| /* |
| * 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 <linux/uaccess.h> |
| #include <linux/ktime.h> |
| #include <linux/slab.h> |
| #include <linux/interrupt.h> |
| #include <linux/kernel.h> |
| |
| #include "xfrm_hash.h" |
| |
| #define xfrm_state_deref_prot(table, net) \ |
| rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock)) |
| |
| static void xfrm_state_gc_task(struct work_struct *work); |
| |
| /* 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 __read_mostly seqcount_t xfrm_state_hash_generation = SEQCNT_ZERO(xfrm_state_hash_generation); |
| static struct kmem_cache *xfrm_state_cache __ro_after_init; |
| |
| static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task); |
| static HLIST_HEAD(xfrm_state_gc_list); |
| |
| static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x) |
| { |
| return refcount_inc_not_zero(&x->refcnt); |
| } |
| |
| 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_rcu(&x->bydst, ndsttable + h); |
| |
| h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, |
| x->props.family, |
| nhashmask); |
| hlist_add_head_rcu(&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_rcu(&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); |
| write_seqcount_begin(&xfrm_state_hash_generation); |
| |
| nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; |
| odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net); |
| for (i = net->xfrm.state_hmask; i >= 0; i--) |
| xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nhashmask); |
| |
| osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net); |
| ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net); |
| ohashmask = net->xfrm.state_hmask; |
| |
| rcu_assign_pointer(net->xfrm.state_bydst, ndst); |
| rcu_assign_pointer(net->xfrm.state_bysrc, nsrc); |
| rcu_assign_pointer(net->xfrm.state_byspi, nspi); |
| net->xfrm.state_hmask = nhashmask; |
| |
| write_seqcount_end(&xfrm_state_hash_generation); |
| spin_unlock_bh(&net->xfrm.xfrm_state_lock); |
| |
| osize = (ohashmask + 1) * sizeof(struct hlist_head); |
| |
| synchronize_rcu(); |
| |
| 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); |
| rcu_read_unlock(); |
| 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); |
| rcu_read_unlock(); |
| 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 = READ_ONCE(typemap[proto]); |
| if (unlikely(type && !try_module_get(type->owner))) |
| type = NULL; |
| |
| rcu_read_unlock(); |
| |
| if (!type && !modload_attempted) { |
| request_module("xfrm-type-%d-%d", family, proto); |
| modload_attempted = 1; |
| goto retry; |
| } |
| |
| return type; |
| } |
| |
| static void xfrm_put_type(const struct xfrm_type *type) |
| { |
| module_put(type->owner); |
| } |
| |
| static DEFINE_SPINLOCK(xfrm_type_offload_lock); |
| int xfrm_register_type_offload(const struct xfrm_type_offload *type, |
| unsigned short family) |
| { |
| struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); |
| const struct xfrm_type_offload **typemap; |
| int err = 0; |
| |
| if (unlikely(afinfo == NULL)) |
| return -EAFNOSUPPORT; |
| typemap = afinfo->type_offload_map; |
| spin_lock_bh(&xfrm_type_offload_lock); |
| |
| if (likely(typemap[type->proto] == NULL)) |
| typemap[type->proto] = type; |
| else |
| err = -EEXIST; |
| spin_unlock_bh(&xfrm_type_offload_lock); |
| rcu_read_unlock(); |
| return err; |
| } |
| EXPORT_SYMBOL(xfrm_register_type_offload); |
| |
| int xfrm_unregister_type_offload(const struct xfrm_type_offload *type, |
| unsigned short family) |
| { |
| struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); |
| const struct xfrm_type_offload **typemap; |
| int err = 0; |
| |
| if (unlikely(afinfo == NULL)) |
| return -EAFNOSUPPORT; |
| typemap = afinfo->type_offload_map; |
| spin_lock_bh(&xfrm_type_offload_lock); |
| |
| if (unlikely(typemap[type->proto] != type)) |
| err = -ENOENT; |
| else |
| typemap[type->proto] = NULL; |
| spin_unlock_bh(&xfrm_type_offload_lock); |
| rcu_read_unlock(); |
| return err; |
| } |
| EXPORT_SYMBOL(xfrm_unregister_type_offload); |
| |
| static const struct xfrm_type_offload * |
| xfrm_get_type_offload(u8 proto, unsigned short family, bool try_load) |
| { |
| struct xfrm_state_afinfo *afinfo; |
| const struct xfrm_type_offload **typemap; |
| const struct xfrm_type_offload *type; |
| |
| retry: |
| afinfo = xfrm_state_get_afinfo(family); |
| if (unlikely(afinfo == NULL)) |
| return NULL; |
| typemap = afinfo->type_offload_map; |
| |
| type = typemap[proto]; |
| if ((type && !try_module_get(type->owner))) |
| type = NULL; |
| |
| rcu_read_unlock(); |
| |
| if (!type && try_load) { |
| request_module("xfrm-offload-%d-%d", family, proto); |
| try_load = false; |
| goto retry; |
| } |
| |
| return type; |
| } |
| |
| static void xfrm_put_type_offload(const struct xfrm_type_offload *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); |
| rcu_read_unlock(); |
| 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); |
| rcu_read_unlock(); |
| 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 = READ_ONCE(afinfo->mode_map[encap]); |
| if (unlikely(mode && !try_module_get(mode->owner))) |
| mode = NULL; |
| |
| rcu_read_unlock(); |
| if (!mode && !modload_attempted) { |
| request_module("xfrm-mode-%d-%d", family, encap); |
| modload_attempted = 1; |
| goto retry; |
| } |
| |
| return mode; |
| } |
| |
| static void xfrm_put_mode(struct xfrm_mode *mode) |
| { |
| module_put(mode->owner); |
| } |
| |
| void xfrm_state_free(struct xfrm_state *x) |
| { |
| kmem_cache_free(xfrm_state_cache, x); |
| } |
| EXPORT_SYMBOL(xfrm_state_free); |
| |
| static void ___xfrm_state_destroy(struct xfrm_state *x) |
| { |
| hrtimer_cancel(&x->mtimer); |
| del_timer_sync(&x->rtimer); |
| kfree(x->aead); |
| 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_offload) |
| xfrm_put_type_offload(x->type_offload); |
| if (x->type) { |
| x->type->destructor(x); |
| xfrm_put_type(x->type); |
| } |
| xfrm_dev_state_free(x); |
| security_xfrm_state_free(x); |
| xfrm_state_free(x); |
| } |
| |
| static void xfrm_state_gc_task(struct work_struct *work) |
| { |
| struct xfrm_state *x; |
| struct hlist_node *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); |
| |
| synchronize_rcu(); |
| |
| hlist_for_each_entry_safe(x, tmp, &gc_list, gclist) |
| ___xfrm_state_destroy(x); |
| } |
| |
| static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me) |
| { |
| struct xfrm_state *x = container_of(me, struct xfrm_state, mtimer); |
| enum hrtimer_restart ret = HRTIMER_NORESTART; |
| time64_t now = ktime_get_real_seconds(); |
| time64_t next = TIME64_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. |
| * workaround: 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 != TIME64_MAX) { |
| hrtimer_forward_now(&x->mtimer, ktime_set(next, 0)); |
| ret = HRTIMER_RESTART; |
| } |
| |
| 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 ret; |
| } |
| |
| static void xfrm_replay_timer_handler(struct timer_list *t); |
| |
| struct xfrm_state *xfrm_state_alloc(struct net *net) |
| { |
| struct xfrm_state *x; |
| |
| x = kmem_cache_alloc(xfrm_state_cache, GFP_ATOMIC | __GFP_ZERO); |
| |
| if (x) { |
| write_pnet(&x->xs_net, net); |
| refcount_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); |
| hrtimer_init(&x->mtimer, CLOCK_BOOTTIME, HRTIMER_MODE_ABS_SOFT); |
| x->mtimer.function = xfrm_timer_handler; |
| timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0); |
| x->curlft.add_time = ktime_get_real_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, bool sync) |
| { |
| WARN_ON(x->km.state != XFRM_STATE_DEAD); |
| |
| if (sync) { |
| synchronize_rcu(); |
| ___xfrm_state_destroy(x); |
| } else { |
| 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) |
| { |
| 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_rcu(&x->bydst); |
| hlist_del_rcu(&x->bysrc); |
| if (x->id.spi) |
| hlist_del_rcu(&x->byspi); |
| net->xfrm.state_num--; |
| spin_unlock(&net->xfrm.xfrm_state_lock); |
| |
| xfrm_dev_state_delete(x); |
| |
| /* 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; |
| } |
| |
| static inline int |
| xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid) |
| { |
| int i, err = 0; |
| |
| for (i = 0; i <= net->xfrm.state_hmask; i++) { |
| struct xfrm_state *x; |
| struct xfrm_state_offload *xso; |
| |
| hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { |
| xso = &x->xso; |
| |
| if (xso->dev == dev && |
| (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; |
| } |
| |
| static inline int |
| xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid) |
| { |
| return 0; |
| } |
| #endif |
| |
| int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync) |
| { |
| 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); |
| if (sync) |
| xfrm_state_put_sync(x); |
| else |
| xfrm_state_put(x); |
| if (!err) |
| cnt++; |
| |
| spin_lock_bh(&net->xfrm.xfrm_state_lock); |
| goto restart; |
| } |
| } |
| } |
| out: |
| spin_unlock_bh(&net->xfrm.xfrm_state_lock); |
| if (cnt) |
| err = 0; |
| |
| return err; |
| } |
| EXPORT_SYMBOL(xfrm_state_flush); |
| |
| int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid) |
| { |
| int i, err = 0, cnt = 0; |
| |
| spin_lock_bh(&net->xfrm.xfrm_state_lock); |
| err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid); |
| if (err) |
| goto out; |
| |
| err = -ESRCH; |
| for (i = 0; i <= net->xfrm.state_hmask; i++) { |
| struct xfrm_state *x; |
| struct xfrm_state_offload *xso; |
| restart: |
| hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { |
| xso = &x->xso; |
| |
| if (!xfrm_state_kern(x) && xso->dev == dev) { |
| 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_dev_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 + 1; |
| si->sadhmcnt = xfrm_state_hashmax; |
| spin_unlock_bh(&net->xfrm.xfrm_state_lock); |
| } |
| EXPORT_SYMBOL(xfrm_sad_getinfo); |
| |
| static void |
| 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_afinfo_get_rcu(family); |
| |
| if (!afinfo) |
| return; |
| |
| afinfo->init_tempsel(&x->sel, fl); |
| |
| if (family != tmpl->encap_family) { |
| afinfo = xfrm_state_afinfo_get_rcu(tmpl->encap_family); |
| if (!afinfo) |
| return; |
| } |
| afinfo->init_temprop(x, tmpl, daddr, saddr); |
| } |
| |
| 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_rcu(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; |
| if (!xfrm_state_hold_rcu(x)) |
| continue; |
| 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_rcu(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; |
| if (!xfrm_state_hold_rcu(x)) |
| continue; |
| 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, u32 if_id) |
| { |
| 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; |
| unsigned int sequence; |
| struct km_event c; |
| |
| to_put = NULL; |
| |
| sequence = read_seqcount_begin(&xfrm_state_hash_generation); |
| |
| rcu_read_lock(); |
| h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family); |
| hlist_for_each_entry_rcu(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->if_id == if_id && |
| !(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_rcu(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->if_id == if_id && |
| !(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)); |
| x->if_id = if_id; |
| |
| 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) { |
| spin_lock_bh(&net->xfrm.xfrm_state_lock); |
| x->km.state = XFRM_STATE_ACQ; |
| list_add(&x->km.all, &net->xfrm.state_all); |
| hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h); |
| h = xfrm_src_hash(net, daddr, saddr, encap_family); |
| hlist_add_head_rcu(&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_rcu(&x->byspi, net->xfrm.state_byspi + h); |
| } |
| x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; |
| hrtimer_start(&x->mtimer, |
| ktime_set(net->xfrm.sysctl_acq_expires, 0), |
| HRTIMER_MODE_REL_SOFT); |
| net->xfrm.state_num++; |
| xfrm_hash_grow_check(net, x->bydst.next != NULL); |
| spin_unlock_bh(&net->xfrm.xfrm_state_lock); |
| } else { |
| x->km.state = XFRM_STATE_DEAD; |
| to_put = x; |
| x = NULL; |
| error = -ESRCH; |
| } |
| } |
| out: |
| if (x) { |
| if (!xfrm_state_hold_rcu(x)) { |
| *err = -EAGAIN; |
| x = NULL; |
| } |
| } else { |
| *err = acquire_in_progress ? -EAGAIN : error; |
| } |
| rcu_read_unlock(); |
| if (to_put) |
| xfrm_state_put(to_put); |
| |
| if (read_seqcount_retry(&xfrm_state_hash_generation, sequence)) { |
| *err = -EAGAIN; |
| if (x) { |
| xfrm_state_put(x); |
| x = NULL; |
| } |
| } |
| |
| return x; |
| } |
| |
| struct xfrm_state * |
| xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, |
| 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->if_id == if_id && |
| !(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_rcu(&x->bydst, net->xfrm.state_bydst + h); |
| |
| h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); |
| hlist_add_head_rcu(&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_rcu(&x->byspi, net->xfrm.state_byspi + h); |
| } |
| |
| hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT); |
| 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; |
| u32 if_id = xnew->if_id; |
| |
| 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 && |
| x->if_id == if_id && |
| (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, u32 if_id, 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->if_id = if_id; |
| 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); |
| hrtimer_start(&x->mtimer, |
| ktime_set(net->xfrm.sysctl_acq_expires, 0), |
| HRTIMER_MODE_REL_SOFT); |
| list_add(&x->km.all, &net->xfrm.state_all); |
| hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h); |
| h = xfrm_src_hash(net, daddr, saddr, family); |
| hlist_add_head_rcu(&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->if_id, 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 xfrm_encap_tmpl *encap) |
| { |
| 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); |
| x->geniv = orig->geniv; |
| 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 (encap || orig->encap) { |
| if (encap) |
| x->encap = kmemdup(encap, sizeof(*x->encap), |
| GFP_KERNEL); |
| else |
| 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->if_id = orig->if_id; |
| 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; |
| x->replay = orig->replay; |
| x->preplay = orig->preplay; |
| |
| 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_encap_tmpl *encap) |
| { |
| struct xfrm_state *xc; |
| |
| xc = xfrm_state_clone(x, encap); |
| 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 && |
| x->encap->encap_type == x1->encap->encap_type) |
| memcpy(x1->encap, x->encap, sizeof(*x1->encap)); |
| else if (x->encap || x1->encap) |
| goto fail; |
| |
| 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; |
| |
| hrtimer_start(&x1->mtimer, ktime_set(1, 0), |
| HRTIMER_MODE_REL_SOFT); |
| if (x1->curlft.use_time) |
| xfrm_state_check_expire(x1); |
| |
| if (x->props.smark.m || x->props.smark.v || x->if_id) { |
| spin_lock_bh(&net->xfrm.xfrm_state_lock); |
| |
| if (x->props.smark.m || x->props.smark.v) |
| x1->props.smark = x->props.smark; |
| |
| if (x->if_id) |
| x1->if_id = x->if_id; |
| |
| __xfrm_state_bump_genids(x1); |
| spin_unlock_bh(&net->xfrm.xfrm_state_lock); |
| } |
| |
| err = 0; |
| x->km.state = XFRM_STATE_DEAD; |
| __xfrm_state_put(x); |
| } |
| |
| fail: |
| 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 = ktime_get_real_seconds(); |
| |
| if (x->curlft.bytes >= x->lft.hard_byte_limit || |
| x->curlft.packets >= x->lft.hard_packet_limit) { |
| x->km.state = XFRM_STATE_EXPIRED; |
| hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT); |
| 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; |
| |
| rcu_read_lock(); |
| x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family); |
| rcu_read_unlock(); |
| 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, |
| u32 if_id, 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, if_id, 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 i; |
| 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); |
| else |
| for (i = 0; i < n; i++) |
| dst[i] = src[i]; |
| spin_unlock_bh(&net->xfrm.xfrm_state_lock); |
| rcu_read_unlock(); |
| 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 i; |
| 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); |
| else |
| for (i = 0; i < n; i++) |
| dst[i] = src[i]; |
| spin_unlock_bh(&net->xfrm.xfrm_state_lock); |
| rcu_read_unlock(); |
| 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_rcu(&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_first_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(struct timer_list *t) |
| { |
| struct xfrm_state *x = from_timer(x, t, rtimer); |
| |
| 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, |
| const struct xfrm_encap_tmpl *encap) |
| { |
| 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, |
| encap); |
| 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 (in_compat_syscall()) |
| return -EOPNOTSUPP; |
| |
| if (!optval && !optlen) { |
| xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL); |
| xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL); |
| __sk_dst_reset(sk); |
| return 0; |
| } |
| |
| if (optlen <= 0 || optlen > PAGE_SIZE) |
| return -EMSGSIZE; |
| |
| data = memdup_user(optval, optlen); |
| if (IS_ERR(data)) |
| return PTR_ERR(data); |
| |
| 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); |
| __sk_dst_reset(sk); |
| err = 0; |
| } |
| |
| 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 (WARN_ON(afinfo->family >= NPROTO)) |
| return -EAFNOSUPPORT; |
| |
| spin_lock_bh(&xfrm_state_afinfo_lock); |
| if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) |
| err = -EEXIST; |
| 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, family = afinfo->family; |
| |
| if (WARN_ON(family >= NPROTO)) |
| return -EAFNOSUPPORT; |
| |
| spin_lock_bh(&xfrm_state_afinfo_lock); |
| if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { |
| if (rcu_access_pointer(xfrm_state_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_afinfo_get_rcu(unsigned int family) |
| { |
| if (unlikely(family >= NPROTO)) |
| return NULL; |
| |
| return rcu_dereference(xfrm_state_afinfo[family]); |
| } |
| |
| 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_flush_gc(void) |
| { |
| flush_work(&xfrm_state_gc_work); |
| } |
| EXPORT_SYMBOL(xfrm_flush_gc); |
| |
| /* 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_sync(t); |
| x->tunnel = NULL; |
| } |
| } |
| EXPORT_SYMBOL(xfrm_state_delete_tunnel); |
| |
| int xfrm_state_mtu(struct xfrm_state *x, int mtu) |
| { |
| const struct xfrm_type *type = READ_ONCE(x->type); |
| |
| if (x->km.state == XFRM_STATE_VALID && |
| type && type->get_mtu) |
| return type->get_mtu(x, mtu); |
| |
| return mtu - x->props.header_len; |
| } |
| |
| int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload) |
| { |
| 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); |
| |
| rcu_read_unlock(); |
| |
| 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; |
| |
| x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload); |
| |
| 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; |
| } |
| |
| error: |
| return err; |
| } |
| |
| EXPORT_SYMBOL(__xfrm_init_state); |
| |
| int xfrm_init_state(struct xfrm_state *x) |
| { |
| int err; |
| |
| err = __xfrm_init_state(x, true, false); |
| if (!err) |
| x->km.state = XFRM_STATE_VALID; |
| |
| return err; |
| } |
| |
| EXPORT_SYMBOL(xfrm_init_state); |
| |
| int __net_init xfrm_state_init(struct net *net) |
| { |
| unsigned int sz; |
| |
| if (net_eq(net, &init_net)) |
| xfrm_state_cache = KMEM_CACHE(xfrm_state, |
| SLAB_HWCACHE_ALIGN | SLAB_PANIC); |
| |
| 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); |
| 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); |
| flush_work(&xfrm_state_gc_work); |
| xfrm_state_flush(net, 0, false, true); |
| |
| 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 */ |