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-rw-r--r--net/xfrm/xfrm_policy.c3256
1 files changed, 3256 insertions, 0 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
new file mode 100644
index 000000000..bb1c94e20
--- /dev/null
+++ b/net/xfrm/xfrm_policy.c
@@ -0,0 +1,3256 @@
+/*
+ * xfrm_policy.c
+ *
+ * Changes:
+ * Mitsuru KANDA @USAGI
+ * Kazunori MIYAZAWA @USAGI
+ * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
+ * IPv6 support
+ * Kazunori MIYAZAWA @USAGI
+ * YOSHIFUJI Hideaki
+ * Split up af-specific portion
+ * Derek Atkins <derek@ihtfp.com> Add the post_input processor
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/kmod.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+#include <linux/notifier.h>
+#include <linux/netdevice.h>
+#include <linux/netfilter.h>
+#include <linux/module.h>
+#include <linux/cache.h>
+#include <linux/cpu.h>
+#include <linux/audit.h>
+#include <net/dst.h>
+#include <net/flow.h>
+#include <net/xfrm.h>
+#include <net/ip.h>
+#ifdef CONFIG_XFRM_STATISTICS
+#include <net/snmp.h>
+#endif
+
+#include "xfrm_hash.h"
+
+#define XFRM_QUEUE_TMO_MIN ((unsigned)(HZ/10))
+#define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ))
+#define XFRM_MAX_QUEUE_LEN 100
+
+struct xfrm_flo {
+ struct dst_entry *dst_orig;
+ u8 flags;
+};
+
+static DEFINE_SPINLOCK(xfrm_if_cb_lock);
+static struct xfrm_if_cb const __rcu *xfrm_if_cb __read_mostly;
+
+static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock);
+static struct xfrm_policy_afinfo const __rcu *xfrm_policy_afinfo[AF_INET6 + 1]
+ __read_mostly;
+
+static struct kmem_cache *xfrm_dst_cache __ro_after_init;
+static __read_mostly seqcount_t xfrm_policy_hash_generation;
+
+static void xfrm_init_pmtu(struct xfrm_dst **bundle, int nr);
+static int stale_bundle(struct dst_entry *dst);
+static int xfrm_bundle_ok(struct xfrm_dst *xdst);
+static void xfrm_policy_queue_process(struct timer_list *t);
+
+static void __xfrm_policy_link(struct xfrm_policy *pol, int dir);
+static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
+ int dir);
+
+static inline bool xfrm_pol_hold_rcu(struct xfrm_policy *policy)
+{
+ return refcount_inc_not_zero(&policy->refcnt);
+}
+
+static inline bool
+__xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
+{
+ const struct flowi4 *fl4 = &fl->u.ip4;
+
+ return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) &&
+ addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) &&
+ !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) &&
+ !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) &&
+ (fl4->flowi4_proto == sel->proto || !sel->proto) &&
+ (fl4->flowi4_oif == sel->ifindex || !sel->ifindex);
+}
+
+static inline bool
+__xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
+{
+ const struct flowi6 *fl6 = &fl->u.ip6;
+
+ return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) &&
+ addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) &&
+ !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) &&
+ !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) &&
+ (fl6->flowi6_proto == sel->proto || !sel->proto) &&
+ (fl6->flowi6_oif == sel->ifindex || !sel->ifindex);
+}
+
+bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl,
+ unsigned short family)
+{
+ switch (family) {
+ case AF_INET:
+ return __xfrm4_selector_match(sel, fl);
+ case AF_INET6:
+ return __xfrm6_selector_match(sel, fl);
+ }
+ return false;
+}
+
+static const struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
+{
+ const struct xfrm_policy_afinfo *afinfo;
+
+ if (unlikely(family >= ARRAY_SIZE(xfrm_policy_afinfo)))
+ return NULL;
+ rcu_read_lock();
+ afinfo = rcu_dereference(xfrm_policy_afinfo[family]);
+ if (unlikely(!afinfo))
+ rcu_read_unlock();
+ return afinfo;
+}
+
+/* Called with rcu_read_lock(). */
+static const struct xfrm_if_cb *xfrm_if_get_cb(void)
+{
+ return rcu_dereference(xfrm_if_cb);
+}
+
+struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
+ const xfrm_address_t *saddr,
+ const xfrm_address_t *daddr,
+ int family, u32 mark)
+{
+ const struct xfrm_policy_afinfo *afinfo;
+ struct dst_entry *dst;
+
+ afinfo = xfrm_policy_get_afinfo(family);
+ if (unlikely(afinfo == NULL))
+ return ERR_PTR(-EAFNOSUPPORT);
+
+ dst = afinfo->dst_lookup(net, tos, oif, saddr, daddr, mark);
+
+ rcu_read_unlock();
+
+ return dst;
+}
+EXPORT_SYMBOL(__xfrm_dst_lookup);
+
+static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x,
+ int tos, int oif,
+ xfrm_address_t *prev_saddr,
+ xfrm_address_t *prev_daddr,
+ int family, u32 mark)
+{
+ struct net *net = xs_net(x);
+ xfrm_address_t *saddr = &x->props.saddr;
+ xfrm_address_t *daddr = &x->id.daddr;
+ struct dst_entry *dst;
+
+ if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
+ saddr = x->coaddr;
+ daddr = prev_daddr;
+ }
+ if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
+ saddr = prev_saddr;
+ daddr = x->coaddr;
+ }
+
+ dst = __xfrm_dst_lookup(net, tos, oif, saddr, daddr, family, mark);
+
+ if (!IS_ERR(dst)) {
+ if (prev_saddr != saddr)
+ memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
+ if (prev_daddr != daddr)
+ memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
+ }
+
+ return dst;
+}
+
+static inline unsigned long make_jiffies(long secs)
+{
+ if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
+ return MAX_SCHEDULE_TIMEOUT-1;
+ else
+ return secs*HZ;
+}
+
+static void xfrm_policy_timer(struct timer_list *t)
+{
+ struct xfrm_policy *xp = from_timer(xp, t, timer);
+ time64_t now = ktime_get_real_seconds();
+ time64_t next = TIME64_MAX;
+ int warn = 0;
+ int dir;
+
+ read_lock(&xp->lock);
+
+ if (unlikely(xp->walk.dead))
+ goto out;
+
+ dir = xfrm_policy_id2dir(xp->index);
+
+ if (xp->lft.hard_add_expires_seconds) {
+ time64_t tmo = xp->lft.hard_add_expires_seconds +
+ xp->curlft.add_time - now;
+ if (tmo <= 0)
+ goto expired;
+ if (tmo < next)
+ next = tmo;
+ }
+ if (xp->lft.hard_use_expires_seconds) {
+ time64_t tmo = xp->lft.hard_use_expires_seconds +
+ (xp->curlft.use_time ? : xp->curlft.add_time) - now;
+ if (tmo <= 0)
+ goto expired;
+ if (tmo < next)
+ next = tmo;
+ }
+ if (xp->lft.soft_add_expires_seconds) {
+ time64_t tmo = xp->lft.soft_add_expires_seconds +
+ xp->curlft.add_time - now;
+ if (tmo <= 0) {
+ warn = 1;
+ tmo = XFRM_KM_TIMEOUT;
+ }
+ if (tmo < next)
+ next = tmo;
+ }
+ if (xp->lft.soft_use_expires_seconds) {
+ time64_t tmo = xp->lft.soft_use_expires_seconds +
+ (xp->curlft.use_time ? : xp->curlft.add_time) - now;
+ if (tmo <= 0) {
+ warn = 1;
+ tmo = XFRM_KM_TIMEOUT;
+ }
+ if (tmo < next)
+ next = tmo;
+ }
+
+ if (warn)
+ km_policy_expired(xp, dir, 0, 0);
+ if (next != TIME64_MAX &&
+ !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
+ xfrm_pol_hold(xp);
+
+out:
+ read_unlock(&xp->lock);
+ xfrm_pol_put(xp);
+ return;
+
+expired:
+ read_unlock(&xp->lock);
+ if (!xfrm_policy_delete(xp, dir))
+ km_policy_expired(xp, dir, 1, 0);
+ xfrm_pol_put(xp);
+}
+
+/* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
+ * SPD calls.
+ */
+
+struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
+{
+ struct xfrm_policy *policy;
+
+ policy = kzalloc(sizeof(struct xfrm_policy), gfp);
+
+ if (policy) {
+ write_pnet(&policy->xp_net, net);
+ INIT_LIST_HEAD(&policy->walk.all);
+ INIT_HLIST_NODE(&policy->bydst);
+ INIT_HLIST_NODE(&policy->byidx);
+ rwlock_init(&policy->lock);
+ refcount_set(&policy->refcnt, 1);
+ skb_queue_head_init(&policy->polq.hold_queue);
+ timer_setup(&policy->timer, xfrm_policy_timer, 0);
+ timer_setup(&policy->polq.hold_timer,
+ xfrm_policy_queue_process, 0);
+ }
+ return policy;
+}
+EXPORT_SYMBOL(xfrm_policy_alloc);
+
+static void xfrm_policy_destroy_rcu(struct rcu_head *head)
+{
+ struct xfrm_policy *policy = container_of(head, struct xfrm_policy, rcu);
+
+ security_xfrm_policy_free(policy->security);
+ kfree(policy);
+}
+
+/* Destroy xfrm_policy: descendant resources must be released to this moment. */
+
+void xfrm_policy_destroy(struct xfrm_policy *policy)
+{
+ BUG_ON(!policy->walk.dead);
+
+ if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer))
+ BUG();
+
+ call_rcu(&policy->rcu, xfrm_policy_destroy_rcu);
+}
+EXPORT_SYMBOL(xfrm_policy_destroy);
+
+/* Rule must be locked. Release descendant resources, announce
+ * entry dead. The rule must be unlinked from lists to the moment.
+ */
+
+static void xfrm_policy_kill(struct xfrm_policy *policy)
+{
+ write_lock_bh(&policy->lock);
+ policy->walk.dead = 1;
+ write_unlock_bh(&policy->lock);
+
+ atomic_inc(&policy->genid);
+
+ if (del_timer(&policy->polq.hold_timer))
+ xfrm_pol_put(policy);
+ skb_queue_purge(&policy->polq.hold_queue);
+
+ if (del_timer(&policy->timer))
+ xfrm_pol_put(policy);
+
+ xfrm_pol_put(policy);
+}
+
+static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
+
+static inline unsigned int idx_hash(struct net *net, u32 index)
+{
+ return __idx_hash(index, net->xfrm.policy_idx_hmask);
+}
+
+/* calculate policy hash thresholds */
+static void __get_hash_thresh(struct net *net,
+ unsigned short family, int dir,
+ u8 *dbits, u8 *sbits)
+{
+ switch (family) {
+ case AF_INET:
+ *dbits = net->xfrm.policy_bydst[dir].dbits4;
+ *sbits = net->xfrm.policy_bydst[dir].sbits4;
+ break;
+
+ case AF_INET6:
+ *dbits = net->xfrm.policy_bydst[dir].dbits6;
+ *sbits = net->xfrm.policy_bydst[dir].sbits6;
+ break;
+
+ default:
+ *dbits = 0;
+ *sbits = 0;
+ }
+}
+
+static struct hlist_head *policy_hash_bysel(struct net *net,
+ const struct xfrm_selector *sel,
+ unsigned short family, int dir)
+{
+ unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
+ unsigned int hash;
+ u8 dbits;
+ u8 sbits;
+
+ __get_hash_thresh(net, family, dir, &dbits, &sbits);
+ hash = __sel_hash(sel, family, hmask, dbits, sbits);
+
+ if (hash == hmask + 1)
+ return &net->xfrm.policy_inexact[dir];
+
+ return rcu_dereference_check(net->xfrm.policy_bydst[dir].table,
+ lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash;
+}
+
+static struct hlist_head *policy_hash_direct(struct net *net,
+ const xfrm_address_t *daddr,
+ const xfrm_address_t *saddr,
+ unsigned short family, int dir)
+{
+ unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
+ unsigned int hash;
+ u8 dbits;
+ u8 sbits;
+
+ __get_hash_thresh(net, family, dir, &dbits, &sbits);
+ hash = __addr_hash(daddr, saddr, family, hmask, dbits, sbits);
+
+ return rcu_dereference_check(net->xfrm.policy_bydst[dir].table,
+ lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash;
+}
+
+static void xfrm_dst_hash_transfer(struct net *net,
+ struct hlist_head *list,
+ struct hlist_head *ndsttable,
+ unsigned int nhashmask,
+ int dir)
+{
+ struct hlist_node *tmp, *entry0 = NULL;
+ struct xfrm_policy *pol;
+ unsigned int h0 = 0;
+ u8 dbits;
+ u8 sbits;
+
+redo:
+ hlist_for_each_entry_safe(pol, tmp, list, bydst) {
+ unsigned int h;
+
+ __get_hash_thresh(net, pol->family, dir, &dbits, &sbits);
+ h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
+ pol->family, nhashmask, dbits, sbits);
+ if (!entry0) {
+ hlist_del_rcu(&pol->bydst);
+ hlist_add_head_rcu(&pol->bydst, ndsttable + h);
+ h0 = h;
+ } else {
+ if (h != h0)
+ continue;
+ hlist_del_rcu(&pol->bydst);
+ hlist_add_behind_rcu(&pol->bydst, entry0);
+ }
+ entry0 = &pol->bydst;
+ }
+ if (!hlist_empty(list)) {
+ entry0 = NULL;
+ goto redo;
+ }
+}
+
+static void xfrm_idx_hash_transfer(struct hlist_head *list,
+ struct hlist_head *nidxtable,
+ unsigned int nhashmask)
+{
+ struct hlist_node *tmp;
+ struct xfrm_policy *pol;
+
+ hlist_for_each_entry_safe(pol, tmp, list, byidx) {
+ unsigned int h;
+
+ h = __idx_hash(pol->index, nhashmask);
+ hlist_add_head(&pol->byidx, nidxtable+h);
+ }
+}
+
+static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
+{
+ return ((old_hmask + 1) << 1) - 1;
+}
+
+static void xfrm_bydst_resize(struct net *net, int dir)
+{
+ unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
+ unsigned int nhashmask = xfrm_new_hash_mask(hmask);
+ unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
+ struct hlist_head *ndst = xfrm_hash_alloc(nsize);
+ struct hlist_head *odst;
+ int i;
+
+ if (!ndst)
+ return;
+
+ spin_lock_bh(&net->xfrm.xfrm_policy_lock);
+ write_seqcount_begin(&xfrm_policy_hash_generation);
+
+ odst = rcu_dereference_protected(net->xfrm.policy_bydst[dir].table,
+ lockdep_is_held(&net->xfrm.xfrm_policy_lock));
+
+ odst = rcu_dereference_protected(net->xfrm.policy_bydst[dir].table,
+ lockdep_is_held(&net->xfrm.xfrm_policy_lock));
+
+ for (i = hmask; i >= 0; i--)
+ xfrm_dst_hash_transfer(net, odst + i, ndst, nhashmask, dir);
+
+ rcu_assign_pointer(net->xfrm.policy_bydst[dir].table, ndst);
+ net->xfrm.policy_bydst[dir].hmask = nhashmask;
+
+ write_seqcount_end(&xfrm_policy_hash_generation);
+ spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
+
+ synchronize_rcu();
+
+ xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
+}
+
+static void xfrm_byidx_resize(struct net *net, int total)
+{
+ unsigned int hmask = net->xfrm.policy_idx_hmask;
+ unsigned int nhashmask = xfrm_new_hash_mask(hmask);
+ unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
+ struct hlist_head *oidx = net->xfrm.policy_byidx;
+ struct hlist_head *nidx = xfrm_hash_alloc(nsize);
+ int i;
+
+ if (!nidx)
+ return;
+
+ spin_lock_bh(&net->xfrm.xfrm_policy_lock);
+
+ for (i = hmask; i >= 0; i--)
+ xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
+
+ net->xfrm.policy_byidx = nidx;
+ net->xfrm.policy_idx_hmask = nhashmask;
+
+ spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
+
+ xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
+}
+
+static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
+{
+ unsigned int cnt = net->xfrm.policy_count[dir];
+ unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
+
+ if (total)
+ *total += cnt;
+
+ if ((hmask + 1) < xfrm_policy_hashmax &&
+ cnt > hmask)
+ return 1;
+
+ return 0;
+}
+
+static inline int xfrm_byidx_should_resize(struct net *net, int total)
+{
+ unsigned int hmask = net->xfrm.policy_idx_hmask;
+
+ if ((hmask + 1) < xfrm_policy_hashmax &&
+ total > hmask)
+ return 1;
+
+ return 0;
+}
+
+void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
+{
+ si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
+ si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
+ si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
+ si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
+ si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
+ si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
+ si->spdhcnt = net->xfrm.policy_idx_hmask;
+ si->spdhmcnt = xfrm_policy_hashmax;
+}
+EXPORT_SYMBOL(xfrm_spd_getinfo);
+
+static DEFINE_MUTEX(hash_resize_mutex);
+static void xfrm_hash_resize(struct work_struct *work)
+{
+ struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
+ int dir, total;
+
+ mutex_lock(&hash_resize_mutex);
+
+ total = 0;
+ for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
+ if (xfrm_bydst_should_resize(net, dir, &total))
+ xfrm_bydst_resize(net, dir);
+ }
+ if (xfrm_byidx_should_resize(net, total))
+ xfrm_byidx_resize(net, total);
+
+ mutex_unlock(&hash_resize_mutex);
+}
+
+static void xfrm_hash_rebuild(struct work_struct *work)
+{
+ struct net *net = container_of(work, struct net,
+ xfrm.policy_hthresh.work);
+ unsigned int hmask;
+ struct xfrm_policy *pol;
+ struct xfrm_policy *policy;
+ struct hlist_head *chain;
+ struct hlist_head *odst;
+ struct hlist_node *newpos;
+ int i;
+ int dir;
+ unsigned seq;
+ u8 lbits4, rbits4, lbits6, rbits6;
+
+ mutex_lock(&hash_resize_mutex);
+
+ /* read selector prefixlen thresholds */
+ do {
+ seq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
+
+ lbits4 = net->xfrm.policy_hthresh.lbits4;
+ rbits4 = net->xfrm.policy_hthresh.rbits4;
+ lbits6 = net->xfrm.policy_hthresh.lbits6;
+ rbits6 = net->xfrm.policy_hthresh.rbits6;
+ } while (read_seqretry(&net->xfrm.policy_hthresh.lock, seq));
+
+ spin_lock_bh(&net->xfrm.xfrm_policy_lock);
+
+ /* reset the bydst and inexact table in all directions */
+ for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
+ INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
+ hmask = net->xfrm.policy_bydst[dir].hmask;
+ odst = net->xfrm.policy_bydst[dir].table;
+ for (i = hmask; i >= 0; i--)
+ INIT_HLIST_HEAD(odst + i);
+ if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) {
+ /* dir out => dst = remote, src = local */
+ net->xfrm.policy_bydst[dir].dbits4 = rbits4;
+ net->xfrm.policy_bydst[dir].sbits4 = lbits4;
+ net->xfrm.policy_bydst[dir].dbits6 = rbits6;
+ net->xfrm.policy_bydst[dir].sbits6 = lbits6;
+ } else {
+ /* dir in/fwd => dst = local, src = remote */
+ net->xfrm.policy_bydst[dir].dbits4 = lbits4;
+ net->xfrm.policy_bydst[dir].sbits4 = rbits4;
+ net->xfrm.policy_bydst[dir].dbits6 = lbits6;
+ net->xfrm.policy_bydst[dir].sbits6 = rbits6;
+ }
+ }
+
+ /* re-insert all policies by order of creation */
+ list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) {
+ if (policy->walk.dead ||
+ xfrm_policy_id2dir(policy->index) >= XFRM_POLICY_MAX) {
+ /* skip socket policies */
+ continue;
+ }
+ newpos = NULL;
+ chain = policy_hash_bysel(net, &policy->selector,
+ policy->family,
+ xfrm_policy_id2dir(policy->index));
+ hlist_for_each_entry(pol, chain, bydst) {
+ if (policy->priority >= pol->priority)
+ newpos = &pol->bydst;
+ else
+ break;
+ }
+ if (newpos)
+ hlist_add_behind_rcu(&policy->bydst, newpos);
+ else
+ hlist_add_head_rcu(&policy->bydst, chain);
+ }
+
+ spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
+
+ mutex_unlock(&hash_resize_mutex);
+}
+
+void xfrm_policy_hash_rebuild(struct net *net)
+{
+ schedule_work(&net->xfrm.policy_hthresh.work);
+}
+EXPORT_SYMBOL(xfrm_policy_hash_rebuild);
+
+/* Generate new index... KAME seems to generate them ordered by cost
+ * of an absolute inpredictability of ordering of rules. This will not pass. */
+static u32 xfrm_gen_index(struct net *net, int dir, u32 index)
+{
+ static u32 idx_generator;
+
+ for (;;) {
+ struct hlist_head *list;
+ struct xfrm_policy *p;
+ u32 idx;
+ int found;
+
+ if (!index) {
+ idx = (idx_generator | dir);
+ idx_generator += 8;
+ } else {
+ idx = index;
+ index = 0;
+ }
+
+ if (idx == 0)
+ idx = 8;
+ list = net->xfrm.policy_byidx + idx_hash(net, idx);
+ found = 0;
+ hlist_for_each_entry(p, list, byidx) {
+ if (p->index == idx) {
+ found = 1;
+ break;
+ }
+ }
+ if (!found)
+ return idx;
+ }
+}
+
+static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
+{
+ u32 *p1 = (u32 *) s1;
+ u32 *p2 = (u32 *) s2;
+ int len = sizeof(struct xfrm_selector) / sizeof(u32);
+ int i;
+
+ for (i = 0; i < len; i++) {
+ if (p1[i] != p2[i])
+ return 1;
+ }
+
+ return 0;
+}
+
+static void xfrm_policy_requeue(struct xfrm_policy *old,
+ struct xfrm_policy *new)
+{
+ struct xfrm_policy_queue *pq = &old->polq;
+ struct sk_buff_head list;
+
+ if (skb_queue_empty(&pq->hold_queue))
+ return;
+
+ __skb_queue_head_init(&list);
+
+ spin_lock_bh(&pq->hold_queue.lock);
+ skb_queue_splice_init(&pq->hold_queue, &list);
+ if (del_timer(&pq->hold_timer))
+ xfrm_pol_put(old);
+ spin_unlock_bh(&pq->hold_queue.lock);
+
+ pq = &new->polq;
+
+ spin_lock_bh(&pq->hold_queue.lock);
+ skb_queue_splice(&list, &pq->hold_queue);
+ pq->timeout = XFRM_QUEUE_TMO_MIN;
+ if (!mod_timer(&pq->hold_timer, jiffies))
+ xfrm_pol_hold(new);
+ spin_unlock_bh(&pq->hold_queue.lock);
+}
+
+static inline bool xfrm_policy_mark_match(const struct xfrm_mark *mark,
+ struct xfrm_policy *pol)
+{
+ return mark->v == pol->mark.v && mark->m == pol->mark.m;
+}
+
+int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
+{
+ struct net *net = xp_net(policy);
+ struct xfrm_policy *pol;
+ struct xfrm_policy *delpol;
+ struct hlist_head *chain;
+ struct hlist_node *newpos;
+
+ spin_lock_bh(&net->xfrm.xfrm_policy_lock);
+ chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
+ delpol = NULL;
+ newpos = NULL;
+ hlist_for_each_entry(pol, chain, bydst) {
+ if (pol->type == policy->type &&
+ pol->if_id == policy->if_id &&
+ !selector_cmp(&pol->selector, &policy->selector) &&
+ xfrm_policy_mark_match(&policy->mark, pol) &&
+ xfrm_sec_ctx_match(pol->security, policy->security) &&
+ !WARN_ON(delpol)) {
+ if (excl) {
+ spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
+ return -EEXIST;
+ }
+ delpol = pol;
+ if (policy->priority > pol->priority)
+ continue;
+ } else if (policy->priority >= pol->priority) {
+ newpos = &pol->bydst;
+ continue;
+ }
+ if (delpol)
+ break;
+ }
+ if (newpos)
+ hlist_add_behind_rcu(&policy->bydst, newpos);
+ else
+ hlist_add_head_rcu(&policy->bydst, chain);
+ __xfrm_policy_link(policy, dir);
+
+ /* After previous checking, family can either be AF_INET or AF_INET6 */
+ if (policy->family == AF_INET)
+ rt_genid_bump_ipv4(net);
+ else
+ rt_genid_bump_ipv6(net);
+
+ if (delpol) {
+ xfrm_policy_requeue(delpol, policy);
+ __xfrm_policy_unlink(delpol, dir);
+ }
+ policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index);
+ hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
+ policy->curlft.add_time = ktime_get_real_seconds();
+ policy->curlft.use_time = 0;
+ if (!mod_timer(&policy->timer, jiffies + HZ))
+ xfrm_pol_hold(policy);
+ spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
+
+ if (delpol)
+ xfrm_policy_kill(delpol);
+ else if (xfrm_bydst_should_resize(net, dir, NULL))
+ schedule_work(&net->xfrm.policy_hash_work);
+
+ return 0;
+}
+EXPORT_SYMBOL(xfrm_policy_insert);
+
+struct xfrm_policy *
+xfrm_policy_bysel_ctx(struct net *net, const struct xfrm_mark *mark, u32 if_id,
+ u8 type, int dir, struct xfrm_selector *sel,
+ struct xfrm_sec_ctx *ctx, int delete, int *err)
+{
+ struct xfrm_policy *pol, *ret;
+ struct hlist_head *chain;
+
+ *err = 0;
+ spin_lock_bh(&net->xfrm.xfrm_policy_lock);
+ chain = policy_hash_bysel(net, sel, sel->family, dir);
+ ret = NULL;
+ hlist_for_each_entry(pol, chain, bydst) {
+ if (pol->type == type &&
+ pol->if_id == if_id &&
+ xfrm_policy_mark_match(mark, pol) &&
+ !selector_cmp(sel, &pol->selector) &&
+ xfrm_sec_ctx_match(ctx, pol->security)) {
+ xfrm_pol_hold(pol);
+ if (delete) {
+ *err = security_xfrm_policy_delete(
+ pol->security);
+ if (*err) {
+ spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
+ return pol;
+ }
+ __xfrm_policy_unlink(pol, dir);
+ }
+ ret = pol;
+ break;
+ }
+ }
+ spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
+
+ if (ret && delete)
+ xfrm_policy_kill(ret);
+ return ret;
+}
+EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
+
+struct xfrm_policy *
+xfrm_policy_byid(struct net *net, const struct xfrm_mark *mark, u32 if_id,
+ u8 type, int dir, u32 id, int delete, int *err)
+{
+ struct xfrm_policy *pol, *ret;
+ struct hlist_head *chain;
+
+ *err = -ENOENT;
+ if (xfrm_policy_id2dir(id) != dir)
+ return NULL;
+
+ *err = 0;
+ spin_lock_bh(&net->xfrm.xfrm_policy_lock);
+ chain = net->xfrm.policy_byidx + idx_hash(net, id);
+ ret = NULL;
+ hlist_for_each_entry(pol, chain, byidx) {
+ if (pol->type == type && pol->index == id &&
+ pol->if_id == if_id && xfrm_policy_mark_match(mark, pol)) {
+ xfrm_pol_hold(pol);
+ if (delete) {
+ *err = security_xfrm_policy_delete(
+ pol->security);
+ if (*err) {
+ spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
+ return pol;
+ }
+ __xfrm_policy_unlink(pol, dir);
+ }
+ ret = pol;
+ break;
+ }
+ }
+ spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
+
+ if (ret && delete)
+ xfrm_policy_kill(ret);
+ return ret;
+}
+EXPORT_SYMBOL(xfrm_policy_byid);
+
+#ifdef CONFIG_SECURITY_NETWORK_XFRM
+static inline int
+xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
+{
+ int dir, err = 0;
+
+ for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
+ struct xfrm_policy *pol;
+ int i;
+
+ hlist_for_each_entry(pol,
+ &net->xfrm.policy_inexact[dir], bydst) {
+ if (pol->type != type)
+ continue;
+ err = security_xfrm_policy_delete(pol->security);
+ if (err) {
+ xfrm_audit_policy_delete(pol, 0, task_valid);
+ return err;
+ }
+ }
+ for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
+ hlist_for_each_entry(pol,
+ net->xfrm.policy_bydst[dir].table + i,
+ bydst) {
+ if (pol->type != type)
+ continue;
+ err = security_xfrm_policy_delete(
+ pol->security);
+ if (err) {
+ xfrm_audit_policy_delete(pol, 0,
+ task_valid);
+ return err;
+ }
+ }
+ }
+ }
+ return err;
+}
+#else
+static inline int
+xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
+{
+ return 0;
+}
+#endif
+
+int xfrm_policy_flush(struct net *net, u8 type, bool task_valid)
+{
+ int dir, err = 0, cnt = 0;
+
+ spin_lock_bh(&net->xfrm.xfrm_policy_lock);
+
+ err = xfrm_policy_flush_secctx_check(net, type, task_valid);
+ if (err)
+ goto out;
+
+ for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
+ struct xfrm_policy *pol;
+ int i;
+
+ again1:
+ hlist_for_each_entry(pol,
+ &net->xfrm.policy_inexact[dir], bydst) {
+ if (pol->type != type)
+ continue;
+ __xfrm_policy_unlink(pol, dir);
+ spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
+ cnt++;
+
+ xfrm_audit_policy_delete(pol, 1, task_valid);
+
+ xfrm_policy_kill(pol);
+
+ spin_lock_bh(&net->xfrm.xfrm_policy_lock);
+ goto again1;
+ }
+
+ for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
+ again2:
+ hlist_for_each_entry(pol,
+ net->xfrm.policy_bydst[dir].table + i,
+ bydst) {
+ if (pol->type != type)
+ continue;
+ __xfrm_policy_unlink(pol, dir);
+ spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
+ cnt++;
+
+ xfrm_audit_policy_delete(pol, 1, task_valid);
+ xfrm_policy_kill(pol);
+
+ spin_lock_bh(&net->xfrm.xfrm_policy_lock);
+ goto again2;
+ }
+ }
+
+ }
+ if (!cnt)
+ err = -ESRCH;
+out:
+ spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
+ return err;
+}
+EXPORT_SYMBOL(xfrm_policy_flush);
+
+int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
+ int (*func)(struct xfrm_policy *, int, int, void*),
+ void *data)
+{
+ struct xfrm_policy *pol;
+ struct xfrm_policy_walk_entry *x;
+ int error = 0;
+
+ if (walk->type >= XFRM_POLICY_TYPE_MAX &&
+ walk->type != XFRM_POLICY_TYPE_ANY)
+ return -EINVAL;
+
+ if (list_empty(&walk->walk.all) && walk->seq != 0)
+ return 0;
+
+ spin_lock_bh(&net->xfrm.xfrm_policy_lock);
+ if (list_empty(&walk->walk.all))
+ x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
+ else
+ x = list_first_entry(&walk->walk.all,
+ struct xfrm_policy_walk_entry, all);
+
+ list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
+ if (x->dead)
+ continue;
+ pol = container_of(x, struct xfrm_policy, walk);
+ if (walk->type != XFRM_POLICY_TYPE_ANY &&
+ walk->type != pol->type)
+ continue;
+ error = func(pol, xfrm_policy_id2dir(pol->index),
+ walk->seq, data);
+ if (error) {
+ list_move_tail(&walk->walk.all, &x->all);
+ goto out;
+ }
+ walk->seq++;
+ }
+ if (walk->seq == 0) {
+ error = -ENOENT;
+ goto out;
+ }
+ list_del_init(&walk->walk.all);
+out:
+ spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
+ return error;
+}
+EXPORT_SYMBOL(xfrm_policy_walk);
+
+void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
+{
+ INIT_LIST_HEAD(&walk->walk.all);
+ walk->walk.dead = 1;
+ walk->type = type;
+ walk->seq = 0;
+}
+EXPORT_SYMBOL(xfrm_policy_walk_init);
+
+void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net)
+{
+ if (list_empty(&walk->walk.all))
+ return;
+
+ spin_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */
+ list_del(&walk->walk.all);
+ spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
+}
+EXPORT_SYMBOL(xfrm_policy_walk_done);
+
+/*
+ * Find policy to apply to this flow.
+ *
+ * Returns 0 if policy found, else an -errno.
+ */
+static int xfrm_policy_match(const struct xfrm_policy *pol,
+ const struct flowi *fl,
+ u8 type, u16 family, int dir, u32 if_id)
+{
+ const struct xfrm_selector *sel = &pol->selector;
+ int ret = -ESRCH;
+ bool match;
+
+ if (pol->family != family ||
+ pol->if_id != if_id ||
+ (fl->flowi_mark & pol->mark.m) != pol->mark.v ||
+ pol->type != type)
+ return ret;
+
+ match = xfrm_selector_match(sel, fl, family);
+ if (match)
+ ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid,
+ dir);
+
+ return ret;
+}
+
+static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
+ const struct flowi *fl,
+ u16 family, u8 dir,
+ u32 if_id)
+{
+ int err;
+ struct xfrm_policy *pol, *ret;
+ const xfrm_address_t *daddr, *saddr;
+ struct hlist_head *chain;
+ unsigned int sequence;
+ u32 priority;
+
+ daddr = xfrm_flowi_daddr(fl, family);
+ saddr = xfrm_flowi_saddr(fl, family);
+ if (unlikely(!daddr || !saddr))
+ return NULL;
+
+ rcu_read_lock();
+ retry:
+ do {
+ sequence = read_seqcount_begin(&xfrm_policy_hash_generation);
+ chain = policy_hash_direct(net, daddr, saddr, family, dir);
+ } while (read_seqcount_retry(&xfrm_policy_hash_generation, sequence));
+
+ priority = ~0U;
+ ret = NULL;
+ hlist_for_each_entry_rcu(pol, chain, bydst) {
+ err = xfrm_policy_match(pol, fl, type, family, dir, if_id);
+ if (err) {
+ if (err == -ESRCH)
+ continue;
+ else {
+ ret = ERR_PTR(err);
+ goto fail;
+ }
+ } else {
+ ret = pol;
+ priority = ret->priority;
+ break;
+ }
+ }
+ chain = &net->xfrm.policy_inexact[dir];
+ hlist_for_each_entry_rcu(pol, chain, bydst) {
+ if ((pol->priority >= priority) && ret)
+ break;
+
+ err = xfrm_policy_match(pol, fl, type, family, dir, if_id);
+ if (err) {
+ if (err == -ESRCH)
+ continue;
+ else {
+ ret = ERR_PTR(err);
+ goto fail;
+ }
+ } else {
+ ret = pol;
+ break;
+ }
+ }
+
+ if (read_seqcount_retry(&xfrm_policy_hash_generation, sequence))
+ goto retry;
+
+ if (ret && !xfrm_pol_hold_rcu(ret))
+ goto retry;
+fail:
+ rcu_read_unlock();
+
+ return ret;
+}
+
+static struct xfrm_policy *xfrm_policy_lookup(struct net *net,
+ const struct flowi *fl,
+ u16 family, u8 dir, u32 if_id)
+{
+#ifdef CONFIG_XFRM_SUB_POLICY
+ struct xfrm_policy *pol;
+
+ pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family,
+ dir, if_id);
+ if (pol != NULL)
+ return pol;
+#endif
+ return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family,
+ dir, if_id);
+}
+
+static struct xfrm_policy *xfrm_sk_policy_lookup(const struct sock *sk, int dir,
+ const struct flowi *fl,
+ u16 family, u32 if_id)
+{
+ struct xfrm_policy *pol;
+
+ rcu_read_lock();
+ again:
+ pol = rcu_dereference(sk->sk_policy[dir]);
+ if (pol != NULL) {
+ bool match;
+ int err = 0;
+
+ if (pol->family != family) {
+ pol = NULL;
+ goto out;
+ }
+
+ match = xfrm_selector_match(&pol->selector, fl, family);
+ if (match) {
+ if ((sk->sk_mark & pol->mark.m) != pol->mark.v ||
+ pol->if_id != if_id) {
+ pol = NULL;
+ goto out;
+ }
+ err = security_xfrm_policy_lookup(pol->security,
+ fl->flowi_secid,
+ dir);
+ if (!err) {
+ if (!xfrm_pol_hold_rcu(pol))
+ goto again;
+ } else if (err == -ESRCH) {
+ pol = NULL;
+ } else {
+ pol = ERR_PTR(err);
+ }
+ } else
+ pol = NULL;
+ }
+out:
+ rcu_read_unlock();
+ return pol;
+}
+
+static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
+{
+ struct net *net = xp_net(pol);
+
+ list_add(&pol->walk.all, &net->xfrm.policy_all);
+ net->xfrm.policy_count[dir]++;
+ xfrm_pol_hold(pol);
+}
+
+static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
+ int dir)
+{
+ struct net *net = xp_net(pol);
+
+ if (list_empty(&pol->walk.all))
+ return NULL;
+
+ /* Socket policies are not hashed. */
+ if (!hlist_unhashed(&pol->bydst)) {
+ hlist_del_rcu(&pol->bydst);
+ hlist_del(&pol->byidx);
+ }
+
+ list_del_init(&pol->walk.all);
+ net->xfrm.policy_count[dir]--;
+
+ return pol;
+}
+
+static void xfrm_sk_policy_link(struct xfrm_policy *pol, int dir)
+{
+ __xfrm_policy_link(pol, XFRM_POLICY_MAX + dir);
+}
+
+static void xfrm_sk_policy_unlink(struct xfrm_policy *pol, int dir)
+{
+ __xfrm_policy_unlink(pol, XFRM_POLICY_MAX + dir);
+}
+
+int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
+{
+ struct net *net = xp_net(pol);
+
+ spin_lock_bh(&net->xfrm.xfrm_policy_lock);
+ pol = __xfrm_policy_unlink(pol, dir);
+ spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
+ if (pol) {
+ xfrm_policy_kill(pol);
+ return 0;
+ }
+ return -ENOENT;
+}
+EXPORT_SYMBOL(xfrm_policy_delete);
+
+int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
+{
+ struct net *net = sock_net(sk);
+ struct xfrm_policy *old_pol;
+
+#ifdef CONFIG_XFRM_SUB_POLICY
+ if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
+ return -EINVAL;
+#endif
+
+ spin_lock_bh(&net->xfrm.xfrm_policy_lock);
+ old_pol = rcu_dereference_protected(sk->sk_policy[dir],
+ lockdep_is_held(&net->xfrm.xfrm_policy_lock));
+ if (pol) {
+ pol->curlft.add_time = ktime_get_real_seconds();
+ pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0);
+ xfrm_sk_policy_link(pol, dir);
+ }
+ rcu_assign_pointer(sk->sk_policy[dir], pol);
+ if (old_pol) {
+ if (pol)
+ xfrm_policy_requeue(old_pol, pol);
+
+ /* Unlinking succeeds always. This is the only function
+ * allowed to delete or replace socket policy.
+ */
+ xfrm_sk_policy_unlink(old_pol, dir);
+ }
+ spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
+
+ if (old_pol) {
+ xfrm_policy_kill(old_pol);
+ }
+ return 0;
+}
+
+static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
+{
+ struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
+ struct net *net = xp_net(old);
+
+ if (newp) {
+ newp->selector = old->selector;
+ if (security_xfrm_policy_clone(old->security,
+ &newp->security)) {
+ kfree(newp);
+ return NULL; /* ENOMEM */
+ }
+ newp->lft = old->lft;
+ newp->curlft = old->curlft;
+ newp->mark = old->mark;
+ newp->if_id = old->if_id;
+ newp->action = old->action;
+ newp->flags = old->flags;
+ newp->xfrm_nr = old->xfrm_nr;
+ newp->index = old->index;
+ newp->type = old->type;
+ newp->family = old->family;
+ memcpy(newp->xfrm_vec, old->xfrm_vec,
+ newp->xfrm_nr*sizeof(struct xfrm_tmpl));
+ spin_lock_bh(&net->xfrm.xfrm_policy_lock);
+ xfrm_sk_policy_link(newp, dir);
+ spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
+ xfrm_pol_put(newp);
+ }
+ return newp;
+}
+
+int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
+{
+ const struct xfrm_policy *p;
+ struct xfrm_policy *np;
+ int i, ret = 0;
+
+ rcu_read_lock();
+ for (i = 0; i < 2; i++) {
+ p = rcu_dereference(osk->sk_policy[i]);
+ if (p) {
+ np = clone_policy(p, i);
+ if (unlikely(!np)) {
+ ret = -ENOMEM;
+ break;
+ }
+ rcu_assign_pointer(sk->sk_policy[i], np);
+ }
+ }
+ rcu_read_unlock();
+ return ret;
+}
+
+static int
+xfrm_get_saddr(struct net *net, int oif, xfrm_address_t *local,
+ xfrm_address_t *remote, unsigned short family, u32 mark)
+{
+ int err;
+ const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
+
+ if (unlikely(afinfo == NULL))
+ return -EINVAL;
+ err = afinfo->get_saddr(net, oif, local, remote, mark);
+ rcu_read_unlock();
+ return err;
+}
+
+/* Resolve list of templates for the flow, given policy. */
+
+static int
+xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
+ struct xfrm_state **xfrm, unsigned short family)
+{
+ struct net *net = xp_net(policy);
+ int nx;
+ int i, error;
+ xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
+ xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
+ xfrm_address_t tmp;
+
+ for (nx = 0, i = 0; i < policy->xfrm_nr; i++) {
+ struct xfrm_state *x;
+ xfrm_address_t *remote = daddr;
+ xfrm_address_t *local = saddr;
+ struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
+
+ if (tmpl->mode == XFRM_MODE_TUNNEL ||
+ tmpl->mode == XFRM_MODE_BEET) {
+ remote = &tmpl->id.daddr;
+ local = &tmpl->saddr;
+ if (xfrm_addr_any(local, tmpl->encap_family)) {
+ error = xfrm_get_saddr(net, fl->flowi_oif,
+ &tmp, remote,
+ tmpl->encap_family, 0);
+ if (error)
+ goto fail;
+ local = &tmp;
+ }
+ }
+
+ x = xfrm_state_find(remote, local, fl, tmpl, policy, &error,
+ family, policy->if_id);
+
+ if (x && x->km.state == XFRM_STATE_VALID) {
+ xfrm[nx++] = x;
+ daddr = remote;
+ saddr = local;
+ continue;
+ }
+ if (x) {
+ error = (x->km.state == XFRM_STATE_ERROR ?
+ -EINVAL : -EAGAIN);
+ xfrm_state_put(x);
+ } else if (error == -ESRCH) {
+ error = -EAGAIN;
+ }
+
+ if (!tmpl->optional)
+ goto fail;
+ }
+ return nx;
+
+fail:
+ for (nx--; nx >= 0; nx--)
+ xfrm_state_put(xfrm[nx]);
+ return error;
+}
+
+static int
+xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl,
+ struct xfrm_state **xfrm, unsigned short family)
+{
+ struct xfrm_state *tp[XFRM_MAX_DEPTH];
+ struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
+ int cnx = 0;
+ int error;
+ int ret;
+ int i;
+
+ for (i = 0; i < npols; i++) {
+ if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
+ error = -ENOBUFS;
+ goto fail;
+ }
+
+ ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
+ if (ret < 0) {
+ error = ret;
+ goto fail;
+ } else
+ cnx += ret;
+ }
+
+ /* found states are sorted for outbound processing */
+ if (npols > 1)
+ xfrm_state_sort(xfrm, tpp, cnx, family);
+
+ return cnx;
+
+ fail:
+ for (cnx--; cnx >= 0; cnx--)
+ xfrm_state_put(tpp[cnx]);
+ return error;
+
+}
+
+static int xfrm_get_tos(const struct flowi *fl, int family)
+{
+ const struct xfrm_policy_afinfo *afinfo;
+ int tos;
+
+ afinfo = xfrm_policy_get_afinfo(family);
+ if (!afinfo)
+ return 0;
+
+ tos = afinfo->get_tos(fl);
+
+ rcu_read_unlock();
+
+ return tos;
+}
+
+static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
+{
+ const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
+ struct dst_ops *dst_ops;
+ struct xfrm_dst *xdst;
+
+ if (!afinfo)
+ return ERR_PTR(-EINVAL);
+
+ switch (family) {
+ case AF_INET:
+ dst_ops = &net->xfrm.xfrm4_dst_ops;
+ break;
+#if IS_ENABLED(CONFIG_IPV6)
+ case AF_INET6:
+ dst_ops = &net->xfrm.xfrm6_dst_ops;
+ break;
+#endif
+ default:
+ BUG();
+ }
+ xdst = dst_alloc(dst_ops, NULL, 1, DST_OBSOLETE_NONE, 0);
+
+ if (likely(xdst)) {
+ struct dst_entry *dst = &xdst->u.dst;
+
+ memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst));
+ } else
+ xdst = ERR_PTR(-ENOBUFS);
+
+ rcu_read_unlock();
+
+ return xdst;
+}
+
+static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
+ int nfheader_len)
+{
+ const struct xfrm_policy_afinfo *afinfo =
+ xfrm_policy_get_afinfo(dst->ops->family);
+ int err;
+
+ if (!afinfo)
+ return -EINVAL;
+
+ err = afinfo->init_path(path, dst, nfheader_len);
+
+ rcu_read_unlock();
+
+ return err;
+}
+
+static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
+ const struct flowi *fl)
+{
+ const struct xfrm_policy_afinfo *afinfo =
+ xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
+ int err;
+
+ if (!afinfo)
+ return -EINVAL;
+
+ err = afinfo->fill_dst(xdst, dev, fl);
+
+ rcu_read_unlock();
+
+ return err;
+}
+
+
+/* Allocate chain of dst_entry's, attach known xfrm's, calculate
+ * all the metrics... Shortly, bundle a bundle.
+ */
+
+static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
+ struct xfrm_state **xfrm,
+ struct xfrm_dst **bundle,
+ int nx,
+ const struct flowi *fl,
+ struct dst_entry *dst)
+{
+ struct net *net = xp_net(policy);
+ unsigned long now = jiffies;
+ struct net_device *dev;
+ struct xfrm_mode *inner_mode;
+ struct xfrm_dst *xdst_prev = NULL;
+ struct xfrm_dst *xdst0 = NULL;
+ int i = 0;
+ int err;
+ int header_len = 0;
+ int nfheader_len = 0;
+ int trailer_len = 0;
+ int tos;
+ int family = policy->selector.family;
+ xfrm_address_t saddr, daddr;
+
+ xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
+
+ tos = xfrm_get_tos(fl, family);
+
+ dst_hold(dst);
+
+ for (; i < nx; i++) {
+ struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
+ struct dst_entry *dst1 = &xdst->u.dst;
+
+ err = PTR_ERR(xdst);
+ if (IS_ERR(xdst)) {
+ dst_release(dst);
+ goto put_states;
+ }
+
+ bundle[i] = xdst;
+ if (!xdst_prev)
+ xdst0 = xdst;
+ else
+ /* Ref count is taken during xfrm_alloc_dst()
+ * No need to do dst_clone() on dst1
+ */
+ xfrm_dst_set_child(xdst_prev, &xdst->u.dst);
+
+ if (xfrm[i]->sel.family == AF_UNSPEC) {
+ inner_mode = xfrm_ip2inner_mode(xfrm[i],
+ xfrm_af2proto(family));
+ if (!inner_mode) {
+ err = -EAFNOSUPPORT;
+ dst_release(dst);
+ goto put_states;
+ }
+ } else
+ inner_mode = xfrm[i]->inner_mode;
+
+ xdst->route = dst;
+ dst_copy_metrics(dst1, dst);
+
+ if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
+ __u32 mark = 0;
+
+ if (xfrm[i]->props.smark.v || xfrm[i]->props.smark.m)
+ mark = xfrm_smark_get(fl->flowi_mark, xfrm[i]);
+
+ family = xfrm[i]->props.family;
+ dst = xfrm_dst_lookup(xfrm[i], tos, fl->flowi_oif,
+ &saddr, &daddr, family, mark);
+ err = PTR_ERR(dst);
+ if (IS_ERR(dst))
+ goto put_states;
+ } else
+ dst_hold(dst);
+
+ dst1->xfrm = xfrm[i];
+ xdst->xfrm_genid = xfrm[i]->genid;
+
+ dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
+ dst1->flags |= DST_HOST;
+ dst1->lastuse = now;
+
+ dst1->input = dst_discard;
+ dst1->output = inner_mode->afinfo->output;
+
+ xdst_prev = xdst;
+
+ header_len += xfrm[i]->props.header_len;
+ if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
+ nfheader_len += xfrm[i]->props.header_len;
+ trailer_len += xfrm[i]->props.trailer_len;
+ }
+
+ xfrm_dst_set_child(xdst_prev, dst);
+ xdst0->path = dst;
+
+ err = -ENODEV;
+ dev = dst->dev;
+ if (!dev)
+ goto free_dst;
+
+ xfrm_init_path(xdst0, dst, nfheader_len);
+ xfrm_init_pmtu(bundle, nx);
+
+ for (xdst_prev = xdst0; xdst_prev != (struct xfrm_dst *)dst;
+ xdst_prev = (struct xfrm_dst *) xfrm_dst_child(&xdst_prev->u.dst)) {
+ err = xfrm_fill_dst(xdst_prev, dev, fl);
+ if (err)
+ goto free_dst;
+
+ xdst_prev->u.dst.header_len = header_len;
+ xdst_prev->u.dst.trailer_len = trailer_len;
+ header_len -= xdst_prev->u.dst.xfrm->props.header_len;
+ trailer_len -= xdst_prev->u.dst.xfrm->props.trailer_len;
+ }
+
+ return &xdst0->u.dst;
+
+put_states:
+ for (; i < nx; i++)
+ xfrm_state_put(xfrm[i]);
+free_dst:
+ if (xdst0)
+ dst_release_immediate(&xdst0->u.dst);
+
+ return ERR_PTR(err);
+}
+
+static int xfrm_expand_policies(const struct flowi *fl, u16 family,
+ struct xfrm_policy **pols,
+ int *num_pols, int *num_xfrms)
+{
+ int i;
+
+ if (*num_pols == 0 || !pols[0]) {
+ *num_pols = 0;
+ *num_xfrms = 0;
+ return 0;
+ }
+ if (IS_ERR(pols[0]))
+ return PTR_ERR(pols[0]);
+
+ *num_xfrms = pols[0]->xfrm_nr;
+
+#ifdef CONFIG_XFRM_SUB_POLICY
+ if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
+ pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
+ pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
+ XFRM_POLICY_TYPE_MAIN,
+ fl, family,
+ XFRM_POLICY_OUT,
+ pols[0]->if_id);
+ if (pols[1]) {
+ if (IS_ERR(pols[1])) {
+ xfrm_pols_put(pols, *num_pols);
+ return PTR_ERR(pols[1]);
+ }
+ (*num_pols)++;
+ (*num_xfrms) += pols[1]->xfrm_nr;
+ }
+ }
+#endif
+ for (i = 0; i < *num_pols; i++) {
+ if (pols[i]->action != XFRM_POLICY_ALLOW) {
+ *num_xfrms = -1;
+ break;
+ }
+ }
+
+ return 0;
+
+}
+
+static struct xfrm_dst *
+xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
+ const struct flowi *fl, u16 family,
+ struct dst_entry *dst_orig)
+{
+ struct net *net = xp_net(pols[0]);
+ struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
+ struct xfrm_dst *bundle[XFRM_MAX_DEPTH];
+ struct xfrm_dst *xdst;
+ struct dst_entry *dst;
+ int err;
+
+ /* Try to instantiate a bundle */
+ err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
+ if (err <= 0) {
+ if (err == 0)
+ return NULL;
+
+ if (err != -EAGAIN)
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
+ return ERR_PTR(err);
+ }
+
+ dst = xfrm_bundle_create(pols[0], xfrm, bundle, err, fl, dst_orig);
+ if (IS_ERR(dst)) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
+ return ERR_CAST(dst);
+ }
+
+ xdst = (struct xfrm_dst *)dst;
+ xdst->num_xfrms = err;
+ xdst->num_pols = num_pols;
+ memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
+ xdst->policy_genid = atomic_read(&pols[0]->genid);
+
+ return xdst;
+}
+
+static void xfrm_policy_queue_process(struct timer_list *t)
+{
+ struct sk_buff *skb;
+ struct sock *sk;
+ struct dst_entry *dst;
+ struct xfrm_policy *pol = from_timer(pol, t, polq.hold_timer);
+ struct net *net = xp_net(pol);
+ struct xfrm_policy_queue *pq = &pol->polq;
+ struct flowi fl;
+ struct sk_buff_head list;
+
+ spin_lock(&pq->hold_queue.lock);
+ skb = skb_peek(&pq->hold_queue);
+ if (!skb) {
+ spin_unlock(&pq->hold_queue.lock);
+ goto out;
+ }
+ dst = skb_dst(skb);
+ sk = skb->sk;
+ xfrm_decode_session(skb, &fl, dst->ops->family);
+ spin_unlock(&pq->hold_queue.lock);
+
+ dst_hold(xfrm_dst_path(dst));
+ dst = xfrm_lookup(net, xfrm_dst_path(dst), &fl, sk, XFRM_LOOKUP_QUEUE);
+ if (IS_ERR(dst))
+ goto purge_queue;
+
+ if (dst->flags & DST_XFRM_QUEUE) {
+ dst_release(dst);
+
+ if (pq->timeout >= XFRM_QUEUE_TMO_MAX)
+ goto purge_queue;
+
+ pq->timeout = pq->timeout << 1;
+ if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout))
+ xfrm_pol_hold(pol);
+ goto out;
+ }
+
+ dst_release(dst);
+
+ __skb_queue_head_init(&list);
+
+ spin_lock(&pq->hold_queue.lock);
+ pq->timeout = 0;
+ skb_queue_splice_init(&pq->hold_queue, &list);
+ spin_unlock(&pq->hold_queue.lock);
+
+ while (!skb_queue_empty(&list)) {
+ skb = __skb_dequeue(&list);
+
+ xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family);
+ dst_hold(xfrm_dst_path(skb_dst(skb)));
+ dst = xfrm_lookup(net, xfrm_dst_path(skb_dst(skb)), &fl, skb->sk, 0);
+ if (IS_ERR(dst)) {
+ kfree_skb(skb);
+ continue;
+ }
+
+ nf_reset(skb);
+ skb_dst_drop(skb);
+ skb_dst_set(skb, dst);
+
+ dst_output(net, skb->sk, skb);
+ }
+
+out:
+ xfrm_pol_put(pol);
+ return;
+
+purge_queue:
+ pq->timeout = 0;
+ skb_queue_purge(&pq->hold_queue);
+ xfrm_pol_put(pol);
+}
+
+static int xdst_queue_output(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ unsigned long sched_next;
+ struct dst_entry *dst = skb_dst(skb);
+ struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
+ struct xfrm_policy *pol = xdst->pols[0];
+ struct xfrm_policy_queue *pq = &pol->polq;
+
+ if (unlikely(skb_fclone_busy(sk, skb))) {
+ kfree_skb(skb);
+ return 0;
+ }
+
+ if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) {
+ kfree_skb(skb);
+ return -EAGAIN;
+ }
+
+ skb_dst_force(skb);
+
+ spin_lock_bh(&pq->hold_queue.lock);
+
+ if (!pq->timeout)
+ pq->timeout = XFRM_QUEUE_TMO_MIN;
+
+ sched_next = jiffies + pq->timeout;
+
+ if (del_timer(&pq->hold_timer)) {
+ if (time_before(pq->hold_timer.expires, sched_next))
+ sched_next = pq->hold_timer.expires;
+ xfrm_pol_put(pol);
+ }
+
+ __skb_queue_tail(&pq->hold_queue, skb);
+ if (!mod_timer(&pq->hold_timer, sched_next))
+ xfrm_pol_hold(pol);
+
+ spin_unlock_bh(&pq->hold_queue.lock);
+
+ return 0;
+}
+
+static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net,
+ struct xfrm_flo *xflo,
+ const struct flowi *fl,
+ int num_xfrms,
+ u16 family)
+{
+ int err;
+ struct net_device *dev;
+ struct dst_entry *dst;
+ struct dst_entry *dst1;
+ struct xfrm_dst *xdst;
+
+ xdst = xfrm_alloc_dst(net, family);
+ if (IS_ERR(xdst))
+ return xdst;
+
+ if (!(xflo->flags & XFRM_LOOKUP_QUEUE) ||
+ net->xfrm.sysctl_larval_drop ||
+ num_xfrms <= 0)
+ return xdst;
+
+ dst = xflo->dst_orig;
+ dst1 = &xdst->u.dst;
+ dst_hold(dst);
+ xdst->route = dst;
+
+ dst_copy_metrics(dst1, dst);
+
+ dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
+ dst1->flags |= DST_HOST | DST_XFRM_QUEUE;
+ dst1->lastuse = jiffies;
+
+ dst1->input = dst_discard;
+ dst1->output = xdst_queue_output;
+
+ dst_hold(dst);
+ xfrm_dst_set_child(xdst, dst);
+ xdst->path = dst;
+
+ xfrm_init_path((struct xfrm_dst *)dst1, dst, 0);
+
+ err = -ENODEV;
+ dev = dst->dev;
+ if (!dev)
+ goto free_dst;
+
+ err = xfrm_fill_dst(xdst, dev, fl);
+ if (err)
+ goto free_dst;
+
+out:
+ return xdst;
+
+free_dst:
+ dst_release(dst1);
+ xdst = ERR_PTR(err);
+ goto out;
+}
+
+static struct xfrm_dst *xfrm_bundle_lookup(struct net *net,
+ const struct flowi *fl,
+ u16 family, u8 dir,
+ struct xfrm_flo *xflo, u32 if_id)
+{
+ struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
+ int num_pols = 0, num_xfrms = 0, err;
+ struct xfrm_dst *xdst;
+
+ /* Resolve policies to use if we couldn't get them from
+ * previous cache entry */
+ num_pols = 1;
+ pols[0] = xfrm_policy_lookup(net, fl, family, dir, if_id);
+ err = xfrm_expand_policies(fl, family, pols,
+ &num_pols, &num_xfrms);
+ if (err < 0)
+ goto inc_error;
+ if (num_pols == 0)
+ return NULL;
+ if (num_xfrms <= 0)
+ goto make_dummy_bundle;
+
+ xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family,
+ xflo->dst_orig);
+ if (IS_ERR(xdst)) {
+ err = PTR_ERR(xdst);
+ if (err == -EREMOTE) {
+ xfrm_pols_put(pols, num_pols);
+ return NULL;
+ }
+
+ if (err != -EAGAIN)
+ goto error;
+ goto make_dummy_bundle;
+ } else if (xdst == NULL) {
+ num_xfrms = 0;
+ goto make_dummy_bundle;
+ }
+
+ return xdst;
+
+make_dummy_bundle:
+ /* We found policies, but there's no bundles to instantiate:
+ * either because the policy blocks, has no transformations or
+ * we could not build template (no xfrm_states).*/
+ xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family);
+ if (IS_ERR(xdst)) {
+ xfrm_pols_put(pols, num_pols);
+ return ERR_CAST(xdst);
+ }
+ xdst->num_pols = num_pols;
+ xdst->num_xfrms = num_xfrms;
+ memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
+
+ return xdst;
+
+inc_error:
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
+error:
+ xfrm_pols_put(pols, num_pols);
+ return ERR_PTR(err);
+}
+
+static struct dst_entry *make_blackhole(struct net *net, u16 family,
+ struct dst_entry *dst_orig)
+{
+ const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
+ struct dst_entry *ret;
+
+ if (!afinfo) {
+ dst_release(dst_orig);
+ return ERR_PTR(-EINVAL);
+ } else {
+ ret = afinfo->blackhole_route(net, dst_orig);
+ }
+ rcu_read_unlock();
+
+ return ret;
+}
+
+/* Finds/creates a bundle for given flow and if_id
+ *
+ * At the moment we eat a raw IP route. Mostly to speed up lookups
+ * on interfaces with disabled IPsec.
+ *
+ * xfrm_lookup uses an if_id of 0 by default, and is provided for
+ * compatibility
+ */
+struct dst_entry *xfrm_lookup_with_ifid(struct net *net,
+ struct dst_entry *dst_orig,
+ const struct flowi *fl,
+ const struct sock *sk,
+ int flags, u32 if_id)
+{
+ struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
+ struct xfrm_dst *xdst;
+ struct dst_entry *dst, *route;
+ u16 family = dst_orig->ops->family;
+ u8 dir = XFRM_POLICY_OUT;
+ int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
+
+ dst = NULL;
+ xdst = NULL;
+ route = NULL;
+
+ sk = sk_const_to_full_sk(sk);
+ if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
+ num_pols = 1;
+ pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl, family,
+ if_id);
+ err = xfrm_expand_policies(fl, family, pols,
+ &num_pols, &num_xfrms);
+ if (err < 0)
+ goto dropdst;
+
+ if (num_pols) {
+ if (num_xfrms <= 0) {
+ drop_pols = num_pols;
+ goto no_transform;
+ }
+
+ xdst = xfrm_resolve_and_create_bundle(
+ pols, num_pols, fl,
+ family, dst_orig);
+
+ if (IS_ERR(xdst)) {
+ xfrm_pols_put(pols, num_pols);
+ err = PTR_ERR(xdst);
+ if (err == -EREMOTE)
+ goto nopol;
+
+ goto dropdst;
+ } else if (xdst == NULL) {
+ num_xfrms = 0;
+ drop_pols = num_pols;
+ goto no_transform;
+ }
+
+ route = xdst->route;
+ }
+ }
+
+ if (xdst == NULL) {
+ struct xfrm_flo xflo;
+
+ xflo.dst_orig = dst_orig;
+ xflo.flags = flags;
+
+ /* To accelerate a bit... */
+ if (!if_id && ((dst_orig->flags & DST_NOXFRM) ||
+ !net->xfrm.policy_count[XFRM_POLICY_OUT]))
+ goto nopol;
+
+ xdst = xfrm_bundle_lookup(net, fl, family, dir, &xflo, if_id);
+ if (xdst == NULL)
+ goto nopol;
+ if (IS_ERR(xdst)) {
+ err = PTR_ERR(xdst);
+ goto dropdst;
+ }
+
+ num_pols = xdst->num_pols;
+ num_xfrms = xdst->num_xfrms;
+ memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols);
+ route = xdst->route;
+ }
+
+ dst = &xdst->u.dst;
+ if (route == NULL && num_xfrms > 0) {
+ /* The only case when xfrm_bundle_lookup() returns a
+ * bundle with null route, is when the template could
+ * not be resolved. It means policies are there, but
+ * bundle could not be created, since we don't yet
+ * have the xfrm_state's. We need to wait for KM to
+ * negotiate new SA's or bail out with error.*/
+ if (net->xfrm.sysctl_larval_drop) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
+ err = -EREMOTE;
+ goto error;
+ }
+
+ err = -EAGAIN;
+
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
+ goto error;
+ }
+
+no_transform:
+ if (num_pols == 0)
+ goto nopol;
+
+ if ((flags & XFRM_LOOKUP_ICMP) &&
+ !(pols[0]->flags & XFRM_POLICY_ICMP)) {
+ err = -ENOENT;
+ goto error;
+ }
+
+ for (i = 0; i < num_pols; i++)
+ pols[i]->curlft.use_time = ktime_get_real_seconds();
+
+ if (num_xfrms < 0) {
+ /* Prohibit the flow */
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
+ err = -EPERM;
+ goto error;
+ } else if (num_xfrms > 0) {
+ /* Flow transformed */
+ dst_release(dst_orig);
+ } else {
+ /* Flow passes untransformed */
+ dst_release(dst);
+ dst = dst_orig;
+ }
+ok:
+ xfrm_pols_put(pols, drop_pols);
+ if (dst && dst->xfrm &&
+ dst->xfrm->props.mode == XFRM_MODE_TUNNEL)
+ dst->flags |= DST_XFRM_TUNNEL;
+ return dst;
+
+nopol:
+ if (!(flags & XFRM_LOOKUP_ICMP)) {
+ dst = dst_orig;
+ goto ok;
+ }
+ err = -ENOENT;
+error:
+ dst_release(dst);
+dropdst:
+ if (!(flags & XFRM_LOOKUP_KEEP_DST_REF))
+ dst_release(dst_orig);
+ xfrm_pols_put(pols, drop_pols);
+ return ERR_PTR(err);
+}
+EXPORT_SYMBOL(xfrm_lookup_with_ifid);
+
+/* Main function: finds/creates a bundle for given flow.
+ *
+ * At the moment we eat a raw IP route. Mostly to speed up lookups
+ * on interfaces with disabled IPsec.
+ */
+struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
+ const struct flowi *fl, const struct sock *sk,
+ int flags)
+{
+ return xfrm_lookup_with_ifid(net, dst_orig, fl, sk, flags, 0);
+}
+EXPORT_SYMBOL(xfrm_lookup);
+
+/* Callers of xfrm_lookup_route() must ensure a call to dst_output().
+ * Otherwise we may send out blackholed packets.
+ */
+struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
+ const struct flowi *fl,
+ const struct sock *sk, int flags)
+{
+ struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk,
+ flags | XFRM_LOOKUP_QUEUE |
+ XFRM_LOOKUP_KEEP_DST_REF);
+
+ if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE)
+ return make_blackhole(net, dst_orig->ops->family, dst_orig);
+
+ if (IS_ERR(dst))
+ dst_release(dst_orig);
+
+ return dst;
+}
+EXPORT_SYMBOL(xfrm_lookup_route);
+
+static inline int
+xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
+{
+ struct xfrm_state *x;
+
+ if (!skb->sp || idx < 0 || idx >= skb->sp->len)
+ return 0;
+ x = skb->sp->xvec[idx];
+ if (!x->type->reject)
+ return 0;
+ return x->type->reject(x, skb, fl);
+}
+
+/* When skb is transformed back to its "native" form, we have to
+ * check policy restrictions. At the moment we make this in maximally
+ * stupid way. Shame on me. :-) Of course, connected sockets must
+ * have policy cached at them.
+ */
+
+static inline int
+xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
+ unsigned short family)
+{
+ if (xfrm_state_kern(x))
+ return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
+ return x->id.proto == tmpl->id.proto &&
+ (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
+ (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
+ x->props.mode == tmpl->mode &&
+ (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
+ !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
+ !(x->props.mode != XFRM_MODE_TRANSPORT &&
+ xfrm_state_addr_cmp(tmpl, x, family));
+}
+
+/*
+ * 0 or more than 0 is returned when validation is succeeded (either bypass
+ * because of optional transport mode, or next index of the mathced secpath
+ * state with the template.
+ * -1 is returned when no matching template is found.
+ * Otherwise "-2 - errored_index" is returned.
+ */
+static inline int
+xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
+ unsigned short family)
+{
+ int idx = start;
+
+ if (tmpl->optional) {
+ if (tmpl->mode == XFRM_MODE_TRANSPORT)
+ return start;
+ } else
+ start = -1;
+ for (; idx < sp->len; idx++) {
+ if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
+ return ++idx;
+ if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
+ if (start == -1)
+ start = -2-idx;
+ break;
+ }
+ }
+ return start;
+}
+
+int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
+ unsigned int family, int reverse)
+{
+ const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
+ int err;
+
+ if (unlikely(afinfo == NULL))
+ return -EAFNOSUPPORT;
+
+ afinfo->decode_session(skb, fl, reverse);
+
+ err = security_xfrm_decode_session(skb, &fl->flowi_secid);
+ rcu_read_unlock();
+ return err;
+}
+EXPORT_SYMBOL(__xfrm_decode_session);
+
+static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
+{
+ for (; k < sp->len; k++) {
+ if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
+ *idxp = k;
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
+ unsigned short family)
+{
+ struct net *net = dev_net(skb->dev);
+ struct xfrm_policy *pol;
+ struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
+ int npols = 0;
+ int xfrm_nr;
+ int pi;
+ int reverse;
+ struct flowi fl;
+ int xerr_idx = -1;
+ const struct xfrm_if_cb *ifcb;
+ struct xfrm_if *xi;
+ u32 if_id = 0;
+
+ rcu_read_lock();
+ ifcb = xfrm_if_get_cb();
+
+ if (ifcb) {
+ xi = ifcb->decode_session(skb, family);
+ if (xi) {
+ if_id = xi->p.if_id;
+ net = xi->net;
+ }
+ }
+ rcu_read_unlock();
+
+ reverse = dir & ~XFRM_POLICY_MASK;
+ dir &= XFRM_POLICY_MASK;
+
+ if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
+ return 0;
+ }
+
+ nf_nat_decode_session(skb, &fl, family);
+
+ /* First, check used SA against their selectors. */
+ if (skb->sp) {
+ int i;
+
+ for (i = skb->sp->len-1; i >= 0; i--) {
+ struct xfrm_state *x = skb->sp->xvec[i];
+ if (!xfrm_selector_match(&x->sel, &fl, family)) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
+ return 0;
+ }
+ }
+ }
+
+ pol = NULL;
+ sk = sk_to_full_sk(sk);
+ if (sk && sk->sk_policy[dir]) {
+ pol = xfrm_sk_policy_lookup(sk, dir, &fl, family, if_id);
+ if (IS_ERR(pol)) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
+ return 0;
+ }
+ }
+
+ if (!pol)
+ pol = xfrm_policy_lookup(net, &fl, family, dir, if_id);
+
+ if (IS_ERR(pol)) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
+ return 0;
+ }
+
+ if (!pol) {
+ if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
+ xfrm_secpath_reject(xerr_idx, skb, &fl);
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
+ return 0;
+ }
+ return 1;
+ }
+
+ pol->curlft.use_time = ktime_get_real_seconds();
+
+ pols[0] = pol;
+ npols++;
+#ifdef CONFIG_XFRM_SUB_POLICY
+ if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
+ pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
+ &fl, family,
+ XFRM_POLICY_IN, if_id);
+ if (pols[1]) {
+ if (IS_ERR(pols[1])) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
+ return 0;
+ }
+ pols[1]->curlft.use_time = ktime_get_real_seconds();
+ npols++;
+ }
+ }
+#endif
+
+ if (pol->action == XFRM_POLICY_ALLOW) {
+ struct sec_path *sp;
+ static struct sec_path dummy;
+ struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
+ struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
+ struct xfrm_tmpl **tpp = tp;
+ int ti = 0;
+ int i, k;
+
+ if ((sp = skb->sp) == NULL)
+ sp = &dummy;
+
+ for (pi = 0; pi < npols; pi++) {
+ if (pols[pi] != pol &&
+ pols[pi]->action != XFRM_POLICY_ALLOW) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
+ goto reject;
+ }
+ if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
+ goto reject_error;
+ }
+ for (i = 0; i < pols[pi]->xfrm_nr; i++)
+ tpp[ti++] = &pols[pi]->xfrm_vec[i];
+ }
+ xfrm_nr = ti;
+ if (npols > 1) {
+ xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net);
+ tpp = stp;
+ }
+
+ /* For each tunnel xfrm, find the first matching tmpl.
+ * For each tmpl before that, find corresponding xfrm.
+ * Order is _important_. Later we will implement
+ * some barriers, but at the moment barriers
+ * are implied between each two transformations.
+ */
+ for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
+ k = xfrm_policy_ok(tpp[i], sp, k, family);
+ if (k < 0) {
+ if (k < -1)
+ /* "-2 - errored_index" returned */
+ xerr_idx = -(2+k);
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
+ goto reject;
+ }
+ }
+
+ if (secpath_has_nontransport(sp, k, &xerr_idx)) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
+ goto reject;
+ }
+
+ xfrm_pols_put(pols, npols);
+ return 1;
+ }
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
+
+reject:
+ xfrm_secpath_reject(xerr_idx, skb, &fl);
+reject_error:
+ xfrm_pols_put(pols, npols);
+ return 0;
+}
+EXPORT_SYMBOL(__xfrm_policy_check);
+
+int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
+{
+ struct net *net = dev_net(skb->dev);
+ struct flowi fl;
+ struct dst_entry *dst;
+ int res = 1;
+
+ if (xfrm_decode_session(skb, &fl, family) < 0) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
+ return 0;
+ }
+
+ skb_dst_force(skb);
+ if (!skb_dst(skb)) {
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
+ return 0;
+ }
+
+ dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE);
+ if (IS_ERR(dst)) {
+ res = 0;
+ dst = NULL;
+ }
+ skb_dst_set(skb, dst);
+ return res;
+}
+EXPORT_SYMBOL(__xfrm_route_forward);
+
+/* Optimize later using cookies and generation ids. */
+
+static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
+{
+ /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
+ * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
+ * get validated by dst_ops->check on every use. We do this
+ * because when a normal route referenced by an XFRM dst is
+ * obsoleted we do not go looking around for all parent
+ * referencing XFRM dsts so that we can invalidate them. It
+ * is just too much work. Instead we make the checks here on
+ * every use. For example:
+ *
+ * XFRM dst A --> IPv4 dst X
+ *
+ * X is the "xdst->route" of A (X is also the "dst->path" of A
+ * in this example). If X is marked obsolete, "A" will not
+ * notice. That's what we are validating here via the
+ * stale_bundle() check.
+ *
+ * When a dst is removed from the fib tree, DST_OBSOLETE_DEAD will
+ * be marked on it.
+ * This will force stale_bundle() to fail on any xdst bundle with
+ * this dst linked in it.
+ */
+ if (dst->obsolete < 0 && !stale_bundle(dst))
+ return dst;
+
+ return NULL;
+}
+
+static int stale_bundle(struct dst_entry *dst)
+{
+ return !xfrm_bundle_ok((struct xfrm_dst *)dst);
+}
+
+void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
+{
+ while ((dst = xfrm_dst_child(dst)) && dst->xfrm && dst->dev == dev) {
+ dst->dev = dev_net(dev)->loopback_dev;
+ dev_hold(dst->dev);
+ dev_put(dev);
+ }
+}
+EXPORT_SYMBOL(xfrm_dst_ifdown);
+
+static void xfrm_link_failure(struct sk_buff *skb)
+{
+ /* Impossible. Such dst must be popped before reaches point of failure. */
+}
+
+static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
+{
+ if (dst) {
+ if (dst->obsolete) {
+ dst_release(dst);
+ dst = NULL;
+ }
+ }
+ return dst;
+}
+
+static void xfrm_init_pmtu(struct xfrm_dst **bundle, int nr)
+{
+ while (nr--) {
+ struct xfrm_dst *xdst = bundle[nr];
+ u32 pmtu, route_mtu_cached;
+ struct dst_entry *dst;
+
+ dst = &xdst->u.dst;
+ pmtu = dst_mtu(xfrm_dst_child(dst));
+ xdst->child_mtu_cached = pmtu;
+
+ pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
+
+ route_mtu_cached = dst_mtu(xdst->route);
+ xdst->route_mtu_cached = route_mtu_cached;
+
+ if (pmtu > route_mtu_cached)
+ pmtu = route_mtu_cached;
+
+ dst_metric_set(dst, RTAX_MTU, pmtu);
+ }
+}
+
+/* Check that the bundle accepts the flow and its components are
+ * still valid.
+ */
+
+static int xfrm_bundle_ok(struct xfrm_dst *first)
+{
+ struct xfrm_dst *bundle[XFRM_MAX_DEPTH];
+ struct dst_entry *dst = &first->u.dst;
+ struct xfrm_dst *xdst;
+ int start_from, nr;
+ u32 mtu;
+
+ if (!dst_check(xfrm_dst_path(dst), ((struct xfrm_dst *)dst)->path_cookie) ||
+ (dst->dev && !netif_running(dst->dev)))
+ return 0;
+
+ if (dst->flags & DST_XFRM_QUEUE)
+ return 1;
+
+ start_from = nr = 0;
+ do {
+ struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
+
+ if (dst->xfrm->km.state != XFRM_STATE_VALID)
+ return 0;
+ if (xdst->xfrm_genid != dst->xfrm->genid)
+ return 0;
+ if (xdst->num_pols > 0 &&
+ xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
+ return 0;
+
+ bundle[nr++] = xdst;
+
+ mtu = dst_mtu(xfrm_dst_child(dst));
+ if (xdst->child_mtu_cached != mtu) {
+ start_from = nr;
+ xdst->child_mtu_cached = mtu;
+ }
+
+ if (!dst_check(xdst->route, xdst->route_cookie))
+ return 0;
+ mtu = dst_mtu(xdst->route);
+ if (xdst->route_mtu_cached != mtu) {
+ start_from = nr;
+ xdst->route_mtu_cached = mtu;
+ }
+
+ dst = xfrm_dst_child(dst);
+ } while (dst->xfrm);
+
+ if (likely(!start_from))
+ return 1;
+
+ xdst = bundle[start_from - 1];
+ mtu = xdst->child_mtu_cached;
+ while (start_from--) {
+ dst = &xdst->u.dst;
+
+ mtu = xfrm_state_mtu(dst->xfrm, mtu);
+ if (mtu > xdst->route_mtu_cached)
+ mtu = xdst->route_mtu_cached;
+ dst_metric_set(dst, RTAX_MTU, mtu);
+ if (!start_from)
+ break;
+
+ xdst = bundle[start_from - 1];
+ xdst->child_mtu_cached = mtu;
+ }
+
+ return 1;
+}
+
+static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
+{
+ return dst_metric_advmss(xfrm_dst_path(dst));
+}
+
+static unsigned int xfrm_mtu(const struct dst_entry *dst)
+{
+ unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
+
+ return mtu ? : dst_mtu(xfrm_dst_path(dst));
+}
+
+static const void *xfrm_get_dst_nexthop(const struct dst_entry *dst,
+ const void *daddr)
+{
+ while (dst->xfrm) {
+ const struct xfrm_state *xfrm = dst->xfrm;
+
+ dst = xfrm_dst_child(dst);
+
+ if (xfrm->props.mode == XFRM_MODE_TRANSPORT)
+ continue;
+ if (xfrm->type->flags & XFRM_TYPE_REMOTE_COADDR)
+ daddr = xfrm->coaddr;
+ else if (!(xfrm->type->flags & XFRM_TYPE_LOCAL_COADDR))
+ daddr = &xfrm->id.daddr;
+ }
+ return daddr;
+}
+
+static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
+ struct sk_buff *skb,
+ const void *daddr)
+{
+ const struct dst_entry *path = xfrm_dst_path(dst);
+
+ if (!skb)
+ daddr = xfrm_get_dst_nexthop(dst, daddr);
+ return path->ops->neigh_lookup(path, skb, daddr);
+}
+
+static void xfrm_confirm_neigh(const struct dst_entry *dst, const void *daddr)
+{
+ const struct dst_entry *path = xfrm_dst_path(dst);
+
+ daddr = xfrm_get_dst_nexthop(dst, daddr);
+ path->ops->confirm_neigh(path, daddr);
+}
+
+int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family)
+{
+ int err = 0;
+
+ if (WARN_ON(family >= ARRAY_SIZE(xfrm_policy_afinfo)))
+ return -EAFNOSUPPORT;
+
+ spin_lock(&xfrm_policy_afinfo_lock);
+ if (unlikely(xfrm_policy_afinfo[family] != NULL))
+ err = -EEXIST;
+ else {
+ struct dst_ops *dst_ops = afinfo->dst_ops;
+ if (likely(dst_ops->kmem_cachep == NULL))
+ dst_ops->kmem_cachep = xfrm_dst_cache;
+ if (likely(dst_ops->check == NULL))
+ dst_ops->check = xfrm_dst_check;
+ if (likely(dst_ops->default_advmss == NULL))
+ dst_ops->default_advmss = xfrm_default_advmss;
+ if (likely(dst_ops->mtu == NULL))
+ dst_ops->mtu = xfrm_mtu;
+ if (likely(dst_ops->negative_advice == NULL))
+ dst_ops->negative_advice = xfrm_negative_advice;
+ if (likely(dst_ops->link_failure == NULL))
+ dst_ops->link_failure = xfrm_link_failure;
+ if (likely(dst_ops->neigh_lookup == NULL))
+ dst_ops->neigh_lookup = xfrm_neigh_lookup;
+ if (likely(!dst_ops->confirm_neigh))
+ dst_ops->confirm_neigh = xfrm_confirm_neigh;
+ rcu_assign_pointer(xfrm_policy_afinfo[family], afinfo);
+ }
+ spin_unlock(&xfrm_policy_afinfo_lock);
+
+ return err;
+}
+EXPORT_SYMBOL(xfrm_policy_register_afinfo);
+
+void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo)
+{
+ struct dst_ops *dst_ops = afinfo->dst_ops;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(xfrm_policy_afinfo); i++) {
+ if (xfrm_policy_afinfo[i] != afinfo)
+ continue;
+ RCU_INIT_POINTER(xfrm_policy_afinfo[i], NULL);
+ break;
+ }
+
+ synchronize_rcu();
+
+ dst_ops->kmem_cachep = NULL;
+ dst_ops->check = NULL;
+ dst_ops->negative_advice = NULL;
+ dst_ops->link_failure = NULL;
+}
+EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
+
+void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb)
+{
+ spin_lock(&xfrm_if_cb_lock);
+ rcu_assign_pointer(xfrm_if_cb, ifcb);
+ spin_unlock(&xfrm_if_cb_lock);
+}
+EXPORT_SYMBOL(xfrm_if_register_cb);
+
+void xfrm_if_unregister_cb(void)
+{
+ RCU_INIT_POINTER(xfrm_if_cb, NULL);
+ synchronize_rcu();
+}
+EXPORT_SYMBOL(xfrm_if_unregister_cb);
+
+#ifdef CONFIG_XFRM_STATISTICS
+static int __net_init xfrm_statistics_init(struct net *net)
+{
+ int rv;
+ net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib);
+ if (!net->mib.xfrm_statistics)
+ return -ENOMEM;
+ rv = xfrm_proc_init(net);
+ if (rv < 0)
+ free_percpu(net->mib.xfrm_statistics);
+ return rv;
+}
+
+static void xfrm_statistics_fini(struct net *net)
+{
+ xfrm_proc_fini(net);
+ free_percpu(net->mib.xfrm_statistics);
+}
+#else
+static int __net_init xfrm_statistics_init(struct net *net)
+{
+ return 0;
+}
+
+static void xfrm_statistics_fini(struct net *net)
+{
+}
+#endif
+
+static int __net_init xfrm_policy_init(struct net *net)
+{
+ unsigned int hmask, sz;
+ int dir;
+
+ if (net_eq(net, &init_net))
+ xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
+ sizeof(struct xfrm_dst),
+ 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
+ NULL);
+
+ hmask = 8 - 1;
+ sz = (hmask+1) * sizeof(struct hlist_head);
+
+ net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
+ if (!net->xfrm.policy_byidx)
+ goto out_byidx;
+ net->xfrm.policy_idx_hmask = hmask;
+
+ for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
+ struct xfrm_policy_hash *htab;
+
+ net->xfrm.policy_count[dir] = 0;
+ net->xfrm.policy_count[XFRM_POLICY_MAX + dir] = 0;
+ INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
+
+ htab = &net->xfrm.policy_bydst[dir];
+ htab->table = xfrm_hash_alloc(sz);
+ if (!htab->table)
+ goto out_bydst;
+ htab->hmask = hmask;
+ htab->dbits4 = 32;
+ htab->sbits4 = 32;
+ htab->dbits6 = 128;
+ htab->sbits6 = 128;
+ }
+ net->xfrm.policy_hthresh.lbits4 = 32;
+ net->xfrm.policy_hthresh.rbits4 = 32;
+ net->xfrm.policy_hthresh.lbits6 = 128;
+ net->xfrm.policy_hthresh.rbits6 = 128;
+
+ seqlock_init(&net->xfrm.policy_hthresh.lock);
+
+ INIT_LIST_HEAD(&net->xfrm.policy_all);
+ INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
+ INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild);
+ return 0;
+
+out_bydst:
+ for (dir--; dir >= 0; dir--) {
+ struct xfrm_policy_hash *htab;
+
+ htab = &net->xfrm.policy_bydst[dir];
+ xfrm_hash_free(htab->table, sz);
+ }
+ xfrm_hash_free(net->xfrm.policy_byidx, sz);
+out_byidx:
+ return -ENOMEM;
+}
+
+static void xfrm_policy_fini(struct net *net)
+{
+ unsigned int sz;
+ int dir;
+
+ flush_work(&net->xfrm.policy_hash_work);
+#ifdef CONFIG_XFRM_SUB_POLICY
+ xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false);
+#endif
+ xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false);
+
+ WARN_ON(!list_empty(&net->xfrm.policy_all));
+
+ for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
+ struct xfrm_policy_hash *htab;
+
+ WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
+
+ htab = &net->xfrm.policy_bydst[dir];
+ sz = (htab->hmask + 1) * sizeof(struct hlist_head);
+ WARN_ON(!hlist_empty(htab->table));
+ xfrm_hash_free(htab->table, sz);
+ }
+
+ sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
+ WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
+ xfrm_hash_free(net->xfrm.policy_byidx, sz);
+}
+
+static int __net_init xfrm_net_init(struct net *net)
+{
+ int rv;
+
+ /* Initialize the per-net locks here */
+ spin_lock_init(&net->xfrm.xfrm_state_lock);
+ spin_lock_init(&net->xfrm.xfrm_policy_lock);
+ mutex_init(&net->xfrm.xfrm_cfg_mutex);
+
+ rv = xfrm_statistics_init(net);
+ if (rv < 0)
+ goto out_statistics;
+ rv = xfrm_state_init(net);
+ if (rv < 0)
+ goto out_state;
+ rv = xfrm_policy_init(net);
+ if (rv < 0)
+ goto out_policy;
+ rv = xfrm_sysctl_init(net);
+ if (rv < 0)
+ goto out_sysctl;
+
+ return 0;
+
+out_sysctl:
+ xfrm_policy_fini(net);
+out_policy:
+ xfrm_state_fini(net);
+out_state:
+ xfrm_statistics_fini(net);
+out_statistics:
+ return rv;
+}
+
+static void __net_exit xfrm_net_exit(struct net *net)
+{
+ xfrm_sysctl_fini(net);
+ xfrm_policy_fini(net);
+ xfrm_state_fini(net);
+ xfrm_statistics_fini(net);
+}
+
+static struct pernet_operations __net_initdata xfrm_net_ops = {
+ .init = xfrm_net_init,
+ .exit = xfrm_net_exit,
+};
+
+void __init xfrm_init(void)
+{
+ register_pernet_subsys(&xfrm_net_ops);
+ xfrm_dev_init();
+ seqcount_init(&xfrm_policy_hash_generation);
+ xfrm_input_init();
+
+ RCU_INIT_POINTER(xfrm_if_cb, NULL);
+ synchronize_rcu();
+}
+
+#ifdef CONFIG_AUDITSYSCALL
+static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
+ struct audit_buffer *audit_buf)
+{
+ struct xfrm_sec_ctx *ctx = xp->security;
+ struct xfrm_selector *sel = &xp->selector;
+
+ 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 (sel->family) {
+ case AF_INET:
+ audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
+ if (sel->prefixlen_s != 32)
+ audit_log_format(audit_buf, " src_prefixlen=%d",
+ sel->prefixlen_s);
+ audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
+ if (sel->prefixlen_d != 32)
+ audit_log_format(audit_buf, " dst_prefixlen=%d",
+ sel->prefixlen_d);
+ break;
+ case AF_INET6:
+ audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
+ if (sel->prefixlen_s != 128)
+ audit_log_format(audit_buf, " src_prefixlen=%d",
+ sel->prefixlen_s);
+ audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
+ if (sel->prefixlen_d != 128)
+ audit_log_format(audit_buf, " dst_prefixlen=%d",
+ sel->prefixlen_d);
+ break;
+ }
+}
+
+void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid)
+{
+ struct audit_buffer *audit_buf;
+
+ audit_buf = xfrm_audit_start("SPD-add");
+ if (audit_buf == NULL)
+ return;
+ xfrm_audit_helper_usrinfo(task_valid, audit_buf);
+ audit_log_format(audit_buf, " res=%u", result);
+ xfrm_audit_common_policyinfo(xp, audit_buf);
+ audit_log_end(audit_buf);
+}
+EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
+
+void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
+ bool task_valid)
+{
+ struct audit_buffer *audit_buf;
+
+ audit_buf = xfrm_audit_start("SPD-delete");
+ if (audit_buf == NULL)
+ return;
+ xfrm_audit_helper_usrinfo(task_valid, audit_buf);
+ audit_log_format(audit_buf, " res=%u", result);
+ xfrm_audit_common_policyinfo(xp, audit_buf);
+ audit_log_end(audit_buf);
+}
+EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
+#endif
+
+#ifdef CONFIG_XFRM_MIGRATE
+static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
+ const struct xfrm_selector *sel_tgt)
+{
+ if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
+ if (sel_tgt->family == sel_cmp->family &&
+ xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr,
+ sel_cmp->family) &&
+ xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr,
+ sel_cmp->family) &&
+ sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
+ sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
+ return true;
+ }
+ } else {
+ if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
+ return true;
+ }
+ }
+ return false;
+}
+
+static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel,
+ u8 dir, u8 type, struct net *net, u32 if_id)
+{
+ struct xfrm_policy *pol, *ret = NULL;
+ struct hlist_head *chain;
+ u32 priority = ~0U;
+
+ spin_lock_bh(&net->xfrm.xfrm_policy_lock);
+ chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir);
+ hlist_for_each_entry(pol, chain, bydst) {
+ if ((if_id == 0 || pol->if_id == if_id) &&
+ xfrm_migrate_selector_match(sel, &pol->selector) &&
+ pol->type == type) {
+ ret = pol;
+ priority = ret->priority;
+ break;
+ }
+ }
+ chain = &net->xfrm.policy_inexact[dir];
+ hlist_for_each_entry(pol, chain, bydst) {
+ if ((pol->priority >= priority) && ret)
+ break;
+
+ if ((if_id == 0 || pol->if_id == if_id) &&
+ xfrm_migrate_selector_match(sel, &pol->selector) &&
+ pol->type == type) {
+ ret = pol;
+ break;
+ }
+ }
+
+ xfrm_pol_hold(ret);
+
+ spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
+
+ return ret;
+}
+
+static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
+{
+ int match = 0;
+
+ if (t->mode == m->mode && t->id.proto == m->proto &&
+ (m->reqid == 0 || t->reqid == m->reqid)) {
+ switch (t->mode) {
+ case XFRM_MODE_TUNNEL:
+ case XFRM_MODE_BEET:
+ if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr,
+ m->old_family) &&
+ xfrm_addr_equal(&t->saddr, &m->old_saddr,
+ m->old_family)) {
+ match = 1;
+ }
+ break;
+ case XFRM_MODE_TRANSPORT:
+ /* in case of transport mode, template does not store
+ any IP addresses, hence we just compare mode and
+ protocol */
+ match = 1;
+ break;
+ default:
+ break;
+ }
+ }
+ return match;
+}
+
+/* update endpoint address(es) of template(s) */
+static int xfrm_policy_migrate(struct xfrm_policy *pol,
+ struct xfrm_migrate *m, int num_migrate)
+{
+ struct xfrm_migrate *mp;
+ int i, j, n = 0;
+
+ write_lock_bh(&pol->lock);
+ if (unlikely(pol->walk.dead)) {
+ /* target policy has been deleted */
+ write_unlock_bh(&pol->lock);
+ return -ENOENT;
+ }
+
+ for (i = 0; i < pol->xfrm_nr; i++) {
+ for (j = 0, mp = m; j < num_migrate; j++, mp++) {
+ if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
+ continue;
+ n++;
+ if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
+ pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
+ continue;
+ /* update endpoints */
+ memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
+ sizeof(pol->xfrm_vec[i].id.daddr));
+ memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
+ sizeof(pol->xfrm_vec[i].saddr));
+ pol->xfrm_vec[i].encap_family = mp->new_family;
+ /* flush bundles */
+ atomic_inc(&pol->genid);
+ }
+ }
+
+ write_unlock_bh(&pol->lock);
+
+ if (!n)
+ return -ENODATA;
+
+ return 0;
+}
+
+static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
+{
+ int i, j;
+
+ if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
+ return -EINVAL;
+
+ for (i = 0; i < num_migrate; i++) {
+ if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
+ xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
+ return -EINVAL;
+
+ /* check if there is any duplicated entry */
+ for (j = i + 1; j < num_migrate; j++) {
+ if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
+ sizeof(m[i].old_daddr)) &&
+ !memcmp(&m[i].old_saddr, &m[j].old_saddr,
+ sizeof(m[i].old_saddr)) &&
+ m[i].proto == m[j].proto &&
+ m[i].mode == m[j].mode &&
+ m[i].reqid == m[j].reqid &&
+ m[i].old_family == m[j].old_family)
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
+ struct xfrm_migrate *m, int num_migrate,
+ struct xfrm_kmaddress *k, struct net *net,
+ struct xfrm_encap_tmpl *encap, u32 if_id)
+{
+ int i, err, nx_cur = 0, nx_new = 0;
+ struct xfrm_policy *pol = NULL;
+ struct xfrm_state *x, *xc;
+ struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
+ struct xfrm_state *x_new[XFRM_MAX_DEPTH];
+ struct xfrm_migrate *mp;
+
+ /* Stage 0 - sanity checks */
+ if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
+ goto out;
+
+ if (dir >= XFRM_POLICY_MAX) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ /* Stage 1 - find policy */
+ if ((pol = xfrm_migrate_policy_find(sel, dir, type, net, if_id)) == NULL) {
+ err = -ENOENT;
+ goto out;
+ }
+
+ /* Stage 2 - find and update state(s) */
+ for (i = 0, mp = m; i < num_migrate; i++, mp++) {
+ if ((x = xfrm_migrate_state_find(mp, net, if_id))) {
+ x_cur[nx_cur] = x;
+ nx_cur++;
+ xc = xfrm_state_migrate(x, mp, encap);
+ if (xc) {
+ x_new[nx_new] = xc;
+ nx_new++;
+ } else {
+ err = -ENODATA;
+ goto restore_state;
+ }
+ }
+ }
+
+ /* Stage 3 - update policy */
+ if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
+ goto restore_state;
+
+ /* Stage 4 - delete old state(s) */
+ if (nx_cur) {
+ xfrm_states_put(x_cur, nx_cur);
+ xfrm_states_delete(x_cur, nx_cur);
+ }
+
+ /* Stage 5 - announce */
+ km_migrate(sel, dir, type, m, num_migrate, k, encap);
+
+ xfrm_pol_put(pol);
+
+ return 0;
+out:
+ return err;
+
+restore_state:
+ if (pol)
+ xfrm_pol_put(pol);
+ if (nx_cur)
+ xfrm_states_put(x_cur, nx_cur);
+ if (nx_new)
+ xfrm_states_delete(x_new, nx_new);
+
+ return err;
+}
+EXPORT_SYMBOL(xfrm_migrate);
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 04:16:49 +0000