![Florian Westphal](/assets/img/avatar_default.png)
if we succeed grabbing the refcount, then
if (err && !xfrm_pol_hold_rcu)
will evaluate to false so this hits last else branch which then
sets policy to ERR_PTR(0).
Fixes: ae33786f73
("xfrm: policy: only use rcu in xfrm_sk_policy_lookup")
Reported-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Tested-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
3414 lines
81 KiB
C
3414 lines
81 KiB
C
/*
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* xfrm_policy.c
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*
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* Changes:
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* Mitsuru KANDA @USAGI
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* Kazunori MIYAZAWA @USAGI
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* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
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* IPv6 support
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* Kazunori MIYAZAWA @USAGI
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* YOSHIFUJI Hideaki
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* Split up af-specific portion
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* Derek Atkins <derek@ihtfp.com> Add the post_input processor
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*
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*/
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/kmod.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/workqueue.h>
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#include <linux/notifier.h>
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#include <linux/netdevice.h>
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#include <linux/netfilter.h>
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#include <linux/module.h>
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#include <linux/cache.h>
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#include <linux/audit.h>
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#include <net/dst.h>
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#include <net/flow.h>
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#include <net/xfrm.h>
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#include <net/ip.h>
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#ifdef CONFIG_XFRM_STATISTICS
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#include <net/snmp.h>
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#endif
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#include "xfrm_hash.h"
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#define XFRM_QUEUE_TMO_MIN ((unsigned)(HZ/10))
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#define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ))
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#define XFRM_MAX_QUEUE_LEN 100
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struct xfrm_flo {
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struct dst_entry *dst_orig;
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u8 flags;
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};
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static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock);
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static struct xfrm_policy_afinfo __rcu *xfrm_policy_afinfo[NPROTO]
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__read_mostly;
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static struct kmem_cache *xfrm_dst_cache __read_mostly;
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static __read_mostly seqcount_t xfrm_policy_hash_generation;
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static void xfrm_init_pmtu(struct dst_entry *dst);
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static int stale_bundle(struct dst_entry *dst);
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static int xfrm_bundle_ok(struct xfrm_dst *xdst);
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static void xfrm_policy_queue_process(unsigned long arg);
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static void __xfrm_policy_link(struct xfrm_policy *pol, int dir);
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static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
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int dir);
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static inline bool xfrm_pol_hold_rcu(struct xfrm_policy *policy)
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{
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return atomic_inc_not_zero(&policy->refcnt);
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}
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static inline bool
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__xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
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{
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const struct flowi4 *fl4 = &fl->u.ip4;
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return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) &&
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addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) &&
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!((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) &&
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!((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) &&
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(fl4->flowi4_proto == sel->proto || !sel->proto) &&
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(fl4->flowi4_oif == sel->ifindex || !sel->ifindex);
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}
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static inline bool
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__xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
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{
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const struct flowi6 *fl6 = &fl->u.ip6;
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return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) &&
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addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) &&
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!((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) &&
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!((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) &&
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(fl6->flowi6_proto == sel->proto || !sel->proto) &&
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(fl6->flowi6_oif == sel->ifindex || !sel->ifindex);
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}
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bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl,
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unsigned short family)
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{
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switch (family) {
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case AF_INET:
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return __xfrm4_selector_match(sel, fl);
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case AF_INET6:
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return __xfrm6_selector_match(sel, fl);
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}
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return false;
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}
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static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
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{
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struct xfrm_policy_afinfo *afinfo;
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if (unlikely(family >= NPROTO))
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return NULL;
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rcu_read_lock();
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afinfo = rcu_dereference(xfrm_policy_afinfo[family]);
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if (unlikely(!afinfo))
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rcu_read_unlock();
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return afinfo;
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}
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static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
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{
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rcu_read_unlock();
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}
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static inline struct dst_entry *__xfrm_dst_lookup(struct net *net,
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int tos, int oif,
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const xfrm_address_t *saddr,
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const xfrm_address_t *daddr,
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int family)
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{
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struct xfrm_policy_afinfo *afinfo;
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struct dst_entry *dst;
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afinfo = xfrm_policy_get_afinfo(family);
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if (unlikely(afinfo == NULL))
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return ERR_PTR(-EAFNOSUPPORT);
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dst = afinfo->dst_lookup(net, tos, oif, saddr, daddr);
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xfrm_policy_put_afinfo(afinfo);
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return dst;
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}
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static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x,
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int tos, int oif,
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xfrm_address_t *prev_saddr,
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xfrm_address_t *prev_daddr,
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int family)
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{
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struct net *net = xs_net(x);
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xfrm_address_t *saddr = &x->props.saddr;
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xfrm_address_t *daddr = &x->id.daddr;
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struct dst_entry *dst;
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if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
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saddr = x->coaddr;
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daddr = prev_daddr;
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}
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if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
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saddr = prev_saddr;
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daddr = x->coaddr;
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}
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dst = __xfrm_dst_lookup(net, tos, oif, saddr, daddr, family);
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if (!IS_ERR(dst)) {
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if (prev_saddr != saddr)
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memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
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if (prev_daddr != daddr)
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memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
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}
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return dst;
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}
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static inline unsigned long make_jiffies(long secs)
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{
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if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
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return MAX_SCHEDULE_TIMEOUT-1;
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else
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return secs*HZ;
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}
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static void xfrm_policy_timer(unsigned long data)
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{
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struct xfrm_policy *xp = (struct xfrm_policy *)data;
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unsigned long now = get_seconds();
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long next = LONG_MAX;
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int warn = 0;
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int dir;
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read_lock(&xp->lock);
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if (unlikely(xp->walk.dead))
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goto out;
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dir = xfrm_policy_id2dir(xp->index);
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if (xp->lft.hard_add_expires_seconds) {
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long tmo = xp->lft.hard_add_expires_seconds +
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xp->curlft.add_time - now;
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if (tmo <= 0)
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goto expired;
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if (tmo < next)
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next = tmo;
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}
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if (xp->lft.hard_use_expires_seconds) {
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long tmo = xp->lft.hard_use_expires_seconds +
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(xp->curlft.use_time ? : xp->curlft.add_time) - now;
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if (tmo <= 0)
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goto expired;
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if (tmo < next)
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next = tmo;
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}
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if (xp->lft.soft_add_expires_seconds) {
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long tmo = xp->lft.soft_add_expires_seconds +
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xp->curlft.add_time - now;
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if (tmo <= 0) {
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warn = 1;
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tmo = XFRM_KM_TIMEOUT;
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}
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if (tmo < next)
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next = tmo;
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}
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if (xp->lft.soft_use_expires_seconds) {
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long tmo = xp->lft.soft_use_expires_seconds +
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(xp->curlft.use_time ? : xp->curlft.add_time) - now;
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if (tmo <= 0) {
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warn = 1;
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tmo = XFRM_KM_TIMEOUT;
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}
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if (tmo < next)
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next = tmo;
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}
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if (warn)
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km_policy_expired(xp, dir, 0, 0);
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if (next != LONG_MAX &&
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!mod_timer(&xp->timer, jiffies + make_jiffies(next)))
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xfrm_pol_hold(xp);
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out:
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read_unlock(&xp->lock);
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xfrm_pol_put(xp);
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return;
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expired:
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read_unlock(&xp->lock);
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if (!xfrm_policy_delete(xp, dir))
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km_policy_expired(xp, dir, 1, 0);
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xfrm_pol_put(xp);
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}
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static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
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{
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struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
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if (unlikely(pol->walk.dead))
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flo = NULL;
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else
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xfrm_pol_hold(pol);
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return flo;
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}
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static int xfrm_policy_flo_check(struct flow_cache_object *flo)
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{
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struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
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return !pol->walk.dead;
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}
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static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
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{
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xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
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}
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static const struct flow_cache_ops xfrm_policy_fc_ops = {
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.get = xfrm_policy_flo_get,
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.check = xfrm_policy_flo_check,
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.delete = xfrm_policy_flo_delete,
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};
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/* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
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* SPD calls.
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*/
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struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
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{
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struct xfrm_policy *policy;
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policy = kzalloc(sizeof(struct xfrm_policy), gfp);
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if (policy) {
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write_pnet(&policy->xp_net, net);
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INIT_LIST_HEAD(&policy->walk.all);
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INIT_HLIST_NODE(&policy->bydst);
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INIT_HLIST_NODE(&policy->byidx);
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rwlock_init(&policy->lock);
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atomic_set(&policy->refcnt, 1);
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skb_queue_head_init(&policy->polq.hold_queue);
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setup_timer(&policy->timer, xfrm_policy_timer,
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(unsigned long)policy);
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setup_timer(&policy->polq.hold_timer, xfrm_policy_queue_process,
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(unsigned long)policy);
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policy->flo.ops = &xfrm_policy_fc_ops;
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}
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return policy;
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}
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EXPORT_SYMBOL(xfrm_policy_alloc);
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static void xfrm_policy_destroy_rcu(struct rcu_head *head)
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{
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struct xfrm_policy *policy = container_of(head, struct xfrm_policy, rcu);
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security_xfrm_policy_free(policy->security);
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kfree(policy);
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}
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/* Destroy xfrm_policy: descendant resources must be released to this moment. */
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void xfrm_policy_destroy(struct xfrm_policy *policy)
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{
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BUG_ON(!policy->walk.dead);
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if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer))
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BUG();
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call_rcu(&policy->rcu, xfrm_policy_destroy_rcu);
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}
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EXPORT_SYMBOL(xfrm_policy_destroy);
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/* Rule must be locked. Release descentant resources, announce
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* entry dead. The rule must be unlinked from lists to the moment.
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*/
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static void xfrm_policy_kill(struct xfrm_policy *policy)
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{
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policy->walk.dead = 1;
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atomic_inc(&policy->genid);
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if (del_timer(&policy->polq.hold_timer))
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xfrm_pol_put(policy);
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skb_queue_purge(&policy->polq.hold_queue);
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if (del_timer(&policy->timer))
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xfrm_pol_put(policy);
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xfrm_pol_put(policy);
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}
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static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
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static inline unsigned int idx_hash(struct net *net, u32 index)
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{
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return __idx_hash(index, net->xfrm.policy_idx_hmask);
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}
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/* calculate policy hash thresholds */
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static void __get_hash_thresh(struct net *net,
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unsigned short family, int dir,
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u8 *dbits, u8 *sbits)
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{
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switch (family) {
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case AF_INET:
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*dbits = net->xfrm.policy_bydst[dir].dbits4;
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*sbits = net->xfrm.policy_bydst[dir].sbits4;
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break;
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case AF_INET6:
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*dbits = net->xfrm.policy_bydst[dir].dbits6;
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*sbits = net->xfrm.policy_bydst[dir].sbits6;
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break;
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default:
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*dbits = 0;
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*sbits = 0;
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}
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}
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static struct hlist_head *policy_hash_bysel(struct net *net,
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const struct xfrm_selector *sel,
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unsigned short family, int dir)
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{
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unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
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unsigned int hash;
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u8 dbits;
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u8 sbits;
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__get_hash_thresh(net, family, dir, &dbits, &sbits);
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hash = __sel_hash(sel, family, hmask, dbits, sbits);
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if (hash == hmask + 1)
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return &net->xfrm.policy_inexact[dir];
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return rcu_dereference_check(net->xfrm.policy_bydst[dir].table,
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lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash;
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}
|
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|
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static struct hlist_head *policy_hash_direct(struct net *net,
|
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const xfrm_address_t *daddr,
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const xfrm_address_t *saddr,
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unsigned short family, int dir)
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{
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unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
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unsigned int hash;
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u8 dbits;
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u8 sbits;
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|
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__get_hash_thresh(net, family, dir, &dbits, &sbits);
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hash = __addr_hash(daddr, saddr, family, hmask, dbits, sbits);
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return rcu_dereference_check(net->xfrm.policy_bydst[dir].table,
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lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash;
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}
|
|
|
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static void xfrm_dst_hash_transfer(struct net *net,
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struct hlist_head *list,
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struct hlist_head *ndsttable,
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unsigned int nhashmask,
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int dir)
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{
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struct hlist_node *tmp, *entry0 = NULL;
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struct xfrm_policy *pol;
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unsigned int h0 = 0;
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u8 dbits;
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u8 sbits;
|
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|
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redo:
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hlist_for_each_entry_safe(pol, tmp, list, bydst) {
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unsigned int h;
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|
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__get_hash_thresh(net, pol->family, dir, &dbits, &sbits);
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h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
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pol->family, nhashmask, dbits, sbits);
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if (!entry0) {
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hlist_del_rcu(&pol->bydst);
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hlist_add_head_rcu(&pol->bydst, ndsttable + h);
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h0 = h;
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} else {
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if (h != h0)
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continue;
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hlist_del_rcu(&pol->bydst);
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hlist_add_behind_rcu(&pol->bydst, entry0);
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}
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entry0 = &pol->bydst;
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}
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if (!hlist_empty(list)) {
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entry0 = NULL;
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goto redo;
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}
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}
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|
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static void xfrm_idx_hash_transfer(struct hlist_head *list,
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struct hlist_head *nidxtable,
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unsigned int nhashmask)
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{
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struct hlist_node *tmp;
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struct xfrm_policy *pol;
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hlist_for_each_entry_safe(pol, tmp, list, byidx) {
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unsigned int h;
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h = __idx_hash(pol->index, nhashmask);
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hlist_add_head(&pol->byidx, nidxtable+h);
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}
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}
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|
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static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
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{
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return ((old_hmask + 1) << 1) - 1;
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}
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|
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static void xfrm_bydst_resize(struct net *net, int dir)
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{
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unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
|
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unsigned int nhashmask = xfrm_new_hash_mask(hmask);
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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 (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(&policy->bydst, newpos);
|
|
else
|
|
hlist_add_head(&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 bool xfrm_policy_mark_match(struct xfrm_policy *policy,
|
|
struct xfrm_policy *pol)
|
|
{
|
|
u32 mark = policy->mark.v & policy->mark.m;
|
|
|
|
if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m)
|
|
return true;
|
|
|
|
if ((mark & pol->mark.m) == pol->mark.v &&
|
|
policy->priority == pol->priority)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
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 &&
|
|
!selector_cmp(&pol->selector, &policy->selector) &&
|
|
xfrm_policy_mark_match(policy, 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(&policy->bydst, newpos);
|
|
else
|
|
hlist_add_head(&policy->bydst, chain);
|
|
__xfrm_policy_link(policy, dir);
|
|
atomic_inc(&net->xfrm.flow_cache_genid);
|
|
|
|
/* 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 = get_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, 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;
|
|
|
|
*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 &&
|
|
(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) {
|
|
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, u32 mark, 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 &&
|
|
(mark & pol->mark.m) == pol->mark.v) {
|
|
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)
|
|
{
|
|
const struct xfrm_selector *sel = &pol->selector;
|
|
int ret = -ESRCH;
|
|
bool match;
|
|
|
|
if (pol->family != family ||
|
|
(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)
|
|
{
|
|
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 (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 (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)
|
|
{
|
|
#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 int flow_to_policy_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 FLOW_DIR_IN:
|
|
return XFRM_POLICY_IN;
|
|
case FLOW_DIR_OUT:
|
|
return XFRM_POLICY_OUT;
|
|
case FLOW_DIR_FWD:
|
|
return XFRM_POLICY_FWD;
|
|
}
|
|
}
|
|
|
|
static struct flow_cache_object *
|
|
xfrm_policy_lookup(struct net *net, const 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, flow_to_policy_dir(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(const struct sock *sk, int dir,
|
|
const struct flowi *fl)
|
|
{
|
|
struct xfrm_policy *pol;
|
|
|
|
rcu_read_lock();
|
|
again:
|
|
pol = rcu_dereference(sk->sk_policy[dir]);
|
|
if (pol != NULL) {
|
|
bool 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->flowi_secid,
|
|
policy_to_flow_dir(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 = xp_net(pol);
|
|
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 = get_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->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));
|
|
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)
|
|
{
|
|
int err;
|
|
struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
|
|
|
|
if (unlikely(afinfo == NULL))
|
|
return -EINVAL;
|
|
err = afinfo->get_saddr(net, oif, 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, 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);
|
|
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, 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;
|
|
|
|
}
|
|
|
|
/* Check that the bundle accepts the flow and its components are
|
|
* still valid.
|
|
*/
|
|
|
|
static inline int xfrm_get_tos(const 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 if (dst->flags & DST_XFRM_QUEUE) {
|
|
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 IS_ENABLED(CONFIG_IPV6)
|
|
case AF_INET6:
|
|
dst_ops = &net->xfrm.xfrm6_dst_ops;
|
|
break;
|
|
#endif
|
|
default:
|
|
BUG();
|
|
}
|
|
xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0);
|
|
|
|
if (likely(xdst)) {
|
|
struct dst_entry *dst = &xdst->u.dst;
|
|
|
|
memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst));
|
|
xdst->flo.ops = &xfrm_bundle_fc_ops;
|
|
} else
|
|
xdst = ERR_PTR(-ENOBUFS);
|
|
|
|
xfrm_policy_put_afinfo(afinfo);
|
|
|
|
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,
|
|
const 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,
|
|
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 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 (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;
|
|
|
|
if (!dst_prev)
|
|
dst0 = dst1;
|
|
else {
|
|
dst_prev->child = dst_clone(dst1);
|
|
dst1->flags |= DST_NOHASH;
|
|
}
|
|
|
|
xdst->route = dst;
|
|
dst_copy_metrics(dst1, dst);
|
|
|
|
if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
|
|
family = xfrm[i]->props.family;
|
|
dst = xfrm_dst_lookup(xfrm[i], tos, fl->flowi_oif,
|
|
&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 = DST_OBSOLETE_FORCE_CHK;
|
|
dst1->flags |= DST_HOST;
|
|
dst1->lastuse = now;
|
|
|
|
dst1->input = dst_discard;
|
|
dst1->output = inner_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;
|
|
|
|
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;
|
|
}
|
|
|
|
#ifdef CONFIG_XFRM_SUB_POLICY
|
|
static int xfrm_dst_alloc_copy(void **target, const void *src, int size)
|
|
{
|
|
if (!*target) {
|
|
*target = kmalloc(size, GFP_ATOMIC);
|
|
if (!*target)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
memcpy(*target, src, size);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int xfrm_dst_update_parent(struct dst_entry *dst,
|
|
const 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 xfrm_dst_update_origin(struct dst_entry *dst,
|
|
const 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(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);
|
|
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 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 void xfrm_policy_queue_process(unsigned long arg)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct sock *sk;
|
|
struct dst_entry *dst;
|
|
struct xfrm_policy *pol = (struct xfrm_policy *)arg;
|
|
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(dst->path);
|
|
dst = xfrm_lookup(net, dst->path, &fl, sk, 0);
|
|
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(skb_dst(skb)->path);
|
|
dst = xfrm_lookup(net, skb_dst(skb)->path, &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);
|
|
dst1->child = dst;
|
|
dst1->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 flow_cache_object *
|
|
xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
|
|
struct flow_cache_object *oldflo, void *ctx)
|
|
{
|
|
struct xfrm_flo *xflo = (struct xfrm_flo *)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,
|
|
flow_to_policy_dir(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,
|
|
xflo->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_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);
|
|
|
|
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);
|
|
}
|
|
|
|
static struct dst_entry *make_blackhole(struct net *net, u16 family,
|
|
struct dst_entry *dst_orig)
|
|
{
|
|
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);
|
|
}
|
|
xfrm_policy_put_afinfo(afinfo);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
|
|
struct flow_cache_object *flo;
|
|
struct xfrm_dst *xdst;
|
|
struct dst_entry *dst, *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;
|
|
|
|
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);
|
|
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;
|
|
}
|
|
|
|
dst_hold(&xdst->u.dst);
|
|
xdst->u.dst.flags |= DST_NOCACHE;
|
|
route = xdst->route;
|
|
}
|
|
}
|
|
|
|
if (xdst == NULL) {
|
|
struct xfrm_flo xflo;
|
|
|
|
xflo.dst_orig = dst_orig;
|
|
xflo.flags = flags;
|
|
|
|
/* 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, &xflo);
|
|
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) {
|
|
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 = 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_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);
|
|
|
|
/* 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);
|
|
|
|
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)
|
|
{
|
|
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);
|
|
xfrm_policy_put_afinfo(afinfo);
|
|
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;
|
|
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;
|
|
sk = sk_to_full_sk(sk);
|
|
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, 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);
|
|
|
|
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 policy's bundle is pruned, we dst_free() the XFRM
|
|
* dst which causes it's ->obsolete field to be set to
|
|
* DST_OBSOLETE_DEAD. 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((struct xfrm_dst *)dst);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
void xfrm_garbage_collect(struct net *net)
|
|
{
|
|
flow_cache_flush(net);
|
|
}
|
|
EXPORT_SYMBOL(xfrm_garbage_collect);
|
|
|
|
static void xfrm_garbage_collect_deferred(struct net *net)
|
|
{
|
|
flow_cache_flush_deferred(net);
|
|
}
|
|
|
|
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_metric_set(dst, RTAX_MTU, pmtu);
|
|
} while ((dst = dst->next));
|
|
}
|
|
|
|
/* Check that the bundle accepts the flow and its components are
|
|
* still valid.
|
|
*/
|
|
|
|
static int xfrm_bundle_ok(struct xfrm_dst *first)
|
|
{
|
|
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;
|
|
|
|
if (dst->flags & DST_XFRM_QUEUE)
|
|
return 1;
|
|
|
|
last = NULL;
|
|
|
|
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;
|
|
|
|
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_metric_set(dst, RTAX_MTU, mtu);
|
|
|
|
if (last == first)
|
|
break;
|
|
|
|
last = (struct xfrm_dst *)last->u.dst.next;
|
|
last->child_mtu_cached = mtu;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
|
|
{
|
|
return dst_metric_advmss(dst->path);
|
|
}
|
|
|
|
static unsigned int xfrm_mtu(const struct dst_entry *dst)
|
|
{
|
|
unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
|
|
|
|
return mtu ? : dst_mtu(dst->path);
|
|
}
|
|
|
|
static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
|
|
struct sk_buff *skb,
|
|
const void *daddr)
|
|
{
|
|
return dst->path->ops->neigh_lookup(dst, skb, daddr);
|
|
}
|
|
|
|
int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
|
|
{
|
|
int err = 0;
|
|
if (unlikely(afinfo == NULL))
|
|
return -EINVAL;
|
|
if (unlikely(afinfo->family >= NPROTO))
|
|
return -EAFNOSUPPORT;
|
|
spin_lock(&xfrm_policy_afinfo_lock);
|
|
if (unlikely(xfrm_policy_afinfo[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(afinfo->garbage_collect == NULL))
|
|
afinfo->garbage_collect = xfrm_garbage_collect_deferred;
|
|
rcu_assign_pointer(xfrm_policy_afinfo[afinfo->family], afinfo);
|
|
}
|
|
spin_unlock(&xfrm_policy_afinfo_lock);
|
|
|
|
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;
|
|
spin_lock(&xfrm_policy_afinfo_lock);
|
|
if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
|
|
if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
|
|
err = -EINVAL;
|
|
else
|
|
RCU_INIT_POINTER(xfrm_policy_afinfo[afinfo->family],
|
|
NULL);
|
|
}
|
|
spin_unlock(&xfrm_policy_afinfo_lock);
|
|
if (!err) {
|
|
struct dst_ops *dst_ops = afinfo->dst_ops;
|
|
|
|
synchronize_rcu();
|
|
|
|
dst_ops->kmem_cachep = NULL;
|
|
dst_ops->check = NULL;
|
|
dst_ops->negative_advice = NULL;
|
|
dst_ops->link_failure = NULL;
|
|
afinfo->garbage_collect = NULL;
|
|
}
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
|
|
|
|
static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_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;
|
|
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);
|
|
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)
|
|
{
|
|
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;
|
|
|
|
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;
|
|
rv = flow_cache_init(net);
|
|
if (rv < 0)
|
|
goto out;
|
|
|
|
/* 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);
|
|
|
|
return 0;
|
|
|
|
out:
|
|
xfrm_sysctl_fini(net);
|
|
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)
|
|
{
|
|
flow_cache_fini(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);
|
|
seqcount_init(&xfrm_policy_hash_generation);
|
|
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, 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)
|
|
{
|
|
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 (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 (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_equal(&m[i].old_daddr, &m[i].new_daddr,
|
|
m[i].old_family) &&
|
|
xfrm_addr_equal(&m[i].old_saddr, &m[i].new_saddr,
|
|
m[i].old_family))
|
|
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(const struct xfrm_selector *sel, u8 dir, u8 type,
|
|
struct xfrm_migrate *m, int num_migrate,
|
|
struct xfrm_kmaddress *k, struct net *net)
|
|
{
|
|
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, net)) == 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))) {
|
|
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:
|
|
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
|