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> |
35ebf65e | 30 | #include <net/ip_fib.h> |
1da177e4 | 31 | |
e905a9ed | 32 | /* |
1da177e4 LT |
33 | * Write options to IP header, record destination address to |
34 | * source route option, address of outgoing interface | |
35 | * (we should already know it, so that this function is allowed be | |
36 | * called only after routing decision) and timestamp, | |
37 | * if we originate this datagram. | |
38 | * | |
39 | * daddr is real destination address, next hop is recorded in IP header. | |
40 | * saddr is address of outgoing interface. | |
41 | */ | |
42 | ||
f6d8bd05 | 43 | void ip_options_build(struct sk_buff *skb, struct ip_options *opt, |
8e36360a | 44 | __be32 daddr, struct rtable *rt, int is_frag) |
1da177e4 | 45 | { |
d56f90a7 | 46 | unsigned char *iph = skb_network_header(skb); |
1da177e4 LT |
47 | |
48 | memcpy(&(IPCB(skb)->opt), opt, sizeof(struct ip_options)); | |
49 | memcpy(iph+sizeof(struct iphdr), opt->__data, opt->optlen); | |
50 | opt = &(IPCB(skb)->opt); | |
1da177e4 LT |
51 | |
52 | if (opt->srr) | |
53 | memcpy(iph+opt->srr+iph[opt->srr+1]-4, &daddr, 4); | |
54 | ||
55 | if (!is_frag) { | |
56 | if (opt->rr_needaddr) | |
8e36360a | 57 | ip_rt_get_source(iph+opt->rr+iph[opt->rr+2]-5, skb, rt); |
1da177e4 | 58 | if (opt->ts_needaddr) |
8e36360a | 59 | ip_rt_get_source(iph+opt->ts+iph[opt->ts+2]-9, skb, rt); |
1da177e4 | 60 | if (opt->ts_needtime) { |
f25c3d61 | 61 | struct timespec tv; |
e25d2ca6 | 62 | __be32 midtime; |
f25c3d61 YH |
63 | getnstimeofday(&tv); |
64 | midtime = htonl((tv.tv_sec % 86400) * MSEC_PER_SEC + tv.tv_nsec / NSEC_PER_MSEC); | |
1da177e4 LT |
65 | memcpy(iph+opt->ts+iph[opt->ts+2]-5, &midtime, 4); |
66 | } | |
67 | return; | |
68 | } | |
69 | if (opt->rr) { | |
70 | memset(iph+opt->rr, IPOPT_NOP, iph[opt->rr+1]); | |
71 | opt->rr = 0; | |
72 | opt->rr_needaddr = 0; | |
73 | } | |
74 | if (opt->ts) { | |
75 | memset(iph+opt->ts, IPOPT_NOP, iph[opt->ts+1]); | |
76 | opt->ts = 0; | |
77 | opt->ts_needaddr = opt->ts_needtime = 0; | |
78 | } | |
79 | } | |
80 | ||
e905a9ed | 81 | /* |
1da177e4 LT |
82 | * Provided (sopt, skb) points to received options, |
83 | * build in dopt compiled option set appropriate for answering. | |
84 | * i.e. invert SRR option, copy anothers, | |
85 | * and grab room in RR/TS options. | |
86 | * | |
87 | * NOTE: dopt cannot point to skb. | |
88 | */ | |
89 | ||
24a2d43d ED |
90 | int __ip_options_echo(struct ip_options *dopt, struct sk_buff *skb, |
91 | const struct ip_options *sopt) | |
1da177e4 | 92 | { |
1da177e4 LT |
93 | unsigned char *sptr, *dptr; |
94 | int soffset, doffset; | |
95 | int optlen; | |
1da177e4 LT |
96 | |
97 | memset(dopt, 0, sizeof(struct ip_options)); | |
98 | ||
f6d8bd05 | 99 | if (sopt->optlen == 0) |
1da177e4 | 100 | return 0; |
1da177e4 | 101 | |
d56f90a7 | 102 | sptr = skb_network_header(skb); |
1da177e4 LT |
103 | dptr = dopt->__data; |
104 | ||
1da177e4 LT |
105 | if (sopt->rr) { |
106 | optlen = sptr[sopt->rr+1]; | |
107 | soffset = sptr[sopt->rr+2]; | |
108 | dopt->rr = dopt->optlen + sizeof(struct iphdr); | |
109 | memcpy(dptr, sptr+sopt->rr, optlen); | |
110 | if (sopt->rr_needaddr && soffset <= optlen) { | |
111 | if (soffset + 3 > optlen) | |
112 | return -EINVAL; | |
113 | dptr[2] = soffset + 4; | |
114 | dopt->rr_needaddr = 1; | |
115 | } | |
116 | dptr += optlen; | |
117 | dopt->optlen += optlen; | |
118 | } | |
119 | if (sopt->ts) { | |
120 | optlen = sptr[sopt->ts+1]; | |
121 | soffset = sptr[sopt->ts+2]; | |
122 | dopt->ts = dopt->optlen + sizeof(struct iphdr); | |
123 | memcpy(dptr, sptr+sopt->ts, optlen); | |
124 | if (soffset <= optlen) { | |
125 | if (sopt->ts_needaddr) { | |
126 | if (soffset + 3 > optlen) | |
127 | return -EINVAL; | |
128 | dopt->ts_needaddr = 1; | |
129 | soffset += 4; | |
130 | } | |
131 | if (sopt->ts_needtime) { | |
132 | if (soffset + 3 > optlen) | |
133 | return -EINVAL; | |
134 | if ((dptr[3]&0xF) != IPOPT_TS_PRESPEC) { | |
135 | dopt->ts_needtime = 1; | |
136 | soffset += 4; | |
137 | } else { | |
138 | dopt->ts_needtime = 0; | |
139 | ||
8628bd8a | 140 | if (soffset + 7 <= optlen) { |
fd683222 | 141 | __be32 addr; |
1da177e4 | 142 | |
8628bd8a JL |
143 | memcpy(&addr, dptr+soffset-1, 4); |
144 | if (inet_addr_type(dev_net(skb_dst(skb)->dev), addr) != RTN_UNICAST) { | |
1da177e4 LT |
145 | dopt->ts_needtime = 1; |
146 | soffset += 8; | |
147 | } | |
148 | } | |
149 | } | |
150 | } | |
151 | dptr[2] = soffset; | |
152 | } | |
153 | dptr += optlen; | |
154 | dopt->optlen += optlen; | |
155 | } | |
156 | if (sopt->srr) { | |
f6d8bd05 | 157 | unsigned char *start = sptr+sopt->srr; |
3ca3c68e | 158 | __be32 faddr; |
1da177e4 LT |
159 | |
160 | optlen = start[1]; | |
161 | soffset = start[2]; | |
162 | doffset = 0; | |
163 | if (soffset > optlen) | |
164 | soffset = optlen + 1; | |
165 | soffset -= 4; | |
166 | if (soffset > 3) { | |
167 | memcpy(&faddr, &start[soffset-1], 4); | |
a22318e8 | 168 | for (soffset -= 4, doffset = 4; soffset > 3; soffset -= 4, doffset += 4) |
1da177e4 LT |
169 | memcpy(&dptr[doffset-1], &start[soffset-1], 4); |
170 | /* | |
171 | * RFC1812 requires to fix illegal source routes. | |
172 | */ | |
eddc9ec5 ACM |
173 | if (memcmp(&ip_hdr(skb)->saddr, |
174 | &start[soffset + 3], 4) == 0) | |
1da177e4 LT |
175 | doffset -= 4; |
176 | } | |
177 | if (doffset > 3) { | |
6255e5ea JA |
178 | __be32 daddr = fib_compute_spec_dst(skb); |
179 | ||
1da177e4 LT |
180 | memcpy(&start[doffset-1], &daddr, 4); |
181 | dopt->faddr = faddr; | |
182 | dptr[0] = start[0]; | |
183 | dptr[1] = doffset+3; | |
184 | dptr[2] = 4; | |
185 | dptr += doffset+3; | |
186 | dopt->srr = dopt->optlen + sizeof(struct iphdr); | |
187 | dopt->optlen += doffset+3; | |
188 | dopt->is_strictroute = sopt->is_strictroute; | |
189 | } | |
190 | } | |
11a03f78 PM |
191 | if (sopt->cipso) { |
192 | optlen = sptr[sopt->cipso+1]; | |
193 | dopt->cipso = dopt->optlen+sizeof(struct iphdr); | |
194 | memcpy(dptr, sptr+sopt->cipso, optlen); | |
195 | dptr += optlen; | |
196 | dopt->optlen += optlen; | |
197 | } | |
1da177e4 LT |
198 | while (dopt->optlen & 3) { |
199 | *dptr++ = IPOPT_END; | |
200 | dopt->optlen++; | |
201 | } | |
202 | return 0; | |
203 | } | |
204 | ||
205 | /* | |
206 | * Options "fragmenting", just fill options not | |
207 | * allowed in fragments with NOOPs. | |
208 | * Simple and stupid 8), but the most efficient way. | |
209 | */ | |
210 | ||
5e73ea1a | 211 | void ip_options_fragment(struct sk_buff *skb) |
1da177e4 | 212 | { |
d56f90a7 | 213 | unsigned char *optptr = skb_network_header(skb) + sizeof(struct iphdr); |
5e73ea1a | 214 | struct ip_options *opt = &(IPCB(skb)->opt); |
1da177e4 LT |
215 | int l = opt->optlen; |
216 | int optlen; | |
217 | ||
218 | while (l > 0) { | |
219 | switch (*optptr) { | |
220 | case IPOPT_END: | |
221 | return; | |
222 | case IPOPT_NOOP: | |
223 | l--; | |
224 | optptr++; | |
225 | continue; | |
226 | } | |
227 | optlen = optptr[1]; | |
a22318e8 | 228 | if (optlen < 2 || optlen > l) |
1da177e4 LT |
229 | return; |
230 | if (!IPOPT_COPIED(*optptr)) | |
231 | memset(optptr, IPOPT_NOOP, optlen); | |
232 | l -= optlen; | |
233 | optptr += optlen; | |
234 | } | |
235 | opt->ts = 0; | |
236 | opt->rr = 0; | |
237 | opt->rr_needaddr = 0; | |
238 | opt->ts_needaddr = 0; | |
239 | opt->ts_needtime = 0; | |
1da177e4 LT |
240 | } |
241 | ||
bf5e53e3 ED |
242 | /* helper used by ip_options_compile() to call fib_compute_spec_dst() |
243 | * at most one time. | |
244 | */ | |
245 | static void spec_dst_fill(__be32 *spec_dst, struct sk_buff *skb) | |
246 | { | |
247 | if (*spec_dst == htonl(INADDR_ANY)) | |
248 | *spec_dst = fib_compute_spec_dst(skb); | |
249 | } | |
250 | ||
1da177e4 LT |
251 | /* |
252 | * Verify options and fill pointers in struct options. | |
253 | * Caller should clear *opt, and set opt->data. | |
254 | * If opt == NULL, then skb->data should point to IP header. | |
255 | */ | |
256 | ||
0e6bd4a1 | 257 | int ip_options_compile(struct net *net, |
5e73ea1a | 258 | struct ip_options *opt, struct sk_buff *skb) |
1da177e4 | 259 | { |
bf5e53e3 | 260 | __be32 spec_dst = htonl(INADDR_ANY); |
5e73ea1a | 261 | unsigned char *pp_ptr = NULL; |
11604721 | 262 | struct rtable *rt = NULL; |
35ebf65e DM |
263 | unsigned char *optptr; |
264 | unsigned char *iph; | |
265 | int optlen, l; | |
1da177e4 | 266 | |
22aba383 | 267 | if (skb != NULL) { |
11604721 | 268 | rt = skb_rtable(skb); |
22aba383 DL |
269 | optptr = (unsigned char *)&(ip_hdr(skb)[1]); |
270 | } else | |
10fe7d85 | 271 | optptr = opt->__data; |
22aba383 | 272 | iph = optptr - sizeof(struct iphdr); |
1da177e4 LT |
273 | |
274 | for (l = opt->optlen; l > 0; ) { | |
275 | switch (*optptr) { | |
dd9b4559 | 276 | case IPOPT_END: |
a22318e8 | 277 | for (optptr++, l--; l > 0; optptr++, l--) { |
1da177e4 LT |
278 | if (*optptr != IPOPT_END) { |
279 | *optptr = IPOPT_END; | |
280 | opt->is_changed = 1; | |
281 | } | |
282 | } | |
283 | goto eol; | |
dd9b4559 | 284 | case IPOPT_NOOP: |
1da177e4 LT |
285 | l--; |
286 | optptr++; | |
287 | continue; | |
288 | } | |
10ec9472 ED |
289 | if (unlikely(l < 2)) { |
290 | pp_ptr = optptr; | |
291 | goto error; | |
292 | } | |
1da177e4 | 293 | optlen = optptr[1]; |
a22318e8 | 294 | if (optlen < 2 || optlen > l) { |
1da177e4 LT |
295 | pp_ptr = optptr; |
296 | goto error; | |
297 | } | |
298 | switch (*optptr) { | |
dd9b4559 WC |
299 | case IPOPT_SSRR: |
300 | case IPOPT_LSRR: | |
1da177e4 LT |
301 | if (optlen < 3) { |
302 | pp_ptr = optptr + 1; | |
303 | goto error; | |
304 | } | |
305 | if (optptr[2] < 4) { | |
306 | pp_ptr = optptr + 2; | |
307 | goto error; | |
308 | } | |
309 | /* NB: cf RFC-1812 5.2.4.1 */ | |
310 | if (opt->srr) { | |
311 | pp_ptr = optptr; | |
312 | goto error; | |
313 | } | |
314 | if (!skb) { | |
315 | if (optptr[2] != 4 || optlen < 7 || ((optlen-3) & 3)) { | |
316 | pp_ptr = optptr + 1; | |
317 | goto error; | |
318 | } | |
319 | memcpy(&opt->faddr, &optptr[3], 4); | |
320 | if (optlen > 7) | |
321 | memmove(&optptr[3], &optptr[7], optlen-7); | |
322 | } | |
323 | opt->is_strictroute = (optptr[0] == IPOPT_SSRR); | |
324 | opt->srr = optptr - iph; | |
325 | break; | |
dd9b4559 | 326 | case IPOPT_RR: |
1da177e4 LT |
327 | if (opt->rr) { |
328 | pp_ptr = optptr; | |
329 | goto error; | |
330 | } | |
331 | if (optlen < 3) { | |
332 | pp_ptr = optptr + 1; | |
333 | goto error; | |
334 | } | |
335 | if (optptr[2] < 4) { | |
336 | pp_ptr = optptr + 2; | |
337 | goto error; | |
338 | } | |
339 | if (optptr[2] <= optlen) { | |
340 | if (optptr[2]+3 > optlen) { | |
341 | pp_ptr = optptr + 2; | |
342 | goto error; | |
343 | } | |
11604721 | 344 | if (rt) { |
bf5e53e3 | 345 | spec_dst_fill(&spec_dst, skb); |
35ebf65e | 346 | memcpy(&optptr[optptr[2]-1], &spec_dst, 4); |
1da177e4 LT |
347 | opt->is_changed = 1; |
348 | } | |
349 | optptr[2] += 4; | |
350 | opt->rr_needaddr = 1; | |
351 | } | |
352 | opt->rr = optptr - iph; | |
353 | break; | |
dd9b4559 | 354 | case IPOPT_TIMESTAMP: |
1da177e4 LT |
355 | if (opt->ts) { |
356 | pp_ptr = optptr; | |
357 | goto error; | |
358 | } | |
359 | if (optlen < 4) { | |
360 | pp_ptr = optptr + 1; | |
361 | goto error; | |
362 | } | |
363 | if (optptr[2] < 5) { | |
364 | pp_ptr = optptr + 2; | |
365 | goto error; | |
366 | } | |
367 | if (optptr[2] <= optlen) { | |
48bdf072 | 368 | unsigned char *timeptr = NULL; |
5a2b646f | 369 | if (optptr[2]+3 > optlen) { |
1da177e4 LT |
370 | pp_ptr = optptr + 2; |
371 | goto error; | |
372 | } | |
373 | switch (optptr[3]&0xF) { | |
dd9b4559 | 374 | case IPOPT_TS_TSONLY: |
e905a9ed | 375 | if (skb) |
48bdf072 | 376 | timeptr = &optptr[optptr[2]-1]; |
1da177e4 LT |
377 | opt->ts_needtime = 1; |
378 | optptr[2] += 4; | |
379 | break; | |
dd9b4559 | 380 | case IPOPT_TS_TSANDADDR: |
5a2b646f | 381 | if (optptr[2]+7 > optlen) { |
1da177e4 LT |
382 | pp_ptr = optptr + 2; |
383 | goto error; | |
384 | } | |
11604721 | 385 | if (rt) { |
bf5e53e3 | 386 | spec_dst_fill(&spec_dst, skb); |
35ebf65e | 387 | memcpy(&optptr[optptr[2]-1], &spec_dst, 4); |
48bdf072 | 388 | timeptr = &optptr[optptr[2]+3]; |
1da177e4 LT |
389 | } |
390 | opt->ts_needaddr = 1; | |
391 | opt->ts_needtime = 1; | |
392 | optptr[2] += 8; | |
393 | break; | |
dd9b4559 | 394 | case IPOPT_TS_PRESPEC: |
5a2b646f | 395 | if (optptr[2]+7 > optlen) { |
1da177e4 LT |
396 | pp_ptr = optptr + 2; |
397 | goto error; | |
398 | } | |
1da177e4 | 399 | { |
fd683222 | 400 | __be32 addr; |
1da177e4 | 401 | memcpy(&addr, &optptr[optptr[2]-1], 4); |
0e6bd4a1 | 402 | if (inet_addr_type(net, addr) == RTN_UNICAST) |
1da177e4 LT |
403 | break; |
404 | if (skb) | |
48bdf072 | 405 | timeptr = &optptr[optptr[2]+3]; |
1da177e4 LT |
406 | } |
407 | opt->ts_needtime = 1; | |
408 | optptr[2] += 8; | |
409 | break; | |
dd9b4559 | 410 | default: |
52e804c6 | 411 | if (!skb && !ns_capable(net->user_ns, CAP_NET_RAW)) { |
1da177e4 LT |
412 | pp_ptr = optptr + 3; |
413 | goto error; | |
414 | } | |
415 | break; | |
416 | } | |
417 | if (timeptr) { | |
f25c3d61 | 418 | struct timespec tv; |
48bdf072 | 419 | u32 midtime; |
f25c3d61 | 420 | getnstimeofday(&tv); |
48bdf072 CM |
421 | midtime = (tv.tv_sec % 86400) * MSEC_PER_SEC + tv.tv_nsec / NSEC_PER_MSEC; |
422 | put_unaligned_be32(midtime, timeptr); | |
1da177e4 LT |
423 | opt->is_changed = 1; |
424 | } | |
fa2b04f4 | 425 | } else if ((optptr[3]&0xF) != IPOPT_TS_PRESPEC) { |
95c96174 | 426 | unsigned int overflow = optptr[3]>>4; |
1da177e4 LT |
427 | if (overflow == 15) { |
428 | pp_ptr = optptr + 3; | |
429 | goto error; | |
430 | } | |
1da177e4 LT |
431 | if (skb) { |
432 | optptr[3] = (optptr[3]&0xF)|((overflow+1)<<4); | |
433 | opt->is_changed = 1; | |
434 | } | |
435 | } | |
4660c7f4 | 436 | opt->ts = optptr - iph; |
1da177e4 | 437 | break; |
dd9b4559 | 438 | case IPOPT_RA: |
1da177e4 LT |
439 | if (optlen < 4) { |
440 | pp_ptr = optptr + 1; | |
441 | goto error; | |
442 | } | |
443 | if (optptr[2] == 0 && optptr[3] == 0) | |
444 | opt->router_alert = optptr - iph; | |
445 | break; | |
dd9b4559 | 446 | case IPOPT_CIPSO: |
52e804c6 | 447 | if ((!skb && !ns_capable(net->user_ns, CAP_NET_RAW)) || opt->cipso) { |
11a03f78 PM |
448 | pp_ptr = optptr; |
449 | goto error; | |
450 | } | |
451 | opt->cipso = optptr - iph; | |
15c45f7b | 452 | if (cipso_v4_validate(skb, &optptr)) { |
11a03f78 PM |
453 | pp_ptr = optptr; |
454 | goto error; | |
455 | } | |
456 | break; | |
dd9b4559 WC |
457 | case IPOPT_SEC: |
458 | case IPOPT_SID: | |
459 | default: | |
52e804c6 | 460 | if (!skb && !ns_capable(net->user_ns, CAP_NET_RAW)) { |
1da177e4 LT |
461 | pp_ptr = optptr; |
462 | goto error; | |
463 | } | |
464 | break; | |
465 | } | |
466 | l -= optlen; | |
467 | optptr += optlen; | |
468 | } | |
469 | ||
470 | eol: | |
471 | if (!pp_ptr) | |
472 | return 0; | |
473 | ||
474 | error: | |
475 | if (skb) { | |
476 | icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl((pp_ptr-iph)<<24)); | |
477 | } | |
478 | return -EINVAL; | |
479 | } | |
462fb2af | 480 | EXPORT_SYMBOL(ip_options_compile); |
1da177e4 LT |
481 | |
482 | /* | |
483 | * Undo all the changes done by ip_options_compile(). | |
484 | */ | |
485 | ||
5e73ea1a | 486 | void ip_options_undo(struct ip_options *opt) |
1da177e4 LT |
487 | { |
488 | if (opt->srr) { | |
5e73ea1a | 489 | unsigned char *optptr = opt->__data+opt->srr-sizeof(struct iphdr); |
1da177e4 LT |
490 | memmove(optptr+7, optptr+3, optptr[1]-7); |
491 | memcpy(optptr+3, &opt->faddr, 4); | |
492 | } | |
493 | if (opt->rr_needaddr) { | |
5e73ea1a | 494 | unsigned char *optptr = opt->__data+opt->rr-sizeof(struct iphdr); |
1da177e4 LT |
495 | optptr[2] -= 4; |
496 | memset(&optptr[optptr[2]-1], 0, 4); | |
497 | } | |
498 | if (opt->ts) { | |
5e73ea1a | 499 | unsigned char *optptr = opt->__data+opt->ts-sizeof(struct iphdr); |
1da177e4 LT |
500 | if (opt->ts_needtime) { |
501 | optptr[2] -= 4; | |
502 | memset(&optptr[optptr[2]-1], 0, 4); | |
503 | if ((optptr[3]&0xF) == IPOPT_TS_PRESPEC) | |
504 | optptr[2] -= 4; | |
505 | } | |
506 | if (opt->ts_needaddr) { | |
507 | optptr[2] -= 4; | |
508 | memset(&optptr[optptr[2]-1], 0, 4); | |
509 | } | |
510 | } | |
511 | } | |
512 | ||
f6d8bd05 | 513 | static struct ip_options_rcu *ip_options_get_alloc(const int optlen) |
1da177e4 | 514 | { |
f6d8bd05 | 515 | return kzalloc(sizeof(struct ip_options_rcu) + ((optlen + 3) & ~3), |
37640703 | 516 | GFP_KERNEL); |
4c6ea29d | 517 | } |
1da177e4 | 518 | |
f6d8bd05 ED |
519 | static int ip_options_get_finish(struct net *net, struct ip_options_rcu **optp, |
520 | struct ip_options_rcu *opt, int optlen) | |
4c6ea29d | 521 | { |
1da177e4 | 522 | while (optlen & 3) |
f6d8bd05 ED |
523 | opt->opt.__data[optlen++] = IPOPT_END; |
524 | opt->opt.optlen = optlen; | |
525 | if (optlen && ip_options_compile(net, &opt->opt, NULL)) { | |
1da177e4 LT |
526 | kfree(opt); |
527 | return -EINVAL; | |
528 | } | |
a51482bd | 529 | kfree(*optp); |
1da177e4 LT |
530 | *optp = opt; |
531 | return 0; | |
532 | } | |
533 | ||
f6d8bd05 | 534 | int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, |
f2c4802b | 535 | unsigned char __user *data, int optlen) |
4c6ea29d | 536 | { |
f6d8bd05 | 537 | struct ip_options_rcu *opt = ip_options_get_alloc(optlen); |
4c6ea29d ACM |
538 | |
539 | if (!opt) | |
540 | return -ENOMEM; | |
f6d8bd05 | 541 | if (optlen && copy_from_user(opt->opt.__data, data, optlen)) { |
4c6ea29d ACM |
542 | kfree(opt); |
543 | return -EFAULT; | |
544 | } | |
f2c4802b | 545 | return ip_options_get_finish(net, optp, opt, optlen); |
4c6ea29d ACM |
546 | } |
547 | ||
f6d8bd05 | 548 | int ip_options_get(struct net *net, struct ip_options_rcu **optp, |
f2c4802b | 549 | unsigned char *data, int optlen) |
4c6ea29d | 550 | { |
f6d8bd05 | 551 | struct ip_options_rcu *opt = ip_options_get_alloc(optlen); |
4c6ea29d ACM |
552 | |
553 | if (!opt) | |
554 | return -ENOMEM; | |
555 | if (optlen) | |
f6d8bd05 | 556 | memcpy(opt->opt.__data, data, optlen); |
f2c4802b | 557 | return ip_options_get_finish(net, optp, opt, optlen); |
4c6ea29d ACM |
558 | } |
559 | ||
1da177e4 LT |
560 | void ip_forward_options(struct sk_buff *skb) |
561 | { | |
5e73ea1a DB |
562 | struct ip_options *opt = &(IPCB(skb)->opt); |
563 | unsigned char *optptr; | |
511c3f92 | 564 | struct rtable *rt = skb_rtable(skb); |
d56f90a7 | 565 | unsigned char *raw = skb_network_header(skb); |
1da177e4 LT |
566 | |
567 | if (opt->rr_needaddr) { | |
568 | optptr = (unsigned char *)raw + opt->rr; | |
8e36360a | 569 | ip_rt_get_source(&optptr[optptr[2]-5], skb, rt); |
1da177e4 LT |
570 | opt->is_changed = 1; |
571 | } | |
572 | if (opt->srr_is_hit) { | |
573 | int srrptr, srrspace; | |
574 | ||
575 | optptr = raw + opt->srr; | |
576 | ||
a22318e8 | 577 | for ( srrptr = optptr[2], srrspace = optptr[1]; |
1da177e4 LT |
578 | srrptr <= srrspace; |
579 | srrptr += 4 | |
580 | ) { | |
581 | if (srrptr + 3 > srrspace) | |
582 | break; | |
ac8a4810 | 583 | if (memcmp(&opt->nexthop, &optptr[srrptr-1], 4) == 0) |
1da177e4 LT |
584 | break; |
585 | } | |
586 | if (srrptr + 3 <= srrspace) { | |
587 | opt->is_changed = 1; | |
ac8a4810 | 588 | ip_hdr(skb)->daddr = opt->nexthop; |
5dc7883f | 589 | ip_rt_get_source(&optptr[srrptr-1], skb, rt); |
1da177e4 | 590 | optptr[2] = srrptr+4; |
e87cc472 JP |
591 | } else { |
592 | net_crit_ratelimited("%s(): Argh! Destination lost!\n", | |
593 | __func__); | |
594 | } | |
1da177e4 LT |
595 | if (opt->ts_needaddr) { |
596 | optptr = raw + opt->ts; | |
8e36360a | 597 | ip_rt_get_source(&optptr[optptr[2]-9], skb, rt); |
1da177e4 LT |
598 | opt->is_changed = 1; |
599 | } | |
600 | } | |
601 | if (opt->is_changed) { | |
602 | opt->is_changed = 0; | |
eddc9ec5 | 603 | ip_send_check(ip_hdr(skb)); |
1da177e4 LT |
604 | } |
605 | } | |
606 | ||
607 | int ip_options_rcv_srr(struct sk_buff *skb) | |
608 | { | |
609 | struct ip_options *opt = &(IPCB(skb)->opt); | |
610 | int srrspace, srrptr; | |
9e12bb22 | 611 | __be32 nexthop; |
eddc9ec5 | 612 | struct iphdr *iph = ip_hdr(skb); |
d56f90a7 | 613 | unsigned char *optptr = skb_network_header(skb) + opt->srr; |
511c3f92 | 614 | struct rtable *rt = skb_rtable(skb); |
1da177e4 | 615 | struct rtable *rt2; |
7fee226a | 616 | unsigned long orefdst; |
1da177e4 LT |
617 | int err; |
618 | ||
10949550 | 619 | if (!rt) |
1da177e4 LT |
620 | return 0; |
621 | ||
622 | if (skb->pkt_type != PACKET_HOST) | |
623 | return -EINVAL; | |
624 | if (rt->rt_type == RTN_UNICAST) { | |
625 | if (!opt->is_strictroute) | |
626 | return 0; | |
627 | icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl(16<<24)); | |
628 | return -EINVAL; | |
629 | } | |
630 | if (rt->rt_type != RTN_LOCAL) | |
631 | return -EINVAL; | |
632 | ||
a22318e8 | 633 | for (srrptr = optptr[2], srrspace = optptr[1]; srrptr <= srrspace; srrptr += 4) { |
1da177e4 LT |
634 | if (srrptr + 3 > srrspace) { |
635 | icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl((opt->srr+2)<<24)); | |
636 | return -EINVAL; | |
637 | } | |
638 | memcpy(&nexthop, &optptr[srrptr-1], 4); | |
639 | ||
7fee226a | 640 | orefdst = skb->_skb_refdst; |
adf30907 | 641 | skb_dst_set(skb, NULL); |
1da177e4 | 642 | err = ip_route_input(skb, nexthop, iph->saddr, iph->tos, skb->dev); |
511c3f92 | 643 | rt2 = skb_rtable(skb); |
1da177e4 | 644 | if (err || (rt2->rt_type != RTN_UNICAST && rt2->rt_type != RTN_LOCAL)) { |
7fee226a ED |
645 | skb_dst_drop(skb); |
646 | skb->_skb_refdst = orefdst; | |
1da177e4 LT |
647 | return -EINVAL; |
648 | } | |
7fee226a | 649 | refdst_drop(orefdst); |
1da177e4 LT |
650 | if (rt2->rt_type != RTN_LOCAL) |
651 | break; | |
652 | /* Superfast 8) loopback forward */ | |
c30883bd | 653 | iph->daddr = nexthop; |
1da177e4 LT |
654 | opt->is_changed = 1; |
655 | } | |
656 | if (srrptr <= srrspace) { | |
657 | opt->srr_is_hit = 1; | |
ac8a4810 | 658 | opt->nexthop = nexthop; |
1da177e4 LT |
659 | opt->is_changed = 1; |
660 | } | |
661 | return 0; | |
662 | } | |
462fb2af | 663 | EXPORT_SYMBOL(ip_options_rcv_srr); |