1 | #define pr_fmt(fmt) "IPsec: " fmt |
2 | |
3 | #include <crypto/algapi.h> |
4 | #include <crypto/hash.h> |
5 | #include <linux/err.h> |
6 | #include <linux/module.h> |
7 | #include <linux/slab.h> |
8 | #include <net/ip.h> |
9 | #include <net/xfrm.h> |
10 | #include <net/ah.h> |
11 | #include <linux/crypto.h> |
12 | #include <linux/pfkeyv2.h> |
13 | #include <linux/scatterlist.h> |
14 | #include <net/icmp.h> |
15 | #include <net/protocol.h> |
16 | |
17 | struct ah_skb_cb { |
18 | struct xfrm_skb_cb xfrm; |
19 | void *tmp; |
20 | }; |
21 | |
22 | #define AH_SKB_CB(__skb) ((struct ah_skb_cb *)&((__skb)->cb[0])) |
23 | |
24 | static void *ah_alloc_tmp(struct crypto_ahash *ahash, int nfrags, |
25 | unsigned int size) |
26 | { |
27 | unsigned int len; |
28 | |
29 | len = size + crypto_ahash_digestsize(ahash) + |
30 | (crypto_ahash_alignmask(ahash) & |
31 | ~(crypto_tfm_ctx_alignment() - 1)); |
32 | |
33 | len = ALIGN(len, crypto_tfm_ctx_alignment()); |
34 | |
35 | len += sizeof(struct ahash_request) + crypto_ahash_reqsize(ahash); |
36 | len = ALIGN(len, __alignof__(struct scatterlist)); |
37 | |
38 | len += sizeof(struct scatterlist) * nfrags; |
39 | |
40 | return kmalloc(len, GFP_ATOMIC); |
41 | } |
42 | |
43 | static inline u8 *ah_tmp_auth(void *tmp, unsigned int offset) |
44 | { |
45 | return tmp + offset; |
46 | } |
47 | |
48 | static inline u8 *ah_tmp_icv(struct crypto_ahash *ahash, void *tmp, |
49 | unsigned int offset) |
50 | { |
51 | return PTR_ALIGN((u8 *)tmp + offset, crypto_ahash_alignmask(ahash) + 1); |
52 | } |
53 | |
54 | static inline struct ahash_request *ah_tmp_req(struct crypto_ahash *ahash, |
55 | u8 *icv) |
56 | { |
57 | struct ahash_request *req; |
58 | |
59 | req = (void *)PTR_ALIGN(icv + crypto_ahash_digestsize(ahash), |
60 | crypto_tfm_ctx_alignment()); |
61 | |
62 | ahash_request_set_tfm(req, ahash); |
63 | |
64 | return req; |
65 | } |
66 | |
67 | static inline struct scatterlist *ah_req_sg(struct crypto_ahash *ahash, |
68 | struct ahash_request *req) |
69 | { |
70 | return (void *)ALIGN((unsigned long)(req + 1) + |
71 | crypto_ahash_reqsize(ahash), |
72 | __alignof__(struct scatterlist)); |
73 | } |
74 | |
75 | /* Clear mutable options and find final destination to substitute |
76 | * into IP header for icv calculation. Options are already checked |
77 | * for validity, so paranoia is not required. */ |
78 | |
79 | static int ip_clear_mutable_options(const struct iphdr *iph, __be32 *daddr) |
80 | { |
81 | unsigned char *optptr = (unsigned char *)(iph+1); |
82 | int l = iph->ihl*4 - sizeof(struct iphdr); |
83 | int optlen; |
84 | |
85 | while (l > 0) { |
86 | switch (*optptr) { |
87 | case IPOPT_END: |
88 | return 0; |
89 | case IPOPT_NOOP: |
90 | l--; |
91 | optptr++; |
92 | continue; |
93 | } |
94 | optlen = optptr[1]; |
95 | if (optlen<2 || optlen>l) |
96 | return -EINVAL; |
97 | switch (*optptr) { |
98 | case IPOPT_SEC: |
99 | case 0x85: /* Some "Extended Security" crap. */ |
100 | case IPOPT_CIPSO: |
101 | case IPOPT_RA: |
102 | case 0x80|21: /* RFC1770 */ |
103 | break; |
104 | case IPOPT_LSRR: |
105 | case IPOPT_SSRR: |
106 | if (optlen < 6) |
107 | return -EINVAL; |
108 | memcpy(daddr, optptr+optlen-4, 4); |
109 | /* Fall through */ |
110 | default: |
111 | memset(optptr, 0, optlen); |
112 | } |
113 | l -= optlen; |
114 | optptr += optlen; |
115 | } |
116 | return 0; |
117 | } |
118 | |
119 | static void ah_output_done(struct crypto_async_request *base, int err) |
120 | { |
121 | u8 *icv; |
122 | struct iphdr *iph; |
123 | struct sk_buff *skb = base->data; |
124 | struct xfrm_state *x = skb_dst(skb)->xfrm; |
125 | struct ah_data *ahp = x->data; |
126 | struct iphdr *top_iph = ip_hdr(skb); |
127 | struct ip_auth_hdr *ah = ip_auth_hdr(skb); |
128 | int ihl = ip_hdrlen(skb); |
129 | |
130 | iph = AH_SKB_CB(skb)->tmp; |
131 | icv = ah_tmp_icv(ahp->ahash, iph, ihl); |
132 | memcpy(ah->auth_data, icv, ahp->icv_trunc_len); |
133 | |
134 | top_iph->tos = iph->tos; |
135 | top_iph->ttl = iph->ttl; |
136 | top_iph->frag_off = iph->frag_off; |
137 | if (top_iph->ihl != 5) { |
138 | top_iph->daddr = iph->daddr; |
139 | memcpy(top_iph+1, iph+1, top_iph->ihl*4 - sizeof(struct iphdr)); |
140 | } |
141 | |
142 | kfree(AH_SKB_CB(skb)->tmp); |
143 | xfrm_output_resume(skb, err); |
144 | } |
145 | |
146 | static int ah_output(struct xfrm_state *x, struct sk_buff *skb) |
147 | { |
148 | int err; |
149 | int nfrags; |
150 | int ihl; |
151 | u8 *icv; |
152 | struct sk_buff *trailer; |
153 | struct crypto_ahash *ahash; |
154 | struct ahash_request *req; |
155 | struct scatterlist *sg; |
156 | struct iphdr *iph, *top_iph; |
157 | struct ip_auth_hdr *ah; |
158 | struct ah_data *ahp; |
159 | int seqhi_len = 0; |
160 | __be32 *seqhi; |
161 | int sglists = 0; |
162 | struct scatterlist *seqhisg; |
163 | |
164 | ahp = x->data; |
165 | ahash = ahp->ahash; |
166 | |
167 | if ((err = skb_cow_data(skb, 0, &trailer)) < 0) |
168 | goto out; |
169 | nfrags = err; |
170 | |
171 | skb_push(skb, -skb_network_offset(skb)); |
172 | ah = ip_auth_hdr(skb); |
173 | ihl = ip_hdrlen(skb); |
174 | |
175 | if (x->props.flags & XFRM_STATE_ESN) { |
176 | sglists = 1; |
177 | seqhi_len = sizeof(*seqhi); |
178 | } |
179 | err = -ENOMEM; |
180 | iph = ah_alloc_tmp(ahash, nfrags + sglists, ihl + seqhi_len); |
181 | if (!iph) |
182 | goto out; |
183 | seqhi = (__be32 *)((char *)iph + ihl); |
184 | icv = ah_tmp_icv(ahash, seqhi, seqhi_len); |
185 | req = ah_tmp_req(ahash, icv); |
186 | sg = ah_req_sg(ahash, req); |
187 | seqhisg = sg + nfrags; |
188 | |
189 | memset(ah->auth_data, 0, ahp->icv_trunc_len); |
190 | |
191 | top_iph = ip_hdr(skb); |
192 | |
193 | iph->tos = top_iph->tos; |
194 | iph->ttl = top_iph->ttl; |
195 | iph->frag_off = top_iph->frag_off; |
196 | |
197 | if (top_iph->ihl != 5) { |
198 | iph->daddr = top_iph->daddr; |
199 | memcpy(iph+1, top_iph+1, top_iph->ihl*4 - sizeof(struct iphdr)); |
200 | err = ip_clear_mutable_options(top_iph, &top_iph->daddr); |
201 | if (err) |
202 | goto out_free; |
203 | } |
204 | |
205 | ah->nexthdr = *skb_mac_header(skb); |
206 | *skb_mac_header(skb) = IPPROTO_AH; |
207 | |
208 | top_iph->tos = 0; |
209 | top_iph->tot_len = htons(skb->len); |
210 | top_iph->frag_off = 0; |
211 | top_iph->ttl = 0; |
212 | top_iph->check = 0; |
213 | |
214 | if (x->props.flags & XFRM_STATE_ALIGN4) |
215 | ah->hdrlen = (XFRM_ALIGN4(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2; |
216 | else |
217 | ah->hdrlen = (XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2; |
218 | |
219 | ah->reserved = 0; |
220 | ah->spi = x->id.spi; |
221 | ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); |
222 | |
223 | sg_init_table(sg, nfrags + sglists); |
224 | err = skb_to_sgvec_nomark(skb, sg, 0, skb->len); |
225 | if (unlikely(err < 0)) |
226 | goto out_free; |
227 | |
228 | if (x->props.flags & XFRM_STATE_ESN) { |
229 | /* Attach seqhi sg right after packet payload */ |
230 | *seqhi = htonl(XFRM_SKB_CB(skb)->seq.output.hi); |
231 | sg_set_buf(seqhisg, seqhi, seqhi_len); |
232 | } |
233 | ahash_request_set_crypt(req, sg, icv, skb->len + seqhi_len); |
234 | ahash_request_set_callback(req, 0, ah_output_done, skb); |
235 | |
236 | AH_SKB_CB(skb)->tmp = iph; |
237 | |
238 | err = crypto_ahash_digest(req); |
239 | if (err) { |
240 | if (err == -EINPROGRESS) |
241 | goto out; |
242 | |
243 | if (err == -ENOSPC) |
244 | err = NET_XMIT_DROP; |
245 | goto out_free; |
246 | } |
247 | |
248 | memcpy(ah->auth_data, icv, ahp->icv_trunc_len); |
249 | |
250 | top_iph->tos = iph->tos; |
251 | top_iph->ttl = iph->ttl; |
252 | top_iph->frag_off = iph->frag_off; |
253 | if (top_iph->ihl != 5) { |
254 | top_iph->daddr = iph->daddr; |
255 | memcpy(top_iph+1, iph+1, top_iph->ihl*4 - sizeof(struct iphdr)); |
256 | } |
257 | |
258 | out_free: |
259 | kfree(iph); |
260 | out: |
261 | return err; |
262 | } |
263 | |
264 | static void ah_input_done(struct crypto_async_request *base, int err) |
265 | { |
266 | u8 *auth_data; |
267 | u8 *icv; |
268 | struct iphdr *work_iph; |
269 | struct sk_buff *skb = base->data; |
270 | struct xfrm_state *x = xfrm_input_state(skb); |
271 | struct ah_data *ahp = x->data; |
272 | struct ip_auth_hdr *ah = ip_auth_hdr(skb); |
273 | int ihl = ip_hdrlen(skb); |
274 | int ah_hlen = (ah->hdrlen + 2) << 2; |
275 | |
276 | if (err) |
277 | goto out; |
278 | |
279 | work_iph = AH_SKB_CB(skb)->tmp; |
280 | auth_data = ah_tmp_auth(work_iph, ihl); |
281 | icv = ah_tmp_icv(ahp->ahash, auth_data, ahp->icv_trunc_len); |
282 | |
283 | err = crypto_memneq(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG : 0; |
284 | if (err) |
285 | goto out; |
286 | |
287 | err = ah->nexthdr; |
288 | |
289 | skb->network_header += ah_hlen; |
290 | memcpy(skb_network_header(skb), work_iph, ihl); |
291 | __skb_pull(skb, ah_hlen + ihl); |
292 | |
293 | if (x->props.mode == XFRM_MODE_TUNNEL) |
294 | skb_reset_transport_header(skb); |
295 | else |
296 | skb_set_transport_header(skb, -ihl); |
297 | out: |
298 | kfree(AH_SKB_CB(skb)->tmp); |
299 | xfrm_input_resume(skb, err); |
300 | } |
301 | |
302 | static int ah_input(struct xfrm_state *x, struct sk_buff *skb) |
303 | { |
304 | int ah_hlen; |
305 | int ihl; |
306 | int nexthdr; |
307 | int nfrags; |
308 | u8 *auth_data; |
309 | u8 *icv; |
310 | struct sk_buff *trailer; |
311 | struct crypto_ahash *ahash; |
312 | struct ahash_request *req; |
313 | struct scatterlist *sg; |
314 | struct iphdr *iph, *work_iph; |
315 | struct ip_auth_hdr *ah; |
316 | struct ah_data *ahp; |
317 | int err = -ENOMEM; |
318 | int seqhi_len = 0; |
319 | __be32 *seqhi; |
320 | int sglists = 0; |
321 | struct scatterlist *seqhisg; |
322 | |
323 | if (!pskb_may_pull(skb, sizeof(*ah))) |
324 | goto out; |
325 | |
326 | ah = (struct ip_auth_hdr *)skb->data; |
327 | ahp = x->data; |
328 | ahash = ahp->ahash; |
329 | |
330 | nexthdr = ah->nexthdr; |
331 | ah_hlen = (ah->hdrlen + 2) << 2; |
332 | |
333 | if (x->props.flags & XFRM_STATE_ALIGN4) { |
334 | if (ah_hlen != XFRM_ALIGN4(sizeof(*ah) + ahp->icv_full_len) && |
335 | ah_hlen != XFRM_ALIGN4(sizeof(*ah) + ahp->icv_trunc_len)) |
336 | goto out; |
337 | } else { |
338 | if (ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_full_len) && |
339 | ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len)) |
340 | goto out; |
341 | } |
342 | |
343 | if (!pskb_may_pull(skb, ah_hlen)) |
344 | goto out; |
345 | |
346 | /* We are going to _remove_ AH header to keep sockets happy, |
347 | * so... Later this can change. */ |
348 | if (skb_unclone(skb, GFP_ATOMIC)) |
349 | goto out; |
350 | |
351 | skb->ip_summed = CHECKSUM_NONE; |
352 | |
353 | |
354 | if ((err = skb_cow_data(skb, 0, &trailer)) < 0) |
355 | goto out; |
356 | nfrags = err; |
357 | |
358 | ah = (struct ip_auth_hdr *)skb->data; |
359 | iph = ip_hdr(skb); |
360 | ihl = ip_hdrlen(skb); |
361 | |
362 | if (x->props.flags & XFRM_STATE_ESN) { |
363 | sglists = 1; |
364 | seqhi_len = sizeof(*seqhi); |
365 | } |
366 | |
367 | work_iph = ah_alloc_tmp(ahash, nfrags + sglists, ihl + |
368 | ahp->icv_trunc_len + seqhi_len); |
369 | if (!work_iph) { |
370 | err = -ENOMEM; |
371 | goto out; |
372 | } |
373 | |
374 | seqhi = (__be32 *)((char *)work_iph + ihl); |
375 | auth_data = ah_tmp_auth(seqhi, seqhi_len); |
376 | icv = ah_tmp_icv(ahash, auth_data, ahp->icv_trunc_len); |
377 | req = ah_tmp_req(ahash, icv); |
378 | sg = ah_req_sg(ahash, req); |
379 | seqhisg = sg + nfrags; |
380 | |
381 | memcpy(work_iph, iph, ihl); |
382 | memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len); |
383 | memset(ah->auth_data, 0, ahp->icv_trunc_len); |
384 | |
385 | iph->ttl = 0; |
386 | iph->tos = 0; |
387 | iph->frag_off = 0; |
388 | iph->check = 0; |
389 | if (ihl > sizeof(*iph)) { |
390 | __be32 dummy; |
391 | err = ip_clear_mutable_options(iph, &dummy); |
392 | if (err) |
393 | goto out_free; |
394 | } |
395 | |
396 | skb_push(skb, ihl); |
397 | |
398 | sg_init_table(sg, nfrags + sglists); |
399 | err = skb_to_sgvec_nomark(skb, sg, 0, skb->len); |
400 | if (unlikely(err < 0)) |
401 | goto out_free; |
402 | |
403 | if (x->props.flags & XFRM_STATE_ESN) { |
404 | /* Attach seqhi sg right after packet payload */ |
405 | *seqhi = XFRM_SKB_CB(skb)->seq.input.hi; |
406 | sg_set_buf(seqhisg, seqhi, seqhi_len); |
407 | } |
408 | ahash_request_set_crypt(req, sg, icv, skb->len + seqhi_len); |
409 | ahash_request_set_callback(req, 0, ah_input_done, skb); |
410 | |
411 | AH_SKB_CB(skb)->tmp = work_iph; |
412 | |
413 | err = crypto_ahash_digest(req); |
414 | if (err) { |
415 | if (err == -EINPROGRESS) |
416 | goto out; |
417 | |
418 | goto out_free; |
419 | } |
420 | |
421 | err = crypto_memneq(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG : 0; |
422 | if (err) |
423 | goto out_free; |
424 | |
425 | skb->network_header += ah_hlen; |
426 | memcpy(skb_network_header(skb), work_iph, ihl); |
427 | __skb_pull(skb, ah_hlen + ihl); |
428 | if (x->props.mode == XFRM_MODE_TUNNEL) |
429 | skb_reset_transport_header(skb); |
430 | else |
431 | skb_set_transport_header(skb, -ihl); |
432 | |
433 | err = nexthdr; |
434 | |
435 | out_free: |
436 | kfree (work_iph); |
437 | out: |
438 | return err; |
439 | } |
440 | |
441 | static int ah4_err(struct sk_buff *skb, u32 info) |
442 | { |
443 | struct net *net = dev_net(skb->dev); |
444 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
445 | struct ip_auth_hdr *ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2)); |
446 | struct xfrm_state *x; |
447 | |
448 | switch (icmp_hdr(skb)->type) { |
449 | case ICMP_DEST_UNREACH: |
450 | if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) |
451 | return 0; |
452 | case ICMP_REDIRECT: |
453 | break; |
454 | default: |
455 | return 0; |
456 | } |
457 | |
458 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, |
459 | ah->spi, IPPROTO_AH, AF_INET); |
460 | if (!x) |
461 | return 0; |
462 | |
463 | if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) |
464 | ipv4_update_pmtu(skb, net, info, 0, IPPROTO_AH); |
465 | else |
466 | ipv4_redirect(skb, net, 0, IPPROTO_AH); |
467 | xfrm_state_put(x); |
468 | |
469 | return 0; |
470 | } |
471 | |
472 | static int ah_init_state(struct xfrm_state *x) |
473 | { |
474 | struct ah_data *ahp = NULL; |
475 | struct xfrm_algo_desc *aalg_desc; |
476 | struct crypto_ahash *ahash; |
477 | |
478 | if (!x->aalg) |
479 | goto error; |
480 | |
481 | if (x->encap) |
482 | goto error; |
483 | |
484 | ahp = kzalloc(sizeof(*ahp), GFP_KERNEL); |
485 | if (!ahp) |
486 | return -ENOMEM; |
487 | |
488 | ahash = crypto_alloc_ahash(x->aalg->alg_name, 0, 0); |
489 | if (IS_ERR(ahash)) |
490 | goto error; |
491 | |
492 | ahp->ahash = ahash; |
493 | if (crypto_ahash_setkey(ahash, x->aalg->alg_key, |
494 | (x->aalg->alg_key_len + 7) / 8)) |
495 | goto error; |
496 | |
497 | /* |
498 | * Lookup the algorithm description maintained by xfrm_algo, |
499 | * verify crypto transform properties, and store information |
500 | * we need for AH processing. This lookup cannot fail here |
501 | * after a successful crypto_alloc_ahash(). |
502 | */ |
503 | aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); |
504 | BUG_ON(!aalg_desc); |
505 | |
506 | if (aalg_desc->uinfo.auth.icv_fullbits/8 != |
507 | crypto_ahash_digestsize(ahash)) { |
508 | pr_info("%s: %s digestsize %u != %hu\n" , |
509 | __func__, x->aalg->alg_name, |
510 | crypto_ahash_digestsize(ahash), |
511 | aalg_desc->uinfo.auth.icv_fullbits / 8); |
512 | goto error; |
513 | } |
514 | |
515 | ahp->icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8; |
516 | ahp->icv_trunc_len = x->aalg->alg_trunc_len/8; |
517 | |
518 | if (x->props.flags & XFRM_STATE_ALIGN4) |
519 | x->props.header_len = XFRM_ALIGN4(sizeof(struct ip_auth_hdr) + |
520 | ahp->icv_trunc_len); |
521 | else |
522 | x->props.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) + |
523 | ahp->icv_trunc_len); |
524 | if (x->props.mode == XFRM_MODE_TUNNEL) |
525 | x->props.header_len += sizeof(struct iphdr); |
526 | x->data = ahp; |
527 | |
528 | return 0; |
529 | |
530 | error: |
531 | if (ahp) { |
532 | crypto_free_ahash(ahp->ahash); |
533 | kfree(ahp); |
534 | } |
535 | return -EINVAL; |
536 | } |
537 | |
538 | static void ah_destroy(struct xfrm_state *x) |
539 | { |
540 | struct ah_data *ahp = x->data; |
541 | |
542 | if (!ahp) |
543 | return; |
544 | |
545 | crypto_free_ahash(ahp->ahash); |
546 | kfree(ahp); |
547 | } |
548 | |
549 | static int ah4_rcv_cb(struct sk_buff *skb, int err) |
550 | { |
551 | return 0; |
552 | } |
553 | |
554 | static const struct xfrm_type ah_type = |
555 | { |
556 | .description = "AH4" , |
557 | .owner = THIS_MODULE, |
558 | .proto = IPPROTO_AH, |
559 | .flags = XFRM_TYPE_REPLAY_PROT, |
560 | .init_state = ah_init_state, |
561 | .destructor = ah_destroy, |
562 | .input = ah_input, |
563 | .output = ah_output |
564 | }; |
565 | |
566 | static struct xfrm4_protocol ah4_protocol = { |
567 | .handler = xfrm4_rcv, |
568 | .input_handler = xfrm_input, |
569 | .cb_handler = ah4_rcv_cb, |
570 | .err_handler = ah4_err, |
571 | .priority = 0, |
572 | }; |
573 | |
574 | static int __init ah4_init(void) |
575 | { |
576 | if (xfrm_register_type(&ah_type, AF_INET) < 0) { |
577 | pr_info("%s: can't add xfrm type\n" , __func__); |
578 | return -EAGAIN; |
579 | } |
580 | if (xfrm4_protocol_register(&ah4_protocol, IPPROTO_AH) < 0) { |
581 | pr_info("%s: can't add protocol\n" , __func__); |
582 | xfrm_unregister_type(&ah_type, AF_INET); |
583 | return -EAGAIN; |
584 | } |
585 | return 0; |
586 | } |
587 | |
588 | static void __exit ah4_fini(void) |
589 | { |
590 | if (xfrm4_protocol_deregister(&ah4_protocol, IPPROTO_AH) < 0) |
591 | pr_info("%s: can't remove protocol\n" , __func__); |
592 | if (xfrm_unregister_type(&ah_type, AF_INET) < 0) |
593 | pr_info("%s: can't remove xfrm type\n" , __func__); |
594 | } |
595 | |
596 | module_init(ah4_init); |
597 | module_exit(ah4_fini); |
598 | MODULE_LICENSE("GPL" ); |
599 | MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_AH); |
600 | |