Root/net/xfrm/xfrm_state.c

1/*
2 * xfrm_state.c
3 *
4 * Changes:
5 * Mitsuru KANDA @USAGI
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
8 * IPv6 support
9 * YOSHIFUJI Hideaki @USAGI
10 * Split up af-specific functions
11 * Derek Atkins <derek@ihtfp.com>
12 * Add UDP Encapsulation
13 *
14 */
15
16#include <linux/workqueue.h>
17#include <net/xfrm.h>
18#include <linux/pfkeyv2.h>
19#include <linux/ipsec.h>
20#include <linux/module.h>
21#include <linux/cache.h>
22#include <linux/audit.h>
23#include <asm/uaccess.h>
24#include <linux/ktime.h>
25#include <linux/slab.h>
26#include <linux/interrupt.h>
27#include <linux/kernel.h>
28
29#include "xfrm_hash.h"
30
31/* Each xfrm_state may be linked to two tables:
32
33   1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
34   2. Hash table by (daddr,family,reqid) to find what SAs exist for given
35      destination/tunnel endpoint. (output)
36 */
37
38static DEFINE_SPINLOCK(xfrm_state_lock);
39
40static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
41
42static inline unsigned int xfrm_dst_hash(struct net *net,
43                     const xfrm_address_t *daddr,
44                     const xfrm_address_t *saddr,
45                     u32 reqid,
46                     unsigned short family)
47{
48    return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
49}
50
51static inline unsigned int xfrm_src_hash(struct net *net,
52                     const xfrm_address_t *daddr,
53                     const xfrm_address_t *saddr,
54                     unsigned short family)
55{
56    return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
57}
58
59static inline unsigned int
60xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
61          __be32 spi, u8 proto, unsigned short family)
62{
63    return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
64}
65
66static void xfrm_hash_transfer(struct hlist_head *list,
67                   struct hlist_head *ndsttable,
68                   struct hlist_head *nsrctable,
69                   struct hlist_head *nspitable,
70                   unsigned int nhashmask)
71{
72    struct hlist_node *tmp;
73    struct xfrm_state *x;
74
75    hlist_for_each_entry_safe(x, tmp, list, bydst) {
76        unsigned int h;
77
78        h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
79                    x->props.reqid, x->props.family,
80                    nhashmask);
81        hlist_add_head(&x->bydst, ndsttable+h);
82
83        h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
84                    x->props.family,
85                    nhashmask);
86        hlist_add_head(&x->bysrc, nsrctable+h);
87
88        if (x->id.spi) {
89            h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
90                        x->id.proto, x->props.family,
91                        nhashmask);
92            hlist_add_head(&x->byspi, nspitable+h);
93        }
94    }
95}
96
97static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
98{
99    return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
100}
101
102static DEFINE_MUTEX(hash_resize_mutex);
103
104static void xfrm_hash_resize(struct work_struct *work)
105{
106    struct net *net = container_of(work, struct net, xfrm.state_hash_work);
107    struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
108    unsigned long nsize, osize;
109    unsigned int nhashmask, ohashmask;
110    int i;
111
112    mutex_lock(&hash_resize_mutex);
113
114    nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
115    ndst = xfrm_hash_alloc(nsize);
116    if (!ndst)
117        goto out_unlock;
118    nsrc = xfrm_hash_alloc(nsize);
119    if (!nsrc) {
120        xfrm_hash_free(ndst, nsize);
121        goto out_unlock;
122    }
123    nspi = xfrm_hash_alloc(nsize);
124    if (!nspi) {
125        xfrm_hash_free(ndst, nsize);
126        xfrm_hash_free(nsrc, nsize);
127        goto out_unlock;
128    }
129
130    spin_lock_bh(&xfrm_state_lock);
131
132    nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
133    for (i = net->xfrm.state_hmask; i >= 0; i--)
134        xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi,
135                   nhashmask);
136
137    odst = net->xfrm.state_bydst;
138    osrc = net->xfrm.state_bysrc;
139    ospi = net->xfrm.state_byspi;
140    ohashmask = net->xfrm.state_hmask;
141
142    net->xfrm.state_bydst = ndst;
143    net->xfrm.state_bysrc = nsrc;
144    net->xfrm.state_byspi = nspi;
145    net->xfrm.state_hmask = nhashmask;
146
147    spin_unlock_bh(&xfrm_state_lock);
148
149    osize = (ohashmask + 1) * sizeof(struct hlist_head);
150    xfrm_hash_free(odst, osize);
151    xfrm_hash_free(osrc, osize);
152    xfrm_hash_free(ospi, osize);
153
154out_unlock:
155    mutex_unlock(&hash_resize_mutex);
156}
157
158static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
159static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
160
161static DEFINE_SPINLOCK(xfrm_state_gc_lock);
162
163int __xfrm_state_delete(struct xfrm_state *x);
164
165int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
166void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
167
168static DEFINE_SPINLOCK(xfrm_type_lock);
169int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
170{
171    struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
172    const struct xfrm_type **typemap;
173    int err = 0;
174
175    if (unlikely(afinfo == NULL))
176        return -EAFNOSUPPORT;
177    typemap = afinfo->type_map;
178    spin_lock_bh(&xfrm_type_lock);
179
180    if (likely(typemap[type->proto] == NULL))
181        typemap[type->proto] = type;
182    else
183        err = -EEXIST;
184    spin_unlock_bh(&xfrm_type_lock);
185    xfrm_state_put_afinfo(afinfo);
186    return err;
187}
188EXPORT_SYMBOL(xfrm_register_type);
189
190int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
191{
192    struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
193    const struct xfrm_type **typemap;
194    int err = 0;
195
196    if (unlikely(afinfo == NULL))
197        return -EAFNOSUPPORT;
198    typemap = afinfo->type_map;
199    spin_lock_bh(&xfrm_type_lock);
200
201    if (unlikely(typemap[type->proto] != type))
202        err = -ENOENT;
203    else
204        typemap[type->proto] = NULL;
205    spin_unlock_bh(&xfrm_type_lock);
206    xfrm_state_put_afinfo(afinfo);
207    return err;
208}
209EXPORT_SYMBOL(xfrm_unregister_type);
210
211static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
212{
213    struct xfrm_state_afinfo *afinfo;
214    const struct xfrm_type **typemap;
215    const struct xfrm_type *type;
216    int modload_attempted = 0;
217
218retry:
219    afinfo = xfrm_state_get_afinfo(family);
220    if (unlikely(afinfo == NULL))
221        return NULL;
222    typemap = afinfo->type_map;
223
224    type = typemap[proto];
225    if (unlikely(type && !try_module_get(type->owner)))
226        type = NULL;
227    if (!type && !modload_attempted) {
228        xfrm_state_put_afinfo(afinfo);
229        request_module("xfrm-type-%d-%d", family, proto);
230        modload_attempted = 1;
231        goto retry;
232    }
233
234    xfrm_state_put_afinfo(afinfo);
235    return type;
236}
237
238static void xfrm_put_type(const struct xfrm_type *type)
239{
240    module_put(type->owner);
241}
242
243static DEFINE_SPINLOCK(xfrm_mode_lock);
244int xfrm_register_mode(struct xfrm_mode *mode, int family)
245{
246    struct xfrm_state_afinfo *afinfo;
247    struct xfrm_mode **modemap;
248    int err;
249
250    if (unlikely(mode->encap >= XFRM_MODE_MAX))
251        return -EINVAL;
252
253    afinfo = xfrm_state_get_afinfo(family);
254    if (unlikely(afinfo == NULL))
255        return -EAFNOSUPPORT;
256
257    err = -EEXIST;
258    modemap = afinfo->mode_map;
259    spin_lock_bh(&xfrm_mode_lock);
260    if (modemap[mode->encap])
261        goto out;
262
263    err = -ENOENT;
264    if (!try_module_get(afinfo->owner))
265        goto out;
266
267    mode->afinfo = afinfo;
268    modemap[mode->encap] = mode;
269    err = 0;
270
271out:
272    spin_unlock_bh(&xfrm_mode_lock);
273    xfrm_state_put_afinfo(afinfo);
274    return err;
275}
276EXPORT_SYMBOL(xfrm_register_mode);
277
278int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
279{
280    struct xfrm_state_afinfo *afinfo;
281    struct xfrm_mode **modemap;
282    int err;
283
284    if (unlikely(mode->encap >= XFRM_MODE_MAX))
285        return -EINVAL;
286
287    afinfo = xfrm_state_get_afinfo(family);
288    if (unlikely(afinfo == NULL))
289        return -EAFNOSUPPORT;
290
291    err = -ENOENT;
292    modemap = afinfo->mode_map;
293    spin_lock_bh(&xfrm_mode_lock);
294    if (likely(modemap[mode->encap] == mode)) {
295        modemap[mode->encap] = NULL;
296        module_put(mode->afinfo->owner);
297        err = 0;
298    }
299
300    spin_unlock_bh(&xfrm_mode_lock);
301    xfrm_state_put_afinfo(afinfo);
302    return err;
303}
304EXPORT_SYMBOL(xfrm_unregister_mode);
305
306static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
307{
308    struct xfrm_state_afinfo *afinfo;
309    struct xfrm_mode *mode;
310    int modload_attempted = 0;
311
312    if (unlikely(encap >= XFRM_MODE_MAX))
313        return NULL;
314
315retry:
316    afinfo = xfrm_state_get_afinfo(family);
317    if (unlikely(afinfo == NULL))
318        return NULL;
319
320    mode = afinfo->mode_map[encap];
321    if (unlikely(mode && !try_module_get(mode->owner)))
322        mode = NULL;
323    if (!mode && !modload_attempted) {
324        xfrm_state_put_afinfo(afinfo);
325        request_module("xfrm-mode-%d-%d", family, encap);
326        modload_attempted = 1;
327        goto retry;
328    }
329
330    xfrm_state_put_afinfo(afinfo);
331    return mode;
332}
333
334static void xfrm_put_mode(struct xfrm_mode *mode)
335{
336    module_put(mode->owner);
337}
338
339static void xfrm_state_gc_destroy(struct xfrm_state *x)
340{
341    tasklet_hrtimer_cancel(&x->mtimer);
342    del_timer_sync(&x->rtimer);
343    kfree(x->aalg);
344    kfree(x->ealg);
345    kfree(x->calg);
346    kfree(x->encap);
347    kfree(x->coaddr);
348    kfree(x->replay_esn);
349    kfree(x->preplay_esn);
350    if (x->inner_mode)
351        xfrm_put_mode(x->inner_mode);
352    if (x->inner_mode_iaf)
353        xfrm_put_mode(x->inner_mode_iaf);
354    if (x->outer_mode)
355        xfrm_put_mode(x->outer_mode);
356    if (x->type) {
357        x->type->destructor(x);
358        xfrm_put_type(x->type);
359    }
360    security_xfrm_state_free(x);
361    kfree(x);
362}
363
364static void xfrm_state_gc_task(struct work_struct *work)
365{
366    struct net *net = container_of(work, struct net, xfrm.state_gc_work);
367    struct xfrm_state *x;
368    struct hlist_node *tmp;
369    struct hlist_head gc_list;
370
371    spin_lock_bh(&xfrm_state_gc_lock);
372    hlist_move_list(&net->xfrm.state_gc_list, &gc_list);
373    spin_unlock_bh(&xfrm_state_gc_lock);
374
375    hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
376        xfrm_state_gc_destroy(x);
377
378    wake_up(&net->xfrm.km_waitq);
379}
380
381static inline unsigned long make_jiffies(long secs)
382{
383    if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
384        return MAX_SCHEDULE_TIMEOUT-1;
385    else
386        return secs*HZ;
387}
388
389static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me)
390{
391    struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
392    struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
393    struct net *net = xs_net(x);
394    unsigned long now = get_seconds();
395    long next = LONG_MAX;
396    int warn = 0;
397    int err = 0;
398
399    spin_lock(&x->lock);
400    if (x->km.state == XFRM_STATE_DEAD)
401        goto out;
402    if (x->km.state == XFRM_STATE_EXPIRED)
403        goto expired;
404    if (x->lft.hard_add_expires_seconds) {
405        long tmo = x->lft.hard_add_expires_seconds +
406            x->curlft.add_time - now;
407        if (tmo <= 0) {
408            if (x->xflags & XFRM_SOFT_EXPIRE) {
409                /* enter hard expire without soft expire first?!
410                 * setting a new date could trigger this.
411                 * workarbound: fix x->curflt.add_time by below:
412                 */
413                x->curlft.add_time = now - x->saved_tmo - 1;
414                tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
415            } else
416                goto expired;
417        }
418        if (tmo < next)
419            next = tmo;
420    }
421    if (x->lft.hard_use_expires_seconds) {
422        long tmo = x->lft.hard_use_expires_seconds +
423            (x->curlft.use_time ? : now) - now;
424        if (tmo <= 0)
425            goto expired;
426        if (tmo < next)
427            next = tmo;
428    }
429    if (x->km.dying)
430        goto resched;
431    if (x->lft.soft_add_expires_seconds) {
432        long tmo = x->lft.soft_add_expires_seconds +
433            x->curlft.add_time - now;
434        if (tmo <= 0) {
435            warn = 1;
436            x->xflags &= ~XFRM_SOFT_EXPIRE;
437        } else if (tmo < next) {
438            next = tmo;
439            x->xflags |= XFRM_SOFT_EXPIRE;
440            x->saved_tmo = tmo;
441        }
442    }
443    if (x->lft.soft_use_expires_seconds) {
444        long tmo = x->lft.soft_use_expires_seconds +
445            (x->curlft.use_time ? : now) - now;
446        if (tmo <= 0)
447            warn = 1;
448        else if (tmo < next)
449            next = tmo;
450    }
451
452    x->km.dying = warn;
453    if (warn)
454        km_state_expired(x, 0, 0);
455resched:
456    if (next != LONG_MAX){
457        tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
458    }
459
460    goto out;
461
462expired:
463    if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) {
464        x->km.state = XFRM_STATE_EXPIRED;
465        wake_up(&net->xfrm.km_waitq);
466        next = 2;
467        goto resched;
468    }
469
470    err = __xfrm_state_delete(x);
471    if (!err && x->id.spi)
472        km_state_expired(x, 1, 0);
473
474    xfrm_audit_state_delete(x, err ? 0 : 1,
475                audit_get_loginuid(current),
476                audit_get_sessionid(current), 0);
477
478out:
479    spin_unlock(&x->lock);
480    return HRTIMER_NORESTART;
481}
482
483static void xfrm_replay_timer_handler(unsigned long data);
484
485struct xfrm_state *xfrm_state_alloc(struct net *net)
486{
487    struct xfrm_state *x;
488
489    x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
490
491    if (x) {
492        write_pnet(&x->xs_net, net);
493        atomic_set(&x->refcnt, 1);
494        atomic_set(&x->tunnel_users, 0);
495        INIT_LIST_HEAD(&x->km.all);
496        INIT_HLIST_NODE(&x->bydst);
497        INIT_HLIST_NODE(&x->bysrc);
498        INIT_HLIST_NODE(&x->byspi);
499        tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler,
500                    CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
501        setup_timer(&x->rtimer, xfrm_replay_timer_handler,
502                (unsigned long)x);
503        x->curlft.add_time = get_seconds();
504        x->lft.soft_byte_limit = XFRM_INF;
505        x->lft.soft_packet_limit = XFRM_INF;
506        x->lft.hard_byte_limit = XFRM_INF;
507        x->lft.hard_packet_limit = XFRM_INF;
508        x->replay_maxage = 0;
509        x->replay_maxdiff = 0;
510        x->inner_mode = NULL;
511        x->inner_mode_iaf = NULL;
512        spin_lock_init(&x->lock);
513    }
514    return x;
515}
516EXPORT_SYMBOL(xfrm_state_alloc);
517
518void __xfrm_state_destroy(struct xfrm_state *x)
519{
520    struct net *net = xs_net(x);
521
522    WARN_ON(x->km.state != XFRM_STATE_DEAD);
523
524    spin_lock_bh(&xfrm_state_gc_lock);
525    hlist_add_head(&x->gclist, &net->xfrm.state_gc_list);
526    spin_unlock_bh(&xfrm_state_gc_lock);
527    schedule_work(&net->xfrm.state_gc_work);
528}
529EXPORT_SYMBOL(__xfrm_state_destroy);
530
531int __xfrm_state_delete(struct xfrm_state *x)
532{
533    struct net *net = xs_net(x);
534    int err = -ESRCH;
535
536    if (x->km.state != XFRM_STATE_DEAD) {
537        x->km.state = XFRM_STATE_DEAD;
538        spin_lock(&xfrm_state_lock);
539        list_del(&x->km.all);
540        hlist_del(&x->bydst);
541        hlist_del(&x->bysrc);
542        if (x->id.spi)
543            hlist_del(&x->byspi);
544        net->xfrm.state_num--;
545        spin_unlock(&xfrm_state_lock);
546
547        /* All xfrm_state objects are created by xfrm_state_alloc.
548         * The xfrm_state_alloc call gives a reference, and that
549         * is what we are dropping here.
550         */
551        xfrm_state_put(x);
552        err = 0;
553    }
554
555    return err;
556}
557EXPORT_SYMBOL(__xfrm_state_delete);
558
559int xfrm_state_delete(struct xfrm_state *x)
560{
561    int err;
562
563    spin_lock_bh(&x->lock);
564    err = __xfrm_state_delete(x);
565    spin_unlock_bh(&x->lock);
566
567    return err;
568}
569EXPORT_SYMBOL(xfrm_state_delete);
570
571#ifdef CONFIG_SECURITY_NETWORK_XFRM
572static inline int
573xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
574{
575    int i, err = 0;
576
577    for (i = 0; i <= net->xfrm.state_hmask; i++) {
578        struct xfrm_state *x;
579
580        hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
581            if (xfrm_id_proto_match(x->id.proto, proto) &&
582               (err = security_xfrm_state_delete(x)) != 0) {
583                xfrm_audit_state_delete(x, 0,
584                            audit_info->loginuid,
585                            audit_info->sessionid,
586                            audit_info->secid);
587                return err;
588            }
589        }
590    }
591
592    return err;
593}
594#else
595static inline int
596xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
597{
598    return 0;
599}
600#endif
601
602int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info)
603{
604    int i, err = 0, cnt = 0;
605
606    spin_lock_bh(&xfrm_state_lock);
607    err = xfrm_state_flush_secctx_check(net, proto, audit_info);
608    if (err)
609        goto out;
610
611    err = -ESRCH;
612    for (i = 0; i <= net->xfrm.state_hmask; i++) {
613        struct xfrm_state *x;
614restart:
615        hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
616            if (!xfrm_state_kern(x) &&
617                xfrm_id_proto_match(x->id.proto, proto)) {
618                xfrm_state_hold(x);
619                spin_unlock_bh(&xfrm_state_lock);
620
621                err = xfrm_state_delete(x);
622                xfrm_audit_state_delete(x, err ? 0 : 1,
623                            audit_info->loginuid,
624                            audit_info->sessionid,
625                            audit_info->secid);
626                xfrm_state_put(x);
627                if (!err)
628                    cnt++;
629
630                spin_lock_bh(&xfrm_state_lock);
631                goto restart;
632            }
633        }
634    }
635    if (cnt)
636        err = 0;
637
638out:
639    spin_unlock_bh(&xfrm_state_lock);
640    wake_up(&net->xfrm.km_waitq);
641    return err;
642}
643EXPORT_SYMBOL(xfrm_state_flush);
644
645void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
646{
647    spin_lock_bh(&xfrm_state_lock);
648    si->sadcnt = net->xfrm.state_num;
649    si->sadhcnt = net->xfrm.state_hmask;
650    si->sadhmcnt = xfrm_state_hashmax;
651    spin_unlock_bh(&xfrm_state_lock);
652}
653EXPORT_SYMBOL(xfrm_sad_getinfo);
654
655static int
656xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
657            const struct xfrm_tmpl *tmpl,
658            const xfrm_address_t *daddr, const xfrm_address_t *saddr,
659            unsigned short family)
660{
661    struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
662    if (!afinfo)
663        return -1;
664    afinfo->init_tempsel(&x->sel, fl);
665
666    if (family != tmpl->encap_family) {
667        xfrm_state_put_afinfo(afinfo);
668        afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
669        if (!afinfo)
670            return -1;
671    }
672    afinfo->init_temprop(x, tmpl, daddr, saddr);
673    xfrm_state_put_afinfo(afinfo);
674    return 0;
675}
676
677static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
678                          const xfrm_address_t *daddr,
679                          __be32 spi, u8 proto,
680                          unsigned short family)
681{
682    unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
683    struct xfrm_state *x;
684
685    hlist_for_each_entry(x, net->xfrm.state_byspi+h, byspi) {
686        if (x->props.family != family ||
687            x->id.spi != spi ||
688            x->id.proto != proto ||
689            !xfrm_addr_equal(&x->id.daddr, daddr, family))
690            continue;
691
692        if ((mark & x->mark.m) != x->mark.v)
693            continue;
694        xfrm_state_hold(x);
695        return x;
696    }
697
698    return NULL;
699}
700
701static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
702                             const xfrm_address_t *daddr,
703                             const xfrm_address_t *saddr,
704                             u8 proto, unsigned short family)
705{
706    unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
707    struct xfrm_state *x;
708
709    hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
710        if (x->props.family != family ||
711            x->id.proto != proto ||
712            !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
713            !xfrm_addr_equal(&x->props.saddr, saddr, family))
714            continue;
715
716        if ((mark & x->mark.m) != x->mark.v)
717            continue;
718        xfrm_state_hold(x);
719        return x;
720    }
721
722    return NULL;
723}
724
725static inline struct xfrm_state *
726__xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
727{
728    struct net *net = xs_net(x);
729    u32 mark = x->mark.v & x->mark.m;
730
731    if (use_spi)
732        return __xfrm_state_lookup(net, mark, &x->id.daddr,
733                       x->id.spi, x->id.proto, family);
734    else
735        return __xfrm_state_lookup_byaddr(net, mark,
736                          &x->id.daddr,
737                          &x->props.saddr,
738                          x->id.proto, family);
739}
740
741static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
742{
743    if (have_hash_collision &&
744        (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
745        net->xfrm.state_num > net->xfrm.state_hmask)
746        schedule_work(&net->xfrm.state_hash_work);
747}
748
749static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
750                   const struct flowi *fl, unsigned short family,
751                   struct xfrm_state **best, int *acq_in_progress,
752                   int *error)
753{
754    /* Resolution logic:
755     * 1. There is a valid state with matching selector. Done.
756     * 2. Valid state with inappropriate selector. Skip.
757     *
758     * Entering area of "sysdeps".
759     *
760     * 3. If state is not valid, selector is temporary, it selects
761     * only session which triggered previous resolution. Key
762     * manager will do something to install a state with proper
763     * selector.
764     */
765    if (x->km.state == XFRM_STATE_VALID) {
766        if ((x->sel.family &&
767             !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
768            !security_xfrm_state_pol_flow_match(x, pol, fl))
769            return;
770
771        if (!*best ||
772            (*best)->km.dying > x->km.dying ||
773            ((*best)->km.dying == x->km.dying &&
774             (*best)->curlft.add_time < x->curlft.add_time))
775            *best = x;
776    } else if (x->km.state == XFRM_STATE_ACQ) {
777        *acq_in_progress = 1;
778    } else if (x->km.state == XFRM_STATE_ERROR ||
779           x->km.state == XFRM_STATE_EXPIRED) {
780        if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
781            security_xfrm_state_pol_flow_match(x, pol, fl))
782            *error = -ESRCH;
783    }
784}
785
786struct xfrm_state *
787xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
788        const struct flowi *fl, struct xfrm_tmpl *tmpl,
789        struct xfrm_policy *pol, int *err,
790        unsigned short family)
791{
792    static xfrm_address_t saddr_wildcard = { };
793    struct net *net = xp_net(pol);
794    unsigned int h, h_wildcard;
795    struct xfrm_state *x, *x0, *to_put;
796    int acquire_in_progress = 0;
797    int error = 0;
798    struct xfrm_state *best = NULL;
799    u32 mark = pol->mark.v & pol->mark.m;
800    unsigned short encap_family = tmpl->encap_family;
801
802    to_put = NULL;
803
804    spin_lock_bh(&xfrm_state_lock);
805    h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
806    hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
807        if (x->props.family == encap_family &&
808            x->props.reqid == tmpl->reqid &&
809            (mark & x->mark.m) == x->mark.v &&
810            !(x->props.flags & XFRM_STATE_WILDRECV) &&
811            xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
812            tmpl->mode == x->props.mode &&
813            tmpl->id.proto == x->id.proto &&
814            (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
815            xfrm_state_look_at(pol, x, fl, encap_family,
816                       &best, &acquire_in_progress, &error);
817    }
818    if (best)
819        goto found;
820
821    h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
822    hlist_for_each_entry(x, net->xfrm.state_bydst+h_wildcard, bydst) {
823        if (x->props.family == encap_family &&
824            x->props.reqid == tmpl->reqid &&
825            (mark & x->mark.m) == x->mark.v &&
826            !(x->props.flags & XFRM_STATE_WILDRECV) &&
827            xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
828            tmpl->mode == x->props.mode &&
829            tmpl->id.proto == x->id.proto &&
830            (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
831            xfrm_state_look_at(pol, x, fl, encap_family,
832                       &best, &acquire_in_progress, &error);
833    }
834
835found:
836    x = best;
837    if (!x && !error && !acquire_in_progress) {
838        if (tmpl->id.spi &&
839            (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
840                          tmpl->id.proto, encap_family)) != NULL) {
841            to_put = x0;
842            error = -EEXIST;
843            goto out;
844        }
845        x = xfrm_state_alloc(net);
846        if (x == NULL) {
847            error = -ENOMEM;
848            goto out;
849        }
850        /* Initialize temporary state matching only
851         * to current session. */
852        xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
853        memcpy(&x->mark, &pol->mark, sizeof(x->mark));
854
855        error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
856        if (error) {
857            x->km.state = XFRM_STATE_DEAD;
858            to_put = x;
859            x = NULL;
860            goto out;
861        }
862
863        if (km_query(x, tmpl, pol) == 0) {
864            x->km.state = XFRM_STATE_ACQ;
865            list_add(&x->km.all, &net->xfrm.state_all);
866            hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
867            h = xfrm_src_hash(net, daddr, saddr, encap_family);
868            hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
869            if (x->id.spi) {
870                h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
871                hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
872            }
873            x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
874            tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
875            net->xfrm.state_num++;
876            xfrm_hash_grow_check(net, x->bydst.next != NULL);
877        } else {
878            x->km.state = XFRM_STATE_DEAD;
879            to_put = x;
880            x = NULL;
881            error = -ESRCH;
882        }
883    }
884out:
885    if (x)
886        xfrm_state_hold(x);
887    else
888        *err = acquire_in_progress ? -EAGAIN : error;
889    spin_unlock_bh(&xfrm_state_lock);
890    if (to_put)
891        xfrm_state_put(to_put);
892    return x;
893}
894
895struct xfrm_state *
896xfrm_stateonly_find(struct net *net, u32 mark,
897            xfrm_address_t *daddr, xfrm_address_t *saddr,
898            unsigned short family, u8 mode, u8 proto, u32 reqid)
899{
900    unsigned int h;
901    struct xfrm_state *rx = NULL, *x = NULL;
902
903    spin_lock(&xfrm_state_lock);
904    h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
905    hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
906        if (x->props.family == family &&
907            x->props.reqid == reqid &&
908            (mark & x->mark.m) == x->mark.v &&
909            !(x->props.flags & XFRM_STATE_WILDRECV) &&
910            xfrm_state_addr_check(x, daddr, saddr, family) &&
911            mode == x->props.mode &&
912            proto == x->id.proto &&
913            x->km.state == XFRM_STATE_VALID) {
914            rx = x;
915            break;
916        }
917    }
918
919    if (rx)
920        xfrm_state_hold(rx);
921    spin_unlock(&xfrm_state_lock);
922
923
924    return rx;
925}
926EXPORT_SYMBOL(xfrm_stateonly_find);
927
928static void __xfrm_state_insert(struct xfrm_state *x)
929{
930    struct net *net = xs_net(x);
931    unsigned int h;
932
933    list_add(&x->km.all, &net->xfrm.state_all);
934
935    h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
936              x->props.reqid, x->props.family);
937    hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
938
939    h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
940    hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
941
942    if (x->id.spi) {
943        h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
944                  x->props.family);
945
946        hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
947    }
948
949    tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
950    if (x->replay_maxage)
951        mod_timer(&x->rtimer, jiffies + x->replay_maxage);
952
953    wake_up(&net->xfrm.km_waitq);
954
955    net->xfrm.state_num++;
956
957    xfrm_hash_grow_check(net, x->bydst.next != NULL);
958}
959
960/* xfrm_state_lock is held */
961static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
962{
963    struct net *net = xs_net(xnew);
964    unsigned short family = xnew->props.family;
965    u32 reqid = xnew->props.reqid;
966    struct xfrm_state *x;
967    unsigned int h;
968    u32 mark = xnew->mark.v & xnew->mark.m;
969
970    h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
971    hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
972        if (x->props.family == family &&
973            x->props.reqid == reqid &&
974            (mark & x->mark.m) == x->mark.v &&
975            xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
976            xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
977            x->genid++;
978    }
979}
980
981void xfrm_state_insert(struct xfrm_state *x)
982{
983    spin_lock_bh(&xfrm_state_lock);
984    __xfrm_state_bump_genids(x);
985    __xfrm_state_insert(x);
986    spin_unlock_bh(&xfrm_state_lock);
987}
988EXPORT_SYMBOL(xfrm_state_insert);
989
990/* xfrm_state_lock is held */
991static struct xfrm_state *__find_acq_core(struct net *net,
992                      const struct xfrm_mark *m,
993                      unsigned short family, u8 mode,
994                      u32 reqid, u8 proto,
995                      const xfrm_address_t *daddr,
996                      const xfrm_address_t *saddr,
997                      int create)
998{
999    unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1000    struct xfrm_state *x;
1001    u32 mark = m->v & m->m;
1002
1003    hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1004        if (x->props.reqid != reqid ||
1005            x->props.mode != mode ||
1006            x->props.family != family ||
1007            x->km.state != XFRM_STATE_ACQ ||
1008            x->id.spi != 0 ||
1009            x->id.proto != proto ||
1010            (mark & x->mark.m) != x->mark.v ||
1011            !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1012            !xfrm_addr_equal(&x->props.saddr, saddr, family))
1013            continue;
1014
1015        xfrm_state_hold(x);
1016        return x;
1017    }
1018
1019    if (!create)
1020        return NULL;
1021
1022    x = xfrm_state_alloc(net);
1023    if (likely(x)) {
1024        switch (family) {
1025        case AF_INET:
1026            x->sel.daddr.a4 = daddr->a4;
1027            x->sel.saddr.a4 = saddr->a4;
1028            x->sel.prefixlen_d = 32;
1029            x->sel.prefixlen_s = 32;
1030            x->props.saddr.a4 = saddr->a4;
1031            x->id.daddr.a4 = daddr->a4;
1032            break;
1033
1034        case AF_INET6:
1035            *(struct in6_addr *)x->sel.daddr.a6 = *(struct in6_addr *)daddr;
1036            *(struct in6_addr *)x->sel.saddr.a6 = *(struct in6_addr *)saddr;
1037            x->sel.prefixlen_d = 128;
1038            x->sel.prefixlen_s = 128;
1039            *(struct in6_addr *)x->props.saddr.a6 = *(struct in6_addr *)saddr;
1040            *(struct in6_addr *)x->id.daddr.a6 = *(struct in6_addr *)daddr;
1041            break;
1042        }
1043
1044        x->km.state = XFRM_STATE_ACQ;
1045        x->id.proto = proto;
1046        x->props.family = family;
1047        x->props.mode = mode;
1048        x->props.reqid = reqid;
1049        x->mark.v = m->v;
1050        x->mark.m = m->m;
1051        x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1052        xfrm_state_hold(x);
1053        tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1054        list_add(&x->km.all, &net->xfrm.state_all);
1055        hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
1056        h = xfrm_src_hash(net, daddr, saddr, family);
1057        hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
1058
1059        net->xfrm.state_num++;
1060
1061        xfrm_hash_grow_check(net, x->bydst.next != NULL);
1062    }
1063
1064    return x;
1065}
1066
1067static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1068
1069int xfrm_state_add(struct xfrm_state *x)
1070{
1071    struct net *net = xs_net(x);
1072    struct xfrm_state *x1, *to_put;
1073    int family;
1074    int err;
1075    u32 mark = x->mark.v & x->mark.m;
1076    int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1077
1078    family = x->props.family;
1079
1080    to_put = NULL;
1081
1082    spin_lock_bh(&xfrm_state_lock);
1083
1084    x1 = __xfrm_state_locate(x, use_spi, family);
1085    if (x1) {
1086        to_put = x1;
1087        x1 = NULL;
1088        err = -EEXIST;
1089        goto out;
1090    }
1091
1092    if (use_spi && x->km.seq) {
1093        x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1094        if (x1 && ((x1->id.proto != x->id.proto) ||
1095            !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1096            to_put = x1;
1097            x1 = NULL;
1098        }
1099    }
1100
1101    if (use_spi && !x1)
1102        x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1103                     x->props.reqid, x->id.proto,
1104                     &x->id.daddr, &x->props.saddr, 0);
1105
1106    __xfrm_state_bump_genids(x);
1107    __xfrm_state_insert(x);
1108    err = 0;
1109
1110out:
1111    spin_unlock_bh(&xfrm_state_lock);
1112
1113    if (x1) {
1114        xfrm_state_delete(x1);
1115        xfrm_state_put(x1);
1116    }
1117
1118    if (to_put)
1119        xfrm_state_put(to_put);
1120
1121    return err;
1122}
1123EXPORT_SYMBOL(xfrm_state_add);
1124
1125#ifdef CONFIG_XFRM_MIGRATE
1126static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp)
1127{
1128    struct net *net = xs_net(orig);
1129    int err = -ENOMEM;
1130    struct xfrm_state *x = xfrm_state_alloc(net);
1131    if (!x)
1132        goto out;
1133
1134    memcpy(&x->id, &orig->id, sizeof(x->id));
1135    memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1136    memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1137    x->props.mode = orig->props.mode;
1138    x->props.replay_window = orig->props.replay_window;
1139    x->props.reqid = orig->props.reqid;
1140    x->props.family = orig->props.family;
1141    x->props.saddr = orig->props.saddr;
1142
1143    if (orig->aalg) {
1144        x->aalg = xfrm_algo_auth_clone(orig->aalg);
1145        if (!x->aalg)
1146            goto error;
1147    }
1148    x->props.aalgo = orig->props.aalgo;
1149
1150    if (orig->ealg) {
1151        x->ealg = xfrm_algo_clone(orig->ealg);
1152        if (!x->ealg)
1153            goto error;
1154    }
1155    x->props.ealgo = orig->props.ealgo;
1156
1157    if (orig->calg) {
1158        x->calg = xfrm_algo_clone(orig->calg);
1159        if (!x->calg)
1160            goto error;
1161    }
1162    x->props.calgo = orig->props.calgo;
1163
1164    if (orig->encap) {
1165        x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1166        if (!x->encap)
1167            goto error;
1168    }
1169
1170    if (orig->coaddr) {
1171        x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1172                    GFP_KERNEL);
1173        if (!x->coaddr)
1174            goto error;
1175    }
1176
1177    if (orig->replay_esn) {
1178        err = xfrm_replay_clone(x, orig);
1179        if (err)
1180            goto error;
1181    }
1182
1183    memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1184
1185    err = xfrm_init_state(x);
1186    if (err)
1187        goto error;
1188
1189    x->props.flags = orig->props.flags;
1190    x->props.extra_flags = orig->props.extra_flags;
1191
1192    x->curlft.add_time = orig->curlft.add_time;
1193    x->km.state = orig->km.state;
1194    x->km.seq = orig->km.seq;
1195
1196    return x;
1197
1198 error:
1199    xfrm_state_put(x);
1200out:
1201    if (errp)
1202        *errp = err;
1203    return NULL;
1204}
1205
1206/* xfrm_state_lock is held */
1207struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m)
1208{
1209    unsigned int h;
1210    struct xfrm_state *x;
1211
1212    if (m->reqid) {
1213        h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr,
1214                  m->reqid, m->old_family);
1215        hlist_for_each_entry(x, init_net.xfrm.state_bydst+h, bydst) {
1216            if (x->props.mode != m->mode ||
1217                x->id.proto != m->proto)
1218                continue;
1219            if (m->reqid && x->props.reqid != m->reqid)
1220                continue;
1221            if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1222                         m->old_family) ||
1223                !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1224                         m->old_family))
1225                continue;
1226            xfrm_state_hold(x);
1227            return x;
1228        }
1229    } else {
1230        h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr,
1231                  m->old_family);
1232        hlist_for_each_entry(x, init_net.xfrm.state_bysrc+h, bysrc) {
1233            if (x->props.mode != m->mode ||
1234                x->id.proto != m->proto)
1235                continue;
1236            if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1237                         m->old_family) ||
1238                !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1239                         m->old_family))
1240                continue;
1241            xfrm_state_hold(x);
1242            return x;
1243        }
1244    }
1245
1246    return NULL;
1247}
1248EXPORT_SYMBOL(xfrm_migrate_state_find);
1249
1250struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1251                       struct xfrm_migrate *m)
1252{
1253    struct xfrm_state *xc;
1254    int err;
1255
1256    xc = xfrm_state_clone(x, &err);
1257    if (!xc)
1258        return NULL;
1259
1260    memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1261    memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1262
1263    /* add state */
1264    if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1265        /* a care is needed when the destination address of the
1266           state is to be updated as it is a part of triplet */
1267        xfrm_state_insert(xc);
1268    } else {
1269        if ((err = xfrm_state_add(xc)) < 0)
1270            goto error;
1271    }
1272
1273    return xc;
1274error:
1275    xfrm_state_put(xc);
1276    return NULL;
1277}
1278EXPORT_SYMBOL(xfrm_state_migrate);
1279#endif
1280
1281int xfrm_state_update(struct xfrm_state *x)
1282{
1283    struct xfrm_state *x1, *to_put;
1284    int err;
1285    int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1286
1287    to_put = NULL;
1288
1289    spin_lock_bh(&xfrm_state_lock);
1290    x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1291
1292    err = -ESRCH;
1293    if (!x1)
1294        goto out;
1295
1296    if (xfrm_state_kern(x1)) {
1297        to_put = x1;
1298        err = -EEXIST;
1299        goto out;
1300    }
1301
1302    if (x1->km.state == XFRM_STATE_ACQ) {
1303        __xfrm_state_insert(x);
1304        x = NULL;
1305    }
1306    err = 0;
1307
1308out:
1309    spin_unlock_bh(&xfrm_state_lock);
1310
1311    if (to_put)
1312        xfrm_state_put(to_put);
1313
1314    if (err)
1315        return err;
1316
1317    if (!x) {
1318        xfrm_state_delete(x1);
1319        xfrm_state_put(x1);
1320        return 0;
1321    }
1322
1323    err = -EINVAL;
1324    spin_lock_bh(&x1->lock);
1325    if (likely(x1->km.state == XFRM_STATE_VALID)) {
1326        if (x->encap && x1->encap)
1327            memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1328        if (x->coaddr && x1->coaddr) {
1329            memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1330        }
1331        if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1332            memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1333        memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1334        x1->km.dying = 0;
1335
1336        tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1337        if (x1->curlft.use_time)
1338            xfrm_state_check_expire(x1);
1339
1340        err = 0;
1341        x->km.state = XFRM_STATE_DEAD;
1342        __xfrm_state_put(x);
1343    }
1344    spin_unlock_bh(&x1->lock);
1345
1346    xfrm_state_put(x1);
1347
1348    return err;
1349}
1350EXPORT_SYMBOL(xfrm_state_update);
1351
1352int xfrm_state_check_expire(struct xfrm_state *x)
1353{
1354    if (!x->curlft.use_time)
1355        x->curlft.use_time = get_seconds();
1356
1357    if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1358        x->curlft.packets >= x->lft.hard_packet_limit) {
1359        x->km.state = XFRM_STATE_EXPIRED;
1360        tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL);
1361        return -EINVAL;
1362    }
1363
1364    if (!x->km.dying &&
1365        (x->curlft.bytes >= x->lft.soft_byte_limit ||
1366         x->curlft.packets >= x->lft.soft_packet_limit)) {
1367        x->km.dying = 1;
1368        km_state_expired(x, 0, 0);
1369    }
1370    return 0;
1371}
1372EXPORT_SYMBOL(xfrm_state_check_expire);
1373
1374struct xfrm_state *
1375xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1376          u8 proto, unsigned short family)
1377{
1378    struct xfrm_state *x;
1379
1380    spin_lock_bh(&xfrm_state_lock);
1381    x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1382    spin_unlock_bh(&xfrm_state_lock);
1383    return x;
1384}
1385EXPORT_SYMBOL(xfrm_state_lookup);
1386
1387struct xfrm_state *
1388xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1389             const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1390             u8 proto, unsigned short family)
1391{
1392    struct xfrm_state *x;
1393
1394    spin_lock_bh(&xfrm_state_lock);
1395    x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1396    spin_unlock_bh(&xfrm_state_lock);
1397    return x;
1398}
1399EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1400
1401struct xfrm_state *
1402xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1403          u8 proto, const xfrm_address_t *daddr,
1404          const xfrm_address_t *saddr, int create, unsigned short family)
1405{
1406    struct xfrm_state *x;
1407
1408    spin_lock_bh(&xfrm_state_lock);
1409    x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1410    spin_unlock_bh(&xfrm_state_lock);
1411
1412    return x;
1413}
1414EXPORT_SYMBOL(xfrm_find_acq);
1415
1416#ifdef CONFIG_XFRM_SUB_POLICY
1417int
1418xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1419           unsigned short family)
1420{
1421    int err = 0;
1422    struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1423    if (!afinfo)
1424        return -EAFNOSUPPORT;
1425
1426    spin_lock_bh(&xfrm_state_lock);
1427    if (afinfo->tmpl_sort)
1428        err = afinfo->tmpl_sort(dst, src, n);
1429    spin_unlock_bh(&xfrm_state_lock);
1430    xfrm_state_put_afinfo(afinfo);
1431    return err;
1432}
1433EXPORT_SYMBOL(xfrm_tmpl_sort);
1434
1435int
1436xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1437        unsigned short family)
1438{
1439    int err = 0;
1440    struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1441    if (!afinfo)
1442        return -EAFNOSUPPORT;
1443
1444    spin_lock_bh(&xfrm_state_lock);
1445    if (afinfo->state_sort)
1446        err = afinfo->state_sort(dst, src, n);
1447    spin_unlock_bh(&xfrm_state_lock);
1448    xfrm_state_put_afinfo(afinfo);
1449    return err;
1450}
1451EXPORT_SYMBOL(xfrm_state_sort);
1452#endif
1453
1454/* Silly enough, but I'm lazy to build resolution list */
1455
1456static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1457{
1458    int i;
1459
1460    for (i = 0; i <= net->xfrm.state_hmask; i++) {
1461        struct xfrm_state *x;
1462
1463        hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1464            if (x->km.seq == seq &&
1465                (mark & x->mark.m) == x->mark.v &&
1466                x->km.state == XFRM_STATE_ACQ) {
1467                xfrm_state_hold(x);
1468                return x;
1469            }
1470        }
1471    }
1472    return NULL;
1473}
1474
1475struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1476{
1477    struct xfrm_state *x;
1478
1479    spin_lock_bh(&xfrm_state_lock);
1480    x = __xfrm_find_acq_byseq(net, mark, seq);
1481    spin_unlock_bh(&xfrm_state_lock);
1482    return x;
1483}
1484EXPORT_SYMBOL(xfrm_find_acq_byseq);
1485
1486u32 xfrm_get_acqseq(void)
1487{
1488    u32 res;
1489    static atomic_t acqseq;
1490
1491    do {
1492        res = atomic_inc_return(&acqseq);
1493    } while (!res);
1494
1495    return res;
1496}
1497EXPORT_SYMBOL(xfrm_get_acqseq);
1498
1499int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1500{
1501    struct net *net = xs_net(x);
1502    unsigned int h;
1503    struct xfrm_state *x0;
1504    int err = -ENOENT;
1505    __be32 minspi = htonl(low);
1506    __be32 maxspi = htonl(high);
1507    u32 mark = x->mark.v & x->mark.m;
1508
1509    spin_lock_bh(&x->lock);
1510    if (x->km.state == XFRM_STATE_DEAD)
1511        goto unlock;
1512
1513    err = 0;
1514    if (x->id.spi)
1515        goto unlock;
1516
1517    err = -ENOENT;
1518
1519    if (minspi == maxspi) {
1520        x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1521        if (x0) {
1522            xfrm_state_put(x0);
1523            goto unlock;
1524        }
1525        x->id.spi = minspi;
1526    } else {
1527        u32 spi = 0;
1528        for (h=0; h<high-low+1; h++) {
1529            spi = low + net_random()%(high-low+1);
1530            x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1531            if (x0 == NULL) {
1532                x->id.spi = htonl(spi);
1533                break;
1534            }
1535            xfrm_state_put(x0);
1536        }
1537    }
1538    if (x->id.spi) {
1539        spin_lock_bh(&xfrm_state_lock);
1540        h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1541        hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1542        spin_unlock_bh(&xfrm_state_lock);
1543
1544        err = 0;
1545    }
1546
1547unlock:
1548    spin_unlock_bh(&x->lock);
1549
1550    return err;
1551}
1552EXPORT_SYMBOL(xfrm_alloc_spi);
1553
1554int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1555            int (*func)(struct xfrm_state *, int, void*),
1556            void *data)
1557{
1558    struct xfrm_state *state;
1559    struct xfrm_state_walk *x;
1560    int err = 0;
1561
1562    if (walk->seq != 0 && list_empty(&walk->all))
1563        return 0;
1564
1565    spin_lock_bh(&xfrm_state_lock);
1566    if (list_empty(&walk->all))
1567        x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1568    else
1569        x = list_entry(&walk->all, struct xfrm_state_walk, all);
1570    list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1571        if (x->state == XFRM_STATE_DEAD)
1572            continue;
1573        state = container_of(x, struct xfrm_state, km);
1574        if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1575            continue;
1576        err = func(state, walk->seq, data);
1577        if (err) {
1578            list_move_tail(&walk->all, &x->all);
1579            goto out;
1580        }
1581        walk->seq++;
1582    }
1583    if (walk->seq == 0) {
1584        err = -ENOENT;
1585        goto out;
1586    }
1587    list_del_init(&walk->all);
1588out:
1589    spin_unlock_bh(&xfrm_state_lock);
1590    return err;
1591}
1592EXPORT_SYMBOL(xfrm_state_walk);
1593
1594void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1595{
1596    INIT_LIST_HEAD(&walk->all);
1597    walk->proto = proto;
1598    walk->state = XFRM_STATE_DEAD;
1599    walk->seq = 0;
1600}
1601EXPORT_SYMBOL(xfrm_state_walk_init);
1602
1603void xfrm_state_walk_done(struct xfrm_state_walk *walk)
1604{
1605    if (list_empty(&walk->all))
1606        return;
1607
1608    spin_lock_bh(&xfrm_state_lock);
1609    list_del(&walk->all);
1610    spin_unlock_bh(&xfrm_state_lock);
1611}
1612EXPORT_SYMBOL(xfrm_state_walk_done);
1613
1614static void xfrm_replay_timer_handler(unsigned long data)
1615{
1616    struct xfrm_state *x = (struct xfrm_state*)data;
1617
1618    spin_lock(&x->lock);
1619
1620    if (x->km.state == XFRM_STATE_VALID) {
1621        if (xfrm_aevent_is_on(xs_net(x)))
1622            x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1623        else
1624            x->xflags |= XFRM_TIME_DEFER;
1625    }
1626
1627    spin_unlock(&x->lock);
1628}
1629
1630static LIST_HEAD(xfrm_km_list);
1631
1632void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1633{
1634    struct xfrm_mgr *km;
1635
1636    rcu_read_lock();
1637    list_for_each_entry_rcu(km, &xfrm_km_list, list)
1638        if (km->notify_policy)
1639            km->notify_policy(xp, dir, c);
1640    rcu_read_unlock();
1641}
1642
1643void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1644{
1645    struct xfrm_mgr *km;
1646    rcu_read_lock();
1647    list_for_each_entry_rcu(km, &xfrm_km_list, list)
1648        if (km->notify)
1649            km->notify(x, c);
1650    rcu_read_unlock();
1651}
1652
1653EXPORT_SYMBOL(km_policy_notify);
1654EXPORT_SYMBOL(km_state_notify);
1655
1656void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
1657{
1658    struct net *net = xs_net(x);
1659    struct km_event c;
1660
1661    c.data.hard = hard;
1662    c.portid = portid;
1663    c.event = XFRM_MSG_EXPIRE;
1664    km_state_notify(x, &c);
1665
1666    if (hard)
1667        wake_up(&net->xfrm.km_waitq);
1668}
1669
1670EXPORT_SYMBOL(km_state_expired);
1671/*
1672 * We send to all registered managers regardless of failure
1673 * We are happy with one success
1674*/
1675int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1676{
1677    int err = -EINVAL, acqret;
1678    struct xfrm_mgr *km;
1679
1680    rcu_read_lock();
1681    list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1682        acqret = km->acquire(x, t, pol);
1683        if (!acqret)
1684            err = acqret;
1685    }
1686    rcu_read_unlock();
1687    return err;
1688}
1689EXPORT_SYMBOL(km_query);
1690
1691int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1692{
1693    int err = -EINVAL;
1694    struct xfrm_mgr *km;
1695
1696    rcu_read_lock();
1697    list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1698        if (km->new_mapping)
1699            err = km->new_mapping(x, ipaddr, sport);
1700        if (!err)
1701            break;
1702    }
1703    rcu_read_unlock();
1704    return err;
1705}
1706EXPORT_SYMBOL(km_new_mapping);
1707
1708void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1709{
1710    struct net *net = xp_net(pol);
1711    struct km_event c;
1712
1713    c.data.hard = hard;
1714    c.portid = portid;
1715    c.event = XFRM_MSG_POLEXPIRE;
1716    km_policy_notify(pol, dir, &c);
1717
1718    if (hard)
1719        wake_up(&net->xfrm.km_waitq);
1720}
1721EXPORT_SYMBOL(km_policy_expired);
1722
1723#ifdef CONFIG_XFRM_MIGRATE
1724int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1725           const struct xfrm_migrate *m, int num_migrate,
1726           const struct xfrm_kmaddress *k)
1727{
1728    int err = -EINVAL;
1729    int ret;
1730    struct xfrm_mgr *km;
1731
1732    rcu_read_lock();
1733    list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1734        if (km->migrate) {
1735            ret = km->migrate(sel, dir, type, m, num_migrate, k);
1736            if (!ret)
1737                err = ret;
1738        }
1739    }
1740    rcu_read_unlock();
1741    return err;
1742}
1743EXPORT_SYMBOL(km_migrate);
1744#endif
1745
1746int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1747{
1748    int err = -EINVAL;
1749    int ret;
1750    struct xfrm_mgr *km;
1751
1752    rcu_read_lock();
1753    list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1754        if (km->report) {
1755            ret = km->report(net, proto, sel, addr);
1756            if (!ret)
1757                err = ret;
1758        }
1759    }
1760    rcu_read_unlock();
1761    return err;
1762}
1763EXPORT_SYMBOL(km_report);
1764
1765int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1766{
1767    int err;
1768    u8 *data;
1769    struct xfrm_mgr *km;
1770    struct xfrm_policy *pol = NULL;
1771
1772    if (optlen <= 0 || optlen > PAGE_SIZE)
1773        return -EMSGSIZE;
1774
1775    data = kmalloc(optlen, GFP_KERNEL);
1776    if (!data)
1777        return -ENOMEM;
1778
1779    err = -EFAULT;
1780    if (copy_from_user(data, optval, optlen))
1781        goto out;
1782
1783    err = -EINVAL;
1784    rcu_read_lock();
1785    list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1786        pol = km->compile_policy(sk, optname, data,
1787                     optlen, &err);
1788        if (err >= 0)
1789            break;
1790    }
1791    rcu_read_unlock();
1792
1793    if (err >= 0) {
1794        xfrm_sk_policy_insert(sk, err, pol);
1795        xfrm_pol_put(pol);
1796        err = 0;
1797    }
1798
1799out:
1800    kfree(data);
1801    return err;
1802}
1803EXPORT_SYMBOL(xfrm_user_policy);
1804
1805static DEFINE_SPINLOCK(xfrm_km_lock);
1806
1807int xfrm_register_km(struct xfrm_mgr *km)
1808{
1809    spin_lock_bh(&xfrm_km_lock);
1810    list_add_tail_rcu(&km->list, &xfrm_km_list);
1811    spin_unlock_bh(&xfrm_km_lock);
1812    return 0;
1813}
1814EXPORT_SYMBOL(xfrm_register_km);
1815
1816int xfrm_unregister_km(struct xfrm_mgr *km)
1817{
1818    spin_lock_bh(&xfrm_km_lock);
1819    list_del_rcu(&km->list);
1820    spin_unlock_bh(&xfrm_km_lock);
1821    synchronize_rcu();
1822    return 0;
1823}
1824EXPORT_SYMBOL(xfrm_unregister_km);
1825
1826int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1827{
1828    int err = 0;
1829    if (unlikely(afinfo == NULL))
1830        return -EINVAL;
1831    if (unlikely(afinfo->family >= NPROTO))
1832        return -EAFNOSUPPORT;
1833    spin_lock_bh(&xfrm_state_afinfo_lock);
1834    if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1835        err = -ENOBUFS;
1836    else
1837        rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
1838    spin_unlock_bh(&xfrm_state_afinfo_lock);
1839    return err;
1840}
1841EXPORT_SYMBOL(xfrm_state_register_afinfo);
1842
1843int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1844{
1845    int err = 0;
1846    if (unlikely(afinfo == NULL))
1847        return -EINVAL;
1848    if (unlikely(afinfo->family >= NPROTO))
1849        return -EAFNOSUPPORT;
1850    spin_lock_bh(&xfrm_state_afinfo_lock);
1851    if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1852        if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1853            err = -EINVAL;
1854        else
1855            RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
1856    }
1857    spin_unlock_bh(&xfrm_state_afinfo_lock);
1858    synchronize_rcu();
1859    return err;
1860}
1861EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1862
1863struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1864{
1865    struct xfrm_state_afinfo *afinfo;
1866    if (unlikely(family >= NPROTO))
1867        return NULL;
1868    rcu_read_lock();
1869    afinfo = rcu_dereference(xfrm_state_afinfo[family]);
1870    if (unlikely(!afinfo))
1871        rcu_read_unlock();
1872    return afinfo;
1873}
1874
1875void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1876{
1877    rcu_read_unlock();
1878}
1879
1880/* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1881void xfrm_state_delete_tunnel(struct xfrm_state *x)
1882{
1883    if (x->tunnel) {
1884        struct xfrm_state *t = x->tunnel;
1885
1886        if (atomic_read(&t->tunnel_users) == 2)
1887            xfrm_state_delete(t);
1888        atomic_dec(&t->tunnel_users);
1889        xfrm_state_put(t);
1890        x->tunnel = NULL;
1891    }
1892}
1893EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1894
1895int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1896{
1897    int res;
1898
1899    spin_lock_bh(&x->lock);
1900    if (x->km.state == XFRM_STATE_VALID &&
1901        x->type && x->type->get_mtu)
1902        res = x->type->get_mtu(x, mtu);
1903    else
1904        res = mtu - x->props.header_len;
1905    spin_unlock_bh(&x->lock);
1906    return res;
1907}
1908
1909int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
1910{
1911    struct xfrm_state_afinfo *afinfo;
1912    struct xfrm_mode *inner_mode;
1913    int family = x->props.family;
1914    int err;
1915
1916    err = -EAFNOSUPPORT;
1917    afinfo = xfrm_state_get_afinfo(family);
1918    if (!afinfo)
1919        goto error;
1920
1921    err = 0;
1922    if (afinfo->init_flags)
1923        err = afinfo->init_flags(x);
1924
1925    xfrm_state_put_afinfo(afinfo);
1926
1927    if (err)
1928        goto error;
1929
1930    err = -EPROTONOSUPPORT;
1931
1932    if (x->sel.family != AF_UNSPEC) {
1933        inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
1934        if (inner_mode == NULL)
1935            goto error;
1936
1937        if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
1938            family != x->sel.family) {
1939            xfrm_put_mode(inner_mode);
1940            goto error;
1941        }
1942
1943        x->inner_mode = inner_mode;
1944    } else {
1945        struct xfrm_mode *inner_mode_iaf;
1946        int iafamily = AF_INET;
1947
1948        inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
1949        if (inner_mode == NULL)
1950            goto error;
1951
1952        if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
1953            xfrm_put_mode(inner_mode);
1954            goto error;
1955        }
1956        x->inner_mode = inner_mode;
1957
1958        if (x->props.family == AF_INET)
1959            iafamily = AF_INET6;
1960
1961        inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
1962        if (inner_mode_iaf) {
1963            if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
1964                x->inner_mode_iaf = inner_mode_iaf;
1965            else
1966                xfrm_put_mode(inner_mode_iaf);
1967        }
1968    }
1969
1970    x->type = xfrm_get_type(x->id.proto, family);
1971    if (x->type == NULL)
1972        goto error;
1973
1974    err = x->type->init_state(x);
1975    if (err)
1976        goto error;
1977
1978    x->outer_mode = xfrm_get_mode(x->props.mode, family);
1979    if (x->outer_mode == NULL) {
1980        err = -EPROTONOSUPPORT;
1981        goto error;
1982    }
1983
1984    if (init_replay) {
1985        err = xfrm_init_replay(x);
1986        if (err)
1987            goto error;
1988    }
1989
1990    x->km.state = XFRM_STATE_VALID;
1991
1992error:
1993    return err;
1994}
1995
1996EXPORT_SYMBOL(__xfrm_init_state);
1997
1998int xfrm_init_state(struct xfrm_state *x)
1999{
2000    return __xfrm_init_state(x, true);
2001}
2002
2003EXPORT_SYMBOL(xfrm_init_state);
2004
2005int __net_init xfrm_state_init(struct net *net)
2006{
2007    unsigned int sz;
2008
2009    INIT_LIST_HEAD(&net->xfrm.state_all);
2010
2011    sz = sizeof(struct hlist_head) * 8;
2012
2013    net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2014    if (!net->xfrm.state_bydst)
2015        goto out_bydst;
2016    net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2017    if (!net->xfrm.state_bysrc)
2018        goto out_bysrc;
2019    net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2020    if (!net->xfrm.state_byspi)
2021        goto out_byspi;
2022    net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2023
2024    net->xfrm.state_num = 0;
2025    INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2026    INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2027    INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2028    init_waitqueue_head(&net->xfrm.km_waitq);
2029    return 0;
2030
2031out_byspi:
2032    xfrm_hash_free(net->xfrm.state_bysrc, sz);
2033out_bysrc:
2034    xfrm_hash_free(net->xfrm.state_bydst, sz);
2035out_bydst:
2036    return -ENOMEM;
2037}
2038
2039void xfrm_state_fini(struct net *net)
2040{
2041    struct xfrm_audit audit_info;
2042    unsigned int sz;
2043
2044    flush_work(&net->xfrm.state_hash_work);
2045    audit_info.loginuid = INVALID_UID;
2046    audit_info.sessionid = -1;
2047    audit_info.secid = 0;
2048    xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info);
2049    flush_work(&net->xfrm.state_gc_work);
2050
2051    WARN_ON(!list_empty(&net->xfrm.state_all));
2052
2053    sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2054    WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2055    xfrm_hash_free(net->xfrm.state_byspi, sz);
2056    WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2057    xfrm_hash_free(net->xfrm.state_bysrc, sz);
2058    WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2059    xfrm_hash_free(net->xfrm.state_bydst, sz);
2060}
2061
2062#ifdef CONFIG_AUDITSYSCALL
2063static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2064                     struct audit_buffer *audit_buf)
2065{
2066    struct xfrm_sec_ctx *ctx = x->security;
2067    u32 spi = ntohl(x->id.spi);
2068
2069    if (ctx)
2070        audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2071                 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2072
2073    switch(x->props.family) {
2074    case AF_INET:
2075        audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2076                 &x->props.saddr.a4, &x->id.daddr.a4);
2077        break;
2078    case AF_INET6:
2079        audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2080                 x->props.saddr.a6, x->id.daddr.a6);
2081        break;
2082    }
2083
2084    audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2085}
2086
2087static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2088                      struct audit_buffer *audit_buf)
2089{
2090    const struct iphdr *iph4;
2091    const struct ipv6hdr *iph6;
2092
2093    switch (family) {
2094    case AF_INET:
2095        iph4 = ip_hdr(skb);
2096        audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2097                 &iph4->saddr, &iph4->daddr);
2098        break;
2099    case AF_INET6:
2100        iph6 = ipv6_hdr(skb);
2101        audit_log_format(audit_buf,
2102                 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2103                 &iph6->saddr,&iph6->daddr,
2104                 iph6->flow_lbl[0] & 0x0f,
2105                 iph6->flow_lbl[1],
2106                 iph6->flow_lbl[2]);
2107        break;
2108    }
2109}
2110
2111void xfrm_audit_state_add(struct xfrm_state *x, int result,
2112              kuid_t auid, u32 sessionid, u32 secid)
2113{
2114    struct audit_buffer *audit_buf;
2115
2116    audit_buf = xfrm_audit_start("SAD-add");
2117    if (audit_buf == NULL)
2118        return;
2119    xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2120    xfrm_audit_helper_sainfo(x, audit_buf);
2121    audit_log_format(audit_buf, " res=%u", result);
2122    audit_log_end(audit_buf);
2123}
2124EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2125
2126void xfrm_audit_state_delete(struct xfrm_state *x, int result,
2127                 kuid_t auid, u32 sessionid, u32 secid)
2128{
2129    struct audit_buffer *audit_buf;
2130
2131    audit_buf = xfrm_audit_start("SAD-delete");
2132    if (audit_buf == NULL)
2133        return;
2134    xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2135    xfrm_audit_helper_sainfo(x, audit_buf);
2136    audit_log_format(audit_buf, " res=%u", result);
2137    audit_log_end(audit_buf);
2138}
2139EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2140
2141void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2142                      struct sk_buff *skb)
2143{
2144    struct audit_buffer *audit_buf;
2145    u32 spi;
2146
2147    audit_buf = xfrm_audit_start("SA-replay-overflow");
2148    if (audit_buf == NULL)
2149        return;
2150    xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2151    /* don't record the sequence number because it's inherent in this kind
2152     * of audit message */
2153    spi = ntohl(x->id.spi);
2154    audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2155    audit_log_end(audit_buf);
2156}
2157EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2158
2159void xfrm_audit_state_replay(struct xfrm_state *x,
2160                 struct sk_buff *skb, __be32 net_seq)
2161{
2162    struct audit_buffer *audit_buf;
2163    u32 spi;
2164
2165    audit_buf = xfrm_audit_start("SA-replayed-pkt");
2166    if (audit_buf == NULL)
2167        return;
2168    xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2169    spi = ntohl(x->id.spi);
2170    audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2171             spi, spi, ntohl(net_seq));
2172    audit_log_end(audit_buf);
2173}
2174EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2175
2176void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2177{
2178    struct audit_buffer *audit_buf;
2179
2180    audit_buf = xfrm_audit_start("SA-notfound");
2181    if (audit_buf == NULL)
2182        return;
2183    xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2184    audit_log_end(audit_buf);
2185}
2186EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2187
2188void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2189                   __be32 net_spi, __be32 net_seq)
2190{
2191    struct audit_buffer *audit_buf;
2192    u32 spi;
2193
2194    audit_buf = xfrm_audit_start("SA-notfound");
2195    if (audit_buf == NULL)
2196        return;
2197    xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2198    spi = ntohl(net_spi);
2199    audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2200             spi, spi, ntohl(net_seq));
2201    audit_log_end(audit_buf);
2202}
2203EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2204
2205void xfrm_audit_state_icvfail(struct xfrm_state *x,
2206                  struct sk_buff *skb, u8 proto)
2207{
2208    struct audit_buffer *audit_buf;
2209    __be32 net_spi;
2210    __be32 net_seq;
2211
2212    audit_buf = xfrm_audit_start("SA-icv-failure");
2213    if (audit_buf == NULL)
2214        return;
2215    xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2216    if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2217        u32 spi = ntohl(net_spi);
2218        audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2219                 spi, spi, ntohl(net_seq));
2220    }
2221    audit_log_end(audit_buf);
2222}
2223EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2224#endif /* CONFIG_AUDITSYSCALL */
2225

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