diff options
Diffstat (limited to 'net/xfrm/xfrm_state.c')
| -rw-r--r-- | net/xfrm/xfrm_state.c | 2268 |
1 files changed, 2268 insertions, 0 deletions
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c new file mode 100644 index 0000000..508337f --- /dev/null +++ b/net/xfrm/xfrm_state.c @@ -0,0 +1,2268 @@ +/* + * 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 "xfrm_hash.h" + +struct sock *xfrm_nl; +EXPORT_SYMBOL(xfrm_nl); + +u32 sysctl_xfrm_aevent_etime __read_mostly = XFRM_AE_ETIME; +EXPORT_SYMBOL(sysctl_xfrm_aevent_etime); + +u32 sysctl_xfrm_aevent_rseqth __read_mostly = XFRM_AE_SEQT_SIZE; +EXPORT_SYMBOL(sysctl_xfrm_aevent_rseqth); + +u32 sysctl_xfrm_acq_expires __read_mostly = 30; + +/* 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 DEFINE_SPINLOCK(xfrm_state_lock); + +/* Hash table to find appropriate SA towards given target (endpoint + * of tunnel or destination of transport mode) allowed by selector. + * + * Main use is finding SA after policy selected tunnel or transport mode. + * Also, it can be used by ah/esp icmp error handler to find offending SA. + */ +static LIST_HEAD(xfrm_state_all); +static struct hlist_head *xfrm_state_bydst __read_mostly; +static struct hlist_head *xfrm_state_bysrc __read_mostly; +static struct hlist_head *xfrm_state_byspi __read_mostly; +static unsigned int xfrm_state_hmask __read_mostly; +static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; +static unsigned int xfrm_state_num; +static unsigned int xfrm_state_genid; + +static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); +static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); + +#ifdef CONFIG_AUDITSYSCALL +static void xfrm_audit_state_replay(struct xfrm_state *x, + struct sk_buff *skb, __be32 net_seq); +#else +#define xfrm_audit_state_replay(x, s, sq) do { ; } while (0) +#endif /* CONFIG_AUDITSYSCALL */ + +static inline unsigned int xfrm_dst_hash(xfrm_address_t *daddr, + xfrm_address_t *saddr, + u32 reqid, + unsigned short family) +{ + return __xfrm_dst_hash(daddr, saddr, reqid, family, xfrm_state_hmask); +} + +static inline unsigned int xfrm_src_hash(xfrm_address_t *daddr, + xfrm_address_t *saddr, + unsigned short family) +{ + return __xfrm_src_hash(daddr, saddr, family, xfrm_state_hmask); +} + +static inline unsigned int +xfrm_spi_hash(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) +{ + return __xfrm_spi_hash(daddr, spi, proto, family, 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 *entry, *tmp; + struct xfrm_state *x; + + hlist_for_each_entry_safe(x, entry, 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(void) +{ + return ((xfrm_state_hmask + 1) << 1) * + sizeof(struct hlist_head); +} + +static DEFINE_MUTEX(hash_resize_mutex); + +static void xfrm_hash_resize(struct work_struct *__unused) +{ + struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; + unsigned long nsize, osize; + unsigned int nhashmask, ohashmask; + int i; + + mutex_lock(&hash_resize_mutex); + + nsize = xfrm_hash_new_size(); + ndst = xfrm_hash_alloc(nsize); + if (!ndst) + goto out_unlock; + nsrc = xfrm_hash_alloc(nsize); + if (!nsrc) { + xfrm_hash_free(ndst, nsize); + goto out_unlock; + } + nspi = xfrm_hash_alloc(nsize); + if (!nspi) { + xfrm_hash_free(ndst, nsize); + xfrm_hash_free(nsrc, nsize); + goto out_unlock; + } + + spin_lock_bh(&xfrm_state_lock); + + nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; + for (i = xfrm_state_hmask; i >= 0; i--) + xfrm_hash_transfer(xfrm_state_bydst+i, ndst, nsrc, nspi, + nhashmask); + + odst = xfrm_state_bydst; + osrc = xfrm_state_bysrc; + ospi = xfrm_state_byspi; + ohashmask = xfrm_state_hmask; + + xfrm_state_bydst = ndst; + xfrm_state_bysrc = nsrc; + xfrm_state_byspi = nspi; + xfrm_state_hmask = nhashmask; + + spin_unlock_bh(&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); + +out_unlock: + mutex_unlock(&hash_resize_mutex); +} + +static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize); + +DECLARE_WAIT_QUEUE_HEAD(km_waitq); +EXPORT_SYMBOL(km_waitq); + +static DEFINE_RWLOCK(xfrm_state_afinfo_lock); +static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO]; + +static struct work_struct xfrm_state_gc_work; +static HLIST_HEAD(xfrm_state_gc_list); +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); +void km_state_expired(struct xfrm_state *x, int hard, u32 pid); + +static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family) +{ + struct xfrm_state_afinfo *afinfo; + if (unlikely(family >= NPROTO)) + return NULL; + write_lock_bh(&xfrm_state_afinfo_lock); + afinfo = xfrm_state_afinfo[family]; + if (unlikely(!afinfo)) + write_unlock_bh(&xfrm_state_afinfo_lock); + return afinfo; +} + +static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo) + __releases(xfrm_state_afinfo_lock) +{ + write_unlock_bh(&xfrm_state_afinfo_lock); +} + +int xfrm_register_type(const struct xfrm_type *type, unsigned short family) +{ + struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); + const struct xfrm_type **typemap; + int err = 0; + + if (unlikely(afinfo == NULL)) + return -EAFNOSUPPORT; + typemap = afinfo->type_map; + + if (likely(typemap[type->proto] == NULL)) + typemap[type->proto] = type; + else + err = -EEXIST; + xfrm_state_unlock_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_lock_afinfo(family); + const struct xfrm_type **typemap; + int err = 0; + + if (unlikely(afinfo == NULL)) + return -EAFNOSUPPORT; + typemap = afinfo->type_map; + + if (unlikely(typemap[type->proto] != type)) + err = -ENOENT; + else + typemap[type->proto] = NULL; + xfrm_state_unlock_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); +} + +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_lock_afinfo(family); + if (unlikely(afinfo == NULL)) + return -EAFNOSUPPORT; + + err = -EEXIST; + modemap = afinfo->mode_map; + 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: + xfrm_state_unlock_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_lock_afinfo(family); + if (unlikely(afinfo == NULL)) + return -EAFNOSUPPORT; + + err = -ENOENT; + modemap = afinfo->mode_map; + if (likely(modemap[mode->encap] == mode)) { + modemap[mode->encap] = NULL; + module_put(mode->afinfo->owner); + err = 0; + } + + xfrm_state_unlock_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) +{ + del_timer_sync(&x->timer); + del_timer_sync(&x->rtimer); + kfree(x->aalg); + kfree(x->ealg); + kfree(x->calg); + kfree(x->encap); + kfree(x->coaddr); + 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 *data) +{ + struct xfrm_state *x; + struct hlist_node *entry, *tmp; + struct hlist_head gc_list; + + spin_lock_bh(&xfrm_state_gc_lock); + hlist_move_list(&xfrm_state_gc_list, &gc_list); + spin_unlock_bh(&xfrm_state_gc_lock); + + hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist) + xfrm_state_gc_destroy(x); + + wake_up(&km_waitq); +} + +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 void xfrm_timer_handler(unsigned long data) +{ + struct xfrm_state *x = (struct xfrm_state*)data; + 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) + 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; + else if (tmo < next) + next = 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) + mod_timer(&x->timer, jiffies + make_jiffies(next)); + + goto out; + +expired: + if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { + x->km.state = XFRM_STATE_EXPIRED; + wake_up(&km_waitq); + next = 2; + goto resched; + } + + err = __xfrm_state_delete(x); + if (!err && x->id.spi) + km_state_expired(x, 1, 0); + + xfrm_audit_state_delete(x, err ? 0 : 1, + audit_get_loginuid(current), + audit_get_sessionid(current), 0); + +out: + spin_unlock(&x->lock); +} + +static void xfrm_replay_timer_handler(unsigned long data); + +struct xfrm_state *xfrm_state_alloc(void) +{ + struct xfrm_state *x; + + x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); + + if (x) { + 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); + setup_timer(&x->timer, xfrm_timer_handler, (unsigned long)x); + 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) +{ + WARN_ON(x->km.state != XFRM_STATE_DEAD); + + spin_lock_bh(&xfrm_state_gc_lock); + hlist_add_head(&x->gclist, &xfrm_state_gc_list); + spin_unlock_bh(&xfrm_state_gc_lock); + schedule_work(&xfrm_state_gc_work); +} +EXPORT_SYMBOL(__xfrm_state_destroy); + +int __xfrm_state_delete(struct xfrm_state *x) +{ + int err = -ESRCH; + + if (x->km.state != XFRM_STATE_DEAD) { + x->km.state = XFRM_STATE_DEAD; + spin_lock(&xfrm_state_lock); + list_del(&x->km.all); + hlist_del(&x->bydst); + hlist_del(&x->bysrc); + if (x->id.spi) + hlist_del(&x->byspi); + xfrm_state_num--; + spin_unlock(&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(u8 proto, struct xfrm_audit *audit_info) +{ + int i, err = 0; + + for (i = 0; i <= xfrm_state_hmask; i++) { + struct hlist_node *entry; + struct xfrm_state *x; + + hlist_for_each_entry(x, entry, 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, + audit_info->loginuid, + audit_info->sessionid, + audit_info->secid); + return err; + } + } + } + + return err; +} +#else +static inline int +xfrm_state_flush_secctx_check(u8 proto, struct xfrm_audit *audit_info) +{ + return 0; +} +#endif + +int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info) +{ + int i, err = 0; + + spin_lock_bh(&xfrm_state_lock); + err = xfrm_state_flush_secctx_check(proto, audit_info); + if (err) + goto out; + + for (i = 0; i <= xfrm_state_hmask; i++) { + struct hlist_node *entry; + struct xfrm_state *x; +restart: + hlist_for_each_entry(x, entry, 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(&xfrm_state_lock); + + err = xfrm_state_delete(x); + xfrm_audit_state_delete(x, err ? 0 : 1, + audit_info->loginuid, + audit_info->sessionid, + audit_info->secid); + xfrm_state_put(x); + + spin_lock_bh(&xfrm_state_lock); + goto restart; + } + } + } + err = 0; + +out: + spin_unlock_bh(&xfrm_state_lock); + wake_up(&km_waitq); + return err; +} +EXPORT_SYMBOL(xfrm_state_flush); + +void xfrm_sad_getinfo(struct xfrmk_sadinfo *si) +{ + spin_lock_bh(&xfrm_state_lock); + si->sadcnt = xfrm_state_num; + si->sadhcnt = xfrm_state_hmask; + si->sadhmcnt = xfrm_state_hashmax; + spin_unlock_bh(&xfrm_state_lock); +} +EXPORT_SYMBOL(xfrm_sad_getinfo); + +static int +xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl, + struct xfrm_tmpl *tmpl, + xfrm_address_t *daddr, 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, fl, tmpl, daddr, saddr); + xfrm_state_put_afinfo(afinfo); + return 0; +} + +static struct xfrm_state *__xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) +{ + unsigned int h = xfrm_spi_hash(daddr, spi, proto, family); + struct xfrm_state *x; + struct hlist_node *entry; + + hlist_for_each_entry(x, entry, xfrm_state_byspi+h, byspi) { + if (x->props.family != family || + x->id.spi != spi || + x->id.proto != proto) + continue; + + switch (family) { + case AF_INET: + if (x->id.daddr.a4 != daddr->a4) + continue; + break; + case AF_INET6: + if (!ipv6_addr_equal((struct in6_addr *)daddr, + (struct in6_addr *) + x->id.daddr.a6)) + continue; + break; + } + + xfrm_state_hold(x); + return x; + } + + return NULL; +} + +static struct xfrm_state *__xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family) +{ + unsigned int h = xfrm_src_hash(daddr, saddr, family); + struct xfrm_state *x; + struct hlist_node *entry; + + hlist_for_each_entry(x, entry, xfrm_state_bysrc+h, bysrc) { + if (x->props.family != family || + x->id.proto != proto) + continue; + + switch (family) { + case AF_INET: + if (x->id.daddr.a4 != daddr->a4 || + x->props.saddr.a4 != saddr->a4) + continue; + break; + case AF_INET6: + if (!ipv6_addr_equal((struct in6_addr *)daddr, + (struct in6_addr *) + x->id.daddr.a6) || + !ipv6_addr_equal((struct in6_addr *)saddr, + (struct in6_addr *) + x->props.saddr.a6)) + continue; + break; + } + + 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) +{ + if (use_spi) + return __xfrm_state_lookup(&x->id.daddr, x->id.spi, + x->id.proto, family); + else + return __xfrm_state_lookup_byaddr(&x->id.daddr, + &x->props.saddr, + x->id.proto, family); +} + +static void xfrm_hash_grow_check(int have_hash_collision) +{ + if (have_hash_collision && + (xfrm_state_hmask + 1) < xfrm_state_hashmax && + xfrm_state_num > xfrm_state_hmask) + schedule_work(&xfrm_hash_work); +} + +struct xfrm_state * +xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, + struct flowi *fl, struct xfrm_tmpl *tmpl, + struct xfrm_policy *pol, int *err, + unsigned short family) +{ + unsigned int h; + struct hlist_node *entry; + struct xfrm_state *x, *x0, *to_put; + int acquire_in_progress = 0; + int error = 0; + struct xfrm_state *best = NULL; + + to_put = NULL; + + spin_lock_bh(&xfrm_state_lock); + h = xfrm_dst_hash(daddr, saddr, tmpl->reqid, family); + hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { + if (x->props.family == family && + x->props.reqid == tmpl->reqid && + !(x->props.flags & XFRM_STATE_WILDRECV) && + xfrm_state_addr_check(x, daddr, saddr, family) && + tmpl->mode == x->props.mode && + tmpl->id.proto == x->id.proto && + (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) { + /* 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)) + continue; + 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) { + acquire_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; + } + } + } + + x = best; + if (!x && !error && !acquire_in_progress) { + if (tmpl->id.spi && + (x0 = __xfrm_state_lookup(daddr, tmpl->id.spi, + tmpl->id.proto, family)) != NULL) { + to_put = x0; + error = -EEXIST; + goto out; + } + x = xfrm_state_alloc(); + if (x == NULL) { + error = -ENOMEM; + goto out; + } + /* Initialize temporary selector matching only + * to current session. */ + xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family); + + error = security_xfrm_state_alloc_acquire(x, pol->security, fl->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, &xfrm_state_all); + hlist_add_head(&x->bydst, xfrm_state_bydst+h); + h = xfrm_src_hash(daddr, saddr, family); + hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); + if (x->id.spi) { + h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, family); + hlist_add_head(&x->byspi, xfrm_state_byspi+h); + } + x->lft.hard_add_expires_seconds = sysctl_xfrm_acq_expires; + x->timer.expires = jiffies + sysctl_xfrm_acq_expires*HZ; + add_timer(&x->timer); + xfrm_state_num++; + xfrm_hash_grow_check(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(&xfrm_state_lock); + if (to_put) + xfrm_state_put(to_put); + return x; +} + +struct xfrm_state * +xfrm_stateonly_find(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; + struct hlist_node *entry; + + spin_lock(&xfrm_state_lock); + h = xfrm_dst_hash(daddr, saddr, reqid, family); + hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { + if (x->props.family == family && + x->props.reqid == reqid && + !(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(&xfrm_state_lock); + + + return rx; +} +EXPORT_SYMBOL(xfrm_stateonly_find); + +static void __xfrm_state_insert(struct xfrm_state *x) +{ + unsigned int h; + + x->genid = ++xfrm_state_genid; + + list_add(&x->km.all, &xfrm_state_all); + + h = xfrm_dst_hash(&x->id.daddr, &x->props.saddr, + x->props.reqid, x->props.family); + hlist_add_head(&x->bydst, xfrm_state_bydst+h); + + h = xfrm_src_hash(&x->id.daddr, &x->props.saddr, x->props.family); + hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); + + if (x->id.spi) { + h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, + x->props.family); + + hlist_add_head(&x->byspi, xfrm_state_byspi+h); + } + + mod_timer(&x->timer, jiffies + HZ); + if (x->replay_maxage) + mod_timer(&x->rtimer, jiffies + x->replay_maxage); + + wake_up(&km_waitq); + + xfrm_state_num++; + + xfrm_hash_grow_check(x->bydst.next != NULL); +} + +/* xfrm_state_lock is held */ +static void __xfrm_state_bump_genids(struct xfrm_state *xnew) +{ + unsigned short family = xnew->props.family; + u32 reqid = xnew->props.reqid; + struct xfrm_state *x; + struct hlist_node *entry; + unsigned int h; + + h = xfrm_dst_hash(&xnew->id.daddr, &xnew->props.saddr, reqid, family); + hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { + if (x->props.family == family && + x->props.reqid == reqid && + !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) && + !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family)) + x->genid = xfrm_state_genid; + } +} + +void xfrm_state_insert(struct xfrm_state *x) +{ + spin_lock_bh(&xfrm_state_lock); + __xfrm_state_bump_genids(x); + __xfrm_state_insert(x); + spin_unlock_bh(&xfrm_state_lock); +} +EXPORT_SYMBOL(xfrm_state_insert); + +/* xfrm_state_lock is held */ +static struct xfrm_state *__find_acq_core(unsigned short family, u8 mode, u32 reqid, u8 proto, xfrm_address_t *daddr, xfrm_address_t *saddr, int create) +{ + unsigned int h = xfrm_dst_hash(daddr, saddr, reqid, family); + struct hlist_node *entry; + struct xfrm_state *x; + + hlist_for_each_entry(x, entry, 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) + continue; + + switch (family) { + case AF_INET: + if (x->id.daddr.a4 != daddr->a4 || + x->props.saddr.a4 != saddr->a4) + continue; + break; + case AF_INET6: + if (!ipv6_addr_equal((struct in6_addr *)x->id.daddr.a6, + (struct in6_addr *)daddr) || + !ipv6_addr_equal((struct in6_addr *) + x->props.saddr.a6, + (struct in6_addr *)saddr)) + continue; + break; + } + + xfrm_state_hold(x); + return x; + } + + if (!create) + return NULL; + + x = xfrm_state_alloc(); + 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: + ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6, + (struct in6_addr *)daddr); + ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6, + (struct in6_addr *)saddr); + x->sel.prefixlen_d = 128; + x->sel.prefixlen_s = 128; + ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6, + (struct in6_addr *)saddr); + ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6, + (struct in6_addr *)daddr); + break; + } + + x->km.state = XFRM_STATE_ACQ; + x->id.proto = proto; + x->props.family = family; + x->props.mode = mode; + x->props.reqid = reqid; + x->lft.hard_add_expires_seconds = sysctl_xfrm_acq_expires; + xfrm_state_hold(x); + x->timer.expires = jiffies + sysctl_xfrm_acq_expires*HZ; + add_timer(&x->timer); + list_add(&x->km.all, &xfrm_state_all); + hlist_add_head(&x->bydst, xfrm_state_bydst+h); + h = xfrm_src_hash(daddr, saddr, family); + hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); + + xfrm_state_num++; + + xfrm_hash_grow_check(x->bydst.next != NULL); + } + + return x; +} + +static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq); + +int xfrm_state_add(struct xfrm_state *x) +{ + struct xfrm_state *x1, *to_put; + int family; + int err; + int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); + + family = x->props.family; + + to_put = NULL; + + spin_lock_bh(&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(x->km.seq); + if (x1 && ((x1->id.proto != x->id.proto) || + xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) { + to_put = x1; + x1 = NULL; + } + } + + if (use_spi && !x1) + x1 = __find_acq_core(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(&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, int *errp) +{ + int err = -ENOMEM; + struct xfrm_state *x = xfrm_state_alloc(); + if (!x) + goto error; + + 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_clone(orig->aalg); + if (!x->aalg) + goto error; + } + x->props.aalgo = orig->props.aalgo; + + 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; + } + + err = xfrm_init_state(x); + if (err) + goto error; + + x->props.flags = orig->props.flags; + + x->curlft.add_time = orig->curlft.add_time; + x->km.state = orig->km.state; + x->km.seq = orig->km.seq; + + return x; + + error: + if (errp) + *errp = err; + if (x) { + kfree(x->aalg); + kfree(x->ealg); + kfree(x->calg); + kfree(x->encap); + kfree(x->coaddr); + } + kfree(x); + return NULL; +} + +/* xfrm_state_lock is held */ +struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m) +{ + unsigned int h; + struct xfrm_state *x; + struct hlist_node *entry; + + if (m->reqid) { + h = xfrm_dst_hash(&m->old_daddr, &m->old_saddr, + m->reqid, m->old_family); + hlist_for_each_entry(x, entry, 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_cmp(&x->id.daddr, &m->old_daddr, + m->old_family) || + xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, + m->old_family)) + continue; + xfrm_state_hold(x); + return x; + } + } else { + h = xfrm_src_hash(&m->old_daddr, &m->old_saddr, + m->old_family); + hlist_for_each_entry(x, entry, xfrm_state_bysrc+h, bysrc) { + if (x->props.mode != m->mode || + x->id.proto != m->proto) + continue; + if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, + m->old_family) || + xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, + m->old_family)) + continue; + xfrm_state_hold(x); + return x; + } + } + + return NULL; +} +EXPORT_SYMBOL(xfrm_migrate_state_find); + +struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, + struct xfrm_migrate *m) +{ + struct xfrm_state *xc; + int err; + + xc = xfrm_state_clone(x, &err); + 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_cmp(&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 ((err = xfrm_state_add(xc)) < 0) + goto error; + } + + return xc; +error: + kfree(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); + + to_put = NULL; + + spin_lock_bh(&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(&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; + + mod_timer(&x1->timer, jiffies + HZ); + if (x1->curlft.use_time) + xfrm_state_check_expire(x1); + + err = 0; + } + 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->km.state != XFRM_STATE_VALID) + return -EINVAL; + + if (x->curlft.bytes >= x->lft.hard_byte_limit || + x->curlft.packets >= x->lft.hard_packet_limit) { + x->km.state = XFRM_STATE_EXPIRED; + mod_timer(&x->timer, jiffies); + 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(xfrm_address_t *daddr, __be32 spi, u8 proto, + unsigned short family) +{ + struct xfrm_state *x; + + spin_lock_bh(&xfrm_state_lock); + x = __xfrm_state_lookup(daddr, spi, proto, family); + spin_unlock_bh(&xfrm_state_lock); + return x; +} +EXPORT_SYMBOL(xfrm_state_lookup); + +struct xfrm_state * +xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, + u8 proto, unsigned short family) +{ + struct xfrm_state *x; + + spin_lock_bh(&xfrm_state_lock); + x = __xfrm_state_lookup_byaddr(daddr, saddr, proto, family); + spin_unlock_bh(&xfrm_state_lock); + return x; +} +EXPORT_SYMBOL(xfrm_state_lookup_byaddr); + +struct xfrm_state * +xfrm_find_acq(u8 mode, u32 reqid, u8 proto, + xfrm_address_t *daddr, xfrm_address_t *saddr, + int create, unsigned short family) +{ + struct xfrm_state *x; + + spin_lock_bh(&xfrm_state_lock); + x = __find_acq_core(family, mode, reqid, proto, daddr, saddr, create); + spin_unlock_bh(&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) +{ + int err = 0; + struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); + if (!afinfo) + return -EAFNOSUPPORT; + + spin_lock_bh(&xfrm_state_lock); + if (afinfo->tmpl_sort) + err = afinfo->tmpl_sort(dst, src, n); + spin_unlock_bh(&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); + if (!afinfo) + return -EAFNOSUPPORT; + + spin_lock_bh(&xfrm_state_lock); + if (afinfo->state_sort) + err = afinfo->state_sort(dst, src, n); + spin_unlock_bh(&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(u32 seq) +{ + int i; + + for (i = 0; i <= xfrm_state_hmask; i++) { + struct hlist_node *entry; + struct xfrm_state *x; + + hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { + if (x->km.seq == seq && + x->km.state == XFRM_STATE_ACQ) { + xfrm_state_hold(x); + return x; + } + } + } + return NULL; +} + +struct xfrm_state *xfrm_find_acq_byseq(u32 seq) +{ + struct xfrm_state *x; + + spin_lock_bh(&xfrm_state_lock); + x = __xfrm_find_acq_byseq(seq); + spin_unlock_bh(&xfrm_state_lock); + return x; +} +EXPORT_SYMBOL(xfrm_find_acq_byseq); + +u32 xfrm_get_acqseq(void) +{ + u32 res; + static u32 acqseq; + static DEFINE_SPINLOCK(acqseq_lock); + + spin_lock_bh(&acqseq_lock); + res = (++acqseq ? : ++acqseq); + spin_unlock_bh(&acqseq_lock); + return res; +} +EXPORT_SYMBOL(xfrm_get_acqseq); + +int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) +{ + unsigned int h; + struct xfrm_state *x0; + int err = -ENOENT; + __be32 minspi = htonl(low); + __be32 maxspi = htonl(high); + + 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(&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 + net_random()%(high-low+1); + x0 = xfrm_state_lookup(&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(&xfrm_state_lock); + h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, x->props.family); + hlist_add_head(&x->byspi, xfrm_state_byspi+h); + spin_unlock_bh(&xfrm_state_lock); + + err = 0; + } + +unlock: + spin_unlock_bh(&x->lock); + + return err; +} +EXPORT_SYMBOL(xfrm_alloc_spi); + +int xfrm_state_walk(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(&xfrm_state_lock); + if (list_empty(&walk->all)) + x = list_first_entry(&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, &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; + 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(&xfrm_state_lock); + return err; +} +EXPORT_SYMBOL(xfrm_state_walk); + +void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto) +{ + INIT_LIST_HEAD(&walk->all); + walk->proto = proto; + walk->state = XFRM_STATE_DEAD; + walk->seq = 0; +} +EXPORT_SYMBOL(xfrm_state_walk_init); + +void xfrm_state_walk_done(struct xfrm_state_walk *walk) +{ + if (list_empty(&walk->all)) + return; + + spin_lock_bh(&xfrm_state_lock); + list_del(&walk->all); + spin_lock_bh(&xfrm_state_lock); +} +EXPORT_SYMBOL(xfrm_state_walk_done); + + +void xfrm_replay_notify(struct xfrm_state *x, int event) +{ + struct km_event c; + /* we send notify messages in case + * 1. we updated on of the sequence numbers, and the seqno difference + * is at least x->replay_maxdiff, in this case we also update the + * timeout of our timer function + * 2. if x->replay_maxage has elapsed since last update, + * and there were changes + * + * The state structure must be locked! + */ + + switch (event) { + case XFRM_REPLAY_UPDATE: + if (x->replay_maxdiff && + (x->replay.seq - x->preplay.seq < x->replay_maxdiff) && + (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) { + if (x->xflags & XFRM_TIME_DEFER) + event = XFRM_REPLAY_TIMEOUT; + else + return; + } + + break; + + case XFRM_REPLAY_TIMEOUT: + if ((x->replay.seq == x->preplay.seq) && + (x->replay.bitmap == x->preplay.bitmap) && + (x->replay.oseq == x->preplay.oseq)) { + x->xflags |= XFRM_TIME_DEFER; + return; + } + + break; + } + + memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state)); + c.event = XFRM_MSG_NEWAE; + c.data.aevent = event; + km_state_notify(x, &c); + + if (x->replay_maxage && + !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) + x->xflags &= ~XFRM_TIME_DEFER; +} + +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()) + xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); + else + x->xflags |= XFRM_TIME_DEFER; + } + + spin_unlock(&x->lock); +} + +int xfrm_replay_check(struct xfrm_state *x, + struct sk_buff *skb, __be32 net_seq) +{ + u32 diff; + u32 seq = ntohl(net_seq); + + if (unlikely(seq == 0)) + goto err; + + if (likely(seq > x->replay.seq)) + return 0; + + diff = x->replay.seq - seq; + if (diff >= min_t(unsigned int, x->props.replay_window, + sizeof(x->replay.bitmap) * 8)) { + x->stats.replay_window++; + goto err; + } + + if (x->replay.bitmap & (1U << diff)) { + x->stats.replay++; + goto err; + } + return 0; + +err: + xfrm_audit_state_replay(x, skb, net_seq); + return -EINVAL; +} + +void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq) +{ + u32 diff; + u32 seq = ntohl(net_seq); + + if (seq > x->replay.seq) { + diff = seq - x->replay.seq; + if (diff < x->props.replay_window) + x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; + else + x->replay.bitmap = 1; + x->replay.seq = seq; + } else { + diff = x->replay.seq - seq; + x->replay.bitmap |= (1U << diff); + } + + if (xfrm_aevent_is_on()) + xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); +} + +static LIST_HEAD(xfrm_km_list); +static DEFINE_RWLOCK(xfrm_km_lock); + +void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) +{ + struct xfrm_mgr *km; + + read_lock(&xfrm_km_lock); + list_for_each_entry(km, &xfrm_km_list, list) + if (km->notify_policy) + km->notify_policy(xp, dir, c); + read_unlock(&xfrm_km_lock); +} + +void km_state_notify(struct xfrm_state *x, struct km_event *c) +{ + struct xfrm_mgr *km; + read_lock(&xfrm_km_lock); + list_for_each_entry(km, &xfrm_km_list, list) + if (km->notify) + km->notify(x, c); + read_unlock(&xfrm_km_lock); +} + +EXPORT_SYMBOL(km_policy_notify); +EXPORT_SYMBOL(km_state_notify); + +void km_state_expired(struct xfrm_state *x, int hard, u32 pid) +{ + struct km_event c; + + c.data.hard = hard; + c.pid = pid; + c.event = XFRM_MSG_EXPIRE; + km_state_notify(x, &c); + + if (hard) + wake_up(&km_waitq); +} + +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; + + read_lock(&xfrm_km_lock); + list_for_each_entry(km, &xfrm_km_list, list) { + acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); + if (!acqret) + err = acqret; + } + read_unlock(&xfrm_km_lock); + 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; + + read_lock(&xfrm_km_lock); + list_for_each_entry(km, &xfrm_km_list, list) { + if (km->new_mapping) + err = km->new_mapping(x, ipaddr, sport); + if (!err) + break; + } + read_unlock(&xfrm_km_lock); + return err; +} +EXPORT_SYMBOL(km_new_mapping); + +void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid) +{ + struct km_event c; + + c.data.hard = hard; + c.pid = pid; + c.event = XFRM_MSG_POLEXPIRE; + km_policy_notify(pol, dir, &c); + + if (hard) + wake_up(&km_waitq); +} +EXPORT_SYMBOL(km_policy_expired); + +#ifdef CONFIG_XFRM_MIGRATE +int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, + struct xfrm_migrate *m, int num_migrate, + struct xfrm_kmaddress *k) +{ + int err = -EINVAL; + int ret; + struct xfrm_mgr *km; + + read_lock(&xfrm_km_lock); + list_for_each_entry(km, &xfrm_km_list, list) { + if (km->migrate) { + ret = km->migrate(sel, dir, type, m, num_migrate, k); + if (!ret) + err = ret; + } + } + read_unlock(&xfrm_km_lock); + return err; +} +EXPORT_SYMBOL(km_migrate); +#endif + +int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) +{ + int err = -EINVAL; + int ret; + struct xfrm_mgr *km; + + read_lock(&xfrm_km_lock); + list_for_each_entry(km, &xfrm_km_list, list) { + if (km->report) { + ret = km->report(proto, sel, addr); + if (!ret) + err = ret; + } + } + read_unlock(&xfrm_km_lock); + return err; +} +EXPORT_SYMBOL(km_report); + +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; + read_lock(&xfrm_km_lock); + list_for_each_entry(km, &xfrm_km_list, list) { + pol = km->compile_policy(sk, optname, data, + optlen, &err); + if (err >= 0) + break; + } + read_unlock(&xfrm_km_lock); + + 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); + +int xfrm_register_km(struct xfrm_mgr *km) +{ + write_lock_bh(&xfrm_km_lock); + list_add_tail(&km->list, &xfrm_km_list); + write_unlock_bh(&xfrm_km_lock); + return 0; +} +EXPORT_SYMBOL(xfrm_register_km); + +int xfrm_unregister_km(struct xfrm_mgr *km) +{ + write_lock_bh(&xfrm_km_lock); + list_del(&km->list); + write_unlock_bh(&xfrm_km_lock); + 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; + write_lock_bh(&xfrm_state_afinfo_lock); + if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) + err = -ENOBUFS; + else + xfrm_state_afinfo[afinfo->family] = afinfo; + write_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; + write_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 + xfrm_state_afinfo[afinfo->family] = NULL; + } + write_unlock_bh(&xfrm_state_afinfo_lock); + return err; +} +EXPORT_SYMBOL(xfrm_state_unregister_afinfo); + +static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) +{ + struct xfrm_state_afinfo *afinfo; + if (unlikely(family >= NPROTO)) + return NULL; + read_lock(&xfrm_state_afinfo_lock); + afinfo = xfrm_state_afinfo[family]; + if (unlikely(!afinfo)) + read_unlock(&xfrm_state_afinfo_lock); + return afinfo; +} + +static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) + __releases(xfrm_state_afinfo_lock) +{ + read_unlock(&xfrm_state_afinfo_lock); +} + +/* 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) +{ + 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; + + inner_mode = xfrm_get_mode(x->props.mode, AF_INET); + if (inner_mode == NULL) + goto error; + + if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { + xfrm_put_mode(inner_mode); + goto error; + } + + inner_mode_iaf = xfrm_get_mode(x->props.mode, AF_INET6); + if (inner_mode_iaf == NULL) + goto error; + + if (!(inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)) { + xfrm_put_mode(inner_mode_iaf); + goto error; + } + + if (x->props.family == AF_INET) { + x->inner_mode = inner_mode; + x->inner_mode_iaf = inner_mode_iaf; + } else { + x->inner_mode = inner_mode_iaf; + x->inner_mode_iaf = inner_mode; + } + } + + 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) + goto error; + + x->km.state = XFRM_STATE_VALID; + +error: + return err; +} + +EXPORT_SYMBOL(xfrm_init_state); + +void __init xfrm_state_init(void) +{ + unsigned int sz; + + sz = sizeof(struct hlist_head) * 8; + + xfrm_state_bydst = xfrm_hash_alloc(sz); + xfrm_state_bysrc = xfrm_hash_alloc(sz); + xfrm_state_byspi = xfrm_hash_alloc(sz); + if (!xfrm_state_bydst || !xfrm_state_bysrc || !xfrm_state_byspi) + panic("XFRM: Cannot allocate bydst/bysrc/byspi hashes."); + xfrm_state_hmask = ((sz / sizeof(struct hlist_head)) - 1); + + INIT_WORK(&xfrm_state_gc_work, xfrm_state_gc_task); +} + +#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=" NIPQUAD_FMT " dst=" NIPQUAD_FMT, + NIPQUAD(x->props.saddr.a4), + NIPQUAD(x->id.daddr.a4)); + break; + case AF_INET6: + audit_log_format(audit_buf, + " src=" NIP6_FMT " dst=" NIP6_FMT, + NIP6(*(struct in6_addr *)x->props.saddr.a6), + NIP6(*(struct in6_addr *)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) +{ + struct iphdr *iph4; + struct ipv6hdr *iph6; + + switch (family) { + case AF_INET: + iph4 = ip_hdr(skb); + audit_log_format(audit_buf, + " src=" NIPQUAD_FMT " dst=" NIPQUAD_FMT, + NIPQUAD(iph4->saddr), + NIPQUAD(iph4->daddr)); + break; + case AF_INET6: + iph6 = ipv6_hdr(skb); + audit_log_format(audit_buf, + " src=" NIP6_FMT " dst=" NIP6_FMT + " flowlbl=0x%x%02x%02x", + NIP6(iph6->saddr), + NIP6(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, + uid_t auid, u32 sessionid, u32 secid) +{ + struct audit_buffer *audit_buf; + + audit_buf = xfrm_audit_start("SAD-add"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_usrinfo(auid, sessionid, secid, 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, + uid_t auid, u32 sessionid, u32 secid) +{ + struct audit_buffer *audit_buf; + + audit_buf = xfrm_audit_start("SAD-delete"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_usrinfo(auid, sessionid, secid, 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); + +static 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); +} + +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 */ |
