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Commit | Line | Data |
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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); |
1475ee0a | 45 | static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[2][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 | ||
1475ee0a | 56 | if (WARN_ON(afinfo->family > AF_INET6)) |
2f32b51b | 57 | return -EAFNOSUPPORT; |
960fdfde | 58 | |
2f32b51b | 59 | spin_lock_bh(&xfrm_input_afinfo_lock); |
1475ee0a | 60 | if (unlikely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family])) |
f31e8d4f | 61 | err = -EEXIST; |
2f32b51b | 62 | else |
1475ee0a | 63 | rcu_assign_pointer(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family], afinfo); |
2f32b51b SK |
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 | 73 | spin_lock_bh(&xfrm_input_afinfo_lock); |
1475ee0a XL |
74 | if (likely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family])) { |
75 | if (unlikely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family] != afinfo)) | |
2f32b51b SK |
76 | err = -EINVAL; |
77 | else | |
1475ee0a | 78 | RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family], NULL); |
2f32b51b SK |
79 | } |
80 | spin_unlock_bh(&xfrm_input_afinfo_lock); | |
81 | synchronize_rcu(); | |
82 | return err; | |
83 | } | |
84 | EXPORT_SYMBOL(xfrm_input_unregister_afinfo); | |
85 | ||
1475ee0a | 86 | static const struct xfrm_input_afinfo *xfrm_input_get_afinfo(u8 family, bool is_ipip) |
2f32b51b | 87 | { |
960fdfde | 88 | const struct xfrm_input_afinfo *afinfo; |
2f32b51b | 89 | |
1475ee0a | 90 | if (WARN_ON_ONCE(family > AF_INET6)) |
2f32b51b | 91 | return NULL; |
960fdfde | 92 | |
2f32b51b | 93 | rcu_read_lock(); |
1475ee0a | 94 | afinfo = rcu_dereference(xfrm_input_afinfo[is_ipip][family]); |
2f32b51b SK |
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 | { | |
1475ee0a XL |
103 | bool is_ipip = (protocol == IPPROTO_IPIP || protocol == IPPROTO_IPV6); |
104 | const struct xfrm_input_afinfo *afinfo; | |
2f32b51b | 105 | int ret; |
2f32b51b | 106 | |
1475ee0a | 107 | afinfo = xfrm_input_get_afinfo(family, is_ipip); |
2f32b51b SK |
108 | if (!afinfo) |
109 | return -EAFNOSUPPORT; | |
110 | ||
111 | ret = afinfo->callback(skb, protocol, err); | |
960fdfde | 112 | rcu_read_unlock(); |
2f32b51b SK |
113 | |
114 | return ret; | |
115 | } | |
116 | ||
4165079b | 117 | struct sec_path *secpath_set(struct sk_buff *skb) |
1da177e4 | 118 | { |
4165079b | 119 | struct sec_path *sp, *tmp = skb_ext_find(skb, SKB_EXT_SEC_PATH); |
1da177e4 | 120 | |
4165079b | 121 | sp = skb_ext_add(skb, SKB_EXT_SEC_PATH); |
1da177e4 LT |
122 | if (!sp) |
123 | return NULL; | |
124 | ||
4165079b FW |
125 | if (tmp) /* reused existing one (was COW'd if needed) */ |
126 | return sp; | |
54ef207a | 127 | |
4165079b | 128 | /* allocated new secpath */ |
f1193e91 | 129 | memset(sp->ovec, 0, sizeof(sp->ovec)); |
4165079b FW |
130 | sp->olen = 0; |
131 | sp->len = 0; | |
0ca64da1 FW |
132 | |
133 | return sp; | |
b0fcee82 SK |
134 | } |
135 | EXPORT_SYMBOL(secpath_set); | |
136 | ||
1da177e4 LT |
137 | /* Fetch spi and seq from ipsec header */ |
138 | ||
6067b2ba | 139 | int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq) |
1da177e4 LT |
140 | { |
141 | int offset, offset_seq; | |
44072500 | 142 | int hlen; |
1da177e4 LT |
143 | |
144 | switch (nexthdr) { | |
145 | case IPPROTO_AH: | |
44072500 | 146 | hlen = sizeof(struct ip_auth_hdr); |
1da177e4 LT |
147 | offset = offsetof(struct ip_auth_hdr, spi); |
148 | offset_seq = offsetof(struct ip_auth_hdr, seq_no); | |
149 | break; | |
150 | case IPPROTO_ESP: | |
44072500 | 151 | hlen = sizeof(struct ip_esp_hdr); |
1da177e4 LT |
152 | offset = offsetof(struct ip_esp_hdr, spi); |
153 | offset_seq = offsetof(struct ip_esp_hdr, seq_no); | |
154 | break; | |
155 | case IPPROTO_COMP: | |
156 | if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr))) | |
157 | return -EINVAL; | |
3e94c2dc | 158 | *spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2))); |
1da177e4 LT |
159 | *seq = 0; |
160 | return 0; | |
161 | default: | |
162 | return 1; | |
163 | } | |
164 | ||
44072500 | 165 | if (!pskb_may_pull(skb, hlen)) |
1da177e4 LT |
166 | return -EINVAL; |
167 | ||
3e94c2dc WC |
168 | *spi = *(__be32 *)(skb_transport_header(skb) + offset); |
169 | *seq = *(__be32 *)(skb_transport_header(skb) + offset_seq); | |
1da177e4 LT |
170 | return 0; |
171 | } | |
1e295370 | 172 | EXPORT_SYMBOL(xfrm_parse_spi); |
1da177e4 | 173 | |
b3284df1 FW |
174 | static int xfrm4_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb) |
175 | { | |
176 | struct iphdr *iph; | |
177 | int optlen = 0; | |
178 | int err = -EINVAL; | |
179 | ||
180 | if (unlikely(XFRM_MODE_SKB_CB(skb)->protocol == IPPROTO_BEETPH)) { | |
181 | struct ip_beet_phdr *ph; | |
182 | int phlen; | |
183 | ||
184 | if (!pskb_may_pull(skb, sizeof(*ph))) | |
185 | goto out; | |
186 | ||
187 | ph = (struct ip_beet_phdr *)skb->data; | |
188 | ||
189 | phlen = sizeof(*ph) + ph->padlen; | |
190 | optlen = ph->hdrlen * 8 + (IPV4_BEET_PHMAXLEN - phlen); | |
191 | if (optlen < 0 || optlen & 3 || optlen > 250) | |
192 | goto out; | |
193 | ||
194 | XFRM_MODE_SKB_CB(skb)->protocol = ph->nexthdr; | |
195 | ||
196 | if (!pskb_may_pull(skb, phlen)) | |
197 | goto out; | |
198 | __skb_pull(skb, phlen); | |
199 | } | |
200 | ||
201 | skb_push(skb, sizeof(*iph)); | |
202 | skb_reset_network_header(skb); | |
203 | skb_mac_header_rebuild(skb); | |
204 | ||
205 | xfrm4_beet_make_header(skb); | |
206 | ||
207 | iph = ip_hdr(skb); | |
208 | ||
209 | iph->ihl += optlen / 4; | |
210 | iph->tot_len = htons(skb->len); | |
211 | iph->daddr = x->sel.daddr.a4; | |
212 | iph->saddr = x->sel.saddr.a4; | |
213 | iph->check = 0; | |
214 | iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); | |
215 | err = 0; | |
216 | out: | |
217 | return err; | |
218 | } | |
219 | ||
220 | static void ipip_ecn_decapsulate(struct sk_buff *skb) | |
221 | { | |
222 | struct iphdr *inner_iph = ipip_hdr(skb); | |
223 | ||
224 | if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos)) | |
225 | IP_ECN_set_ce(inner_iph); | |
226 | } | |
227 | ||
228 | static int xfrm4_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb) | |
229 | { | |
230 | int err = -EINVAL; | |
231 | ||
232 | if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPIP) | |
233 | goto out; | |
234 | ||
235 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
236 | goto out; | |
237 | ||
238 | err = skb_unclone(skb, GFP_ATOMIC); | |
239 | if (err) | |
240 | goto out; | |
241 | ||
242 | if (x->props.flags & XFRM_STATE_DECAP_DSCP) | |
243 | ipv4_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipip_hdr(skb)); | |
244 | if (!(x->props.flags & XFRM_STATE_NOECN)) | |
245 | ipip_ecn_decapsulate(skb); | |
246 | ||
247 | skb_reset_network_header(skb); | |
248 | skb_mac_header_rebuild(skb); | |
249 | if (skb->mac_len) | |
250 | eth_hdr(skb)->h_proto = skb->protocol; | |
251 | ||
252 | err = 0; | |
253 | ||
254 | out: | |
255 | return err; | |
256 | } | |
257 | ||
258 | static void ipip6_ecn_decapsulate(struct sk_buff *skb) | |
259 | { | |
260 | struct ipv6hdr *inner_iph = ipipv6_hdr(skb); | |
261 | ||
262 | if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos)) | |
263 | IP6_ECN_set_ce(skb, inner_iph); | |
264 | } | |
265 | ||
266 | static int xfrm6_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb) | |
267 | { | |
268 | int err = -EINVAL; | |
269 | ||
270 | if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPV6) | |
271 | goto out; | |
272 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
273 | goto out; | |
274 | ||
275 | err = skb_unclone(skb, GFP_ATOMIC); | |
276 | if (err) | |
277 | goto out; | |
278 | ||
279 | if (x->props.flags & XFRM_STATE_DECAP_DSCP) | |
280 | ipv6_copy_dscp(ipv6_get_dsfield(ipv6_hdr(skb)), | |
281 | ipipv6_hdr(skb)); | |
282 | if (!(x->props.flags & XFRM_STATE_NOECN)) | |
283 | ipip6_ecn_decapsulate(skb); | |
284 | ||
285 | skb_reset_network_header(skb); | |
286 | skb_mac_header_rebuild(skb); | |
287 | if (skb->mac_len) | |
288 | eth_hdr(skb)->h_proto = skb->protocol; | |
289 | ||
290 | err = 0; | |
291 | ||
292 | out: | |
293 | return err; | |
294 | } | |
295 | ||
296 | static int xfrm6_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb) | |
297 | { | |
298 | struct ipv6hdr *ip6h; | |
299 | int size = sizeof(struct ipv6hdr); | |
300 | int err; | |
301 | ||
302 | err = skb_cow_head(skb, size + skb->mac_len); | |
303 | if (err) | |
304 | goto out; | |
305 | ||
306 | __skb_push(skb, size); | |
307 | skb_reset_network_header(skb); | |
308 | skb_mac_header_rebuild(skb); | |
309 | ||
310 | xfrm6_beet_make_header(skb); | |
311 | ||
312 | ip6h = ipv6_hdr(skb); | |
313 | ip6h->payload_len = htons(skb->len - size); | |
314 | ip6h->daddr = x->sel.daddr.in6; | |
315 | ip6h->saddr = x->sel.saddr.in6; | |
316 | err = 0; | |
317 | out: | |
318 | return err; | |
319 | } | |
320 | ||
321 | /* Remove encapsulation header. | |
322 | * | |
323 | * The IP header will be moved over the top of the encapsulation | |
324 | * header. | |
325 | * | |
326 | * On entry, the transport header shall point to where the IP header | |
327 | * should be and the network header shall be set to where the IP | |
328 | * header currently is. skb->data shall point to the start of the | |
329 | * payload. | |
330 | */ | |
331 | static int | |
332 | xfrm_inner_mode_encap_remove(struct xfrm_state *x, | |
333 | const struct xfrm_mode *inner_mode, | |
334 | struct sk_buff *skb) | |
335 | { | |
336 | switch (inner_mode->encap) { | |
337 | case XFRM_MODE_BEET: | |
338 | if (inner_mode->family == AF_INET) | |
339 | return xfrm4_remove_beet_encap(x, skb); | |
340 | if (inner_mode->family == AF_INET6) | |
341 | return xfrm6_remove_beet_encap(x, skb); | |
342 | break; | |
343 | case XFRM_MODE_TUNNEL: | |
344 | if (inner_mode->family == AF_INET) | |
345 | return xfrm4_remove_tunnel_encap(x, skb); | |
346 | if (inner_mode->family == AF_INET6) | |
347 | return xfrm6_remove_tunnel_encap(x, skb); | |
348 | break; | |
349 | } | |
350 | ||
351 | WARN_ON_ONCE(1); | |
352 | return -EOPNOTSUPP; | |
353 | } | |
354 | ||
c2d305e5 | 355 | static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb) |
227620e2 | 356 | { |
c9500d7b | 357 | const struct xfrm_mode *inner_mode = &x->inner_mode; |
227620e2 | 358 | |
a269fbfc FW |
359 | switch (x->outer_mode.family) { |
360 | case AF_INET: | |
361 | xfrm4_extract_header(skb); | |
362 | break; | |
363 | case AF_INET6: | |
364 | xfrm6_extract_header(skb); | |
365 | break; | |
366 | default: | |
367 | WARN_ON_ONCE(1); | |
368 | return -EAFNOSUPPORT; | |
369 | } | |
227620e2 | 370 | |
df9dcb45 KM |
371 | if (x->sel.family == AF_UNSPEC) { |
372 | inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); | |
4c203b04 | 373 | if (!inner_mode) |
df9dcb45 KM |
374 | return -EAFNOSUPPORT; |
375 | } | |
376 | ||
4c203b04 FW |
377 | switch (inner_mode->family) { |
378 | case AF_INET: | |
379 | skb->protocol = htons(ETH_P_IP); | |
380 | break; | |
381 | case AF_INET6: | |
382 | skb->protocol = htons(ETH_P_IPV6); | |
1be451d9 | 383 | break; |
4c203b04 FW |
384 | default: |
385 | WARN_ON_ONCE(1); | |
386 | break; | |
733a5fac FW |
387 | } |
388 | ||
b3284df1 | 389 | return xfrm_inner_mode_encap_remove(x, inner_mode, skb); |
227620e2 | 390 | } |
c2d305e5 FW |
391 | |
392 | /* Remove encapsulation header. | |
393 | * | |
394 | * The IP header will be moved over the top of the encapsulation header. | |
395 | * | |
396 | * On entry, skb_transport_header() shall point to where the IP header | |
397 | * should be and skb_network_header() shall be set to where the IP header | |
398 | * currently is. skb->data shall point to the start of the payload. | |
399 | */ | |
400 | static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb) | |
401 | { | |
c2d305e5 FW |
402 | int ihl = skb->data - skb_transport_header(skb); |
403 | ||
404 | if (skb->transport_header != skb->network_header) { | |
405 | memmove(skb_transport_header(skb), | |
406 | skb_network_header(skb), ihl); | |
407 | skb->network_header = skb->transport_header; | |
408 | } | |
409 | ip_hdr(skb)->tot_len = htons(skb->len + ihl); | |
410 | skb_reset_transport_header(skb); | |
411 | return 0; | |
c2d305e5 FW |
412 | } |
413 | ||
414 | static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb) | |
415 | { | |
4c145dce | 416 | #if IS_ENABLED(CONFIG_IPV6) |
c2d305e5 FW |
417 | int ihl = skb->data - skb_transport_header(skb); |
418 | ||
419 | if (skb->transport_header != skb->network_header) { | |
420 | memmove(skb_transport_header(skb), | |
421 | skb_network_header(skb), ihl); | |
422 | skb->network_header = skb->transport_header; | |
423 | } | |
424 | ipv6_hdr(skb)->payload_len = htons(skb->len + ihl - | |
425 | sizeof(struct ipv6hdr)); | |
426 | skb_reset_transport_header(skb); | |
427 | return 0; | |
428 | #else | |
4c145dce FW |
429 | WARN_ON_ONCE(1); |
430 | return -EAFNOSUPPORT; | |
c2d305e5 FW |
431 | #endif |
432 | } | |
433 | ||
434 | static int xfrm_inner_mode_input(struct xfrm_state *x, | |
435 | const struct xfrm_mode *inner_mode, | |
436 | struct sk_buff *skb) | |
437 | { | |
438 | switch (inner_mode->encap) { | |
439 | case XFRM_MODE_BEET: | |
440 | case XFRM_MODE_TUNNEL: | |
441 | return xfrm_prepare_input(x, skb); | |
442 | case XFRM_MODE_TRANSPORT: | |
443 | if (inner_mode->family == AF_INET) | |
444 | return xfrm4_transport_input(x, skb); | |
445 | if (inner_mode->family == AF_INET6) | |
446 | return xfrm6_transport_input(x, skb); | |
447 | break; | |
448 | case XFRM_MODE_ROUTEOPTIMIZATION: | |
449 | WARN_ON_ONCE(1); | |
450 | break; | |
451 | default: | |
452 | WARN_ON_ONCE(1); | |
453 | break; | |
454 | } | |
455 | ||
456 | return -EOPNOTSUPP; | |
457 | } | |
227620e2 | 458 | |
716062fd HX |
459 | int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) |
460 | { | |
733a5fac | 461 | const struct xfrm_state_afinfo *afinfo; |
bd235e3c | 462 | struct net *net = dev_net(skb->dev); |
4c145dce | 463 | const struct xfrm_mode *inner_mode; |
716062fd HX |
464 | int err; |
465 | __be32 seq; | |
2cd08467 | 466 | __be32 seq_hi; |
3328715e | 467 | struct xfrm_state *x = NULL; |
1bf06cd2 | 468 | xfrm_address_t *daddr; |
049f8e2e | 469 | u32 mark = skb->mark; |
4ce3dbe3 | 470 | unsigned int family = AF_UNSPEC; |
716062fd | 471 | int decaps = 0; |
1bf06cd2 | 472 | int async = 0; |
7785bba2 | 473 | bool xfrm_gro = false; |
d77e38e6 SK |
474 | bool crypto_done = false; |
475 | struct xfrm_offload *xo = xfrm_offload(skb); | |
0ca64da1 | 476 | struct sec_path *sp; |
1bf06cd2 | 477 | |
1bf06cd2 | 478 | if (encap_type < 0) { |
00501121 | 479 | x = xfrm_input_state(skb); |
4ce3dbe3 AH |
480 | |
481 | if (unlikely(x->km.state != XFRM_STATE_VALID)) { | |
482 | if (x->km.state == XFRM_STATE_ACQ) | |
483 | XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR); | |
484 | else | |
485 | XFRM_INC_STATS(net, | |
486 | LINUX_MIB_XFRMINSTATEINVALID); | |
4944a4b1 XX |
487 | |
488 | if (encap_type == -1) | |
489 | dev_put(skb->dev); | |
4ce3dbe3 AH |
490 | goto drop; |
491 | } | |
492 | ||
c9500d7b | 493 | family = x->outer_mode.family; |
7785bba2 SK |
494 | |
495 | /* An encap_type of -1 indicates async resumption. */ | |
496 | if (encap_type == -1) { | |
497 | async = 1; | |
498 | seq = XFRM_SKB_CB(skb)->seq.input.low; | |
499 | goto resume; | |
500 | } | |
bcd1f8a4 | 501 | |
7785bba2 SK |
502 | /* encap_type < -1 indicates a GRO call. */ |
503 | encap_type = 0; | |
504 | seq = XFRM_SPI_SKB_CB(skb)->seq; | |
716062fd | 505 | |
bcd1f8a4 SK |
506 | if (xo && (xo->flags & CRYPTO_DONE)) { |
507 | crypto_done = true; | |
bcd1f8a4 SK |
508 | family = XFRM_SPI_SKB_CB(skb)->family; |
509 | ||
510 | if (!(xo->status & CRYPTO_SUCCESS)) { | |
511 | if (xo->status & | |
512 | (CRYPTO_TRANSPORT_AH_AUTH_FAILED | | |
513 | CRYPTO_TRANSPORT_ESP_AUTH_FAILED | | |
514 | CRYPTO_TUNNEL_AH_AUTH_FAILED | | |
515 | CRYPTO_TUNNEL_ESP_AUTH_FAILED)) { | |
516 | ||
517 | xfrm_audit_state_icvfail(x, skb, | |
518 | x->type->proto); | |
519 | x->stats.integrity_failed++; | |
520 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); | |
521 | goto drop; | |
522 | } | |
523 | ||
47ebcc0b YK |
524 | if (xo->status & CRYPTO_INVALID_PROTOCOL) { |
525 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); | |
526 | goto drop; | |
527 | } | |
528 | ||
bcd1f8a4 | 529 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
d77e38e6 SK |
530 | goto drop; |
531 | } | |
532 | ||
bcd1f8a4 SK |
533 | if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) { |
534 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); | |
535 | goto drop; | |
536 | } | |
d77e38e6 SK |
537 | } |
538 | ||
7785bba2 | 539 | goto lock; |
1bf06cd2 | 540 | } |
716062fd | 541 | |
3328715e SK |
542 | family = XFRM_SPI_SKB_CB(skb)->family; |
543 | ||
049f8e2e | 544 | /* if tunnel is present override skb->mark value with tunnel i_key */ |
1625f452 AK |
545 | switch (family) { |
546 | case AF_INET: | |
547 | if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) | |
049f8e2e | 548 | mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key); |
1625f452 AK |
549 | break; |
550 | case AF_INET6: | |
551 | if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) | |
049f8e2e | 552 | mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key); |
1625f452 | 553 | break; |
049f8e2e AD |
554 | } |
555 | ||
0ca64da1 FW |
556 | sp = secpath_set(skb); |
557 | if (!sp) { | |
b0fcee82 SK |
558 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); |
559 | goto drop; | |
b2aa5e9d HX |
560 | } |
561 | ||
716062fd | 562 | seq = 0; |
0aa64774 | 563 | if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) { |
f203b76d | 564 | secpath_reset(skb); |
59c9940e | 565 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
716062fd | 566 | goto drop; |
0aa64774 | 567 | } |
716062fd | 568 | |
cb79a180 FW |
569 | daddr = (xfrm_address_t *)(skb_network_header(skb) + |
570 | XFRM_SPI_SKB_CB(skb)->daddroff); | |
716062fd | 571 | do { |
2294be0f FW |
572 | sp = skb_sec_path(skb); |
573 | ||
574 | if (sp->len == XFRM_MAX_DEPTH) { | |
f203b76d | 575 | secpath_reset(skb); |
59c9940e | 576 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
716062fd | 577 | goto drop; |
0aa64774 | 578 | } |
716062fd | 579 | |
049f8e2e | 580 | x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family); |
0aa64774 | 581 | if (x == NULL) { |
f203b76d | 582 | secpath_reset(skb); |
59c9940e | 583 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES); |
afeb14b4 | 584 | xfrm_audit_state_notfound(skb, family, spi, seq); |
716062fd | 585 | goto drop; |
0aa64774 | 586 | } |
716062fd | 587 | |
9b42c1f1 SK |
588 | skb->mark = xfrm_smark_get(skb->mark, x); |
589 | ||
2294be0f | 590 | sp->xvec[sp->len++] = x; |
b2aa5e9d | 591 | |
0152eee6 SK |
592 | skb_dst_force(skb); |
593 | if (!skb_dst(skb)) { | |
594 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); | |
595 | goto drop; | |
596 | } | |
597 | ||
7785bba2 | 598 | lock: |
716062fd | 599 | spin_lock(&x->lock); |
4c4d41f2 | 600 | |
0aa64774 | 601 | if (unlikely(x->km.state != XFRM_STATE_VALID)) { |
dc0565ce LR |
602 | if (x->km.state == XFRM_STATE_ACQ) |
603 | XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR); | |
604 | else | |
605 | XFRM_INC_STATS(net, | |
606 | LINUX_MIB_XFRMINSTATEINVALID); | |
716062fd | 607 | goto drop_unlock; |
0aa64774 | 608 | } |
716062fd | 609 | |
3de77cf2 DM |
610 | if ((x->encap ? x->encap->encap_type : 0) != encap_type) { |
611 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); | |
612 | goto drop_unlock; | |
613 | } | |
614 | ||
adfc2fdb | 615 | if (xfrm_replay_check(x, skb, seq)) { |
59c9940e | 616 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); |
716062fd | 617 | goto drop_unlock; |
0aa64774 | 618 | } |
716062fd | 619 | |
0aa64774 | 620 | if (xfrm_state_check_expire(x)) { |
59c9940e | 621 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED); |
716062fd | 622 | goto drop_unlock; |
0aa64774 | 623 | } |
716062fd | 624 | |
0ebea8ef HX |
625 | spin_unlock(&x->lock); |
626 | ||
68c11e98 AD |
627 | if (xfrm_tunnel_check(skb, x, family)) { |
628 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); | |
629 | goto drop; | |
630 | } | |
631 | ||
2cd08467 SK |
632 | seq_hi = htonl(xfrm_replay_seqhi(x, seq)); |
633 | ||
1ce3644a | 634 | XFRM_SKB_CB(skb)->seq.input.low = seq; |
2cd08467 | 635 | XFRM_SKB_CB(skb)->seq.input.hi = seq_hi; |
1bf06cd2 | 636 | |
071d36bf | 637 | dev_hold(skb->dev); |
3bc07321 | 638 | |
d77e38e6 SK |
639 | if (crypto_done) |
640 | nexthdr = x->type_offload->input_tail(x, skb); | |
641 | else | |
642 | nexthdr = x->type->input(x, skb); | |
0ebea8ef | 643 | |
1bf06cd2 HX |
644 | if (nexthdr == -EINPROGRESS) |
645 | return 0; | |
1bf06cd2 | 646 | resume: |
071d36bf SAK |
647 | dev_put(skb->dev); |
648 | ||
0ebea8ef | 649 | spin_lock(&x->lock); |
afcaf61b | 650 | if (nexthdr < 0) { |
9dd3245a HX |
651 | if (nexthdr == -EBADMSG) { |
652 | xfrm_audit_state_icvfail(x, skb, | |
653 | x->type->proto); | |
668dc8af | 654 | x->stats.integrity_failed++; |
9dd3245a | 655 | } |
59c9940e | 656 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); |
716062fd | 657 | goto drop_unlock; |
668dc8af | 658 | } |
716062fd | 659 | |
716062fd HX |
660 | /* only the first xfrm gets the encap type */ |
661 | encap_type = 0; | |
662 | ||
25cfb8bc | 663 | if (xfrm_replay_recheck(x, skb, seq)) { |
bcf66bf5 SK |
664 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); |
665 | goto drop_unlock; | |
666 | } | |
667 | ||
c7f87783 | 668 | xfrm_replay_advance(x, seq); |
716062fd HX |
669 | |
670 | x->curlft.bytes += skb->len; | |
671 | x->curlft.packets++; | |
672 | ||
673 | spin_unlock(&x->lock); | |
674 | ||
60d5fcfb HX |
675 | XFRM_MODE_SKB_CB(skb)->protocol = nexthdr; |
676 | ||
c9500d7b | 677 | inner_mode = &x->inner_mode; |
df9dcb45 KM |
678 | |
679 | if (x->sel.family == AF_UNSPEC) { | |
680 | inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); | |
cb866e32 SK |
681 | if (inner_mode == NULL) { |
682 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); | |
df9dcb45 | 683 | goto drop; |
cb866e32 | 684 | } |
df9dcb45 KM |
685 | } |
686 | ||
c2d305e5 | 687 | if (xfrm_inner_mode_input(x, inner_mode, skb)) { |
59c9940e | 688 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); |
716062fd | 689 | goto drop; |
0aa64774 | 690 | } |
716062fd | 691 | |
c9500d7b | 692 | if (x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL) { |
716062fd HX |
693 | decaps = 1; |
694 | break; | |
695 | } | |
696 | ||
1bf06cd2 HX |
697 | /* |
698 | * We need the inner address. However, we only get here for | |
699 | * transport mode so the outer address is identical. | |
700 | */ | |
701 | daddr = &x->id.daddr; | |
c9500d7b | 702 | family = x->outer_mode.family; |
1bf06cd2 | 703 | |
716062fd | 704 | err = xfrm_parse_spi(skb, nexthdr, &spi, &seq); |
0aa64774 | 705 | if (err < 0) { |
59c9940e | 706 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
716062fd | 707 | goto drop; |
0aa64774 | 708 | } |
782710e3 | 709 | crypto_done = false; |
716062fd HX |
710 | } while (!err); |
711 | ||
3328715e SK |
712 | err = xfrm_rcv_cb(skb, family, x->type->proto, 0); |
713 | if (err) | |
714 | goto drop; | |
715 | ||
895b5c9f | 716 | nf_reset_ct(skb); |
716062fd HX |
717 | |
718 | if (decaps) { | |
2294be0f FW |
719 | sp = skb_sec_path(skb); |
720 | if (sp) | |
721 | sp->olen = 0; | |
adf30907 | 722 | skb_dst_drop(skb); |
1995876a | 723 | gro_cells_receive(&gro_cells, skb); |
716062fd HX |
724 | return 0; |
725 | } else { | |
7785bba2 SK |
726 | xo = xfrm_offload(skb); |
727 | if (xo) | |
728 | xfrm_gro = xo->flags & XFRM_GRO; | |
729 | ||
733a5fac FW |
730 | err = -EAFNOSUPPORT; |
731 | rcu_read_lock(); | |
c9500d7b | 732 | afinfo = xfrm_state_afinfo_get_rcu(x->inner_mode.family); |
733a5fac FW |
733 | if (likely(afinfo)) |
734 | err = afinfo->transport_finish(skb, xfrm_gro || async); | |
735 | rcu_read_unlock(); | |
7785bba2 | 736 | if (xfrm_gro) { |
2294be0f FW |
737 | sp = skb_sec_path(skb); |
738 | if (sp) | |
739 | sp->olen = 0; | |
7785bba2 SK |
740 | skb_dst_drop(skb); |
741 | gro_cells_receive(&gro_cells, skb); | |
742 | return err; | |
743 | } | |
744 | ||
745 | return err; | |
716062fd HX |
746 | } |
747 | ||
748 | drop_unlock: | |
749 | spin_unlock(&x->lock); | |
716062fd | 750 | drop: |
3328715e | 751 | xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1); |
716062fd HX |
752 | kfree_skb(skb); |
753 | return 0; | |
754 | } | |
755 | EXPORT_SYMBOL(xfrm_input); | |
756 | ||
1bf06cd2 HX |
757 | int xfrm_input_resume(struct sk_buff *skb, int nexthdr) |
758 | { | |
759 | return xfrm_input(skb, nexthdr, 0, -1); | |
760 | } | |
761 | EXPORT_SYMBOL(xfrm_input_resume); | |
762 | ||
158d31da | 763 | static void xfrm_trans_reinject(struct tasklet_struct *t) |
acf568ee | 764 | { |
158d31da | 765 | struct xfrm_trans_tasklet *trans = from_tasklet(trans, t, tasklet); |
acf568ee HX |
766 | struct sk_buff_head queue; |
767 | struct sk_buff *skb; | |
768 | ||
769 | __skb_queue_head_init(&queue); | |
770 | skb_queue_splice_init(&trans->queue, &queue); | |
771 | ||
772 | while ((skb = __skb_dequeue(&queue))) | |
7b380192 SD |
773 | XFRM_TRANS_SKB_CB(skb)->finish(XFRM_TRANS_SKB_CB(skb)->net, |
774 | NULL, skb); | |
acf568ee HX |
775 | } |
776 | ||
7b380192 SD |
777 | int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, |
778 | int (*finish)(struct net *, struct sock *, | |
779 | struct sk_buff *)) | |
acf568ee HX |
780 | { |
781 | struct xfrm_trans_tasklet *trans; | |
782 | ||
783 | trans = this_cpu_ptr(&xfrm_trans_tasklet); | |
784 | ||
785 | if (skb_queue_len(&trans->queue) >= netdev_max_backlog) | |
786 | return -ENOBUFS; | |
787 | ||
7b380192 SD |
788 | BUILD_BUG_ON(sizeof(struct xfrm_trans_cb) > sizeof(skb->cb)); |
789 | ||
acf568ee | 790 | XFRM_TRANS_SKB_CB(skb)->finish = finish; |
7b380192 | 791 | XFRM_TRANS_SKB_CB(skb)->net = net; |
d16b46e4 | 792 | __skb_queue_tail(&trans->queue, skb); |
acf568ee HX |
793 | tasklet_schedule(&trans->tasklet); |
794 | return 0; | |
795 | } | |
7b380192 SD |
796 | EXPORT_SYMBOL(xfrm_trans_queue_net); |
797 | ||
798 | int xfrm_trans_queue(struct sk_buff *skb, | |
799 | int (*finish)(struct net *, struct sock *, | |
800 | struct sk_buff *)) | |
801 | { | |
802 | return xfrm_trans_queue_net(dev_net(skb->dev), skb, finish); | |
803 | } | |
acf568ee HX |
804 | EXPORT_SYMBOL(xfrm_trans_queue); |
805 | ||
1da177e4 LT |
806 | void __init xfrm_input_init(void) |
807 | { | |
1995876a | 808 | int err; |
acf568ee | 809 | int i; |
1995876a SK |
810 | |
811 | init_dummy_netdev(&xfrm_napi_dev); | |
812 | err = gro_cells_init(&gro_cells, &xfrm_napi_dev); | |
813 | if (err) | |
814 | gro_cells.cells = NULL; | |
815 | ||
acf568ee HX |
816 | for_each_possible_cpu(i) { |
817 | struct xfrm_trans_tasklet *trans; | |
818 | ||
819 | trans = &per_cpu(xfrm_trans_tasklet, i); | |
820 | __skb_queue_head_init(&trans->queue); | |
158d31da | 821 | tasklet_setup(&trans->tasklet, xfrm_trans_reinject); |
acf568ee | 822 | } |
1da177e4 | 823 | } |