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Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * xfrm_input.c | |
3 | * | |
4 | * Changes: | |
5 | * YOSHIFUJI Hideaki @USAGI | |
6 | * Split up af-specific portion | |
a716c119 | 7 | * |
1da177e4 LT |
8 | */ |
9 | ||
10 | #include <linux/slab.h> | |
11 | #include <linux/module.h> | |
716062fd HX |
12 | #include <linux/netdevice.h> |
13 | #include <net/dst.h> | |
1da177e4 LT |
14 | #include <net/ip.h> |
15 | #include <net/xfrm.h> | |
049f8e2e AD |
16 | #include <net/ip_tunnels.h> |
17 | #include <net/ip6_tunnel.h> | |
1da177e4 | 18 | |
e18b890b | 19 | static struct kmem_cache *secpath_cachep __read_mostly; |
1da177e4 | 20 | |
2f32b51b | 21 | static DEFINE_SPINLOCK(xfrm_input_afinfo_lock); |
960fdfde | 22 | static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[AF_INET6 + 1]; |
2f32b51b | 23 | |
1995876a SK |
24 | static struct gro_cells gro_cells; |
25 | static struct net_device xfrm_napi_dev; | |
26 | ||
960fdfde | 27 | int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo) |
2f32b51b SK |
28 | { |
29 | int err = 0; | |
30 | ||
960fdfde | 31 | if (WARN_ON(afinfo->family >= ARRAY_SIZE(xfrm_input_afinfo))) |
2f32b51b | 32 | return -EAFNOSUPPORT; |
960fdfde | 33 | |
2f32b51b SK |
34 | spin_lock_bh(&xfrm_input_afinfo_lock); |
35 | if (unlikely(xfrm_input_afinfo[afinfo->family] != NULL)) | |
f31e8d4f | 36 | err = -EEXIST; |
2f32b51b SK |
37 | else |
38 | rcu_assign_pointer(xfrm_input_afinfo[afinfo->family], afinfo); | |
39 | spin_unlock_bh(&xfrm_input_afinfo_lock); | |
40 | return err; | |
41 | } | |
42 | EXPORT_SYMBOL(xfrm_input_register_afinfo); | |
43 | ||
960fdfde | 44 | int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo) |
2f32b51b SK |
45 | { |
46 | int err = 0; | |
47 | ||
2f32b51b SK |
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 | ||
960fdfde | 61 | static const struct xfrm_input_afinfo *xfrm_input_get_afinfo(unsigned int family) |
2f32b51b | 62 | { |
960fdfde | 63 | const struct xfrm_input_afinfo *afinfo; |
2f32b51b | 64 | |
960fdfde | 65 | if (WARN_ON_ONCE(family >= ARRAY_SIZE(xfrm_input_afinfo))) |
2f32b51b | 66 | return NULL; |
960fdfde | 67 | |
2f32b51b SK |
68 | rcu_read_lock(); |
69 | afinfo = rcu_dereference(xfrm_input_afinfo[family]); | |
70 | if (unlikely(!afinfo)) | |
71 | rcu_read_unlock(); | |
72 | return afinfo; | |
73 | } | |
74 | ||
2f32b51b SK |
75 | static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol, |
76 | int err) | |
77 | { | |
78 | int ret; | |
960fdfde | 79 | const struct xfrm_input_afinfo *afinfo = xfrm_input_get_afinfo(family); |
2f32b51b SK |
80 | |
81 | if (!afinfo) | |
82 | return -EAFNOSUPPORT; | |
83 | ||
84 | ret = afinfo->callback(skb, protocol, err); | |
960fdfde | 85 | rcu_read_unlock(); |
2f32b51b SK |
86 | |
87 | return ret; | |
88 | } | |
89 | ||
1da177e4 LT |
90 | void __secpath_destroy(struct sec_path *sp) |
91 | { | |
92 | int i; | |
93 | for (i = 0; i < sp->len; i++) | |
dbe5b4aa | 94 | xfrm_state_put(sp->xvec[i]); |
1da177e4 LT |
95 | kmem_cache_free(secpath_cachep, sp); |
96 | } | |
97 | EXPORT_SYMBOL(__secpath_destroy); | |
98 | ||
99 | struct sec_path *secpath_dup(struct sec_path *src) | |
100 | { | |
101 | struct sec_path *sp; | |
102 | ||
54e6ecb2 | 103 | sp = kmem_cache_alloc(secpath_cachep, GFP_ATOMIC); |
1da177e4 LT |
104 | if (!sp) |
105 | return NULL; | |
106 | ||
107 | sp->len = 0; | |
54ef207a SK |
108 | sp->olen = 0; |
109 | ||
1da177e4 LT |
110 | if (src) { |
111 | int i; | |
112 | ||
113 | memcpy(sp, src, sizeof(*sp)); | |
114 | for (i = 0; i < sp->len; i++) | |
dbe5b4aa | 115 | xfrm_state_hold(sp->xvec[i]); |
1da177e4 LT |
116 | } |
117 | atomic_set(&sp->refcnt, 1); | |
118 | return sp; | |
119 | } | |
120 | EXPORT_SYMBOL(secpath_dup); | |
121 | ||
b0fcee82 SK |
122 | int secpath_set(struct sk_buff *skb) |
123 | { | |
124 | struct sec_path *sp; | |
125 | ||
126 | /* Allocate new secpath or COW existing one. */ | |
127 | if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) { | |
128 | sp = secpath_dup(skb->sp); | |
129 | if (!sp) | |
130 | return -ENOMEM; | |
131 | ||
132 | if (skb->sp) | |
133 | secpath_put(skb->sp); | |
134 | skb->sp = sp; | |
135 | } | |
136 | return 0; | |
137 | } | |
138 | EXPORT_SYMBOL(secpath_set); | |
139 | ||
1da177e4 LT |
140 | /* Fetch spi and seq from ipsec header */ |
141 | ||
6067b2ba | 142 | int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq) |
1da177e4 LT |
143 | { |
144 | int offset, offset_seq; | |
44072500 | 145 | int hlen; |
1da177e4 LT |
146 | |
147 | switch (nexthdr) { | |
148 | case IPPROTO_AH: | |
44072500 | 149 | hlen = sizeof(struct ip_auth_hdr); |
1da177e4 LT |
150 | offset = offsetof(struct ip_auth_hdr, spi); |
151 | offset_seq = offsetof(struct ip_auth_hdr, seq_no); | |
152 | break; | |
153 | case IPPROTO_ESP: | |
44072500 | 154 | hlen = sizeof(struct ip_esp_hdr); |
1da177e4 LT |
155 | offset = offsetof(struct ip_esp_hdr, spi); |
156 | offset_seq = offsetof(struct ip_esp_hdr, seq_no); | |
157 | break; | |
158 | case IPPROTO_COMP: | |
159 | if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr))) | |
160 | return -EINVAL; | |
3e94c2dc | 161 | *spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2))); |
1da177e4 LT |
162 | *seq = 0; |
163 | return 0; | |
164 | default: | |
165 | return 1; | |
166 | } | |
167 | ||
44072500 | 168 | if (!pskb_may_pull(skb, hlen)) |
1da177e4 LT |
169 | return -EINVAL; |
170 | ||
3e94c2dc WC |
171 | *spi = *(__be32 *)(skb_transport_header(skb) + offset); |
172 | *seq = *(__be32 *)(skb_transport_header(skb) + offset_seq); | |
1da177e4 LT |
173 | return 0; |
174 | } | |
1e295370 | 175 | EXPORT_SYMBOL(xfrm_parse_spi); |
1da177e4 | 176 | |
227620e2 HX |
177 | int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb) |
178 | { | |
df9dcb45 | 179 | struct xfrm_mode *inner_mode = x->inner_mode; |
227620e2 HX |
180 | int err; |
181 | ||
182 | err = x->outer_mode->afinfo->extract_input(x, skb); | |
183 | if (err) | |
184 | return err; | |
185 | ||
df9dcb45 KM |
186 | if (x->sel.family == AF_UNSPEC) { |
187 | inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); | |
188 | if (inner_mode == NULL) | |
189 | return -EAFNOSUPPORT; | |
190 | } | |
191 | ||
192 | skb->protocol = inner_mode->afinfo->eth_proto; | |
193 | return inner_mode->input2(x, skb); | |
227620e2 HX |
194 | } |
195 | EXPORT_SYMBOL(xfrm_prepare_input); | |
196 | ||
716062fd HX |
197 | int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) |
198 | { | |
bd235e3c | 199 | struct net *net = dev_net(skb->dev); |
716062fd HX |
200 | int err; |
201 | __be32 seq; | |
2cd08467 | 202 | __be32 seq_hi; |
3328715e | 203 | struct xfrm_state *x = NULL; |
1bf06cd2 | 204 | xfrm_address_t *daddr; |
df9dcb45 | 205 | struct xfrm_mode *inner_mode; |
049f8e2e | 206 | u32 mark = skb->mark; |
2fcb45b6 | 207 | unsigned int family; |
716062fd | 208 | int decaps = 0; |
1bf06cd2 HX |
209 | int async = 0; |
210 | ||
211 | /* A negative encap_type indicates async resumption. */ | |
212 | if (encap_type < 0) { | |
213 | async = 1; | |
00501121 | 214 | x = xfrm_input_state(skb); |
1ce3644a | 215 | seq = XFRM_SKB_CB(skb)->seq.input.low; |
3328715e | 216 | family = x->outer_mode->afinfo->family; |
1bf06cd2 HX |
217 | goto resume; |
218 | } | |
716062fd | 219 | |
3328715e SK |
220 | daddr = (xfrm_address_t *)(skb_network_header(skb) + |
221 | XFRM_SPI_SKB_CB(skb)->daddroff); | |
222 | family = XFRM_SPI_SKB_CB(skb)->family; | |
223 | ||
049f8e2e | 224 | /* if tunnel is present override skb->mark value with tunnel i_key */ |
1625f452 AK |
225 | switch (family) { |
226 | case AF_INET: | |
227 | if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) | |
049f8e2e | 228 | mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key); |
1625f452 AK |
229 | break; |
230 | case AF_INET6: | |
231 | if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) | |
049f8e2e | 232 | mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key); |
1625f452 | 233 | break; |
049f8e2e AD |
234 | } |
235 | ||
b0fcee82 SK |
236 | err = secpath_set(skb); |
237 | if (err) { | |
238 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); | |
239 | goto drop; | |
b2aa5e9d HX |
240 | } |
241 | ||
716062fd | 242 | seq = 0; |
0aa64774 | 243 | if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) { |
59c9940e | 244 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
716062fd | 245 | goto drop; |
0aa64774 | 246 | } |
716062fd HX |
247 | |
248 | do { | |
0aa64774 | 249 | if (skb->sp->len == XFRM_MAX_DEPTH) { |
59c9940e | 250 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
716062fd | 251 | goto drop; |
0aa64774 | 252 | } |
716062fd | 253 | |
049f8e2e | 254 | x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family); |
0aa64774 | 255 | if (x == NULL) { |
59c9940e | 256 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES); |
afeb14b4 | 257 | xfrm_audit_state_notfound(skb, family, spi, seq); |
716062fd | 258 | goto drop; |
0aa64774 | 259 | } |
716062fd | 260 | |
b2aa5e9d HX |
261 | skb->sp->xvec[skb->sp->len++] = x; |
262 | ||
716062fd | 263 | spin_lock(&x->lock); |
4c4d41f2 | 264 | |
0aa64774 | 265 | if (unlikely(x->km.state != XFRM_STATE_VALID)) { |
dc0565ce LR |
266 | if (x->km.state == XFRM_STATE_ACQ) |
267 | XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR); | |
268 | else | |
269 | XFRM_INC_STATS(net, | |
270 | LINUX_MIB_XFRMINSTATEINVALID); | |
716062fd | 271 | goto drop_unlock; |
0aa64774 | 272 | } |
716062fd | 273 | |
3de77cf2 DM |
274 | if ((x->encap ? x->encap->encap_type : 0) != encap_type) { |
275 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); | |
276 | goto drop_unlock; | |
277 | } | |
278 | ||
36ae0148 | 279 | if (x->repl->check(x, skb, seq)) { |
59c9940e | 280 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); |
716062fd | 281 | goto drop_unlock; |
0aa64774 | 282 | } |
716062fd | 283 | |
0aa64774 | 284 | if (xfrm_state_check_expire(x)) { |
59c9940e | 285 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED); |
716062fd | 286 | goto drop_unlock; |
0aa64774 | 287 | } |
716062fd | 288 | |
0ebea8ef HX |
289 | spin_unlock(&x->lock); |
290 | ||
68c11e98 AD |
291 | if (xfrm_tunnel_check(skb, x, family)) { |
292 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); | |
293 | goto drop; | |
294 | } | |
295 | ||
2cd08467 SK |
296 | seq_hi = htonl(xfrm_replay_seqhi(x, seq)); |
297 | ||
1ce3644a | 298 | XFRM_SKB_CB(skb)->seq.input.low = seq; |
2cd08467 | 299 | XFRM_SKB_CB(skb)->seq.input.hi = seq_hi; |
1bf06cd2 | 300 | |
3bc07321 | 301 | skb_dst_force(skb); |
071d36bf | 302 | dev_hold(skb->dev); |
3bc07321 | 303 | |
716062fd | 304 | nexthdr = x->type->input(x, skb); |
0ebea8ef | 305 | |
1bf06cd2 HX |
306 | if (nexthdr == -EINPROGRESS) |
307 | return 0; | |
1bf06cd2 | 308 | resume: |
071d36bf SAK |
309 | dev_put(skb->dev); |
310 | ||
0ebea8ef | 311 | spin_lock(&x->lock); |
668dc8af | 312 | if (nexthdr <= 0) { |
9dd3245a HX |
313 | if (nexthdr == -EBADMSG) { |
314 | xfrm_audit_state_icvfail(x, skb, | |
315 | x->type->proto); | |
668dc8af | 316 | x->stats.integrity_failed++; |
9dd3245a | 317 | } |
59c9940e | 318 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); |
716062fd | 319 | goto drop_unlock; |
668dc8af | 320 | } |
716062fd | 321 | |
716062fd HX |
322 | /* only the first xfrm gets the encap type */ |
323 | encap_type = 0; | |
324 | ||
3b59df46 | 325 | if (async && x->repl->recheck(x, skb, seq)) { |
bcf66bf5 SK |
326 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); |
327 | goto drop_unlock; | |
328 | } | |
329 | ||
9fdc4883 | 330 | x->repl->advance(x, seq); |
716062fd HX |
331 | |
332 | x->curlft.bytes += skb->len; | |
333 | x->curlft.packets++; | |
334 | ||
335 | spin_unlock(&x->lock); | |
336 | ||
60d5fcfb HX |
337 | XFRM_MODE_SKB_CB(skb)->protocol = nexthdr; |
338 | ||
df9dcb45 KM |
339 | inner_mode = x->inner_mode; |
340 | ||
341 | if (x->sel.family == AF_UNSPEC) { | |
342 | inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); | |
cb866e32 SK |
343 | if (inner_mode == NULL) { |
344 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); | |
df9dcb45 | 345 | goto drop; |
cb866e32 | 346 | } |
df9dcb45 KM |
347 | } |
348 | ||
349 | if (inner_mode->input(x, skb)) { | |
59c9940e | 350 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); |
716062fd | 351 | goto drop; |
0aa64774 | 352 | } |
716062fd HX |
353 | |
354 | if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) { | |
355 | decaps = 1; | |
356 | break; | |
357 | } | |
358 | ||
1bf06cd2 HX |
359 | /* |
360 | * We need the inner address. However, we only get here for | |
361 | * transport mode so the outer address is identical. | |
362 | */ | |
363 | daddr = &x->id.daddr; | |
2fcb45b6 | 364 | family = x->outer_mode->afinfo->family; |
1bf06cd2 | 365 | |
716062fd | 366 | err = xfrm_parse_spi(skb, nexthdr, &spi, &seq); |
0aa64774 | 367 | if (err < 0) { |
59c9940e | 368 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
716062fd | 369 | goto drop; |
0aa64774 | 370 | } |
716062fd HX |
371 | } while (!err); |
372 | ||
3328715e SK |
373 | err = xfrm_rcv_cb(skb, family, x->type->proto, 0); |
374 | if (err) | |
375 | goto drop; | |
376 | ||
716062fd HX |
377 | nf_reset(skb); |
378 | ||
379 | if (decaps) { | |
adf30907 | 380 | skb_dst_drop(skb); |
1995876a | 381 | gro_cells_receive(&gro_cells, skb); |
716062fd HX |
382 | return 0; |
383 | } else { | |
1bf06cd2 | 384 | return x->inner_mode->afinfo->transport_finish(skb, async); |
716062fd HX |
385 | } |
386 | ||
387 | drop_unlock: | |
388 | spin_unlock(&x->lock); | |
716062fd | 389 | drop: |
3328715e | 390 | xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1); |
716062fd HX |
391 | kfree_skb(skb); |
392 | return 0; | |
393 | } | |
394 | EXPORT_SYMBOL(xfrm_input); | |
395 | ||
1bf06cd2 HX |
396 | int xfrm_input_resume(struct sk_buff *skb, int nexthdr) |
397 | { | |
398 | return xfrm_input(skb, nexthdr, 0, -1); | |
399 | } | |
400 | EXPORT_SYMBOL(xfrm_input_resume); | |
401 | ||
1da177e4 LT |
402 | void __init xfrm_input_init(void) |
403 | { | |
1995876a SK |
404 | int err; |
405 | ||
406 | init_dummy_netdev(&xfrm_napi_dev); | |
407 | err = gro_cells_init(&gro_cells, &xfrm_napi_dev); | |
408 | if (err) | |
409 | gro_cells.cells = NULL; | |
410 | ||
1da177e4 LT |
411 | secpath_cachep = kmem_cache_create("secpath_cache", |
412 | sizeof(struct sec_path), | |
e5d679f3 | 413 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 414 | NULL); |
1da177e4 | 415 | } |