Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * xfrm_input.c | |
4 | * | |
5 | * Changes: | |
6 | * YOSHIFUJI Hideaki @USAGI | |
7 | * Split up af-specific portion | |
a716c119 | 8 | * |
1da177e4 LT |
9 | */ |
10 | ||
acf568ee | 11 | #include <linux/bottom_half.h> |
f8c3d0dd | 12 | #include <linux/cache.h> |
acf568ee | 13 | #include <linux/interrupt.h> |
1da177e4 LT |
14 | #include <linux/slab.h> |
15 | #include <linux/module.h> | |
716062fd | 16 | #include <linux/netdevice.h> |
acf568ee | 17 | #include <linux/percpu.h> |
716062fd | 18 | #include <net/dst.h> |
1da177e4 LT |
19 | #include <net/ip.h> |
20 | #include <net/xfrm.h> | |
049f8e2e AD |
21 | #include <net/ip_tunnels.h> |
22 | #include <net/ip6_tunnel.h> | |
1da177e4 | 23 | |
b3284df1 FW |
24 | #include "xfrm_inout.h" |
25 | ||
acf568ee HX |
26 | struct xfrm_trans_tasklet { |
27 | struct tasklet_struct tasklet; | |
28 | struct sk_buff_head queue; | |
29 | }; | |
30 | ||
31 | struct xfrm_trans_cb { | |
9a3fb9fb SK |
32 | union { |
33 | struct inet_skb_parm h4; | |
34 | #if IS_ENABLED(CONFIG_IPV6) | |
35 | struct inet6_skb_parm h6; | |
36 | #endif | |
37 | } header; | |
acf568ee | 38 | int (*finish)(struct net *net, struct sock *sk, struct sk_buff *skb); |
7b380192 | 39 | struct net *net; |
acf568ee HX |
40 | }; |
41 | ||
42 | #define XFRM_TRANS_SKB_CB(__skb) ((struct xfrm_trans_cb *)&((__skb)->cb[0])) | |
43 | ||
2f32b51b | 44 | static DEFINE_SPINLOCK(xfrm_input_afinfo_lock); |
960fdfde | 45 | static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[AF_INET6 + 1]; |
2f32b51b | 46 | |
1995876a SK |
47 | static struct gro_cells gro_cells; |
48 | static struct net_device xfrm_napi_dev; | |
49 | ||
acf568ee HX |
50 | static DEFINE_PER_CPU(struct xfrm_trans_tasklet, xfrm_trans_tasklet); |
51 | ||
960fdfde | 52 | int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo) |
2f32b51b SK |
53 | { |
54 | int err = 0; | |
55 | ||
960fdfde | 56 | if (WARN_ON(afinfo->family >= ARRAY_SIZE(xfrm_input_afinfo))) |
2f32b51b | 57 | return -EAFNOSUPPORT; |
960fdfde | 58 | |
2f32b51b SK |
59 | spin_lock_bh(&xfrm_input_afinfo_lock); |
60 | if (unlikely(xfrm_input_afinfo[afinfo->family] != NULL)) | |
f31e8d4f | 61 | err = -EEXIST; |
2f32b51b SK |
62 | else |
63 | rcu_assign_pointer(xfrm_input_afinfo[afinfo->family], afinfo); | |
64 | spin_unlock_bh(&xfrm_input_afinfo_lock); | |
65 | return err; | |
66 | } | |
67 | EXPORT_SYMBOL(xfrm_input_register_afinfo); | |
68 | ||
960fdfde | 69 | int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo) |
2f32b51b SK |
70 | { |
71 | int err = 0; | |
72 | ||
2f32b51b SK |
73 | spin_lock_bh(&xfrm_input_afinfo_lock); |
74 | if (likely(xfrm_input_afinfo[afinfo->family] != NULL)) { | |
75 | if (unlikely(xfrm_input_afinfo[afinfo->family] != afinfo)) | |
76 | err = -EINVAL; | |
77 | else | |
78 | RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->family], NULL); | |
79 | } | |
80 | spin_unlock_bh(&xfrm_input_afinfo_lock); | |
81 | synchronize_rcu(); | |
82 | return err; | |
83 | } | |
84 | EXPORT_SYMBOL(xfrm_input_unregister_afinfo); | |
85 | ||
960fdfde | 86 | static const struct xfrm_input_afinfo *xfrm_input_get_afinfo(unsigned int family) |
2f32b51b | 87 | { |
960fdfde | 88 | const struct xfrm_input_afinfo *afinfo; |
2f32b51b | 89 | |
960fdfde | 90 | if (WARN_ON_ONCE(family >= ARRAY_SIZE(xfrm_input_afinfo))) |
2f32b51b | 91 | return NULL; |
960fdfde | 92 | |
2f32b51b SK |
93 | rcu_read_lock(); |
94 | afinfo = rcu_dereference(xfrm_input_afinfo[family]); | |
95 | if (unlikely(!afinfo)) | |
96 | rcu_read_unlock(); | |
97 | return afinfo; | |
98 | } | |
99 | ||
2f32b51b SK |
100 | static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol, |
101 | int err) | |
102 | { | |
103 | int ret; | |
960fdfde | 104 | const struct xfrm_input_afinfo *afinfo = xfrm_input_get_afinfo(family); |
2f32b51b SK |
105 | |
106 | if (!afinfo) | |
107 | return -EAFNOSUPPORT; | |
108 | ||
109 | ret = afinfo->callback(skb, protocol, err); | |
960fdfde | 110 | rcu_read_unlock(); |
2f32b51b SK |
111 | |
112 | return ret; | |
113 | } | |
114 | ||
4165079b | 115 | struct sec_path *secpath_set(struct sk_buff *skb) |
1da177e4 | 116 | { |
4165079b | 117 | struct sec_path *sp, *tmp = skb_ext_find(skb, SKB_EXT_SEC_PATH); |
1da177e4 | 118 | |
4165079b | 119 | sp = skb_ext_add(skb, SKB_EXT_SEC_PATH); |
1da177e4 LT |
120 | if (!sp) |
121 | return NULL; | |
122 | ||
4165079b FW |
123 | if (tmp) /* reused existing one (was COW'd if needed) */ |
124 | return sp; | |
54ef207a | 125 | |
4165079b | 126 | /* allocated new secpath */ |
f1193e91 | 127 | memset(sp->ovec, 0, sizeof(sp->ovec)); |
4165079b FW |
128 | sp->olen = 0; |
129 | sp->len = 0; | |
0ca64da1 FW |
130 | |
131 | return sp; | |
b0fcee82 SK |
132 | } |
133 | EXPORT_SYMBOL(secpath_set); | |
134 | ||
1da177e4 LT |
135 | /* Fetch spi and seq from ipsec header */ |
136 | ||
6067b2ba | 137 | int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq) |
1da177e4 LT |
138 | { |
139 | int offset, offset_seq; | |
44072500 | 140 | int hlen; |
1da177e4 LT |
141 | |
142 | switch (nexthdr) { | |
143 | case IPPROTO_AH: | |
44072500 | 144 | hlen = sizeof(struct ip_auth_hdr); |
1da177e4 LT |
145 | offset = offsetof(struct ip_auth_hdr, spi); |
146 | offset_seq = offsetof(struct ip_auth_hdr, seq_no); | |
147 | break; | |
148 | case IPPROTO_ESP: | |
44072500 | 149 | hlen = sizeof(struct ip_esp_hdr); |
1da177e4 LT |
150 | offset = offsetof(struct ip_esp_hdr, spi); |
151 | offset_seq = offsetof(struct ip_esp_hdr, seq_no); | |
152 | break; | |
153 | case IPPROTO_COMP: | |
154 | if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr))) | |
155 | return -EINVAL; | |
3e94c2dc | 156 | *spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2))); |
1da177e4 LT |
157 | *seq = 0; |
158 | return 0; | |
159 | default: | |
160 | return 1; | |
161 | } | |
162 | ||
44072500 | 163 | if (!pskb_may_pull(skb, hlen)) |
1da177e4 LT |
164 | return -EINVAL; |
165 | ||
3e94c2dc WC |
166 | *spi = *(__be32 *)(skb_transport_header(skb) + offset); |
167 | *seq = *(__be32 *)(skb_transport_header(skb) + offset_seq); | |
1da177e4 LT |
168 | return 0; |
169 | } | |
1e295370 | 170 | EXPORT_SYMBOL(xfrm_parse_spi); |
1da177e4 | 171 | |
b3284df1 FW |
172 | static int xfrm4_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb) |
173 | { | |
174 | struct iphdr *iph; | |
175 | int optlen = 0; | |
176 | int err = -EINVAL; | |
177 | ||
178 | if (unlikely(XFRM_MODE_SKB_CB(skb)->protocol == IPPROTO_BEETPH)) { | |
179 | struct ip_beet_phdr *ph; | |
180 | int phlen; | |
181 | ||
182 | if (!pskb_may_pull(skb, sizeof(*ph))) | |
183 | goto out; | |
184 | ||
185 | ph = (struct ip_beet_phdr *)skb->data; | |
186 | ||
187 | phlen = sizeof(*ph) + ph->padlen; | |
188 | optlen = ph->hdrlen * 8 + (IPV4_BEET_PHMAXLEN - phlen); | |
189 | if (optlen < 0 || optlen & 3 || optlen > 250) | |
190 | goto out; | |
191 | ||
192 | XFRM_MODE_SKB_CB(skb)->protocol = ph->nexthdr; | |
193 | ||
194 | if (!pskb_may_pull(skb, phlen)) | |
195 | goto out; | |
196 | __skb_pull(skb, phlen); | |
197 | } | |
198 | ||
199 | skb_push(skb, sizeof(*iph)); | |
200 | skb_reset_network_header(skb); | |
201 | skb_mac_header_rebuild(skb); | |
202 | ||
203 | xfrm4_beet_make_header(skb); | |
204 | ||
205 | iph = ip_hdr(skb); | |
206 | ||
207 | iph->ihl += optlen / 4; | |
208 | iph->tot_len = htons(skb->len); | |
209 | iph->daddr = x->sel.daddr.a4; | |
210 | iph->saddr = x->sel.saddr.a4; | |
211 | iph->check = 0; | |
212 | iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); | |
213 | err = 0; | |
214 | out: | |
215 | return err; | |
216 | } | |
217 | ||
218 | static void ipip_ecn_decapsulate(struct sk_buff *skb) | |
219 | { | |
220 | struct iphdr *inner_iph = ipip_hdr(skb); | |
221 | ||
222 | if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos)) | |
223 | IP_ECN_set_ce(inner_iph); | |
224 | } | |
225 | ||
226 | static int xfrm4_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb) | |
227 | { | |
228 | int err = -EINVAL; | |
229 | ||
230 | if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPIP) | |
231 | goto out; | |
232 | ||
233 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
234 | goto out; | |
235 | ||
236 | err = skb_unclone(skb, GFP_ATOMIC); | |
237 | if (err) | |
238 | goto out; | |
239 | ||
240 | if (x->props.flags & XFRM_STATE_DECAP_DSCP) | |
241 | ipv4_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipip_hdr(skb)); | |
242 | if (!(x->props.flags & XFRM_STATE_NOECN)) | |
243 | ipip_ecn_decapsulate(skb); | |
244 | ||
245 | skb_reset_network_header(skb); | |
246 | skb_mac_header_rebuild(skb); | |
247 | if (skb->mac_len) | |
248 | eth_hdr(skb)->h_proto = skb->protocol; | |
249 | ||
250 | err = 0; | |
251 | ||
252 | out: | |
253 | return err; | |
254 | } | |
255 | ||
256 | static void ipip6_ecn_decapsulate(struct sk_buff *skb) | |
257 | { | |
258 | struct ipv6hdr *inner_iph = ipipv6_hdr(skb); | |
259 | ||
260 | if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos)) | |
261 | IP6_ECN_set_ce(skb, inner_iph); | |
262 | } | |
263 | ||
264 | static int xfrm6_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb) | |
265 | { | |
266 | int err = -EINVAL; | |
267 | ||
268 | if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPV6) | |
269 | goto out; | |
270 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
271 | goto out; | |
272 | ||
273 | err = skb_unclone(skb, GFP_ATOMIC); | |
274 | if (err) | |
275 | goto out; | |
276 | ||
277 | if (x->props.flags & XFRM_STATE_DECAP_DSCP) | |
278 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6_hdr(skb)), | |
279 | ipipv6_hdr(skb)); | |
280 | if (!(x->props.flags & XFRM_STATE_NOECN)) | |
281 | ipip6_ecn_decapsulate(skb); | |
282 | ||
283 | skb_reset_network_header(skb); | |
284 | skb_mac_header_rebuild(skb); | |
285 | if (skb->mac_len) | |
286 | eth_hdr(skb)->h_proto = skb->protocol; | |
287 | ||
288 | err = 0; | |
289 | ||
290 | out: | |
291 | return err; | |
292 | } | |
293 | ||
294 | static int xfrm6_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb) | |
295 | { | |
296 | struct ipv6hdr *ip6h; | |
297 | int size = sizeof(struct ipv6hdr); | |
298 | int err; | |
299 | ||
300 | err = skb_cow_head(skb, size + skb->mac_len); | |
301 | if (err) | |
302 | goto out; | |
303 | ||
304 | __skb_push(skb, size); | |
305 | skb_reset_network_header(skb); | |
306 | skb_mac_header_rebuild(skb); | |
307 | ||
308 | xfrm6_beet_make_header(skb); | |
309 | ||
310 | ip6h = ipv6_hdr(skb); | |
311 | ip6h->payload_len = htons(skb->len - size); | |
312 | ip6h->daddr = x->sel.daddr.in6; | |
313 | ip6h->saddr = x->sel.saddr.in6; | |
314 | err = 0; | |
315 | out: | |
316 | return err; | |
317 | } | |
318 | ||
319 | /* Remove encapsulation header. | |
320 | * | |
321 | * The IP header will be moved over the top of the encapsulation | |
322 | * header. | |
323 | * | |
324 | * On entry, the transport header shall point to where the IP header | |
325 | * should be and the network header shall be set to where the IP | |
326 | * header currently is. skb->data shall point to the start of the | |
327 | * payload. | |
328 | */ | |
329 | static int | |
330 | xfrm_inner_mode_encap_remove(struct xfrm_state *x, | |
331 | const struct xfrm_mode *inner_mode, | |
332 | struct sk_buff *skb) | |
333 | { | |
334 | switch (inner_mode->encap) { | |
335 | case XFRM_MODE_BEET: | |
336 | if (inner_mode->family == AF_INET) | |
337 | return xfrm4_remove_beet_encap(x, skb); | |
338 | if (inner_mode->family == AF_INET6) | |
339 | return xfrm6_remove_beet_encap(x, skb); | |
340 | break; | |
341 | case XFRM_MODE_TUNNEL: | |
342 | if (inner_mode->family == AF_INET) | |
343 | return xfrm4_remove_tunnel_encap(x, skb); | |
344 | if (inner_mode->family == AF_INET6) | |
345 | return xfrm6_remove_tunnel_encap(x, skb); | |
346 | break; | |
347 | } | |
348 | ||
349 | WARN_ON_ONCE(1); | |
350 | return -EOPNOTSUPP; | |
351 | } | |
352 | ||
c2d305e5 | 353 | static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb) |
227620e2 | 354 | { |
c9500d7b | 355 | const struct xfrm_mode *inner_mode = &x->inner_mode; |
227620e2 | 356 | |
a269fbfc FW |
357 | switch (x->outer_mode.family) { |
358 | case AF_INET: | |
359 | xfrm4_extract_header(skb); | |
360 | break; | |
361 | case AF_INET6: | |
362 | xfrm6_extract_header(skb); | |
363 | break; | |
364 | default: | |
365 | WARN_ON_ONCE(1); | |
366 | return -EAFNOSUPPORT; | |
367 | } | |
227620e2 | 368 | |
df9dcb45 KM |
369 | if (x->sel.family == AF_UNSPEC) { |
370 | inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); | |
4c203b04 | 371 | if (!inner_mode) |
df9dcb45 KM |
372 | return -EAFNOSUPPORT; |
373 | } | |
374 | ||
4c203b04 FW |
375 | switch (inner_mode->family) { |
376 | case AF_INET: | |
377 | skb->protocol = htons(ETH_P_IP); | |
378 | break; | |
379 | case AF_INET6: | |
380 | skb->protocol = htons(ETH_P_IPV6); | |
1be451d9 | 381 | break; |
4c203b04 FW |
382 | default: |
383 | WARN_ON_ONCE(1); | |
384 | break; | |
733a5fac FW |
385 | } |
386 | ||
b3284df1 | 387 | return xfrm_inner_mode_encap_remove(x, inner_mode, skb); |
227620e2 | 388 | } |
c2d305e5 FW |
389 | |
390 | /* Remove encapsulation header. | |
391 | * | |
392 | * The IP header will be moved over the top of the encapsulation header. | |
393 | * | |
394 | * On entry, skb_transport_header() shall point to where the IP header | |
395 | * should be and skb_network_header() shall be set to where the IP header | |
396 | * currently is. skb->data shall point to the start of the payload. | |
397 | */ | |
398 | static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb) | |
399 | { | |
c2d305e5 FW |
400 | int ihl = skb->data - skb_transport_header(skb); |
401 | ||
402 | if (skb->transport_header != skb->network_header) { | |
403 | memmove(skb_transport_header(skb), | |
404 | skb_network_header(skb), ihl); | |
405 | skb->network_header = skb->transport_header; | |
406 | } | |
407 | ip_hdr(skb)->tot_len = htons(skb->len + ihl); | |
408 | skb_reset_transport_header(skb); | |
409 | return 0; | |
c2d305e5 FW |
410 | } |
411 | ||
412 | static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb) | |
413 | { | |
4c145dce | 414 | #if IS_ENABLED(CONFIG_IPV6) |
c2d305e5 FW |
415 | int ihl = skb->data - skb_transport_header(skb); |
416 | ||
417 | if (skb->transport_header != skb->network_header) { | |
418 | memmove(skb_transport_header(skb), | |
419 | skb_network_header(skb), ihl); | |
420 | skb->network_header = skb->transport_header; | |
421 | } | |
422 | ipv6_hdr(skb)->payload_len = htons(skb->len + ihl - | |
423 | sizeof(struct ipv6hdr)); | |
424 | skb_reset_transport_header(skb); | |
425 | return 0; | |
426 | #else | |
4c145dce FW |
427 | WARN_ON_ONCE(1); |
428 | return -EAFNOSUPPORT; | |
c2d305e5 FW |
429 | #endif |
430 | } | |
431 | ||
432 | static int xfrm_inner_mode_input(struct xfrm_state *x, | |
433 | const struct xfrm_mode *inner_mode, | |
434 | struct sk_buff *skb) | |
435 | { | |
436 | switch (inner_mode->encap) { | |
437 | case XFRM_MODE_BEET: | |
438 | case XFRM_MODE_TUNNEL: | |
439 | return xfrm_prepare_input(x, skb); | |
440 | case XFRM_MODE_TRANSPORT: | |
441 | if (inner_mode->family == AF_INET) | |
442 | return xfrm4_transport_input(x, skb); | |
443 | if (inner_mode->family == AF_INET6) | |
444 | return xfrm6_transport_input(x, skb); | |
445 | break; | |
446 | case XFRM_MODE_ROUTEOPTIMIZATION: | |
447 | WARN_ON_ONCE(1); | |
448 | break; | |
449 | default: | |
450 | WARN_ON_ONCE(1); | |
451 | break; | |
452 | } | |
453 | ||
454 | return -EOPNOTSUPP; | |
455 | } | |
227620e2 | 456 | |
716062fd HX |
457 | int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) |
458 | { | |
733a5fac | 459 | const struct xfrm_state_afinfo *afinfo; |
bd235e3c | 460 | struct net *net = dev_net(skb->dev); |
4c145dce | 461 | const struct xfrm_mode *inner_mode; |
716062fd HX |
462 | int err; |
463 | __be32 seq; | |
2cd08467 | 464 | __be32 seq_hi; |
3328715e | 465 | struct xfrm_state *x = NULL; |
1bf06cd2 | 466 | xfrm_address_t *daddr; |
049f8e2e | 467 | u32 mark = skb->mark; |
4ce3dbe3 | 468 | unsigned int family = AF_UNSPEC; |
716062fd | 469 | int decaps = 0; |
1bf06cd2 | 470 | int async = 0; |
7785bba2 | 471 | bool xfrm_gro = false; |
d77e38e6 SK |
472 | bool crypto_done = false; |
473 | struct xfrm_offload *xo = xfrm_offload(skb); | |
0ca64da1 | 474 | struct sec_path *sp; |
1bf06cd2 | 475 | |
1bf06cd2 | 476 | if (encap_type < 0) { |
00501121 | 477 | x = xfrm_input_state(skb); |
4ce3dbe3 AH |
478 | |
479 | if (unlikely(x->km.state != XFRM_STATE_VALID)) { | |
480 | if (x->km.state == XFRM_STATE_ACQ) | |
481 | XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR); | |
482 | else | |
483 | XFRM_INC_STATS(net, | |
484 | LINUX_MIB_XFRMINSTATEINVALID); | |
4944a4b1 XX |
485 | |
486 | if (encap_type == -1) | |
487 | dev_put(skb->dev); | |
4ce3dbe3 AH |
488 | goto drop; |
489 | } | |
490 | ||
c9500d7b | 491 | family = x->outer_mode.family; |
7785bba2 SK |
492 | |
493 | /* An encap_type of -1 indicates async resumption. */ | |
494 | if (encap_type == -1) { | |
495 | async = 1; | |
496 | seq = XFRM_SKB_CB(skb)->seq.input.low; | |
497 | goto resume; | |
498 | } | |
bcd1f8a4 | 499 | |
7785bba2 SK |
500 | /* encap_type < -1 indicates a GRO call. */ |
501 | encap_type = 0; | |
502 | seq = XFRM_SPI_SKB_CB(skb)->seq; | |
716062fd | 503 | |
bcd1f8a4 SK |
504 | if (xo && (xo->flags & CRYPTO_DONE)) { |
505 | crypto_done = true; | |
bcd1f8a4 SK |
506 | family = XFRM_SPI_SKB_CB(skb)->family; |
507 | ||
508 | if (!(xo->status & CRYPTO_SUCCESS)) { | |
509 | if (xo->status & | |
510 | (CRYPTO_TRANSPORT_AH_AUTH_FAILED | | |
511 | CRYPTO_TRANSPORT_ESP_AUTH_FAILED | | |
512 | CRYPTO_TUNNEL_AH_AUTH_FAILED | | |
513 | CRYPTO_TUNNEL_ESP_AUTH_FAILED)) { | |
514 | ||
515 | xfrm_audit_state_icvfail(x, skb, | |
516 | x->type->proto); | |
517 | x->stats.integrity_failed++; | |
518 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); | |
519 | goto drop; | |
520 | } | |
521 | ||
47ebcc0b YK |
522 | if (xo->status & CRYPTO_INVALID_PROTOCOL) { |
523 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); | |
524 | goto drop; | |
525 | } | |
526 | ||
bcd1f8a4 | 527 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
d77e38e6 SK |
528 | goto drop; |
529 | } | |
530 | ||
bcd1f8a4 SK |
531 | if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) { |
532 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); | |
533 | goto drop; | |
534 | } | |
d77e38e6 SK |
535 | } |
536 | ||
7785bba2 | 537 | goto lock; |
1bf06cd2 | 538 | } |
716062fd | 539 | |
3328715e SK |
540 | family = XFRM_SPI_SKB_CB(skb)->family; |
541 | ||
049f8e2e | 542 | /* if tunnel is present override skb->mark value with tunnel i_key */ |
1625f452 AK |
543 | switch (family) { |
544 | case AF_INET: | |
545 | if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) | |
049f8e2e | 546 | mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key); |
1625f452 AK |
547 | break; |
548 | case AF_INET6: | |
549 | if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) | |
049f8e2e | 550 | mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key); |
1625f452 | 551 | break; |
049f8e2e AD |
552 | } |
553 | ||
0ca64da1 FW |
554 | sp = secpath_set(skb); |
555 | if (!sp) { | |
b0fcee82 SK |
556 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); |
557 | goto drop; | |
b2aa5e9d HX |
558 | } |
559 | ||
716062fd | 560 | seq = 0; |
0aa64774 | 561 | if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) { |
f203b76d | 562 | secpath_reset(skb); |
59c9940e | 563 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
716062fd | 564 | goto drop; |
0aa64774 | 565 | } |
716062fd | 566 | |
cb79a180 FW |
567 | daddr = (xfrm_address_t *)(skb_network_header(skb) + |
568 | XFRM_SPI_SKB_CB(skb)->daddroff); | |
716062fd | 569 | do { |
2294be0f FW |
570 | sp = skb_sec_path(skb); |
571 | ||
572 | if (sp->len == XFRM_MAX_DEPTH) { | |
f203b76d | 573 | secpath_reset(skb); |
59c9940e | 574 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
716062fd | 575 | goto drop; |
0aa64774 | 576 | } |
716062fd | 577 | |
049f8e2e | 578 | x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family); |
0aa64774 | 579 | if (x == NULL) { |
f203b76d | 580 | secpath_reset(skb); |
59c9940e | 581 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES); |
afeb14b4 | 582 | xfrm_audit_state_notfound(skb, family, spi, seq); |
716062fd | 583 | goto drop; |
0aa64774 | 584 | } |
716062fd | 585 | |
9b42c1f1 SK |
586 | skb->mark = xfrm_smark_get(skb->mark, x); |
587 | ||
2294be0f | 588 | sp->xvec[sp->len++] = x; |
b2aa5e9d | 589 | |
0152eee6 SK |
590 | skb_dst_force(skb); |
591 | if (!skb_dst(skb)) { | |
592 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); | |
593 | goto drop; | |
594 | } | |
595 | ||
7785bba2 | 596 | lock: |
716062fd | 597 | spin_lock(&x->lock); |
4c4d41f2 | 598 | |
0aa64774 | 599 | if (unlikely(x->km.state != XFRM_STATE_VALID)) { |
dc0565ce LR |
600 | if (x->km.state == XFRM_STATE_ACQ) |
601 | XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR); | |
602 | else | |
603 | XFRM_INC_STATS(net, | |
604 | LINUX_MIB_XFRMINSTATEINVALID); | |
716062fd | 605 | goto drop_unlock; |
0aa64774 | 606 | } |
716062fd | 607 | |
3de77cf2 DM |
608 | if ((x->encap ? x->encap->encap_type : 0) != encap_type) { |
609 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); | |
610 | goto drop_unlock; | |
611 | } | |
612 | ||
36ae0148 | 613 | if (x->repl->check(x, skb, seq)) { |
59c9940e | 614 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); |
716062fd | 615 | goto drop_unlock; |
0aa64774 | 616 | } |
716062fd | 617 | |
0aa64774 | 618 | if (xfrm_state_check_expire(x)) { |
59c9940e | 619 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED); |
716062fd | 620 | goto drop_unlock; |
0aa64774 | 621 | } |
716062fd | 622 | |
0ebea8ef HX |
623 | spin_unlock(&x->lock); |
624 | ||
68c11e98 AD |
625 | if (xfrm_tunnel_check(skb, x, family)) { |
626 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); | |
627 | goto drop; | |
628 | } | |
629 | ||
2cd08467 SK |
630 | seq_hi = htonl(xfrm_replay_seqhi(x, seq)); |
631 | ||
1ce3644a | 632 | XFRM_SKB_CB(skb)->seq.input.low = seq; |
2cd08467 | 633 | XFRM_SKB_CB(skb)->seq.input.hi = seq_hi; |
1bf06cd2 | 634 | |
071d36bf | 635 | dev_hold(skb->dev); |
3bc07321 | 636 | |
d77e38e6 SK |
637 | if (crypto_done) |
638 | nexthdr = x->type_offload->input_tail(x, skb); | |
639 | else | |
640 | nexthdr = x->type->input(x, skb); | |
0ebea8ef | 641 | |
1bf06cd2 HX |
642 | if (nexthdr == -EINPROGRESS) |
643 | return 0; | |
1bf06cd2 | 644 | resume: |
071d36bf | 645 | dev_put(skb->dev); |
646 | ||
0ebea8ef | 647 | spin_lock(&x->lock); |
668dc8af | 648 | if (nexthdr <= 0) { |
9dd3245a HX |
649 | if (nexthdr == -EBADMSG) { |
650 | xfrm_audit_state_icvfail(x, skb, | |
651 | x->type->proto); | |
668dc8af | 652 | x->stats.integrity_failed++; |
9dd3245a | 653 | } |
59c9940e | 654 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); |
716062fd | 655 | goto drop_unlock; |
668dc8af | 656 | } |
716062fd | 657 | |
716062fd HX |
658 | /* only the first xfrm gets the encap type */ |
659 | encap_type = 0; | |
660 | ||
3b59df46 | 661 | if (async && x->repl->recheck(x, skb, seq)) { |
bcf66bf5 SK |
662 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); |
663 | goto drop_unlock; | |
664 | } | |
665 | ||
9fdc4883 | 666 | x->repl->advance(x, seq); |
716062fd HX |
667 | |
668 | x->curlft.bytes += skb->len; | |
669 | x->curlft.packets++; | |
670 | ||
671 | spin_unlock(&x->lock); | |
672 | ||
60d5fcfb HX |
673 | XFRM_MODE_SKB_CB(skb)->protocol = nexthdr; |
674 | ||
c9500d7b | 675 | inner_mode = &x->inner_mode; |
df9dcb45 KM |
676 | |
677 | if (x->sel.family == AF_UNSPEC) { | |
678 | inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); | |
cb866e32 SK |
679 | if (inner_mode == NULL) { |
680 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); | |
df9dcb45 | 681 | goto drop; |
cb866e32 | 682 | } |
df9dcb45 KM |
683 | } |
684 | ||
c2d305e5 | 685 | if (xfrm_inner_mode_input(x, inner_mode, skb)) { |
59c9940e | 686 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); |
716062fd | 687 | goto drop; |
0aa64774 | 688 | } |
716062fd | 689 | |
c9500d7b | 690 | if (x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL) { |
716062fd HX |
691 | decaps = 1; |
692 | break; | |
693 | } | |
694 | ||
1bf06cd2 HX |
695 | /* |
696 | * We need the inner address. However, we only get here for | |
697 | * transport mode so the outer address is identical. | |
698 | */ | |
699 | daddr = &x->id.daddr; | |
c9500d7b | 700 | family = x->outer_mode.family; |
1bf06cd2 | 701 | |
716062fd | 702 | err = xfrm_parse_spi(skb, nexthdr, &spi, &seq); |
0aa64774 | 703 | if (err < 0) { |
59c9940e | 704 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
716062fd | 705 | goto drop; |
0aa64774 | 706 | } |
782710e3 | 707 | crypto_done = false; |
716062fd HX |
708 | } while (!err); |
709 | ||
3328715e SK |
710 | err = xfrm_rcv_cb(skb, family, x->type->proto, 0); |
711 | if (err) | |
712 | goto drop; | |
713 | ||
895b5c9f | 714 | nf_reset_ct(skb); |
716062fd HX |
715 | |
716 | if (decaps) { | |
2294be0f FW |
717 | sp = skb_sec_path(skb); |
718 | if (sp) | |
719 | sp->olen = 0; | |
adf30907 | 720 | skb_dst_drop(skb); |
1995876a | 721 | gro_cells_receive(&gro_cells, skb); |
716062fd HX |
722 | return 0; |
723 | } else { | |
7785bba2 SK |
724 | xo = xfrm_offload(skb); |
725 | if (xo) | |
726 | xfrm_gro = xo->flags & XFRM_GRO; | |
727 | ||
733a5fac FW |
728 | err = -EAFNOSUPPORT; |
729 | rcu_read_lock(); | |
c9500d7b | 730 | afinfo = xfrm_state_afinfo_get_rcu(x->inner_mode.family); |
733a5fac FW |
731 | if (likely(afinfo)) |
732 | err = afinfo->transport_finish(skb, xfrm_gro || async); | |
733 | rcu_read_unlock(); | |
7785bba2 | 734 | if (xfrm_gro) { |
2294be0f FW |
735 | sp = skb_sec_path(skb); |
736 | if (sp) | |
737 | sp->olen = 0; | |
7785bba2 SK |
738 | skb_dst_drop(skb); |
739 | gro_cells_receive(&gro_cells, skb); | |
740 | return err; | |
741 | } | |
742 | ||
743 | return err; | |
716062fd HX |
744 | } |
745 | ||
746 | drop_unlock: | |
747 | spin_unlock(&x->lock); | |
716062fd | 748 | drop: |
3328715e | 749 | xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1); |
716062fd HX |
750 | kfree_skb(skb); |
751 | return 0; | |
752 | } | |
753 | EXPORT_SYMBOL(xfrm_input); | |
754 | ||
1bf06cd2 HX |
755 | int xfrm_input_resume(struct sk_buff *skb, int nexthdr) |
756 | { | |
757 | return xfrm_input(skb, nexthdr, 0, -1); | |
758 | } | |
759 | EXPORT_SYMBOL(xfrm_input_resume); | |
760 | ||
acf568ee HX |
761 | static void xfrm_trans_reinject(unsigned long data) |
762 | { | |
763 | struct xfrm_trans_tasklet *trans = (void *)data; | |
764 | struct sk_buff_head queue; | |
765 | struct sk_buff *skb; | |
766 | ||
767 | __skb_queue_head_init(&queue); | |
768 | skb_queue_splice_init(&trans->queue, &queue); | |
769 | ||
770 | while ((skb = __skb_dequeue(&queue))) | |
7b380192 SD |
771 | XFRM_TRANS_SKB_CB(skb)->finish(XFRM_TRANS_SKB_CB(skb)->net, |
772 | NULL, skb); | |
acf568ee HX |
773 | } |
774 | ||
7b380192 SD |
775 | int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, |
776 | int (*finish)(struct net *, struct sock *, | |
777 | struct sk_buff *)) | |
acf568ee HX |
778 | { |
779 | struct xfrm_trans_tasklet *trans; | |
780 | ||
781 | trans = this_cpu_ptr(&xfrm_trans_tasklet); | |
782 | ||
783 | if (skb_queue_len(&trans->queue) >= netdev_max_backlog) | |
784 | return -ENOBUFS; | |
785 | ||
7b380192 SD |
786 | BUILD_BUG_ON(sizeof(struct xfrm_trans_cb) > sizeof(skb->cb)); |
787 | ||
acf568ee | 788 | XFRM_TRANS_SKB_CB(skb)->finish = finish; |
7b380192 | 789 | XFRM_TRANS_SKB_CB(skb)->net = net; |
d16b46e4 | 790 | __skb_queue_tail(&trans->queue, skb); |
acf568ee HX |
791 | tasklet_schedule(&trans->tasklet); |
792 | return 0; | |
793 | } | |
7b380192 SD |
794 | EXPORT_SYMBOL(xfrm_trans_queue_net); |
795 | ||
796 | int xfrm_trans_queue(struct sk_buff *skb, | |
797 | int (*finish)(struct net *, struct sock *, | |
798 | struct sk_buff *)) | |
799 | { | |
800 | return xfrm_trans_queue_net(dev_net(skb->dev), skb, finish); | |
801 | } | |
acf568ee HX |
802 | EXPORT_SYMBOL(xfrm_trans_queue); |
803 | ||
1da177e4 LT |
804 | void __init xfrm_input_init(void) |
805 | { | |
1995876a | 806 | int err; |
acf568ee | 807 | int i; |
1995876a SK |
808 | |
809 | init_dummy_netdev(&xfrm_napi_dev); | |
810 | err = gro_cells_init(&gro_cells, &xfrm_napi_dev); | |
811 | if (err) | |
812 | gro_cells.cells = NULL; | |
813 | ||
acf568ee HX |
814 | for_each_possible_cpu(i) { |
815 | struct xfrm_trans_tasklet *trans; | |
816 | ||
817 | trans = &per_cpu(xfrm_trans_tasklet, i); | |
818 | __skb_queue_head_init(&trans->queue); | |
819 | tasklet_init(&trans->tasklet, xfrm_trans_reinject, | |
820 | (unsigned long)trans); | |
821 | } | |
1da177e4 | 822 | } |