| /* |
| * 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/audit.h> |
| #include <net/dst.h> |
| #include <net/xfrm.h> |
| #include <net/ip.h> |
| #ifdef CONFIG_XFRM_STATISTICS |
| #include <net/snmp.h> |
| #endif |
| |
| #include "xfrm_hash.h" |
| |
| DEFINE_MUTEX(xfrm_cfg_mutex); |
| EXPORT_SYMBOL(xfrm_cfg_mutex); |
| |
| static DEFINE_SPINLOCK(xfrm_policy_sk_bundle_lock); |
| static struct dst_entry *xfrm_policy_sk_bundles; |
| static DEFINE_RWLOCK(xfrm_policy_lock); |
| |
| static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); |
| static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; |
| |
| static struct kmem_cache *xfrm_dst_cache __read_mostly; |
| |
| static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); |
| static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); |
| static void xfrm_init_pmtu(struct dst_entry *dst); |
| static int stale_bundle(struct dst_entry *dst); |
| |
| static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, |
| int dir); |
| |
| static inline int |
| __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) |
| { |
| return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && |
| addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && |
| !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && |
| !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && |
| (fl->proto == sel->proto || !sel->proto) && |
| (fl->oif == sel->ifindex || !sel->ifindex); |
| } |
| |
| static inline int |
| __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) |
| { |
| return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && |
| addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && |
| !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && |
| !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && |
| (fl->proto == sel->proto || !sel->proto) && |
| (fl->oif == sel->ifindex || !sel->ifindex); |
| } |
| |
| int xfrm_selector_match(struct xfrm_selector *sel, 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 0; |
| } |
| |
| static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, |
| xfrm_address_t *saddr, |
| xfrm_address_t *daddr, |
| int family) |
| { |
| 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, saddr, daddr); |
| |
| xfrm_policy_put_afinfo(afinfo); |
| |
| return dst; |
| } |
| |
| static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
| xfrm_address_t *prev_saddr, |
| xfrm_address_t *prev_daddr, |
| int family) |
| { |
| 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, saddr, daddr, family); |
| |
| 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(unsigned long data) |
| { |
| struct xfrm_policy *xp = (struct xfrm_policy*)data; |
| unsigned long now = get_seconds(); |
| long next = LONG_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) { |
| long 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) { |
| long 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) { |
| long 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) { |
| long 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 != LONG_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); |
| } |
| |
| static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo) |
| { |
| struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); |
| |
| if (unlikely(pol->walk.dead)) |
| flo = NULL; |
| else |
| xfrm_pol_hold(pol); |
| |
| return flo; |
| } |
| |
| static int xfrm_policy_flo_check(struct flow_cache_object *flo) |
| { |
| struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); |
| |
| return !pol->walk.dead; |
| } |
| |
| static void xfrm_policy_flo_delete(struct flow_cache_object *flo) |
| { |
| xfrm_pol_put(container_of(flo, struct xfrm_policy, flo)); |
| } |
| |
| static const struct flow_cache_ops xfrm_policy_fc_ops = { |
| .get = xfrm_policy_flo_get, |
| .check = xfrm_policy_flo_check, |
| .delete = xfrm_policy_flo_delete, |
| }; |
| |
| /* 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); |
| atomic_set(&policy->refcnt, 1); |
| setup_timer(&policy->timer, xfrm_policy_timer, |
| (unsigned long)policy); |
| policy->flo.ops = &xfrm_policy_fc_ops; |
| } |
| return policy; |
| } |
| EXPORT_SYMBOL(xfrm_policy_alloc); |
| |
| /* 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)) |
| BUG(); |
| |
| security_xfrm_policy_free(policy->security); |
| kfree(policy); |
| } |
| EXPORT_SYMBOL(xfrm_policy_destroy); |
| |
| /* Rule must be locked. Release descentant resources, announce |
| * entry dead. The rule must be unlinked from lists to the moment. |
| */ |
| |
| static void xfrm_policy_kill(struct xfrm_policy *policy) |
| { |
| policy->walk.dead = 1; |
| |
| atomic_inc(&policy->genid); |
| |
| 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); |
| } |
| |
| static struct hlist_head *policy_hash_bysel(struct net *net, struct xfrm_selector *sel, unsigned short family, int dir) |
| { |
| unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
| unsigned int hash = __sel_hash(sel, family, hmask); |
| |
| return (hash == hmask + 1 ? |
| &net->xfrm.policy_inexact[dir] : |
| net->xfrm.policy_bydst[dir].table + hash); |
| } |
| |
| static struct hlist_head *policy_hash_direct(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) |
| { |
| unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
| unsigned int hash = __addr_hash(daddr, saddr, family, hmask); |
| |
| return net->xfrm.policy_bydst[dir].table + hash; |
| } |
| |
| static void xfrm_dst_hash_transfer(struct hlist_head *list, |
| struct hlist_head *ndsttable, |
| unsigned int nhashmask) |
| { |
| struct hlist_node *entry, *tmp, *entry0 = NULL; |
| struct xfrm_policy *pol; |
| unsigned int h0 = 0; |
| |
| redo: |
| hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { |
| unsigned int h; |
| |
| h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, |
| pol->family, nhashmask); |
| if (!entry0) { |
| hlist_del(entry); |
| hlist_add_head(&pol->bydst, ndsttable+h); |
| h0 = h; |
| } else { |
| if (h != h0) |
| continue; |
| hlist_del(entry); |
| hlist_add_after(entry0, &pol->bydst); |
| } |
| entry0 = entry; |
| } |
| 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 *entry, *tmp; |
| struct xfrm_policy *pol; |
| |
| hlist_for_each_entry_safe(pol, entry, 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 *odst = net->xfrm.policy_bydst[dir].table; |
| struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
| int i; |
| |
| if (!ndst) |
| return; |
| |
| write_lock_bh(&xfrm_policy_lock); |
| |
| for (i = hmask; i >= 0; i--) |
| xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); |
| |
| net->xfrm.policy_bydst[dir].table = ndst; |
| net->xfrm.policy_bydst[dir].hmask = nhashmask; |
| |
| write_unlock_bh(&xfrm_policy_lock); |
| |
| 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; |
| |
| write_lock_bh(&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; |
| |
| write_unlock_bh(&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) |
| { |
| read_lock_bh(&xfrm_policy_lock); |
| 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; |
| read_unlock_bh(&xfrm_policy_lock); |
| } |
| 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 * 2; 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); |
| } |
| |
| /* 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) |
| { |
| static u32 idx_generator; |
| |
| for (;;) { |
| struct hlist_node *entry; |
| struct hlist_head *list; |
| struct xfrm_policy *p; |
| u32 idx; |
| int found; |
| |
| idx = (idx_generator | dir); |
| idx_generator += 8; |
| if (idx == 0) |
| idx = 8; |
| list = net->xfrm.policy_byidx + idx_hash(net, idx); |
| found = 0; |
| hlist_for_each_entry(p, entry, 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; |
| } |
| |
| 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 *entry, *newpos; |
| u32 mark = policy->mark.v & policy->mark.m; |
| |
| write_lock_bh(&xfrm_policy_lock); |
| chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); |
| delpol = NULL; |
| newpos = NULL; |
| hlist_for_each_entry(pol, entry, chain, bydst) { |
| if (pol->type == policy->type && |
| !selector_cmp(&pol->selector, &policy->selector) && |
| (mark & pol->mark.m) == pol->mark.v && |
| xfrm_sec_ctx_match(pol->security, policy->security) && |
| !WARN_ON(delpol)) { |
| if (excl) { |
| write_unlock_bh(&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_after(newpos, &policy->bydst); |
| else |
| hlist_add_head(&policy->bydst, chain); |
| xfrm_pol_hold(policy); |
| net->xfrm.policy_count[dir]++; |
| atomic_inc(&flow_cache_genid); |
| if (delpol) |
| __xfrm_policy_unlink(delpol, dir); |
| policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir); |
| hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); |
| policy->curlft.add_time = get_seconds(); |
| policy->curlft.use_time = 0; |
| if (!mod_timer(&policy->timer, jiffies + HZ)) |
| xfrm_pol_hold(policy); |
| list_add(&policy->walk.all, &net->xfrm.policy_all); |
| write_unlock_bh(&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, u32 mark, 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; |
| struct hlist_node *entry; |
| |
| *err = 0; |
| write_lock_bh(&xfrm_policy_lock); |
| chain = policy_hash_bysel(net, sel, sel->family, dir); |
| ret = NULL; |
| hlist_for_each_entry(pol, entry, chain, bydst) { |
| if (pol->type == type && |
| (mark & pol->mark.m) == pol->mark.v && |
| !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) { |
| write_unlock_bh(&xfrm_policy_lock); |
| return pol; |
| } |
| __xfrm_policy_unlink(pol, dir); |
| } |
| ret = pol; |
| break; |
| } |
| } |
| write_unlock_bh(&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, u32 mark, u8 type, |
| int dir, u32 id, int delete, int *err) |
| { |
| struct xfrm_policy *pol, *ret; |
| struct hlist_head *chain; |
| struct hlist_node *entry; |
| |
| *err = -ENOENT; |
| if (xfrm_policy_id2dir(id) != dir) |
| return NULL; |
| |
| *err = 0; |
| write_lock_bh(&xfrm_policy_lock); |
| chain = net->xfrm.policy_byidx + idx_hash(net, id); |
| ret = NULL; |
| hlist_for_each_entry(pol, entry, chain, byidx) { |
| if (pol->type == type && pol->index == id && |
| (mark & pol->mark.m) == pol->mark.v) { |
| xfrm_pol_hold(pol); |
| if (delete) { |
| *err = security_xfrm_policy_delete( |
| pol->security); |
| if (*err) { |
| write_unlock_bh(&xfrm_policy_lock); |
| return pol; |
| } |
| __xfrm_policy_unlink(pol, dir); |
| } |
| ret = pol; |
| break; |
| } |
| } |
| write_unlock_bh(&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, struct xfrm_audit *audit_info) |
| { |
| int dir, err = 0; |
| |
| for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
| struct xfrm_policy *pol; |
| struct hlist_node *entry; |
| int i; |
| |
| hlist_for_each_entry(pol, entry, |
| &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, |
| audit_info->loginuid, |
| audit_info->sessionid, |
| audit_info->secid); |
| return err; |
| } |
| } |
| for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
| hlist_for_each_entry(pol, entry, |
| 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, |
| audit_info->loginuid, |
| audit_info->sessionid, |
| audit_info->secid); |
| return err; |
| } |
| } |
| } |
| } |
| return err; |
| } |
| #else |
| static inline int |
| xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
| { |
| return 0; |
| } |
| #endif |
| |
| int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info) |
| { |
| int dir, err = 0, cnt = 0; |
| |
| write_lock_bh(&xfrm_policy_lock); |
| |
| err = xfrm_policy_flush_secctx_check(net, type, audit_info); |
| if (err) |
| goto out; |
| |
| for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
| struct xfrm_policy *pol; |
| struct hlist_node *entry; |
| int i; |
| |
| again1: |
| hlist_for_each_entry(pol, entry, |
| &net->xfrm.policy_inexact[dir], bydst) { |
| if (pol->type != type) |
| continue; |
| __xfrm_policy_unlink(pol, dir); |
| write_unlock_bh(&xfrm_policy_lock); |
| cnt++; |
| |
| xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
| audit_info->sessionid, |
| audit_info->secid); |
| |
| xfrm_policy_kill(pol); |
| |
| write_lock_bh(&xfrm_policy_lock); |
| goto again1; |
| } |
| |
| for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
| again2: |
| hlist_for_each_entry(pol, entry, |
| net->xfrm.policy_bydst[dir].table + i, |
| bydst) { |
| if (pol->type != type) |
| continue; |
| __xfrm_policy_unlink(pol, dir); |
| write_unlock_bh(&xfrm_policy_lock); |
| cnt++; |
| |
| xfrm_audit_policy_delete(pol, 1, |
| audit_info->loginuid, |
| audit_info->sessionid, |
| audit_info->secid); |
| xfrm_policy_kill(pol); |
| |
| write_lock_bh(&xfrm_policy_lock); |
| goto again2; |
| } |
| } |
| |
| } |
| if (!cnt) |
| err = -ESRCH; |
| out: |
| write_unlock_bh(&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; |
| |
| write_lock_bh(&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_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: |
| write_unlock_bh(&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) |
| { |
| if (list_empty(&walk->walk.all)) |
| return; |
| |
| write_lock_bh(&xfrm_policy_lock); |
| list_del(&walk->walk.all); |
| write_unlock_bh(&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(struct xfrm_policy *pol, struct flowi *fl, |
| u8 type, u16 family, int dir) |
| { |
| struct xfrm_selector *sel = &pol->selector; |
| int match, ret = -ESRCH; |
| |
| if (pol->family != family || |
| (fl->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->secid, |
| dir); |
| |
| return ret; |
| } |
| |
| static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, |
| struct flowi *fl, |
| u16 family, u8 dir) |
| { |
| int err; |
| struct xfrm_policy *pol, *ret; |
| xfrm_address_t *daddr, *saddr; |
| struct hlist_node *entry; |
| struct hlist_head *chain; |
| u32 priority = ~0U; |
| |
| daddr = xfrm_flowi_daddr(fl, family); |
| saddr = xfrm_flowi_saddr(fl, family); |
| if (unlikely(!daddr || !saddr)) |
| return NULL; |
| |
| read_lock_bh(&xfrm_policy_lock); |
| chain = policy_hash_direct(net, daddr, saddr, family, dir); |
| ret = NULL; |
| hlist_for_each_entry(pol, entry, chain, bydst) { |
| err = xfrm_policy_match(pol, fl, type, family, dir); |
| 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(pol, entry, chain, bydst) { |
| err = xfrm_policy_match(pol, fl, type, family, dir); |
| if (err) { |
| if (err == -ESRCH) |
| continue; |
| else { |
| ret = ERR_PTR(err); |
| goto fail; |
| } |
| } else if (pol->priority < priority) { |
| ret = pol; |
| break; |
| } |
| } |
| if (ret) |
| xfrm_pol_hold(ret); |
| fail: |
| read_unlock_bh(&xfrm_policy_lock); |
| |
| return ret; |
| } |
| |
| static struct xfrm_policy * |
| __xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir) |
| { |
| #ifdef CONFIG_XFRM_SUB_POLICY |
| struct xfrm_policy *pol; |
| |
| pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); |
| if (pol != NULL) |
| return pol; |
| #endif |
| return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); |
| } |
| |
| static struct flow_cache_object * |
| xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family, |
| u8 dir, struct flow_cache_object *old_obj, void *ctx) |
| { |
| struct xfrm_policy *pol; |
| |
| if (old_obj) |
| xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo)); |
| |
| pol = __xfrm_policy_lookup(net, fl, family, dir); |
| if (IS_ERR_OR_NULL(pol)) |
| return ERR_CAST(pol); |
| |
| /* Resolver returns two references: |
| * one for cache and one for caller of flow_cache_lookup() */ |
| xfrm_pol_hold(pol); |
| |
| return &pol->flo; |
| } |
| |
| static inline int policy_to_flow_dir(int dir) |
| { |
| if (XFRM_POLICY_IN == FLOW_DIR_IN && |
| XFRM_POLICY_OUT == FLOW_DIR_OUT && |
| XFRM_POLICY_FWD == FLOW_DIR_FWD) |
| return dir; |
| switch (dir) { |
| default: |
| case XFRM_POLICY_IN: |
| return FLOW_DIR_IN; |
| case XFRM_POLICY_OUT: |
| return FLOW_DIR_OUT; |
| case XFRM_POLICY_FWD: |
| return FLOW_DIR_FWD; |
| } |
| } |
| |
| static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
| { |
| struct xfrm_policy *pol; |
| |
| read_lock_bh(&xfrm_policy_lock); |
| if ((pol = sk->sk_policy[dir]) != NULL) { |
| int match = xfrm_selector_match(&pol->selector, fl, |
| sk->sk_family); |
| int err = 0; |
| |
| if (match) { |
| if ((sk->sk_mark & pol->mark.m) != pol->mark.v) { |
| pol = NULL; |
| goto out; |
| } |
| err = security_xfrm_policy_lookup(pol->security, |
| fl->secid, |
| policy_to_flow_dir(dir)); |
| if (!err) |
| xfrm_pol_hold(pol); |
| else if (err == -ESRCH) |
| pol = NULL; |
| else |
| pol = ERR_PTR(err); |
| } else |
| pol = NULL; |
| } |
| out: |
| read_unlock_bh(&xfrm_policy_lock); |
| return pol; |
| } |
| |
| static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) |
| { |
| struct net *net = xp_net(pol); |
| struct hlist_head *chain = policy_hash_bysel(net, &pol->selector, |
| pol->family, dir); |
| |
| list_add(&pol->walk.all, &net->xfrm.policy_all); |
| hlist_add_head(&pol->bydst, chain); |
| hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index)); |
| net->xfrm.policy_count[dir]++; |
| xfrm_pol_hold(pol); |
| |
| if (xfrm_bydst_should_resize(net, dir, NULL)) |
| schedule_work(&net->xfrm.policy_hash_work); |
| } |
| |
| static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, |
| int dir) |
| { |
| struct net *net = xp_net(pol); |
| |
| if (hlist_unhashed(&pol->bydst)) |
| return NULL; |
| |
| hlist_del(&pol->bydst); |
| hlist_del(&pol->byidx); |
| list_del(&pol->walk.all); |
| net->xfrm.policy_count[dir]--; |
| |
| return pol; |
| } |
| |
| int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
| { |
| write_lock_bh(&xfrm_policy_lock); |
| pol = __xfrm_policy_unlink(pol, dir); |
| write_unlock_bh(&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 = xp_net(pol); |
| struct xfrm_policy *old_pol; |
| |
| #ifdef CONFIG_XFRM_SUB_POLICY |
| if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) |
| return -EINVAL; |
| #endif |
| |
| write_lock_bh(&xfrm_policy_lock); |
| old_pol = sk->sk_policy[dir]; |
| sk->sk_policy[dir] = pol; |
| if (pol) { |
| pol->curlft.add_time = get_seconds(); |
| pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir); |
| __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
| } |
| if (old_pol) |
| /* Unlinking succeeds always. This is the only function |
| * allowed to delete or replace socket policy. |
| */ |
| __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); |
| write_unlock_bh(&xfrm_policy_lock); |
| |
| if (old_pol) { |
| xfrm_policy_kill(old_pol); |
| } |
| return 0; |
| } |
| |
| static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) |
| { |
| struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
| |
| 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->action = old->action; |
| newp->flags = old->flags; |
| newp->xfrm_nr = old->xfrm_nr; |
| newp->index = old->index; |
| newp->type = old->type; |
| memcpy(newp->xfrm_vec, old->xfrm_vec, |
| newp->xfrm_nr*sizeof(struct xfrm_tmpl)); |
| write_lock_bh(&xfrm_policy_lock); |
| __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); |
| write_unlock_bh(&xfrm_policy_lock); |
| xfrm_pol_put(newp); |
| } |
| return newp; |
| } |
| |
| int __xfrm_sk_clone_policy(struct sock *sk) |
| { |
| struct xfrm_policy *p0 = sk->sk_policy[0], |
| *p1 = sk->sk_policy[1]; |
| |
| sk->sk_policy[0] = sk->sk_policy[1] = NULL; |
| if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) |
| return -ENOMEM; |
| if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| static int |
| xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote, |
| unsigned short family) |
| { |
| int err; |
| struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
| |
| if (unlikely(afinfo == NULL)) |
| return -EINVAL; |
| err = afinfo->get_saddr(net, local, remote); |
| xfrm_policy_put_afinfo(afinfo); |
| return err; |
| } |
| |
| /* Resolve list of templates for the flow, given policy. */ |
| |
| static int |
| xfrm_tmpl_resolve_one(struct xfrm_policy *policy, 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; |
| family = tmpl->encap_family; |
| if (xfrm_addr_any(local, family)) { |
| error = xfrm_get_saddr(net, &tmp, remote, family); |
| if (error) |
| goto fail; |
| local = &tmp; |
| } |
| } |
| |
| x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); |
| |
| 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, 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; |
| |
| } |
| |
| /* Check that the bundle accepts the flow and its components are |
| * still valid. |
| */ |
| |
| static inline int xfrm_get_tos(struct flowi *fl, int family) |
| { |
| struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
| int tos; |
| |
| if (!afinfo) |
| return -EINVAL; |
| |
| tos = afinfo->get_tos(fl); |
| |
| xfrm_policy_put_afinfo(afinfo); |
| |
| return tos; |
| } |
| |
| static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo) |
| { |
| struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); |
| struct dst_entry *dst = &xdst->u.dst; |
| |
| if (xdst->route == NULL) { |
| /* Dummy bundle - if it has xfrms we were not |
| * able to build bundle as template resolution failed. |
| * It means we need to try again resolving. */ |
| if (xdst->num_xfrms > 0) |
| return NULL; |
| } else { |
| /* Real bundle */ |
| if (stale_bundle(dst)) |
| return NULL; |
| } |
| |
| dst_hold(dst); |
| return flo; |
| } |
| |
| static int xfrm_bundle_flo_check(struct flow_cache_object *flo) |
| { |
| struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); |
| struct dst_entry *dst = &xdst->u.dst; |
| |
| if (!xdst->route) |
| return 0; |
| if (stale_bundle(dst)) |
| return 0; |
| |
| return 1; |
| } |
| |
| static void xfrm_bundle_flo_delete(struct flow_cache_object *flo) |
| { |
| struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); |
| struct dst_entry *dst = &xdst->u.dst; |
| |
| dst_free(dst); |
| } |
| |
| static const struct flow_cache_ops xfrm_bundle_fc_ops = { |
| .get = xfrm_bundle_flo_get, |
| .check = xfrm_bundle_flo_check, |
| .delete = xfrm_bundle_flo_delete, |
| }; |
| |
| static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family) |
| { |
| 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 defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| case AF_INET6: |
| dst_ops = &net->xfrm.xfrm6_dst_ops; |
| break; |
| #endif |
| default: |
| BUG(); |
| } |
| xdst = dst_alloc(dst_ops) ?: ERR_PTR(-ENOBUFS); |
| xfrm_policy_put_afinfo(afinfo); |
| |
| xdst->flo.ops = &xfrm_bundle_fc_ops; |
| |
| return xdst; |
| } |
| |
| static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
| int nfheader_len) |
| { |
| 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); |
| |
| xfrm_policy_put_afinfo(afinfo); |
| |
| return err; |
| } |
| |
| static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
| struct flowi *fl) |
| { |
| 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); |
| |
| xfrm_policy_put_afinfo(afinfo); |
| |
| 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, int nx, |
| struct flowi *fl, |
| struct dst_entry *dst) |
| { |
| struct net *net = xp_net(policy); |
| unsigned long now = jiffies; |
| struct net_device *dev; |
| struct dst_entry *dst_prev = NULL; |
| struct dst_entry *dst0 = 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); |
| err = tos; |
| if (tos < 0) |
| goto put_states; |
| |
| 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; |
| } |
| |
| if (!dst_prev) |
| dst0 = dst1; |
| else { |
| dst_prev->child = dst_clone(dst1); |
| dst1->flags |= DST_NOHASH; |
| } |
| |
| xdst->route = dst; |
| memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics)); |
| |
| if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { |
| family = xfrm[i]->props.family; |
| dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, |
| family); |
| 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 = -1; |
| dst1->flags |= DST_HOST; |
| dst1->lastuse = now; |
| |
| dst1->input = dst_discard; |
| dst1->output = xfrm[i]->outer_mode->afinfo->output; |
| |
| dst1->next = dst_prev; |
| dst_prev = dst1; |
| |
| 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; |
| } |
| |
| dst_prev->child = dst; |
| dst0->path = dst; |
| |
| err = -ENODEV; |
| dev = dst->dev; |
| if (!dev) |
| goto free_dst; |
| |
| /* Copy neighbour for reachability confirmation */ |
| dst0->neighbour = neigh_clone(dst->neighbour); |
| |
| xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
| xfrm_init_pmtu(dst_prev); |
| |
| for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { |
| struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; |
| |
| err = xfrm_fill_dst(xdst, dev, fl); |
| if (err) |
| goto free_dst; |
| |
| dst_prev->header_len = header_len; |
| dst_prev->trailer_len = trailer_len; |
| header_len -= xdst->u.dst.xfrm->props.header_len; |
| trailer_len -= xdst->u.dst.xfrm->props.trailer_len; |
| } |
| |
| out: |
| return dst0; |
| |
| put_states: |
| for (; i < nx; i++) |
| xfrm_state_put(xfrm[i]); |
| free_dst: |
| if (dst0) |
| dst_free(dst0); |
| dst0 = ERR_PTR(err); |
| goto out; |
| } |
| |
| static int inline |
| xfrm_dst_alloc_copy(void **target, void *src, int size) |
| { |
| if (!*target) { |
| *target = kmalloc(size, GFP_ATOMIC); |
| if (!*target) |
| return -ENOMEM; |
| } |
| memcpy(*target, src, size); |
| return 0; |
| } |
| |
| static int inline |
| xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) |
| { |
| #ifdef CONFIG_XFRM_SUB_POLICY |
| struct xfrm_dst *xdst = (struct xfrm_dst *)dst; |
| return xfrm_dst_alloc_copy((void **)&(xdst->partner), |
| sel, sizeof(*sel)); |
| #else |
| return 0; |
| #endif |
| } |
| |
| static int inline |
| xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) |
| { |
| #ifdef CONFIG_XFRM_SUB_POLICY |
| struct xfrm_dst *xdst = (struct xfrm_dst *)dst; |
| return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); |
| #else |
| return 0; |
| #endif |
| } |
| |
| static int xfrm_expand_policies(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); |
| 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, |
| 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 dst_entry *dst; |
| struct xfrm_dst *xdst; |
| int err; |
| |
| /* Try to instantiate a bundle */ |
| err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family); |
| if (err <= 0) { |
| if (err != 0 && err != -EAGAIN) |
| XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
| return ERR_PTR(err); |
| } |
| |
| dst = xfrm_bundle_create(pols[0], xfrm, 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; |
| if (num_pols > 1) |
| err = xfrm_dst_update_parent(dst, &pols[1]->selector); |
| else |
| err = xfrm_dst_update_origin(dst, fl); |
| if (unlikely(err)) { |
| dst_free(dst); |
| XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
| return ERR_PTR(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 struct flow_cache_object * |
| xfrm_bundle_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir, |
| struct flow_cache_object *oldflo, void *ctx) |
| { |
| struct dst_entry *dst_orig = (struct dst_entry *)ctx; |
| struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
| struct xfrm_dst *xdst, *new_xdst; |
| int num_pols = 0, num_xfrms = 0, i, err, pol_dead; |
| |
| /* Check if the policies from old bundle are usable */ |
| xdst = NULL; |
| if (oldflo) { |
| xdst = container_of(oldflo, struct xfrm_dst, flo); |
| num_pols = xdst->num_pols; |
| num_xfrms = xdst->num_xfrms; |
| pol_dead = 0; |
| for (i = 0; i < num_pols; i++) { |
| pols[i] = xdst->pols[i]; |
| pol_dead |= pols[i]->walk.dead; |
| } |
| if (pol_dead) { |
| dst_free(&xdst->u.dst); |
| xdst = NULL; |
| num_pols = 0; |
| num_xfrms = 0; |
| oldflo = NULL; |
| } |
| } |
| |
| /* Resolve policies to use if we couldn't get them from |
| * previous cache entry */ |
| if (xdst == NULL) { |
| num_pols = 1; |
| pols[0] = __xfrm_policy_lookup(net, fl, family, dir); |
| 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; |
| } |
| |
| new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig); |
| if (IS_ERR(new_xdst)) { |
| err = PTR_ERR(new_xdst); |
| if (err != -EAGAIN) |
| goto error; |
| if (oldflo == NULL) |
| goto make_dummy_bundle; |
| dst_hold(&xdst->u.dst); |
| return oldflo; |
| } else if (new_xdst == NULL) { |
| num_xfrms = 0; |
| if (oldflo == NULL) |
| goto make_dummy_bundle; |
| xdst->num_xfrms = 0; |
| dst_hold(&xdst->u.dst); |
| return oldflo; |
| } |
| |
| /* Kill the previous bundle */ |
| if (xdst) { |
| /* The policies were stolen for newly generated bundle */ |
| xdst->num_pols = 0; |
| dst_free(&xdst->u.dst); |
| } |
| |
| /* Flow cache does not have reference, it dst_free()'s, |
| * but we do need to return one reference for original caller */ |
| dst_hold(&new_xdst->u.dst); |
| return &new_xdst->flo; |
| |
| 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_alloc_dst(net, 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); |
| |
| dst_hold(&xdst->u.dst); |
| return &xdst->flo; |
| |
| inc_error: |
| XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
| error: |
| if (xdst != NULL) |
| dst_free(&xdst->u.dst); |
| else |
| xfrm_pols_put(pols, num_pols); |
| return ERR_PTR(err); |
| } |
| |
| /* 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. |
| */ |
| int __xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl, |
| struct sock *sk, int flags) |
| { |
| struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
| struct flow_cache_object *flo; |
| struct xfrm_dst *xdst; |
| struct dst_entry *dst, *dst_orig = *dst_p, *route; |
| u16 family = dst_orig->ops->family; |
| u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
| int i, err, num_pols, num_xfrms = 0, drop_pols = 0; |
| |
| restart: |
| dst = NULL; |
| xdst = NULL; |
| route = NULL; |
| |
| if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
| num_pols = 1; |
| pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
| 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); |
| goto dropdst; |
| } else if (xdst == NULL) { |
| num_xfrms = 0; |
| drop_pols = num_pols; |
| goto no_transform; |
| } |
| |
| spin_lock_bh(&xfrm_policy_sk_bundle_lock); |
| xdst->u.dst.next = xfrm_policy_sk_bundles; |
| xfrm_policy_sk_bundles = &xdst->u.dst; |
| spin_unlock_bh(&xfrm_policy_sk_bundle_lock); |
| |
| route = xdst->route; |
| } |
| } |
| |
| if (xdst == NULL) { |
| /* To accelerate a bit... */ |
| if ((dst_orig->flags & DST_NOXFRM) || |
| !net->xfrm.policy_count[XFRM_POLICY_OUT]) |
| goto nopol; |
| |
| flo = flow_cache_lookup(net, fl, family, dir, |
| xfrm_bundle_lookup, dst_orig); |
| if (flo == NULL) |
| goto nopol; |
| if (IS_ERR(flo)) { |
| err = PTR_ERR(flo); |
| goto dropdst; |
| } |
| xdst = container_of(flo, struct xfrm_dst, flo); |
| |
| 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) { |
| /* EREMOTE tells the caller to generate |
| * a one-shot blackhole route. */ |
| dst_release(dst); |
| xfrm_pols_put(pols, drop_pols); |
| XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
| return -EREMOTE; |
| } |
| if (flags & XFRM_LOOKUP_WAIT) { |
| DECLARE_WAITQUEUE(wait, current); |
| |
| add_wait_queue(&net->xfrm.km_waitq, &wait); |
| set_current_state(TASK_INTERRUPTIBLE); |
| schedule(); |
| set_current_state(TASK_RUNNING); |
| remove_wait_queue(&net->xfrm.km_waitq, &wait); |
| |
| if (!signal_pending(current)) { |
| dst_release(dst); |
| goto restart; |
| } |
| |
| err = -ERESTART; |
| } else |
| 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 = get_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_p = dst; |
| dst_release(dst_orig); |
| } else { |
| /* Flow passes untransformed */ |
| dst_release(dst); |
| } |
| ok: |
| xfrm_pols_put(pols, drop_pols); |
| return 0; |
| |
| nopol: |
| if (!(flags & XFRM_LOOKUP_ICMP)) |
| goto ok; |
| err = -ENOENT; |
| error: |
| dst_release(dst); |
| dropdst: |
| dst_release(dst_orig); |
| *dst_p = NULL; |
| xfrm_pols_put(pols, drop_pols); |
| return err; |
| } |
| EXPORT_SYMBOL(__xfrm_lookup); |
| |
| int xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl, |
| struct sock *sk, int flags) |
| { |
| int err = __xfrm_lookup(net, dst_p, fl, sk, flags); |
| |
| if (err == -EREMOTE) { |
| dst_release(*dst_p); |
| *dst_p = NULL; |
| err = -EAGAIN; |
| } |
| |
| return err; |
| } |
| EXPORT_SYMBOL(xfrm_lookup); |
| |
| static inline int |
| xfrm_secpath_reject(int idx, struct sk_buff *skb, 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(struct xfrm_tmpl *tmpl, 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(struct xfrm_tmpl *tmpl, 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) |
| { |
| 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->secid); |
| xfrm_policy_put_afinfo(afinfo); |
| return err; |
| } |
| EXPORT_SYMBOL(__xfrm_decode_session); |
| |
| static inline int secpath_has_nontransport(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; |
| u8 fl_dir; |
| int xerr_idx = -1; |
| |
| reverse = dir & ~XFRM_POLICY_MASK; |
| dir &= XFRM_POLICY_MASK; |
| fl_dir = policy_to_flow_dir(dir); |
| |
| 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; |
| if (sk && sk->sk_policy[dir]) { |
| pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
| if (IS_ERR(pol)) { |
| XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
| return 0; |
| } |
| } |
| |
| if (!pol) { |
| struct flow_cache_object *flo; |
| |
| flo = flow_cache_lookup(net, &fl, family, fl_dir, |
| xfrm_policy_lookup, NULL); |
| if (IS_ERR_OR_NULL(flo)) |
| pol = ERR_CAST(flo); |
| else |
| pol = container_of(flo, struct xfrm_policy, flo); |
| } |
| |
| 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 = get_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 (pols[1]) { |
| if (IS_ERR(pols[1])) { |
| XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
| return 0; |
| } |
| pols[1]->curlft.use_time = get_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); |
| 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; |
| |
| if (xfrm_decode_session(skb, &fl, family) < 0) { |
| XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); |
| return 0; |
| } |
| |
| skb_dst_force(skb); |
| dst = skb_dst(skb); |
| |
| res = xfrm_lookup(net, &dst, &fl, NULL, 0) == 0; |
| 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 "-1" 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 policy's bundle is pruned, we dst_free() the XFRM |
| * dst which causes it's ->obsolete field to be set to a |
| * positive non-zero integer. If an XFRM dst has been pruned |
| * like this, we want to force a new route lookup. |
| */ |
| if (dst->obsolete < 0 && !stale_bundle(dst)) |
| return dst; |
| |
| return NULL; |
| } |
| |
| static int stale_bundle(struct dst_entry *dst) |
| { |
| return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
| } |
| |
| void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
| { |
| while ((dst = dst->child) && 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_garbage_collect(struct net *net) |
| { |
| struct dst_entry *head, *next; |
| |
| flow_cache_flush(); |
| |
| spin_lock_bh(&xfrm_policy_sk_bundle_lock); |
| head = xfrm_policy_sk_bundles; |
| xfrm_policy_sk_bundles = NULL; |
| spin_unlock_bh(&xfrm_policy_sk_bundle_lock); |
| |
| while (head) { |
| next = head->next; |
| dst_free(head); |
| head = next; |
| } |
| } |
| |
| static void xfrm_init_pmtu(struct dst_entry *dst) |
| { |
| do { |
| struct xfrm_dst *xdst = (struct xfrm_dst *)dst; |
| u32 pmtu, route_mtu_cached; |
| |
| pmtu = dst_mtu(dst->child); |
| 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->metrics[RTAX_MTU-1] = pmtu; |
| } while ((dst = dst->next)); |
| } |
| |
| /* Check that the bundle accepts the flow and its components are |
| * still valid. |
| */ |
| |
| int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
| struct flowi *fl, int family, int strict) |
| { |
| struct dst_entry *dst = &first->u.dst; |
| struct xfrm_dst *last; |
| u32 mtu; |
| |
| if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
| (dst->dev && !netif_running(dst->dev))) |
| return 0; |
| #ifdef CONFIG_XFRM_SUB_POLICY |
| if (fl) { |
| if (first->origin && !flow_cache_uli_match(first->origin, fl)) |
| return 0; |
| if (first->partner && |
| !xfrm_selector_match(first->partner, fl, family)) |
| return 0; |
| } |
| #endif |
| |
| last = NULL; |
| |
| do { |
| struct xfrm_dst *xdst = (struct xfrm_dst *)dst; |
| |
| if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) |
| return 0; |
| if (fl && pol && |
| !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) |
| return 0; |
| 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; |
| |
| if (strict && fl && |
| !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) && |
| !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) |
| return 0; |
| |
| mtu = dst_mtu(dst->child); |
| if (xdst->child_mtu_cached != mtu) { |
| last = xdst; |
| 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) { |
| last = xdst; |
| xdst->route_mtu_cached = mtu; |
| } |
| |
| dst = dst->child; |
| } while (dst->xfrm); |
| |
| if (likely(!last)) |
| return 1; |
| |
| mtu = last->child_mtu_cached; |
| for (;;) { |
| dst = &last->u.dst; |
| |
| mtu = xfrm_state_mtu(dst->xfrm, mtu); |
| if (mtu > last->route_mtu_cached) |
| mtu = last->route_mtu_cached; |
| dst->metrics[RTAX_MTU-1] = mtu; |
| |
| if (last == first) |
| break; |
| |
| last = (struct xfrm_dst *)last->u.dst.next; |
| last->child_mtu_cached = mtu; |
| } |
| |
| return 1; |
| } |
| |
| EXPORT_SYMBOL(xfrm_bundle_ok); |
| |
| int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
| { |
| struct net *net; |
| int err = 0; |
| if (unlikely(afinfo == NULL)) |
| return -EINVAL; |
| if (unlikely(afinfo->family >= NPROTO)) |
| return -EAFNOSUPPORT; |
| write_lock_bh(&xfrm_policy_afinfo_lock); |
| if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
| err = -ENOBUFS; |
| 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->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(afinfo->garbage_collect == NULL)) |
| afinfo->garbage_collect = __xfrm_garbage_collect; |
| xfrm_policy_afinfo[afinfo->family] = afinfo; |
| } |
| write_unlock_bh(&xfrm_policy_afinfo_lock); |
| |
| rtnl_lock(); |
| for_each_net(net) { |
| struct dst_ops *xfrm_dst_ops; |
| |
| switch (afinfo->family) { |
| case AF_INET: |
| xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops; |
| break; |
| #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| case AF_INET6: |
| xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops; |
| break; |
| #endif |
| default: |
| BUG(); |
| } |
| *xfrm_dst_ops = *afinfo->dst_ops; |
| } |
| rtnl_unlock(); |
| |
| return err; |
| } |
| EXPORT_SYMBOL(xfrm_policy_register_afinfo); |
| |
| int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) |
| { |
| int err = 0; |
| if (unlikely(afinfo == NULL)) |
| return -EINVAL; |
| if (unlikely(afinfo->family >= NPROTO)) |
| return -EAFNOSUPPORT; |
| write_lock_bh(&xfrm_policy_afinfo_lock); |
| if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
| if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) |
| err = -EINVAL; |
| else { |
| struct dst_ops *dst_ops = afinfo->dst_ops; |
| xfrm_policy_afinfo[afinfo->family] = NULL; |
| dst_ops->kmem_cachep = NULL; |
| dst_ops->check = NULL; |
| dst_ops->negative_advice = NULL; |
| dst_ops->link_failure = NULL; |
| afinfo->garbage_collect = NULL; |
| } |
| } |
| write_unlock_bh(&xfrm_policy_afinfo_lock); |
| return err; |
| } |
| EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); |
| |
| static void __net_init xfrm_dst_ops_init(struct net *net) |
| { |
| struct xfrm_policy_afinfo *afinfo; |
| |
| read_lock_bh(&xfrm_policy_afinfo_lock); |
| afinfo = xfrm_policy_afinfo[AF_INET]; |
| if (afinfo) |
| net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops; |
| #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| afinfo = xfrm_policy_afinfo[AF_INET6]; |
| if (afinfo) |
| net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops; |
| #endif |
| read_unlock_bh(&xfrm_policy_afinfo_lock); |
| } |
| |
| static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) |
| { |
| struct xfrm_policy_afinfo *afinfo; |
| if (unlikely(family >= NPROTO)) |
| return NULL; |
| read_lock(&xfrm_policy_afinfo_lock); |
| afinfo = xfrm_policy_afinfo[family]; |
| if (unlikely(!afinfo)) |
| read_unlock(&xfrm_policy_afinfo_lock); |
| return afinfo; |
| } |
| |
| static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) |
| { |
| read_unlock(&xfrm_policy_afinfo_lock); |
| } |
| |
| static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
| { |
| struct net_device *dev = ptr; |
| |
| switch (event) { |
| case NETDEV_DOWN: |
| __xfrm_garbage_collect(dev_net(dev)); |
| } |
| return NOTIFY_DONE; |
| } |
| |
| static struct notifier_block xfrm_dev_notifier = { |
| .notifier_call = xfrm_dev_event, |
| }; |
| |
| #ifdef CONFIG_XFRM_STATISTICS |
| static int __net_init xfrm_statistics_init(struct net *net) |
| { |
| int rv; |
| |
| if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics, |
| sizeof(struct linux_xfrm_mib)) < 0) |
| return -ENOMEM; |
| rv = xfrm_proc_init(net); |
| if (rv < 0) |
| snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
| return rv; |
| } |
| |
| static void xfrm_statistics_fini(struct net *net) |
| { |
| xfrm_proc_fini(net); |
| snmp_mib_free((void __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 * 2; dir++) { |
| struct xfrm_policy_hash *htab; |
| |
| net->xfrm.policy_count[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; |
| } |
| |
| INIT_LIST_HEAD(&net->xfrm.policy_all); |
| INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); |
| if (net_eq(net, &init_net)) |
| register_netdevice_notifier(&xfrm_dev_notifier); |
| 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) |
| { |
| struct xfrm_audit audit_info; |
| unsigned int sz; |
| int dir; |
| |
| flush_work(&net->xfrm.policy_hash_work); |
| #ifdef CONFIG_XFRM_SUB_POLICY |
| audit_info.loginuid = -1; |
| audit_info.sessionid = -1; |
| audit_info.secid = 0; |
| xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info); |
| #endif |
| audit_info.loginuid = -1; |
| audit_info.sessionid = -1; |
| audit_info.secid = 0; |
| xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); |
| |
| WARN_ON(!list_empty(&net->xfrm.policy_all)); |
| |
| for (dir = 0; dir < XFRM_POLICY_MAX * 2; 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); |
| 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; |
| |
| 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; |
| xfrm_dst_ops_init(net); |
| 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_input_init(); |
| } |
| |
| #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, |
| uid_t auid, u32 sessionid, u32 secid) |
| { |
| struct audit_buffer *audit_buf; |
| |
| audit_buf = xfrm_audit_start("SPD-add"); |
| if (audit_buf == NULL) |
| return; |
| xfrm_audit_helper_usrinfo(auid, sessionid, secid, 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, |
| uid_t auid, u32 sessionid, u32 secid) |
| { |
| struct audit_buffer *audit_buf; |
| |
| audit_buf = xfrm_audit_start("SPD-delete"); |
| if (audit_buf == NULL) |
| return; |
| xfrm_audit_helper_usrinfo(auid, sessionid, secid, 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 int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, |
| struct xfrm_selector *sel_tgt) |
| { |
| if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { |
| if (sel_tgt->family == sel_cmp->family && |
| xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, |
| sel_cmp->family) == 0 && |
| xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
| sel_cmp->family) == 0 && |
| sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && |
| sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { |
| return 1; |
| } |
| } else { |
| if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { |
| return 1; |
| } |
| } |
| return 0; |
| } |
| |
| static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, |
| u8 dir, u8 type) |
| { |
| struct xfrm_policy *pol, *ret = NULL; |
| struct hlist_node *entry; |
| struct hlist_head *chain; |
| u32 priority = ~0U; |
| |
| read_lock_bh(&xfrm_policy_lock); |
| chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir); |
| hlist_for_each_entry(pol, entry, chain, bydst) { |
| if (xfrm_migrate_selector_match(sel, &pol->selector) && |
| pol->type == type) { |
| ret = pol; |
| priority = ret->priority; |
| break; |
| } |
| } |
| chain = &init_net.xfrm.policy_inexact[dir]; |
| hlist_for_each_entry(pol, entry, chain, bydst) { |
| if (xfrm_migrate_selector_match(sel, &pol->selector) && |
| pol->type == type && |
| pol->priority < priority) { |
| ret = pol; |
| break; |
| } |
| } |
| |
| if (ret) |
| xfrm_pol_hold(ret); |
| |
| read_unlock_bh(&xfrm_policy_lock); |
| |
| return ret; |
| } |
| |
| static int migrate_tmpl_match(struct xfrm_migrate *m, 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_cmp(&t->id.daddr, &m->old_daddr, |
| m->old_family) == 0 && |
| xfrm_addr_cmp(&t->saddr, &m->old_saddr, |
| m->old_family) == 0) { |
| 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(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_cmp(&m[i].old_daddr, &m[i].new_daddr, |
| m[i].old_family) == 0) && |
| (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, |
| m[i].old_family) == 0)) |
| return -EINVAL; |
| 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(struct xfrm_selector *sel, u8 dir, u8 type, |
| struct xfrm_migrate *m, int num_migrate, |
| struct xfrm_kmaddress *k) |
| { |
| 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; |
| |
| if ((err = xfrm_migrate_check(m, num_migrate)) < 0) |
| goto out; |
| |
| /* Stage 1 - find policy */ |
| if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == 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))) { |
| x_cur[nx_cur] = x; |
| nx_cur++; |
| if ((xc = xfrm_state_migrate(x, mp))) { |
| 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); |
| |
| xfrm_pol_put(pol); |
| |
| return 0; |
| out: |
|