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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 | |
17 | static struct kmem_cache *secpath_cachep __read_mostly; |
18 | |
19 | static DEFINE_SPINLOCK(xfrm_input_afinfo_lock); |
20 | static struct xfrm_input_afinfo __rcu *xfrm_input_afinfo[NPROTO]; |
21 | |
22 | int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo) |
23 | { |
24 | int err = 0; |
25 | |
26 | if (unlikely(afinfo == NULL)) |
27 | return -EINVAL; |
28 | if (unlikely(afinfo->family >= NPROTO)) |
29 | return -EAFNOSUPPORT; |
30 | spin_lock_bh(&xfrm_input_afinfo_lock); |
31 | if (unlikely(xfrm_input_afinfo[afinfo->family] != NULL)) |
32 | err = -ENOBUFS; |
33 | else |
34 | rcu_assign_pointer(xfrm_input_afinfo[afinfo->family], afinfo); |
35 | spin_unlock_bh(&xfrm_input_afinfo_lock); |
36 | return err; |
37 | } |
38 | EXPORT_SYMBOL(xfrm_input_register_afinfo); |
39 | |
40 | int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo) |
41 | { |
42 | int err = 0; |
43 | |
44 | if (unlikely(afinfo == NULL)) |
45 | return -EINVAL; |
46 | if (unlikely(afinfo->family >= NPROTO)) |
47 | return -EAFNOSUPPORT; |
48 | spin_lock_bh(&xfrm_input_afinfo_lock); |
49 | if (likely(xfrm_input_afinfo[afinfo->family] != NULL)) { |
50 | if (unlikely(xfrm_input_afinfo[afinfo->family] != afinfo)) |
51 | err = -EINVAL; |
52 | else |
53 | RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->family], NULL); |
54 | } |
55 | spin_unlock_bh(&xfrm_input_afinfo_lock); |
56 | synchronize_rcu(); |
57 | return err; |
58 | } |
59 | EXPORT_SYMBOL(xfrm_input_unregister_afinfo); |
60 | |
61 | static struct xfrm_input_afinfo *xfrm_input_get_afinfo(unsigned int family) |
62 | { |
63 | struct xfrm_input_afinfo *afinfo; |
64 | |
65 | if (unlikely(family >= NPROTO)) |
66 | return NULL; |
67 | rcu_read_lock(); |
68 | afinfo = rcu_dereference(xfrm_input_afinfo[family]); |
69 | if (unlikely(!afinfo)) |
70 | rcu_read_unlock(); |
71 | return afinfo; |
72 | } |
73 | |
74 | static void xfrm_input_put_afinfo(struct xfrm_input_afinfo *afinfo) |
75 | { |
76 | rcu_read_unlock(); |
77 | } |
78 | |
79 | static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol, |
80 | int err) |
81 | { |
82 | int ret; |
83 | struct xfrm_input_afinfo *afinfo = xfrm_input_get_afinfo(family); |
84 | |
85 | if (!afinfo) |
86 | return -EAFNOSUPPORT; |
87 | |
88 | ret = afinfo->callback(skb, protocol, err); |
89 | xfrm_input_put_afinfo(afinfo); |
90 | |
91 | return ret; |
92 | } |
93 | |
94 | void __secpath_destroy(struct sec_path *sp) |
95 | { |
96 | int i; |
97 | for (i = 0; i < sp->len; i++) |
98 | xfrm_state_put(sp->xvec[i]); |
99 | kmem_cache_free(secpath_cachep, sp); |
100 | } |
101 | EXPORT_SYMBOL(__secpath_destroy); |
102 | |
103 | struct sec_path *secpath_dup(struct sec_path *src) |
104 | { |
105 | struct sec_path *sp; |
106 | |
107 | sp = kmem_cache_alloc(secpath_cachep, GFP_ATOMIC); |
108 | if (!sp) |
109 | return NULL; |
110 | |
111 | sp->len = 0; |
112 | if (src) { |
113 | int i; |
114 | |
115 | memcpy(sp, src, sizeof(*sp)); |
116 | for (i = 0; i < sp->len; i++) |
117 | xfrm_state_hold(sp->xvec[i]); |
118 | } |
119 | atomic_set(&sp->refcnt, 1); |
120 | return sp; |
121 | } |
122 | EXPORT_SYMBOL(secpath_dup); |
123 | |
124 | /* Fetch spi and seq from ipsec header */ |
125 | |
126 | int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq) |
127 | { |
128 | int offset, offset_seq; |
129 | int hlen; |
130 | |
131 | switch (nexthdr) { |
132 | case IPPROTO_AH: |
133 | hlen = sizeof(struct ip_auth_hdr); |
134 | offset = offsetof(struct ip_auth_hdr, spi); |
135 | offset_seq = offsetof(struct ip_auth_hdr, seq_no); |
136 | break; |
137 | case IPPROTO_ESP: |
138 | hlen = sizeof(struct ip_esp_hdr); |
139 | offset = offsetof(struct ip_esp_hdr, spi); |
140 | offset_seq = offsetof(struct ip_esp_hdr, seq_no); |
141 | break; |
142 | case IPPROTO_COMP: |
143 | if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr))) |
144 | return -EINVAL; |
145 | *spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2))); |
146 | *seq = 0; |
147 | return 0; |
148 | default: |
149 | return 1; |
150 | } |
151 | |
152 | if (!pskb_may_pull(skb, hlen)) |
153 | return -EINVAL; |
154 | |
155 | *spi = *(__be32 *)(skb_transport_header(skb) + offset); |
156 | *seq = *(__be32 *)(skb_transport_header(skb) + offset_seq); |
157 | return 0; |
158 | } |
159 | |
160 | int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb) |
161 | { |
162 | struct xfrm_mode *inner_mode = x->inner_mode; |
163 | int err; |
164 | |
165 | err = x->outer_mode->afinfo->extract_input(x, skb); |
166 | if (err) |
167 | return err; |
168 | |
169 | if (x->sel.family == AF_UNSPEC) { |
170 | inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); |
171 | if (inner_mode == NULL) |
172 | return -EAFNOSUPPORT; |
173 | } |
174 | |
175 | skb->protocol = inner_mode->afinfo->eth_proto; |
176 | return inner_mode->input2(x, skb); |
177 | } |
178 | EXPORT_SYMBOL(xfrm_prepare_input); |
179 | |
180 | int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) |
181 | { |
182 | struct net *net = dev_net(skb->dev); |
183 | int err; |
184 | __be32 seq; |
185 | __be32 seq_hi; |
186 | struct xfrm_state *x = NULL; |
187 | xfrm_address_t *daddr; |
188 | struct xfrm_mode *inner_mode; |
189 | unsigned int family; |
190 | int decaps = 0; |
191 | int async = 0; |
192 | |
193 | /* A negative encap_type indicates async resumption. */ |
194 | if (encap_type < 0) { |
195 | async = 1; |
196 | x = xfrm_input_state(skb); |
197 | seq = XFRM_SKB_CB(skb)->seq.input.low; |
198 | family = x->outer_mode->afinfo->family; |
199 | goto resume; |
200 | } |
201 | |
202 | daddr = (xfrm_address_t *)(skb_network_header(skb) + |
203 | XFRM_SPI_SKB_CB(skb)->daddroff); |
204 | family = XFRM_SPI_SKB_CB(skb)->family; |
205 | |
206 | /* Allocate new secpath or COW existing one. */ |
207 | if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) { |
208 | struct sec_path *sp; |
209 | |
210 | sp = secpath_dup(skb->sp); |
211 | if (!sp) { |
212 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); |
213 | goto drop; |
214 | } |
215 | if (skb->sp) |
216 | secpath_put(skb->sp); |
217 | skb->sp = sp; |
218 | } |
219 | |
220 | seq = 0; |
221 | if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) { |
222 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
223 | goto drop; |
224 | } |
225 | |
226 | do { |
227 | if (skb->sp->len == XFRM_MAX_DEPTH) { |
228 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
229 | goto drop; |
230 | } |
231 | |
232 | x = xfrm_state_lookup(net, skb->mark, daddr, spi, nexthdr, family); |
233 | if (x == NULL) { |
234 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES); |
235 | xfrm_audit_state_notfound(skb, family, spi, seq); |
236 | goto drop; |
237 | } |
238 | |
239 | skb->sp->xvec[skb->sp->len++] = x; |
240 | |
241 | if (xfrm_tunnel_check(skb, x, family)) { |
242 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); |
243 | goto drop; |
244 | } |
245 | |
246 | spin_lock(&x->lock); |
247 | if (unlikely(x->km.state == XFRM_STATE_ACQ)) { |
248 | XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR); |
249 | goto drop_unlock; |
250 | } |
251 | |
252 | if (unlikely(x->km.state != XFRM_STATE_VALID)) { |
253 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEINVALID); |
254 | goto drop_unlock; |
255 | } |
256 | |
257 | if ((x->encap ? x->encap->encap_type : 0) != encap_type) { |
258 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); |
259 | goto drop_unlock; |
260 | } |
261 | |
262 | if (x->repl->check(x, skb, seq)) { |
263 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); |
264 | goto drop_unlock; |
265 | } |
266 | |
267 | if (xfrm_state_check_expire(x)) { |
268 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED); |
269 | goto drop_unlock; |
270 | } |
271 | |
272 | spin_unlock(&x->lock); |
273 | |
274 | seq_hi = htonl(xfrm_replay_seqhi(x, seq)); |
275 | |
276 | XFRM_SKB_CB(skb)->seq.input.low = seq; |
277 | XFRM_SKB_CB(skb)->seq.input.hi = seq_hi; |
278 | |
279 | skb_dst_force(skb); |
280 | |
281 | nexthdr = x->type->input(x, skb); |
282 | |
283 | if (nexthdr == -EINPROGRESS) |
284 | return 0; |
285 | resume: |
286 | spin_lock(&x->lock); |
287 | if (nexthdr <= 0) { |
288 | if (nexthdr == -EBADMSG) { |
289 | xfrm_audit_state_icvfail(x, skb, |
290 | x->type->proto); |
291 | x->stats.integrity_failed++; |
292 | } |
293 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); |
294 | goto drop_unlock; |
295 | } |
296 | |
297 | /* only the first xfrm gets the encap type */ |
298 | encap_type = 0; |
299 | |
300 | if (async && x->repl->recheck(x, skb, seq)) { |
301 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); |
302 | goto drop_unlock; |
303 | } |
304 | |
305 | x->repl->advance(x, seq); |
306 | |
307 | x->curlft.bytes += skb->len; |
308 | x->curlft.packets++; |
309 | |
310 | spin_unlock(&x->lock); |
311 | |
312 | XFRM_MODE_SKB_CB(skb)->protocol = nexthdr; |
313 | |
314 | inner_mode = x->inner_mode; |
315 | |
316 | if (x->sel.family == AF_UNSPEC) { |
317 | inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); |
318 | if (inner_mode == NULL) |
319 | goto drop; |
320 | } |
321 | |
322 | if (inner_mode->input(x, skb)) { |
323 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); |
324 | goto drop; |
325 | } |
326 | |
327 | if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) { |
328 | decaps = 1; |
329 | break; |
330 | } |
331 | |
332 | /* |
333 | * We need the inner address. However, we only get here for |
334 | * transport mode so the outer address is identical. |
335 | */ |
336 | daddr = &x->id.daddr; |
337 | family = x->outer_mode->afinfo->family; |
338 | |
339 | err = xfrm_parse_spi(skb, nexthdr, &spi, &seq); |
340 | if (err < 0) { |
341 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
342 | goto drop; |
343 | } |
344 | } while (!err); |
345 | |
346 | err = xfrm_rcv_cb(skb, family, x->type->proto, 0); |
347 | if (err) |
348 | goto drop; |
349 | |
350 | nf_reset(skb); |
351 | |
352 | if (decaps) { |
353 | skb_dst_drop(skb); |
354 | netif_rx(skb); |
355 | return 0; |
356 | } else { |
357 | return x->inner_mode->afinfo->transport_finish(skb, async); |
358 | } |
359 | |
360 | drop_unlock: |
361 | spin_unlock(&x->lock); |
362 | drop: |
363 | xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1); |
364 | kfree_skb(skb); |
365 | return 0; |
366 | } |
367 | EXPORT_SYMBOL(xfrm_input); |
368 | |
369 | int xfrm_input_resume(struct sk_buff *skb, int nexthdr) |
370 | { |
371 | return xfrm_input(skb, nexthdr, 0, -1); |
372 | } |
373 | EXPORT_SYMBOL(xfrm_input_resume); |
374 | |
375 | void __init xfrm_input_init(void) |
376 | { |
377 | secpath_cachep = kmem_cache_create("secpath_cache", |
378 | sizeof(struct sec_path), |
379 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
380 | NULL); |
381 | } |
382 |
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