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1/*
2 * xfrm_input.c
3 *
4 * Changes:
5 * YOSHIFUJI Hideaki @USAGI
6 * Split up af-specific portion
7 *
8 */
9
10#include <linux/slab.h>
11#include <linux/module.h>
12#include <linux/netdevice.h>
13#include <net/dst.h>
14#include <net/ip.h>
15#include <net/xfrm.h>
16#include <net/ip_tunnels.h>
17#include <net/ip6_tunnel.h>
18
19static struct kmem_cache *secpath_cachep __read_mostly;
20
21static DEFINE_SPINLOCK(xfrm_input_afinfo_lock);
22static struct xfrm_input_afinfo __rcu *xfrm_input_afinfo[NPROTO];
23
24int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo)
25{
26 int err = 0;
27
28 if (unlikely(afinfo == NULL))
29 return -EINVAL;
30 if (unlikely(afinfo->family >= NPROTO))
31 return -EAFNOSUPPORT;
32 spin_lock_bh(&xfrm_input_afinfo_lock);
33 if (unlikely(xfrm_input_afinfo[afinfo->family] != NULL))
34 err = -EEXIST;
35 else
36 rcu_assign_pointer(xfrm_input_afinfo[afinfo->family], afinfo);
37 spin_unlock_bh(&xfrm_input_afinfo_lock);
38 return err;
39}
40EXPORT_SYMBOL(xfrm_input_register_afinfo);
41
42int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo)
43{
44 int err = 0;
45
46 if (unlikely(afinfo == NULL))
47 return -EINVAL;
48 if (unlikely(afinfo->family >= NPROTO))
49 return -EAFNOSUPPORT;
50 spin_lock_bh(&xfrm_input_afinfo_lock);
51 if (likely(xfrm_input_afinfo[afinfo->family] != NULL)) {
52 if (unlikely(xfrm_input_afinfo[afinfo->family] != afinfo))
53 err = -EINVAL;
54 else
55 RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->family], NULL);
56 }
57 spin_unlock_bh(&xfrm_input_afinfo_lock);
58 synchronize_rcu();
59 return err;
60}
61EXPORT_SYMBOL(xfrm_input_unregister_afinfo);
62
63static struct xfrm_input_afinfo *xfrm_input_get_afinfo(unsigned int family)
64{
65 struct xfrm_input_afinfo *afinfo;
66
67 if (unlikely(family >= NPROTO))
68 return NULL;
69 rcu_read_lock();
70 afinfo = rcu_dereference(xfrm_input_afinfo[family]);
71 if (unlikely(!afinfo))
72 rcu_read_unlock();
73 return afinfo;
74}
75
76static void xfrm_input_put_afinfo(struct xfrm_input_afinfo *afinfo)
77{
78 rcu_read_unlock();
79}
80
81static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol,
82 int err)
83{
84 int ret;
85 struct xfrm_input_afinfo *afinfo = xfrm_input_get_afinfo(family);
86
87 if (!afinfo)
88 return -EAFNOSUPPORT;
89
90 ret = afinfo->callback(skb, protocol, err);
91 xfrm_input_put_afinfo(afinfo);
92
93 return ret;
94}
95
96void __secpath_destroy(struct sec_path *sp)
97{
98 int i;
99 for (i = 0; i < sp->len; i++)
100 xfrm_state_put(sp->xvec[i]);
101 kmem_cache_free(secpath_cachep, sp);
102}
103EXPORT_SYMBOL(__secpath_destroy);
104
105struct sec_path *secpath_dup(struct sec_path *src)
106{
107 struct sec_path *sp;
108
109 sp = kmem_cache_alloc(secpath_cachep, GFP_ATOMIC);
110 if (!sp)
111 return NULL;
112
113 sp->len = 0;
114 if (src) {
115 int i;
116
117 memcpy(sp, src, sizeof(*sp));
118 for (i = 0; i < sp->len; i++)
119 xfrm_state_hold(sp->xvec[i]);
120 }
121 atomic_set(&sp->refcnt, 1);
122 return sp;
123}
124EXPORT_SYMBOL(secpath_dup);
125
126/* Fetch spi and seq from ipsec header */
127
128int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
129{
130 int offset, offset_seq;
131 int hlen;
132
133 switch (nexthdr) {
134 case IPPROTO_AH:
135 hlen = sizeof(struct ip_auth_hdr);
136 offset = offsetof(struct ip_auth_hdr, spi);
137 offset_seq = offsetof(struct ip_auth_hdr, seq_no);
138 break;
139 case IPPROTO_ESP:
140 hlen = sizeof(struct ip_esp_hdr);
141 offset = offsetof(struct ip_esp_hdr, spi);
142 offset_seq = offsetof(struct ip_esp_hdr, seq_no);
143 break;
144 case IPPROTO_COMP:
145 if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr)))
146 return -EINVAL;
147 *spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2)));
148 *seq = 0;
149 return 0;
150 default:
151 return 1;
152 }
153
154 if (!pskb_may_pull(skb, hlen))
155 return -EINVAL;
156
157 *spi = *(__be32 *)(skb_transport_header(skb) + offset);
158 *seq = *(__be32 *)(skb_transport_header(skb) + offset_seq);
159 return 0;
160}
161
162int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
163{
164 struct xfrm_mode *inner_mode = x->inner_mode;
165 int err;
166
167 err = x->outer_mode->afinfo->extract_input(x, skb);
168 if (err)
169 return err;
170
171 if (x->sel.family == AF_UNSPEC) {
172 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
173 if (inner_mode == NULL)
174 return -EAFNOSUPPORT;
175 }
176
177 skb->protocol = inner_mode->afinfo->eth_proto;
178 return inner_mode->input2(x, skb);
179}
180EXPORT_SYMBOL(xfrm_prepare_input);
181
182int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
183{
184 struct net *net = dev_net(skb->dev);
185 int err;
186 __be32 seq;
187 __be32 seq_hi;
188 struct xfrm_state *x = NULL;
189 xfrm_address_t *daddr;
190 struct xfrm_mode *inner_mode;
191 u32 mark = skb->mark;
192 unsigned int family;
193 int decaps = 0;
194 int async = 0;
195
196 /* A negative encap_type indicates async resumption. */
197 if (encap_type < 0) {
198 async = 1;
199 x = xfrm_input_state(skb);
200 seq = XFRM_SKB_CB(skb)->seq.input.low;
201 family = x->outer_mode->afinfo->family;
202 goto resume;
203 }
204
205 daddr = (xfrm_address_t *)(skb_network_header(skb) +
206 XFRM_SPI_SKB_CB(skb)->daddroff);
207 family = XFRM_SPI_SKB_CB(skb)->family;
208
209 /* if tunnel is present override skb->mark value with tunnel i_key */
210 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) {
211 switch (family) {
212 case AF_INET:
213 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key);
214 break;
215 case AF_INET6:
216 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key);
217 break;
218 }
219 }
220
221 /* Allocate new secpath or COW existing one. */
222 if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
223 struct sec_path *sp;
224
225 sp = secpath_dup(skb->sp);
226 if (!sp) {
227 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
228 goto drop;
229 }
230 if (skb->sp)
231 secpath_put(skb->sp);
232 skb->sp = sp;
233 }
234
235 seq = 0;
236 if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
237 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
238 goto drop;
239 }
240
241 do {
242 if (skb->sp->len == XFRM_MAX_DEPTH) {
243 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
244 goto drop;
245 }
246
247 x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family);
248 if (x == NULL) {
249 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
250 xfrm_audit_state_notfound(skb, family, spi, seq);
251 goto drop;
252 }
253
254 skb->sp->xvec[skb->sp->len++] = x;
255
256 spin_lock(&x->lock);
257
258 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
259 if (x->km.state == XFRM_STATE_ACQ)
260 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
261 else
262 XFRM_INC_STATS(net,
263 LINUX_MIB_XFRMINSTATEINVALID);
264 goto drop_unlock;
265 }
266
267 if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
268 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
269 goto drop_unlock;
270 }
271
272 if (x->repl->check(x, skb, seq)) {
273 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
274 goto drop_unlock;
275 }
276
277 if (xfrm_state_check_expire(x)) {
278 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED);
279 goto drop_unlock;
280 }
281
282 spin_unlock(&x->lock);
283
284 if (xfrm_tunnel_check(skb, x, family)) {
285 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
286 goto drop;
287 }
288
289 seq_hi = htonl(xfrm_replay_seqhi(x, seq));
290
291 XFRM_SKB_CB(skb)->seq.input.low = seq;
292 XFRM_SKB_CB(skb)->seq.input.hi = seq_hi;
293
294 skb_dst_force(skb);
295 dev_hold(skb->dev);
296
297 nexthdr = x->type->input(x, skb);
298
299 if (nexthdr == -EINPROGRESS)
300 return 0;
301resume:
302 dev_put(skb->dev);
303
304 spin_lock(&x->lock);
305 if (nexthdr <= 0) {
306 if (nexthdr == -EBADMSG) {
307 xfrm_audit_state_icvfail(x, skb,
308 x->type->proto);
309 x->stats.integrity_failed++;
310 }
311 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
312 goto drop_unlock;
313 }
314
315 /* only the first xfrm gets the encap type */
316 encap_type = 0;
317
318 if (async && x->repl->recheck(x, skb, seq)) {
319 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
320 goto drop_unlock;
321 }
322
323 x->repl->advance(x, seq);
324
325 x->curlft.bytes += skb->len;
326 x->curlft.packets++;
327
328 spin_unlock(&x->lock);
329
330 XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
331
332 inner_mode = x->inner_mode;
333
334 if (x->sel.family == AF_UNSPEC) {
335 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
336 if (inner_mode == NULL) {
337 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
338 goto drop;
339 }
340 }
341
342 if (inner_mode->input(x, skb)) {
343 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
344 goto drop;
345 }
346
347 if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {
348 decaps = 1;
349 break;
350 }
351
352 /*
353 * We need the inner address. However, we only get here for
354 * transport mode so the outer address is identical.
355 */
356 daddr = &x->id.daddr;
357 family = x->outer_mode->afinfo->family;
358
359 err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
360 if (err < 0) {
361 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
362 goto drop;
363 }
364 } while (!err);
365
366 err = xfrm_rcv_cb(skb, family, x->type->proto, 0);
367 if (err)
368 goto drop;
369
370 nf_reset(skb);
371
372 if (decaps) {
373 skb_dst_drop(skb);
374 netif_rx(skb);
375 return 0;
376 } else {
377 return x->inner_mode->afinfo->transport_finish(skb, async);
378 }
379
380drop_unlock:
381 spin_unlock(&x->lock);
382drop:
383 xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1);
384 kfree_skb(skb);
385 return 0;
386}
387EXPORT_SYMBOL(xfrm_input);
388
389int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
390{
391 return xfrm_input(skb, nexthdr, 0, -1);
392}
393EXPORT_SYMBOL(xfrm_input_resume);
394
395void __init xfrm_input_init(void)
396{
397 secpath_cachep = kmem_cache_create("secpath_cache",
398 sizeof(struct sec_path),
399 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
400 NULL);
401}
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
24struct xfrm_trans_tasklet {
25 struct tasklet_struct tasklet;
26 struct sk_buff_head queue;
27};
28
29struct xfrm_trans_cb {
30 union {
31 struct inet_skb_parm h4;
32#if IS_ENABLED(CONFIG_IPV6)
33 struct inet6_skb_parm h6;
34#endif
35 } header;
36 int (*finish)(struct net *net, struct sock *sk, struct sk_buff *skb);
37};
38
39#define XFRM_TRANS_SKB_CB(__skb) ((struct xfrm_trans_cb *)&((__skb)->cb[0]))
40
41static struct kmem_cache *secpath_cachep __ro_after_init;
42
43static DEFINE_SPINLOCK(xfrm_input_afinfo_lock);
44static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[AF_INET6 + 1];
45
46static struct gro_cells gro_cells;
47static struct net_device xfrm_napi_dev;
48
49static DEFINE_PER_CPU(struct xfrm_trans_tasklet, xfrm_trans_tasklet);
50
51int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo)
52{
53 int err = 0;
54
55 if (WARN_ON(afinfo->family >= ARRAY_SIZE(xfrm_input_afinfo)))
56 return -EAFNOSUPPORT;
57
58 spin_lock_bh(&xfrm_input_afinfo_lock);
59 if (unlikely(xfrm_input_afinfo[afinfo->family] != NULL))
60 err = -EEXIST;
61 else
62 rcu_assign_pointer(xfrm_input_afinfo[afinfo->family], afinfo);
63 spin_unlock_bh(&xfrm_input_afinfo_lock);
64 return err;
65}
66EXPORT_SYMBOL(xfrm_input_register_afinfo);
67
68int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo)
69{
70 int err = 0;
71
72 spin_lock_bh(&xfrm_input_afinfo_lock);
73 if (likely(xfrm_input_afinfo[afinfo->family] != NULL)) {
74 if (unlikely(xfrm_input_afinfo[afinfo->family] != afinfo))
75 err = -EINVAL;
76 else
77 RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->family], NULL);
78 }
79 spin_unlock_bh(&xfrm_input_afinfo_lock);
80 synchronize_rcu();
81 return err;
82}
83EXPORT_SYMBOL(xfrm_input_unregister_afinfo);
84
85static const struct xfrm_input_afinfo *xfrm_input_get_afinfo(unsigned int family)
86{
87 const struct xfrm_input_afinfo *afinfo;
88
89 if (WARN_ON_ONCE(family >= ARRAY_SIZE(xfrm_input_afinfo)))
90 return NULL;
91
92 rcu_read_lock();
93 afinfo = rcu_dereference(xfrm_input_afinfo[family]);
94 if (unlikely(!afinfo))
95 rcu_read_unlock();
96 return afinfo;
97}
98
99static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol,
100 int err)
101{
102 int ret;
103 const struct xfrm_input_afinfo *afinfo = xfrm_input_get_afinfo(family);
104
105 if (!afinfo)
106 return -EAFNOSUPPORT;
107
108 ret = afinfo->callback(skb, protocol, err);
109 rcu_read_unlock();
110
111 return ret;
112}
113
114void __secpath_destroy(struct sec_path *sp)
115{
116 int i;
117 for (i = 0; i < sp->len; i++)
118 xfrm_state_put(sp->xvec[i]);
119 kmem_cache_free(secpath_cachep, sp);
120}
121EXPORT_SYMBOL(__secpath_destroy);
122
123struct sec_path *secpath_dup(struct sec_path *src)
124{
125 struct sec_path *sp;
126
127 sp = kmem_cache_alloc(secpath_cachep, GFP_ATOMIC);
128 if (!sp)
129 return NULL;
130
131 sp->len = 0;
132 sp->olen = 0;
133
134 memset(sp->ovec, 0, sizeof(sp->ovec[XFRM_MAX_OFFLOAD_DEPTH]));
135
136 if (src) {
137 int i;
138
139 memcpy(sp, src, sizeof(*sp));
140 for (i = 0; i < sp->len; i++)
141 xfrm_state_hold(sp->xvec[i]);
142 }
143 refcount_set(&sp->refcnt, 1);
144 return sp;
145}
146EXPORT_SYMBOL(secpath_dup);
147
148int secpath_set(struct sk_buff *skb)
149{
150 struct sec_path *sp;
151
152 /* Allocate new secpath or COW existing one. */
153 if (!skb->sp || refcount_read(&skb->sp->refcnt) != 1) {
154 sp = secpath_dup(skb->sp);
155 if (!sp)
156 return -ENOMEM;
157
158 if (skb->sp)
159 secpath_put(skb->sp);
160 skb->sp = sp;
161 }
162 return 0;
163}
164EXPORT_SYMBOL(secpath_set);
165
166/* Fetch spi and seq from ipsec header */
167
168int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
169{
170 int offset, offset_seq;
171 int hlen;
172
173 switch (nexthdr) {
174 case IPPROTO_AH:
175 hlen = sizeof(struct ip_auth_hdr);
176 offset = offsetof(struct ip_auth_hdr, spi);
177 offset_seq = offsetof(struct ip_auth_hdr, seq_no);
178 break;
179 case IPPROTO_ESP:
180 hlen = sizeof(struct ip_esp_hdr);
181 offset = offsetof(struct ip_esp_hdr, spi);
182 offset_seq = offsetof(struct ip_esp_hdr, seq_no);
183 break;
184 case IPPROTO_COMP:
185 if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr)))
186 return -EINVAL;
187 *spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2)));
188 *seq = 0;
189 return 0;
190 default:
191 return 1;
192 }
193
194 if (!pskb_may_pull(skb, hlen))
195 return -EINVAL;
196
197 *spi = *(__be32 *)(skb_transport_header(skb) + offset);
198 *seq = *(__be32 *)(skb_transport_header(skb) + offset_seq);
199 return 0;
200}
201EXPORT_SYMBOL(xfrm_parse_spi);
202
203int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
204{
205 struct xfrm_mode *inner_mode = x->inner_mode;
206 int err;
207
208 err = x->outer_mode->afinfo->extract_input(x, skb);
209 if (err)
210 return err;
211
212 if (x->sel.family == AF_UNSPEC) {
213 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
214 if (inner_mode == NULL)
215 return -EAFNOSUPPORT;
216 }
217
218 skb->protocol = inner_mode->afinfo->eth_proto;
219 return inner_mode->input2(x, skb);
220}
221EXPORT_SYMBOL(xfrm_prepare_input);
222
223int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
224{
225 struct net *net = dev_net(skb->dev);
226 int err;
227 __be32 seq;
228 __be32 seq_hi;
229 struct xfrm_state *x = NULL;
230 xfrm_address_t *daddr;
231 struct xfrm_mode *inner_mode;
232 u32 mark = skb->mark;
233 unsigned int family = AF_UNSPEC;
234 int decaps = 0;
235 int async = 0;
236 bool xfrm_gro = false;
237 bool crypto_done = false;
238 struct xfrm_offload *xo = xfrm_offload(skb);
239
240 if (encap_type < 0) {
241 x = xfrm_input_state(skb);
242
243 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
244 if (x->km.state == XFRM_STATE_ACQ)
245 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
246 else
247 XFRM_INC_STATS(net,
248 LINUX_MIB_XFRMINSTATEINVALID);
249 goto drop;
250 }
251
252 family = x->outer_mode->afinfo->family;
253
254 /* An encap_type of -1 indicates async resumption. */
255 if (encap_type == -1) {
256 async = 1;
257 seq = XFRM_SKB_CB(skb)->seq.input.low;
258 goto resume;
259 }
260
261 /* encap_type < -1 indicates a GRO call. */
262 encap_type = 0;
263 seq = XFRM_SPI_SKB_CB(skb)->seq;
264
265 if (xo && (xo->flags & CRYPTO_DONE)) {
266 crypto_done = true;
267 family = XFRM_SPI_SKB_CB(skb)->family;
268
269 if (!(xo->status & CRYPTO_SUCCESS)) {
270 if (xo->status &
271 (CRYPTO_TRANSPORT_AH_AUTH_FAILED |
272 CRYPTO_TRANSPORT_ESP_AUTH_FAILED |
273 CRYPTO_TUNNEL_AH_AUTH_FAILED |
274 CRYPTO_TUNNEL_ESP_AUTH_FAILED)) {
275
276 xfrm_audit_state_icvfail(x, skb,
277 x->type->proto);
278 x->stats.integrity_failed++;
279 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
280 goto drop;
281 }
282
283 if (xo->status & CRYPTO_INVALID_PROTOCOL) {
284 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
285 goto drop;
286 }
287
288 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
289 goto drop;
290 }
291
292 if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
293 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
294 goto drop;
295 }
296 }
297
298 goto lock;
299 }
300
301 family = XFRM_SPI_SKB_CB(skb)->family;
302
303 /* if tunnel is present override skb->mark value with tunnel i_key */
304 switch (family) {
305 case AF_INET:
306 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
307 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key);
308 break;
309 case AF_INET6:
310 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
311 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key);
312 break;
313 }
314
315 err = secpath_set(skb);
316 if (err) {
317 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
318 goto drop;
319 }
320
321 seq = 0;
322 if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
323 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
324 goto drop;
325 }
326
327 daddr = (xfrm_address_t *)(skb_network_header(skb) +
328 XFRM_SPI_SKB_CB(skb)->daddroff);
329 do {
330 if (skb->sp->len == XFRM_MAX_DEPTH) {
331 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
332 goto drop;
333 }
334
335 x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family);
336 if (x == NULL) {
337 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
338 xfrm_audit_state_notfound(skb, family, spi, seq);
339 goto drop;
340 }
341
342 skb->sp->xvec[skb->sp->len++] = x;
343
344lock:
345 spin_lock(&x->lock);
346
347 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
348 if (x->km.state == XFRM_STATE_ACQ)
349 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
350 else
351 XFRM_INC_STATS(net,
352 LINUX_MIB_XFRMINSTATEINVALID);
353 goto drop_unlock;
354 }
355
356 if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
357 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
358 goto drop_unlock;
359 }
360
361 if (x->repl->check(x, skb, seq)) {
362 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
363 goto drop_unlock;
364 }
365
366 if (xfrm_state_check_expire(x)) {
367 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED);
368 goto drop_unlock;
369 }
370
371 spin_unlock(&x->lock);
372
373 if (xfrm_tunnel_check(skb, x, family)) {
374 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
375 goto drop;
376 }
377
378 seq_hi = htonl(xfrm_replay_seqhi(x, seq));
379
380 XFRM_SKB_CB(skb)->seq.input.low = seq;
381 XFRM_SKB_CB(skb)->seq.input.hi = seq_hi;
382
383 skb_dst_force(skb);
384 dev_hold(skb->dev);
385
386 if (crypto_done)
387 nexthdr = x->type_offload->input_tail(x, skb);
388 else
389 nexthdr = x->type->input(x, skb);
390
391 if (nexthdr == -EINPROGRESS)
392 return 0;
393resume:
394 dev_put(skb->dev);
395
396 spin_lock(&x->lock);
397 if (nexthdr <= 0) {
398 if (nexthdr == -EBADMSG) {
399 xfrm_audit_state_icvfail(x, skb,
400 x->type->proto);
401 x->stats.integrity_failed++;
402 }
403 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
404 goto drop_unlock;
405 }
406
407 /* only the first xfrm gets the encap type */
408 encap_type = 0;
409
410 if (async && x->repl->recheck(x, skb, seq)) {
411 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
412 goto drop_unlock;
413 }
414
415 x->repl->advance(x, seq);
416
417 x->curlft.bytes += skb->len;
418 x->curlft.packets++;
419
420 spin_unlock(&x->lock);
421
422 XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
423
424 inner_mode = x->inner_mode;
425
426 if (x->sel.family == AF_UNSPEC) {
427 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
428 if (inner_mode == NULL) {
429 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
430 goto drop;
431 }
432 }
433
434 if (inner_mode->input(x, skb)) {
435 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
436 goto drop;
437 }
438
439 if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {
440 decaps = 1;
441 break;
442 }
443
444 /*
445 * We need the inner address. However, we only get here for
446 * transport mode so the outer address is identical.
447 */
448 daddr = &x->id.daddr;
449 family = x->outer_mode->afinfo->family;
450
451 err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
452 if (err < 0) {
453 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
454 goto drop;
455 }
456 } while (!err);
457
458 err = xfrm_rcv_cb(skb, family, x->type->proto, 0);
459 if (err)
460 goto drop;
461
462 nf_reset(skb);
463
464 if (decaps) {
465 if (skb->sp)
466 skb->sp->olen = 0;
467 skb_dst_drop(skb);
468 gro_cells_receive(&gro_cells, skb);
469 return 0;
470 } else {
471 xo = xfrm_offload(skb);
472 if (xo)
473 xfrm_gro = xo->flags & XFRM_GRO;
474
475 err = x->inner_mode->afinfo->transport_finish(skb, xfrm_gro || async);
476 if (xfrm_gro) {
477 if (skb->sp)
478 skb->sp->olen = 0;
479 skb_dst_drop(skb);
480 gro_cells_receive(&gro_cells, skb);
481 return err;
482 }
483
484 return err;
485 }
486
487drop_unlock:
488 spin_unlock(&x->lock);
489drop:
490 xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1);
491 kfree_skb(skb);
492 return 0;
493}
494EXPORT_SYMBOL(xfrm_input);
495
496int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
497{
498 return xfrm_input(skb, nexthdr, 0, -1);
499}
500EXPORT_SYMBOL(xfrm_input_resume);
501
502static void xfrm_trans_reinject(unsigned long data)
503{
504 struct xfrm_trans_tasklet *trans = (void *)data;
505 struct sk_buff_head queue;
506 struct sk_buff *skb;
507
508 __skb_queue_head_init(&queue);
509 skb_queue_splice_init(&trans->queue, &queue);
510
511 while ((skb = __skb_dequeue(&queue)))
512 XFRM_TRANS_SKB_CB(skb)->finish(dev_net(skb->dev), NULL, skb);
513}
514
515int xfrm_trans_queue(struct sk_buff *skb,
516 int (*finish)(struct net *, struct sock *,
517 struct sk_buff *))
518{
519 struct xfrm_trans_tasklet *trans;
520
521 trans = this_cpu_ptr(&xfrm_trans_tasklet);
522
523 if (skb_queue_len(&trans->queue) >= netdev_max_backlog)
524 return -ENOBUFS;
525
526 XFRM_TRANS_SKB_CB(skb)->finish = finish;
527 __skb_queue_tail(&trans->queue, skb);
528 tasklet_schedule(&trans->tasklet);
529 return 0;
530}
531EXPORT_SYMBOL(xfrm_trans_queue);
532
533void __init xfrm_input_init(void)
534{
535 int err;
536 int i;
537
538 init_dummy_netdev(&xfrm_napi_dev);
539 err = gro_cells_init(&gro_cells, &xfrm_napi_dev);
540 if (err)
541 gro_cells.cells = NULL;
542
543 secpath_cachep = kmem_cache_create("secpath_cache",
544 sizeof(struct sec_path),
545 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
546 NULL);
547
548 for_each_possible_cpu(i) {
549 struct xfrm_trans_tasklet *trans;
550
551 trans = &per_cpu(xfrm_trans_tasklet, i);
552 __skb_queue_head_init(&trans->queue);
553 tasklet_init(&trans->tasklet, xfrm_trans_reinject,
554 (unsigned long)trans);
555 }
556}