (struct rtable*)skb->dst; | |
602 | skb->dst = NULL; | |
603 | err = ip_route_input(skb, nexthop, iph->saddr, iph->tos, skb->dev); | |
604 | rt2 = (struct rtable*)skb->dst; | |
605 | if (err || (rt2->rt_type != RTN_UNICAST && rt2->rt_type != RTN_LOCAL)) { | |
606 | ip_rt_put(rt2); | |
607 | skb->dst = &rt->u.dst; | |
608 | return -EINVAL; | |
609 | } | |
610 | ip_rt_put(rt); | |
611 | if (rt2->rt_type != RTN_LOCAL) | |
612 | break; | |
613 | /* Superfast 8) loopback forward */ | |
614 | memcpy(&iph->daddr, &optptr[srrptr-1], 4); | |
615 | opt->is_changed = 1; | |
616 | } | |
617 | if (srrptr <= srrspace) { | |
618 | opt->srr_is_hit = 1; | |
619 | opt->is_changed = 1; | |
620 | } | |
621 | return 0; | |
622 | } |