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lg-vl600: Convert uses of __constant_<foo> to <foo>
[linux-2.6-block.git] / net / xfrm / xfrm_policy.c
CommitLineData
a716c119 1/*
1da177e4
LT		 2 * xfrm_policy.c
3 *
4 * Changes:
5 * Mitsuru KANDA @USAGI
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
8 * IPv6 support
9 * Kazunori MIYAZAWA @USAGI
10 * YOSHIFUJI Hideaki
11 * Split up af-specific portion
12 * Derek Atkins <derek@ihtfp.com> Add the post_input processor
df71837d 13 *
1da177e4
LT		 14 */
15
66cdb3ca 16#include <linux/err.h>
1da177e4
LT		 17#include <linux/slab.h>
18#include <linux/kmod.h>
19#include <linux/list.h>
20#include <linux/spinlock.h>
21#include <linux/workqueue.h>
22#include <linux/notifier.h>
23#include <linux/netdevice.h>
eb9c7ebe 24#include <linux/netfilter.h>
1da177e4 25#include <linux/module.h>
2518c7c2 26#include <linux/cache.h>
68277acc 27#include <linux/audit.h>
25ee3286 28#include <net/dst.h>
6ce74ec7 29#include <net/flow.h>
1da177e4
LT		 30#include <net/xfrm.h>
31#include <net/ip.h>
558f82ef
MN		 32#ifdef CONFIG_XFRM_STATISTICS
33#include <net/snmp.h>
34#endif
1da177e4 35
44e36b42
DM		 36#include "xfrm_hash.h"
37
a0073fe1
SK		 38#define XFRM_QUEUE_TMO_MIN ((unsigned)(HZ/10))
39#define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ))
40#define XFRM_MAX_QUEUE_LEN 100
41
418a99ac
PJ		 42static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock);
43static struct xfrm_policy_afinfo __rcu *xfrm_policy_afinfo[NPROTO]
44 __read_mostly;
1da177e4 45
e18b890b 46static struct kmem_cache *xfrm_dst_cache __read_mostly;
1da177e4 47
25ee3286 48static void xfrm_init_pmtu(struct dst_entry *dst);
80c802f3 49static int stale_bundle(struct dst_entry *dst);
12fdb4d3 50static int xfrm_bundle_ok(struct xfrm_dst *xdst);
a0073fe1 51static void xfrm_policy_queue_process(unsigned long arg);
1da177e4 52
29fa0b30
WY		 53static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
54 int dir);
55
bc9b35ad 56static inline bool
200ce96e 57__xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
77681021 58{
7e1dc7b6
DM		 59 const struct flowi4 *fl4 = &fl->u.ip4;
60
26bff940
AD		 61 return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) &&
62 addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) &&
7e1dc7b6
DM		 63 !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) &&
64 !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) &&
65 (fl4->flowi4_proto == sel->proto || !sel->proto) &&
66 (fl4->flowi4_oif == sel->ifindex || !sel->ifindex);
77681021
AM		 67}
68
bc9b35ad 69static inline bool
200ce96e 70__xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
77681021 71{
7e1dc7b6
DM		 72 const struct flowi6 *fl6 = &fl->u.ip6;
73
74 return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) &&
75 addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) &&
76 !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) &&
77 !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) &&
78 (fl6->flowi6_proto == sel->proto || !sel->proto) &&
79 (fl6->flowi6_oif == sel->ifindex || !sel->ifindex);
77681021
AM		 80}
81
bc9b35ad
DM		 82bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl,
83 unsigned short family)
77681021
AM		 84{
85 switch (family) {
86 case AF_INET:
87 return __xfrm4_selector_match(sel, fl);
88 case AF_INET6:
89 return __xfrm6_selector_match(sel, fl);
90 }
bc9b35ad 91 return false;
77681021
AM		 92}
93
ef8531b6
ED		 94static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
95{
96 struct xfrm_policy_afinfo *afinfo;
97
98 if (unlikely(family >= NPROTO))
99 return NULL;
100 rcu_read_lock();
101 afinfo = rcu_dereference(xfrm_policy_afinfo[family]);
102 if (unlikely(!afinfo))
103 rcu_read_unlock();
104 return afinfo;
105}
106
107static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
108{
109 rcu_read_unlock();
110}
111
c5b3cf46 112static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos,
6418c4e0
DM		 113 const xfrm_address_t *saddr,
114 const xfrm_address_t *daddr,
9bb182a7
YH		 115 int family)
116{
117 struct xfrm_policy_afinfo *afinfo;
118 struct dst_entry *dst;
119
120 afinfo = xfrm_policy_get_afinfo(family);
121 if (unlikely(afinfo == NULL))
122 return ERR_PTR(-EAFNOSUPPORT);
123
c5b3cf46 124 dst = afinfo->dst_lookup(net, tos, saddr, daddr);
9bb182a7
YH		 125
126 xfrm_policy_put_afinfo(afinfo);
127
128 return dst;
129}
130
25ee3286 131static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos,
9bb182a7
YH		 132 xfrm_address_t *prev_saddr,
133 xfrm_address_t *prev_daddr,
25ee3286 134 int family)
1da177e4 135{
c5b3cf46 136 struct net *net = xs_net(x);
66cdb3ca
HX		 137 xfrm_address_t *saddr = &x->props.saddr;
138 xfrm_address_t *daddr = &x->id.daddr;
66cdb3ca
HX		 139 struct dst_entry *dst;
140
9bb182a7 141 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
66cdb3ca 142 saddr = x->coaddr;
9bb182a7
YH		 143 daddr = prev_daddr;
144 }
145 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
146 saddr = prev_saddr;
66cdb3ca 147 daddr = x->coaddr;
9bb182a7 148 }
1da177e4 149
c5b3cf46 150 dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family);
9bb182a7
YH		 151
152 if (!IS_ERR(dst)) {
153 if (prev_saddr != saddr)
154 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
155 if (prev_daddr != daddr)
156 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
157 }
1da177e4 158
66cdb3ca 159 return dst;
1da177e4 160}
1da177e4 161
1da177e4
LT		 162static inline unsigned long make_jiffies(long secs)
163{
164 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
165 return MAX_SCHEDULE_TIMEOUT-1;
166 else
a716c119 167 return secs*HZ;
1da177e4
LT		 168}
169
170static void xfrm_policy_timer(unsigned long data)
171{
3e94c2dc 172 struct xfrm_policy *xp = (struct xfrm_policy *)data;
9d729f72 173 unsigned long now = get_seconds();
1da177e4
LT		 174 long next = LONG_MAX;
175 int warn = 0;
176 int dir;
177
178 read_lock(&xp->lock);
179
ea2dea9d 180 if (unlikely(xp->walk.dead))
1da177e4
LT		 181 goto out;
182
77d8d7a6 183 dir = xfrm_policy_id2dir(xp->index);
1da177e4
LT		 184
185 if (xp->lft.hard_add_expires_seconds) {
186 long tmo = xp->lft.hard_add_expires_seconds +
187 xp->curlft.add_time - now;
188 if (tmo <= 0)
189 goto expired;
190 if (tmo < next)
191 next = tmo;
192 }
193 if (xp->lft.hard_use_expires_seconds) {
194 long tmo = xp->lft.hard_use_expires_seconds +
195 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
196 if (tmo <= 0)
197 goto expired;
198 if (tmo < next)
199 next = tmo;
200 }
201 if (xp->lft.soft_add_expires_seconds) {
202 long tmo = xp->lft.soft_add_expires_seconds +
203 xp->curlft.add_time - now;
204 if (tmo <= 0) {
205 warn = 1;
206 tmo = XFRM_KM_TIMEOUT;
207 }
208 if (tmo < next)
209 next = tmo;
210 }
211 if (xp->lft.soft_use_expires_seconds) {
212 long tmo = xp->lft.soft_use_expires_seconds +
213 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
214 if (tmo <= 0) {
215 warn = 1;
216 tmo = XFRM_KM_TIMEOUT;
217 }
218 if (tmo < next)
219 next = tmo;
220 }
221
222 if (warn)
6c5c8ca7 223 km_policy_expired(xp, dir, 0, 0);
1da177e4
LT		 224 if (next != LONG_MAX &&
225 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
226 xfrm_pol_hold(xp);
227
228out:
229 read_unlock(&xp->lock);
230 xfrm_pol_put(xp);
231 return;
232
233expired:
234 read_unlock(&xp->lock);
4666faab 235 if (!xfrm_policy_delete(xp, dir))
6c5c8ca7 236 km_policy_expired(xp, dir, 1, 0);
1da177e4
LT		 237 xfrm_pol_put(xp);
238}
239
fe1a5f03
TT		 240static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
241{
242 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
243
244 if (unlikely(pol->walk.dead))
245 flo = NULL;
246 else
247 xfrm_pol_hold(pol);
248
249 return flo;
250}
251
252static int xfrm_policy_flo_check(struct flow_cache_object *flo)
253{
254 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
255
256 return !pol->walk.dead;
257}
258
259static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
260{
261 xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
262}
263
264static const struct flow_cache_ops xfrm_policy_fc_ops = {
265 .get = xfrm_policy_flo_get,
266 .check = xfrm_policy_flo_check,
267 .delete = xfrm_policy_flo_delete,
268};
1da177e4
LT		 269
270/* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
271 * SPD calls.
272 */
273
0331b1f3 274struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
1da177e4
LT		 275{
276 struct xfrm_policy *policy;
277
0da974f4 278 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
1da177e4
LT		 279
280 if (policy) {
0331b1f3 281 write_pnet(&policy->xp_net, net);
12a169e7 282 INIT_LIST_HEAD(&policy->walk.all);
2518c7c2
DM		 283 INIT_HLIST_NODE(&policy->bydst);
284 INIT_HLIST_NODE(&policy->byidx);
1da177e4 285 rwlock_init(&policy->lock);
2518c7c2 286 atomic_set(&policy->refcnt, 1);
a0073fe1 287 skb_queue_head_init(&policy->polq.hold_queue);
b24b8a24
PE		 288 setup_timer(&policy->timer, xfrm_policy_timer,
289 (unsigned long)policy);
a0073fe1
SK		 290 setup_timer(&policy->polq.hold_timer, xfrm_policy_queue_process,
291 (unsigned long)policy);
fe1a5f03 292 policy->flo.ops = &xfrm_policy_fc_ops;
1da177e4
LT		 293 }
294 return policy;
295}
296EXPORT_SYMBOL(xfrm_policy_alloc);
297
298/* Destroy xfrm_policy: descendant resources must be released to this moment. */
299
64c31b3f 300void xfrm_policy_destroy(struct xfrm_policy *policy)
1da177e4 301{
12a169e7 302 BUG_ON(!policy->walk.dead);
1da177e4 303
0659eea9 304 if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer))
1da177e4
LT		 305 BUG();
306
03e1ad7b 307 security_xfrm_policy_free(policy->security);
1da177e4
LT		 308 kfree(policy);
309}
64c31b3f 310EXPORT_SYMBOL(xfrm_policy_destroy);
1da177e4 311
a0073fe1
SK		 312static void xfrm_queue_purge(struct sk_buff_head *list)
313{
314 struct sk_buff *skb;
315
302a50bc 316 while ((skb = skb_dequeue(list)) != NULL)
a0073fe1 317 kfree_skb(skb);
a0073fe1
SK		 318}
319
1da177e4
LT		 320/* Rule must be locked. Release descentant resources, announce
321 * entry dead. The rule must be unlinked from lists to the moment.
322 */
323
324static void xfrm_policy_kill(struct xfrm_policy *policy)
325{
12a169e7 326 policy->walk.dead = 1;
1da177e4 327
285ead17 328 atomic_inc(&policy->genid);
1da177e4 329
e7d8f6cb
SK		 330 if (del_timer(&policy->polq.hold_timer))
331 xfrm_pol_put(policy);
a0073fe1
SK		 332 xfrm_queue_purge(&policy->polq.hold_queue);
333
285ead17
TT		 334 if (del_timer(&policy->timer))
335 xfrm_pol_put(policy);
336
337 xfrm_pol_put(policy);
1da177e4
LT		 338}
339
2518c7c2
DM		 340static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
341
e92303f8 342static inline unsigned int idx_hash(struct net *net, u32 index)
2518c7c2 343{
e92303f8 344 return __idx_hash(index, net->xfrm.policy_idx_hmask);
2518c7c2
DM		 345}
346
5f803b58
DM		 347static struct hlist_head *policy_hash_bysel(struct net *net,
348 const struct xfrm_selector *sel,
349 unsigned short family, int dir)
2518c7c2 350{
1121994c 351 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
2518c7c2
DM		 352 unsigned int hash = __sel_hash(sel, family, hmask);
353
354 return (hash == hmask + 1 ?
1121994c
AD		 355 &net->xfrm.policy_inexact[dir] :
356 net->xfrm.policy_bydst[dir].table + hash);
2518c7c2
DM		 357}
358
5f803b58
DM		 359static struct hlist_head *policy_hash_direct(struct net *net,
360 const xfrm_address_t *daddr,
361 const xfrm_address_t *saddr,
362 unsigned short family, int dir)
2518c7c2 363{
1121994c 364 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
2518c7c2
DM		 365 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
366
1121994c 367 return net->xfrm.policy_bydst[dir].table + hash;
2518c7c2
DM		 368}
369
2518c7c2
DM		 370static void xfrm_dst_hash_transfer(struct hlist_head *list,
371 struct hlist_head *ndsttable,
372 unsigned int nhashmask)
373{
b67bfe0d 374 struct hlist_node *tmp, *entry0 = NULL;
2518c7c2 375 struct xfrm_policy *pol;
b791160b 376 unsigned int h0 = 0;
2518c7c2 377
b791160b 378redo:
b67bfe0d 379 hlist_for_each_entry_safe(pol, tmp, list, bydst) {
2518c7c2
DM		 380 unsigned int h;
381
382 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
383 pol->family, nhashmask);
b791160b 384 if (!entry0) {
b67bfe0d 385 hlist_del(&pol->bydst);
b791160b
YH		 386 hlist_add_head(&pol->bydst, ndsttable+h);
387 h0 = h;
388 } else {
389 if (h != h0)
390 continue;
b67bfe0d 391 hlist_del(&pol->bydst);
b791160b
YH		 392 hlist_add_after(entry0, &pol->bydst);
393 }
b67bfe0d 394 entry0 = &pol->bydst;
b791160b
YH		 395 }
396 if (!hlist_empty(list)) {
397 entry0 = NULL;
398 goto redo;
2518c7c2
DM		 399 }
400}
401
402static void xfrm_idx_hash_transfer(struct hlist_head *list,
403 struct hlist_head *nidxtable,
404 unsigned int nhashmask)
405{
b67bfe0d 406 struct hlist_node *tmp;
2518c7c2
DM		 407 struct xfrm_policy *pol;
408
b67bfe0d 409 hlist_for_each_entry_safe(pol, tmp, list, byidx) {
2518c7c2
DM		 410 unsigned int h;
411
412 h = __idx_hash(pol->index, nhashmask);
413 hlist_add_head(&pol->byidx, nidxtable+h);
414 }
415}
416
417static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
418{
419 return ((old_hmask + 1) << 1) - 1;
420}
421
66caf628 422static void xfrm_bydst_resize(struct net *net, int dir)
2518c7c2 423{
66caf628 424 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
2518c7c2
DM		 425 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
426 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
66caf628 427 struct hlist_head *odst = net->xfrm.policy_bydst[dir].table;
44e36b42 428 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
2518c7c2
DM		 429 int i;
430
431 if (!ndst)
432 return;
433
283bc9f3 434 write_lock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2
DM		 435
436 for (i = hmask; i >= 0; i--)
437 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
438
66caf628
AD		 439 net->xfrm.policy_bydst[dir].table = ndst;
440 net->xfrm.policy_bydst[dir].hmask = nhashmask;
2518c7c2 441
283bc9f3 442 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2 443
44e36b42 444 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
2518c7c2
DM		 445}
446
66caf628 447static void xfrm_byidx_resize(struct net *net, int total)
2518c7c2 448{
66caf628 449 unsigned int hmask = net->xfrm.policy_idx_hmask;
2518c7c2
DM		 450 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
451 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
66caf628 452 struct hlist_head *oidx = net->xfrm.policy_byidx;
44e36b42 453 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
2518c7c2
DM		 454 int i;
455
456 if (!nidx)
457 return;
458
283bc9f3 459 write_lock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2
DM		 460
461 for (i = hmask; i >= 0; i--)
462 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
463
66caf628
AD		 464 net->xfrm.policy_byidx = nidx;
465 net->xfrm.policy_idx_hmask = nhashmask;
2518c7c2 466
283bc9f3 467 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2 468
44e36b42 469 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
2518c7c2
DM		 470}
471
66caf628 472static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
2518c7c2 473{
66caf628
AD		 474 unsigned int cnt = net->xfrm.policy_count[dir];
475 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
2518c7c2
DM		 476
477 if (total)
478 *total += cnt;
479
480 if ((hmask + 1) < xfrm_policy_hashmax &&
481 cnt > hmask)
482 return 1;
483
484 return 0;
485}
486
66caf628 487static inline int xfrm_byidx_should_resize(struct net *net, int total)
2518c7c2 488{
66caf628 489 unsigned int hmask = net->xfrm.policy_idx_hmask;
2518c7c2
DM		 490
491 if ((hmask + 1) < xfrm_policy_hashmax &&
492 total > hmask)
493 return 1;
494
495 return 0;
496}
497
e071041b 498void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
ecfd6b18 499{
283bc9f3 500 read_lock_bh(&net->xfrm.xfrm_policy_lock);
e071041b
AD		 501 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
502 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
503 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
504 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
505 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
506 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
507 si->spdhcnt = net->xfrm.policy_idx_hmask;
ecfd6b18 508 si->spdhmcnt = xfrm_policy_hashmax;
283bc9f3 509 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
ecfd6b18
JHS		 510}
511EXPORT_SYMBOL(xfrm_spd_getinfo);
2518c7c2 512
ecfd6b18 513static DEFINE_MUTEX(hash_resize_mutex);
66caf628 514static void xfrm_hash_resize(struct work_struct *work)
2518c7c2 515{
66caf628 516 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
2518c7c2
DM		 517 int dir, total;
518
519 mutex_lock(&hash_resize_mutex);
520
521 total = 0;
522 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
66caf628
AD		 523 if (xfrm_bydst_should_resize(net, dir, &total))
524 xfrm_bydst_resize(net, dir);
2518c7c2 525 }
66caf628
AD		 526 if (xfrm_byidx_should_resize(net, total))
527 xfrm_byidx_resize(net, total);
2518c7c2
DM		 528
529 mutex_unlock(&hash_resize_mutex);
530}
531
1da177e4
LT		 532/* Generate new index... KAME seems to generate them ordered by cost
533 * of an absolute inpredictability of ordering of rules. This will not pass. */
e682adf0 534static u32 xfrm_gen_index(struct net *net, int dir, u32 index)
1da177e4 535{
1da177e4
LT		 536 static u32 idx_generator;
537
538 for (;;) {
2518c7c2
DM		 539 struct hlist_head *list;
540 struct xfrm_policy *p;
541 u32 idx;
542 int found;
543
e682adf0
FD		 544 if (!index) {
545 idx = (idx_generator | dir);
546 idx_generator += 8;
547 } else {
548 idx = index;
549 index = 0;
550 }
551
1da177e4
LT		 552 if (idx == 0)
553 idx = 8;
1121994c 554 list = net->xfrm.policy_byidx + idx_hash(net, idx);
2518c7c2 555 found = 0;
b67bfe0d 556 hlist_for_each_entry(p, list, byidx) {
2518c7c2
DM		 557 if (p->index == idx) {
558 found = 1;
1da177e4 559 break;
2518c7c2 560 }
1da177e4 561 }
2518c7c2 562 if (!found)
1da177e4
LT		 563 return idx;
564 }
565}
566
2518c7c2
DM		 567static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
568{
569 u32 *p1 = (u32 *) s1;
570 u32 *p2 = (u32 *) s2;
571 int len = sizeof(struct xfrm_selector) / sizeof(u32);
572 int i;
573
574 for (i = 0; i < len; i++) {
575 if (p1[i] != p2[i])
576 return 1;
577 }
578
579 return 0;
580}
581
a0073fe1
SK		 582static void xfrm_policy_requeue(struct xfrm_policy *old,
583 struct xfrm_policy *new)
584{
585 struct xfrm_policy_queue *pq = &old->polq;
586 struct sk_buff_head list;
587
588 __skb_queue_head_init(&list);
589
590 spin_lock_bh(&pq->hold_queue.lock);
591 skb_queue_splice_init(&pq->hold_queue, &list);
e7d8f6cb
SK		 592 if (del_timer(&pq->hold_timer))
593 xfrm_pol_put(old);
a0073fe1
SK		 594 spin_unlock_bh(&pq->hold_queue.lock);
595
596 if (skb_queue_empty(&list))
597 return;
598
599 pq = &new->polq;
600
601 spin_lock_bh(&pq->hold_queue.lock);
602 skb_queue_splice(&list, &pq->hold_queue);
603 pq->timeout = XFRM_QUEUE_TMO_MIN;
e7d8f6cb
SK		 604 if (!mod_timer(&pq->hold_timer, jiffies))
605 xfrm_pol_hold(new);
a0073fe1
SK		 606 spin_unlock_bh(&pq->hold_queue.lock);
607}
608
7cb8a939
SK		 609static bool xfrm_policy_mark_match(struct xfrm_policy *policy,
610 struct xfrm_policy *pol)
611{
612 u32 mark = policy->mark.v & policy->mark.m;
613
614 if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m)
615 return true;
616
617 if ((mark & pol->mark.m) == pol->mark.v &&
618 policy->priority == pol->priority)
619 return true;
620
621 return false;
622}
623
1da177e4
LT		 624int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
625{
1121994c 626 struct net *net = xp_net(policy);
2518c7c2
DM		 627 struct xfrm_policy *pol;
628 struct xfrm_policy *delpol;
629 struct hlist_head *chain;
b67bfe0d 630 struct hlist_node *newpos;
1da177e4 631
283bc9f3 632 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1121994c 633 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
2518c7c2
DM		 634 delpol = NULL;
635 newpos = NULL;
b67bfe0d 636 hlist_for_each_entry(pol, chain, bydst) {
a6c7ab55 637 if (pol->type == policy->type &&
2518c7c2 638 !selector_cmp(&pol->selector, &policy->selector) &&
7cb8a939 639 xfrm_policy_mark_match(policy, pol) &&
a6c7ab55
HX		 640 xfrm_sec_ctx_match(pol->security, policy->security) &&
641 !WARN_ON(delpol)) {
1da177e4 642 if (excl) {
283bc9f3 643 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 644 return -EEXIST;
645 }
1da177e4
LT		 646 delpol = pol;
647 if (policy->priority > pol->priority)
648 continue;
649 } else if (policy->priority >= pol->priority) {
a6c7ab55 650 newpos = &pol->bydst;
1da177e4
LT		 651 continue;
652 }
1da177e4
LT		 653 if (delpol)
654 break;
1da177e4
LT		 655 }
656 if (newpos)
2518c7c2
DM		 657 hlist_add_after(newpos, &policy->bydst);
658 else
659 hlist_add_head(&policy->bydst, chain);
1da177e4 660 xfrm_pol_hold(policy);
1121994c 661 net->xfrm.policy_count[dir]++;
ca925cf1 662 atomic_inc(&net->xfrm.flow_cache_genid);
ca4c3fc2 663
664 /* After previous checking, family can either be AF_INET or AF_INET6 */
665 if (policy->family == AF_INET)
666 rt_genid_bump_ipv4(net);
667 else
668 rt_genid_bump_ipv6(net);
669
a0073fe1
SK		 670 if (delpol) {
671 xfrm_policy_requeue(delpol, policy);
29fa0b30 672 __xfrm_policy_unlink(delpol, dir);
a0073fe1 673 }
e682adf0 674 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index);
1121994c 675 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
9d729f72 676 policy->curlft.add_time = get_seconds();
1da177e4
LT		 677 policy->curlft.use_time = 0;
678 if (!mod_timer(&policy->timer, jiffies + HZ))
679 xfrm_pol_hold(policy);
1121994c 680 list_add(&policy->walk.all, &net->xfrm.policy_all);
283bc9f3 681 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 682
9b78a82c 683 if (delpol)
1da177e4 684 xfrm_policy_kill(delpol);
1121994c
AD		 685 else if (xfrm_bydst_should_resize(net, dir, NULL))
686 schedule_work(&net->xfrm.policy_hash_work);
9b78a82c 687
1da177e4
LT		 688 return 0;
689}
690EXPORT_SYMBOL(xfrm_policy_insert);
691
8ca2e93b
JHS		 692struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
693 int dir, struct xfrm_selector *sel,
ef41aaa0
EP		 694 struct xfrm_sec_ctx *ctx, int delete,
695 int *err)
1da177e4 696{
2518c7c2
DM		 697 struct xfrm_policy *pol, *ret;
698 struct hlist_head *chain;
1da177e4 699
ef41aaa0 700 *err = 0;
283bc9f3 701 write_lock_bh(&net->xfrm.xfrm_policy_lock);
8d1211a6 702 chain = policy_hash_bysel(net, sel, sel->family, dir);
2518c7c2 703 ret = NULL;
b67bfe0d 704 hlist_for_each_entry(pol, chain, bydst) {
2518c7c2 705 if (pol->type == type &&
34f8d884 706 (mark & pol->mark.m) == pol->mark.v &&
2518c7c2
DM		 707 !selector_cmp(sel, &pol->selector) &&
708 xfrm_sec_ctx_match(ctx, pol->security)) {
1da177e4 709 xfrm_pol_hold(pol);
2518c7c2 710 if (delete) {
03e1ad7b
PM		 711 *err = security_xfrm_policy_delete(
712 pol->security);
ef41aaa0 713 if (*err) {
283bc9f3 714 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
ef41aaa0
EP		 715 return pol;
716 }
29fa0b30 717 __xfrm_policy_unlink(pol, dir);
2518c7c2
DM		 718 }
719 ret = pol;
1da177e4
LT		 720 break;
721 }
722 }
283bc9f3 723 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 724
fe1a5f03 725 if (ret && delete)
2518c7c2 726 xfrm_policy_kill(ret);
2518c7c2 727 return ret;
1da177e4 728}
df71837d 729EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
1da177e4 730
8ca2e93b
JHS		 731struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
732 int dir, u32 id, int delete, int *err)
1da177e4 733{
2518c7c2
DM		 734 struct xfrm_policy *pol, *ret;
735 struct hlist_head *chain;
1da177e4 736
b5505c6e
HX		 737 *err = -ENOENT;
738 if (xfrm_policy_id2dir(id) != dir)
739 return NULL;
740
ef41aaa0 741 *err = 0;
283bc9f3 742 write_lock_bh(&net->xfrm.xfrm_policy_lock);
8d1211a6 743 chain = net->xfrm.policy_byidx + idx_hash(net, id);
2518c7c2 744 ret = NULL;
b67bfe0d 745 hlist_for_each_entry(pol, chain, byidx) {
34f8d884
JHS		 746 if (pol->type == type && pol->index == id &&
747 (mark & pol->mark.m) == pol->mark.v) {
1da177e4 748 xfrm_pol_hold(pol);
2518c7c2 749 if (delete) {
03e1ad7b
PM		 750 *err = security_xfrm_policy_delete(
751 pol->security);
ef41aaa0 752 if (*err) {
283bc9f3 753 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
ef41aaa0
EP		 754 return pol;
755 }
29fa0b30 756 __xfrm_policy_unlink(pol, dir);
2518c7c2
DM		 757 }
758 ret = pol;
1da177e4
LT		 759 break;
760 }
761 }
283bc9f3 762 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 763
fe1a5f03 764 if (ret && delete)
2518c7c2 765 xfrm_policy_kill(ret);
2518c7c2 766 return ret;
1da177e4
LT		 767}
768EXPORT_SYMBOL(xfrm_policy_byid);
769
4aa2e62c
JL		 770#ifdef CONFIG_SECURITY_NETWORK_XFRM
771static inline int
33ffbbd5 772xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
1da177e4 773{
4aa2e62c
JL		 774 int dir, err = 0;
775
776 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
777 struct xfrm_policy *pol;
4aa2e62c
JL		 778 int i;
779
b67bfe0d 780 hlist_for_each_entry(pol,
33ffbbd5 781 &net->xfrm.policy_inexact[dir], bydst) {
4aa2e62c
JL		 782 if (pol->type != type)
783 continue;
03e1ad7b 784 err = security_xfrm_policy_delete(pol->security);
4aa2e62c 785 if (err) {
ab5f5e8b
JL		 786 xfrm_audit_policy_delete(pol, 0,
787 audit_info->loginuid,
2532386f 788 audit_info->sessionid,
ab5f5e8b 789 audit_info->secid);
4aa2e62c
JL		 790 return err;
791 }
7dc12d6d 792 }
33ffbbd5 793 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
b67bfe0d 794 hlist_for_each_entry(pol,
33ffbbd5 795 net->xfrm.policy_bydst[dir].table + i,
4aa2e62c
JL		 796 bydst) {
797 if (pol->type != type)
798 continue;
03e1ad7b
PM		 799 err = security_xfrm_policy_delete(
800 pol->security);
4aa2e62c 801 if (err) {
ab5f5e8b
JL		 802 xfrm_audit_policy_delete(pol, 0,
803 audit_info->loginuid,
2532386f 804 audit_info->sessionid,
ab5f5e8b 805 audit_info->secid);
4aa2e62c
JL		 806 return err;
807 }
808 }
809 }
810 }
811 return err;
812}
813#else
814static inline int
33ffbbd5 815xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
4aa2e62c
JL		 816{
817 return 0;
818}
819#endif
820
33ffbbd5 821int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info)
4aa2e62c 822{
2f1eb65f 823 int dir, err = 0, cnt = 0;
1da177e4 824
283bc9f3 825 write_lock_bh(&net->xfrm.xfrm_policy_lock);
4aa2e62c 826
33ffbbd5 827 err = xfrm_policy_flush_secctx_check(net, type, audit_info);
4aa2e62c
JL		 828 if (err)
829 goto out;
830
1da177e4 831 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
2518c7c2 832 struct xfrm_policy *pol;
29fa0b30 833 int i;
2518c7c2
DM		 834
835 again1:
b67bfe0d 836 hlist_for_each_entry(pol,
33ffbbd5 837 &net->xfrm.policy_inexact[dir], bydst) {
2518c7c2
DM		 838 if (pol->type != type)
839 continue;
ea2dea9d 840 __xfrm_policy_unlink(pol, dir);
283bc9f3 841 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
ea2dea9d 842 cnt++;
1da177e4 843
ab5f5e8b 844 xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
2532386f 845 audit_info->sessionid,
ab5f5e8b 846 audit_info->secid);
161a09e7 847
2518c7c2 848 xfrm_policy_kill(pol);
1da177e4 849
283bc9f3 850 write_lock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2
DM		 851 goto again1;
852 }
853
33ffbbd5 854 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
2518c7c2 855 again2:
b67bfe0d 856 hlist_for_each_entry(pol,
33ffbbd5 857 net->xfrm.policy_bydst[dir].table + i,
2518c7c2
DM		 858 bydst) {
859 if (pol->type != type)
860 continue;
ea2dea9d 861 __xfrm_policy_unlink(pol, dir);
283bc9f3 862 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
ea2dea9d 863 cnt++;
2518c7c2 864
ab5f5e8b
JL		 865 xfrm_audit_policy_delete(pol, 1,
866 audit_info->loginuid,
2532386f 867 audit_info->sessionid,
ab5f5e8b 868 audit_info->secid);
2518c7c2
DM		 869 xfrm_policy_kill(pol);
870
283bc9f3 871 write_lock_bh(&net->xfrm.xfrm_policy_lock);
2518c7c2
DM		 872 goto again2;
873 }
1da177e4 874 }
2518c7c2 875
1da177e4 876 }
2f1eb65f
JHS		 877 if (!cnt)
878 err = -ESRCH;
4aa2e62c 879out:
283bc9f3 880 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
4aa2e62c 881 return err;
1da177e4
LT		 882}
883EXPORT_SYMBOL(xfrm_policy_flush);
884
cdcbca7c 885int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
4c563f76 886 int (*func)(struct xfrm_policy *, int, int, void*),
1da177e4
LT		 887 void *data)
888{
12a169e7
HX		 889 struct xfrm_policy *pol;
890 struct xfrm_policy_walk_entry *x;
4c563f76
TT		 891 int error = 0;
892
893 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
894 walk->type != XFRM_POLICY_TYPE_ANY)
895 return -EINVAL;
1da177e4 896
12a169e7 897 if (list_empty(&walk->walk.all) && walk->seq != 0)
4c563f76
TT		 898 return 0;
899
283bc9f3 900 write_lock_bh(&net->xfrm.xfrm_policy_lock);
12a169e7 901 if (list_empty(&walk->walk.all))
cdcbca7c 902 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
12a169e7
HX		 903 else
904 x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all);
cdcbca7c 905 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
12a169e7 906 if (x->dead)
4c563f76 907 continue;
12a169e7
HX		 908 pol = container_of(x, struct xfrm_policy, walk);
909 if (walk->type != XFRM_POLICY_TYPE_ANY &&
910 walk->type != pol->type)
911 continue;
912 error = func(pol, xfrm_policy_id2dir(pol->index),
913 walk->seq, data);
914 if (error) {
915 list_move_tail(&walk->walk.all, &x->all);
916 goto out;
2518c7c2 917 }
12a169e7 918 walk->seq++;
1da177e4 919 }
12a169e7 920 if (walk->seq == 0) {
baf5d743
JHS		 921 error = -ENOENT;
922 goto out;
923 }
12a169e7 924 list_del_init(&walk->walk.all);
1da177e4 925out:
283bc9f3 926 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 927 return error;
928}
929EXPORT_SYMBOL(xfrm_policy_walk);
930
12a169e7
HX		 931void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
932{
933 INIT_LIST_HEAD(&walk->walk.all);
934 walk->walk.dead = 1;
935 walk->type = type;
936 walk->seq = 0;
937}
938EXPORT_SYMBOL(xfrm_policy_walk_init);
939
283bc9f3 940void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net)
12a169e7
HX		 941{
942 if (list_empty(&walk->walk.all))
943 return;
944
283bc9f3 945 write_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */
12a169e7 946 list_del(&walk->walk.all);
283bc9f3 947 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
12a169e7
HX		 948}
949EXPORT_SYMBOL(xfrm_policy_walk_done);
950
134b0fc5
JM		 951/*
952 * Find policy to apply to this flow.
953 *
954 * Returns 0 if policy found, else an -errno.
955 */
f299d557
DM		 956static int xfrm_policy_match(const struct xfrm_policy *pol,
957 const struct flowi *fl,
2518c7c2 958 u8 type, u16 family, int dir)
1da177e4 959{
f299d557 960 const struct xfrm_selector *sel = &pol->selector;
bc9b35ad
DM		 961 int ret = -ESRCH;
962 bool match;
1da177e4 963
2518c7c2 964 if (pol->family != family ||
1d28f42c 965 (fl->flowi_mark & pol->mark.m) != pol->mark.v ||
2518c7c2 966 pol->type != type)
134b0fc5 967 return ret;
1da177e4 968
2518c7c2 969 match = xfrm_selector_match(sel, fl, family);
134b0fc5 970 if (match)
1d28f42c 971 ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid,
03e1ad7b 972 dir);
2518c7c2 973
134b0fc5 974 return ret;
2518c7c2 975}
1da177e4 976
52479b62 977static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
062cdb43 978 const struct flowi *fl,
2518c7c2
DM		 979 u16 family, u8 dir)
980{
134b0fc5 981 int err;
2518c7c2 982 struct xfrm_policy *pol, *ret;
0b597e7e 983 const xfrm_address_t *daddr, *saddr;
2518c7c2 984 struct hlist_head *chain;
acba48e1 985 u32 priority = ~0U;
df71837d 986
2518c7c2
DM		 987 daddr = xfrm_flowi_daddr(fl, family);
988 saddr = xfrm_flowi_saddr(fl, family);
989 if (unlikely(!daddr || !saddr))
990 return NULL;
991
283bc9f3 992 read_lock_bh(&net->xfrm.xfrm_policy_lock);
52479b62 993 chain = policy_hash_direct(net, daddr, saddr, family, dir);
2518c7c2 994 ret = NULL;
b67bfe0d 995 hlist_for_each_entry(pol, chain, bydst) {
134b0fc5
JM		 996 err = xfrm_policy_match(pol, fl, type, family, dir);
997 if (err) {
998 if (err == -ESRCH)
999 continue;
1000 else {
1001 ret = ERR_PTR(err);
1002 goto fail;
1003 }
1004 } else {
2518c7c2 1005 ret = pol;
acba48e1 1006 priority = ret->priority;
2518c7c2
DM		 1007 break;
1008 }
1009 }
52479b62 1010 chain = &net->xfrm.policy_inexact[dir];
b67bfe0d 1011 hlist_for_each_entry(pol, chain, bydst) {
134b0fc5
JM		 1012 err = xfrm_policy_match(pol, fl, type, family, dir);
1013 if (err) {
1014 if (err == -ESRCH)
1015 continue;
1016 else {
1017 ret = ERR_PTR(err);
1018 goto fail;
1019 }
1020 } else if (pol->priority < priority) {
acba48e1
DM		 1021 ret = pol;
1022 break;
1da177e4
LT		 1023 }
1024 }
acba48e1
DM		 1025 if (ret)
1026 xfrm_pol_hold(ret);
134b0fc5 1027fail:
283bc9f3 1028 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
4e81bb83 1029
2518c7c2 1030 return ret;
4e81bb83
MN		 1031}
1032
80c802f3 1033static struct xfrm_policy *
73ff93cd 1034__xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir)
80c802f3
TT		 1035{
1036#ifdef CONFIG_XFRM_SUB_POLICY
1037 struct xfrm_policy *pol;
1038
1039 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
1040 if (pol != NULL)
1041 return pol;
1042#endif
1043 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
1044}
1045
b5fb82c4
BZ		 1046static int flow_to_policy_dir(int dir)
1047{
1048 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1049 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1050 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1051 return dir;
1052
1053 switch (dir) {
1054 default:
1055 case FLOW_DIR_IN:
1056 return XFRM_POLICY_IN;
1057 case FLOW_DIR_OUT:
1058 return XFRM_POLICY_OUT;
1059 case FLOW_DIR_FWD:
1060 return XFRM_POLICY_FWD;
1061 }
1062}
1063
fe1a5f03 1064static struct flow_cache_object *
dee9f4bc 1065xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family,
fe1a5f03 1066 u8 dir, struct flow_cache_object *old_obj, void *ctx)
4e81bb83
MN		 1067{
1068 struct xfrm_policy *pol;
fe1a5f03
TT		 1069
1070 if (old_obj)
1071 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
4e81bb83 1072
b5fb82c4 1073 pol = __xfrm_policy_lookup(net, fl, family, flow_to_policy_dir(dir));
80c802f3 1074 if (IS_ERR_OR_NULL(pol))
fe1a5f03 1075 return ERR_CAST(pol);
fe1a5f03 1076
fe1a5f03
TT		 1077 /* Resolver returns two references:
1078 * one for cache and one for caller of flow_cache_lookup() */
1079 xfrm_pol_hold(pol);
1080
1081 return &pol->flo;
1da177e4
LT		 1082}
1083
df71837d
TJ		 1084static inline int policy_to_flow_dir(int dir)
1085{
1086 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
a716c119
YH		 1087 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1088 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1089 return dir;
1090 switch (dir) {
1091 default:
1092 case XFRM_POLICY_IN:
1093 return FLOW_DIR_IN;
1094 case XFRM_POLICY_OUT:
1095 return FLOW_DIR_OUT;
1096 case XFRM_POLICY_FWD:
1097 return FLOW_DIR_FWD;
3ff50b79 1098 }
df71837d
TJ		 1099}
1100
dee9f4bc
DM		 1101static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir,
1102 const struct flowi *fl)
1da177e4
LT		 1103{
1104 struct xfrm_policy *pol;
283bc9f3 1105 struct net *net = sock_net(sk);
1da177e4 1106
283bc9f3 1107 read_lock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 1108 if ((pol = sk->sk_policy[dir]) != NULL) {
bc9b35ad
DM		 1109 bool match = xfrm_selector_match(&pol->selector, fl,
1110 sk->sk_family);
a716c119 1111 int err = 0;
df71837d 1112
3bccfbc7 1113 if (match) {
34f8d884
JHS		 1114 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1115 pol = NULL;
1116 goto out;
1117 }
03e1ad7b 1118 err = security_xfrm_policy_lookup(pol->security,
1d28f42c 1119 fl->flowi_secid,
03e1ad7b 1120 policy_to_flow_dir(dir));
3bccfbc7
VY		 1121 if (!err)
1122 xfrm_pol_hold(pol);
1123 else if (err == -ESRCH)
1124 pol = NULL;
1125 else
1126 pol = ERR_PTR(err);
1127 } else
1da177e4
LT		 1128 pol = NULL;
1129 }
34f8d884 1130out:
283bc9f3 1131 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1132 return pol;
1133}
1134
1135static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1136{
98806f75 1137 struct net *net = xp_net(pol);
1121994c 1138 struct hlist_head *chain = policy_hash_bysel(net, &pol->selector,
2518c7c2 1139 pol->family, dir);
4e81bb83 1140
98806f75 1141 list_add(&pol->walk.all, &net->xfrm.policy_all);
2518c7c2 1142 hlist_add_head(&pol->bydst, chain);
e92303f8 1143 hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index));
98806f75 1144 net->xfrm.policy_count[dir]++;
1da177e4 1145 xfrm_pol_hold(pol);
2518c7c2 1146
98806f75
AD		 1147 if (xfrm_bydst_should_resize(net, dir, NULL))
1148 schedule_work(&net->xfrm.policy_hash_work);
1da177e4
LT		 1149}
1150
1151static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1152 int dir)
1153{
98806f75
AD		 1154 struct net *net = xp_net(pol);
1155
2518c7c2
DM		 1156 if (hlist_unhashed(&pol->bydst))
1157 return NULL;
1da177e4 1158
3a9016f9 1159 hlist_del_init(&pol->bydst);
2518c7c2 1160 hlist_del(&pol->byidx);
12a169e7 1161 list_del(&pol->walk.all);
98806f75 1162 net->xfrm.policy_count[dir]--;
2518c7c2
DM		 1163
1164 return pol;
1da177e4
LT		 1165}
1166
4666faab 1167int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1da177e4 1168{
283bc9f3
FD		 1169 struct net *net = xp_net(pol);
1170
1171 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 1172 pol = __xfrm_policy_unlink(pol, dir);
283bc9f3 1173 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 1174 if (pol) {
1da177e4 1175 xfrm_policy_kill(pol);
4666faab 1176 return 0;
1da177e4 1177 }
4666faab 1178 return -ENOENT;
1da177e4 1179}
a70fcb0b 1180EXPORT_SYMBOL(xfrm_policy_delete);
1da177e4
LT		 1181
1182int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1183{
1121994c 1184 struct net *net = xp_net(pol);
1da177e4
LT		 1185 struct xfrm_policy *old_pol;
1186
4e81bb83
MN		 1187#ifdef CONFIG_XFRM_SUB_POLICY
1188 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1189 return -EINVAL;
1190#endif
1191
283bc9f3 1192 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1193 old_pol = sk->sk_policy[dir];
1194 sk->sk_policy[dir] = pol;
1195 if (pol) {
9d729f72 1196 pol->curlft.add_time = get_seconds();
e682adf0 1197 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0);
1da177e4
LT		 1198 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1199 }
a0073fe1
SK		 1200 if (old_pol) {
1201 if (pol)
1202 xfrm_policy_requeue(old_pol, pol);
1203
ea2dea9d
TT		 1204 /* Unlinking succeeds always. This is the only function
1205 * allowed to delete or replace socket policy.
1206 */
1da177e4 1207 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
a0073fe1 1208 }
283bc9f3 1209 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1210
1211 if (old_pol) {
1212 xfrm_policy_kill(old_pol);
1213 }
1214 return 0;
1215}
1216
d3e40a9f 1217static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
1da177e4 1218{
0331b1f3 1219 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
283bc9f3 1220 struct net *net = xp_net(old);
1da177e4
LT		 1221
1222 if (newp) {
1223 newp->selector = old->selector;
03e1ad7b
PM		 1224 if (security_xfrm_policy_clone(old->security,
1225 &newp->security)) {
df71837d
TJ		 1226 kfree(newp);
1227 return NULL; /* ENOMEM */
1228 }
1da177e4
LT		 1229 newp->lft = old->lft;
1230 newp->curlft = old->curlft;
fb977e2c 1231 newp->mark = old->mark;
1da177e4
LT		 1232 newp->action = old->action;
1233 newp->flags = old->flags;
1234 newp->xfrm_nr = old->xfrm_nr;
1235 newp->index = old->index;
4e81bb83 1236 newp->type = old->type;
1da177e4
LT		 1237 memcpy(newp->xfrm_vec, old->xfrm_vec,
1238 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
283bc9f3 1239 write_lock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4 1240 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
283bc9f3 1241 write_unlock_bh(&net->xfrm.xfrm_policy_lock);
1da177e4
LT		 1242 xfrm_pol_put(newp);
1243 }
1244 return newp;
1245}
1246
1247int __xfrm_sk_clone_policy(struct sock *sk)
1248{
1249 struct xfrm_policy *p0 = sk->sk_policy[0],
1250 *p1 = sk->sk_policy[1];
1251
1252 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1253 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1254 return -ENOMEM;
1255 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1256 return -ENOMEM;
1257 return 0;
1258}
1259
a1e59abf 1260static int
fbda33b2 1261xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote,
a1e59abf
PM		 1262 unsigned short family)
1263{
1264 int err;
1265 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1266
1267 if (unlikely(afinfo == NULL))
1268 return -EINVAL;
fbda33b2 1269 err = afinfo->get_saddr(net, local, remote);
a1e59abf
PM		 1270 xfrm_policy_put_afinfo(afinfo);
1271 return err;
1272}
1273
1da177e4
LT		 1274/* Resolve list of templates for the flow, given policy. */
1275
1276static int
a6c2e611
DM		 1277xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
1278 struct xfrm_state **xfrm, unsigned short family)
1da177e4 1279{
fbda33b2 1280 struct net *net = xp_net(policy);
1da177e4
LT		 1281 int nx;
1282 int i, error;
1283 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1284 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
a1e59abf 1285 xfrm_address_t tmp;
1da177e4 1286
9b7a787d 1287 for (nx = 0, i = 0; i < policy->xfrm_nr; i++) {
1da177e4
LT		 1288 struct xfrm_state *x;
1289 xfrm_address_t *remote = daddr;
1290 xfrm_address_t *local = saddr;
1291 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1292
48b8d783
JK		 1293 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1294 tmpl->mode == XFRM_MODE_BEET) {
1da177e4
LT		 1295 remote = &tmpl->id.daddr;
1296 local = &tmpl->saddr;
8444cf71
TE		 1297 if (xfrm_addr_any(local, tmpl->encap_family)) {
1298 error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family);
a1e59abf
PM		 1299 if (error)
1300 goto fail;
1301 local = &tmp;
1302 }
1da177e4
LT		 1303 }
1304
1305 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1306
1307 if (x && x->km.state == XFRM_STATE_VALID) {
1308 xfrm[nx++] = x;
1309 daddr = remote;
1310 saddr = local;
1311 continue;
1312 }
1313 if (x) {
1314 error = (x->km.state == XFRM_STATE_ERROR ?
1315 -EINVAL : -EAGAIN);
1316 xfrm_state_put(x);
42054569 1317 } else if (error == -ESRCH) {
a4322266 1318 error = -EAGAIN;
42054569 1319 }
1da177e4
LT		 1320
1321 if (!tmpl->optional)
1322 goto fail;
1323 }
1324 return nx;
1325
1326fail:
9b7a787d 1327 for (nx--; nx >= 0; nx--)
1da177e4
LT		 1328 xfrm_state_put(xfrm[nx]);
1329 return error;
1330}
1331
4e81bb83 1332static int
a6c2e611
DM		 1333xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl,
1334 struct xfrm_state **xfrm, unsigned short family)
4e81bb83 1335{
41a49cc3
MN		 1336 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1337 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
4e81bb83
MN		 1338 int cnx = 0;
1339 int error;
1340 int ret;
1341 int i;
1342
1343 for (i = 0; i < npols; i++) {
1344 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1345 error = -ENOBUFS;
1346 goto fail;
1347 }
41a49cc3
MN		 1348
1349 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
4e81bb83
MN		 1350 if (ret < 0) {
1351 error = ret;
1352 goto fail;
1353 } else
1354 cnx += ret;
1355 }
1356
41a49cc3
MN		 1357 /* found states are sorted for outbound processing */
1358 if (npols > 1)
1359 xfrm_state_sort(xfrm, tpp, cnx, family);
1360
4e81bb83
MN		 1361 return cnx;
1362
1363 fail:
9b7a787d 1364 for (cnx--; cnx >= 0; cnx--)
41a49cc3 1365 xfrm_state_put(tpp[cnx]);
4e81bb83
MN		 1366 return error;
1367
1368}
1369
1da177e4
LT		 1370/* Check that the bundle accepts the flow and its components are
1371 * still valid.
1372 */
1373
05d84025 1374static inline int xfrm_get_tos(const struct flowi *fl, int family)
25ee3286
HX		 1375{
1376 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1377 int tos;
1da177e4 1378
25ee3286
HX		 1379 if (!afinfo)
1380 return -EINVAL;
1381
1382 tos = afinfo->get_tos(fl);
1383
1384 xfrm_policy_put_afinfo(afinfo);
1385
1386 return tos;
1387}
1388
80c802f3
TT		 1389static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1390{
1391 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1392 struct dst_entry *dst = &xdst->u.dst;
1393
1394 if (xdst->route == NULL) {
1395 /* Dummy bundle - if it has xfrms we were not
1396 * able to build bundle as template resolution failed.
1397 * It means we need to try again resolving. */
1398 if (xdst->num_xfrms > 0)
1399 return NULL;
a0073fe1
SK		 1400 } else if (dst->flags & DST_XFRM_QUEUE) {
1401 return NULL;
80c802f3
TT		 1402 } else {
1403 /* Real bundle */
1404 if (stale_bundle(dst))
1405 return NULL;
1406 }
1407
1408 dst_hold(dst);
1409 return flo;
1410}
1411
1412static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1413{
1414 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1415 struct dst_entry *dst = &xdst->u.dst;
1416
1417 if (!xdst->route)
1418 return 0;
1419 if (stale_bundle(dst))
1420 return 0;
1421
1422 return 1;
1423}
1424
1425static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1426{
1427 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1428 struct dst_entry *dst = &xdst->u.dst;
1429
1430 dst_free(dst);
1431}
1432
1433static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1434 .get = xfrm_bundle_flo_get,
1435 .check = xfrm_bundle_flo_check,
1436 .delete = xfrm_bundle_flo_delete,
1437};
1438
d7c7544c 1439static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1da177e4 1440{
1da177e4 1441 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
d7c7544c 1442 struct dst_ops *dst_ops;
25ee3286
HX		 1443 struct xfrm_dst *xdst;
1444
1445 if (!afinfo)
1446 return ERR_PTR(-EINVAL);
1447
d7c7544c
AD		 1448 switch (family) {
1449 case AF_INET:
1450 dst_ops = &net->xfrm.xfrm4_dst_ops;
1451 break;
dfd56b8b 1452#if IS_ENABLED(CONFIG_IPV6)
d7c7544c
AD		 1453 case AF_INET6:
1454 dst_ops = &net->xfrm.xfrm6_dst_ops;
1455 break;
1456#endif
1457 default:
1458 BUG();
1459 }
f5b0a874 1460 xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0);
25ee3286 1461
d4cae562 1462 if (likely(xdst)) {
141e369d
SK		 1463 struct dst_entry *dst = &xdst->u.dst;
1464
1465 memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst));
0b150932 1466 xdst->flo.ops = &xfrm_bundle_fc_ops;
9d7b0fc1
PM		 1467 if (afinfo->init_dst)
1468 afinfo->init_dst(net, xdst);
d4cae562 1469 } else
0b150932 1470 xdst = ERR_PTR(-ENOBUFS);
80c802f3 1471
d4cae562
MB		 1472 xfrm_policy_put_afinfo(afinfo);
1473
25ee3286
HX		 1474 return xdst;
1475}
1476
a1b05140
MN		 1477static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1478 int nfheader_len)
1479{
1480 struct xfrm_policy_afinfo *afinfo =
1481 xfrm_policy_get_afinfo(dst->ops->family);
1482 int err;
1483
1484 if (!afinfo)
1485 return -EINVAL;
1486
1487 err = afinfo->init_path(path, dst, nfheader_len);
1488
1489 xfrm_policy_put_afinfo(afinfo);
1490
1491 return err;
1492}
1493
87c1e12b 1494static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
0c7b3eef 1495 const struct flowi *fl)
25ee3286
HX		 1496{
1497 struct xfrm_policy_afinfo *afinfo =
1498 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1499 int err;
1500
1501 if (!afinfo)
1da177e4 1502 return -EINVAL;
25ee3286 1503
87c1e12b 1504 err = afinfo->fill_dst(xdst, dev, fl);
25ee3286 1505
1da177e4 1506 xfrm_policy_put_afinfo(afinfo);
25ee3286 1507
1da177e4
LT		 1508 return err;
1509}
1510
80c802f3 1511
25ee3286
HX		 1512/* Allocate chain of dst_entry's, attach known xfrm's, calculate
1513 * all the metrics... Shortly, bundle a bundle.
1514 */
1515
1516static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1517 struct xfrm_state **xfrm, int nx,
98313ada 1518 const struct flowi *fl,
25ee3286
HX		 1519 struct dst_entry *dst)
1520{
d7c7544c 1521 struct net *net = xp_net(policy);
25ee3286
HX		 1522 unsigned long now = jiffies;
1523 struct net_device *dev;
43a4dea4 1524 struct xfrm_mode *inner_mode;
25ee3286
HX		 1525 struct dst_entry *dst_prev = NULL;
1526 struct dst_entry *dst0 = NULL;
1527 int i = 0;
1528 int err;
1529 int header_len = 0;
a1b05140 1530 int nfheader_len = 0;
25ee3286
HX		 1531 int trailer_len = 0;
1532 int tos;
1533 int family = policy->selector.family;
9bb182a7
YH		 1534 xfrm_address_t saddr, daddr;
1535
1536 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
25ee3286
HX		 1537
1538 tos = xfrm_get_tos(fl, family);
1539 err = tos;
1540 if (tos < 0)
1541 goto put_states;
1542
1543 dst_hold(dst);
1544
1545 for (; i < nx; i++) {
d7c7544c 1546 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
25ee3286
HX		 1547 struct dst_entry *dst1 = &xdst->u.dst;
1548
1549 err = PTR_ERR(xdst);
1550 if (IS_ERR(xdst)) {
1551 dst_release(dst);
1552 goto put_states;
1553 }
1554
43a4dea4
SK		 1555 if (xfrm[i]->sel.family == AF_UNSPEC) {
1556 inner_mode = xfrm_ip2inner_mode(xfrm[i],
1557 xfrm_af2proto(family));
1558 if (!inner_mode) {
1559 err = -EAFNOSUPPORT;
1560 dst_release(dst);
1561 goto put_states;
1562 }
1563 } else
1564 inner_mode = xfrm[i]->inner_mode;
1565
25ee3286
HX		 1566 if (!dst_prev)
1567 dst0 = dst1;
1568 else {
1569 dst_prev->child = dst_clone(dst1);
1570 dst1->flags |= DST_NOHASH;
1571 }
1572
1573 xdst->route = dst;
defb3519 1574 dst_copy_metrics(dst1, dst);
25ee3286
HX		 1575
1576 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1577 family = xfrm[i]->props.family;
9bb182a7
YH		 1578 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1579 family);
25ee3286
HX		 1580 err = PTR_ERR(dst);
1581 if (IS_ERR(dst))
1582 goto put_states;
1583 } else
1584 dst_hold(dst);
1585
1586 dst1->xfrm = xfrm[i];
80c802f3 1587 xdst->xfrm_genid = xfrm[i]->genid;
25ee3286 1588
f5b0a874 1589 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
25ee3286
HX		 1590 dst1->flags |= DST_HOST;
1591 dst1->lastuse = now;
1592
1593 dst1->input = dst_discard;
43a4dea4 1594 dst1->output = inner_mode->afinfo->output;
25ee3286
HX		 1595
1596 dst1->next = dst_prev;
1597 dst_prev = dst1;
1598
1599 header_len += xfrm[i]->props.header_len;
a1b05140
MN		 1600 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1601 nfheader_len += xfrm[i]->props.header_len;
25ee3286
HX		 1602 trailer_len += xfrm[i]->props.trailer_len;
1603 }
1604
1605 dst_prev->child = dst;
1606 dst0->path = dst;
1607
1608 err = -ENODEV;
1609 dev = dst->dev;
1610 if (!dev)
1611 goto free_dst;
1612
a1b05140 1613 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
25ee3286
HX		 1614 xfrm_init_pmtu(dst_prev);
1615
1616 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1617 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1618
87c1e12b 1619 err = xfrm_fill_dst(xdst, dev, fl);
25ee3286
HX		 1620 if (err)
1621 goto free_dst;
1622
1623 dst_prev->header_len = header_len;
1624 dst_prev->trailer_len = trailer_len;
1625 header_len -= xdst->u.dst.xfrm->props.header_len;
1626 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1627 }
1628
1629out:
1630 return dst0;
1631
1632put_states:
1633 for (; i < nx; i++)
1634 xfrm_state_put(xfrm[i]);
1635free_dst:
1636 if (dst0)
1637 dst_free(dst0);
1638 dst0 = ERR_PTR(err);
1639 goto out;
1640}
1641
da7c224b 1642#ifdef CONFIG_XFRM_SUB_POLICY
be7928d2 1643static int xfrm_dst_alloc_copy(void **target, const void *src, int size)
157bfc25
MN		 1644{
1645 if (!*target) {
1646 *target = kmalloc(size, GFP_ATOMIC);
1647 if (!*target)
1648 return -ENOMEM;
1649 }
be7928d2 1650
157bfc25
MN		 1651 memcpy(*target, src, size);
1652 return 0;
1653}
da7c224b 1654#endif
157bfc25 1655
be7928d2
DB		 1656static int xfrm_dst_update_parent(struct dst_entry *dst,
1657 const struct xfrm_selector *sel)
157bfc25
MN		 1658{
1659#ifdef CONFIG_XFRM_SUB_POLICY
1660 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1661 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1662 sel, sizeof(*sel));
1663#else
1664 return 0;
1665#endif
1666}
1667
be7928d2
DB		 1668static int xfrm_dst_update_origin(struct dst_entry *dst,
1669 const struct flowi *fl)
157bfc25
MN		 1670{
1671#ifdef CONFIG_XFRM_SUB_POLICY
1672 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1673 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1674#else
1675 return 0;
1676#endif
1677}
1da177e4 1678
73ff93cd 1679static int xfrm_expand_policies(const struct flowi *fl, u16 family,
80c802f3
TT		 1680 struct xfrm_policy **pols,
1681 int *num_pols, int *num_xfrms)
1682{
1683 int i;
1684
1685 if (*num_pols == 0 || !pols[0]) {
1686 *num_pols = 0;
1687 *num_xfrms = 0;
1688 return 0;
1689 }
1690 if (IS_ERR(pols[0]))
1691 return PTR_ERR(pols[0]);
1692
1693 *num_xfrms = pols[0]->xfrm_nr;
1694
1695#ifdef CONFIG_XFRM_SUB_POLICY
1696 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1697 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1698 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1699 XFRM_POLICY_TYPE_MAIN,
1700 fl, family,
1701 XFRM_POLICY_OUT);
1702 if (pols[1]) {
1703 if (IS_ERR(pols[1])) {
1704 xfrm_pols_put(pols, *num_pols);
1705 return PTR_ERR(pols[1]);
1706 }
02d0892f 1707 (*num_pols)++;
80c802f3
TT		 1708 (*num_xfrms) += pols[1]->xfrm_nr;
1709 }
1710 }
1711#endif
1712 for (i = 0; i < *num_pols; i++) {
1713 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1714 *num_xfrms = -1;
1715 break;
1716 }
1717 }
1718
1719 return 0;
1720
1721}
1722
1723static struct xfrm_dst *
1724xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
4ca2e685 1725 const struct flowi *fl, u16 family,
80c802f3
TT		 1726 struct dst_entry *dst_orig)
1727{
1728 struct net *net = xp_net(pols[0]);
1729 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1730 struct dst_entry *dst;
1731 struct xfrm_dst *xdst;
1732 int err;
1733
1734 /* Try to instantiate a bundle */
1735 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
d809ec89
TT		 1736 if (err <= 0) {
1737 if (err != 0 && err != -EAGAIN)
80c802f3
TT		 1738 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1739 return ERR_PTR(err);
1740 }
1741
1742 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1743 if (IS_ERR(dst)) {
1744 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1745 return ERR_CAST(dst);
1746 }
1747
1748 xdst = (struct xfrm_dst *)dst;
1749 xdst->num_xfrms = err;
1750 if (num_pols > 1)
1751 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1752 else
1753 err = xfrm_dst_update_origin(dst, fl);
1754 if (unlikely(err)) {
1755 dst_free(dst);
1756 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1757 return ERR_PTR(err);
1758 }
1759
1760 xdst->num_pols = num_pols;
3e94c2dc 1761 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 1762 xdst->policy_genid = atomic_read(&pols[0]->genid);
1763
1764 return xdst;
1765}
1766
a0073fe1
SK		 1767static void xfrm_policy_queue_process(unsigned long arg)
1768{
1769 int err = 0;
1770 struct sk_buff *skb;
1771 struct sock *sk;
1772 struct dst_entry *dst;
a0073fe1
SK		 1773 struct xfrm_policy *pol = (struct xfrm_policy *)arg;
1774 struct xfrm_policy_queue *pq = &pol->polq;
1775 struct flowi fl;
1776 struct sk_buff_head list;
1777
1778 spin_lock(&pq->hold_queue.lock);
1779 skb = skb_peek(&pq->hold_queue);
2bb53e25
SK		 1780 if (!skb) {
1781 spin_unlock(&pq->hold_queue.lock);
1782 goto out;
1783 }
a0073fe1
SK		 1784 dst = skb_dst(skb);
1785 sk = skb->sk;
1786 xfrm_decode_session(skb, &fl, dst->ops->family);
1787 spin_unlock(&pq->hold_queue.lock);
1788
1789 dst_hold(dst->path);
1790 dst = xfrm_lookup(xp_net(pol), dst->path, &fl,
1791 sk, 0);
1792 if (IS_ERR(dst))
1793 goto purge_queue;
1794
1795 if (dst->flags & DST_XFRM_QUEUE) {
1796 dst_release(dst);
1797
1798 if (pq->timeout >= XFRM_QUEUE_TMO_MAX)
1799 goto purge_queue;
1800
1801 pq->timeout = pq->timeout << 1;
e7d8f6cb
SK		 1802 if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout))
1803 xfrm_pol_hold(pol);
1804 goto out;
a0073fe1
SK		 1805 }
1806
1807 dst_release(dst);
1808
1809 __skb_queue_head_init(&list);
1810
1811 spin_lock(&pq->hold_queue.lock);
1812 pq->timeout = 0;
1813 skb_queue_splice_init(&pq->hold_queue, &list);
1814 spin_unlock(&pq->hold_queue.lock);
1815
1816 while (!skb_queue_empty(&list)) {
1817 skb = __skb_dequeue(&list);
1818
1819 xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family);
1820 dst_hold(skb_dst(skb)->path);
1821 dst = xfrm_lookup(xp_net(pol), skb_dst(skb)->path,
1822 &fl, skb->sk, 0);
1823 if (IS_ERR(dst)) {
a0073fe1
SK		 1824 kfree_skb(skb);
1825 continue;
1826 }
1827
1828 nf_reset(skb);
1829 skb_dst_drop(skb);
1830 skb_dst_set(skb, dst);
1831
a0073fe1 1832 err = dst_output(skb);
a0073fe1
SK		 1833 }
1834
e7d8f6cb
SK		 1835out:
1836 xfrm_pol_put(pol);
a0073fe1
SK		 1837 return;
1838
1839purge_queue:
1840 pq->timeout = 0;
1841 xfrm_queue_purge(&pq->hold_queue);
e7d8f6cb 1842 xfrm_pol_put(pol);
a0073fe1
SK		 1843}
1844
1845static int xdst_queue_output(struct sk_buff *skb)
1846{
1847 unsigned long sched_next;
1848 struct dst_entry *dst = skb_dst(skb);
1849 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
e7d8f6cb
SK		 1850 struct xfrm_policy *pol = xdst->pols[0];
1851 struct xfrm_policy_queue *pq = &pol->polq;
4d53eff4
SK		 1852 const struct sk_buff *fclone = skb + 1;
1853
1854 if (unlikely(skb->fclone == SKB_FCLONE_ORIG &&
1855 fclone->fclone == SKB_FCLONE_CLONE)) {
1856 kfree_skb(skb);
1857 return 0;
1858 }
a0073fe1
SK		 1859
1860 if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) {
1861 kfree_skb(skb);
1862 return -EAGAIN;
1863 }
1864
1865 skb_dst_force(skb);
a0073fe1
SK		 1866
1867 spin_lock_bh(&pq->hold_queue.lock);
1868
1869 if (!pq->timeout)
1870 pq->timeout = XFRM_QUEUE_TMO_MIN;
1871
1872 sched_next = jiffies + pq->timeout;
1873
1874 if (del_timer(&pq->hold_timer)) {
1875 if (time_before(pq->hold_timer.expires, sched_next))
1876 sched_next = pq->hold_timer.expires;
e7d8f6cb 1877 xfrm_pol_put(pol);
a0073fe1
SK		 1878 }
1879
1880 __skb_queue_tail(&pq->hold_queue, skb);
e7d8f6cb
SK		 1881 if (!mod_timer(&pq->hold_timer, sched_next))
1882 xfrm_pol_hold(pol);
a0073fe1
SK		 1883
1884 spin_unlock_bh(&pq->hold_queue.lock);
1885
1886 return 0;
1887}
1888
1889static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net,
1890 struct dst_entry *dst,
1891 const struct flowi *fl,
1892 int num_xfrms,
1893 u16 family)
1894{
1895 int err;
1896 struct net_device *dev;
1897 struct dst_entry *dst1;
1898 struct xfrm_dst *xdst;
1899
1900 xdst = xfrm_alloc_dst(net, family);
1901 if (IS_ERR(xdst))
1902 return xdst;
1903
5b8ef341 1904 if (net->xfrm.sysctl_larval_drop || num_xfrms <= 0)
a0073fe1
SK		 1905 return xdst;
1906
1907 dst1 = &xdst->u.dst;
1908 dst_hold(dst);
1909 xdst->route = dst;
1910
1911 dst_copy_metrics(dst1, dst);
1912
1913 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
1914 dst1->flags |= DST_HOST | DST_XFRM_QUEUE;
1915 dst1->lastuse = jiffies;
1916
1917 dst1->input = dst_discard;
1918 dst1->output = xdst_queue_output;
1919
1920 dst_hold(dst);
1921 dst1->child = dst;
1922 dst1->path = dst;
1923
1924 xfrm_init_path((struct xfrm_dst *)dst1, dst, 0);
1925
1926 err = -ENODEV;
1927 dev = dst->dev;
1928 if (!dev)
1929 goto free_dst;
1930
1931 err = xfrm_fill_dst(xdst, dev, fl);
1932 if (err)
1933 goto free_dst;
1934
1935out:
1936 return xdst;
1937
1938free_dst:
1939 dst_release(dst1);
1940 xdst = ERR_PTR(err);
1941 goto out;
1942}
1943
80c802f3 1944static struct flow_cache_object *
dee9f4bc 1945xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
80c802f3
TT		 1946 struct flow_cache_object *oldflo, void *ctx)
1947{
1948 struct dst_entry *dst_orig = (struct dst_entry *)ctx;
1949 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1950 struct xfrm_dst *xdst, *new_xdst;
1951 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
1952
1953 /* Check if the policies from old bundle are usable */
1954 xdst = NULL;
1955 if (oldflo) {
1956 xdst = container_of(oldflo, struct xfrm_dst, flo);
1957 num_pols = xdst->num_pols;
1958 num_xfrms = xdst->num_xfrms;
1959 pol_dead = 0;
1960 for (i = 0; i < num_pols; i++) {
1961 pols[i] = xdst->pols[i];
1962 pol_dead |= pols[i]->walk.dead;
1963 }
1964 if (pol_dead) {
1965 dst_free(&xdst->u.dst);
1966 xdst = NULL;
1967 num_pols = 0;
1968 num_xfrms = 0;
1969 oldflo = NULL;
1970 }
1971 }
1972
1973 /* Resolve policies to use if we couldn't get them from
1974 * previous cache entry */
1975 if (xdst == NULL) {
1976 num_pols = 1;
b5fb82c4
BZ		 1977 pols[0] = __xfrm_policy_lookup(net, fl, family,
1978 flow_to_policy_dir(dir));
80c802f3
TT		 1979 err = xfrm_expand_policies(fl, family, pols,
1980 &num_pols, &num_xfrms);
1981 if (err < 0)
1982 goto inc_error;
1983 if (num_pols == 0)
1984 return NULL;
1985 if (num_xfrms <= 0)
1986 goto make_dummy_bundle;
1987 }
1988
1989 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig);
1990 if (IS_ERR(new_xdst)) {
1991 err = PTR_ERR(new_xdst);
1992 if (err != -EAGAIN)
1993 goto error;
1994 if (oldflo == NULL)
1995 goto make_dummy_bundle;
1996 dst_hold(&xdst->u.dst);
1997 return oldflo;
d809ec89
TT		 1998 } else if (new_xdst == NULL) {
1999 num_xfrms = 0;
2000 if (oldflo == NULL)
2001 goto make_dummy_bundle;
2002 xdst->num_xfrms = 0;
2003 dst_hold(&xdst->u.dst);
2004 return oldflo;
80c802f3
TT		 2005 }
2006
2007 /* Kill the previous bundle */
2008 if (xdst) {
2009 /* The policies were stolen for newly generated bundle */
2010 xdst->num_pols = 0;
2011 dst_free(&xdst->u.dst);
2012 }
2013
2014 /* Flow cache does not have reference, it dst_free()'s,
2015 * but we do need to return one reference for original caller */
2016 dst_hold(&new_xdst->u.dst);
2017 return &new_xdst->flo;
2018
2019make_dummy_bundle:
2020 /* We found policies, but there's no bundles to instantiate:
2021 * either because the policy blocks, has no transformations or
2022 * we could not build template (no xfrm_states).*/
a0073fe1 2023 xdst = xfrm_create_dummy_bundle(net, dst_orig, fl, num_xfrms, family);
80c802f3
TT		 2024 if (IS_ERR(xdst)) {
2025 xfrm_pols_put(pols, num_pols);
2026 return ERR_CAST(xdst);
2027 }
2028 xdst->num_pols = num_pols;
2029 xdst->num_xfrms = num_xfrms;
3e94c2dc 2030 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 2031
2032 dst_hold(&xdst->u.dst);
2033 return &xdst->flo;
2034
2035inc_error:
2036 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
2037error:
2038 if (xdst != NULL)
2039 dst_free(&xdst->u.dst);
2040 else
2041 xfrm_pols_put(pols, num_pols);
2042 return ERR_PTR(err);
2043}
1da177e4 2044
2774c131
DM		 2045static struct dst_entry *make_blackhole(struct net *net, u16 family,
2046 struct dst_entry *dst_orig)
2047{
2048 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
2049 struct dst_entry *ret;
2050
2051 if (!afinfo) {
2052 dst_release(dst_orig);
433a1954 2053 return ERR_PTR(-EINVAL);
2774c131
DM		 2054 } else {
2055 ret = afinfo->blackhole_route(net, dst_orig);
2056 }
2057 xfrm_policy_put_afinfo(afinfo);
2058
2059 return ret;
2060}
2061
1da177e4
LT		 2062/* Main function: finds/creates a bundle for given flow.
2063 *
2064 * At the moment we eat a raw IP route. Mostly to speed up lookups
2065 * on interfaces with disabled IPsec.
2066 */
452edd59
DM		 2067struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
2068 const struct flowi *fl,
2069 struct sock *sk, int flags)
1da177e4 2070{
4e81bb83 2071 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
80c802f3
TT		 2072 struct flow_cache_object *flo;
2073 struct xfrm_dst *xdst;
452edd59 2074 struct dst_entry *dst, *route;
80c802f3 2075 u16 family = dst_orig->ops->family;
df71837d 2076 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
4b021628 2077 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
e0d1caa7 2078
80c802f3
TT		 2079 dst = NULL;
2080 xdst = NULL;
2081 route = NULL;
4e81bb83 2082
f7944fb1 2083 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
80c802f3
TT		 2084 num_pols = 1;
2085 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
2086 err = xfrm_expand_policies(fl, family, pols,
2087 &num_pols, &num_xfrms);
2088 if (err < 0)
75b8c133 2089 goto dropdst;
80c802f3
TT		 2090
2091 if (num_pols) {
2092 if (num_xfrms <= 0) {
2093 drop_pols = num_pols;
2094 goto no_transform;
2095 }
2096
2097 xdst = xfrm_resolve_and_create_bundle(
2098 pols, num_pols, fl,
2099 family, dst_orig);
2100 if (IS_ERR(xdst)) {
2101 xfrm_pols_put(pols, num_pols);
2102 err = PTR_ERR(xdst);
2103 goto dropdst;
d809ec89
TT		 2104 } else if (xdst == NULL) {
2105 num_xfrms = 0;
2106 drop_pols = num_pols;
2107 goto no_transform;
80c802f3
TT		 2108 }
2109
80c802f3 2110 route = xdst->route;
0aa64774 2111 }
3bccfbc7 2112 }
1da177e4 2113
80c802f3 2114 if (xdst == NULL) {
1da177e4 2115 /* To accelerate a bit... */
2518c7c2 2116 if ((dst_orig->flags & DST_NOXFRM) ||
52479b62 2117 !net->xfrm.policy_count[XFRM_POLICY_OUT])
8b7817f3 2118 goto nopol;
1da177e4 2119
80c802f3
TT		 2120 flo = flow_cache_lookup(net, fl, family, dir,
2121 xfrm_bundle_lookup, dst_orig);
2122 if (flo == NULL)
2123 goto nopol;
fe1a5f03 2124 if (IS_ERR(flo)) {
80c802f3 2125 err = PTR_ERR(flo);
75b8c133 2126 goto dropdst;
d66e37a9 2127 }
80c802f3
TT		 2128 xdst = container_of(flo, struct xfrm_dst, flo);
2129
2130 num_pols = xdst->num_pols;
2131 num_xfrms = xdst->num_xfrms;
3e94c2dc 2132 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols);
80c802f3
TT		 2133 route = xdst->route;
2134 }
2135
2136 dst = &xdst->u.dst;
2137 if (route == NULL && num_xfrms > 0) {
2138 /* The only case when xfrm_bundle_lookup() returns a
2139 * bundle with null route, is when the template could
2140 * not be resolved. It means policies are there, but
2141 * bundle could not be created, since we don't yet
2142 * have the xfrm_state's. We need to wait for KM to
2143 * negotiate new SA's or bail out with error.*/
2144 if (net->xfrm.sysctl_larval_drop) {
80c802f3 2145 dst_release(dst);
a1aa3483 2146 xfrm_pols_put(pols, drop_pols);
80c802f3 2147 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2774c131 2148
452edd59 2149 return make_blackhole(net, family, dst_orig);
80c802f3 2150 }
80c802f3 2151
5b8ef341 2152 err = -EAGAIN;
80c802f3
TT		 2153
2154 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2155 goto error;
1da177e4
LT		 2156 }
2157
80c802f3
TT		 2158no_transform:
2159 if (num_pols == 0)
8b7817f3 2160 goto nopol;
1da177e4 2161
80c802f3
TT		 2162 if ((flags & XFRM_LOOKUP_ICMP) &&
2163 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
2164 err = -ENOENT;
8b7817f3 2165 goto error;
80c802f3 2166 }
8b7817f3 2167
80c802f3
TT		 2168 for (i = 0; i < num_pols; i++)
2169 pols[i]->curlft.use_time = get_seconds();
8b7817f3 2170
80c802f3 2171 if (num_xfrms < 0) {
1da177e4 2172 /* Prohibit the flow */
59c9940e 2173 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
e104411b
PM		 2174 err = -EPERM;
2175 goto error;
80c802f3
TT		 2176 } else if (num_xfrms > 0) {
2177 /* Flow transformed */
80c802f3
TT		 2178 dst_release(dst_orig);
2179 } else {
2180 /* Flow passes untransformed */
2181 dst_release(dst);
452edd59 2182 dst = dst_orig;
1da177e4 2183 }
80c802f3
TT		 2184ok:
2185 xfrm_pols_put(pols, drop_pols);
0c183379
G		 2186 if (dst && dst->xfrm &&
2187 dst->xfrm->props.mode == XFRM_MODE_TUNNEL)
2188 dst->flags |= DST_XFRM_TUNNEL;
452edd59 2189 return dst;
1da177e4 2190
80c802f3 2191nopol:
452edd59
DM		 2192 if (!(flags & XFRM_LOOKUP_ICMP)) {
2193 dst = dst_orig;
80c802f3 2194 goto ok;
452edd59 2195 }
80c802f3 2196 err = -ENOENT;
1da177e4 2197error:
80c802f3 2198 dst_release(dst);
75b8c133
HX		 2199dropdst:
2200 dst_release(dst_orig);
80c802f3 2201 xfrm_pols_put(pols, drop_pols);
452edd59 2202 return ERR_PTR(err);
1da177e4
LT		 2203}
2204EXPORT_SYMBOL(xfrm_lookup);
2205
df0ba92a 2206static inline int
8f029de2 2207xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
df0ba92a
MN		 2208{
2209 struct xfrm_state *x;
df0ba92a
MN		 2210
2211 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
2212 return 0;
2213 x = skb->sp->xvec[idx];
2214 if (!x->type->reject)
2215 return 0;
1ecafede 2216 return x->type->reject(x, skb, fl);
df0ba92a
MN		 2217}
2218
1da177e4
LT		 2219/* When skb is transformed back to its "native" form, we have to
2220 * check policy restrictions. At the moment we make this in maximally
2221 * stupid way. Shame on me. :-) Of course, connected sockets must
2222 * have policy cached at them.
2223 */
2224
2225static inline int
7db454b9 2226xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
1da177e4
LT		 2227 unsigned short family)
2228{
2229 if (xfrm_state_kern(x))
928ba416 2230 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1da177e4
LT		 2231 return x->id.proto == tmpl->id.proto &&
2232 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
2233 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
2234 x->props.mode == tmpl->mode &&
c5d18e98 2235 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
f3bd4840 2236 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
7e49e6de
MN		 2237 !(x->props.mode != XFRM_MODE_TRANSPORT &&
2238 xfrm_state_addr_cmp(tmpl, x, family));
1da177e4
LT		 2239}
2240
df0ba92a
MN		 2241/*
2242 * 0 or more than 0 is returned when validation is succeeded (either bypass
2243 * because of optional transport mode, or next index of the mathced secpath
2244 * state with the template.
2245 * -1 is returned when no matching template is found.
2246 * Otherwise "-2 - errored_index" is returned.
2247 */
1da177e4 2248static inline int
22cccb7e 2249xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
1da177e4
LT		 2250 unsigned short family)
2251{
2252 int idx = start;
2253
2254 if (tmpl->optional) {
7e49e6de 2255 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1da177e4
LT		 2256 return start;
2257 } else
2258 start = -1;
2259 for (; idx < sp->len; idx++) {
dbe5b4aa 2260 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1da177e4 2261 return ++idx;
df0ba92a
MN		 2262 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
2263 if (start == -1)
2264 start = -2-idx;
1da177e4 2265 break;
df0ba92a 2266 }
1da177e4
LT		 2267 }
2268 return start;
2269}
2270
d5422efe
HX		 2271int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
2272 unsigned int family, int reverse)
1da177e4
LT		 2273{
2274 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
e0d1caa7 2275 int err;
1da177e4
LT		 2276
2277 if (unlikely(afinfo == NULL))
2278 return -EAFNOSUPPORT;
2279
d5422efe 2280 afinfo->decode_session(skb, fl, reverse);
1d28f42c 2281 err = security_xfrm_decode_session(skb, &fl->flowi_secid);
1da177e4 2282 xfrm_policy_put_afinfo(afinfo);
e0d1caa7 2283 return err;
1da177e4 2284}
d5422efe 2285EXPORT_SYMBOL(__xfrm_decode_session);
1da177e4 2286
9a7386ec 2287static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
1da177e4
LT		 2288{
2289 for (; k < sp->len; k++) {
df0ba92a 2290 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
d1d9facf 2291 *idxp = k;
1da177e4 2292 return 1;
df0ba92a 2293 }
1da177e4
LT		 2294 }
2295
2296 return 0;
2297}
2298
a716c119 2299int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
1da177e4
LT		 2300 unsigned short family)
2301{
f6e1e25d 2302 struct net *net = dev_net(skb->dev);
1da177e4 2303 struct xfrm_policy *pol;
4e81bb83
MN		 2304 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2305 int npols = 0;
2306 int xfrm_nr;
2307 int pi;
d5422efe 2308 int reverse;
1da177e4 2309 struct flowi fl;
d5422efe 2310 u8 fl_dir;
df0ba92a 2311 int xerr_idx = -1;
1da177e4 2312
d5422efe
HX		 2313 reverse = dir & ~XFRM_POLICY_MASK;
2314 dir &= XFRM_POLICY_MASK;
2315 fl_dir = policy_to_flow_dir(dir);
2316
0aa64774 2317 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
59c9940e 2318 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
1da177e4 2319 return 0;
0aa64774
MN		 2320 }
2321
eb9c7ebe 2322 nf_nat_decode_session(skb, &fl, family);
1da177e4
LT		 2323
2324 /* First, check used SA against their selectors. */
2325 if (skb->sp) {
2326 int i;
2327
9b7a787d 2328 for (i = skb->sp->len-1; i >= 0; i--) {
dbe5b4aa 2329 struct xfrm_state *x = skb->sp->xvec[i];
0aa64774 2330 if (!xfrm_selector_match(&x->sel, &fl, family)) {
59c9940e 2331 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
1da177e4 2332 return 0;
0aa64774 2333 }
1da177e4
LT		 2334 }
2335 }
2336
2337 pol = NULL;
3bccfbc7 2338 if (sk && sk->sk_policy[dir]) {
e0d1caa7 2339 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
0aa64774 2340 if (IS_ERR(pol)) {
59c9940e 2341 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
3bccfbc7 2342 return 0;
0aa64774 2343 }
3bccfbc7 2344 }
1da177e4 2345
fe1a5f03
TT		 2346 if (!pol) {
2347 struct flow_cache_object *flo;
2348
2349 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2350 xfrm_policy_lookup, NULL);
2351 if (IS_ERR_OR_NULL(flo))
2352 pol = ERR_CAST(flo);
2353 else
2354 pol = container_of(flo, struct xfrm_policy, flo);
2355 }
1da177e4 2356
0aa64774 2357 if (IS_ERR(pol)) {
59c9940e 2358 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
134b0fc5 2359 return 0;
0aa64774 2360 }
134b0fc5 2361
df0ba92a 2362 if (!pol) {
d1d9facf 2363 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
df0ba92a 2364 xfrm_secpath_reject(xerr_idx, skb, &fl);
59c9940e 2365 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
df0ba92a
MN		 2366 return 0;
2367 }
2368 return 1;
2369 }
1da177e4 2370
9d729f72 2371 pol->curlft.use_time = get_seconds();
1da177e4 2372
4e81bb83 2373 pols[0] = pol;
02d0892f 2374 npols++;
4e81bb83
MN		 2375#ifdef CONFIG_XFRM_SUB_POLICY
2376 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
f6e1e25d 2377 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
4e81bb83
MN		 2378 &fl, family,
2379 XFRM_POLICY_IN);
2380 if (pols[1]) {
0aa64774 2381 if (IS_ERR(pols[1])) {
59c9940e 2382 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
134b0fc5 2383 return 0;
0aa64774 2384 }
9d729f72 2385 pols[1]->curlft.use_time = get_seconds();
02d0892f 2386 npols++;
4e81bb83
MN		 2387 }
2388 }
2389#endif
2390
1da177e4
LT		 2391 if (pol->action == XFRM_POLICY_ALLOW) {
2392 struct sec_path *sp;
2393 static struct sec_path dummy;
4e81bb83 2394 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
41a49cc3 2395 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
4e81bb83
MN		 2396 struct xfrm_tmpl **tpp = tp;
2397 int ti = 0;
1da177e4
LT		 2398 int i, k;
2399
2400 if ((sp = skb->sp) == NULL)
2401 sp = &dummy;
2402
4e81bb83
MN		 2403 for (pi = 0; pi < npols; pi++) {
2404 if (pols[pi] != pol &&
0aa64774 2405 pols[pi]->action != XFRM_POLICY_ALLOW) {
59c9940e 2406 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
4e81bb83 2407 goto reject;
0aa64774
MN		 2408 }
2409 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
59c9940e 2410 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
4e81bb83 2411 goto reject_error;
0aa64774 2412 }
4e81bb83
MN		 2413 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2414 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2415 }
2416 xfrm_nr = ti;
41a49cc3 2417 if (npols > 1) {
283bc9f3 2418 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net);
41a49cc3
MN		 2419 tpp = stp;
2420 }
4e81bb83 2421
1da177e4
LT		 2422 /* For each tunnel xfrm, find the first matching tmpl.
2423 * For each tmpl before that, find corresponding xfrm.
2424 * Order is _important_. Later we will implement
2425 * some barriers, but at the moment barriers
2426 * are implied between each two transformations.
2427 */
4e81bb83
MN		 2428 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2429 k = xfrm_policy_ok(tpp[i], sp, k, family);
df0ba92a 2430 if (k < 0) {
d1d9facf
JM		 2431 if (k < -1)
2432 /* "-2 - errored_index" returned */
2433 xerr_idx = -(2+k);
59c9940e 2434 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
1da177e4 2435 goto reject;
df0ba92a 2436 }
1da177e4
LT		 2437 }
2438
0aa64774 2439 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
59c9940e 2440 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
1da177e4 2441 goto reject;
0aa64774 2442 }
1da177e4 2443
4e81bb83 2444 xfrm_pols_put(pols, npols);
1da177e4
LT		 2445 return 1;
2446 }
59c9940e 2447 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
1da177e4
LT		 2448
2449reject:
df0ba92a 2450 xfrm_secpath_reject(xerr_idx, skb, &fl);
4e81bb83
MN		 2451reject_error:
2452 xfrm_pols_put(pols, npols);
1da177e4
LT		 2453 return 0;
2454}
2455EXPORT_SYMBOL(__xfrm_policy_check);
2456
2457int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2458{
99a66657 2459 struct net *net = dev_net(skb->dev);
1da177e4 2460 struct flowi fl;
adf30907 2461 struct dst_entry *dst;
73137147 2462 int res = 1;
1da177e4 2463
0aa64774 2464 if (xfrm_decode_session(skb, &fl, family) < 0) {
72032fdb 2465 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
1da177e4 2466 return 0;
0aa64774 2467 }
1da177e4 2468
fafeeb6c 2469 skb_dst_force(skb);
adf30907 2470
452edd59
DM		 2471 dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, 0);
2472 if (IS_ERR(dst)) {
73137147 2473 res = 0;
452edd59
DM		 2474 dst = NULL;
2475 }
adf30907
ED		 2476 skb_dst_set(skb, dst);
2477 return res;
1da177e4
LT		 2478}
2479EXPORT_SYMBOL(__xfrm_route_forward);
2480
d49c73c7
DM		 2481/* Optimize later using cookies and generation ids. */
2482
1da177e4
LT		 2483static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2484{
d49c73c7 2485 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
f5b0a874
DM		 2486 * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
2487 * get validated by dst_ops->check on every use. We do this
2488 * because when a normal route referenced by an XFRM dst is
2489 * obsoleted we do not go looking around for all parent
2490 * referencing XFRM dsts so that we can invalidate them. It
2491 * is just too much work. Instead we make the checks here on
2492 * every use. For example:
d49c73c7
DM		 2493 *
2494 * XFRM dst A --> IPv4 dst X
2495 *
2496 * X is the "xdst->route" of A (X is also the "dst->path" of A
2497 * in this example). If X is marked obsolete, "A" will not
2498 * notice. That's what we are validating here via the
2499 * stale_bundle() check.
2500 *
2501 * When a policy's bundle is pruned, we dst_free() the XFRM
f5b0a874
DM		 2502 * dst which causes it's ->obsolete field to be set to
2503 * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like
2504 * this, we want to force a new route lookup.
399c180a 2505 */
d49c73c7
DM		 2506 if (dst->obsolete < 0 && !stale_bundle(dst))
2507 return dst;
2508
1da177e4
LT		 2509 return NULL;
2510}
2511
2512static int stale_bundle(struct dst_entry *dst)
2513{
12fdb4d3 2514 return !xfrm_bundle_ok((struct xfrm_dst *)dst);
1da177e4
LT		 2515}
2516
aabc9761 2517void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
1da177e4 2518{
1da177e4 2519 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
c346dca1 2520 dst->dev = dev_net(dev)->loopback_dev;
de3cb747 2521 dev_hold(dst->dev);
1da177e4
LT		 2522 dev_put(dev);
2523 }
2524}
aabc9761 2525EXPORT_SYMBOL(xfrm_dst_ifdown);
1da177e4
LT		 2526
2527static void xfrm_link_failure(struct sk_buff *skb)
2528{
2529 /* Impossible. Such dst must be popped before reaches point of failure. */
1da177e4
LT		 2530}
2531
2532static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2533{
2534 if (dst) {
2535 if (dst->obsolete) {
2536 dst_release(dst);
2537 dst = NULL;
2538 }
2539 }
2540 return dst;
2541}
2542
e4c17216 2543void xfrm_garbage_collect(struct net *net)
c0ed1c14 2544{
ca925cf1 2545 flow_cache_flush(net);
c0ed1c14 2546}
e4c17216 2547EXPORT_SYMBOL(xfrm_garbage_collect);
c0ed1c14
SK		 2548
2549static void xfrm_garbage_collect_deferred(struct net *net)
2550{
ca925cf1 2551 flow_cache_flush_deferred(net);
c0ed1c14
SK		 2552}
2553
25ee3286 2554static void xfrm_init_pmtu(struct dst_entry *dst)
1da177e4
LT		 2555{
2556 do {
2557 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2558 u32 pmtu, route_mtu_cached;
2559
2560 pmtu = dst_mtu(dst->child);
2561 xdst->child_mtu_cached = pmtu;
2562
2563 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2564
2565 route_mtu_cached = dst_mtu(xdst->route);
2566 xdst->route_mtu_cached = route_mtu_cached;
2567
2568 if (pmtu > route_mtu_cached)
2569 pmtu = route_mtu_cached;
2570
defb3519 2571 dst_metric_set(dst, RTAX_MTU, pmtu);
1da177e4
LT		 2572 } while ((dst = dst->next));
2573}
2574
1da177e4
LT		 2575/* Check that the bundle accepts the flow and its components are
2576 * still valid.
2577 */
2578
12fdb4d3 2579static int xfrm_bundle_ok(struct xfrm_dst *first)
1da177e4
LT		 2580{
2581 struct dst_entry *dst = &first->u.dst;
2582 struct xfrm_dst *last;
2583 u32 mtu;
2584
92d63dec 2585 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
1da177e4
LT		 2586 (dst->dev && !netif_running(dst->dev)))
2587 return 0;
2588
a0073fe1
SK		 2589 if (dst->flags & DST_XFRM_QUEUE)
2590 return 1;
2591
1da177e4
LT		 2592 last = NULL;
2593
2594 do {
2595 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2596
1da177e4
LT		 2597 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2598 return 0;
80c802f3
TT		 2599 if (xdst->xfrm_genid != dst->xfrm->genid)
2600 return 0;
b1312c89
TT		 2601 if (xdst->num_pols > 0 &&
2602 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
9d4a706d 2603 return 0;
e53820de 2604
1da177e4
LT		 2605 mtu = dst_mtu(dst->child);
2606 if (xdst->child_mtu_cached != mtu) {
2607 last = xdst;
2608 xdst->child_mtu_cached = mtu;
2609 }
2610
92d63dec 2611 if (!dst_check(xdst->route, xdst->route_cookie))
1da177e4
LT		 2612 return 0;
2613 mtu = dst_mtu(xdst->route);
2614 if (xdst->route_mtu_cached != mtu) {
2615 last = xdst;
2616 xdst->route_mtu_cached = mtu;
2617 }
2618
2619 dst = dst->child;
2620 } while (dst->xfrm);
2621
2622 if (likely(!last))
2623 return 1;
2624
2625 mtu = last->child_mtu_cached;
2626 for (;;) {
2627 dst = &last->u.dst;
2628
2629 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2630 if (mtu > last->route_mtu_cached)
2631 mtu = last->route_mtu_cached;
defb3519 2632 dst_metric_set(dst, RTAX_MTU, mtu);
1da177e4
LT		 2633
2634 if (last == first)
2635 break;
2636
bd0bf076 2637 last = (struct xfrm_dst *)last->u.dst.next;
1da177e4
LT		 2638 last->child_mtu_cached = mtu;
2639 }
2640
2641 return 1;
2642}
2643
0dbaee3b
DM		 2644static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2645{
2646 return dst_metric_advmss(dst->path);
2647}
2648
ebb762f2 2649static unsigned int xfrm_mtu(const struct dst_entry *dst)
d33e4553 2650{
618f9bc7
SK		 2651 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
2652
2653 return mtu ? : dst_mtu(dst->path);
d33e4553
DM		 2654}
2655
f894cbf8
DM		 2656static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
2657 struct sk_buff *skb,
2658 const void *daddr)
d3aaeb38 2659{
f894cbf8 2660 return dst->path->ops->neigh_lookup(dst, skb, daddr);
d3aaeb38
DM		 2661}
2662
1da177e4
LT		 2663int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2664{
d7c7544c 2665 struct net *net;
1da177e4
LT		 2666 int err = 0;
2667 if (unlikely(afinfo == NULL))
2668 return -EINVAL;
2669 if (unlikely(afinfo->family >= NPROTO))
2670 return -EAFNOSUPPORT;
ef8531b6 2671 spin_lock(&xfrm_policy_afinfo_lock);
1da177e4
LT		 2672 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2673 err = -ENOBUFS;
2674 else {
2675 struct dst_ops *dst_ops = afinfo->dst_ops;
2676 if (likely(dst_ops->kmem_cachep == NULL))
2677 dst_ops->kmem_cachep = xfrm_dst_cache;
2678 if (likely(dst_ops->check == NULL))
2679 dst_ops->check = xfrm_dst_check;
0dbaee3b
DM		 2680 if (likely(dst_ops->default_advmss == NULL))
2681 dst_ops->default_advmss = xfrm_default_advmss;
ebb762f2
SK		 2682 if (likely(dst_ops->mtu == NULL))
2683 dst_ops->mtu = xfrm_mtu;
1da177e4
LT		 2684 if (likely(dst_ops->negative_advice == NULL))
2685 dst_ops->negative_advice = xfrm_negative_advice;
2686 if (likely(dst_ops->link_failure == NULL))
2687 dst_ops->link_failure = xfrm_link_failure;
d3aaeb38
DM		 2688 if (likely(dst_ops->neigh_lookup == NULL))
2689 dst_ops->neigh_lookup = xfrm_neigh_lookup;
1da177e4 2690 if (likely(afinfo->garbage_collect == NULL))
c0ed1c14 2691 afinfo->garbage_collect = xfrm_garbage_collect_deferred;
418a99ac 2692 rcu_assign_pointer(xfrm_policy_afinfo[afinfo->family], afinfo);
1da177e4 2693 }
ef8531b6 2694 spin_unlock(&xfrm_policy_afinfo_lock);
d7c7544c
AD		 2695
2696 rtnl_lock();
2697 for_each_net(net) {
2698 struct dst_ops *xfrm_dst_ops;
2699
2700 switch (afinfo->family) {
2701 case AF_INET:
2702 xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops;
2703 break;
dfd56b8b 2704#if IS_ENABLED(CONFIG_IPV6)
d7c7544c
AD		 2705 case AF_INET6:
2706 xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops;
2707 break;
2708#endif
2709 default:
2710 BUG();
2711 }
2712 *xfrm_dst_ops = *afinfo->dst_ops;
2713 }
2714 rtnl_unlock();
2715
1da177e4
LT		 2716 return err;
2717}
2718EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2719
2720int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2721{
2722 int err = 0;
2723 if (unlikely(afinfo == NULL))
2724 return -EINVAL;
2725 if (unlikely(afinfo->family >= NPROTO))
2726 return -EAFNOSUPPORT;
ef8531b6 2727 spin_lock(&xfrm_policy_afinfo_lock);
1da177e4
LT		 2728 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2729 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2730 err = -EINVAL;
ef8531b6
ED		 2731 else
2732 RCU_INIT_POINTER(xfrm_policy_afinfo[afinfo->family],
2733 NULL);
2734 }
2735 spin_unlock(&xfrm_policy_afinfo_lock);
2736 if (!err) {
2737 struct dst_ops *dst_ops = afinfo->dst_ops;
2738
2739 synchronize_rcu();
2740
2741 dst_ops->kmem_cachep = NULL;
2742 dst_ops->check = NULL;
2743 dst_ops->negative_advice = NULL;
2744 dst_ops->link_failure = NULL;
2745 afinfo->garbage_collect = NULL;
1da177e4 2746 }
1da177e4
LT		 2747 return err;
2748}
2749EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2750
d7c7544c
AD		 2751static void __net_init xfrm_dst_ops_init(struct net *net)
2752{
2753 struct xfrm_policy_afinfo *afinfo;
2754
ef8531b6
ED		 2755 rcu_read_lock();
2756 afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET]);
d7c7544c
AD		 2757 if (afinfo)
2758 net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops;
dfd56b8b 2759#if IS_ENABLED(CONFIG_IPV6)
ef8531b6 2760 afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET6]);
d7c7544c
AD		 2761 if (afinfo)
2762 net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops;
2763#endif
418a99ac 2764 rcu_read_unlock();
546be240
HX		 2765}
2766
1da177e4
LT		 2767static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2768{
351638e7 2769 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
e9dc8653 2770
1da177e4
LT		 2771 switch (event) {
2772 case NETDEV_DOWN:
c0ed1c14 2773 xfrm_garbage_collect(dev_net(dev));
1da177e4
LT		 2774 }
2775 return NOTIFY_DONE;
2776}
2777
2778static struct notifier_block xfrm_dev_notifier = {
d5917a35 2779 .notifier_call = xfrm_dev_event,
1da177e4
LT		 2780};
2781
558f82ef 2782#ifdef CONFIG_XFRM_STATISTICS
59c9940e 2783static int __net_init xfrm_statistics_init(struct net *net)
558f82ef 2784{
c68cd1a0
AD		 2785 int rv;
2786
7d720c3e 2787 if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics,
1823e4c8
ED		 2788 sizeof(struct linux_xfrm_mib),
2789 __alignof__(struct linux_xfrm_mib)) < 0)
558f82ef 2790 return -ENOMEM;
c68cd1a0
AD		 2791 rv = xfrm_proc_init(net);
2792 if (rv < 0)
7d720c3e 2793 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
c68cd1a0 2794 return rv;
558f82ef 2795}
59c9940e
AD		 2796
2797static void xfrm_statistics_fini(struct net *net)
2798{
c68cd1a0 2799 xfrm_proc_fini(net);
7d720c3e 2800 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
59c9940e
AD		 2801}
2802#else
2803static int __net_init xfrm_statistics_init(struct net *net)
2804{
2805 return 0;
2806}
2807
2808static void xfrm_statistics_fini(struct net *net)
2809{
2810}
558f82ef
MN		 2811#endif
2812
d62ddc21 2813static int __net_init xfrm_policy_init(struct net *net)
1da177e4 2814{
2518c7c2
DM		 2815 unsigned int hmask, sz;
2816 int dir;
2817
d62ddc21
AD		 2818 if (net_eq(net, &init_net))
2819 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
1da177e4 2820 sizeof(struct xfrm_dst),
e5d679f3 2821 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
20c2df83 2822 NULL);
1da177e4 2823
2518c7c2
DM		 2824 hmask = 8 - 1;
2825 sz = (hmask+1) * sizeof(struct hlist_head);
2826
93b851c1
AD		 2827 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2828 if (!net->xfrm.policy_byidx)
2829 goto out_byidx;
8100bea7 2830 net->xfrm.policy_idx_hmask = hmask;
2518c7c2
DM		 2831
2832 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2833 struct xfrm_policy_hash *htab;
2834
dc2caba7 2835 net->xfrm.policy_count[dir] = 0;
8b18f8ea 2836 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2518c7c2 2837
a35f6c5d 2838 htab = &net->xfrm.policy_bydst[dir];
44e36b42 2839 htab->table = xfrm_hash_alloc(sz);
2518c7c2 2840 if (!htab->table)
a35f6c5d
AD		 2841 goto out_bydst;
2842 htab->hmask = hmask;
2518c7c2
DM		 2843 }
2844
adfcf0b2 2845 INIT_LIST_HEAD(&net->xfrm.policy_all);
66caf628 2846 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
d62ddc21
AD		 2847 if (net_eq(net, &init_net))
2848 register_netdevice_notifier(&xfrm_dev_notifier);
2849 return 0;
93b851c1 2850
a35f6c5d
AD		 2851out_bydst:
2852 for (dir--; dir >= 0; dir--) {
2853 struct xfrm_policy_hash *htab;
2854
2855 htab = &net->xfrm.policy_bydst[dir];
2856 xfrm_hash_free(htab->table, sz);
2857 }
2858 xfrm_hash_free(net->xfrm.policy_byidx, sz);
93b851c1
AD		 2859out_byidx:
2860 return -ENOMEM;
d62ddc21
AD		 2861}
2862
2863static void xfrm_policy_fini(struct net *net)
2864{
7c2776ee 2865 struct xfrm_audit audit_info;
93b851c1 2866 unsigned int sz;
8b18f8ea 2867 int dir;
93b851c1 2868
7c2776ee
AD		 2869 flush_work(&net->xfrm.policy_hash_work);
2870#ifdef CONFIG_XFRM_SUB_POLICY
e1760bd5 2871 audit_info.loginuid = INVALID_UID;
4440e854 2872 audit_info.sessionid = (unsigned int)-1;
7c2776ee
AD		 2873 audit_info.secid = 0;
2874 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info);
2875#endif
e1760bd5 2876 audit_info.loginuid = INVALID_UID;
4440e854 2877 audit_info.sessionid = (unsigned int)-1;
7c2776ee
AD		 2878 audit_info.secid = 0;
2879 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
7c2776ee 2880
adfcf0b2 2881 WARN_ON(!list_empty(&net->xfrm.policy_all));
93b851c1 2882
8b18f8ea 2883 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
a35f6c5d
AD		 2884 struct xfrm_policy_hash *htab;
2885
8b18f8ea 2886 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
a35f6c5d
AD		 2887
2888 htab = &net->xfrm.policy_bydst[dir];
5b653b2a 2889 sz = (htab->hmask + 1) * sizeof(struct hlist_head);
a35f6c5d
AD		 2890 WARN_ON(!hlist_empty(htab->table));
2891 xfrm_hash_free(htab->table, sz);
8b18f8ea
AD		 2892 }
2893
8100bea7 2894 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
93b851c1
AD		 2895 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
2896 xfrm_hash_free(net->xfrm.policy_byidx, sz);
1da177e4
LT		 2897}
2898
d62ddc21
AD		 2899static int __net_init xfrm_net_init(struct net *net)
2900{
2901 int rv;
2902
59c9940e
AD		 2903 rv = xfrm_statistics_init(net);
2904 if (rv < 0)
2905 goto out_statistics;
d62ddc21
AD		 2906 rv = xfrm_state_init(net);
2907 if (rv < 0)
2908 goto out_state;
2909 rv = xfrm_policy_init(net);
2910 if (rv < 0)
2911 goto out_policy;
d7c7544c 2912 xfrm_dst_ops_init(net);
b27aeadb
AD		 2913 rv = xfrm_sysctl_init(net);
2914 if (rv < 0)
2915 goto out_sysctl;
283bc9f3
FD		 2916
2917 /* Initialize the per-net locks here */
2918 spin_lock_init(&net->xfrm.xfrm_state_lock);
2919 rwlock_init(&net->xfrm.xfrm_policy_lock);
283bc9f3
FD		 2920 mutex_init(&net->xfrm.xfrm_cfg_mutex);
2921
ca925cf1 2922 flow_cache_init(net);
d62ddc21
AD		 2923 return 0;
2924
b27aeadb
AD		 2925out_sysctl:
2926 xfrm_policy_fini(net);
d62ddc21
AD		 2927out_policy:
2928 xfrm_state_fini(net);
2929out_state:
59c9940e
AD		 2930 xfrm_statistics_fini(net);
2931out_statistics:
d62ddc21
AD		 2932 return rv;
2933}
2934
2935static void __net_exit xfrm_net_exit(struct net *net)
2936{
b27aeadb 2937 xfrm_sysctl_fini(net);
d62ddc21
AD		 2938 xfrm_policy_fini(net);
2939 xfrm_state_fini(net);
59c9940e 2940 xfrm_statistics_fini(net);
d62ddc21
AD		 2941}
2942
2943static struct pernet_operations __net_initdata xfrm_net_ops = {
2944 .init = xfrm_net_init,
2945 .exit = xfrm_net_exit,
2946};
2947
1da177e4
LT		 2948void __init xfrm_init(void)
2949{
d62ddc21 2950 register_pernet_subsys(&xfrm_net_ops);
1da177e4
LT		 2951 xfrm_input_init();
2952}
2953
ab5f5e8b 2954#ifdef CONFIG_AUDITSYSCALL
1486cbd7
IJ		 2955static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
2956 struct audit_buffer *audit_buf)
ab5f5e8b 2957{
875179fa
PM		 2958 struct xfrm_sec_ctx *ctx = xp->security;
2959 struct xfrm_selector *sel = &xp->selector;
2960
2961 if (ctx)
ab5f5e8b 2962 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
875179fa 2963 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
ab5f5e8b 2964
9b7a787d 2965 switch (sel->family) {
ab5f5e8b 2966 case AF_INET:
21454aaa 2967 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
875179fa
PM		 2968 if (sel->prefixlen_s != 32)
2969 audit_log_format(audit_buf, " src_prefixlen=%d",
2970 sel->prefixlen_s);
21454aaa 2971 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
875179fa
PM		 2972 if (sel->prefixlen_d != 32)
2973 audit_log_format(audit_buf, " dst_prefixlen=%d",
2974 sel->prefixlen_d);
ab5f5e8b
JL		 2975 break;
2976 case AF_INET6:
5b095d98 2977 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
875179fa
PM		 2978 if (sel->prefixlen_s != 128)
2979 audit_log_format(audit_buf, " src_prefixlen=%d",
2980 sel->prefixlen_s);
5b095d98 2981 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
875179fa
PM		 2982 if (sel->prefixlen_d != 128)
2983 audit_log_format(audit_buf, " dst_prefixlen=%d",
2984 sel->prefixlen_d);
ab5f5e8b
JL		 2985 break;
2986 }
2987}
2988
68277acc 2989void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
4440e854 2990 kuid_t auid, unsigned int sessionid, u32 secid)
ab5f5e8b
JL		 2991{
2992 struct audit_buffer *audit_buf;
ab5f5e8b 2993
afeb14b4 2994 audit_buf = xfrm_audit_start("SPD-add");
ab5f5e8b
JL		 2995 if (audit_buf == NULL)
2996 return;
2532386f 2997 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
afeb14b4 2998 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL		 2999 xfrm_audit_common_policyinfo(xp, audit_buf);
3000 audit_log_end(audit_buf);
3001}
3002EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
3003
68277acc 3004void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
4440e854 3005 kuid_t auid, unsigned int sessionid, u32 secid)
ab5f5e8b
JL		 3006{
3007 struct audit_buffer *audit_buf;
ab5f5e8b 3008
afeb14b4 3009 audit_buf = xfrm_audit_start("SPD-delete");
ab5f5e8b
JL		 3010 if (audit_buf == NULL)
3011 return;
2532386f 3012 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
afeb14b4 3013 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL		 3014 xfrm_audit_common_policyinfo(xp, audit_buf);
3015 audit_log_end(audit_buf);
3016}
3017EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
3018#endif
3019
80c9abaa 3020#ifdef CONFIG_XFRM_MIGRATE
bc9b35ad
DM		 3021static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
3022 const struct xfrm_selector *sel_tgt)
80c9abaa
SS		 3023{
3024 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
3025 if (sel_tgt->family == sel_cmp->family &&
70e94e66
YH		 3026 xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr,
3027 sel_cmp->family) &&
3028 xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr,
3029 sel_cmp->family) &&
80c9abaa
SS		 3030 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
3031 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
bc9b35ad 3032 return true;
80c9abaa
SS		 3033 }
3034 } else {
3035 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
bc9b35ad 3036 return true;
80c9abaa
SS		 3037 }
3038 }
bc9b35ad 3039 return false;
80c9abaa
SS		 3040}
3041
3e94c2dc
WC		 3042static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel,
3043 u8 dir, u8 type, struct net *net)
80c9abaa
SS		 3044{
3045 struct xfrm_policy *pol, *ret = NULL;
80c9abaa
SS		 3046 struct hlist_head *chain;
3047 u32 priority = ~0U;
3048
283bc9f3 3049 read_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME*/
8d549c4f 3050 chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir);
b67bfe0d 3051 hlist_for_each_entry(pol, chain, bydst) {
80c9abaa
SS		 3052 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3053 pol->type == type) {
3054 ret = pol;
3055 priority = ret->priority;
3056 break;
3057 }
3058 }
8d549c4f 3059 chain = &net->xfrm.policy_inexact[dir];
b67bfe0d 3060 hlist_for_each_entry(pol, chain, bydst) {
80c9abaa
SS		 3061 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3062 pol->type == type &&
3063 pol->priority < priority) {
3064 ret = pol;
3065 break;
3066 }
3067 }
3068
3069 if (ret)
3070 xfrm_pol_hold(ret);
3071
283bc9f3 3072 read_unlock_bh(&net->xfrm.xfrm_policy_lock);
80c9abaa
SS		 3073
3074 return ret;
3075}
3076
dd701754 3077static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
80c9abaa
SS		 3078{
3079 int match = 0;
3080
3081 if (t->mode == m->mode && t->id.proto == m->proto &&
3082 (m->reqid == 0 || t->reqid == m->reqid)) {
3083 switch (t->mode) {
3084 case XFRM_MODE_TUNNEL:
3085 case XFRM_MODE_BEET:
70e94e66
YH		 3086 if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr,
3087 m->old_family) &&
3088 xfrm_addr_equal(&t->saddr, &m->old_saddr,
3089 m->old_family)) {
80c9abaa
SS		 3090 match = 1;
3091 }
3092 break;
3093 case XFRM_MODE_TRANSPORT:
3094 /* in case of transport mode, template does not store
3095 any IP addresses, hence we just compare mode and
3096 protocol */
3097 match = 1;
3098 break;
3099 default:
3100 break;
3101 }
3102 }
3103 return match;
3104}
3105
3106/* update endpoint address(es) of template(s) */
3107static int xfrm_policy_migrate(struct xfrm_policy *pol,
3108 struct xfrm_migrate *m, int num_migrate)
3109{
3110 struct xfrm_migrate *mp;
80c9abaa
SS		 3111 int i, j, n = 0;
3112
3113 write_lock_bh(&pol->lock);
12a169e7 3114 if (unlikely(pol->walk.dead)) {
80c9abaa
SS		 3115 /* target policy has been deleted */
3116 write_unlock_bh(&pol->lock);
3117 return -ENOENT;
3118 }
3119
3120 for (i = 0; i < pol->xfrm_nr; i++) {
3121 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
3122 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
3123 continue;
3124 n++;
1bfcb10f
HX		 3125 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
3126 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
80c9abaa
SS		 3127 continue;
3128 /* update endpoints */
3129 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
3130 sizeof(pol->xfrm_vec[i].id.daddr));
3131 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
3132 sizeof(pol->xfrm_vec[i].saddr));
3133 pol->xfrm_vec[i].encap_family = mp->new_family;
3134 /* flush bundles */
80c802f3 3135 atomic_inc(&pol->genid);
80c9abaa
SS		 3136 }
3137 }
3138
3139 write_unlock_bh(&pol->lock);
3140
3141 if (!n)
3142 return -ENODATA;
3143
3144 return 0;
3145}
3146
dd701754 3147static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
80c9abaa
SS		 3148{
3149 int i, j;
3150
3151 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
3152 return -EINVAL;
3153
3154 for (i = 0; i < num_migrate; i++) {
70e94e66
YH		 3155 if (xfrm_addr_equal(&m[i].old_daddr, &m[i].new_daddr,
3156 m[i].old_family) &&
3157 xfrm_addr_equal(&m[i].old_saddr, &m[i].new_saddr,
3158 m[i].old_family))
80c9abaa
SS		 3159 return -EINVAL;
3160 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
3161 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
3162 return -EINVAL;
3163
3164 /* check if there is any duplicated entry */
3165 for (j = i + 1; j < num_migrate; j++) {
3166 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
3167 sizeof(m[i].old_daddr)) &&
3168 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
3169 sizeof(m[i].old_saddr)) &&
3170 m[i].proto == m[j].proto &&
3171 m[i].mode == m[j].mode &&
3172 m[i].reqid == m[j].reqid &&
3173 m[i].old_family == m[j].old_family)
3174 return -EINVAL;
3175 }
3176 }
3177
3178 return 0;
3179}
3180
b4b7c0b3 3181int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
13c1d189 3182 struct xfrm_migrate *m, int num_migrate,
8d549c4f 3183 struct xfrm_kmaddress *k, struct net *net)
80c9abaa
SS		 3184{
3185 int i, err, nx_cur = 0, nx_new = 0;
3186 struct xfrm_policy *pol = NULL;
3187 struct xfrm_state *x, *xc;
3188 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
3189 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
3190 struct xfrm_migrate *mp;
3191
3192 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
3193 goto out;
3194
3195 /* Stage 1 - find policy */
8d549c4f 3196 if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) {
80c9abaa
SS		 3197 err = -ENOENT;
3198 goto out;
3199 }
3200
3201 /* Stage 2 - find and update state(s) */
3202 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
283bc9f3 3203 if ((x = xfrm_migrate_state_find(mp, net))) {
80c9abaa
SS		 3204 x_cur[nx_cur] = x;
3205 nx_cur++;
3206 if ((xc = xfrm_state_migrate(x, mp))) {
3207 x_new[nx_new] = xc;
3208 nx_new++;
3209 } else {
3210 err = -ENODATA;
3211 goto restore_state;
3212 }
3213 }
3214 }
3215
3216 /* Stage 3 - update policy */
3217 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
3218 goto restore_state;
3219
3220 /* Stage 4 - delete old state(s) */
3221 if (nx_cur) {
3222 xfrm_states_put(x_cur, nx_cur);
3223 xfrm_states_delete(x_cur, nx_cur);
3224 }
3225
3226 /* Stage 5 - announce */
13c1d189 3227 km_migrate(sel, dir, type, m, num_migrate, k);
80c9abaa
SS		 3228
3229 xfrm_pol_put(pol);
3230
3231 return 0;
3232out:
3233 return err;
3234
3235restore_state:
3236 if (pol)
3237 xfrm_pol_put(pol);
3238 if (nx_cur)
3239 xfrm_states_put(x_cur, nx_cur);
3240 if (nx_new)
3241 xfrm_states_delete(x_new, nx_new);
3242
3243 return err;
3244}
e610e679 3245EXPORT_SYMBOL(xfrm_migrate);
80c9abaa 3246#endif
Linux 6.x block layer and io_uring tree(s)