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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * 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 <crypto/aead.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 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(&net->xfrm.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(&net->xfrm.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);
- static bool km_is_alive(const struct km_event *c);
- void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
- int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
- {
- struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
- int err = 0;
- if (!afinfo)
- return -EAFNOSUPPORT;
- #define X(afi, T, name) do { \
- WARN_ON((afi)->type_ ## name); \
- (afi)->type_ ## name = (T); \
- } while (0)
- switch (type->proto) {
- case IPPROTO_COMP:
- X(afinfo, type, comp);
- break;
- case IPPROTO_AH:
- X(afinfo, type, ah);
- break;
- case IPPROTO_ESP:
- X(afinfo, type, esp);
- break;
- case IPPROTO_IPIP:
- X(afinfo, type, ipip);
- break;
- case IPPROTO_DSTOPTS:
- X(afinfo, type, dstopts);
- break;
- case IPPROTO_ROUTING:
- X(afinfo, type, routing);
- break;
- case IPPROTO_IPV6:
- X(afinfo, type, ipip6);
- break;
- default:
- WARN_ON(1);
- err = -EPROTONOSUPPORT;
- break;
- }
- #undef X
- rcu_read_unlock();
- return err;
- }
- EXPORT_SYMBOL(xfrm_register_type);
- void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
- {
- struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
- if (unlikely(afinfo == NULL))
- return;
- #define X(afi, T, name) do { \
- WARN_ON((afi)->type_ ## name != (T)); \
- (afi)->type_ ## name = NULL; \
- } while (0)
- switch (type->proto) {
- case IPPROTO_COMP:
- X(afinfo, type, comp);
- break;
- case IPPROTO_AH:
- X(afinfo, type, ah);
- break;
- case IPPROTO_ESP:
- X(afinfo, type, esp);
- break;
- case IPPROTO_IPIP:
- X(afinfo, type, ipip);
- break;
- case IPPROTO_DSTOPTS:
- X(afinfo, type, dstopts);
- break;
- case IPPROTO_ROUTING:
- X(afinfo, type, routing);
- break;
- case IPPROTO_IPV6:
- X(afinfo, type, ipip6);
- break;
- default:
- WARN_ON(1);
- break;
- }
- #undef X
- rcu_read_unlock();
- }
- EXPORT_SYMBOL(xfrm_unregister_type);
- static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
- {
- const struct xfrm_type *type = NULL;
- struct xfrm_state_afinfo *afinfo;
- int modload_attempted = 0;
- retry:
- afinfo = xfrm_state_get_afinfo(family);
- if (unlikely(afinfo == NULL))
- return NULL;
- switch (proto) {
- case IPPROTO_COMP:
- type = afinfo->type_comp;
- break;
- case IPPROTO_AH:
- type = afinfo->type_ah;
- break;
- case IPPROTO_ESP:
- type = afinfo->type_esp;
- break;
- case IPPROTO_IPIP:
- type = afinfo->type_ipip;
- break;
- case IPPROTO_DSTOPTS:
- type = afinfo->type_dstopts;
- break;
- case IPPROTO_ROUTING:
- type = afinfo->type_routing;
- break;
- case IPPROTO_IPV6:
- type = afinfo->type_ipip6;
- break;
- default:
- break;
- }
- 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);
- }
- int xfrm_register_type_offload(const struct xfrm_type_offload *type,
- unsigned short family)
- {
- struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
- int err = 0;
- if (unlikely(afinfo == NULL))
- return -EAFNOSUPPORT;
- switch (type->proto) {
- case IPPROTO_ESP:
- WARN_ON(afinfo->type_offload_esp);
- afinfo->type_offload_esp = type;
- break;
- default:
- WARN_ON(1);
- err = -EPROTONOSUPPORT;
- break;
- }
- rcu_read_unlock();
- return err;
- }
- EXPORT_SYMBOL(xfrm_register_type_offload);
- void xfrm_unregister_type_offload(const struct xfrm_type_offload *type,
- unsigned short family)
- {
- struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
- if (unlikely(afinfo == NULL))
- return;
- switch (type->proto) {
- case IPPROTO_ESP:
- WARN_ON(afinfo->type_offload_esp != type);
- afinfo->type_offload_esp = NULL;
- break;
- default:
- WARN_ON(1);
- break;
- }
- rcu_read_unlock();
- }
- EXPORT_SYMBOL(xfrm_unregister_type_offload);
- static const struct xfrm_type_offload *
- xfrm_get_type_offload(u8 proto, unsigned short family, bool try_load)
- {
- const struct xfrm_type_offload *type = NULL;
- struct xfrm_state_afinfo *afinfo;
- retry:
- afinfo = xfrm_state_get_afinfo(family);
- if (unlikely(afinfo == NULL))
- return NULL;
- switch (proto) {
- case IPPROTO_ESP:
- type = afinfo->type_offload_esp;
- break;
- default:
- break;
- }
- 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 const struct xfrm_mode xfrm4_mode_map[XFRM_MODE_MAX] = {
- [XFRM_MODE_BEET] = {
- .encap = XFRM_MODE_BEET,
- .flags = XFRM_MODE_FLAG_TUNNEL,
- .family = AF_INET,
- },
- [XFRM_MODE_TRANSPORT] = {
- .encap = XFRM_MODE_TRANSPORT,
- .family = AF_INET,
- },
- [XFRM_MODE_TUNNEL] = {
- .encap = XFRM_MODE_TUNNEL,
- .flags = XFRM_MODE_FLAG_TUNNEL,
- .family = AF_INET,
- },
- };
- static const struct xfrm_mode xfrm6_mode_map[XFRM_MODE_MAX] = {
- [XFRM_MODE_BEET] = {
- .encap = XFRM_MODE_BEET,
- .flags = XFRM_MODE_FLAG_TUNNEL,
- .family = AF_INET6,
- },
- [XFRM_MODE_ROUTEOPTIMIZATION] = {
- .encap = XFRM_MODE_ROUTEOPTIMIZATION,
- .family = AF_INET6,
- },
- [XFRM_MODE_TRANSPORT] = {
- .encap = XFRM_MODE_TRANSPORT,
- .family = AF_INET6,
- },
- [XFRM_MODE_TUNNEL] = {
- .encap = XFRM_MODE_TUNNEL,
- .flags = XFRM_MODE_FLAG_TUNNEL,
- .family = AF_INET6,
- },
- };
- static const struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
- {
- const struct xfrm_mode *mode;
- if (unlikely(encap >= XFRM_MODE_MAX))
- return NULL;
- switch (family) {
- case AF_INET:
- mode = &xfrm4_mode_map[encap];
- if (mode->family == family)
- return mode;
- break;
- case AF_INET6:
- mode = &xfrm6_mode_map[encap];
- if (mode->family == family)
- return mode;
- break;
- default:
- break;
- }
- return NULL;
- }
- 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->type_offload)
- xfrm_put_type_offload(x->type_offload);
- if (x->type) {
- x->type->destructor(x);
- xfrm_put_type(x->type);
- }
- if (x->xfrag.page)
- put_page(x->xfrag.page);
- 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_zalloc(xfrm_state_cache, GFP_ATOMIC);
- 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;
- 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);
- if (x->encap_sk)
- sock_put(rcu_dereference_raw(x->encap_sk));
- 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
- __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
- {
- const struct flowi4 *fl4 = &fl->u.ip4;
- sel->daddr.a4 = fl4->daddr;
- sel->saddr.a4 = fl4->saddr;
- sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
- sel->dport_mask = htons(0xffff);
- sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
- sel->sport_mask = htons(0xffff);
- sel->family = AF_INET;
- sel->prefixlen_d = 32;
- sel->prefixlen_s = 32;
- sel->proto = fl4->flowi4_proto;
- sel->ifindex = fl4->flowi4_oif;
- }
- static void
- __xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
- {
- const struct flowi6 *fl6 = &fl->u.ip6;
- /* Initialize temporary selector matching only to current session. */
- *(struct in6_addr *)&sel->daddr = fl6->daddr;
- *(struct in6_addr *)&sel->saddr = fl6->saddr;
- sel->dport = xfrm_flowi_dport(fl, &fl6->uli);
- sel->dport_mask = htons(0xffff);
- sel->sport = xfrm_flowi_sport(fl, &fl6->uli);
- sel->sport_mask = htons(0xffff);
- sel->family = AF_INET6;
- sel->prefixlen_d = 128;
- sel->prefixlen_s = 128;
- sel->proto = fl6->flowi6_proto;
- sel->ifindex = fl6->flowi6_oif;
- }
- 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)
- {
- switch (family) {
- case AF_INET:
- __xfrm4_init_tempsel(&x->sel, fl);
- break;
- case AF_INET6:
- __xfrm6_init_tempsel(&x->sel, fl);
- break;
- }
- x->id = tmpl->id;
- switch (tmpl->encap_family) {
- case AF_INET:
- if (x->id.daddr.a4 == 0)
- x->id.daddr.a4 = daddr->a4;
- x->props.saddr = tmpl->saddr;
- if (x->props.saddr.a4 == 0)
- x->props.saddr.a4 = saddr->a4;
- break;
- case AF_INET6:
- if (ipv6_addr_any((struct in6_addr *)&x->id.daddr))
- memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
- memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
- if (ipv6_addr_any((struct in6_addr *)&x->props.saddr))
- memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
- break;
- }
- x->props.mode = tmpl->mode;
- x->props.reqid = tmpl->reqid;
- x->props.family = tmpl->encap_family;
- }
- 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 &&
- (x->sel.family != family ||
- !xfrm_selector_match(&x->sel, fl, 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 ((!x->sel.family ||
- (x->sel.family == family &&
- xfrm_selector_match(&x->sel, fl, 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(&net->xfrm.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, 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, 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(&net->xfrm.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 inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security)
- {
- struct xfrm_user_sec_ctx *uctx;
- int size = sizeof(*uctx) + security->ctx_len;
- int err;
- uctx = kmalloc(size, GFP_KERNEL);
- if (!uctx)
- return -ENOMEM;
- uctx->exttype = XFRMA_SEC_CTX;
- uctx->len = size;
- uctx->ctx_doi = security->ctx_doi;
- uctx->ctx_alg = security->ctx_alg;
- uctx->ctx_len = security->ctx_len;
- memcpy(uctx + 1, security->ctx_str, security->ctx_len);
- err = security_xfrm_state_alloc(x, uctx);
- kfree(uctx);
- if (err)
- return err;
- return 0;
- }
- 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->security)
- if (clone_security(x, orig->security))
- 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));
- memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark));
- 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;
- memcpy(&x->curlft, &orig->curlft, sizeof(x->curlft));
- 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,
- u32 if_id)
- {
- 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 (if_id != 0 && x->if_id != if_id)
- 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 (if_id != 0 && x->if_id != if_id)
- 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;
- xc->props.family = m->new_family;
- if (xfrm_init_state(xc) < 0)
- goto error;
- 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
- #if IS_ENABLED(CONFIG_IPV6)
- /* distribution counting sort function for xfrm_state and xfrm_tmpl */
- static void
- __xfrm6_sort(void **dst, void **src, int n,
- int (*cmp)(const void *p), int maxclass)
- {
- int count[XFRM_MAX_DEPTH] = { };
- int class[XFRM_MAX_DEPTH];
- int i;
- for (i = 0; i < n; i++) {
- int c = cmp(src[i]);
- class[i] = c;
- count[c]++;
- }
- for (i = 2; i < maxclass; i++)
- count[i] += count[i - 1];
- for (i = 0; i < n; i++) {
- dst[count[class[i] - 1]++] = src[i];
- src[i] = NULL;
- }
- }
- /* Rule for xfrm_state:
- *
- * rule 1: select IPsec transport except AH
- * rule 2: select MIPv6 RO or inbound trigger
- * rule 3: select IPsec transport AH
- * rule 4: select IPsec tunnel
- * rule 5: others
- */
- static int __xfrm6_state_sort_cmp(const void *p)
- {
- const struct xfrm_state *v = p;
- switch (v->props.mode) {
- case XFRM_MODE_TRANSPORT:
- if (v->id.proto != IPPROTO_AH)
- return 1;
- else
- return 3;
- #if IS_ENABLED(CONFIG_IPV6_MIP6)
- case XFRM_MODE_ROUTEOPTIMIZATION:
- case XFRM_MODE_IN_TRIGGER:
- return 2;
- #endif
- case XFRM_MODE_TUNNEL:
- case XFRM_MODE_BEET:
- return 4;
- }
- return 5;
- }
- /* Rule for xfrm_tmpl:
- *
- * rule 1: select IPsec transport
- * rule 2: select MIPv6 RO or inbound trigger
- * rule 3: select IPsec tunnel
- * rule 4: others
- */
- static int __xfrm6_tmpl_sort_cmp(const void *p)
- {
- const struct xfrm_tmpl *v = p;
- switch (v->mode) {
- case XFRM_MODE_TRANSPORT:
- return 1;
- #if IS_ENABLED(CONFIG_IPV6_MIP6)
- case XFRM_MODE_ROUTEOPTIMIZATION:
- case XFRM_MODE_IN_TRIGGER:
- return 2;
- #endif
- case XFRM_MODE_TUNNEL:
- case XFRM_MODE_BEET:
- return 3;
- }
- return 4;
- }
- #else
- static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; }
- static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; }
- static inline void
- __xfrm6_sort(void **dst, void **src, int n,
- int (*cmp)(const void *p), int maxclass)
- {
- int i;
- for (i = 0; i < n; i++)
- dst[i] = src[i];
- }
- #endif /* CONFIG_IPV6 */
- void
- xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
- unsigned short family)
- {
- int i;
- if (family == AF_INET6)
- __xfrm6_sort((void **)dst, (void **)src, n,
- __xfrm6_tmpl_sort_cmp, 5);
- else
- for (i = 0; i < n; i++)
- dst[i] = src[i];
- }
- void
- xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
- unsigned short family)
- {
- int i;
- if (family == AF_INET6)
- __xfrm6_sort((void **)dst, (void **)src, n,
- __xfrm6_state_sort_cmp, 6);
- else
- for (i = 0; i < n; i++)
- dst[i] = src[i];
- }
- #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);
- __be32 newspi = 0;
- 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;
- }
- newspi = 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) {
- newspi = htonl(spi);
- break;
- }
- xfrm_state_put(x0);
- }
- }
- if (newspi) {
- spin_lock_bh(&net->xfrm.xfrm_state_lock);
- x->id.spi = newspi;
- 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);
- static 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;
- }
- #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
- static DEFINE_SPINLOCK(xfrm_translator_lock);
- static struct xfrm_translator __rcu *xfrm_translator;
- struct xfrm_translator *xfrm_get_translator(void)
- {
- struct xfrm_translator *xtr;
- rcu_read_lock();
- xtr = rcu_dereference(xfrm_translator);
- if (unlikely(!xtr))
- goto out;
- if (!try_module_get(xtr->owner))
- xtr = NULL;
- out:
- rcu_read_unlock();
- return xtr;
- }
- EXPORT_SYMBOL_GPL(xfrm_get_translator);
- void xfrm_put_translator(struct xfrm_translator *xtr)
- {
- module_put(xtr->owner);
- }
- EXPORT_SYMBOL_GPL(xfrm_put_translator);
- int xfrm_register_translator(struct xfrm_translator *xtr)
- {
- int err = 0;
- spin_lock_bh(&xfrm_translator_lock);
- if (unlikely(xfrm_translator != NULL))
- err = -EEXIST;
- else
- rcu_assign_pointer(xfrm_translator, xtr);
- spin_unlock_bh(&xfrm_translator_lock);
- return err;
- }
- EXPORT_SYMBOL_GPL(xfrm_register_translator);
- int xfrm_unregister_translator(struct xfrm_translator *xtr)
- {
- int err = 0;
- spin_lock_bh(&xfrm_translator_lock);
- if (likely(xfrm_translator != NULL)) {
- if (rcu_access_pointer(xfrm_translator) != xtr)
- err = -EINVAL;
- else
- RCU_INIT_POINTER(xfrm_translator, NULL);
- }
- spin_unlock_bh(&xfrm_translator_lock);
- synchronize_rcu();
- return err;
- }
- EXPORT_SYMBOL_GPL(xfrm_unregister_translator);
- #endif
- int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen)
- {
- int err;
- u8 *data;
- struct xfrm_mgr *km;
- struct xfrm_policy *pol = NULL;
- if (sockptr_is_null(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_sockptr(optval, optlen);
- if (IS_ERR(data))
- return PTR_ERR(data);
- /* Use the 64-bit / untranslated format on Android, even for compat */
- if (!IS_ENABLED(CONFIG_ANDROID) || IS_ENABLED(CONFIG_XFRM_USER_COMPAT)) {
- if (in_compat_syscall()) {
- struct xfrm_translator *xtr = xfrm_get_translator();
- if (!xtr) {
- kfree(data);
- return -EOPNOTSUPP;
- }
- err = xtr->xlate_user_policy_sockptr(&data, optlen);
- xfrm_put_translator(xtr);
- if (err) {
- kfree(data);
- return err;
- }
- }
- }
- 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]);
- }
- EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu);
- 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);
- u32 xfrm_state_mtu(struct xfrm_state *x, int mtu)
- {
- const struct xfrm_type *type = READ_ONCE(x->type);
- struct crypto_aead *aead;
- u32 blksize, net_adj = 0;
- if (x->km.state != XFRM_STATE_VALID ||
- !type || type->proto != IPPROTO_ESP)
- return mtu - x->props.header_len;
- aead = x->data;
- blksize = ALIGN(crypto_aead_blocksize(aead), 4);
- switch (x->props.mode) {
- case XFRM_MODE_TRANSPORT:
- case XFRM_MODE_BEET:
- if (x->props.family == AF_INET)
- net_adj = sizeof(struct iphdr);
- else if (x->props.family == AF_INET6)
- net_adj = sizeof(struct ipv6hdr);
- break;
- case XFRM_MODE_TUNNEL:
- break;
- default:
- WARN_ON_ONCE(1);
- break;
- }
- return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
- net_adj) & ~(blksize - 1)) + net_adj - 2;
- }
- EXPORT_SYMBOL_GPL(xfrm_state_mtu);
- int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload)
- {
- const struct xfrm_mode *inner_mode;
- const struct xfrm_mode *outer_mode;
- int family = x->props.family;
- int err;
- if (family == AF_INET &&
- xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc)
- x->props.flags |= XFRM_STATE_NOPMTUDISC;
- 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)
- goto error;
- x->inner_mode = *inner_mode;
- } else {
- const 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))
- 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;
- }
- }
- 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;
- outer_mode = xfrm_get_mode(x->props.mode, family);
- if (!outer_mode) {
- err = -EPROTONOSUPPORT;
- goto error;
- }
- x->outer_mode = *outer_mode;
- 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);
- seqcount_init(&net->xfrm.xfrm_state_hash_generation);
- 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 */
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