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Commit | Line | Data |
---|---|---|
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 | * | |
1da177e4 | 8 | * Authors: A.N.Kuznetsov |
e905a9ed | 9 | * |
1da177e4 LT |
10 | */ |
11 | ||
afd46503 JP |
12 | #define pr_fmt(fmt) "IPv4: " fmt |
13 | ||
4fc268d2 | 14 | #include <linux/capability.h> |
1da177e4 | 15 | #include <linux/module.h> |
5a0e3ad6 | 16 | #include <linux/slab.h> |
1da177e4 LT |
17 | #include <linux/types.h> |
18 | #include <asm/uaccess.h> | |
48bdf072 | 19 | #include <asm/unaligned.h> |
1da177e4 LT |
20 | #include <linux/skbuff.h> |
21 | #include <linux/ip.h> | |
22 | #include <linux/icmp.h> | |
23 | #include <linux/netdevice.h> | |
24 | #include <linux/rtnetlink.h> | |
25 | #include <net/sock.h> | |
26 | #include <net/ip.h> | |
27 | #include <net/icmp.h> | |
14c85021 | 28 | #include <net/route.h> |
11a03f78 | 29 | #include <net/cipso_ipv4.h> |
1da177e4 | 30 | |
e905a9ed | 31 | /* |
1da177e4 LT |
32 | * Write options to IP header, record destination address to |
33 | * source route option, address of outgoing interface | |
34 | * (we should already know it, so that this function is allowed be | |
35 | * called only after routing decision) and timestamp, | |
36 | * if we originate this datagram. | |
37 | * | |
38 | * daddr is real destination address, next hop is recorded in IP header. | |
39 | * saddr is address of outgoing interface. | |
40 | */ | |
41 | ||
f6d8bd05 | 42 | void ip_options_build(struct sk_buff *skb, struct ip_options *opt, |
8e36360a | 43 | __be32 daddr, struct rtable *rt, int is_frag) |
1da177e4 | 44 | { |
d56f90a7 | 45 | unsigned char *iph = skb_network_header(skb); |
1da177e4 LT |
46 | |
47 | memcpy(&(IPCB(skb)->opt), opt, sizeof(struct ip_options)); | |
48 | memcpy(iph+sizeof(struct iphdr), opt->__data, opt->optlen); | |
49 | opt = &(IPCB(skb)->opt); | |
1da177e4 LT |
50 | |
51 | if (opt->srr) | |
52 | memcpy(iph+opt->srr+iph[opt->srr+1]-4, &daddr, 4); | |
53 | ||
54 | if (!is_frag) { | |
55 | if (opt->rr_needaddr) | |
8e36360a | 56 | ip_rt_get_source(iph+opt->rr+iph[opt->rr+2]-5, skb, rt); |
1da177e4 | 57 | if (opt->ts_needaddr) |
8e36360a | 58 | ip_rt_get_source(iph+opt->ts+iph[opt->ts+2]-9, skb, rt); |
1da177e4 | 59 | if (opt->ts_needtime) { |
f25c3d61 | 60 | struct timespec tv; |
e25d2ca6 | 61 | __be32 midtime; |
f25c3d61 YH |
62 | getnstimeofday(&tv); |
63 | midtime = htonl((tv.tv_sec % 86400) * MSEC_PER_SEC + tv.tv_nsec / NSEC_PER_MSEC); | |
1da177e4 LT |
64 | memcpy(iph+opt->ts+iph[opt->ts+2]-5, &midtime, 4); |
65 | } | |
66 | return; | |
67 | } | |
68 | if (opt->rr) { | |
69 | memset(iph+opt->rr, IPOPT_NOP, iph[opt->rr+1]); | |
70 | opt->rr = 0; | |
71 | opt->rr_needaddr = 0; | |
72 | } | |
73 | if (opt->ts) { | |
74 | memset(iph+opt->ts, IPOPT_NOP, iph[opt->ts+1]); | |
75 | opt->ts = 0; | |
76 | opt->ts_needaddr = opt->ts_needtime = 0; | |
77 | } | |
78 | } | |
79 | ||
e905a9ed | 80 | /* |
1da177e4 LT |
81 | * Provided (sopt, skb) points to received options, |
82 | * build in dopt compiled option set appropriate for answering. | |
83 | * i.e. invert SRR option, copy anothers, | |
84 | * and grab room in RR/TS options. | |
85 | * | |
86 | * NOTE: dopt cannot point to skb. | |
87 | */ | |
88 | ||
f6d8bd05 | 89 | int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb) |
1da177e4 | 90 | { |
f6d8bd05 | 91 | const struct ip_options *sopt; |
1da177e4 LT |
92 | unsigned char *sptr, *dptr; |
93 | int soffset, doffset; | |
94 | int optlen; | |
e25d2ca6 | 95 | __be32 daddr; |
1da177e4 LT |
96 | |
97 | memset(dopt, 0, sizeof(struct ip_options)); | |
98 | ||
1da177e4 LT |
99 | sopt = &(IPCB(skb)->opt); |
100 | ||
f6d8bd05 | 101 | if (sopt->optlen == 0) |
1da177e4 | 102 | return 0; |
1da177e4 | 103 | |
d56f90a7 | 104 | sptr = skb_network_header(skb); |
1da177e4 LT |
105 | dptr = dopt->__data; |
106 | ||
511c3f92 | 107 | daddr = skb_rtable(skb)->rt_spec_dst; |
1da177e4 LT |
108 | |
109 | if (sopt->rr) { | |
110 | optlen = sptr[sopt->rr+1]; | |
111 | soffset = sptr[sopt->rr+2]; | |
112 | dopt->rr = dopt->optlen + sizeof(struct iphdr); | |
113 | memcpy(dptr, sptr+sopt->rr, optlen); | |
114 | if (sopt->rr_needaddr && soffset <= optlen) { | |
115 | if (soffset + 3 > optlen) | |
116 | return -EINVAL; | |
117 | dptr[2] = soffset + 4; | |
118 | dopt->rr_needaddr = 1; | |
119 | } | |
120 | dptr += optlen; | |
121 | dopt->optlen += optlen; | |
122 | } | |
123 | if (sopt->ts) { | |
124 | optlen = sptr[sopt->ts+1]; | |
125 | soffset = sptr[sopt->ts+2]; | |
126 | dopt->ts = dopt->optlen + sizeof(struct iphdr); | |
127 | memcpy(dptr, sptr+sopt->ts, optlen); | |
128 | if (soffset <= optlen) { | |
129 | if (sopt->ts_needaddr) { | |
130 | if (soffset + 3 > optlen) | |
131 | return -EINVAL; | |
132 | dopt->ts_needaddr = 1; | |
133 | soffset += 4; | |
134 | } | |
135 | if (sopt->ts_needtime) { | |
136 | if (soffset + 3 > optlen) | |
137 | return -EINVAL; | |
138 | if ((dptr[3]&0xF) != IPOPT_TS_PRESPEC) { | |
139 | dopt->ts_needtime = 1; | |
140 | soffset += 4; | |
141 | } else { | |
142 | dopt->ts_needtime = 0; | |
143 | ||
8628bd8a | 144 | if (soffset + 7 <= optlen) { |
fd683222 | 145 | __be32 addr; |
1da177e4 | 146 | |
8628bd8a JL |
147 | memcpy(&addr, dptr+soffset-1, 4); |
148 | if (inet_addr_type(dev_net(skb_dst(skb)->dev), addr) != RTN_UNICAST) { | |
1da177e4 LT |
149 | dopt->ts_needtime = 1; |
150 | soffset += 8; | |
151 | } | |
152 | } | |
153 | } | |
154 | } | |
155 | dptr[2] = soffset; | |
156 | } | |
157 | dptr += optlen; | |
158 | dopt->optlen += optlen; | |
159 | } | |
160 | if (sopt->srr) { | |
f6d8bd05 | 161 | unsigned char *start = sptr+sopt->srr; |
3ca3c68e | 162 | __be32 faddr; |
1da177e4 LT |
163 | |
164 | optlen = start[1]; | |
165 | soffset = start[2]; | |
166 | doffset = 0; | |
167 | if (soffset > optlen) | |
168 | soffset = optlen + 1; | |
169 | soffset -= 4; | |
170 | if (soffset > 3) { | |
171 | memcpy(&faddr, &start[soffset-1], 4); | |
172 | for (soffset-=4, doffset=4; soffset > 3; soffset-=4, doffset+=4) | |
173 | memcpy(&dptr[doffset-1], &start[soffset-1], 4); | |
174 | /* | |
175 | * RFC1812 requires to fix illegal source routes. | |
176 | */ | |
eddc9ec5 ACM |
177 | if (memcmp(&ip_hdr(skb)->saddr, |
178 | &start[soffset + 3], 4) == 0) | |
1da177e4 LT |
179 | doffset -= 4; |
180 | } | |
181 | if (doffset > 3) { | |
182 | memcpy(&start[doffset-1], &daddr, 4); | |
183 | dopt->faddr = faddr; | |
184 | dptr[0] = start[0]; | |
185 | dptr[1] = doffset+3; | |
186 | dptr[2] = 4; | |
187 | dptr += doffset+3; | |
188 | dopt->srr = dopt->optlen + sizeof(struct iphdr); | |
189 | dopt->optlen += doffset+3; | |
190 | dopt->is_strictroute = sopt->is_strictroute; | |
191 | } | |
192 | } | |
11a03f78 PM |
193 | if (sopt->cipso) { |
194 | optlen = sptr[sopt->cipso+1]; | |
195 | dopt->cipso = dopt->optlen+sizeof(struct iphdr); | |
196 | memcpy(dptr, sptr+sopt->cipso, optlen); | |
197 | dptr += optlen; | |
198 | dopt->optlen += optlen; | |
199 | } | |
1da177e4 LT |
200 | while (dopt->optlen & 3) { |
201 | *dptr++ = IPOPT_END; | |
202 | dopt->optlen++; | |
203 | } | |
204 | return 0; | |
205 | } | |
206 | ||
207 | /* | |
208 | * Options "fragmenting", just fill options not | |
209 | * allowed in fragments with NOOPs. | |
210 | * Simple and stupid 8), but the most efficient way. | |
211 | */ | |
212 | ||
5e73ea1a | 213 | void ip_options_fragment(struct sk_buff *skb) |
1da177e4 | 214 | { |
d56f90a7 | 215 | unsigned char *optptr = skb_network_header(skb) + sizeof(struct iphdr); |
5e73ea1a | 216 | struct ip_options *opt = &(IPCB(skb)->opt); |
1da177e4 LT |
217 | int l = opt->optlen; |
218 | int optlen; | |
219 | ||
220 | while (l > 0) { | |
221 | switch (*optptr) { | |
222 | case IPOPT_END: | |
223 | return; | |
224 | case IPOPT_NOOP: | |
225 | l--; | |
226 | optptr++; | |
227 | continue; | |
228 | } | |
229 | optlen = optptr[1]; | |
230 | if (optlen<2 || optlen>l) | |
231 | return; | |
232 | if (!IPOPT_COPIED(*optptr)) | |
233 | memset(optptr, IPOPT_NOOP, optlen); | |
234 | l -= optlen; | |
235 | optptr += optlen; | |
236 | } | |
237 | opt->ts = 0; | |
238 | opt->rr = 0; | |
239 | opt->rr_needaddr = 0; | |
240 | opt->ts_needaddr = 0; | |
241 | opt->ts_needtime = 0; | |
1da177e4 LT |
242 | } |
243 | ||
244 | /* | |
245 | * Verify options and fill pointers in struct options. | |
246 | * Caller should clear *opt, and set opt->data. | |
247 | * If opt == NULL, then skb->data should point to IP header. | |
248 | */ | |
249 | ||
0e6bd4a1 | 250 | int ip_options_compile(struct net *net, |
5e73ea1a | 251 | struct ip_options *opt, struct sk_buff *skb) |
1da177e4 LT |
252 | { |
253 | int l; | |
5e73ea1a DB |
254 | unsigned char *iph; |
255 | unsigned char *optptr; | |
1da177e4 | 256 | int optlen; |
5e73ea1a | 257 | unsigned char *pp_ptr = NULL; |
22aba383 | 258 | struct rtable *rt = NULL; |
1da177e4 | 259 | |
22aba383 | 260 | if (skb != NULL) { |
511c3f92 | 261 | rt = skb_rtable(skb); |
22aba383 DL |
262 | optptr = (unsigned char *)&(ip_hdr(skb)[1]); |
263 | } else | |
10fe7d85 | 264 | optptr = opt->__data; |
22aba383 | 265 | iph = optptr - sizeof(struct iphdr); |
1da177e4 LT |
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 | } | |
c65353da | 333 | if (rt) { |
1da177e4 LT |
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) { | |
48bdf072 | 356 | unsigned char *timeptr = NULL; |
1da177e4 LT |
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; | |
e905a9ed | 364 | if (skb) |
48bdf072 | 365 | timeptr = &optptr[optptr[2]-1]; |
1da177e4 LT |
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; | |
c65353da | 375 | if (rt) { |
1da177e4 | 376 | memcpy(&optptr[optptr[2]-1], &rt->rt_spec_dst, 4); |
48bdf072 | 377 | timeptr = &optptr[optptr[2]+3]; |
1da177e4 LT |
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 | { | |
fd683222 | 390 | __be32 addr; |
1da177e4 | 391 | memcpy(&addr, &optptr[optptr[2]-1], 4); |
0e6bd4a1 | 392 | if (inet_addr_type(net, addr) == RTN_UNICAST) |
1da177e4 LT |
393 | break; |
394 | if (skb) | |
48bdf072 | 395 | timeptr = &optptr[optptr[2]+3]; |
1da177e4 LT |
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) { | |
f25c3d61 | 408 | struct timespec tv; |
48bdf072 | 409 | u32 midtime; |
f25c3d61 | 410 | getnstimeofday(&tv); |
48bdf072 CM |
411 | midtime = (tv.tv_sec % 86400) * MSEC_PER_SEC + tv.tv_nsec / NSEC_PER_MSEC; |
412 | put_unaligned_be32(midtime, timeptr); | |
1da177e4 LT |
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; | |
11a03f78 | 436 | case IPOPT_CIPSO: |
f8687afe | 437 | if ((!skb && !capable(CAP_NET_RAW)) || opt->cipso) { |
11a03f78 PM |
438 | pp_ptr = optptr; |
439 | goto error; | |
440 | } | |
441 | opt->cipso = optptr - iph; | |
15c45f7b | 442 | if (cipso_v4_validate(skb, &optptr)) { |
11a03f78 PM |
443 | pp_ptr = optptr; |
444 | goto error; | |
445 | } | |
446 | break; | |
1da177e4 LT |
447 | case IPOPT_SEC: |
448 | case IPOPT_SID: | |
449 | default: | |
450 | if (!skb && !capable(CAP_NET_RAW)) { | |
451 | pp_ptr = optptr; | |
452 | goto error; | |
453 | } | |
454 | break; | |
455 | } | |
456 | l -= optlen; | |
457 | optptr += optlen; | |
458 | } | |
459 | ||
460 | eol: | |
461 | if (!pp_ptr) | |
462 | return 0; | |
463 | ||
464 | error: | |
465 | if (skb) { | |
466 | icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl((pp_ptr-iph)<<24)); | |
467 | } | |
468 | return -EINVAL; | |
469 | } | |
462fb2af | 470 | EXPORT_SYMBOL(ip_options_compile); |
1da177e4 LT |
471 | |
472 | /* | |
473 | * Undo all the changes done by ip_options_compile(). | |
474 | */ | |
475 | ||
5e73ea1a | 476 | void ip_options_undo(struct ip_options *opt) |
1da177e4 LT |
477 | { |
478 | if (opt->srr) { | |
5e73ea1a | 479 | unsigned char *optptr = opt->__data+opt->srr-sizeof(struct iphdr); |
1da177e4 LT |
480 | memmove(optptr+7, optptr+3, optptr[1]-7); |
481 | memcpy(optptr+3, &opt->faddr, 4); | |
482 | } | |
483 | if (opt->rr_needaddr) { | |
5e73ea1a | 484 | unsigned char *optptr = opt->__data+opt->rr-sizeof(struct iphdr); |
1da177e4 LT |
485 | optptr[2] -= 4; |
486 | memset(&optptr[optptr[2]-1], 0, 4); | |
487 | } | |
488 | if (opt->ts) { | |
5e73ea1a | 489 | unsigned char *optptr = opt->__data+opt->ts-sizeof(struct iphdr); |
1da177e4 LT |
490 | if (opt->ts_needtime) { |
491 | optptr[2] -= 4; | |
492 | memset(&optptr[optptr[2]-1], 0, 4); | |
493 | if ((optptr[3]&0xF) == IPOPT_TS_PRESPEC) | |
494 | optptr[2] -= 4; | |
495 | } | |
496 | if (opt->ts_needaddr) { | |
497 | optptr[2] -= 4; | |
498 | memset(&optptr[optptr[2]-1], 0, 4); | |
499 | } | |
500 | } | |
501 | } | |
502 | ||
f6d8bd05 | 503 | static struct ip_options_rcu *ip_options_get_alloc(const int optlen) |
1da177e4 | 504 | { |
f6d8bd05 | 505 | return kzalloc(sizeof(struct ip_options_rcu) + ((optlen + 3) & ~3), |
37640703 | 506 | GFP_KERNEL); |
4c6ea29d | 507 | } |
1da177e4 | 508 | |
f6d8bd05 ED |
509 | static int ip_options_get_finish(struct net *net, struct ip_options_rcu **optp, |
510 | struct ip_options_rcu *opt, int optlen) | |
4c6ea29d | 511 | { |
1da177e4 | 512 | while (optlen & 3) |
f6d8bd05 ED |
513 | opt->opt.__data[optlen++] = IPOPT_END; |
514 | opt->opt.optlen = optlen; | |
515 | if (optlen && ip_options_compile(net, &opt->opt, NULL)) { | |
1da177e4 LT |
516 | kfree(opt); |
517 | return -EINVAL; | |
518 | } | |
a51482bd | 519 | kfree(*optp); |
1da177e4 LT |
520 | *optp = opt; |
521 | return 0; | |
522 | } | |
523 | ||
f6d8bd05 | 524 | int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, |
f2c4802b | 525 | unsigned char __user *data, int optlen) |
4c6ea29d | 526 | { |
f6d8bd05 | 527 | struct ip_options_rcu *opt = ip_options_get_alloc(optlen); |
4c6ea29d ACM |
528 | |
529 | if (!opt) | |
530 | return -ENOMEM; | |
f6d8bd05 | 531 | if (optlen && copy_from_user(opt->opt.__data, data, optlen)) { |
4c6ea29d ACM |
532 | kfree(opt); |
533 | return -EFAULT; | |
534 | } | |
f2c4802b | 535 | return ip_options_get_finish(net, optp, opt, optlen); |
4c6ea29d ACM |
536 | } |
537 | ||
f6d8bd05 | 538 | int ip_options_get(struct net *net, struct ip_options_rcu **optp, |
f2c4802b | 539 | unsigned char *data, int optlen) |
4c6ea29d | 540 | { |
f6d8bd05 | 541 | struct ip_options_rcu *opt = ip_options_get_alloc(optlen); |
4c6ea29d ACM |
542 | |
543 | if (!opt) | |
544 | return -ENOMEM; | |
545 | if (optlen) | |
f6d8bd05 | 546 | memcpy(opt->opt.__data, data, optlen); |
f2c4802b | 547 | return ip_options_get_finish(net, optp, opt, optlen); |
4c6ea29d ACM |
548 | } |
549 | ||
1da177e4 LT |
550 | void ip_forward_options(struct sk_buff *skb) |
551 | { | |
5e73ea1a DB |
552 | struct ip_options *opt = &(IPCB(skb)->opt); |
553 | unsigned char *optptr; | |
511c3f92 | 554 | struct rtable *rt = skb_rtable(skb); |
d56f90a7 | 555 | unsigned char *raw = skb_network_header(skb); |
1da177e4 LT |
556 | |
557 | if (opt->rr_needaddr) { | |
558 | optptr = (unsigned char *)raw + opt->rr; | |
8e36360a | 559 | ip_rt_get_source(&optptr[optptr[2]-5], skb, rt); |
1da177e4 LT |
560 | opt->is_changed = 1; |
561 | } | |
562 | if (opt->srr_is_hit) { | |
563 | int srrptr, srrspace; | |
564 | ||
565 | optptr = raw + opt->srr; | |
566 | ||
567 | for ( srrptr=optptr[2], srrspace = optptr[1]; | |
568 | srrptr <= srrspace; | |
569 | srrptr += 4 | |
570 | ) { | |
571 | if (srrptr + 3 > srrspace) | |
572 | break; | |
ac8a4810 | 573 | if (memcmp(&opt->nexthop, &optptr[srrptr-1], 4) == 0) |
1da177e4 LT |
574 | break; |
575 | } | |
576 | if (srrptr + 3 <= srrspace) { | |
577 | opt->is_changed = 1; | |
ac8a4810 | 578 | ip_hdr(skb)->daddr = opt->nexthop; |
5dc7883f | 579 | ip_rt_get_source(&optptr[srrptr-1], skb, rt); |
1da177e4 LT |
580 | optptr[2] = srrptr+4; |
581 | } else if (net_ratelimit()) | |
058bd4d2 | 582 | pr_crit("%s(): Argh! Destination lost!\n", __func__); |
1da177e4 LT |
583 | if (opt->ts_needaddr) { |
584 | optptr = raw + opt->ts; | |
8e36360a | 585 | ip_rt_get_source(&optptr[optptr[2]-9], skb, rt); |
1da177e4 LT |
586 | opt->is_changed = 1; |
587 | } | |
588 | } | |
589 | if (opt->is_changed) { | |
590 | opt->is_changed = 0; | |
eddc9ec5 | 591 | ip_send_check(ip_hdr(skb)); |
1da177e4 LT |
592 | } |
593 | } | |
594 | ||
595 | int ip_options_rcv_srr(struct sk_buff *skb) | |
596 | { | |
597 | struct ip_options *opt = &(IPCB(skb)->opt); | |
598 | int srrspace, srrptr; | |
9e12bb22 | 599 | __be32 nexthop; |
eddc9ec5 | 600 | struct iphdr *iph = ip_hdr(skb); |
d56f90a7 | 601 | unsigned char *optptr = skb_network_header(skb) + opt->srr; |
511c3f92 | 602 | struct rtable *rt = skb_rtable(skb); |
1da177e4 | 603 | struct rtable *rt2; |
7fee226a | 604 | unsigned long orefdst; |
1da177e4 LT |
605 | int err; |
606 | ||
10949550 | 607 | if (!rt) |
1da177e4 LT |
608 | return 0; |
609 | ||
610 | if (skb->pkt_type != PACKET_HOST) | |
611 | return -EINVAL; | |
612 | if (rt->rt_type == RTN_UNICAST) { | |
613 | if (!opt->is_strictroute) | |
614 | return 0; | |
615 | icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl(16<<24)); | |
616 | return -EINVAL; | |
617 | } | |
618 | if (rt->rt_type != RTN_LOCAL) | |
619 | return -EINVAL; | |
620 | ||
621 | for (srrptr=optptr[2], srrspace = optptr[1]; srrptr <= srrspace; srrptr += 4) { | |
622 | if (srrptr + 3 > srrspace) { | |
623 | icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl((opt->srr+2)<<24)); | |
624 | return -EINVAL; | |
625 | } | |
626 | memcpy(&nexthop, &optptr[srrptr-1], 4); | |
627 | ||
7fee226a | 628 | orefdst = skb->_skb_refdst; |
adf30907 | 629 | skb_dst_set(skb, NULL); |
1da177e4 | 630 | err = ip_route_input(skb, nexthop, iph->saddr, iph->tos, skb->dev); |
511c3f92 | 631 | rt2 = skb_rtable(skb); |
1da177e4 | 632 | if (err || (rt2->rt_type != RTN_UNICAST && rt2->rt_type != RTN_LOCAL)) { |
7fee226a ED |
633 | skb_dst_drop(skb); |
634 | skb->_skb_refdst = orefdst; | |
1da177e4 LT |
635 | return -EINVAL; |
636 | } | |
7fee226a | 637 | refdst_drop(orefdst); |
1da177e4 LT |
638 | if (rt2->rt_type != RTN_LOCAL) |
639 | break; | |
640 | /* Superfast 8) loopback forward */ | |
c30883bd | 641 | iph->daddr = nexthop; |
1da177e4 LT |
642 | opt->is_changed = 1; |
643 | } | |
644 | if (srrptr <= srrspace) { | |
645 | opt->srr_is_hit = 1; | |
ac8a4810 | 646 | opt->nexthop = nexthop; |
1da177e4 LT |
647 | opt->is_changed = 1; |
648 | } | |
649 | return 0; | |
650 | } | |
462fb2af | 651 | EXPORT_SYMBOL(ip_options_rcv_srr); |