diff options
Diffstat (limited to 'net/xfrm/xfrm_state.c')
| -rw-r--r-- | net/xfrm/xfrm_state.c | 2294 |
1 files changed, 2294 insertions, 0 deletions
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c new file mode 100644 index 000000000..96688cd0f --- /dev/null +++ b/net/xfrm/xfrm_state.c @@ -0,0 +1,2294 @@ +/* + * xfrm_state.c + * + * Changes: + * Mitsuru KANDA @USAGI + * Kazunori MIYAZAWA @USAGI + * Kunihiro Ishiguro <kunihiro@ipinfusion.com> + * IPv6 support + * YOSHIFUJI Hideaki @USAGI + * Split up af-specific functions + * Derek Atkins <derek@ihtfp.com> + * Add UDP Encapsulation + * + */ + +#include <linux/workqueue.h> +#include <net/xfrm.h> +#include <linux/pfkeyv2.h> +#include <linux/ipsec.h> +#include <linux/module.h> +#include <linux/cache.h> +#include <linux/audit.h> +#include <asm/uaccess.h> +#include <linux/ktime.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> + +#include "xfrm_hash.h" + +/* Each xfrm_state may be linked to two tables: + + 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) + 2. Hash table by (daddr,family,reqid) to find what SAs exist for given + destination/tunnel endpoint. (output) + */ + +static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; + +static inline unsigned int xfrm_dst_hash(struct net *net, + const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + u32 reqid, + unsigned short family) +{ + return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask); +} + +static inline unsigned int xfrm_src_hash(struct net *net, + const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + unsigned short family) +{ + return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask); +} + +static inline unsigned int +xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr, + __be32 spi, u8 proto, unsigned short family) +{ + return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask); +} + +static void xfrm_hash_transfer(struct hlist_head *list, + struct hlist_head *ndsttable, + struct hlist_head *nsrctable, + struct hlist_head *nspitable, + unsigned int nhashmask) +{ + struct hlist_node *tmp; + struct xfrm_state *x; + + hlist_for_each_entry_safe(x, tmp, list, bydst) { + unsigned int h; + + h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, + x->props.reqid, x->props.family, + nhashmask); + hlist_add_head(&x->bydst, ndsttable+h); + + h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, + x->props.family, + nhashmask); + hlist_add_head(&x->bysrc, nsrctable+h); + + if (x->id.spi) { + h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, + x->id.proto, x->props.family, + nhashmask); + hlist_add_head(&x->byspi, nspitable+h); + } + } +} + +static unsigned long xfrm_hash_new_size(unsigned int state_hmask) +{ + return ((state_hmask + 1) << 1) * sizeof(struct hlist_head); +} + +static void xfrm_hash_resize(struct work_struct *work) +{ + struct net *net = container_of(work, struct net, xfrm.state_hash_work); + struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; + unsigned long nsize, osize; + unsigned int nhashmask, ohashmask; + int i; + + nsize = xfrm_hash_new_size(net->xfrm.state_hmask); + ndst = xfrm_hash_alloc(nsize); + if (!ndst) + return; + nsrc = xfrm_hash_alloc(nsize); + if (!nsrc) { + xfrm_hash_free(ndst, nsize); + return; + } + nspi = xfrm_hash_alloc(nsize); + if (!nspi) { + xfrm_hash_free(ndst, nsize); + xfrm_hash_free(nsrc, nsize); + return; + } + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + + nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; + for (i = net->xfrm.state_hmask; i >= 0; i--) + xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi, + nhashmask); + + odst = net->xfrm.state_bydst; + osrc = net->xfrm.state_bysrc; + ospi = net->xfrm.state_byspi; + ohashmask = net->xfrm.state_hmask; + + net->xfrm.state_bydst = ndst; + net->xfrm.state_bysrc = nsrc; + net->xfrm.state_byspi = nspi; + net->xfrm.state_hmask = nhashmask; + + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + osize = (ohashmask + 1) * sizeof(struct hlist_head); + xfrm_hash_free(odst, osize); + xfrm_hash_free(osrc, osize); + xfrm_hash_free(ospi, osize); +} + +static DEFINE_SPINLOCK(xfrm_state_afinfo_lock); +static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO]; + +static DEFINE_SPINLOCK(xfrm_state_gc_lock); + +int __xfrm_state_delete(struct xfrm_state *x); + +int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); +bool km_is_alive(const struct km_event *c); +void km_state_expired(struct xfrm_state *x, int hard, u32 portid); + +static DEFINE_SPINLOCK(xfrm_type_lock); +int xfrm_register_type(const struct xfrm_type *type, unsigned short family) +{ + struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); + const struct xfrm_type **typemap; + int err = 0; + + if (unlikely(afinfo == NULL)) + return -EAFNOSUPPORT; + typemap = afinfo->type_map; + spin_lock_bh(&xfrm_type_lock); + + if (likely(typemap[type->proto] == NULL)) + typemap[type->proto] = type; + else + err = -EEXIST; + spin_unlock_bh(&xfrm_type_lock); + xfrm_state_put_afinfo(afinfo); + return err; +} +EXPORT_SYMBOL(xfrm_register_type); + +int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) +{ + struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); + const struct xfrm_type **typemap; + int err = 0; + + if (unlikely(afinfo == NULL)) + return -EAFNOSUPPORT; + typemap = afinfo->type_map; + spin_lock_bh(&xfrm_type_lock); + + if (unlikely(typemap[type->proto] != type)) + err = -ENOENT; + else + typemap[type->proto] = NULL; + spin_unlock_bh(&xfrm_type_lock); + xfrm_state_put_afinfo(afinfo); + return err; +} +EXPORT_SYMBOL(xfrm_unregister_type); + +static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) +{ + struct xfrm_state_afinfo *afinfo; + const struct xfrm_type **typemap; + const struct xfrm_type *type; + int modload_attempted = 0; + +retry: + afinfo = xfrm_state_get_afinfo(family); + if (unlikely(afinfo == NULL)) + return NULL; + typemap = afinfo->type_map; + + type = typemap[proto]; + if (unlikely(type && !try_module_get(type->owner))) + type = NULL; + if (!type && !modload_attempted) { + xfrm_state_put_afinfo(afinfo); + request_module("xfrm-type-%d-%d", family, proto); + modload_attempted = 1; + goto retry; + } + + xfrm_state_put_afinfo(afinfo); + return type; +} + +static void xfrm_put_type(const struct xfrm_type *type) +{ + module_put(type->owner); +} + +static DEFINE_SPINLOCK(xfrm_mode_lock); +int xfrm_register_mode(struct xfrm_mode *mode, int family) +{ + struct xfrm_state_afinfo *afinfo; + struct xfrm_mode **modemap; + int err; + + if (unlikely(mode->encap >= XFRM_MODE_MAX)) + return -EINVAL; + + afinfo = xfrm_state_get_afinfo(family); + if (unlikely(afinfo == NULL)) + return -EAFNOSUPPORT; + + err = -EEXIST; + modemap = afinfo->mode_map; + spin_lock_bh(&xfrm_mode_lock); + if (modemap[mode->encap]) + goto out; + + err = -ENOENT; + if (!try_module_get(afinfo->owner)) + goto out; + + mode->afinfo = afinfo; + modemap[mode->encap] = mode; + err = 0; + +out: + spin_unlock_bh(&xfrm_mode_lock); + xfrm_state_put_afinfo(afinfo); + return err; +} +EXPORT_SYMBOL(xfrm_register_mode); + +int xfrm_unregister_mode(struct xfrm_mode *mode, int family) +{ + struct xfrm_state_afinfo *afinfo; + struct xfrm_mode **modemap; + int err; + + if (unlikely(mode->encap >= XFRM_MODE_MAX)) + return -EINVAL; + + afinfo = xfrm_state_get_afinfo(family); + if (unlikely(afinfo == NULL)) + return -EAFNOSUPPORT; + + err = -ENOENT; + modemap = afinfo->mode_map; + spin_lock_bh(&xfrm_mode_lock); + if (likely(modemap[mode->encap] == mode)) { + modemap[mode->encap] = NULL; + module_put(mode->afinfo->owner); + err = 0; + } + + spin_unlock_bh(&xfrm_mode_lock); + xfrm_state_put_afinfo(afinfo); + return err; +} +EXPORT_SYMBOL(xfrm_unregister_mode); + +static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) +{ + struct xfrm_state_afinfo *afinfo; + struct xfrm_mode *mode; + int modload_attempted = 0; + + if (unlikely(encap >= XFRM_MODE_MAX)) + return NULL; + +retry: + afinfo = xfrm_state_get_afinfo(family); + if (unlikely(afinfo == NULL)) + return NULL; + + mode = afinfo->mode_map[encap]; + if (unlikely(mode && !try_module_get(mode->owner))) + mode = NULL; + if (!mode && !modload_attempted) { + xfrm_state_put_afinfo(afinfo); + request_module("xfrm-mode-%d-%d", family, encap); + modload_attempted = 1; + goto retry; + } + + xfrm_state_put_afinfo(afinfo); + return mode; +} + +static void xfrm_put_mode(struct xfrm_mode *mode) +{ + module_put(mode->owner); +} + +static void xfrm_state_gc_destroy(struct xfrm_state *x) +{ + tasklet_hrtimer_cancel(&x->mtimer); + del_timer_sync(&x->rtimer); + kfree(x->aalg); + kfree(x->ealg); + kfree(x->calg); + kfree(x->encap); + kfree(x->coaddr); + kfree(x->replay_esn); + kfree(x->preplay_esn); + if (x->inner_mode) + xfrm_put_mode(x->inner_mode); + if (x->inner_mode_iaf) + xfrm_put_mode(x->inner_mode_iaf); + if (x->outer_mode) + xfrm_put_mode(x->outer_mode); + if (x->type) { + x->type->destructor(x); + xfrm_put_type(x->type); + } + security_xfrm_state_free(x); + kfree(x); +} + +static void xfrm_state_gc_task(struct work_struct *work) +{ + struct net *net = container_of(work, struct net, xfrm.state_gc_work); + struct xfrm_state *x; + struct hlist_node *tmp; + struct hlist_head gc_list; + + spin_lock_bh(&xfrm_state_gc_lock); + hlist_move_list(&net->xfrm.state_gc_list, &gc_list); + spin_unlock_bh(&xfrm_state_gc_lock); + + hlist_for_each_entry_safe(x, tmp, &gc_list, gclist) + xfrm_state_gc_destroy(x); +} + +static inline unsigned long make_jiffies(long secs) +{ + if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) + return MAX_SCHEDULE_TIMEOUT-1; + else + return secs*HZ; +} + +static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me) +{ + struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer); + struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer); + unsigned long now = get_seconds(); + long next = LONG_MAX; + int warn = 0; + int err = 0; + + spin_lock(&x->lock); + if (x->km.state == XFRM_STATE_DEAD) + goto out; + if (x->km.state == XFRM_STATE_EXPIRED) + goto expired; + if (x->lft.hard_add_expires_seconds) { + long tmo = x->lft.hard_add_expires_seconds + + x->curlft.add_time - now; + if (tmo <= 0) { + if (x->xflags & XFRM_SOFT_EXPIRE) { + /* enter hard expire without soft expire first?! + * setting a new date could trigger this. + * workarbound: fix x->curflt.add_time by below: + */ + x->curlft.add_time = now - x->saved_tmo - 1; + tmo = x->lft.hard_add_expires_seconds - x->saved_tmo; + } else + goto expired; + } + if (tmo < next) + next = tmo; + } + if (x->lft.hard_use_expires_seconds) { + long tmo = x->lft.hard_use_expires_seconds + + (x->curlft.use_time ? : now) - now; + if (tmo <= 0) + goto expired; + if (tmo < next) + next = tmo; + } + if (x->km.dying) + goto resched; + if (x->lft.soft_add_expires_seconds) { + long tmo = x->lft.soft_add_expires_seconds + + x->curlft.add_time - now; + if (tmo <= 0) { + warn = 1; + x->xflags &= ~XFRM_SOFT_EXPIRE; + } else if (tmo < next) { + next = tmo; + x->xflags |= XFRM_SOFT_EXPIRE; + x->saved_tmo = tmo; + } + } + if (x->lft.soft_use_expires_seconds) { + long tmo = x->lft.soft_use_expires_seconds + + (x->curlft.use_time ? : now) - now; + if (tmo <= 0) + warn = 1; + else if (tmo < next) + next = tmo; + } + + x->km.dying = warn; + if (warn) + km_state_expired(x, 0, 0); +resched: + if (next != LONG_MAX) { + tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL); + } + + goto out; + +expired: + if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) + x->km.state = XFRM_STATE_EXPIRED; + + err = __xfrm_state_delete(x); + if (!err) + km_state_expired(x, 1, 0); + + xfrm_audit_state_delete(x, err ? 0 : 1, true); + +out: + spin_unlock(&x->lock); + return HRTIMER_NORESTART; +} + +static void xfrm_replay_timer_handler(unsigned long data); + +struct xfrm_state *xfrm_state_alloc(struct net *net) +{ + struct xfrm_state *x; + + x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); + + if (x) { + write_pnet(&x->xs_net, net); + atomic_set(&x->refcnt, 1); + atomic_set(&x->tunnel_users, 0); + INIT_LIST_HEAD(&x->km.all); + INIT_HLIST_NODE(&x->bydst); + INIT_HLIST_NODE(&x->bysrc); + INIT_HLIST_NODE(&x->byspi); + tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, + CLOCK_BOOTTIME, HRTIMER_MODE_ABS); + setup_timer(&x->rtimer, xfrm_replay_timer_handler, + (unsigned long)x); + x->curlft.add_time = get_seconds(); + x->lft.soft_byte_limit = XFRM_INF; + x->lft.soft_packet_limit = XFRM_INF; + x->lft.hard_byte_limit = XFRM_INF; + x->lft.hard_packet_limit = XFRM_INF; + x->replay_maxage = 0; + x->replay_maxdiff = 0; + x->inner_mode = NULL; + x->inner_mode_iaf = NULL; + spin_lock_init(&x->lock); + } + return x; +} +EXPORT_SYMBOL(xfrm_state_alloc); + +void __xfrm_state_destroy(struct xfrm_state *x) +{ + struct net *net = xs_net(x); + + WARN_ON(x->km.state != XFRM_STATE_DEAD); + + spin_lock_bh(&xfrm_state_gc_lock); + hlist_add_head(&x->gclist, &net->xfrm.state_gc_list); + spin_unlock_bh(&xfrm_state_gc_lock); + schedule_work(&net->xfrm.state_gc_work); +} +EXPORT_SYMBOL(__xfrm_state_destroy); + +int __xfrm_state_delete(struct xfrm_state *x) +{ + struct net *net = xs_net(x); + int err = -ESRCH; + + if (x->km.state != XFRM_STATE_DEAD) { + x->km.state = XFRM_STATE_DEAD; + spin_lock(&net->xfrm.xfrm_state_lock); + list_del(&x->km.all); + hlist_del(&x->bydst); + hlist_del(&x->bysrc); + if (x->id.spi) + hlist_del(&x->byspi); + net->xfrm.state_num--; + spin_unlock(&net->xfrm.xfrm_state_lock); + + /* All xfrm_state objects are created by xfrm_state_alloc. + * The xfrm_state_alloc call gives a reference, and that + * is what we are dropping here. + */ + xfrm_state_put(x); + err = 0; + } + + return err; +} +EXPORT_SYMBOL(__xfrm_state_delete); + +int xfrm_state_delete(struct xfrm_state *x) +{ + int err; + + spin_lock_bh(&x->lock); + err = __xfrm_state_delete(x); + spin_unlock_bh(&x->lock); + + return err; +} +EXPORT_SYMBOL(xfrm_state_delete); + +#ifdef CONFIG_SECURITY_NETWORK_XFRM +static inline int +xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) +{ + int i, err = 0; + + for (i = 0; i <= net->xfrm.state_hmask; i++) { + struct xfrm_state *x; + + hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { + if (xfrm_id_proto_match(x->id.proto, proto) && + (err = security_xfrm_state_delete(x)) != 0) { + xfrm_audit_state_delete(x, 0, task_valid); + return err; + } + } + } + + return err; +} +#else +static inline int +xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) +{ + return 0; +} +#endif + +int xfrm_state_flush(struct net *net, u8 proto, bool task_valid) +{ + int i, err = 0, cnt = 0; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + err = xfrm_state_flush_secctx_check(net, proto, task_valid); + if (err) + goto out; + + err = -ESRCH; + for (i = 0; i <= net->xfrm.state_hmask; i++) { + struct xfrm_state *x; +restart: + hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { + if (!xfrm_state_kern(x) && + xfrm_id_proto_match(x->id.proto, proto)) { + xfrm_state_hold(x); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + err = xfrm_state_delete(x); + xfrm_audit_state_delete(x, err ? 0 : 1, + task_valid); + xfrm_state_put(x); + if (!err) + cnt++; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + goto restart; + } + } + } + if (cnt) + err = 0; + +out: + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return err; +} +EXPORT_SYMBOL(xfrm_state_flush); + +void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si) +{ + spin_lock_bh(&net->xfrm.xfrm_state_lock); + si->sadcnt = net->xfrm.state_num; + si->sadhcnt = net->xfrm.state_hmask; + si->sadhmcnt = xfrm_state_hashmax; + spin_unlock_bh(&net->xfrm.xfrm_state_lock); +} +EXPORT_SYMBOL(xfrm_sad_getinfo); + +static int +xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl, + const struct xfrm_tmpl *tmpl, + const xfrm_address_t *daddr, const xfrm_address_t *saddr, + unsigned short family) +{ + struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); + if (!afinfo) + return -1; + afinfo->init_tempsel(&x->sel, fl); + + if (family != tmpl->encap_family) { + xfrm_state_put_afinfo(afinfo); + afinfo = xfrm_state_get_afinfo(tmpl->encap_family); + if (!afinfo) + return -1; + } + afinfo->init_temprop(x, tmpl, daddr, saddr); + xfrm_state_put_afinfo(afinfo); + return 0; +} + +static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark, + const xfrm_address_t *daddr, + __be32 spi, u8 proto, + unsigned short family) +{ + unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family); + struct xfrm_state *x; + + hlist_for_each_entry(x, net->xfrm.state_byspi+h, byspi) { + if (x->props.family != family || + x->id.spi != spi || + x->id.proto != proto || + !xfrm_addr_equal(&x->id.daddr, daddr, family)) + continue; + + if ((mark & x->mark.m) != x->mark.v) + continue; + xfrm_state_hold(x); + return x; + } + + return NULL; +} + +static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark, + const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + u8 proto, unsigned short family) +{ + unsigned int h = xfrm_src_hash(net, daddr, saddr, family); + struct xfrm_state *x; + + hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) { + if (x->props.family != family || + x->id.proto != proto || + !xfrm_addr_equal(&x->id.daddr, daddr, family) || + !xfrm_addr_equal(&x->props.saddr, saddr, family)) + continue; + + if ((mark & x->mark.m) != x->mark.v) + continue; + xfrm_state_hold(x); + return x; + } + + return NULL; +} + +static inline struct xfrm_state * +__xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) +{ + struct net *net = xs_net(x); + u32 mark = x->mark.v & x->mark.m; + + if (use_spi) + return __xfrm_state_lookup(net, mark, &x->id.daddr, + x->id.spi, x->id.proto, family); + else + return __xfrm_state_lookup_byaddr(net, mark, + &x->id.daddr, + &x->props.saddr, + x->id.proto, family); +} + +static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) +{ + if (have_hash_collision && + (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && + net->xfrm.state_num > net->xfrm.state_hmask) + schedule_work(&net->xfrm.state_hash_work); +} + +static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, + const struct flowi *fl, unsigned short family, + struct xfrm_state **best, int *acq_in_progress, + int *error) +{ + /* Resolution logic: + * 1. There is a valid state with matching selector. Done. + * 2. Valid state with inappropriate selector. Skip. + * + * Entering area of "sysdeps". + * + * 3. If state is not valid, selector is temporary, it selects + * only session which triggered previous resolution. Key + * manager will do something to install a state with proper + * selector. + */ + if (x->km.state == XFRM_STATE_VALID) { + if ((x->sel.family && + !xfrm_selector_match(&x->sel, fl, x->sel.family)) || + !security_xfrm_state_pol_flow_match(x, pol, fl)) + return; + + if (!*best || + (*best)->km.dying > x->km.dying || + ((*best)->km.dying == x->km.dying && + (*best)->curlft.add_time < x->curlft.add_time)) + *best = x; + } else if (x->km.state == XFRM_STATE_ACQ) { + *acq_in_progress = 1; + } else if (x->km.state == XFRM_STATE_ERROR || + x->km.state == XFRM_STATE_EXPIRED) { + if (xfrm_selector_match(&x->sel, fl, x->sel.family) && + security_xfrm_state_pol_flow_match(x, pol, fl)) + *error = -ESRCH; + } +} + +struct xfrm_state * +xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr, + const struct flowi *fl, struct xfrm_tmpl *tmpl, + struct xfrm_policy *pol, int *err, + unsigned short family) +{ + static xfrm_address_t saddr_wildcard = { }; + struct net *net = xp_net(pol); + unsigned int h, h_wildcard; + struct xfrm_state *x, *x0, *to_put; + int acquire_in_progress = 0; + int error = 0; + struct xfrm_state *best = NULL; + u32 mark = pol->mark.v & pol->mark.m; + unsigned short encap_family = tmpl->encap_family; + struct km_event c; + + to_put = NULL; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family); + hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { + if (x->props.family == encap_family && + x->props.reqid == tmpl->reqid && + (mark & x->mark.m) == x->mark.v && + !(x->props.flags & XFRM_STATE_WILDRECV) && + xfrm_state_addr_check(x, daddr, saddr, encap_family) && + tmpl->mode == x->props.mode && + tmpl->id.proto == x->id.proto && + (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) + xfrm_state_look_at(pol, x, fl, encap_family, + &best, &acquire_in_progress, &error); + } + if (best || acquire_in_progress) + goto found; + + h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family); + hlist_for_each_entry(x, net->xfrm.state_bydst+h_wildcard, bydst) { + if (x->props.family == encap_family && + x->props.reqid == tmpl->reqid && + (mark & x->mark.m) == x->mark.v && + !(x->props.flags & XFRM_STATE_WILDRECV) && + xfrm_addr_equal(&x->id.daddr, daddr, encap_family) && + tmpl->mode == x->props.mode && + tmpl->id.proto == x->id.proto && + (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) + xfrm_state_look_at(pol, x, fl, encap_family, + &best, &acquire_in_progress, &error); + } + +found: + x = best; + if (!x && !error && !acquire_in_progress) { + if (tmpl->id.spi && + (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi, + tmpl->id.proto, encap_family)) != NULL) { + to_put = x0; + error = -EEXIST; + goto out; + } + + c.net = net; + /* If the KMs have no listeners (yet...), avoid allocating an SA + * for each and every packet - garbage collection might not + * handle the flood. + */ + if (!km_is_alive(&c)) { + error = -ESRCH; + goto out; + } + + x = xfrm_state_alloc(net); + if (x == NULL) { + error = -ENOMEM; + goto out; + } + /* Initialize temporary state matching only + * to current session. */ + xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family); + memcpy(&x->mark, &pol->mark, sizeof(x->mark)); + + error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid); + if (error) { + x->km.state = XFRM_STATE_DEAD; + to_put = x; + x = NULL; + goto out; + } + + if (km_query(x, tmpl, pol) == 0) { + x->km.state = XFRM_STATE_ACQ; + list_add(&x->km.all, &net->xfrm.state_all); + hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); + h = xfrm_src_hash(net, daddr, saddr, encap_family); + hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); + if (x->id.spi) { + h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family); + hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); + } + x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; + tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); + net->xfrm.state_num++; + xfrm_hash_grow_check(net, x->bydst.next != NULL); + } else { + x->km.state = XFRM_STATE_DEAD; + to_put = x; + x = NULL; + error = -ESRCH; + } + } +out: + if (x) + xfrm_state_hold(x); + else + *err = acquire_in_progress ? -EAGAIN : error; + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + if (to_put) + xfrm_state_put(to_put); + return x; +} + +struct xfrm_state * +xfrm_stateonly_find(struct net *net, u32 mark, + xfrm_address_t *daddr, xfrm_address_t *saddr, + unsigned short family, u8 mode, u8 proto, u32 reqid) +{ + unsigned int h; + struct xfrm_state *rx = NULL, *x = NULL; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + h = xfrm_dst_hash(net, daddr, saddr, reqid, family); + hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { + if (x->props.family == family && + x->props.reqid == reqid && + (mark & x->mark.m) == x->mark.v && + !(x->props.flags & XFRM_STATE_WILDRECV) && + xfrm_state_addr_check(x, daddr, saddr, family) && + mode == x->props.mode && + proto == x->id.proto && + x->km.state == XFRM_STATE_VALID) { + rx = x; + break; + } + } + + if (rx) + xfrm_state_hold(rx); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + + return rx; +} +EXPORT_SYMBOL(xfrm_stateonly_find); + +struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, + unsigned short family) +{ + struct xfrm_state *x; + struct xfrm_state_walk *w; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + list_for_each_entry(w, &net->xfrm.state_all, all) { + x = container_of(w, struct xfrm_state, km); + if (x->props.family != family || + x->id.spi != spi) + continue; + + xfrm_state_hold(x); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return x; + } + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return NULL; +} +EXPORT_SYMBOL(xfrm_state_lookup_byspi); + +static void __xfrm_state_insert(struct xfrm_state *x) +{ + struct net *net = xs_net(x); + unsigned int h; + + list_add(&x->km.all, &net->xfrm.state_all); + + h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, + x->props.reqid, x->props.family); + hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); + + h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); + hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); + + if (x->id.spi) { + h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, + x->props.family); + + hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); + } + + tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); + if (x->replay_maxage) + mod_timer(&x->rtimer, jiffies + x->replay_maxage); + + net->xfrm.state_num++; + + xfrm_hash_grow_check(net, x->bydst.next != NULL); +} + +/* net->xfrm.xfrm_state_lock is held */ +static void __xfrm_state_bump_genids(struct xfrm_state *xnew) +{ + struct net *net = xs_net(xnew); + unsigned short family = xnew->props.family; + u32 reqid = xnew->props.reqid; + struct xfrm_state *x; + unsigned int h; + u32 mark = xnew->mark.v & xnew->mark.m; + + h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); + hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { + if (x->props.family == family && + x->props.reqid == reqid && + (mark & x->mark.m) == x->mark.v && + xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) && + xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family)) + x->genid++; + } +} + +void xfrm_state_insert(struct xfrm_state *x) +{ + struct net *net = xs_net(x); + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + __xfrm_state_bump_genids(x); + __xfrm_state_insert(x); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); +} +EXPORT_SYMBOL(xfrm_state_insert); + +/* net->xfrm.xfrm_state_lock is held */ +static struct xfrm_state *__find_acq_core(struct net *net, + const struct xfrm_mark *m, + unsigned short family, u8 mode, + u32 reqid, u8 proto, + const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + int create) +{ + unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); + struct xfrm_state *x; + u32 mark = m->v & m->m; + + hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { + if (x->props.reqid != reqid || + x->props.mode != mode || + x->props.family != family || + x->km.state != XFRM_STATE_ACQ || + x->id.spi != 0 || + x->id.proto != proto || + (mark & x->mark.m) != x->mark.v || + !xfrm_addr_equal(&x->id.daddr, daddr, family) || + !xfrm_addr_equal(&x->props.saddr, saddr, family)) + continue; + + xfrm_state_hold(x); + return x; + } + + if (!create) + return NULL; + + x = xfrm_state_alloc(net); + if (likely(x)) { + switch (family) { + case AF_INET: + x->sel.daddr.a4 = daddr->a4; + x->sel.saddr.a4 = saddr->a4; + x->sel.prefixlen_d = 32; + x->sel.prefixlen_s = 32; + x->props.saddr.a4 = saddr->a4; + x->id.daddr.a4 = daddr->a4; + break; + + case AF_INET6: + x->sel.daddr.in6 = daddr->in6; + x->sel.saddr.in6 = saddr->in6; + x->sel.prefixlen_d = 128; + x->sel.prefixlen_s = 128; + x->props.saddr.in6 = saddr->in6; + x->id.daddr.in6 = daddr->in6; + break; + } + + x->km.state = XFRM_STATE_ACQ; + x->id.proto = proto; + x->props.family = family; + x->props.mode = mode; + x->props.reqid = reqid; + x->mark.v = m->v; + x->mark.m = m->m; + x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; + xfrm_state_hold(x); + tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); + list_add(&x->km.all, &net->xfrm.state_all); + hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); + h = xfrm_src_hash(net, daddr, saddr, family); + hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); + + net->xfrm.state_num++; + + xfrm_hash_grow_check(net, x->bydst.next != NULL); + } + + return x; +} + +static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); + +int xfrm_state_add(struct xfrm_state *x) +{ + struct net *net = xs_net(x); + struct xfrm_state *x1, *to_put; + int family; + int err; + u32 mark = x->mark.v & x->mark.m; + int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); + + family = x->props.family; + + to_put = NULL; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + + x1 = __xfrm_state_locate(x, use_spi, family); + if (x1) { + to_put = x1; + x1 = NULL; + err = -EEXIST; + goto out; + } + + if (use_spi && x->km.seq) { + x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq); + if (x1 && ((x1->id.proto != x->id.proto) || + !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) { + to_put = x1; + x1 = NULL; + } + } + + if (use_spi && !x1) + x1 = __find_acq_core(net, &x->mark, family, x->props.mode, + x->props.reqid, x->id.proto, + &x->id.daddr, &x->props.saddr, 0); + + __xfrm_state_bump_genids(x); + __xfrm_state_insert(x); + err = 0; + +out: + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + if (x1) { + xfrm_state_delete(x1); + xfrm_state_put(x1); + } + + if (to_put) + xfrm_state_put(to_put); + + return err; +} +EXPORT_SYMBOL(xfrm_state_add); + +#ifdef CONFIG_XFRM_MIGRATE +static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig) +{ + struct net *net = xs_net(orig); + struct xfrm_state *x = xfrm_state_alloc(net); + if (!x) + goto out; + + memcpy(&x->id, &orig->id, sizeof(x->id)); + memcpy(&x->sel, &orig->sel, sizeof(x->sel)); + memcpy(&x->lft, &orig->lft, sizeof(x->lft)); + x->props.mode = orig->props.mode; + x->props.replay_window = orig->props.replay_window; + x->props.reqid = orig->props.reqid; + x->props.family = orig->props.family; + x->props.saddr = orig->props.saddr; + + if (orig->aalg) { + x->aalg = xfrm_algo_auth_clone(orig->aalg); + if (!x->aalg) + goto error; + } + x->props.aalgo = orig->props.aalgo; + + if (orig->aead) { + x->aead = xfrm_algo_aead_clone(orig->aead); + if (!x->aead) + goto error; + } + if (orig->ealg) { + x->ealg = xfrm_algo_clone(orig->ealg); + if (!x->ealg) + goto error; + } + x->props.ealgo = orig->props.ealgo; + + if (orig->calg) { + x->calg = xfrm_algo_clone(orig->calg); + if (!x->calg) + goto error; + } + x->props.calgo = orig->props.calgo; + + if (orig->encap) { + x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL); + if (!x->encap) + goto error; + } + + if (orig->coaddr) { + x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), + GFP_KERNEL); + if (!x->coaddr) + goto error; + } + + if (orig->replay_esn) { + if (xfrm_replay_clone(x, orig)) + goto error; + } + + memcpy(&x->mark, &orig->mark, sizeof(x->mark)); + + if (xfrm_init_state(x) < 0) + goto error; + + x->props.flags = orig->props.flags; + x->props.extra_flags = orig->props.extra_flags; + + x->tfcpad = orig->tfcpad; + x->replay_maxdiff = orig->replay_maxdiff; + x->replay_maxage = orig->replay_maxage; + x->curlft.add_time = orig->curlft.add_time; + x->km.state = orig->km.state; + x->km.seq = orig->km.seq; + + return x; + + error: + xfrm_state_put(x); +out: + return NULL; +} + +struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net) +{ + unsigned int h; + struct xfrm_state *x = NULL; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + + if (m->reqid) { + h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr, + m->reqid, m->old_family); + hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { + if (x->props.mode != m->mode || + x->id.proto != m->proto) + continue; + if (m->reqid && x->props.reqid != m->reqid) + continue; + if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, + m->old_family) || + !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, + m->old_family)) + continue; + xfrm_state_hold(x); + break; + } + } else { + h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr, + m->old_family); + hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) { + if (x->props.mode != m->mode || + x->id.proto != m->proto) + continue; + if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, + m->old_family) || + !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, + m->old_family)) + continue; + xfrm_state_hold(x); + break; + } + } + + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + return x; +} +EXPORT_SYMBOL(xfrm_migrate_state_find); + +struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, + struct xfrm_migrate *m) +{ + struct xfrm_state *xc; + + xc = xfrm_state_clone(x); + if (!xc) + return NULL; + + memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); + memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); + + /* add state */ + if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) { + /* a care is needed when the destination address of the + state is to be updated as it is a part of triplet */ + xfrm_state_insert(xc); + } else { + if (xfrm_state_add(xc) < 0) + goto error; + } + + return xc; +error: + xfrm_state_put(xc); + return NULL; +} +EXPORT_SYMBOL(xfrm_state_migrate); +#endif + +int xfrm_state_update(struct xfrm_state *x) +{ + struct xfrm_state *x1, *to_put; + int err; + int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); + struct net *net = xs_net(x); + + to_put = NULL; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + x1 = __xfrm_state_locate(x, use_spi, x->props.family); + + err = -ESRCH; + if (!x1) + goto out; + + if (xfrm_state_kern(x1)) { + to_put = x1; + err = -EEXIST; + goto out; + } + + if (x1->km.state == XFRM_STATE_ACQ) { + __xfrm_state_insert(x); + x = NULL; + } + err = 0; + +out: + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + if (to_put) + xfrm_state_put(to_put); + + if (err) + return err; + + if (!x) { + xfrm_state_delete(x1); + xfrm_state_put(x1); + return 0; + } + + err = -EINVAL; + spin_lock_bh(&x1->lock); + if (likely(x1->km.state == XFRM_STATE_VALID)) { + if (x->encap && x1->encap) + memcpy(x1->encap, x->encap, sizeof(*x1->encap)); + if (x->coaddr && x1->coaddr) { + memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); + } + if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) + memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); + memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); + x1->km.dying = 0; + + tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); + if (x1->curlft.use_time) + xfrm_state_check_expire(x1); + + err = 0; + x->km.state = XFRM_STATE_DEAD; + __xfrm_state_put(x); + } + spin_unlock_bh(&x1->lock); + + xfrm_state_put(x1); + + return err; +} +EXPORT_SYMBOL(xfrm_state_update); + +int xfrm_state_check_expire(struct xfrm_state *x) +{ + if (!x->curlft.use_time) + x->curlft.use_time = get_seconds(); + + if (x->curlft.bytes >= x->lft.hard_byte_limit || + x->curlft.packets >= x->lft.hard_packet_limit) { + x->km.state = XFRM_STATE_EXPIRED; + tasklet_hrtimer_start(&x->mtimer, ktime_set(0, 0), HRTIMER_MODE_REL); + return -EINVAL; + } + + if (!x->km.dying && + (x->curlft.bytes >= x->lft.soft_byte_limit || + x->curlft.packets >= x->lft.soft_packet_limit)) { + x->km.dying = 1; + km_state_expired(x, 0, 0); + } + return 0; +} +EXPORT_SYMBOL(xfrm_state_check_expire); + +struct xfrm_state * +xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi, + u8 proto, unsigned short family) +{ + struct xfrm_state *x; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return x; +} +EXPORT_SYMBOL(xfrm_state_lookup); + +struct xfrm_state * +xfrm_state_lookup_byaddr(struct net *net, u32 mark, + const xfrm_address_t *daddr, const xfrm_address_t *saddr, + u8 proto, unsigned short family) +{ + struct xfrm_state *x; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return x; +} +EXPORT_SYMBOL(xfrm_state_lookup_byaddr); + +struct xfrm_state * +xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid, + u8 proto, const xfrm_address_t *daddr, + const xfrm_address_t *saddr, int create, unsigned short family) +{ + struct xfrm_state *x; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + return x; +} +EXPORT_SYMBOL(xfrm_find_acq); + +#ifdef CONFIG_XFRM_SUB_POLICY +int +xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, + unsigned short family, struct net *net) +{ + int err = 0; + struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); + if (!afinfo) + return -EAFNOSUPPORT; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/ + if (afinfo->tmpl_sort) + err = afinfo->tmpl_sort(dst, src, n); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + xfrm_state_put_afinfo(afinfo); + return err; +} +EXPORT_SYMBOL(xfrm_tmpl_sort); + +int +xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, + unsigned short family) +{ + int err = 0; + struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); + struct net *net = xs_net(*src); + + if (!afinfo) + return -EAFNOSUPPORT; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + if (afinfo->state_sort) + err = afinfo->state_sort(dst, src, n); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + xfrm_state_put_afinfo(afinfo); + return err; +} +EXPORT_SYMBOL(xfrm_state_sort); +#endif + +/* Silly enough, but I'm lazy to build resolution list */ + +static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) +{ + int i; + + for (i = 0; i <= net->xfrm.state_hmask; i++) { + struct xfrm_state *x; + + hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { + if (x->km.seq == seq && + (mark & x->mark.m) == x->mark.v && + x->km.state == XFRM_STATE_ACQ) { + xfrm_state_hold(x); + return x; + } + } + } + return NULL; +} + +struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) +{ + struct xfrm_state *x; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + x = __xfrm_find_acq_byseq(net, mark, seq); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return x; +} +EXPORT_SYMBOL(xfrm_find_acq_byseq); + +u32 xfrm_get_acqseq(void) +{ + u32 res; + static atomic_t acqseq; + + do { + res = atomic_inc_return(&acqseq); + } while (!res); + + return res; +} +EXPORT_SYMBOL(xfrm_get_acqseq); + +int verify_spi_info(u8 proto, u32 min, u32 max) +{ + switch (proto) { + case IPPROTO_AH: + case IPPROTO_ESP: + break; + + case IPPROTO_COMP: + /* IPCOMP spi is 16-bits. */ + if (max >= 0x10000) + return -EINVAL; + break; + + default: + return -EINVAL; + } + + if (min > max) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL(verify_spi_info); + +int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) +{ + struct net *net = xs_net(x); + unsigned int h; + struct xfrm_state *x0; + int err = -ENOENT; + __be32 minspi = htonl(low); + __be32 maxspi = htonl(high); + u32 mark = x->mark.v & x->mark.m; + + spin_lock_bh(&x->lock); + if (x->km.state == XFRM_STATE_DEAD) + goto unlock; + + err = 0; + if (x->id.spi) + goto unlock; + + err = -ENOENT; + + if (minspi == maxspi) { + x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family); + if (x0) { + xfrm_state_put(x0); + goto unlock; + } + x->id.spi = minspi; + } else { + u32 spi = 0; + for (h = 0; h < high-low+1; h++) { + spi = low + prandom_u32()%(high-low+1); + x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); + if (x0 == NULL) { + x->id.spi = htonl(spi); + break; + } + xfrm_state_put(x0); + } + } + if (x->id.spi) { + spin_lock_bh(&net->xfrm.xfrm_state_lock); + h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); + hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + err = 0; + } + +unlock: + spin_unlock_bh(&x->lock); + + return err; +} +EXPORT_SYMBOL(xfrm_alloc_spi); + +static bool __xfrm_state_filter_match(struct xfrm_state *x, + struct xfrm_address_filter *filter) +{ + if (filter) { + if ((filter->family == AF_INET || + filter->family == AF_INET6) && + x->props.family != filter->family) + return false; + + return addr_match(&x->props.saddr, &filter->saddr, + filter->splen) && + addr_match(&x->id.daddr, &filter->daddr, + filter->dplen); + } + return true; +} + +int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, + int (*func)(struct xfrm_state *, int, void*), + void *data) +{ + struct xfrm_state *state; + struct xfrm_state_walk *x; + int err = 0; + + if (walk->seq != 0 && list_empty(&walk->all)) + return 0; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + if (list_empty(&walk->all)) + x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); + else + x = list_entry(&walk->all, struct xfrm_state_walk, all); + list_for_each_entry_from(x, &net->xfrm.state_all, all) { + if (x->state == XFRM_STATE_DEAD) + continue; + state = container_of(x, struct xfrm_state, km); + if (!xfrm_id_proto_match(state->id.proto, walk->proto)) + continue; + if (!__xfrm_state_filter_match(state, walk->filter)) + continue; + err = func(state, walk->seq, data); + if (err) { + list_move_tail(&walk->all, &x->all); + goto out; + } + walk->seq++; + } + if (walk->seq == 0) { + err = -ENOENT; + goto out; + } + list_del_init(&walk->all); +out: + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return err; +} +EXPORT_SYMBOL(xfrm_state_walk); + +void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, + struct xfrm_address_filter *filter) +{ + INIT_LIST_HEAD(&walk->all); + walk->proto = proto; + walk->state = XFRM_STATE_DEAD; + walk->seq = 0; + walk->filter = filter; +} +EXPORT_SYMBOL(xfrm_state_walk_init); + +void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net) +{ + kfree(walk->filter); + + if (list_empty(&walk->all)) + return; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + list_del(&walk->all); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); +} +EXPORT_SYMBOL(xfrm_state_walk_done); + +static void xfrm_replay_timer_handler(unsigned long data) +{ + struct xfrm_state *x = (struct xfrm_state *)data; + + spin_lock(&x->lock); + + if (x->km.state == XFRM_STATE_VALID) { + if (xfrm_aevent_is_on(xs_net(x))) + x->repl->notify(x, XFRM_REPLAY_TIMEOUT); + else + x->xflags |= XFRM_TIME_DEFER; + } + + spin_unlock(&x->lock); +} + +static LIST_HEAD(xfrm_km_list); + +void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) +{ + struct xfrm_mgr *km; + + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) + if (km->notify_policy) + km->notify_policy(xp, dir, c); + rcu_read_unlock(); +} + +void km_state_notify(struct xfrm_state *x, const struct km_event *c) +{ + struct xfrm_mgr *km; + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) + if (km->notify) + km->notify(x, c); + rcu_read_unlock(); +} + +EXPORT_SYMBOL(km_policy_notify); +EXPORT_SYMBOL(km_state_notify); + +void km_state_expired(struct xfrm_state *x, int hard, u32 portid) +{ + struct km_event c; + + c.data.hard = hard; + c.portid = portid; + c.event = XFRM_MSG_EXPIRE; + km_state_notify(x, &c); +} + +EXPORT_SYMBOL(km_state_expired); +/* + * We send to all registered managers regardless of failure + * We are happy with one success +*/ +int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) +{ + int err = -EINVAL, acqret; + struct xfrm_mgr *km; + + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) { + acqret = km->acquire(x, t, pol); + if (!acqret) + err = acqret; + } + rcu_read_unlock(); + return err; +} +EXPORT_SYMBOL(km_query); + +int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) +{ + int err = -EINVAL; + struct xfrm_mgr *km; + + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) { + if (km->new_mapping) + err = km->new_mapping(x, ipaddr, sport); + if (!err) + break; + } + rcu_read_unlock(); + return err; +} +EXPORT_SYMBOL(km_new_mapping); + +void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid) +{ + struct km_event c; + + c.data.hard = hard; + c.portid = portid; + c.event = XFRM_MSG_POLEXPIRE; + km_policy_notify(pol, dir, &c); +} +EXPORT_SYMBOL(km_policy_expired); + +#ifdef CONFIG_XFRM_MIGRATE +int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, + const struct xfrm_migrate *m, int num_migrate, + const struct xfrm_kmaddress *k) +{ + int err = -EINVAL; + int ret; + struct xfrm_mgr *km; + + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) { + if (km->migrate) { + ret = km->migrate(sel, dir, type, m, num_migrate, k); + if (!ret) + err = ret; + } + } + rcu_read_unlock(); + return err; +} +EXPORT_SYMBOL(km_migrate); +#endif + +int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) +{ + int err = -EINVAL; + int ret; + struct xfrm_mgr *km; + + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) { + if (km->report) { + ret = km->report(net, proto, sel, addr); + if (!ret) + err = ret; + } + } + rcu_read_unlock(); + return err; +} +EXPORT_SYMBOL(km_report); + +bool km_is_alive(const struct km_event *c) +{ + struct xfrm_mgr *km; + bool is_alive = false; + + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) { + if (km->is_alive && km->is_alive(c)) { + is_alive = true; + break; + } + } + rcu_read_unlock(); + + return is_alive; +} +EXPORT_SYMBOL(km_is_alive); + +int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) +{ + int err; + u8 *data; + struct xfrm_mgr *km; + struct xfrm_policy *pol = NULL; + + if (optlen <= 0 || optlen > PAGE_SIZE) + return -EMSGSIZE; + + data = kmalloc(optlen, GFP_KERNEL); + if (!data) + return -ENOMEM; + + err = -EFAULT; + if (copy_from_user(data, optval, optlen)) + goto out; + + err = -EINVAL; + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) { + pol = km->compile_policy(sk, optname, data, + optlen, &err); + if (err >= 0) + break; + } + rcu_read_unlock(); + + if (err >= 0) { + xfrm_sk_policy_insert(sk, err, pol); + xfrm_pol_put(pol); + err = 0; + } + +out: + kfree(data); + return err; +} +EXPORT_SYMBOL(xfrm_user_policy); + +static DEFINE_SPINLOCK(xfrm_km_lock); + +int xfrm_register_km(struct xfrm_mgr *km) +{ + spin_lock_bh(&xfrm_km_lock); + list_add_tail_rcu(&km->list, &xfrm_km_list); + spin_unlock_bh(&xfrm_km_lock); + return 0; +} +EXPORT_SYMBOL(xfrm_register_km); + +int xfrm_unregister_km(struct xfrm_mgr *km) +{ + spin_lock_bh(&xfrm_km_lock); + list_del_rcu(&km->list); + spin_unlock_bh(&xfrm_km_lock); + synchronize_rcu(); + return 0; +} +EXPORT_SYMBOL(xfrm_unregister_km); + +int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) +{ + int err = 0; + if (unlikely(afinfo == NULL)) + return -EINVAL; + if (unlikely(afinfo->family >= NPROTO)) + return -EAFNOSUPPORT; + spin_lock_bh(&xfrm_state_afinfo_lock); + if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) + err = -ENOBUFS; + else + rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo); + spin_unlock_bh(&xfrm_state_afinfo_lock); + return err; +} +EXPORT_SYMBOL(xfrm_state_register_afinfo); + +int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) +{ + int err = 0; + if (unlikely(afinfo == NULL)) + return -EINVAL; + if (unlikely(afinfo->family >= NPROTO)) + return -EAFNOSUPPORT; + spin_lock_bh(&xfrm_state_afinfo_lock); + if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { + if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) + err = -EINVAL; + else + RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL); + } + spin_unlock_bh(&xfrm_state_afinfo_lock); + synchronize_rcu(); + return err; +} +EXPORT_SYMBOL(xfrm_state_unregister_afinfo); + +struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) +{ + struct xfrm_state_afinfo *afinfo; + if (unlikely(family >= NPROTO)) + return NULL; + rcu_read_lock(); + afinfo = rcu_dereference(xfrm_state_afinfo[family]); + if (unlikely(!afinfo)) + rcu_read_unlock(); + return afinfo; +} + +void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) +{ + rcu_read_unlock(); +} + +/* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ +void xfrm_state_delete_tunnel(struct xfrm_state *x) +{ + if (x->tunnel) { + struct xfrm_state *t = x->tunnel; + + if (atomic_read(&t->tunnel_users) == 2) + xfrm_state_delete(t); + atomic_dec(&t->tunnel_users); + xfrm_state_put(t); + x->tunnel = NULL; + } +} +EXPORT_SYMBOL(xfrm_state_delete_tunnel); + +int xfrm_state_mtu(struct xfrm_state *x, int mtu) +{ + int res; + + spin_lock_bh(&x->lock); + if (x->km.state == XFRM_STATE_VALID && + x->type && x->type->get_mtu) + res = x->type->get_mtu(x, mtu); + else + res = mtu - x->props.header_len; + spin_unlock_bh(&x->lock); + return res; +} + +int __xfrm_init_state(struct xfrm_state *x, bool init_replay) +{ + struct xfrm_state_afinfo *afinfo; + struct xfrm_mode *inner_mode; + int family = x->props.family; + int err; + + err = -EAFNOSUPPORT; + afinfo = xfrm_state_get_afinfo(family); + if (!afinfo) + goto error; + + err = 0; + if (afinfo->init_flags) + err = afinfo->init_flags(x); + + xfrm_state_put_afinfo(afinfo); + + if (err) + goto error; + + err = -EPROTONOSUPPORT; + + if (x->sel.family != AF_UNSPEC) { + inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); + if (inner_mode == NULL) + goto error; + + if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && + family != x->sel.family) { + xfrm_put_mode(inner_mode); + goto error; + } + + x->inner_mode = inner_mode; + } else { + struct xfrm_mode *inner_mode_iaf; + int iafamily = AF_INET; + + inner_mode = xfrm_get_mode(x->props.mode, x->props.family); + if (inner_mode == NULL) + goto error; + + if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { + xfrm_put_mode(inner_mode); + goto error; + } + x->inner_mode = inner_mode; + + if (x->props.family == AF_INET) + iafamily = AF_INET6; + + inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); + if (inner_mode_iaf) { + if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) + x->inner_mode_iaf = inner_mode_iaf; + else + xfrm_put_mode(inner_mode_iaf); + } + } + + x->type = xfrm_get_type(x->id.proto, family); + if (x->type == NULL) + goto error; + + err = x->type->init_state(x); + if (err) + goto error; + + x->outer_mode = xfrm_get_mode(x->props.mode, family); + if (x->outer_mode == NULL) { + err = -EPROTONOSUPPORT; + goto error; + } + + if (init_replay) { + err = xfrm_init_replay(x); + if (err) + goto error; + } + + x->km.state = XFRM_STATE_VALID; + +error: + return err; +} + +EXPORT_SYMBOL(__xfrm_init_state); + +int xfrm_init_state(struct xfrm_state *x) +{ + return __xfrm_init_state(x, true); +} + +EXPORT_SYMBOL(xfrm_init_state); + +int __net_init xfrm_state_init(struct net *net) +{ + unsigned int sz; + + INIT_LIST_HEAD(&net->xfrm.state_all); + + sz = sizeof(struct hlist_head) * 8; + + net->xfrm.state_bydst = xfrm_hash_alloc(sz); + if (!net->xfrm.state_bydst) + goto out_bydst; + net->xfrm.state_bysrc = xfrm_hash_alloc(sz); + if (!net->xfrm.state_bysrc) + goto out_bysrc; + net->xfrm.state_byspi = xfrm_hash_alloc(sz); + if (!net->xfrm.state_byspi) + goto out_byspi; + net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); + + net->xfrm.state_num = 0; + INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); + INIT_HLIST_HEAD(&net->xfrm.state_gc_list); + INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task); + spin_lock_init(&net->xfrm.xfrm_state_lock); + return 0; + +out_byspi: + xfrm_hash_free(net->xfrm.state_bysrc, sz); +out_bysrc: + xfrm_hash_free(net->xfrm.state_bydst, sz); +out_bydst: + return -ENOMEM; +} + +void xfrm_state_fini(struct net *net) +{ + unsigned int sz; + + flush_work(&net->xfrm.state_hash_work); + xfrm_state_flush(net, IPSEC_PROTO_ANY, false); + flush_work(&net->xfrm.state_gc_work); + + WARN_ON(!list_empty(&net->xfrm.state_all)); + + sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); + WARN_ON(!hlist_empty(net->xfrm.state_byspi)); + xfrm_hash_free(net->xfrm.state_byspi, sz); + WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); + xfrm_hash_free(net->xfrm.state_bysrc, sz); + WARN_ON(!hlist_empty(net->xfrm.state_bydst)); + xfrm_hash_free(net->xfrm.state_bydst, sz); +} + +#ifdef CONFIG_AUDITSYSCALL +static void xfrm_audit_helper_sainfo(struct xfrm_state *x, + struct audit_buffer *audit_buf) +{ + struct xfrm_sec_ctx *ctx = x->security; + u32 spi = ntohl(x->id.spi); + + if (ctx) + audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", + ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); + + switch (x->props.family) { + case AF_INET: + audit_log_format(audit_buf, " src=%pI4 dst=%pI4", + &x->props.saddr.a4, &x->id.daddr.a4); + break; + case AF_INET6: + audit_log_format(audit_buf, " src=%pI6 dst=%pI6", + x->props.saddr.a6, x->id.daddr.a6); + break; + } + + audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); +} + +static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, + struct audit_buffer *audit_buf) +{ + const struct iphdr *iph4; + const struct ipv6hdr *iph6; + + switch (family) { + case AF_INET: + iph4 = ip_hdr(skb); + audit_log_format(audit_buf, " src=%pI4 dst=%pI4", + &iph4->saddr, &iph4->daddr); + break; + case AF_INET6: + iph6 = ipv6_hdr(skb); + audit_log_format(audit_buf, + " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", + &iph6->saddr, &iph6->daddr, + iph6->flow_lbl[0] & 0x0f, + iph6->flow_lbl[1], + iph6->flow_lbl[2]); + break; + } +} + +void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid) +{ + struct audit_buffer *audit_buf; + + audit_buf = xfrm_audit_start("SAD-add"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_usrinfo(task_valid, audit_buf); + xfrm_audit_helper_sainfo(x, audit_buf); + audit_log_format(audit_buf, " res=%u", result); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_add); + +void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid) +{ + struct audit_buffer *audit_buf; + + audit_buf = xfrm_audit_start("SAD-delete"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_usrinfo(task_valid, audit_buf); + xfrm_audit_helper_sainfo(x, audit_buf); + audit_log_format(audit_buf, " res=%u", result); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); + +void xfrm_audit_state_replay_overflow(struct xfrm_state *x, + struct sk_buff *skb) +{ + struct audit_buffer *audit_buf; + u32 spi; + + audit_buf = xfrm_audit_start("SA-replay-overflow"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); + /* don't record the sequence number because it's inherent in this kind + * of audit message */ + spi = ntohl(x->id.spi); + audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); + +void xfrm_audit_state_replay(struct xfrm_state *x, + struct sk_buff *skb, __be32 net_seq) +{ + struct audit_buffer *audit_buf; + u32 spi; + + audit_buf = xfrm_audit_start("SA-replayed-pkt"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); + spi = ntohl(x->id.spi); + audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", + spi, spi, ntohl(net_seq)); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_replay); + +void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) +{ + struct audit_buffer *audit_buf; + + audit_buf = xfrm_audit_start("SA-notfound"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_pktinfo(skb, family, audit_buf); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); + +void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, + __be32 net_spi, __be32 net_seq) +{ + struct audit_buffer *audit_buf; + u32 spi; + + audit_buf = xfrm_audit_start("SA-notfound"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_pktinfo(skb, family, audit_buf); + spi = ntohl(net_spi); + audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", + spi, spi, ntohl(net_seq)); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); + +void xfrm_audit_state_icvfail(struct xfrm_state *x, + struct sk_buff *skb, u8 proto) +{ + struct audit_buffer *audit_buf; + __be32 net_spi; + __be32 net_seq; + + audit_buf = xfrm_audit_start("SA-icv-failure"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); + if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { + u32 spi = ntohl(net_spi); + audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", + spi, spi, ntohl(net_seq)); + } + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); +#endif /* CONFIG_AUDITSYSCALL */ |