1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * xfrm_input.c |
4 | * |
5 | * Changes: |
6 | * YOSHIFUJI Hideaki @USAGI |
7 | * Split up af-specific portion |
8 | * |
9 | */ |
10 | |
11 | #include <linux/bottom_half.h> |
12 | #include <linux/cache.h> |
13 | #include <linux/interrupt.h> |
14 | #include <linux/slab.h> |
15 | #include <linux/module.h> |
16 | #include <linux/netdevice.h> |
17 | #include <linux/percpu.h> |
18 | #include <net/dst.h> |
19 | #include <net/ip.h> |
20 | #include <net/xfrm.h> |
21 | #include <net/ip_tunnels.h> |
22 | #include <net/ip6_tunnel.h> |
23 | #include <net/dst_metadata.h> |
24 | |
25 | #include "xfrm_inout.h" |
26 | |
27 | struct xfrm_trans_tasklet { |
28 | struct work_struct work; |
29 | spinlock_t queue_lock; |
30 | struct sk_buff_head queue; |
31 | }; |
32 | |
33 | struct xfrm_trans_cb { |
34 | union { |
35 | struct inet_skb_parm h4; |
36 | #if IS_ENABLED(CONFIG_IPV6) |
37 | struct inet6_skb_parm h6; |
38 | #endif |
39 | } ; |
40 | int (*finish)(struct net *net, struct sock *sk, struct sk_buff *skb); |
41 | struct net *net; |
42 | }; |
43 | |
44 | #define XFRM_TRANS_SKB_CB(__skb) ((struct xfrm_trans_cb *)&((__skb)->cb[0])) |
45 | |
46 | static DEFINE_SPINLOCK(xfrm_input_afinfo_lock); |
47 | static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[2][AF_INET6 + 1]; |
48 | |
49 | static struct gro_cells gro_cells; |
50 | static struct net_device xfrm_napi_dev; |
51 | |
52 | static DEFINE_PER_CPU(struct xfrm_trans_tasklet, xfrm_trans_tasklet); |
53 | |
54 | int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo) |
55 | { |
56 | int err = 0; |
57 | |
58 | if (WARN_ON(afinfo->family > AF_INET6)) |
59 | return -EAFNOSUPPORT; |
60 | |
61 | spin_lock_bh(lock: &xfrm_input_afinfo_lock); |
62 | if (unlikely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family])) |
63 | err = -EEXIST; |
64 | else |
65 | rcu_assign_pointer(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family], afinfo); |
66 | spin_unlock_bh(lock: &xfrm_input_afinfo_lock); |
67 | return err; |
68 | } |
69 | EXPORT_SYMBOL(xfrm_input_register_afinfo); |
70 | |
71 | int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo) |
72 | { |
73 | int err = 0; |
74 | |
75 | spin_lock_bh(lock: &xfrm_input_afinfo_lock); |
76 | if (likely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family])) { |
77 | if (unlikely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family] != afinfo)) |
78 | err = -EINVAL; |
79 | else |
80 | RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family], NULL); |
81 | } |
82 | spin_unlock_bh(lock: &xfrm_input_afinfo_lock); |
83 | synchronize_rcu(); |
84 | return err; |
85 | } |
86 | EXPORT_SYMBOL(xfrm_input_unregister_afinfo); |
87 | |
88 | static const struct xfrm_input_afinfo *xfrm_input_get_afinfo(u8 family, bool is_ipip) |
89 | { |
90 | const struct xfrm_input_afinfo *afinfo; |
91 | |
92 | if (WARN_ON_ONCE(family > AF_INET6)) |
93 | return NULL; |
94 | |
95 | rcu_read_lock(); |
96 | afinfo = rcu_dereference(xfrm_input_afinfo[is_ipip][family]); |
97 | if (unlikely(!afinfo)) |
98 | rcu_read_unlock(); |
99 | return afinfo; |
100 | } |
101 | |
102 | static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol, |
103 | int err) |
104 | { |
105 | bool is_ipip = (protocol == IPPROTO_IPIP || protocol == IPPROTO_IPV6); |
106 | const struct xfrm_input_afinfo *afinfo; |
107 | int ret; |
108 | |
109 | afinfo = xfrm_input_get_afinfo(family, is_ipip); |
110 | if (!afinfo) |
111 | return -EAFNOSUPPORT; |
112 | |
113 | ret = afinfo->callback(skb, protocol, err); |
114 | rcu_read_unlock(); |
115 | |
116 | return ret; |
117 | } |
118 | |
119 | struct sec_path *secpath_set(struct sk_buff *skb) |
120 | { |
121 | struct sec_path *sp, *tmp = skb_ext_find(skb, id: SKB_EXT_SEC_PATH); |
122 | |
123 | sp = skb_ext_add(skb, id: SKB_EXT_SEC_PATH); |
124 | if (!sp) |
125 | return NULL; |
126 | |
127 | if (tmp) /* reused existing one (was COW'd if needed) */ |
128 | return sp; |
129 | |
130 | /* allocated new secpath */ |
131 | memset(sp->ovec, 0, sizeof(sp->ovec)); |
132 | sp->olen = 0; |
133 | sp->len = 0; |
134 | sp->verified_cnt = 0; |
135 | |
136 | return sp; |
137 | } |
138 | EXPORT_SYMBOL(secpath_set); |
139 | |
140 | /* Fetch spi and seq from ipsec header */ |
141 | |
142 | int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq) |
143 | { |
144 | int offset, offset_seq; |
145 | int hlen; |
146 | |
147 | switch (nexthdr) { |
148 | case IPPROTO_AH: |
149 | hlen = sizeof(struct ip_auth_hdr); |
150 | offset = offsetof(struct ip_auth_hdr, spi); |
151 | offset_seq = offsetof(struct ip_auth_hdr, seq_no); |
152 | break; |
153 | case IPPROTO_ESP: |
154 | hlen = sizeof(struct ip_esp_hdr); |
155 | offset = offsetof(struct ip_esp_hdr, spi); |
156 | offset_seq = offsetof(struct ip_esp_hdr, seq_no); |
157 | break; |
158 | case IPPROTO_COMP: |
159 | if (!pskb_may_pull(skb, len: sizeof(struct ip_comp_hdr))) |
160 | return -EINVAL; |
161 | *spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2))); |
162 | *seq = 0; |
163 | return 0; |
164 | default: |
165 | return 1; |
166 | } |
167 | |
168 | if (!pskb_may_pull(skb, len: hlen)) |
169 | return -EINVAL; |
170 | |
171 | *spi = *(__be32 *)(skb_transport_header(skb) + offset); |
172 | *seq = *(__be32 *)(skb_transport_header(skb) + offset_seq); |
173 | return 0; |
174 | } |
175 | EXPORT_SYMBOL(xfrm_parse_spi); |
176 | |
177 | static int xfrm4_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb) |
178 | { |
179 | struct iphdr *iph; |
180 | int optlen = 0; |
181 | int err = -EINVAL; |
182 | |
183 | skb->protocol = htons(ETH_P_IP); |
184 | |
185 | if (unlikely(XFRM_MODE_SKB_CB(skb)->protocol == IPPROTO_BEETPH)) { |
186 | struct ip_beet_phdr *ph; |
187 | int phlen; |
188 | |
189 | if (!pskb_may_pull(skb, len: sizeof(*ph))) |
190 | goto out; |
191 | |
192 | ph = (struct ip_beet_phdr *)skb->data; |
193 | |
194 | phlen = sizeof(*ph) + ph->padlen; |
195 | optlen = ph->hdrlen * 8 + (IPV4_BEET_PHMAXLEN - phlen); |
196 | if (optlen < 0 || optlen & 3 || optlen > 250) |
197 | goto out; |
198 | |
199 | XFRM_MODE_SKB_CB(skb)->protocol = ph->nexthdr; |
200 | |
201 | if (!pskb_may_pull(skb, len: phlen)) |
202 | goto out; |
203 | __skb_pull(skb, len: phlen); |
204 | } |
205 | |
206 | skb_push(skb, len: sizeof(*iph)); |
207 | skb_reset_network_header(skb); |
208 | skb_mac_header_rebuild(skb); |
209 | |
210 | xfrm4_beet_make_header(skb); |
211 | |
212 | iph = ip_hdr(skb); |
213 | |
214 | iph->ihl += optlen / 4; |
215 | iph->tot_len = htons(skb->len); |
216 | iph->daddr = x->sel.daddr.a4; |
217 | iph->saddr = x->sel.saddr.a4; |
218 | iph->check = 0; |
219 | iph->check = ip_fast_csum(iph: skb_network_header(skb), ihl: iph->ihl); |
220 | err = 0; |
221 | out: |
222 | return err; |
223 | } |
224 | |
225 | static void ipip_ecn_decapsulate(struct sk_buff *skb) |
226 | { |
227 | struct iphdr *inner_iph = ipip_hdr(skb); |
228 | |
229 | if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos)) |
230 | IP_ECN_set_ce(iph: inner_iph); |
231 | } |
232 | |
233 | static int xfrm4_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb) |
234 | { |
235 | int err = -EINVAL; |
236 | |
237 | skb->protocol = htons(ETH_P_IP); |
238 | |
239 | if (!pskb_may_pull(skb, len: sizeof(struct iphdr))) |
240 | goto out; |
241 | |
242 | err = skb_unclone(skb, GFP_ATOMIC); |
243 | if (err) |
244 | goto out; |
245 | |
246 | if (x->props.flags & XFRM_STATE_DECAP_DSCP) |
247 | ipv4_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, inner: ipip_hdr(skb)); |
248 | if (!(x->props.flags & XFRM_STATE_NOECN)) |
249 | ipip_ecn_decapsulate(skb); |
250 | |
251 | skb_reset_network_header(skb); |
252 | skb_mac_header_rebuild(skb); |
253 | if (skb->mac_len) |
254 | eth_hdr(skb)->h_proto = skb->protocol; |
255 | |
256 | err = 0; |
257 | |
258 | out: |
259 | return err; |
260 | } |
261 | |
262 | static void ipip6_ecn_decapsulate(struct sk_buff *skb) |
263 | { |
264 | struct ipv6hdr *inner_iph = ipipv6_hdr(skb); |
265 | |
266 | if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos)) |
267 | IP6_ECN_set_ce(skb, iph: inner_iph); |
268 | } |
269 | |
270 | static int xfrm6_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb) |
271 | { |
272 | int err = -EINVAL; |
273 | |
274 | skb->protocol = htons(ETH_P_IPV6); |
275 | |
276 | if (!pskb_may_pull(skb, len: sizeof(struct ipv6hdr))) |
277 | goto out; |
278 | |
279 | err = skb_unclone(skb, GFP_ATOMIC); |
280 | if (err) |
281 | goto out; |
282 | |
283 | if (x->props.flags & XFRM_STATE_DECAP_DSCP) |
284 | ipv6_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, inner: ipipv6_hdr(skb)); |
285 | if (!(x->props.flags & XFRM_STATE_NOECN)) |
286 | ipip6_ecn_decapsulate(skb); |
287 | |
288 | skb_reset_network_header(skb); |
289 | skb_mac_header_rebuild(skb); |
290 | if (skb->mac_len) |
291 | eth_hdr(skb)->h_proto = skb->protocol; |
292 | |
293 | err = 0; |
294 | |
295 | out: |
296 | return err; |
297 | } |
298 | |
299 | static int xfrm6_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb) |
300 | { |
301 | struct ipv6hdr *ip6h; |
302 | int size = sizeof(struct ipv6hdr); |
303 | int err; |
304 | |
305 | skb->protocol = htons(ETH_P_IPV6); |
306 | |
307 | err = skb_cow_head(skb, headroom: size + skb->mac_len); |
308 | if (err) |
309 | goto out; |
310 | |
311 | __skb_push(skb, len: size); |
312 | skb_reset_network_header(skb); |
313 | skb_mac_header_rebuild(skb); |
314 | |
315 | xfrm6_beet_make_header(skb); |
316 | |
317 | ip6h = ipv6_hdr(skb); |
318 | ip6h->payload_len = htons(skb->len - size); |
319 | ip6h->daddr = x->sel.daddr.in6; |
320 | ip6h->saddr = x->sel.saddr.in6; |
321 | err = 0; |
322 | out: |
323 | return err; |
324 | } |
325 | |
326 | /* Remove encapsulation header. |
327 | * |
328 | * The IP header will be moved over the top of the encapsulation |
329 | * header. |
330 | * |
331 | * On entry, the transport header shall point to where the IP header |
332 | * should be and the network header shall be set to where the IP |
333 | * header currently is. skb->data shall point to the start of the |
334 | * payload. |
335 | */ |
336 | static int |
337 | xfrm_inner_mode_encap_remove(struct xfrm_state *x, |
338 | struct sk_buff *skb) |
339 | { |
340 | switch (x->props.mode) { |
341 | case XFRM_MODE_BEET: |
342 | switch (x->sel.family) { |
343 | case AF_INET: |
344 | return xfrm4_remove_beet_encap(x, skb); |
345 | case AF_INET6: |
346 | return xfrm6_remove_beet_encap(x, skb); |
347 | } |
348 | break; |
349 | case XFRM_MODE_TUNNEL: |
350 | switch (XFRM_MODE_SKB_CB(skb)->protocol) { |
351 | case IPPROTO_IPIP: |
352 | return xfrm4_remove_tunnel_encap(x, skb); |
353 | case IPPROTO_IPV6: |
354 | return xfrm6_remove_tunnel_encap(x, skb); |
355 | break; |
356 | } |
357 | return -EINVAL; |
358 | } |
359 | |
360 | WARN_ON_ONCE(1); |
361 | return -EOPNOTSUPP; |
362 | } |
363 | |
364 | static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb) |
365 | { |
366 | switch (x->props.family) { |
367 | case AF_INET: |
368 | xfrm4_extract_header(skb); |
369 | break; |
370 | case AF_INET6: |
371 | xfrm6_extract_header(skb); |
372 | break; |
373 | default: |
374 | WARN_ON_ONCE(1); |
375 | return -EAFNOSUPPORT; |
376 | } |
377 | |
378 | return xfrm_inner_mode_encap_remove(x, skb); |
379 | } |
380 | |
381 | /* Remove encapsulation header. |
382 | * |
383 | * The IP header will be moved over the top of the encapsulation header. |
384 | * |
385 | * On entry, skb_transport_header() shall point to where the IP header |
386 | * should be and skb_network_header() shall be set to where the IP header |
387 | * currently is. skb->data shall point to the start of the payload. |
388 | */ |
389 | static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb) |
390 | { |
391 | int ihl = skb->data - skb_transport_header(skb); |
392 | |
393 | if (skb->transport_header != skb->network_header) { |
394 | memmove(skb_transport_header(skb), |
395 | skb_network_header(skb), ihl); |
396 | skb->network_header = skb->transport_header; |
397 | } |
398 | ip_hdr(skb)->tot_len = htons(skb->len + ihl); |
399 | skb_reset_transport_header(skb); |
400 | return 0; |
401 | } |
402 | |
403 | static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb) |
404 | { |
405 | #if IS_ENABLED(CONFIG_IPV6) |
406 | int ihl = skb->data - skb_transport_header(skb); |
407 | |
408 | if (skb->transport_header != skb->network_header) { |
409 | memmove(skb_transport_header(skb), |
410 | skb_network_header(skb), ihl); |
411 | skb->network_header = skb->transport_header; |
412 | } |
413 | ipv6_hdr(skb)->payload_len = htons(skb->len + ihl - |
414 | sizeof(struct ipv6hdr)); |
415 | skb_reset_transport_header(skb); |
416 | return 0; |
417 | #else |
418 | WARN_ON_ONCE(1); |
419 | return -EAFNOSUPPORT; |
420 | #endif |
421 | } |
422 | |
423 | static int xfrm_inner_mode_input(struct xfrm_state *x, |
424 | struct sk_buff *skb) |
425 | { |
426 | switch (x->props.mode) { |
427 | case XFRM_MODE_BEET: |
428 | case XFRM_MODE_TUNNEL: |
429 | return xfrm_prepare_input(x, skb); |
430 | case XFRM_MODE_TRANSPORT: |
431 | if (x->props.family == AF_INET) |
432 | return xfrm4_transport_input(x, skb); |
433 | if (x->props.family == AF_INET6) |
434 | return xfrm6_transport_input(x, skb); |
435 | break; |
436 | case XFRM_MODE_ROUTEOPTIMIZATION: |
437 | WARN_ON_ONCE(1); |
438 | break; |
439 | default: |
440 | WARN_ON_ONCE(1); |
441 | break; |
442 | } |
443 | |
444 | return -EOPNOTSUPP; |
445 | } |
446 | |
447 | int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) |
448 | { |
449 | const struct xfrm_state_afinfo *afinfo; |
450 | struct net *net = dev_net(dev: skb->dev); |
451 | int err; |
452 | __be32 seq; |
453 | __be32 seq_hi; |
454 | struct xfrm_state *x = NULL; |
455 | xfrm_address_t *daddr; |
456 | u32 mark = skb->mark; |
457 | unsigned int family = AF_UNSPEC; |
458 | int decaps = 0; |
459 | int async = 0; |
460 | bool xfrm_gro = false; |
461 | bool crypto_done = false; |
462 | struct xfrm_offload *xo = xfrm_offload(skb); |
463 | struct sec_path *sp; |
464 | |
465 | if (encap_type < 0 || (xo && xo->flags & XFRM_GRO)) { |
466 | x = xfrm_input_state(skb); |
467 | |
468 | if (unlikely(x->km.state != XFRM_STATE_VALID)) { |
469 | if (x->km.state == XFRM_STATE_ACQ) |
470 | XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR); |
471 | else |
472 | XFRM_INC_STATS(net, |
473 | LINUX_MIB_XFRMINSTATEINVALID); |
474 | |
475 | if (encap_type == -1) |
476 | dev_put(dev: skb->dev); |
477 | goto drop; |
478 | } |
479 | |
480 | family = x->props.family; |
481 | |
482 | /* An encap_type of -1 indicates async resumption. */ |
483 | if (encap_type == -1) { |
484 | async = 1; |
485 | seq = XFRM_SKB_CB(skb)->seq.input.low; |
486 | goto resume; |
487 | } |
488 | /* GRO call */ |
489 | seq = XFRM_SPI_SKB_CB(skb)->seq; |
490 | |
491 | if (xo && (xo->flags & CRYPTO_DONE)) { |
492 | crypto_done = true; |
493 | family = XFRM_SPI_SKB_CB(skb)->family; |
494 | |
495 | if (!(xo->status & CRYPTO_SUCCESS)) { |
496 | if (xo->status & |
497 | (CRYPTO_TRANSPORT_AH_AUTH_FAILED | |
498 | CRYPTO_TRANSPORT_ESP_AUTH_FAILED | |
499 | CRYPTO_TUNNEL_AH_AUTH_FAILED | |
500 | CRYPTO_TUNNEL_ESP_AUTH_FAILED)) { |
501 | |
502 | xfrm_audit_state_icvfail(x, skb, |
503 | proto: x->type->proto); |
504 | x->stats.integrity_failed++; |
505 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); |
506 | goto drop; |
507 | } |
508 | |
509 | if (xo->status & CRYPTO_INVALID_PROTOCOL) { |
510 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); |
511 | goto drop; |
512 | } |
513 | |
514 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
515 | goto drop; |
516 | } |
517 | |
518 | if (xfrm_parse_spi(skb, nexthdr, &spi, &seq)) { |
519 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
520 | goto drop; |
521 | } |
522 | } |
523 | |
524 | goto lock; |
525 | } |
526 | |
527 | family = XFRM_SPI_SKB_CB(skb)->family; |
528 | |
529 | /* if tunnel is present override skb->mark value with tunnel i_key */ |
530 | switch (family) { |
531 | case AF_INET: |
532 | if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) |
533 | mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key); |
534 | break; |
535 | case AF_INET6: |
536 | if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) |
537 | mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key); |
538 | break; |
539 | } |
540 | |
541 | sp = secpath_set(skb); |
542 | if (!sp) { |
543 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); |
544 | goto drop; |
545 | } |
546 | |
547 | seq = 0; |
548 | if (!spi && xfrm_parse_spi(skb, nexthdr, &spi, &seq)) { |
549 | secpath_reset(skb); |
550 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
551 | goto drop; |
552 | } |
553 | |
554 | daddr = (xfrm_address_t *)(skb_network_header(skb) + |
555 | XFRM_SPI_SKB_CB(skb)->daddroff); |
556 | do { |
557 | sp = skb_sec_path(skb); |
558 | |
559 | if (sp->len == XFRM_MAX_DEPTH) { |
560 | secpath_reset(skb); |
561 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
562 | goto drop; |
563 | } |
564 | |
565 | x = xfrm_state_lookup(net, mark, daddr, spi, proto: nexthdr, family); |
566 | if (x == NULL) { |
567 | secpath_reset(skb); |
568 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES); |
569 | xfrm_audit_state_notfound(skb, family, net_spi: spi, net_seq: seq); |
570 | goto drop; |
571 | } |
572 | |
573 | skb->mark = xfrm_smark_get(mark: skb->mark, x); |
574 | |
575 | sp->xvec[sp->len++] = x; |
576 | |
577 | skb_dst_force(skb); |
578 | if (!skb_dst(skb)) { |
579 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); |
580 | goto drop; |
581 | } |
582 | |
583 | lock: |
584 | spin_lock(lock: &x->lock); |
585 | |
586 | if (unlikely(x->km.state != XFRM_STATE_VALID)) { |
587 | if (x->km.state == XFRM_STATE_ACQ) |
588 | XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR); |
589 | else |
590 | XFRM_INC_STATS(net, |
591 | LINUX_MIB_XFRMINSTATEINVALID); |
592 | goto drop_unlock; |
593 | } |
594 | |
595 | if ((x->encap ? x->encap->encap_type : 0) != encap_type) { |
596 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); |
597 | goto drop_unlock; |
598 | } |
599 | |
600 | if (xfrm_replay_check(x, skb, net_seq: seq)) { |
601 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); |
602 | goto drop_unlock; |
603 | } |
604 | |
605 | if (xfrm_state_check_expire(x)) { |
606 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED); |
607 | goto drop_unlock; |
608 | } |
609 | |
610 | spin_unlock(lock: &x->lock); |
611 | |
612 | if (xfrm_tunnel_check(skb, x, family)) { |
613 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); |
614 | goto drop; |
615 | } |
616 | |
617 | seq_hi = htonl(xfrm_replay_seqhi(x, seq)); |
618 | |
619 | XFRM_SKB_CB(skb)->seq.input.low = seq; |
620 | XFRM_SKB_CB(skb)->seq.input.hi = seq_hi; |
621 | |
622 | dev_hold(dev: skb->dev); |
623 | |
624 | if (crypto_done) |
625 | nexthdr = x->type_offload->input_tail(x, skb); |
626 | else |
627 | nexthdr = x->type->input(x, skb); |
628 | |
629 | if (nexthdr == -EINPROGRESS) |
630 | return 0; |
631 | resume: |
632 | dev_put(dev: skb->dev); |
633 | |
634 | spin_lock(lock: &x->lock); |
635 | if (nexthdr < 0) { |
636 | if (nexthdr == -EBADMSG) { |
637 | xfrm_audit_state_icvfail(x, skb, |
638 | proto: x->type->proto); |
639 | x->stats.integrity_failed++; |
640 | } |
641 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); |
642 | goto drop_unlock; |
643 | } |
644 | |
645 | /* only the first xfrm gets the encap type */ |
646 | encap_type = 0; |
647 | |
648 | if (xfrm_replay_recheck(x, skb, net_seq: seq)) { |
649 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); |
650 | goto drop_unlock; |
651 | } |
652 | |
653 | xfrm_replay_advance(x, net_seq: seq); |
654 | |
655 | x->curlft.bytes += skb->len; |
656 | x->curlft.packets++; |
657 | x->lastused = ktime_get_real_seconds(); |
658 | |
659 | spin_unlock(lock: &x->lock); |
660 | |
661 | XFRM_MODE_SKB_CB(skb)->protocol = nexthdr; |
662 | |
663 | if (xfrm_inner_mode_input(x, skb)) { |
664 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); |
665 | goto drop; |
666 | } |
667 | |
668 | if (x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL) { |
669 | decaps = 1; |
670 | break; |
671 | } |
672 | |
673 | /* |
674 | * We need the inner address. However, we only get here for |
675 | * transport mode so the outer address is identical. |
676 | */ |
677 | daddr = &x->id.daddr; |
678 | family = x->props.family; |
679 | |
680 | err = xfrm_parse_spi(skb, nexthdr, &spi, &seq); |
681 | if (err < 0) { |
682 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
683 | goto drop; |
684 | } |
685 | crypto_done = false; |
686 | } while (!err); |
687 | |
688 | err = xfrm_rcv_cb(skb, family, protocol: x->type->proto, err: 0); |
689 | if (err) |
690 | goto drop; |
691 | |
692 | nf_reset_ct(skb); |
693 | |
694 | if (decaps) { |
695 | sp = skb_sec_path(skb); |
696 | if (sp) |
697 | sp->olen = 0; |
698 | if (skb_valid_dst(skb)) |
699 | skb_dst_drop(skb); |
700 | gro_cells_receive(gcells: &gro_cells, skb); |
701 | return 0; |
702 | } else { |
703 | xo = xfrm_offload(skb); |
704 | if (xo) |
705 | xfrm_gro = xo->flags & XFRM_GRO; |
706 | |
707 | err = -EAFNOSUPPORT; |
708 | rcu_read_lock(); |
709 | afinfo = xfrm_state_afinfo_get_rcu(family: x->props.family); |
710 | if (likely(afinfo)) |
711 | err = afinfo->transport_finish(skb, xfrm_gro || async); |
712 | rcu_read_unlock(); |
713 | if (xfrm_gro) { |
714 | sp = skb_sec_path(skb); |
715 | if (sp) |
716 | sp->olen = 0; |
717 | if (skb_valid_dst(skb)) |
718 | skb_dst_drop(skb); |
719 | gro_cells_receive(gcells: &gro_cells, skb); |
720 | return err; |
721 | } |
722 | |
723 | return err; |
724 | } |
725 | |
726 | drop_unlock: |
727 | spin_unlock(lock: &x->lock); |
728 | drop: |
729 | xfrm_rcv_cb(skb, family, protocol: x && x->type ? x->type->proto : nexthdr, err: -1); |
730 | kfree_skb(skb); |
731 | return 0; |
732 | } |
733 | EXPORT_SYMBOL(xfrm_input); |
734 | |
735 | int xfrm_input_resume(struct sk_buff *skb, int nexthdr) |
736 | { |
737 | return xfrm_input(skb, nexthdr, 0, -1); |
738 | } |
739 | EXPORT_SYMBOL(xfrm_input_resume); |
740 | |
741 | static void xfrm_trans_reinject(struct work_struct *work) |
742 | { |
743 | struct xfrm_trans_tasklet *trans = container_of(work, struct xfrm_trans_tasklet, work); |
744 | struct sk_buff_head queue; |
745 | struct sk_buff *skb; |
746 | |
747 | __skb_queue_head_init(list: &queue); |
748 | spin_lock_bh(lock: &trans->queue_lock); |
749 | skb_queue_splice_init(list: &trans->queue, head: &queue); |
750 | spin_unlock_bh(lock: &trans->queue_lock); |
751 | |
752 | local_bh_disable(); |
753 | while ((skb = __skb_dequeue(list: &queue))) |
754 | XFRM_TRANS_SKB_CB(skb)->finish(XFRM_TRANS_SKB_CB(skb)->net, |
755 | NULL, skb); |
756 | local_bh_enable(); |
757 | } |
758 | |
759 | int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, |
760 | int (*finish)(struct net *, struct sock *, |
761 | struct sk_buff *)) |
762 | { |
763 | struct xfrm_trans_tasklet *trans; |
764 | |
765 | trans = this_cpu_ptr(&xfrm_trans_tasklet); |
766 | |
767 | if (skb_queue_len(list_: &trans->queue) >= READ_ONCE(netdev_max_backlog)) |
768 | return -ENOBUFS; |
769 | |
770 | BUILD_BUG_ON(sizeof(struct xfrm_trans_cb) > sizeof(skb->cb)); |
771 | |
772 | XFRM_TRANS_SKB_CB(skb)->finish = finish; |
773 | XFRM_TRANS_SKB_CB(skb)->net = net; |
774 | spin_lock_bh(lock: &trans->queue_lock); |
775 | __skb_queue_tail(list: &trans->queue, newsk: skb); |
776 | spin_unlock_bh(lock: &trans->queue_lock); |
777 | schedule_work(work: &trans->work); |
778 | return 0; |
779 | } |
780 | EXPORT_SYMBOL(xfrm_trans_queue_net); |
781 | |
782 | int xfrm_trans_queue(struct sk_buff *skb, |
783 | int (*finish)(struct net *, struct sock *, |
784 | struct sk_buff *)) |
785 | { |
786 | return xfrm_trans_queue_net(dev_net(dev: skb->dev), skb, finish); |
787 | } |
788 | EXPORT_SYMBOL(xfrm_trans_queue); |
789 | |
790 | void __init xfrm_input_init(void) |
791 | { |
792 | int err; |
793 | int i; |
794 | |
795 | init_dummy_netdev(dev: &xfrm_napi_dev); |
796 | err = gro_cells_init(gcells: &gro_cells, dev: &xfrm_napi_dev); |
797 | if (err) |
798 | gro_cells.cells = NULL; |
799 | |
800 | for_each_possible_cpu(i) { |
801 | struct xfrm_trans_tasklet *trans; |
802 | |
803 | trans = &per_cpu(xfrm_trans_tasklet, i); |
804 | spin_lock_init(&trans->queue_lock); |
805 | __skb_queue_head_init(list: &trans->queue); |
806 | INIT_WORK(&trans->work, xfrm_trans_reinject); |
807 | } |
808 | } |
809 | |