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![Leon Romanovsky](/assets/img/avatar_default.png)
Offloaded policies are deleted through two flows: netdev is going
down and policy flush.
In both cases, the code lacks relevant call to delete offloaded policy.
Fixes: 919e43fad5
("xfrm: add an interface to offload policy")
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
4579 lines
109 KiB
C
4579 lines
109 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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/cpu.h>
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#include <linux/audit.h>
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#include <linux/rhashtable.h>
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#include <linux/if_tunnel.h>
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#include <net/dst.h>
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#include <net/flow.h>
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#include <net/inet_ecn.h>
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#include <net/xfrm.h>
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#include <net/ip.h>
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#include <net/gre.h>
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#if IS_ENABLED(CONFIG_IPV6_MIP6)
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#include <net/mip6.h>
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#endif
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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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#ifdef CONFIG_XFRM_ESPINTCP
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#include <net/espintcp.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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/* prefixes smaller than this are stored in lists, not trees. */
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#define INEXACT_PREFIXLEN_IPV4 16
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#define INEXACT_PREFIXLEN_IPV6 48
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struct xfrm_pol_inexact_node {
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struct rb_node node;
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union {
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xfrm_address_t addr;
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struct rcu_head rcu;
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};
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u8 prefixlen;
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struct rb_root root;
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/* the policies matching this node, can be empty list */
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struct hlist_head hhead;
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};
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/* xfrm inexact policy search tree:
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* xfrm_pol_inexact_bin = hash(dir,type,family,if_id);
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* |
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* +---- root_d: sorted by daddr:prefix
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* | |
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* | xfrm_pol_inexact_node
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* | |
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* | +- root: sorted by saddr/prefix
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* | | |
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* | | xfrm_pol_inexact_node
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* | | |
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* | | + root: unused
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* | | |
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* | | + hhead: saddr:daddr policies
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* | |
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* | +- coarse policies and all any:daddr policies
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* |
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* +---- root_s: sorted by saddr:prefix
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* | |
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* | xfrm_pol_inexact_node
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* | |
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* | + root: unused
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* | |
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* | + hhead: saddr:any policies
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* |
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* +---- coarse policies and all any:any policies
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*
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* Lookups return four candidate lists:
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* 1. any:any list from top-level xfrm_pol_inexact_bin
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* 2. any:daddr list from daddr tree
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* 3. saddr:daddr list from 2nd level daddr tree
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* 4. saddr:any list from saddr tree
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*
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* This result set then needs to be searched for the policy with
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* the lowest priority. If two results have same prio, youngest one wins.
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*/
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struct xfrm_pol_inexact_key {
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possible_net_t net;
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u32 if_id;
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u16 family;
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u8 dir, type;
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};
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struct xfrm_pol_inexact_bin {
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struct xfrm_pol_inexact_key k;
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struct rhash_head head;
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/* list containing '*:*' policies */
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struct hlist_head hhead;
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seqcount_spinlock_t count;
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/* tree sorted by daddr/prefix */
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struct rb_root root_d;
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/* tree sorted by saddr/prefix */
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struct rb_root root_s;
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/* slow path below */
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struct list_head inexact_bins;
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struct rcu_head rcu;
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};
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enum xfrm_pol_inexact_candidate_type {
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XFRM_POL_CAND_BOTH,
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XFRM_POL_CAND_SADDR,
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XFRM_POL_CAND_DADDR,
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XFRM_POL_CAND_ANY,
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XFRM_POL_CAND_MAX,
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};
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struct xfrm_pol_inexact_candidates {
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struct hlist_head *res[XFRM_POL_CAND_MAX];
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};
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static DEFINE_SPINLOCK(xfrm_if_cb_lock);
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static struct xfrm_if_cb const __rcu *xfrm_if_cb __read_mostly;
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static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock);
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static struct xfrm_policy_afinfo const __rcu *xfrm_policy_afinfo[AF_INET6 + 1]
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__read_mostly;
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static struct kmem_cache *xfrm_dst_cache __ro_after_init;
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static struct rhashtable xfrm_policy_inexact_table;
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static const struct rhashtable_params xfrm_pol_inexact_params;
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static void xfrm_init_pmtu(struct xfrm_dst **bundle, int nr);
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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(struct timer_list *t);
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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 struct xfrm_pol_inexact_bin *
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xfrm_policy_inexact_lookup(struct net *net, u8 type, u16 family, u8 dir,
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u32 if_id);
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static struct xfrm_pol_inexact_bin *
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xfrm_policy_inexact_lookup_rcu(struct net *net,
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u8 type, u16 family, u8 dir, u32 if_id);
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static struct xfrm_policy *
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xfrm_policy_insert_list(struct hlist_head *chain, struct xfrm_policy *policy,
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bool excl);
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static void xfrm_policy_insert_inexact_list(struct hlist_head *chain,
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struct xfrm_policy *policy);
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static bool
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xfrm_policy_find_inexact_candidates(struct xfrm_pol_inexact_candidates *cand,
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struct xfrm_pol_inexact_bin *b,
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const xfrm_address_t *saddr,
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const xfrm_address_t *daddr);
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static inline bool xfrm_pol_hold_rcu(struct xfrm_policy *policy)
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{
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return refcount_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 const struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
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{
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const struct xfrm_policy_afinfo *afinfo;
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if (unlikely(family >= ARRAY_SIZE(xfrm_policy_afinfo)))
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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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/* Called with rcu_read_lock(). */
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static const struct xfrm_if_cb *xfrm_if_get_cb(void)
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{
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return rcu_dereference(xfrm_if_cb);
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}
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struct dst_entry *__xfrm_dst_lookup(struct net *net, 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, u32 mark)
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{
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const 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, mark);
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rcu_read_unlock();
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return dst;
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}
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EXPORT_SYMBOL(__xfrm_dst_lookup);
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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, u32 mark)
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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, mark);
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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(struct timer_list *t)
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{
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struct xfrm_policy *xp = from_timer(xp, t, timer);
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time64_t now = ktime_get_real_seconds();
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time64_t next = TIME64_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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time64_t 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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time64_t tmo = xp->lft.hard_use_expires_seconds +
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(READ_ONCE(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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time64_t 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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time64_t tmo = xp->lft.soft_use_expires_seconds +
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(READ_ONCE(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 != TIME64_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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/* 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_inexact_list);
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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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refcount_set(&policy->refcnt, 1);
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skb_queue_head_init(&policy->polq.hold_queue);
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timer_setup(&policy->timer, xfrm_policy_timer, 0);
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timer_setup(&policy->polq.hold_timer,
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xfrm_policy_queue_process, 0);
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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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|
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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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|
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security_xfrm_policy_free(policy->security);
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kfree(policy);
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}
|
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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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|
|
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if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer))
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BUG();
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|
|
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xfrm_dev_policy_free(policy);
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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 descendant 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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write_lock_bh(&policy->lock);
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policy->walk.dead = 1;
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write_unlock_bh(&policy->lock);
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|
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atomic_inc(&policy->genid);
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|
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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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|
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if (del_timer(&policy->timer))
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xfrm_pol_put(policy);
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|
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xfrm_pol_put(policy);
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}
|
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|
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static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
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|
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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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}
|
|
|
|
/* 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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switch (family) {
|
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case AF_INET:
|
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*dbits = net->xfrm.policy_bydst[dir].dbits4;
|
|
*sbits = net->xfrm.policy_bydst[dir].sbits4;
|
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break;
|
|
|
|
case AF_INET6:
|
|
*dbits = net->xfrm.policy_bydst[dir].dbits6;
|
|
*sbits = net->xfrm.policy_bydst[dir].sbits6;
|
|
break;
|
|
|
|
default:
|
|
*dbits = 0;
|
|
*sbits = 0;
|
|
}
|
|
}
|
|
|
|
static struct hlist_head *policy_hash_bysel(struct net *net,
|
|
const struct xfrm_selector *sel,
|
|
unsigned short family, int dir)
|
|
{
|
|
unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
|
|
unsigned int hash;
|
|
u8 dbits;
|
|
u8 sbits;
|
|
|
|
__get_hash_thresh(net, family, dir, &dbits, &sbits);
|
|
hash = __sel_hash(sel, family, hmask, dbits, sbits);
|
|
|
|
if (hash == hmask + 1)
|
|
return NULL;
|
|
|
|
return rcu_dereference_check(net->xfrm.policy_bydst[dir].table,
|
|
lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash;
|
|
}
|
|
|
|
static struct hlist_head *policy_hash_direct(struct net *net,
|
|
const xfrm_address_t *daddr,
|
|
const xfrm_address_t *saddr,
|
|
unsigned short family, int dir)
|
|
{
|
|
unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
|
|
unsigned int hash;
|
|
u8 dbits;
|
|
u8 sbits;
|
|
|
|
__get_hash_thresh(net, family, dir, &dbits, &sbits);
|
|
hash = __addr_hash(daddr, saddr, family, hmask, dbits, sbits);
|
|
|
|
return rcu_dereference_check(net->xfrm.policy_bydst[dir].table,
|
|
lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash;
|
|
}
|
|
|
|
static void xfrm_dst_hash_transfer(struct net *net,
|
|
struct hlist_head *list,
|
|
struct hlist_head *ndsttable,
|
|
unsigned int nhashmask,
|
|
int dir)
|
|
{
|
|
struct hlist_node *tmp, *entry0 = NULL;
|
|
struct xfrm_policy *pol;
|
|
unsigned int h0 = 0;
|
|
u8 dbits;
|
|
u8 sbits;
|
|
|
|
redo:
|
|
hlist_for_each_entry_safe(pol, tmp, list, bydst) {
|
|
unsigned int h;
|
|
|
|
__get_hash_thresh(net, pol->family, dir, &dbits, &sbits);
|
|
h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
|
|
pol->family, nhashmask, dbits, sbits);
|
|
if (!entry0 || pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) {
|
|
hlist_del_rcu(&pol->bydst);
|
|
hlist_add_head_rcu(&pol->bydst, ndsttable + h);
|
|
h0 = h;
|
|
} else {
|
|
if (h != h0)
|
|
continue;
|
|
hlist_del_rcu(&pol->bydst);
|
|
hlist_add_behind_rcu(&pol->bydst, entry0);
|
|
}
|
|
entry0 = &pol->bydst;
|
|
}
|
|
if (!hlist_empty(list)) {
|
|
entry0 = NULL;
|
|
goto redo;
|
|
}
|
|
}
|
|
|
|
static void xfrm_idx_hash_transfer(struct hlist_head *list,
|
|
struct hlist_head *nidxtable,
|
|
unsigned int nhashmask)
|
|
{
|
|
struct hlist_node *tmp;
|
|
struct xfrm_policy *pol;
|
|
|
|
hlist_for_each_entry_safe(pol, tmp, list, byidx) {
|
|
unsigned int h;
|
|
|
|
h = __idx_hash(pol->index, nhashmask);
|
|
hlist_add_head(&pol->byidx, nidxtable+h);
|
|
}
|
|
}
|
|
|
|
static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
|
|
{
|
|
return ((old_hmask + 1) << 1) - 1;
|
|
}
|
|
|
|
static void xfrm_bydst_resize(struct net *net, int dir)
|
|
{
|
|
unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
|
|
unsigned int nhashmask = xfrm_new_hash_mask(hmask);
|
|
unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
|
|
struct hlist_head *ndst = xfrm_hash_alloc(nsize);
|
|
struct hlist_head *odst;
|
|
int i;
|
|
|
|
if (!ndst)
|
|
return;
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_policy_lock);
|
|
write_seqcount_begin(&net->xfrm.xfrm_policy_hash_generation);
|
|
|
|
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(&net->xfrm.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)
|
|
{
|
|
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);
|
|
|
|
mutex_unlock(&hash_resize_mutex);
|
|
}
|
|
|
|
/* Make sure *pol can be inserted into fastbin.
|
|
* Useful to check that later insert requests will be successful
|
|
* (provided xfrm_policy_lock is held throughout).
|
|
*/
|
|
static struct xfrm_pol_inexact_bin *
|
|
xfrm_policy_inexact_alloc_bin(const struct xfrm_policy *pol, u8 dir)
|
|
{
|
|
struct xfrm_pol_inexact_bin *bin, *prev;
|
|
struct xfrm_pol_inexact_key k = {
|
|
.family = pol->family,
|
|
.type = pol->type,
|
|
.dir = dir,
|
|
.if_id = pol->if_id,
|
|
};
|
|
struct net *net = xp_net(pol);
|
|
|
|
lockdep_assert_held(&net->xfrm.xfrm_policy_lock);
|
|
|
|
write_pnet(&k.net, net);
|
|
bin = rhashtable_lookup_fast(&xfrm_policy_inexact_table, &k,
|
|
xfrm_pol_inexact_params);
|
|
if (bin)
|
|
return bin;
|
|
|
|
bin = kzalloc(sizeof(*bin), GFP_ATOMIC);
|
|
if (!bin)
|
|
return NULL;
|
|
|
|
bin->k = k;
|
|
INIT_HLIST_HEAD(&bin->hhead);
|
|
bin->root_d = RB_ROOT;
|
|
bin->root_s = RB_ROOT;
|
|
seqcount_spinlock_init(&bin->count, &net->xfrm.xfrm_policy_lock);
|
|
|
|
prev = rhashtable_lookup_get_insert_key(&xfrm_policy_inexact_table,
|
|
&bin->k, &bin->head,
|
|
xfrm_pol_inexact_params);
|
|
if (!prev) {
|
|
list_add(&bin->inexact_bins, &net->xfrm.inexact_bins);
|
|
return bin;
|
|
}
|
|
|
|
kfree(bin);
|
|
|
|
return IS_ERR(prev) ? NULL : prev;
|
|
}
|
|
|
|
static bool xfrm_pol_inexact_addr_use_any_list(const xfrm_address_t *addr,
|
|
int family, u8 prefixlen)
|
|
{
|
|
if (xfrm_addr_any(addr, family))
|
|
return true;
|
|
|
|
if (family == AF_INET6 && prefixlen < INEXACT_PREFIXLEN_IPV6)
|
|
return true;
|
|
|
|
if (family == AF_INET && prefixlen < INEXACT_PREFIXLEN_IPV4)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool
|
|
xfrm_policy_inexact_insert_use_any_list(const struct xfrm_policy *policy)
|
|
{
|
|
const xfrm_address_t *addr;
|
|
bool saddr_any, daddr_any;
|
|
u8 prefixlen;
|
|
|
|
addr = &policy->selector.saddr;
|
|
prefixlen = policy->selector.prefixlen_s;
|
|
|
|
saddr_any = xfrm_pol_inexact_addr_use_any_list(addr,
|
|
policy->family,
|
|
prefixlen);
|
|
addr = &policy->selector.daddr;
|
|
prefixlen = policy->selector.prefixlen_d;
|
|
daddr_any = xfrm_pol_inexact_addr_use_any_list(addr,
|
|
policy->family,
|
|
prefixlen);
|
|
return saddr_any && daddr_any;
|
|
}
|
|
|
|
static void xfrm_pol_inexact_node_init(struct xfrm_pol_inexact_node *node,
|
|
const xfrm_address_t *addr, u8 prefixlen)
|
|
{
|
|
node->addr = *addr;
|
|
node->prefixlen = prefixlen;
|
|
}
|
|
|
|
static struct xfrm_pol_inexact_node *
|
|
xfrm_pol_inexact_node_alloc(const xfrm_address_t *addr, u8 prefixlen)
|
|
{
|
|
struct xfrm_pol_inexact_node *node;
|
|
|
|
node = kzalloc(sizeof(*node), GFP_ATOMIC);
|
|
if (node)
|
|
xfrm_pol_inexact_node_init(node, addr, prefixlen);
|
|
|
|
return node;
|
|
}
|
|
|
|
static int xfrm_policy_addr_delta(const xfrm_address_t *a,
|
|
const xfrm_address_t *b,
|
|
u8 prefixlen, u16 family)
|
|
{
|
|
u32 ma, mb, mask;
|
|
unsigned int pdw, pbi;
|
|
int delta = 0;
|
|
|
|
switch (family) {
|
|
case AF_INET:
|
|
if (prefixlen == 0)
|
|
return 0;
|
|
mask = ~0U << (32 - prefixlen);
|
|
ma = ntohl(a->a4) & mask;
|
|
mb = ntohl(b->a4) & mask;
|
|
if (ma < mb)
|
|
delta = -1;
|
|
else if (ma > mb)
|
|
delta = 1;
|
|
break;
|
|
case AF_INET6:
|
|
pdw = prefixlen >> 5;
|
|
pbi = prefixlen & 0x1f;
|
|
|
|
if (pdw) {
|
|
delta = memcmp(a->a6, b->a6, pdw << 2);
|
|
if (delta)
|
|
return delta;
|
|
}
|
|
if (pbi) {
|
|
mask = ~0U << (32 - pbi);
|
|
ma = ntohl(a->a6[pdw]) & mask;
|
|
mb = ntohl(b->a6[pdw]) & mask;
|
|
if (ma < mb)
|
|
delta = -1;
|
|
else if (ma > mb)
|
|
delta = 1;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return delta;
|
|
}
|
|
|
|
static void xfrm_policy_inexact_list_reinsert(struct net *net,
|
|
struct xfrm_pol_inexact_node *n,
|
|
u16 family)
|
|
{
|
|
unsigned int matched_s, matched_d;
|
|
struct xfrm_policy *policy, *p;
|
|
|
|
matched_s = 0;
|
|
matched_d = 0;
|
|
|
|
list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) {
|
|
struct hlist_node *newpos = NULL;
|
|
bool matches_s, matches_d;
|
|
|
|
if (!policy->bydst_reinsert)
|
|
continue;
|
|
|
|
WARN_ON_ONCE(policy->family != family);
|
|
|
|
policy->bydst_reinsert = false;
|
|
hlist_for_each_entry(p, &n->hhead, bydst) {
|
|
if (policy->priority > p->priority)
|
|
newpos = &p->bydst;
|
|
else if (policy->priority == p->priority &&
|
|
policy->pos > p->pos)
|
|
newpos = &p->bydst;
|
|
else
|
|
break;
|
|
}
|
|
|
|
if (newpos && policy->xdo.type != XFRM_DEV_OFFLOAD_PACKET)
|
|
hlist_add_behind_rcu(&policy->bydst, newpos);
|
|
else
|
|
hlist_add_head_rcu(&policy->bydst, &n->hhead);
|
|
|
|
/* paranoia checks follow.
|
|
* Check that the reinserted policy matches at least
|
|
* saddr or daddr for current node prefix.
|
|
*
|
|
* Matching both is fine, matching saddr in one policy
|
|
* (but not daddr) and then matching only daddr in another
|
|
* is a bug.
|
|
*/
|
|
matches_s = xfrm_policy_addr_delta(&policy->selector.saddr,
|
|
&n->addr,
|
|
n->prefixlen,
|
|
family) == 0;
|
|
matches_d = xfrm_policy_addr_delta(&policy->selector.daddr,
|
|
&n->addr,
|
|
n->prefixlen,
|
|
family) == 0;
|
|
if (matches_s && matches_d)
|
|
continue;
|
|
|
|
WARN_ON_ONCE(!matches_s && !matches_d);
|
|
if (matches_s)
|
|
matched_s++;
|
|
if (matches_d)
|
|
matched_d++;
|
|
WARN_ON_ONCE(matched_s && matched_d);
|
|
}
|
|
}
|
|
|
|
static void xfrm_policy_inexact_node_reinsert(struct net *net,
|
|
struct xfrm_pol_inexact_node *n,
|
|
struct rb_root *new,
|
|
u16 family)
|
|
{
|
|
struct xfrm_pol_inexact_node *node;
|
|
struct rb_node **p, *parent;
|
|
|
|
/* we should not have another subtree here */
|
|
WARN_ON_ONCE(!RB_EMPTY_ROOT(&n->root));
|
|
restart:
|
|
parent = NULL;
|
|
p = &new->rb_node;
|
|
while (*p) {
|
|
u8 prefixlen;
|
|
int delta;
|
|
|
|
parent = *p;
|
|
node = rb_entry(*p, struct xfrm_pol_inexact_node, node);
|
|
|
|
prefixlen = min(node->prefixlen, n->prefixlen);
|
|
|
|
delta = xfrm_policy_addr_delta(&n->addr, &node->addr,
|
|
prefixlen, family);
|
|
if (delta < 0) {
|
|
p = &parent->rb_left;
|
|
} else if (delta > 0) {
|
|
p = &parent->rb_right;
|
|
} else {
|
|
bool same_prefixlen = node->prefixlen == n->prefixlen;
|
|
struct xfrm_policy *tmp;
|
|
|
|
hlist_for_each_entry(tmp, &n->hhead, bydst) {
|
|
tmp->bydst_reinsert = true;
|
|
hlist_del_rcu(&tmp->bydst);
|
|
}
|
|
|
|
node->prefixlen = prefixlen;
|
|
|
|
xfrm_policy_inexact_list_reinsert(net, node, family);
|
|
|
|
if (same_prefixlen) {
|
|
kfree_rcu(n, rcu);
|
|
return;
|
|
}
|
|
|
|
rb_erase(*p, new);
|
|
kfree_rcu(n, rcu);
|
|
n = node;
|
|
goto restart;
|
|
}
|
|
}
|
|
|
|
rb_link_node_rcu(&n->node, parent, p);
|
|
rb_insert_color(&n->node, new);
|
|
}
|
|
|
|
/* merge nodes v and n */
|
|
static void xfrm_policy_inexact_node_merge(struct net *net,
|
|
struct xfrm_pol_inexact_node *v,
|
|
struct xfrm_pol_inexact_node *n,
|
|
u16 family)
|
|
{
|
|
struct xfrm_pol_inexact_node *node;
|
|
struct xfrm_policy *tmp;
|
|
struct rb_node *rnode;
|
|
|
|
/* To-be-merged node v has a subtree.
|
|
*
|
|
* Dismantle it and insert its nodes to n->root.
|
|
*/
|
|
while ((rnode = rb_first(&v->root)) != NULL) {
|
|
node = rb_entry(rnode, struct xfrm_pol_inexact_node, node);
|
|
rb_erase(&node->node, &v->root);
|
|
xfrm_policy_inexact_node_reinsert(net, node, &n->root,
|
|
family);
|
|
}
|
|
|
|
hlist_for_each_entry(tmp, &v->hhead, bydst) {
|
|
tmp->bydst_reinsert = true;
|
|
hlist_del_rcu(&tmp->bydst);
|
|
}
|
|
|
|
xfrm_policy_inexact_list_reinsert(net, n, family);
|
|
}
|
|
|
|
static struct xfrm_pol_inexact_node *
|
|
xfrm_policy_inexact_insert_node(struct net *net,
|
|
struct rb_root *root,
|
|
xfrm_address_t *addr,
|
|
u16 family, u8 prefixlen, u8 dir)
|
|
{
|
|
struct xfrm_pol_inexact_node *cached = NULL;
|
|
struct rb_node **p, *parent = NULL;
|
|
struct xfrm_pol_inexact_node *node;
|
|
|
|
p = &root->rb_node;
|
|
while (*p) {
|
|
int delta;
|
|
|
|
parent = *p;
|
|
node = rb_entry(*p, struct xfrm_pol_inexact_node, node);
|
|
|
|
delta = xfrm_policy_addr_delta(addr, &node->addr,
|
|
node->prefixlen,
|
|
family);
|
|
if (delta == 0 && prefixlen >= node->prefixlen) {
|
|
WARN_ON_ONCE(cached); /* ipsec policies got lost */
|
|
return node;
|
|
}
|
|
|
|
if (delta < 0)
|
|
p = &parent->rb_left;
|
|
else
|
|
p = &parent->rb_right;
|
|
|
|
if (prefixlen < node->prefixlen) {
|
|
delta = xfrm_policy_addr_delta(addr, &node->addr,
|
|
prefixlen,
|
|
family);
|
|
if (delta)
|
|
continue;
|
|
|
|
/* This node is a subnet of the new prefix. It needs
|
|
* to be removed and re-inserted with the smaller
|
|
* prefix and all nodes that are now also covered
|
|
* by the reduced prefixlen.
|
|
*/
|
|
rb_erase(&node->node, root);
|
|
|
|
if (!cached) {
|
|
xfrm_pol_inexact_node_init(node, addr,
|
|
prefixlen);
|
|
cached = node;
|
|
} else {
|
|
/* This node also falls within the new
|
|
* prefixlen. Merge the to-be-reinserted
|
|
* node and this one.
|
|
*/
|
|
xfrm_policy_inexact_node_merge(net, node,
|
|
cached, family);
|
|
kfree_rcu(node, rcu);
|
|
}
|
|
|
|
/* restart */
|
|
p = &root->rb_node;
|
|
parent = NULL;
|
|
}
|
|
}
|
|
|
|
node = cached;
|
|
if (!node) {
|
|
node = xfrm_pol_inexact_node_alloc(addr, prefixlen);
|
|
if (!node)
|
|
return NULL;
|
|
}
|
|
|
|
rb_link_node_rcu(&node->node, parent, p);
|
|
rb_insert_color(&node->node, root);
|
|
|
|
return node;
|
|
}
|
|
|
|
static void xfrm_policy_inexact_gc_tree(struct rb_root *r, bool rm)
|
|
{
|
|
struct xfrm_pol_inexact_node *node;
|
|
struct rb_node *rn = rb_first(r);
|
|
|
|
while (rn) {
|
|
node = rb_entry(rn, struct xfrm_pol_inexact_node, node);
|
|
|
|
xfrm_policy_inexact_gc_tree(&node->root, rm);
|
|
rn = rb_next(rn);
|
|
|
|
if (!hlist_empty(&node->hhead) || !RB_EMPTY_ROOT(&node->root)) {
|
|
WARN_ON_ONCE(rm);
|
|
continue;
|
|
}
|
|
|
|
rb_erase(&node->node, r);
|
|
kfree_rcu(node, rcu);
|
|
}
|
|
}
|
|
|
|
static void __xfrm_policy_inexact_prune_bin(struct xfrm_pol_inexact_bin *b, bool net_exit)
|
|
{
|
|
write_seqcount_begin(&b->count);
|
|
xfrm_policy_inexact_gc_tree(&b->root_d, net_exit);
|
|
xfrm_policy_inexact_gc_tree(&b->root_s, net_exit);
|
|
write_seqcount_end(&b->count);
|
|
|
|
if (!RB_EMPTY_ROOT(&b->root_d) || !RB_EMPTY_ROOT(&b->root_s) ||
|
|
!hlist_empty(&b->hhead)) {
|
|
WARN_ON_ONCE(net_exit);
|
|
return;
|
|
}
|
|
|
|
if (rhashtable_remove_fast(&xfrm_policy_inexact_table, &b->head,
|
|
xfrm_pol_inexact_params) == 0) {
|
|
list_del(&b->inexact_bins);
|
|
kfree_rcu(b, rcu);
|
|
}
|
|
}
|
|
|
|
static void xfrm_policy_inexact_prune_bin(struct xfrm_pol_inexact_bin *b)
|
|
{
|
|
struct net *net = read_pnet(&b->k.net);
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_policy_lock);
|
|
__xfrm_policy_inexact_prune_bin(b, false);
|
|
spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
|
|
}
|
|
|
|
static void __xfrm_policy_inexact_flush(struct net *net)
|
|
{
|
|
struct xfrm_pol_inexact_bin *bin, *t;
|
|
|
|
lockdep_assert_held(&net->xfrm.xfrm_policy_lock);
|
|
|
|
list_for_each_entry_safe(bin, t, &net->xfrm.inexact_bins, inexact_bins)
|
|
__xfrm_policy_inexact_prune_bin(bin, false);
|
|
}
|
|
|
|
static struct hlist_head *
|
|
xfrm_policy_inexact_alloc_chain(struct xfrm_pol_inexact_bin *bin,
|
|
struct xfrm_policy *policy, u8 dir)
|
|
{
|
|
struct xfrm_pol_inexact_node *n;
|
|
struct net *net;
|
|
|
|
net = xp_net(policy);
|
|
lockdep_assert_held(&net->xfrm.xfrm_policy_lock);
|
|
|
|
if (xfrm_policy_inexact_insert_use_any_list(policy))
|
|
return &bin->hhead;
|
|
|
|
if (xfrm_pol_inexact_addr_use_any_list(&policy->selector.daddr,
|
|
policy->family,
|
|
policy->selector.prefixlen_d)) {
|
|
write_seqcount_begin(&bin->count);
|
|
n = xfrm_policy_inexact_insert_node(net,
|
|
&bin->root_s,
|
|
&policy->selector.saddr,
|
|
policy->family,
|
|
policy->selector.prefixlen_s,
|
|
dir);
|
|
write_seqcount_end(&bin->count);
|
|
if (!n)
|
|
return NULL;
|
|
|
|
return &n->hhead;
|
|
}
|
|
|
|
/* daddr is fixed */
|
|
write_seqcount_begin(&bin->count);
|
|
n = xfrm_policy_inexact_insert_node(net,
|
|
&bin->root_d,
|
|
&policy->selector.daddr,
|
|
policy->family,
|
|
policy->selector.prefixlen_d, dir);
|
|
write_seqcount_end(&bin->count);
|
|
if (!n)
|
|
return NULL;
|
|
|
|
/* saddr is wildcard */
|
|
if (xfrm_pol_inexact_addr_use_any_list(&policy->selector.saddr,
|
|
policy->family,
|
|
policy->selector.prefixlen_s))
|
|
return &n->hhead;
|
|
|
|
write_seqcount_begin(&bin->count);
|
|
n = xfrm_policy_inexact_insert_node(net,
|
|
&n->root,
|
|
&policy->selector.saddr,
|
|
policy->family,
|
|
policy->selector.prefixlen_s, dir);
|
|
write_seqcount_end(&bin->count);
|
|
if (!n)
|
|
return NULL;
|
|
|
|
return &n->hhead;
|
|
}
|
|
|
|
static struct xfrm_policy *
|
|
xfrm_policy_inexact_insert(struct xfrm_policy *policy, u8 dir, int excl)
|
|
{
|
|
struct xfrm_pol_inexact_bin *bin;
|
|
struct xfrm_policy *delpol;
|
|
struct hlist_head *chain;
|
|
struct net *net;
|
|
|
|
bin = xfrm_policy_inexact_alloc_bin(policy, dir);
|
|
if (!bin)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
net = xp_net(policy);
|
|
lockdep_assert_held(&net->xfrm.xfrm_policy_lock);
|
|
|
|
chain = xfrm_policy_inexact_alloc_chain(bin, policy, dir);
|
|
if (!chain) {
|
|
__xfrm_policy_inexact_prune_bin(bin, false);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
delpol = xfrm_policy_insert_list(chain, policy, excl);
|
|
if (delpol && excl) {
|
|
__xfrm_policy_inexact_prune_bin(bin, false);
|
|
return ERR_PTR(-EEXIST);
|
|
}
|
|
|
|
chain = &net->xfrm.policy_inexact[dir];
|
|
xfrm_policy_insert_inexact_list(chain, policy);
|
|
|
|
if (delpol)
|
|
__xfrm_policy_inexact_prune_bin(bin, false);
|
|
|
|
return delpol;
|
|
}
|
|
|
|
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);
|
|
write_seqcount_begin(&net->xfrm.xfrm_policy_hash_generation);
|
|
|
|
/* make sure that we can insert the indirect policies again before
|
|
* we start with destructive action.
|
|
*/
|
|
list_for_each_entry(policy, &net->xfrm.policy_all, walk.all) {
|
|
struct xfrm_pol_inexact_bin *bin;
|
|
u8 dbits, sbits;
|
|
|
|
dir = xfrm_policy_id2dir(policy->index);
|
|
if (policy->walk.dead || dir >= XFRM_POLICY_MAX)
|
|
continue;
|
|
|
|
if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) {
|
|
if (policy->family == AF_INET) {
|
|
dbits = rbits4;
|
|
sbits = lbits4;
|
|
} else {
|
|
dbits = rbits6;
|
|
sbits = lbits6;
|
|
}
|
|
} else {
|
|
if (policy->family == AF_INET) {
|
|
dbits = lbits4;
|
|
sbits = rbits4;
|
|
} else {
|
|
dbits = lbits6;
|
|
sbits = rbits6;
|
|
}
|
|
}
|
|
|
|
if (policy->selector.prefixlen_d < dbits ||
|
|
policy->selector.prefixlen_s < sbits)
|
|
continue;
|
|
|
|
bin = xfrm_policy_inexact_alloc_bin(policy, dir);
|
|
if (!bin)
|
|
goto out_unlock;
|
|
|
|
if (!xfrm_policy_inexact_alloc_chain(bin, policy, dir))
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* reset the bydst and inexact table in all directions */
|
|
for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
|
|
struct hlist_node *n;
|
|
|
|
hlist_for_each_entry_safe(policy, n,
|
|
&net->xfrm.policy_inexact[dir],
|
|
bydst_inexact_list) {
|
|
hlist_del_rcu(&policy->bydst);
|
|
hlist_del_init(&policy->bydst_inexact_list);
|
|
}
|
|
|
|
hmask = net->xfrm.policy_bydst[dir].hmask;
|
|
odst = net->xfrm.policy_bydst[dir].table;
|
|
for (i = hmask; i >= 0; i--) {
|
|
hlist_for_each_entry_safe(policy, n, odst + i, bydst)
|
|
hlist_del_rcu(&policy->bydst);
|
|
}
|
|
if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) {
|
|
/* dir out => dst = remote, src = local */
|
|
net->xfrm.policy_bydst[dir].dbits4 = rbits4;
|
|
net->xfrm.policy_bydst[dir].sbits4 = lbits4;
|
|
net->xfrm.policy_bydst[dir].dbits6 = rbits6;
|
|
net->xfrm.policy_bydst[dir].sbits6 = lbits6;
|
|
} else {
|
|
/* dir in/fwd => dst = local, src = remote */
|
|
net->xfrm.policy_bydst[dir].dbits4 = lbits4;
|
|
net->xfrm.policy_bydst[dir].sbits4 = rbits4;
|
|
net->xfrm.policy_bydst[dir].dbits6 = lbits6;
|
|
net->xfrm.policy_bydst[dir].sbits6 = rbits6;
|
|
}
|
|
}
|
|
|
|
/* re-insert all policies by order of creation */
|
|
list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) {
|
|
if (policy->walk.dead)
|
|
continue;
|
|
dir = xfrm_policy_id2dir(policy->index);
|
|
if (dir >= XFRM_POLICY_MAX) {
|
|
/* skip socket policies */
|
|
continue;
|
|
}
|
|
newpos = NULL;
|
|
chain = policy_hash_bysel(net, &policy->selector,
|
|
policy->family, dir);
|
|
|
|
if (!chain) {
|
|
void *p = xfrm_policy_inexact_insert(policy, dir, 0);
|
|
|
|
WARN_ONCE(IS_ERR(p), "reinsert: %ld\n", PTR_ERR(p));
|
|
continue;
|
|
}
|
|
|
|
hlist_for_each_entry(pol, chain, bydst) {
|
|
if (policy->priority >= pol->priority)
|
|
newpos = &pol->bydst;
|
|
else
|
|
break;
|
|
}
|
|
if (newpos && policy->xdo.type != XFRM_DEV_OFFLOAD_PACKET)
|
|
hlist_add_behind_rcu(&policy->bydst, newpos);
|
|
else
|
|
hlist_add_head_rcu(&policy->bydst, chain);
|
|
}
|
|
|
|
out_unlock:
|
|
__xfrm_policy_inexact_flush(net);
|
|
write_seqcount_end(&net->xfrm.xfrm_policy_hash_generation);
|
|
spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
|
|
|
|
mutex_unlock(&hash_resize_mutex);
|
|
}
|
|
|
|
void xfrm_policy_hash_rebuild(struct net *net)
|
|
{
|
|
schedule_work(&net->xfrm.policy_hthresh.work);
|
|
}
|
|
EXPORT_SYMBOL(xfrm_policy_hash_rebuild);
|
|
|
|
/* Generate new index... KAME seems to generate them ordered by cost
|
|
* of an absolute inpredictability of ordering of rules. This will not pass. */
|
|
static u32 xfrm_gen_index(struct net *net, int dir, u32 index)
|
|
{
|
|
static u32 idx_generator;
|
|
|
|
for (;;) {
|
|
struct hlist_head *list;
|
|
struct xfrm_policy *p;
|
|
u32 idx;
|
|
int found;
|
|
|
|
if (!index) {
|
|
idx = (idx_generator | dir);
|
|
idx_generator += 8;
|
|
} else {
|
|
idx = index;
|
|
index = 0;
|
|
}
|
|
|
|
if (idx == 0)
|
|
idx = 8;
|
|
list = net->xfrm.policy_byidx + idx_hash(net, idx);
|
|
found = 0;
|
|
hlist_for_each_entry(p, list, byidx) {
|
|
if (p->index == idx) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (!found)
|
|
return idx;
|
|
}
|
|
}
|
|
|
|
static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
|
|
{
|
|
u32 *p1 = (u32 *) s1;
|
|
u32 *p2 = (u32 *) s2;
|
|
int len = sizeof(struct xfrm_selector) / sizeof(u32);
|
|
int i;
|
|
|
|
for (i = 0; i < len; i++) {
|
|
if (p1[i] != p2[i])
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void xfrm_policy_requeue(struct xfrm_policy *old,
|
|
struct xfrm_policy *new)
|
|
{
|
|
struct xfrm_policy_queue *pq = &old->polq;
|
|
struct sk_buff_head list;
|
|
|
|
if (skb_queue_empty(&pq->hold_queue))
|
|
return;
|
|
|
|
__skb_queue_head_init(&list);
|
|
|
|
spin_lock_bh(&pq->hold_queue.lock);
|
|
skb_queue_splice_init(&pq->hold_queue, &list);
|
|
if (del_timer(&pq->hold_timer))
|
|
xfrm_pol_put(old);
|
|
spin_unlock_bh(&pq->hold_queue.lock);
|
|
|
|
pq = &new->polq;
|
|
|
|
spin_lock_bh(&pq->hold_queue.lock);
|
|
skb_queue_splice(&list, &pq->hold_queue);
|
|
pq->timeout = XFRM_QUEUE_TMO_MIN;
|
|
if (!mod_timer(&pq->hold_timer, jiffies))
|
|
xfrm_pol_hold(new);
|
|
spin_unlock_bh(&pq->hold_queue.lock);
|
|
}
|
|
|
|
static inline bool xfrm_policy_mark_match(const struct xfrm_mark *mark,
|
|
struct xfrm_policy *pol)
|
|
{
|
|
return mark->v == pol->mark.v && mark->m == pol->mark.m;
|
|
}
|
|
|
|
static u32 xfrm_pol_bin_key(const void *data, u32 len, u32 seed)
|
|
{
|
|
const struct xfrm_pol_inexact_key *k = data;
|
|
u32 a = k->type << 24 | k->dir << 16 | k->family;
|
|
|
|
return jhash_3words(a, k->if_id, net_hash_mix(read_pnet(&k->net)),
|
|
seed);
|
|
}
|
|
|
|
static u32 xfrm_pol_bin_obj(const void *data, u32 len, u32 seed)
|
|
{
|
|
const struct xfrm_pol_inexact_bin *b = data;
|
|
|
|
return xfrm_pol_bin_key(&b->k, 0, seed);
|
|
}
|
|
|
|
static int xfrm_pol_bin_cmp(struct rhashtable_compare_arg *arg,
|
|
const void *ptr)
|
|
{
|
|
const struct xfrm_pol_inexact_key *key = arg->key;
|
|
const struct xfrm_pol_inexact_bin *b = ptr;
|
|
int ret;
|
|
|
|
if (!net_eq(read_pnet(&b->k.net), read_pnet(&key->net)))
|
|
return -1;
|
|
|
|
ret = b->k.dir ^ key->dir;
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = b->k.type ^ key->type;
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = b->k.family ^ key->family;
|
|
if (ret)
|
|
return ret;
|
|
|
|
return b->k.if_id ^ key->if_id;
|
|
}
|
|
|
|
static const struct rhashtable_params xfrm_pol_inexact_params = {
|
|
.head_offset = offsetof(struct xfrm_pol_inexact_bin, head),
|
|
.hashfn = xfrm_pol_bin_key,
|
|
.obj_hashfn = xfrm_pol_bin_obj,
|
|
.obj_cmpfn = xfrm_pol_bin_cmp,
|
|
.automatic_shrinking = true,
|
|
};
|
|
|
|
static void xfrm_policy_insert_inexact_list(struct hlist_head *chain,
|
|
struct xfrm_policy *policy)
|
|
{
|
|
struct xfrm_policy *pol, *delpol = NULL;
|
|
struct hlist_node *newpos = NULL;
|
|
int i = 0;
|
|
|
|
hlist_for_each_entry(pol, chain, bydst_inexact_list) {
|
|
if (pol->type == policy->type &&
|
|
pol->if_id == policy->if_id &&
|
|
!selector_cmp(&pol->selector, &policy->selector) &&
|
|
xfrm_policy_mark_match(&policy->mark, pol) &&
|
|
xfrm_sec_ctx_match(pol->security, policy->security) &&
|
|
!WARN_ON(delpol)) {
|
|
delpol = pol;
|
|
if (policy->priority > pol->priority)
|
|
continue;
|
|
} else if (policy->priority >= pol->priority) {
|
|
newpos = &pol->bydst_inexact_list;
|
|
continue;
|
|
}
|
|
if (delpol)
|
|
break;
|
|
}
|
|
|
|
if (newpos && policy->xdo.type != XFRM_DEV_OFFLOAD_PACKET)
|
|
hlist_add_behind_rcu(&policy->bydst_inexact_list, newpos);
|
|
else
|
|
hlist_add_head_rcu(&policy->bydst_inexact_list, chain);
|
|
|
|
hlist_for_each_entry(pol, chain, bydst_inexact_list) {
|
|
pol->pos = i;
|
|
i++;
|
|
}
|
|
}
|
|
|
|
static struct xfrm_policy *xfrm_policy_insert_list(struct hlist_head *chain,
|
|
struct xfrm_policy *policy,
|
|
bool excl)
|
|
{
|
|
struct xfrm_policy *pol, *newpos = NULL, *delpol = NULL;
|
|
|
|
hlist_for_each_entry(pol, chain, bydst) {
|
|
if (pol->type == policy->type &&
|
|
pol->if_id == policy->if_id &&
|
|
!selector_cmp(&pol->selector, &policy->selector) &&
|
|
xfrm_policy_mark_match(&policy->mark, pol) &&
|
|
xfrm_sec_ctx_match(pol->security, policy->security) &&
|
|
!WARN_ON(delpol)) {
|
|
if (excl)
|
|
return ERR_PTR(-EEXIST);
|
|
delpol = pol;
|
|
if (policy->priority > pol->priority)
|
|
continue;
|
|
} else if (policy->priority >= pol->priority) {
|
|
newpos = pol;
|
|
continue;
|
|
}
|
|
if (delpol)
|
|
break;
|
|
}
|
|
|
|
if (newpos && policy->xdo.type != XFRM_DEV_OFFLOAD_PACKET)
|
|
hlist_add_behind_rcu(&policy->bydst, &newpos->bydst);
|
|
else
|
|
/* Packet offload policies enter to the head
|
|
* to speed-up lookups.
|
|
*/
|
|
hlist_add_head_rcu(&policy->bydst, chain);
|
|
|
|
return delpol;
|
|
}
|
|
|
|
int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
|
|
{
|
|
struct net *net = xp_net(policy);
|
|
struct xfrm_policy *delpol;
|
|
struct hlist_head *chain;
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_policy_lock);
|
|
chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
|
|
if (chain)
|
|
delpol = xfrm_policy_insert_list(chain, policy, excl);
|
|
else
|
|
delpol = xfrm_policy_inexact_insert(policy, dir, excl);
|
|
|
|
if (IS_ERR(delpol)) {
|
|
spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
|
|
return PTR_ERR(delpol);
|
|
}
|
|
|
|
__xfrm_policy_link(policy, dir);
|
|
|
|
/* After previous checking, family can either be AF_INET or AF_INET6 */
|
|
if (policy->family == AF_INET)
|
|
rt_genid_bump_ipv4(net);
|
|
else
|
|
rt_genid_bump_ipv6(net);
|
|
|
|
if (delpol) {
|
|
xfrm_policy_requeue(delpol, policy);
|
|
__xfrm_policy_unlink(delpol, dir);
|
|
}
|
|
policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index);
|
|
hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
|
|
policy->curlft.add_time = ktime_get_real_seconds();
|
|
policy->curlft.use_time = 0;
|
|
if (!mod_timer(&policy->timer, jiffies + HZ))
|
|
xfrm_pol_hold(policy);
|
|
spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
|
|
|
|
if (delpol)
|
|
xfrm_policy_kill(delpol);
|
|
else if (xfrm_bydst_should_resize(net, dir, NULL))
|
|
schedule_work(&net->xfrm.policy_hash_work);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_policy_insert);
|
|
|
|
static struct xfrm_policy *
|
|
__xfrm_policy_bysel_ctx(struct hlist_head *chain, const struct xfrm_mark *mark,
|
|
u32 if_id, u8 type, int dir, struct xfrm_selector *sel,
|
|
struct xfrm_sec_ctx *ctx)
|
|
{
|
|
struct xfrm_policy *pol;
|
|
|
|
if (!chain)
|
|
return NULL;
|
|
|
|
hlist_for_each_entry(pol, chain, bydst) {
|
|
if (pol->type == type &&
|
|
pol->if_id == if_id &&
|
|
xfrm_policy_mark_match(mark, pol) &&
|
|
!selector_cmp(sel, &pol->selector) &&
|
|
xfrm_sec_ctx_match(ctx, pol->security))
|
|
return pol;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct xfrm_policy *
|
|
xfrm_policy_bysel_ctx(struct net *net, const struct xfrm_mark *mark, u32 if_id,
|
|
u8 type, int dir, struct xfrm_selector *sel,
|
|
struct xfrm_sec_ctx *ctx, int delete, int *err)
|
|
{
|
|
struct xfrm_pol_inexact_bin *bin = NULL;
|
|
struct xfrm_policy *pol, *ret = NULL;
|
|
struct hlist_head *chain;
|
|
|
|
*err = 0;
|
|
spin_lock_bh(&net->xfrm.xfrm_policy_lock);
|
|
chain = policy_hash_bysel(net, sel, sel->family, dir);
|
|
if (!chain) {
|
|
struct xfrm_pol_inexact_candidates cand;
|
|
int i;
|
|
|
|
bin = xfrm_policy_inexact_lookup(net, type,
|
|
sel->family, dir, if_id);
|
|
if (!bin) {
|
|
spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
|
|
return NULL;
|
|
}
|
|
|
|
if (!xfrm_policy_find_inexact_candidates(&cand, bin,
|
|
&sel->saddr,
|
|
&sel->daddr)) {
|
|
spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
|
|
return NULL;
|
|
}
|
|
|
|
pol = NULL;
|
|
for (i = 0; i < ARRAY_SIZE(cand.res); i++) {
|
|
struct xfrm_policy *tmp;
|
|
|
|
tmp = __xfrm_policy_bysel_ctx(cand.res[i], mark,
|
|
if_id, type, dir,
|
|
sel, ctx);
|
|
if (!tmp)
|
|
continue;
|
|
|
|
if (!pol || tmp->pos < pol->pos)
|
|
pol = tmp;
|
|
}
|
|
} else {
|
|
pol = __xfrm_policy_bysel_ctx(chain, mark, if_id, type, dir,
|
|
sel, ctx);
|
|
}
|
|
|
|
if (pol) {
|
|
xfrm_pol_hold(pol);
|
|
if (delete) {
|
|
*err = security_xfrm_policy_delete(pol->security);
|
|
if (*err) {
|
|
spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
|
|
return pol;
|
|
}
|
|
__xfrm_policy_unlink(pol, dir);
|
|
}
|
|
ret = pol;
|
|
}
|
|
spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
|
|
|
|
if (ret && delete)
|
|
xfrm_policy_kill(ret);
|
|
if (bin && delete)
|
|
xfrm_policy_inexact_prune_bin(bin);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
|
|
|
|
struct xfrm_policy *
|
|
xfrm_policy_byid(struct net *net, const struct xfrm_mark *mark, u32 if_id,
|
|
u8 type, int dir, u32 id, int delete, int *err)
|
|
{
|
|
struct xfrm_policy *pol, *ret;
|
|
struct hlist_head *chain;
|
|
|
|
*err = -ENOENT;
|
|
if (xfrm_policy_id2dir(id) != dir)
|
|
return NULL;
|
|
|
|
*err = 0;
|
|
spin_lock_bh(&net->xfrm.xfrm_policy_lock);
|
|
chain = net->xfrm.policy_byidx + idx_hash(net, id);
|
|
ret = NULL;
|
|
hlist_for_each_entry(pol, chain, byidx) {
|
|
if (pol->type == type && pol->index == id &&
|
|
pol->if_id == if_id && xfrm_policy_mark_match(mark, pol)) {
|
|
xfrm_pol_hold(pol);
|
|
if (delete) {
|
|
*err = security_xfrm_policy_delete(
|
|
pol->security);
|
|
if (*err) {
|
|
spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
|
|
return pol;
|
|
}
|
|
__xfrm_policy_unlink(pol, dir);
|
|
}
|
|
ret = pol;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
|
|
|
|
if (ret && delete)
|
|
xfrm_policy_kill(ret);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_policy_byid);
|
|
|
|
#ifdef CONFIG_SECURITY_NETWORK_XFRM
|
|
static inline int
|
|
xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
|
|
{
|
|
struct xfrm_policy *pol;
|
|
int err = 0;
|
|
|
|
list_for_each_entry(pol, &net->xfrm.policy_all, walk.all) {
|
|
if (pol->walk.dead ||
|
|
xfrm_policy_id2dir(pol->index) >= XFRM_POLICY_MAX ||
|
|
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;
|
|
}
|
|
|
|
static inline int xfrm_dev_policy_flush_secctx_check(struct net *net,
|
|
struct net_device *dev,
|
|
bool task_valid)
|
|
{
|
|
struct xfrm_policy *pol;
|
|
int err = 0;
|
|
|
|
list_for_each_entry(pol, &net->xfrm.policy_all, walk.all) {
|
|
if (pol->walk.dead ||
|
|
xfrm_policy_id2dir(pol->index) >= XFRM_POLICY_MAX ||
|
|
pol->xdo.dev != dev)
|
|
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;
|
|
}
|
|
|
|
static inline int xfrm_dev_policy_flush_secctx_check(struct net *net,
|
|
struct net_device *dev,
|
|
bool task_valid)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
int xfrm_policy_flush(struct net *net, u8 type, bool task_valid)
|
|
{
|
|
int dir, err = 0, cnt = 0;
|
|
struct xfrm_policy *pol;
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_policy_lock);
|
|
|
|
err = xfrm_policy_flush_secctx_check(net, type, task_valid);
|
|
if (err)
|
|
goto out;
|
|
|
|
again:
|
|
list_for_each_entry(pol, &net->xfrm.policy_all, walk.all) {
|
|
dir = xfrm_policy_id2dir(pol->index);
|
|
if (pol->walk.dead ||
|
|
dir >= XFRM_POLICY_MAX ||
|
|
pol->type != type)
|
|
continue;
|
|
|
|
__xfrm_policy_unlink(pol, dir);
|
|
spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
|
|
xfrm_dev_policy_delete(pol);
|
|
cnt++;
|
|
xfrm_audit_policy_delete(pol, 1, task_valid);
|
|
xfrm_policy_kill(pol);
|
|
spin_lock_bh(&net->xfrm.xfrm_policy_lock);
|
|
goto again;
|
|
}
|
|
if (cnt)
|
|
__xfrm_policy_inexact_flush(net);
|
|
else
|
|
err = -ESRCH;
|
|
out:
|
|
spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_policy_flush);
|
|
|
|
int xfrm_dev_policy_flush(struct net *net, struct net_device *dev,
|
|
bool task_valid)
|
|
{
|
|
int dir, err = 0, cnt = 0;
|
|
struct xfrm_policy *pol;
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_policy_lock);
|
|
|
|
err = xfrm_dev_policy_flush_secctx_check(net, dev, task_valid);
|
|
if (err)
|
|
goto out;
|
|
|
|
again:
|
|
list_for_each_entry(pol, &net->xfrm.policy_all, walk.all) {
|
|
dir = xfrm_policy_id2dir(pol->index);
|
|
if (pol->walk.dead ||
|
|
dir >= XFRM_POLICY_MAX ||
|
|
pol->xdo.dev != dev)
|
|
continue;
|
|
|
|
__xfrm_policy_unlink(pol, dir);
|
|
spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
|
|
xfrm_dev_policy_delete(pol);
|
|
cnt++;
|
|
xfrm_audit_policy_delete(pol, 1, task_valid);
|
|
xfrm_policy_kill(pol);
|
|
spin_lock_bh(&net->xfrm.xfrm_policy_lock);
|
|
goto again;
|
|
}
|
|
if (cnt)
|
|
__xfrm_policy_inexact_flush(net);
|
|
else
|
|
err = -ESRCH;
|
|
out:
|
|
spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_dev_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, u32 if_id)
|
|
{
|
|
const struct xfrm_selector *sel = &pol->selector;
|
|
int ret = -ESRCH;
|
|
bool match;
|
|
|
|
if (pol->family != family ||
|
|
pol->if_id != if_id ||
|
|
(fl->flowi_mark & pol->mark.m) != pol->mark.v ||
|
|
pol->type != type)
|
|
return ret;
|
|
|
|
match = xfrm_selector_match(sel, fl, family);
|
|
if (match)
|
|
ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid);
|
|
return ret;
|
|
}
|
|
|
|
static struct xfrm_pol_inexact_node *
|
|
xfrm_policy_lookup_inexact_addr(const struct rb_root *r,
|
|
seqcount_spinlock_t *count,
|
|
const xfrm_address_t *addr, u16 family)
|
|
{
|
|
const struct rb_node *parent;
|
|
int seq;
|
|
|
|
again:
|
|
seq = read_seqcount_begin(count);
|
|
|
|
parent = rcu_dereference_raw(r->rb_node);
|
|
while (parent) {
|
|
struct xfrm_pol_inexact_node *node;
|
|
int delta;
|
|
|
|
node = rb_entry(parent, struct xfrm_pol_inexact_node, node);
|
|
|
|
delta = xfrm_policy_addr_delta(addr, &node->addr,
|
|
node->prefixlen, family);
|
|
if (delta < 0) {
|
|
parent = rcu_dereference_raw(parent->rb_left);
|
|
continue;
|
|
} else if (delta > 0) {
|
|
parent = rcu_dereference_raw(parent->rb_right);
|
|
continue;
|
|
}
|
|
|
|
return node;
|
|
}
|
|
|
|
if (read_seqcount_retry(count, seq))
|
|
goto again;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static bool
|
|
xfrm_policy_find_inexact_candidates(struct xfrm_pol_inexact_candidates *cand,
|
|
struct xfrm_pol_inexact_bin *b,
|
|
const xfrm_address_t *saddr,
|
|
const xfrm_address_t *daddr)
|
|
{
|
|
struct xfrm_pol_inexact_node *n;
|
|
u16 family;
|
|
|
|
if (!b)
|
|
return false;
|
|
|
|
family = b->k.family;
|
|
memset(cand, 0, sizeof(*cand));
|
|
cand->res[XFRM_POL_CAND_ANY] = &b->hhead;
|
|
|
|
n = xfrm_policy_lookup_inexact_addr(&b->root_d, &b->count, daddr,
|
|
family);
|
|
if (n) {
|
|
cand->res[XFRM_POL_CAND_DADDR] = &n->hhead;
|
|
n = xfrm_policy_lookup_inexact_addr(&n->root, &b->count, saddr,
|
|
family);
|
|
if (n)
|
|
cand->res[XFRM_POL_CAND_BOTH] = &n->hhead;
|
|
}
|
|
|
|
n = xfrm_policy_lookup_inexact_addr(&b->root_s, &b->count, saddr,
|
|
family);
|
|
if (n)
|
|
cand->res[XFRM_POL_CAND_SADDR] = &n->hhead;
|
|
|
|
return true;
|
|
}
|
|
|
|
static struct xfrm_pol_inexact_bin *
|
|
xfrm_policy_inexact_lookup_rcu(struct net *net, u8 type, u16 family,
|
|
u8 dir, u32 if_id)
|
|
{
|
|
struct xfrm_pol_inexact_key k = {
|
|
.family = family,
|
|
.type = type,
|
|
.dir = dir,
|
|
.if_id = if_id,
|
|
};
|
|
|
|
write_pnet(&k.net, net);
|
|
|
|
return rhashtable_lookup(&xfrm_policy_inexact_table, &k,
|
|
xfrm_pol_inexact_params);
|
|
}
|
|
|
|
static struct xfrm_pol_inexact_bin *
|
|
xfrm_policy_inexact_lookup(struct net *net, u8 type, u16 family,
|
|
u8 dir, u32 if_id)
|
|
{
|
|
struct xfrm_pol_inexact_bin *bin;
|
|
|
|
lockdep_assert_held(&net->xfrm.xfrm_policy_lock);
|
|
|
|
rcu_read_lock();
|
|
bin = xfrm_policy_inexact_lookup_rcu(net, type, family, dir, if_id);
|
|
rcu_read_unlock();
|
|
|
|
return bin;
|
|
}
|
|
|
|
static struct xfrm_policy *
|
|
__xfrm_policy_eval_candidates(struct hlist_head *chain,
|
|
struct xfrm_policy *prefer,
|
|
const struct flowi *fl,
|
|
u8 type, u16 family, u32 if_id)
|
|
{
|
|
u32 priority = prefer ? prefer->priority : ~0u;
|
|
struct xfrm_policy *pol;
|
|
|
|
if (!chain)
|
|
return NULL;
|
|
|
|
hlist_for_each_entry_rcu(pol, chain, bydst) {
|
|
int err;
|
|
|
|
if (pol->priority > priority)
|
|
break;
|
|
|
|
err = xfrm_policy_match(pol, fl, type, family, if_id);
|
|
if (err) {
|
|
if (err != -ESRCH)
|
|
return ERR_PTR(err);
|
|
|
|
continue;
|
|
}
|
|
|
|
if (prefer) {
|
|
/* matches. Is it older than *prefer? */
|
|
if (pol->priority == priority &&
|
|
prefer->pos < pol->pos)
|
|
return prefer;
|
|
}
|
|
|
|
return pol;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct xfrm_policy *
|
|
xfrm_policy_eval_candidates(struct xfrm_pol_inexact_candidates *cand,
|
|
struct xfrm_policy *prefer,
|
|
const struct flowi *fl,
|
|
u8 type, u16 family, u32 if_id)
|
|
{
|
|
struct xfrm_policy *tmp;
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(cand->res); i++) {
|
|
tmp = __xfrm_policy_eval_candidates(cand->res[i],
|
|
prefer,
|
|
fl, type, family, if_id);
|
|
if (!tmp)
|
|
continue;
|
|
|
|
if (IS_ERR(tmp))
|
|
return tmp;
|
|
prefer = tmp;
|
|
}
|
|
|
|
return prefer;
|
|
}
|
|
|
|
static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
|
|
const struct flowi *fl,
|
|
u16 family, u8 dir,
|
|
u32 if_id)
|
|
{
|
|
struct xfrm_pol_inexact_candidates cand;
|
|
const xfrm_address_t *daddr, *saddr;
|
|
struct xfrm_pol_inexact_bin *bin;
|
|
struct xfrm_policy *pol, *ret;
|
|
struct hlist_head *chain;
|
|
unsigned int sequence;
|
|
int err;
|
|
|
|
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(&net->xfrm.xfrm_policy_hash_generation);
|
|
chain = policy_hash_direct(net, daddr, saddr, family, dir);
|
|
} while (read_seqcount_retry(&net->xfrm.xfrm_policy_hash_generation, sequence));
|
|
|
|
ret = NULL;
|
|
hlist_for_each_entry_rcu(pol, chain, bydst) {
|
|
err = xfrm_policy_match(pol, fl, type, family, if_id);
|
|
if (err) {
|
|
if (err == -ESRCH)
|
|
continue;
|
|
else {
|
|
ret = ERR_PTR(err);
|
|
goto fail;
|
|
}
|
|
} else {
|
|
ret = pol;
|
|
break;
|
|
}
|
|
}
|
|
if (ret && ret->xdo.type == XFRM_DEV_OFFLOAD_PACKET)
|
|
goto skip_inexact;
|
|
|
|
bin = xfrm_policy_inexact_lookup_rcu(net, type, family, dir, if_id);
|
|
if (!bin || !xfrm_policy_find_inexact_candidates(&cand, bin, saddr,
|
|
daddr))
|
|
goto skip_inexact;
|
|
|
|
pol = xfrm_policy_eval_candidates(&cand, ret, fl, type,
|
|
family, if_id);
|
|
if (pol) {
|
|
ret = pol;
|
|
if (IS_ERR(pol))
|
|
goto fail;
|
|
}
|
|
|
|
skip_inexact:
|
|
if (read_seqcount_retry(&net->xfrm.xfrm_policy_hash_generation, sequence))
|
|
goto retry;
|
|
|
|
if (ret && !xfrm_pol_hold_rcu(ret))
|
|
goto retry;
|
|
fail:
|
|
rcu_read_unlock();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct xfrm_policy *xfrm_policy_lookup(struct net *net,
|
|
const struct flowi *fl,
|
|
u16 family, u8 dir, u32 if_id)
|
|
{
|
|
#ifdef CONFIG_XFRM_SUB_POLICY
|
|
struct xfrm_policy *pol;
|
|
|
|
pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family,
|
|
dir, if_id);
|
|
if (pol != NULL)
|
|
return pol;
|
|
#endif
|
|
return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family,
|
|
dir, if_id);
|
|
}
|
|
|
|
static struct xfrm_policy *xfrm_sk_policy_lookup(const struct sock *sk, int dir,
|
|
const struct flowi *fl,
|
|
u16 family, u32 if_id)
|
|
{
|
|
struct xfrm_policy *pol;
|
|
|
|
rcu_read_lock();
|
|
again:
|
|
pol = rcu_dereference(sk->sk_policy[dir]);
|
|
if (pol != NULL) {
|
|
bool match;
|
|
int err = 0;
|
|
|
|
if (pol->family != family) {
|
|
pol = NULL;
|
|
goto out;
|
|
}
|
|
|
|
match = xfrm_selector_match(&pol->selector, fl, family);
|
|
if (match) {
|
|
if ((sk->sk_mark & pol->mark.m) != pol->mark.v ||
|
|
pol->if_id != if_id) {
|
|
pol = NULL;
|
|
goto out;
|
|
}
|
|
err = security_xfrm_policy_lookup(pol->security,
|
|
fl->flowi_secid);
|
|
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_init(&pol->bydst_inexact_list);
|
|
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_dev_policy_delete(pol);
|
|
xfrm_policy_kill(pol);
|
|
return 0;
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_policy_delete);
|
|
|
|
int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
|
|
{
|
|
struct net *net = sock_net(sk);
|
|
struct xfrm_policy *old_pol;
|
|
|
|
#ifdef CONFIG_XFRM_SUB_POLICY
|
|
if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
|
|
return -EINVAL;
|
|
#endif
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_policy_lock);
|
|
old_pol = rcu_dereference_protected(sk->sk_policy[dir],
|
|
lockdep_is_held(&net->xfrm.xfrm_policy_lock));
|
|
if (pol) {
|
|
pol->curlft.add_time = ktime_get_real_seconds();
|
|
pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0);
|
|
xfrm_sk_policy_link(pol, dir);
|
|
}
|
|
rcu_assign_pointer(sk->sk_policy[dir], pol);
|
|
if (old_pol) {
|
|
if (pol)
|
|
xfrm_policy_requeue(old_pol, pol);
|
|
|
|
/* Unlinking succeeds always. This is the only function
|
|
* allowed to delete or replace socket policy.
|
|
*/
|
|
xfrm_sk_policy_unlink(old_pol, dir);
|
|
}
|
|
spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
|
|
|
|
if (old_pol) {
|
|
xfrm_policy_kill(old_pol);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
|
|
{
|
|
struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
|
|
struct net *net = xp_net(old);
|
|
|
|
if (newp) {
|
|
newp->selector = old->selector;
|
|
if (security_xfrm_policy_clone(old->security,
|
|
&newp->security)) {
|
|
kfree(newp);
|
|
return NULL; /* ENOMEM */
|
|
}
|
|
newp->lft = old->lft;
|
|
newp->curlft = old->curlft;
|
|
newp->mark = old->mark;
|
|
newp->if_id = old->if_id;
|
|
newp->action = old->action;
|
|
newp->flags = old->flags;
|
|
newp->xfrm_nr = old->xfrm_nr;
|
|
newp->index = old->index;
|
|
newp->type = old->type;
|
|
newp->family = old->family;
|
|
memcpy(newp->xfrm_vec, old->xfrm_vec,
|
|
newp->xfrm_nr*sizeof(struct xfrm_tmpl));
|
|
spin_lock_bh(&net->xfrm.xfrm_policy_lock);
|
|
xfrm_sk_policy_link(newp, dir);
|
|
spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
|
|
xfrm_pol_put(newp);
|
|
}
|
|
return newp;
|
|
}
|
|
|
|
int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
|
|
{
|
|
const struct xfrm_policy *p;
|
|
struct xfrm_policy *np;
|
|
int i, ret = 0;
|
|
|
|
rcu_read_lock();
|
|
for (i = 0; i < 2; i++) {
|
|
p = rcu_dereference(osk->sk_policy[i]);
|
|
if (p) {
|
|
np = clone_policy(p, i);
|
|
if (unlikely(!np)) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
rcu_assign_pointer(sk->sk_policy[i], np);
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
xfrm_get_saddr(struct net *net, int oif, xfrm_address_t *local,
|
|
xfrm_address_t *remote, unsigned short family, u32 mark)
|
|
{
|
|
int err;
|
|
const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
|
|
|
|
if (unlikely(afinfo == NULL))
|
|
return -EINVAL;
|
|
err = afinfo->get_saddr(net, oif, local, remote, mark);
|
|
rcu_read_unlock();
|
|
return err;
|
|
}
|
|
|
|
/* Resolve list of templates for the flow, given policy. */
|
|
|
|
static int
|
|
xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
|
|
struct xfrm_state **xfrm, unsigned short family)
|
|
{
|
|
struct net *net = xp_net(policy);
|
|
int nx;
|
|
int i, error;
|
|
xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
|
|
xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
|
|
xfrm_address_t tmp;
|
|
|
|
for (nx = 0, i = 0; i < policy->xfrm_nr; i++) {
|
|
struct xfrm_state *x;
|
|
xfrm_address_t *remote = daddr;
|
|
xfrm_address_t *local = saddr;
|
|
struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
|
|
|
|
if (tmpl->mode == XFRM_MODE_TUNNEL ||
|
|
tmpl->mode == XFRM_MODE_BEET) {
|
|
remote = &tmpl->id.daddr;
|
|
local = &tmpl->saddr;
|
|
if (xfrm_addr_any(local, tmpl->encap_family)) {
|
|
error = xfrm_get_saddr(net, fl->flowi_oif,
|
|
&tmp, remote,
|
|
tmpl->encap_family, 0);
|
|
if (error)
|
|
goto fail;
|
|
local = &tmp;
|
|
}
|
|
}
|
|
|
|
x = xfrm_state_find(remote, local, fl, tmpl, policy, &error,
|
|
family, policy->if_id);
|
|
|
|
if (x && x->km.state == XFRM_STATE_VALID) {
|
|
xfrm[nx++] = x;
|
|
daddr = remote;
|
|
saddr = local;
|
|
continue;
|
|
}
|
|
if (x) {
|
|
error = (x->km.state == XFRM_STATE_ERROR ?
|
|
-EINVAL : -EAGAIN);
|
|
xfrm_state_put(x);
|
|
} else if (error == -ESRCH) {
|
|
error = -EAGAIN;
|
|
}
|
|
|
|
if (!tmpl->optional)
|
|
goto fail;
|
|
}
|
|
return nx;
|
|
|
|
fail:
|
|
for (nx--; nx >= 0; nx--)
|
|
xfrm_state_put(xfrm[nx]);
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl,
|
|
struct xfrm_state **xfrm, unsigned short family)
|
|
{
|
|
struct xfrm_state *tp[XFRM_MAX_DEPTH];
|
|
struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
|
|
int cnx = 0;
|
|
int error;
|
|
int ret;
|
|
int i;
|
|
|
|
for (i = 0; i < npols; i++) {
|
|
if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
|
|
error = -ENOBUFS;
|
|
goto fail;
|
|
}
|
|
|
|
ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
|
|
if (ret < 0) {
|
|
error = ret;
|
|
goto fail;
|
|
} else
|
|
cnx += ret;
|
|
}
|
|
|
|
/* found states are sorted for outbound processing */
|
|
if (npols > 1)
|
|
xfrm_state_sort(xfrm, tpp, cnx, family);
|
|
|
|
return cnx;
|
|
|
|
fail:
|
|
for (cnx--; cnx >= 0; cnx--)
|
|
xfrm_state_put(tpp[cnx]);
|
|
return error;
|
|
|
|
}
|
|
|
|
static int xfrm_get_tos(const struct flowi *fl, int family)
|
|
{
|
|
if (family == AF_INET)
|
|
return IPTOS_RT_MASK & fl->u.ip4.flowi4_tos;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
|
|
{
|
|
const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
|
|
struct dst_ops *dst_ops;
|
|
struct xfrm_dst *xdst;
|
|
|
|
if (!afinfo)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
switch (family) {
|
|
case AF_INET:
|
|
dst_ops = &net->xfrm.xfrm4_dst_ops;
|
|
break;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case AF_INET6:
|
|
dst_ops = &net->xfrm.xfrm6_dst_ops;
|
|
break;
|
|
#endif
|
|
default:
|
|
BUG();
|
|
}
|
|
xdst = dst_alloc(dst_ops, NULL, 1, DST_OBSOLETE_NONE, 0);
|
|
|
|
if (likely(xdst)) {
|
|
memset_after(xdst, 0, u.dst);
|
|
} else
|
|
xdst = ERR_PTR(-ENOBUFS);
|
|
|
|
rcu_read_unlock();
|
|
|
|
return xdst;
|
|
}
|
|
|
|
static void xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
|
|
int nfheader_len)
|
|
{
|
|
if (dst->ops->family == AF_INET6) {
|
|
struct rt6_info *rt = (struct rt6_info *)dst;
|
|
path->path_cookie = rt6_get_cookie(rt);
|
|
path->u.rt6.rt6i_nfheader_len = nfheader_len;
|
|
}
|
|
}
|
|
|
|
static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
|
|
const struct flowi *fl)
|
|
{
|
|
const struct xfrm_policy_afinfo *afinfo =
|
|
xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
|
|
int err;
|
|
|
|
if (!afinfo)
|
|
return -EINVAL;
|
|
|
|
err = afinfo->fill_dst(xdst, dev, fl);
|
|
|
|
rcu_read_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
|
|
/* Allocate chain of dst_entry's, attach known xfrm's, calculate
|
|
* all the metrics... Shortly, bundle a bundle.
|
|
*/
|
|
|
|
static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
|
|
struct xfrm_state **xfrm,
|
|
struct xfrm_dst **bundle,
|
|
int nx,
|
|
const struct flowi *fl,
|
|
struct dst_entry *dst)
|
|
{
|
|
const struct xfrm_state_afinfo *afinfo;
|
|
const struct xfrm_mode *inner_mode;
|
|
struct net *net = xp_net(policy);
|
|
unsigned long now = jiffies;
|
|
struct net_device *dev;
|
|
struct xfrm_dst *xdst_prev = NULL;
|
|
struct xfrm_dst *xdst0 = NULL;
|
|
int i = 0;
|
|
int err;
|
|
int header_len = 0;
|
|
int nfheader_len = 0;
|
|
int trailer_len = 0;
|
|
int tos;
|
|
int family = policy->selector.family;
|
|
xfrm_address_t saddr, daddr;
|
|
|
|
xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
|
|
|
|
tos = xfrm_get_tos(fl, family);
|
|
|
|
dst_hold(dst);
|
|
|
|
for (; i < nx; i++) {
|
|
struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
|
|
struct dst_entry *dst1 = &xdst->u.dst;
|
|
|
|
err = PTR_ERR(xdst);
|
|
if (IS_ERR(xdst)) {
|
|
dst_release(dst);
|
|
goto put_states;
|
|
}
|
|
|
|
bundle[i] = xdst;
|
|
if (!xdst_prev)
|
|
xdst0 = xdst;
|
|
else
|
|
/* Ref count is taken during xfrm_alloc_dst()
|
|
* No need to do dst_clone() on dst1
|
|
*/
|
|
xfrm_dst_set_child(xdst_prev, &xdst->u.dst);
|
|
|
|
if (xfrm[i]->sel.family == AF_UNSPEC) {
|
|
inner_mode = xfrm_ip2inner_mode(xfrm[i],
|
|
xfrm_af2proto(family));
|
|
if (!inner_mode) {
|
|
err = -EAFNOSUPPORT;
|
|
dst_release(dst);
|
|
goto put_states;
|
|
}
|
|
} else
|
|
inner_mode = &xfrm[i]->inner_mode;
|
|
|
|
xdst->route = dst;
|
|
dst_copy_metrics(dst1, dst);
|
|
|
|
if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
|
|
__u32 mark = 0;
|
|
int oif;
|
|
|
|
if (xfrm[i]->props.smark.v || xfrm[i]->props.smark.m)
|
|
mark = xfrm_smark_get(fl->flowi_mark, xfrm[i]);
|
|
|
|
family = xfrm[i]->props.family;
|
|
oif = fl->flowi_oif ? : fl->flowi_l3mdev;
|
|
dst = xfrm_dst_lookup(xfrm[i], tos, oif,
|
|
&saddr, &daddr, family, mark);
|
|
err = PTR_ERR(dst);
|
|
if (IS_ERR(dst))
|
|
goto put_states;
|
|
} else
|
|
dst_hold(dst);
|
|
|
|
dst1->xfrm = xfrm[i];
|
|
xdst->xfrm_genid = xfrm[i]->genid;
|
|
|
|
dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
|
|
dst1->lastuse = now;
|
|
|
|
dst1->input = dst_discard;
|
|
|
|
rcu_read_lock();
|
|
afinfo = xfrm_state_afinfo_get_rcu(inner_mode->family);
|
|
if (likely(afinfo))
|
|
dst1->output = afinfo->output;
|
|
else
|
|
dst1->output = dst_discard_out;
|
|
rcu_read_unlock();
|
|
|
|
xdst_prev = xdst;
|
|
|
|
header_len += xfrm[i]->props.header_len;
|
|
if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
|
|
nfheader_len += xfrm[i]->props.header_len;
|
|
trailer_len += xfrm[i]->props.trailer_len;
|
|
}
|
|
|
|
xfrm_dst_set_child(xdst_prev, dst);
|
|
xdst0->path = dst;
|
|
|
|
err = -ENODEV;
|
|
dev = dst->dev;
|
|
if (!dev)
|
|
goto free_dst;
|
|
|
|
xfrm_init_path(xdst0, dst, nfheader_len);
|
|
xfrm_init_pmtu(bundle, nx);
|
|
|
|
for (xdst_prev = xdst0; xdst_prev != (struct xfrm_dst *)dst;
|
|
xdst_prev = (struct xfrm_dst *) xfrm_dst_child(&xdst_prev->u.dst)) {
|
|
err = xfrm_fill_dst(xdst_prev, dev, fl);
|
|
if (err)
|
|
goto free_dst;
|
|
|
|
xdst_prev->u.dst.header_len = header_len;
|
|
xdst_prev->u.dst.trailer_len = trailer_len;
|
|
header_len -= xdst_prev->u.dst.xfrm->props.header_len;
|
|
trailer_len -= xdst_prev->u.dst.xfrm->props.trailer_len;
|
|
}
|
|
|
|
return &xdst0->u.dst;
|
|
|
|
put_states:
|
|
for (; i < nx; i++)
|
|
xfrm_state_put(xfrm[i]);
|
|
free_dst:
|
|
if (xdst0)
|
|
dst_release_immediate(&xdst0->u.dst);
|
|
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static int xfrm_expand_policies(const struct flowi *fl, u16 family,
|
|
struct xfrm_policy **pols,
|
|
int *num_pols, int *num_xfrms)
|
|
{
|
|
int i;
|
|
|
|
if (*num_pols == 0 || !pols[0]) {
|
|
*num_pols = 0;
|
|
*num_xfrms = 0;
|
|
return 0;
|
|
}
|
|
if (IS_ERR(pols[0])) {
|
|
*num_pols = 0;
|
|
return PTR_ERR(pols[0]);
|
|
}
|
|
|
|
*num_xfrms = pols[0]->xfrm_nr;
|
|
|
|
#ifdef CONFIG_XFRM_SUB_POLICY
|
|
if (pols[0]->action == XFRM_POLICY_ALLOW &&
|
|
pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
|
|
pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
|
|
XFRM_POLICY_TYPE_MAIN,
|
|
fl, family,
|
|
XFRM_POLICY_OUT,
|
|
pols[0]->if_id);
|
|
if (pols[1]) {
|
|
if (IS_ERR(pols[1])) {
|
|
xfrm_pols_put(pols, *num_pols);
|
|
*num_pols = 0;
|
|
return PTR_ERR(pols[1]);
|
|
}
|
|
(*num_pols)++;
|
|
(*num_xfrms) += pols[1]->xfrm_nr;
|
|
}
|
|
}
|
|
#endif
|
|
for (i = 0; i < *num_pols; i++) {
|
|
if (pols[i]->action != XFRM_POLICY_ALLOW) {
|
|
*num_xfrms = -1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static struct xfrm_dst *
|
|
xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
|
|
const struct flowi *fl, u16 family,
|
|
struct dst_entry *dst_orig)
|
|
{
|
|
struct net *net = xp_net(pols[0]);
|
|
struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
|
|
struct xfrm_dst *bundle[XFRM_MAX_DEPTH];
|
|
struct xfrm_dst *xdst;
|
|
struct dst_entry *dst;
|
|
int err;
|
|
|
|
/* Try to instantiate a bundle */
|
|
err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
|
|
if (err <= 0) {
|
|
if (err == 0)
|
|
return NULL;
|
|
|
|
if (err != -EAGAIN)
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
dst = xfrm_bundle_create(pols[0], xfrm, bundle, err, fl, dst_orig);
|
|
if (IS_ERR(dst)) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
|
|
return ERR_CAST(dst);
|
|
}
|
|
|
|
xdst = (struct xfrm_dst *)dst;
|
|
xdst->num_xfrms = err;
|
|
xdst->num_pols = num_pols;
|
|
memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
|
|
xdst->policy_genid = atomic_read(&pols[0]->genid);
|
|
|
|
return xdst;
|
|
}
|
|
|
|
static void xfrm_policy_queue_process(struct timer_list *t)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct sock *sk;
|
|
struct dst_entry *dst;
|
|
struct xfrm_policy *pol = from_timer(pol, t, polq.hold_timer);
|
|
struct net *net = xp_net(pol);
|
|
struct xfrm_policy_queue *pq = &pol->polq;
|
|
struct flowi fl;
|
|
struct sk_buff_head list;
|
|
__u32 skb_mark;
|
|
|
|
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;
|
|
|
|
/* Fixup the mark to support VTI. */
|
|
skb_mark = skb->mark;
|
|
skb->mark = pol->mark.v;
|
|
xfrm_decode_session(skb, &fl, dst->ops->family);
|
|
skb->mark = skb_mark;
|
|
spin_unlock(&pq->hold_queue.lock);
|
|
|
|
dst_hold(xfrm_dst_path(dst));
|
|
dst = xfrm_lookup(net, xfrm_dst_path(dst), &fl, sk, XFRM_LOOKUP_QUEUE);
|
|
if (IS_ERR(dst))
|
|
goto purge_queue;
|
|
|
|
if (dst->flags & DST_XFRM_QUEUE) {
|
|
dst_release(dst);
|
|
|
|
if (pq->timeout >= XFRM_QUEUE_TMO_MAX)
|
|
goto purge_queue;
|
|
|
|
pq->timeout = pq->timeout << 1;
|
|
if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout))
|
|
xfrm_pol_hold(pol);
|
|
goto out;
|
|
}
|
|
|
|
dst_release(dst);
|
|
|
|
__skb_queue_head_init(&list);
|
|
|
|
spin_lock(&pq->hold_queue.lock);
|
|
pq->timeout = 0;
|
|
skb_queue_splice_init(&pq->hold_queue, &list);
|
|
spin_unlock(&pq->hold_queue.lock);
|
|
|
|
while (!skb_queue_empty(&list)) {
|
|
skb = __skb_dequeue(&list);
|
|
|
|
/* Fixup the mark to support VTI. */
|
|
skb_mark = skb->mark;
|
|
skb->mark = pol->mark.v;
|
|
xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family);
|
|
skb->mark = skb_mark;
|
|
|
|
dst_hold(xfrm_dst_path(skb_dst(skb)));
|
|
dst = xfrm_lookup(net, xfrm_dst_path(skb_dst(skb)), &fl, skb->sk, 0);
|
|
if (IS_ERR(dst)) {
|
|
kfree_skb(skb);
|
|
continue;
|
|
}
|
|
|
|
nf_reset_ct(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_XFRM_QUEUE;
|
|
dst1->lastuse = jiffies;
|
|
|
|
dst1->input = dst_discard;
|
|
dst1->output = xdst_queue_output;
|
|
|
|
dst_hold(dst);
|
|
xfrm_dst_set_child(xdst, dst);
|
|
xdst->path = dst;
|
|
|
|
xfrm_init_path((struct xfrm_dst *)dst1, dst, 0);
|
|
|
|
err = -ENODEV;
|
|
dev = dst->dev;
|
|
if (!dev)
|
|
goto free_dst;
|
|
|
|
err = xfrm_fill_dst(xdst, dev, fl);
|
|
if (err)
|
|
goto free_dst;
|
|
|
|
out:
|
|
return xdst;
|
|
|
|
free_dst:
|
|
dst_release(dst1);
|
|
xdst = ERR_PTR(err);
|
|
goto out;
|
|
}
|
|
|
|
static struct xfrm_dst *xfrm_bundle_lookup(struct net *net,
|
|
const struct flowi *fl,
|
|
u16 family, u8 dir,
|
|
struct xfrm_flo *xflo, u32 if_id)
|
|
{
|
|
struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
|
|
int num_pols = 0, num_xfrms = 0, err;
|
|
struct xfrm_dst *xdst;
|
|
|
|
/* Resolve policies to use if we couldn't get them from
|
|
* previous cache entry */
|
|
num_pols = 1;
|
|
pols[0] = xfrm_policy_lookup(net, fl, family, dir, if_id);
|
|
err = xfrm_expand_policies(fl, family, pols,
|
|
&num_pols, &num_xfrms);
|
|
if (err < 0)
|
|
goto inc_error;
|
|
if (num_pols == 0)
|
|
return NULL;
|
|
if (num_xfrms <= 0)
|
|
goto make_dummy_bundle;
|
|
|
|
xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family,
|
|
xflo->dst_orig);
|
|
if (IS_ERR(xdst)) {
|
|
err = PTR_ERR(xdst);
|
|
if (err == -EREMOTE) {
|
|
xfrm_pols_put(pols, num_pols);
|
|
return NULL;
|
|
}
|
|
|
|
if (err != -EAGAIN)
|
|
goto error;
|
|
goto make_dummy_bundle;
|
|
} else if (xdst == NULL) {
|
|
num_xfrms = 0;
|
|
goto make_dummy_bundle;
|
|
}
|
|
|
|
return xdst;
|
|
|
|
make_dummy_bundle:
|
|
/* We found policies, but there's no bundles to instantiate:
|
|
* either because the policy blocks, has no transformations or
|
|
* we could not build template (no xfrm_states).*/
|
|
xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family);
|
|
if (IS_ERR(xdst)) {
|
|
xfrm_pols_put(pols, num_pols);
|
|
return ERR_CAST(xdst);
|
|
}
|
|
xdst->num_pols = num_pols;
|
|
xdst->num_xfrms = num_xfrms;
|
|
memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
|
|
|
|
return xdst;
|
|
|
|
inc_error:
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
|
|
error:
|
|
xfrm_pols_put(pols, num_pols);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static struct dst_entry *make_blackhole(struct net *net, u16 family,
|
|
struct dst_entry *dst_orig)
|
|
{
|
|
const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
|
|
struct dst_entry *ret;
|
|
|
|
if (!afinfo) {
|
|
dst_release(dst_orig);
|
|
return ERR_PTR(-EINVAL);
|
|
} else {
|
|
ret = afinfo->blackhole_route(net, dst_orig);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Finds/creates a bundle for given flow and if_id
|
|
*
|
|
* At the moment we eat a raw IP route. Mostly to speed up lookups
|
|
* on interfaces with disabled IPsec.
|
|
*
|
|
* xfrm_lookup uses an if_id of 0 by default, and is provided for
|
|
* compatibility
|
|
*/
|
|
struct dst_entry *xfrm_lookup_with_ifid(struct net *net,
|
|
struct dst_entry *dst_orig,
|
|
const struct flowi *fl,
|
|
const struct sock *sk,
|
|
int flags, u32 if_id)
|
|
{
|
|
struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
|
|
struct xfrm_dst *xdst;
|
|
struct dst_entry *dst, *route;
|
|
u16 family = dst_orig->ops->family;
|
|
u8 dir = XFRM_POLICY_OUT;
|
|
int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
|
|
|
|
dst = NULL;
|
|
xdst = NULL;
|
|
route = NULL;
|
|
|
|
sk = sk_const_to_full_sk(sk);
|
|
if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
|
|
num_pols = 1;
|
|
pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl, family,
|
|
if_id);
|
|
err = xfrm_expand_policies(fl, family, pols,
|
|
&num_pols, &num_xfrms);
|
|
if (err < 0)
|
|
goto dropdst;
|
|
|
|
if (num_pols) {
|
|
if (num_xfrms <= 0) {
|
|
drop_pols = num_pols;
|
|
goto no_transform;
|
|
}
|
|
|
|
xdst = xfrm_resolve_and_create_bundle(
|
|
pols, num_pols, fl,
|
|
family, dst_orig);
|
|
|
|
if (IS_ERR(xdst)) {
|
|
xfrm_pols_put(pols, num_pols);
|
|
err = PTR_ERR(xdst);
|
|
if (err == -EREMOTE)
|
|
goto nopol;
|
|
|
|
goto dropdst;
|
|
} else if (xdst == NULL) {
|
|
num_xfrms = 0;
|
|
drop_pols = num_pols;
|
|
goto no_transform;
|
|
}
|
|
|
|
route = xdst->route;
|
|
}
|
|
}
|
|
|
|
if (xdst == NULL) {
|
|
struct xfrm_flo xflo;
|
|
|
|
xflo.dst_orig = dst_orig;
|
|
xflo.flags = flags;
|
|
|
|
/* To accelerate a bit... */
|
|
if (!if_id && ((dst_orig->flags & DST_NOXFRM) ||
|
|
!net->xfrm.policy_count[XFRM_POLICY_OUT]))
|
|
goto nopol;
|
|
|
|
xdst = xfrm_bundle_lookup(net, fl, family, dir, &xflo, if_id);
|
|
if (xdst == NULL)
|
|
goto nopol;
|
|
if (IS_ERR(xdst)) {
|
|
err = PTR_ERR(xdst);
|
|
goto dropdst;
|
|
}
|
|
|
|
num_pols = xdst->num_pols;
|
|
num_xfrms = xdst->num_xfrms;
|
|
memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols);
|
|
route = xdst->route;
|
|
}
|
|
|
|
dst = &xdst->u.dst;
|
|
if (route == NULL && num_xfrms > 0) {
|
|
/* The only case when xfrm_bundle_lookup() returns a
|
|
* bundle with null route, is when the template could
|
|
* not be resolved. It means policies are there, but
|
|
* bundle could not be created, since we don't yet
|
|
* have the xfrm_state's. We need to wait for KM to
|
|
* negotiate new SA's or bail out with error.*/
|
|
if (net->xfrm.sysctl_larval_drop) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
|
|
err = -EREMOTE;
|
|
goto error;
|
|
}
|
|
|
|
err = -EAGAIN;
|
|
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
|
|
goto error;
|
|
}
|
|
|
|
no_transform:
|
|
if (num_pols == 0)
|
|
goto nopol;
|
|
|
|
if ((flags & XFRM_LOOKUP_ICMP) &&
|
|
!(pols[0]->flags & XFRM_POLICY_ICMP)) {
|
|
err = -ENOENT;
|
|
goto error;
|
|
}
|
|
|
|
for (i = 0; i < num_pols; i++)
|
|
pols[i]->curlft.use_time = ktime_get_real_seconds();
|
|
|
|
if (num_xfrms < 0) {
|
|
/* Prohibit the flow */
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
|
|
err = -EPERM;
|
|
goto error;
|
|
} else if (num_xfrms > 0) {
|
|
/* Flow transformed */
|
|
dst_release(dst_orig);
|
|
} else {
|
|
/* Flow passes untransformed */
|
|
dst_release(dst);
|
|
dst = dst_orig;
|
|
}
|
|
ok:
|
|
xfrm_pols_put(pols, drop_pols);
|
|
if (dst && dst->xfrm &&
|
|
dst->xfrm->props.mode == XFRM_MODE_TUNNEL)
|
|
dst->flags |= DST_XFRM_TUNNEL;
|
|
return dst;
|
|
|
|
nopol:
|
|
if ((!dst_orig->dev || !(dst_orig->dev->flags & IFF_LOOPBACK)) &&
|
|
net->xfrm.policy_default[dir] == XFRM_USERPOLICY_BLOCK) {
|
|
err = -EPERM;
|
|
goto error;
|
|
}
|
|
if (!(flags & XFRM_LOOKUP_ICMP)) {
|
|
dst = dst_orig;
|
|
goto ok;
|
|
}
|
|
err = -ENOENT;
|
|
error:
|
|
dst_release(dst);
|
|
dropdst:
|
|
if (!(flags & XFRM_LOOKUP_KEEP_DST_REF))
|
|
dst_release(dst_orig);
|
|
xfrm_pols_put(pols, drop_pols);
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL(xfrm_lookup_with_ifid);
|
|
|
|
/* Main function: finds/creates a bundle for given flow.
|
|
*
|
|
* At the moment we eat a raw IP route. Mostly to speed up lookups
|
|
* on interfaces with disabled IPsec.
|
|
*/
|
|
struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
|
|
const struct flowi *fl, const struct sock *sk,
|
|
int flags)
|
|
{
|
|
return xfrm_lookup_with_ifid(net, dst_orig, fl, sk, flags, 0);
|
|
}
|
|
EXPORT_SYMBOL(xfrm_lookup);
|
|
|
|
/* Callers of xfrm_lookup_route() must ensure a call to dst_output().
|
|
* Otherwise we may send out blackholed packets.
|
|
*/
|
|
struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
|
|
const struct flowi *fl,
|
|
const struct sock *sk, int flags)
|
|
{
|
|
struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk,
|
|
flags | XFRM_LOOKUP_QUEUE |
|
|
XFRM_LOOKUP_KEEP_DST_REF);
|
|
|
|
if (PTR_ERR(dst) == -EREMOTE)
|
|
return make_blackhole(net, dst_orig->ops->family, dst_orig);
|
|
|
|
if (IS_ERR(dst))
|
|
dst_release(dst_orig);
|
|
|
|
return dst;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_lookup_route);
|
|
|
|
static inline int
|
|
xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
|
|
{
|
|
struct sec_path *sp = skb_sec_path(skb);
|
|
struct xfrm_state *x;
|
|
|
|
if (!sp || idx < 0 || idx >= sp->len)
|
|
return 0;
|
|
x = 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, u32 if_id)
|
|
{
|
|
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)) &&
|
|
(if_id == 0 || if_id == x->if_id);
|
|
}
|
|
|
|
/*
|
|
* 0 or more than 0 is returned when validation is succeeded (either bypass
|
|
* because of optional transport mode, or next index of the matched 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, u32 if_id)
|
|
{
|
|
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, if_id))
|
|
return ++idx;
|
|
if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
|
|
if (idx < sp->verified_cnt) {
|
|
/* Secpath entry previously verified, consider optional and
|
|
* continue searching
|
|
*/
|
|
continue;
|
|
}
|
|
|
|
if (start == -1)
|
|
start = -2-idx;
|
|
break;
|
|
}
|
|
}
|
|
return start;
|
|
}
|
|
|
|
static void
|
|
decode_session4(struct sk_buff *skb, struct flowi *fl, bool reverse)
|
|
{
|
|
const struct iphdr *iph = ip_hdr(skb);
|
|
int ihl = iph->ihl;
|
|
u8 *xprth = skb_network_header(skb) + ihl * 4;
|
|
struct flowi4 *fl4 = &fl->u.ip4;
|
|
int oif = 0;
|
|
|
|
if (skb_dst(skb) && skb_dst(skb)->dev)
|
|
oif = skb_dst(skb)->dev->ifindex;
|
|
|
|
memset(fl4, 0, sizeof(struct flowi4));
|
|
fl4->flowi4_mark = skb->mark;
|
|
fl4->flowi4_oif = reverse ? skb->skb_iif : oif;
|
|
|
|
fl4->flowi4_proto = iph->protocol;
|
|
fl4->daddr = reverse ? iph->saddr : iph->daddr;
|
|
fl4->saddr = reverse ? iph->daddr : iph->saddr;
|
|
fl4->flowi4_tos = iph->tos & ~INET_ECN_MASK;
|
|
|
|
if (!ip_is_fragment(iph)) {
|
|
switch (iph->protocol) {
|
|
case IPPROTO_UDP:
|
|
case IPPROTO_UDPLITE:
|
|
case IPPROTO_TCP:
|
|
case IPPROTO_SCTP:
|
|
case IPPROTO_DCCP:
|
|
if (xprth + 4 < skb->data ||
|
|
pskb_may_pull(skb, xprth + 4 - skb->data)) {
|
|
__be16 *ports;
|
|
|
|
xprth = skb_network_header(skb) + ihl * 4;
|
|
ports = (__be16 *)xprth;
|
|
|
|
fl4->fl4_sport = ports[!!reverse];
|
|
fl4->fl4_dport = ports[!reverse];
|
|
}
|
|
break;
|
|
case IPPROTO_ICMP:
|
|
if (xprth + 2 < skb->data ||
|
|
pskb_may_pull(skb, xprth + 2 - skb->data)) {
|
|
u8 *icmp;
|
|
|
|
xprth = skb_network_header(skb) + ihl * 4;
|
|
icmp = xprth;
|
|
|
|
fl4->fl4_icmp_type = icmp[0];
|
|
fl4->fl4_icmp_code = icmp[1];
|
|
}
|
|
break;
|
|
case IPPROTO_GRE:
|
|
if (xprth + 12 < skb->data ||
|
|
pskb_may_pull(skb, xprth + 12 - skb->data)) {
|
|
__be16 *greflags;
|
|
__be32 *gre_hdr;
|
|
|
|
xprth = skb_network_header(skb) + ihl * 4;
|
|
greflags = (__be16 *)xprth;
|
|
gre_hdr = (__be32 *)xprth;
|
|
|
|
if (greflags[0] & GRE_KEY) {
|
|
if (greflags[0] & GRE_CSUM)
|
|
gre_hdr++;
|
|
fl4->fl4_gre_key = gre_hdr[1];
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static void
|
|
decode_session6(struct sk_buff *skb, struct flowi *fl, bool reverse)
|
|
{
|
|
struct flowi6 *fl6 = &fl->u.ip6;
|
|
int onlyproto = 0;
|
|
const struct ipv6hdr *hdr = ipv6_hdr(skb);
|
|
u32 offset = sizeof(*hdr);
|
|
struct ipv6_opt_hdr *exthdr;
|
|
const unsigned char *nh = skb_network_header(skb);
|
|
u16 nhoff = IP6CB(skb)->nhoff;
|
|
int oif = 0;
|
|
u8 nexthdr;
|
|
|
|
if (!nhoff)
|
|
nhoff = offsetof(struct ipv6hdr, nexthdr);
|
|
|
|
nexthdr = nh[nhoff];
|
|
|
|
if (skb_dst(skb) && skb_dst(skb)->dev)
|
|
oif = skb_dst(skb)->dev->ifindex;
|
|
|
|
memset(fl6, 0, sizeof(struct flowi6));
|
|
fl6->flowi6_mark = skb->mark;
|
|
fl6->flowi6_oif = reverse ? skb->skb_iif : oif;
|
|
|
|
fl6->daddr = reverse ? hdr->saddr : hdr->daddr;
|
|
fl6->saddr = reverse ? hdr->daddr : hdr->saddr;
|
|
|
|
while (nh + offset + sizeof(*exthdr) < skb->data ||
|
|
pskb_may_pull(skb, nh + offset + sizeof(*exthdr) - skb->data)) {
|
|
nh = skb_network_header(skb);
|
|
exthdr = (struct ipv6_opt_hdr *)(nh + offset);
|
|
|
|
switch (nexthdr) {
|
|
case NEXTHDR_FRAGMENT:
|
|
onlyproto = 1;
|
|
fallthrough;
|
|
case NEXTHDR_ROUTING:
|
|
case NEXTHDR_HOP:
|
|
case NEXTHDR_DEST:
|
|
offset += ipv6_optlen(exthdr);
|
|
nexthdr = exthdr->nexthdr;
|
|
break;
|
|
case IPPROTO_UDP:
|
|
case IPPROTO_UDPLITE:
|
|
case IPPROTO_TCP:
|
|
case IPPROTO_SCTP:
|
|
case IPPROTO_DCCP:
|
|
if (!onlyproto && (nh + offset + 4 < skb->data ||
|
|
pskb_may_pull(skb, nh + offset + 4 - skb->data))) {
|
|
__be16 *ports;
|
|
|
|
nh = skb_network_header(skb);
|
|
ports = (__be16 *)(nh + offset);
|
|
fl6->fl6_sport = ports[!!reverse];
|
|
fl6->fl6_dport = ports[!reverse];
|
|
}
|
|
fl6->flowi6_proto = nexthdr;
|
|
return;
|
|
case IPPROTO_ICMPV6:
|
|
if (!onlyproto && (nh + offset + 2 < skb->data ||
|
|
pskb_may_pull(skb, nh + offset + 2 - skb->data))) {
|
|
u8 *icmp;
|
|
|
|
nh = skb_network_header(skb);
|
|
icmp = (u8 *)(nh + offset);
|
|
fl6->fl6_icmp_type = icmp[0];
|
|
fl6->fl6_icmp_code = icmp[1];
|
|
}
|
|
fl6->flowi6_proto = nexthdr;
|
|
return;
|
|
case IPPROTO_GRE:
|
|
if (!onlyproto &&
|
|
(nh + offset + 12 < skb->data ||
|
|
pskb_may_pull(skb, nh + offset + 12 - skb->data))) {
|
|
struct gre_base_hdr *gre_hdr;
|
|
__be32 *gre_key;
|
|
|
|
nh = skb_network_header(skb);
|
|
gre_hdr = (struct gre_base_hdr *)(nh + offset);
|
|
gre_key = (__be32 *)(gre_hdr + 1);
|
|
|
|
if (gre_hdr->flags & GRE_KEY) {
|
|
if (gre_hdr->flags & GRE_CSUM)
|
|
gre_key++;
|
|
fl6->fl6_gre_key = *gre_key;
|
|
}
|
|
}
|
|
fl6->flowi6_proto = nexthdr;
|
|
return;
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6_MIP6)
|
|
case IPPROTO_MH:
|
|
offset += ipv6_optlen(exthdr);
|
|
if (!onlyproto && (nh + offset + 3 < skb->data ||
|
|
pskb_may_pull(skb, nh + offset + 3 - skb->data))) {
|
|
struct ip6_mh *mh;
|
|
|
|
nh = skb_network_header(skb);
|
|
mh = (struct ip6_mh *)(nh + offset);
|
|
fl6->fl6_mh_type = mh->ip6mh_type;
|
|
}
|
|
fl6->flowi6_proto = nexthdr;
|
|
return;
|
|
#endif
|
|
default:
|
|
fl6->flowi6_proto = nexthdr;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
|
|
unsigned int family, int reverse)
|
|
{
|
|
switch (family) {
|
|
case AF_INET:
|
|
decode_session4(skb, fl, reverse);
|
|
break;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case AF_INET6:
|
|
decode_session6(skb, fl, reverse);
|
|
break;
|
|
#endif
|
|
default:
|
|
return -EAFNOSUPPORT;
|
|
}
|
|
|
|
return security_xfrm_decode_session(skb, &fl->flowi_secid);
|
|
}
|
|
EXPORT_SYMBOL(__xfrm_decode_session);
|
|
|
|
static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
|
|
{
|
|
for (; k < sp->len; k++) {
|
|
if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
|
|
*idxp = k;
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
|
|
unsigned short family)
|
|
{
|
|
struct net *net = dev_net(skb->dev);
|
|
struct xfrm_policy *pol;
|
|
struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
|
|
int npols = 0;
|
|
int xfrm_nr;
|
|
int pi;
|
|
int reverse;
|
|
struct flowi fl;
|
|
int xerr_idx = -1;
|
|
const struct xfrm_if_cb *ifcb;
|
|
struct sec_path *sp;
|
|
u32 if_id = 0;
|
|
|
|
rcu_read_lock();
|
|
ifcb = xfrm_if_get_cb();
|
|
|
|
if (ifcb) {
|
|
struct xfrm_if_decode_session_result r;
|
|
|
|
if (ifcb->decode_session(skb, family, &r)) {
|
|
if_id = r.if_id;
|
|
net = r.net;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
reverse = dir & ~XFRM_POLICY_MASK;
|
|
dir &= XFRM_POLICY_MASK;
|
|
|
|
if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
|
|
return 0;
|
|
}
|
|
|
|
nf_nat_decode_session(skb, &fl, family);
|
|
|
|
/* First, check used SA against their selectors. */
|
|
sp = skb_sec_path(skb);
|
|
if (sp) {
|
|
int i;
|
|
|
|
for (i = sp->len - 1; i >= 0; i--) {
|
|
struct xfrm_state *x = sp->xvec[i];
|
|
if (!xfrm_selector_match(&x->sel, &fl, family)) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
pol = NULL;
|
|
sk = sk_to_full_sk(sk);
|
|
if (sk && sk->sk_policy[dir]) {
|
|
pol = xfrm_sk_policy_lookup(sk, dir, &fl, family, if_id);
|
|
if (IS_ERR(pol)) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (!pol)
|
|
pol = xfrm_policy_lookup(net, &fl, family, dir, if_id);
|
|
|
|
if (IS_ERR(pol)) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
|
|
return 0;
|
|
}
|
|
|
|
if (!pol) {
|
|
if (net->xfrm.policy_default[dir] == XFRM_USERPOLICY_BLOCK) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
|
|
return 0;
|
|
}
|
|
|
|
if (sp && secpath_has_nontransport(sp, 0, &xerr_idx)) {
|
|
xfrm_secpath_reject(xerr_idx, skb, &fl);
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/* This lockless write can happen from different cpus. */
|
|
WRITE_ONCE(pol->curlft.use_time, ktime_get_real_seconds());
|
|
|
|
pols[0] = pol;
|
|
npols++;
|
|
#ifdef CONFIG_XFRM_SUB_POLICY
|
|
if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
|
|
pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
|
|
&fl, family,
|
|
XFRM_POLICY_IN, if_id);
|
|
if (pols[1]) {
|
|
if (IS_ERR(pols[1])) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
|
|
xfrm_pol_put(pols[0]);
|
|
return 0;
|
|
}
|
|
/* This write can happen from different cpus. */
|
|
WRITE_ONCE(pols[1]->curlft.use_time,
|
|
ktime_get_real_seconds());
|
|
npols++;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (pol->action == XFRM_POLICY_ALLOW) {
|
|
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;
|
|
|
|
sp = skb_sec_path(skb);
|
|
if (!sp)
|
|
sp = &dummy;
|
|
|
|
for (pi = 0; pi < npols; pi++) {
|
|
if (pols[pi] != pol &&
|
|
pols[pi]->action != XFRM_POLICY_ALLOW) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
|
|
goto reject;
|
|
}
|
|
if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
|
|
goto reject_error;
|
|
}
|
|
for (i = 0; i < pols[pi]->xfrm_nr; i++)
|
|
tpp[ti++] = &pols[pi]->xfrm_vec[i];
|
|
}
|
|
xfrm_nr = ti;
|
|
|
|
if (npols > 1) {
|
|
xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
|
|
tpp = stp;
|
|
}
|
|
|
|
/* For each tunnel xfrm, find the first matching tmpl.
|
|
* For each tmpl before that, find corresponding xfrm.
|
|
* Order is _important_. Later we will implement
|
|
* some barriers, but at the moment barriers
|
|
* are implied between each two transformations.
|
|
* Upon success, marks secpath entries as having been
|
|
* verified to allow them to be skipped in future policy
|
|
* checks (e.g. nested tunnels).
|
|
*/
|
|
for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
|
|
k = xfrm_policy_ok(tpp[i], sp, k, family, if_id);
|
|
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);
|
|
sp->verified_cnt = k;
|
|
|
|
return 1;
|
|
}
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
|
|
|
|
reject:
|
|
xfrm_secpath_reject(xerr_idx, skb, &fl);
|
|
reject_error:
|
|
xfrm_pols_put(pols, npols);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(__xfrm_policy_check);
|
|
|
|
int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
|
|
{
|
|
struct net *net = dev_net(skb->dev);
|
|
struct flowi fl;
|
|
struct dst_entry *dst;
|
|
int res = 1;
|
|
|
|
if (xfrm_decode_session(skb, &fl, family) < 0) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
|
|
return 0;
|
|
}
|
|
|
|
skb_dst_force(skb);
|
|
if (!skb_dst(skb)) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
|
|
return 0;
|
|
}
|
|
|
|
dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE);
|
|
if (IS_ERR(dst)) {
|
|
res = 0;
|
|
dst = NULL;
|
|
}
|
|
skb_dst_set(skb, dst);
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL(__xfrm_route_forward);
|
|
|
|
/* Optimize later using cookies and generation ids. */
|
|
|
|
static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
|
|
{
|
|
/* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
|
|
* to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
|
|
* get validated by dst_ops->check on every use. We do this
|
|
* because when a normal route referenced by an XFRM dst is
|
|
* obsoleted we do not go looking around for all parent
|
|
* referencing XFRM dsts so that we can invalidate them. It
|
|
* is just too much work. Instead we make the checks here on
|
|
* every use. For example:
|
|
*
|
|
* XFRM dst A --> IPv4 dst X
|
|
*
|
|
* X is the "xdst->route" of A (X is also the "dst->path" of A
|
|
* in this example). If X is marked obsolete, "A" will not
|
|
* notice. That's what we are validating here via the
|
|
* stale_bundle() check.
|
|
*
|
|
* When a dst is removed from the fib tree, DST_OBSOLETE_DEAD will
|
|
* be marked on it.
|
|
* This will force stale_bundle() to fail on any xdst bundle with
|
|
* this dst linked in it.
|
|
*/
|
|
if (dst->obsolete < 0 && !stale_bundle(dst))
|
|
return dst;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int stale_bundle(struct dst_entry *dst)
|
|
{
|
|
return !xfrm_bundle_ok((struct xfrm_dst *)dst);
|
|
}
|
|
|
|
void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
|
|
{
|
|
while ((dst = xfrm_dst_child(dst)) && dst->xfrm && dst->dev == dev) {
|
|
dst->dev = blackhole_netdev;
|
|
dev_hold(dst->dev);
|
|
dev_put(dev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(xfrm_dst_ifdown);
|
|
|
|
static void xfrm_link_failure(struct sk_buff *skb)
|
|
{
|
|
/* Impossible. Such dst must be popped before reaches point of failure. */
|
|
}
|
|
|
|
static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
|
|
{
|
|
if (dst) {
|
|
if (dst->obsolete) {
|
|
dst_release(dst);
|
|
dst = NULL;
|
|
}
|
|
}
|
|
return dst;
|
|
}
|
|
|
|
static void xfrm_init_pmtu(struct xfrm_dst **bundle, int nr)
|
|
{
|
|
while (nr--) {
|
|
struct xfrm_dst *xdst = bundle[nr];
|
|
u32 pmtu, route_mtu_cached;
|
|
struct dst_entry *dst;
|
|
|
|
dst = &xdst->u.dst;
|
|
pmtu = dst_mtu(xfrm_dst_child(dst));
|
|
xdst->child_mtu_cached = pmtu;
|
|
|
|
pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
|
|
|
|
route_mtu_cached = dst_mtu(xdst->route);
|
|
xdst->route_mtu_cached = route_mtu_cached;
|
|
|
|
if (pmtu > route_mtu_cached)
|
|
pmtu = route_mtu_cached;
|
|
|
|
dst_metric_set(dst, RTAX_MTU, pmtu);
|
|
}
|
|
}
|
|
|
|
/* Check that the bundle accepts the flow and its components are
|
|
* still valid.
|
|
*/
|
|
|
|
static int xfrm_bundle_ok(struct xfrm_dst *first)
|
|
{
|
|
struct xfrm_dst *bundle[XFRM_MAX_DEPTH];
|
|
struct dst_entry *dst = &first->u.dst;
|
|
struct xfrm_dst *xdst;
|
|
int start_from, nr;
|
|
u32 mtu;
|
|
|
|
if (!dst_check(xfrm_dst_path(dst), ((struct xfrm_dst *)dst)->path_cookie) ||
|
|
(dst->dev && !netif_running(dst->dev)))
|
|
return 0;
|
|
|
|
if (dst->flags & DST_XFRM_QUEUE)
|
|
return 1;
|
|
|
|
start_from = nr = 0;
|
|
do {
|
|
struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
|
|
|
|
if (dst->xfrm->km.state != XFRM_STATE_VALID)
|
|
return 0;
|
|
if (xdst->xfrm_genid != dst->xfrm->genid)
|
|
return 0;
|
|
if (xdst->num_pols > 0 &&
|
|
xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
|
|
return 0;
|
|
|
|
bundle[nr++] = xdst;
|
|
|
|
mtu = dst_mtu(xfrm_dst_child(dst));
|
|
if (xdst->child_mtu_cached != mtu) {
|
|
start_from = nr;
|
|
xdst->child_mtu_cached = mtu;
|
|
}
|
|
|
|
if (!dst_check(xdst->route, xdst->route_cookie))
|
|
return 0;
|
|
mtu = dst_mtu(xdst->route);
|
|
if (xdst->route_mtu_cached != mtu) {
|
|
start_from = nr;
|
|
xdst->route_mtu_cached = mtu;
|
|
}
|
|
|
|
dst = xfrm_dst_child(dst);
|
|
} while (dst->xfrm);
|
|
|
|
if (likely(!start_from))
|
|
return 1;
|
|
|
|
xdst = bundle[start_from - 1];
|
|
mtu = xdst->child_mtu_cached;
|
|
while (start_from--) {
|
|
dst = &xdst->u.dst;
|
|
|
|
mtu = xfrm_state_mtu(dst->xfrm, mtu);
|
|
if (mtu > xdst->route_mtu_cached)
|
|
mtu = xdst->route_mtu_cached;
|
|
dst_metric_set(dst, RTAX_MTU, mtu);
|
|
if (!start_from)
|
|
break;
|
|
|
|
xdst = bundle[start_from - 1];
|
|
xdst->child_mtu_cached = mtu;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
|
|
{
|
|
return dst_metric_advmss(xfrm_dst_path(dst));
|
|
}
|
|
|
|
static unsigned int xfrm_mtu(const struct dst_entry *dst)
|
|
{
|
|
unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
|
|
|
|
return mtu ? : dst_mtu(xfrm_dst_path(dst));
|
|
}
|
|
|
|
static const void *xfrm_get_dst_nexthop(const struct dst_entry *dst,
|
|
const void *daddr)
|
|
{
|
|
while (dst->xfrm) {
|
|
const struct xfrm_state *xfrm = dst->xfrm;
|
|
|
|
dst = xfrm_dst_child(dst);
|
|
|
|
if (xfrm->props.mode == XFRM_MODE_TRANSPORT)
|
|
continue;
|
|
if (xfrm->type->flags & XFRM_TYPE_REMOTE_COADDR)
|
|
daddr = xfrm->coaddr;
|
|
else if (!(xfrm->type->flags & XFRM_TYPE_LOCAL_COADDR))
|
|
daddr = &xfrm->id.daddr;
|
|
}
|
|
return daddr;
|
|
}
|
|
|
|
static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
|
|
struct sk_buff *skb,
|
|
const void *daddr)
|
|
{
|
|
const struct dst_entry *path = xfrm_dst_path(dst);
|
|
|
|
if (!skb)
|
|
daddr = xfrm_get_dst_nexthop(dst, daddr);
|
|
return path->ops->neigh_lookup(path, skb, daddr);
|
|
}
|
|
|
|
static void xfrm_confirm_neigh(const struct dst_entry *dst, const void *daddr)
|
|
{
|
|
const struct dst_entry *path = xfrm_dst_path(dst);
|
|
|
|
daddr = xfrm_get_dst_nexthop(dst, daddr);
|
|
path->ops->confirm_neigh(path, daddr);
|
|
}
|
|
|
|
int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family)
|
|
{
|
|
int err = 0;
|
|
|
|
if (WARN_ON(family >= ARRAY_SIZE(xfrm_policy_afinfo)))
|
|
return -EAFNOSUPPORT;
|
|
|
|
spin_lock(&xfrm_policy_afinfo_lock);
|
|
if (unlikely(xfrm_policy_afinfo[family] != NULL))
|
|
err = -EEXIST;
|
|
else {
|
|
struct dst_ops *dst_ops = afinfo->dst_ops;
|
|
if (likely(dst_ops->kmem_cachep == NULL))
|
|
dst_ops->kmem_cachep = xfrm_dst_cache;
|
|
if (likely(dst_ops->check == NULL))
|
|
dst_ops->check = xfrm_dst_check;
|
|
if (likely(dst_ops->default_advmss == NULL))
|
|
dst_ops->default_advmss = xfrm_default_advmss;
|
|
if (likely(dst_ops->mtu == NULL))
|
|
dst_ops->mtu = xfrm_mtu;
|
|
if (likely(dst_ops->negative_advice == NULL))
|
|
dst_ops->negative_advice = xfrm_negative_advice;
|
|
if (likely(dst_ops->link_failure == NULL))
|
|
dst_ops->link_failure = xfrm_link_failure;
|
|
if (likely(dst_ops->neigh_lookup == NULL))
|
|
dst_ops->neigh_lookup = xfrm_neigh_lookup;
|
|
if (likely(!dst_ops->confirm_neigh))
|
|
dst_ops->confirm_neigh = xfrm_confirm_neigh;
|
|
rcu_assign_pointer(xfrm_policy_afinfo[family], afinfo);
|
|
}
|
|
spin_unlock(&xfrm_policy_afinfo_lock);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_policy_register_afinfo);
|
|
|
|
void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo)
|
|
{
|
|
struct dst_ops *dst_ops = afinfo->dst_ops;
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(xfrm_policy_afinfo); i++) {
|
|
if (xfrm_policy_afinfo[i] != afinfo)
|
|
continue;
|
|
RCU_INIT_POINTER(xfrm_policy_afinfo[i], NULL);
|
|
break;
|
|
}
|
|
|
|
synchronize_rcu();
|
|
|
|
dst_ops->kmem_cachep = NULL;
|
|
dst_ops->check = NULL;
|
|
dst_ops->negative_advice = NULL;
|
|
dst_ops->link_failure = NULL;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
|
|
|
|
void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb)
|
|
{
|
|
spin_lock(&xfrm_if_cb_lock);
|
|
rcu_assign_pointer(xfrm_if_cb, ifcb);
|
|
spin_unlock(&xfrm_if_cb_lock);
|
|
}
|
|
EXPORT_SYMBOL(xfrm_if_register_cb);
|
|
|
|
void xfrm_if_unregister_cb(void)
|
|
{
|
|
RCU_INIT_POINTER(xfrm_if_cb, NULL);
|
|
synchronize_rcu();
|
|
}
|
|
EXPORT_SYMBOL(xfrm_if_unregister_cb);
|
|
|
|
#ifdef CONFIG_XFRM_STATISTICS
|
|
static int __net_init xfrm_statistics_init(struct net *net)
|
|
{
|
|
int rv;
|
|
net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib);
|
|
if (!net->mib.xfrm_statistics)
|
|
return -ENOMEM;
|
|
rv = xfrm_proc_init(net);
|
|
if (rv < 0)
|
|
free_percpu(net->mib.xfrm_statistics);
|
|
return rv;
|
|
}
|
|
|
|
static void xfrm_statistics_fini(struct net *net)
|
|
{
|
|
xfrm_proc_fini(net);
|
|
free_percpu(net->mib.xfrm_statistics);
|
|
}
|
|
#else
|
|
static int __net_init xfrm_statistics_init(struct net *net)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void xfrm_statistics_fini(struct net *net)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static int __net_init xfrm_policy_init(struct net *net)
|
|
{
|
|
unsigned int hmask, sz;
|
|
int dir, err;
|
|
|
|
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);
|
|
err = rhashtable_init(&xfrm_policy_inexact_table,
|
|
&xfrm_pol_inexact_params);
|
|
BUG_ON(err);
|
|
}
|
|
|
|
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_LIST_HEAD(&net->xfrm.inexact_bins);
|
|
INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
|
|
INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild);
|
|
return 0;
|
|
|
|
out_bydst:
|
|
for (dir--; dir >= 0; dir--) {
|
|
struct xfrm_policy_hash *htab;
|
|
|
|
htab = &net->xfrm.policy_bydst[dir];
|
|
xfrm_hash_free(htab->table, sz);
|
|
}
|
|
xfrm_hash_free(net->xfrm.policy_byidx, sz);
|
|
out_byidx:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void xfrm_policy_fini(struct net *net)
|
|
{
|
|
struct xfrm_pol_inexact_bin *b, *t;
|
|
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);
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_policy_lock);
|
|
list_for_each_entry_safe(b, t, &net->xfrm.inexact_bins, inexact_bins)
|
|
__xfrm_policy_inexact_prune_bin(b, true);
|
|
spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
|
|
}
|
|
|
|
static int __net_init xfrm_net_init(struct net *net)
|
|
{
|
|
int rv;
|
|
|
|
/* Initialize the per-net locks here */
|
|
spin_lock_init(&net->xfrm.xfrm_state_lock);
|
|
spin_lock_init(&net->xfrm.xfrm_policy_lock);
|
|
seqcount_spinlock_init(&net->xfrm.xfrm_policy_hash_generation, &net->xfrm.xfrm_policy_lock);
|
|
mutex_init(&net->xfrm.xfrm_cfg_mutex);
|
|
net->xfrm.policy_default[XFRM_POLICY_IN] = XFRM_USERPOLICY_ACCEPT;
|
|
net->xfrm.policy_default[XFRM_POLICY_FWD] = XFRM_USERPOLICY_ACCEPT;
|
|
net->xfrm.policy_default[XFRM_POLICY_OUT] = XFRM_USERPOLICY_ACCEPT;
|
|
|
|
rv = xfrm_statistics_init(net);
|
|
if (rv < 0)
|
|
goto out_statistics;
|
|
rv = xfrm_state_init(net);
|
|
if (rv < 0)
|
|
goto out_state;
|
|
rv = xfrm_policy_init(net);
|
|
if (rv < 0)
|
|
goto out_policy;
|
|
rv = xfrm_sysctl_init(net);
|
|
if (rv < 0)
|
|
goto out_sysctl;
|
|
|
|
return 0;
|
|
|
|
out_sysctl:
|
|
xfrm_policy_fini(net);
|
|
out_policy:
|
|
xfrm_state_fini(net);
|
|
out_state:
|
|
xfrm_statistics_fini(net);
|
|
out_statistics:
|
|
return rv;
|
|
}
|
|
|
|
static void __net_exit xfrm_net_exit(struct net *net)
|
|
{
|
|
xfrm_sysctl_fini(net);
|
|
xfrm_policy_fini(net);
|
|
xfrm_state_fini(net);
|
|
xfrm_statistics_fini(net);
|
|
}
|
|
|
|
static struct pernet_operations __net_initdata xfrm_net_ops = {
|
|
.init = xfrm_net_init,
|
|
.exit = xfrm_net_exit,
|
|
};
|
|
|
|
void __init xfrm_init(void)
|
|
{
|
|
register_pernet_subsys(&xfrm_net_ops);
|
|
xfrm_dev_init();
|
|
xfrm_input_init();
|
|
|
|
#ifdef CONFIG_XFRM_ESPINTCP
|
|
espintcp_init();
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_AUDITSYSCALL
|
|
static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
|
|
struct audit_buffer *audit_buf)
|
|
{
|
|
struct xfrm_sec_ctx *ctx = xp->security;
|
|
struct xfrm_selector *sel = &xp->selector;
|
|
|
|
if (ctx)
|
|
audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
|
|
ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
|
|
|
|
switch (sel->family) {
|
|
case AF_INET:
|
|
audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
|
|
if (sel->prefixlen_s != 32)
|
|
audit_log_format(audit_buf, " src_prefixlen=%d",
|
|
sel->prefixlen_s);
|
|
audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
|
|
if (sel->prefixlen_d != 32)
|
|
audit_log_format(audit_buf, " dst_prefixlen=%d",
|
|
sel->prefixlen_d);
|
|
break;
|
|
case AF_INET6:
|
|
audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
|
|
if (sel->prefixlen_s != 128)
|
|
audit_log_format(audit_buf, " src_prefixlen=%d",
|
|
sel->prefixlen_s);
|
|
audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
|
|
if (sel->prefixlen_d != 128)
|
|
audit_log_format(audit_buf, " dst_prefixlen=%d",
|
|
sel->prefixlen_d);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid)
|
|
{
|
|
struct audit_buffer *audit_buf;
|
|
|
|
audit_buf = xfrm_audit_start("SPD-add");
|
|
if (audit_buf == NULL)
|
|
return;
|
|
xfrm_audit_helper_usrinfo(task_valid, audit_buf);
|
|
audit_log_format(audit_buf, " res=%u", result);
|
|
xfrm_audit_common_policyinfo(xp, audit_buf);
|
|
audit_log_end(audit_buf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
|
|
|
|
void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
|
|
bool task_valid)
|
|
{
|
|
struct audit_buffer *audit_buf;
|
|
|
|
audit_buf = xfrm_audit_start("SPD-delete");
|
|
if (audit_buf == NULL)
|
|
return;
|
|
xfrm_audit_helper_usrinfo(task_valid, audit_buf);
|
|
audit_log_format(audit_buf, " res=%u", result);
|
|
xfrm_audit_common_policyinfo(xp, audit_buf);
|
|
audit_log_end(audit_buf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
|
|
#endif
|
|
|
|
#ifdef CONFIG_XFRM_MIGRATE
|
|
static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
|
|
const struct xfrm_selector *sel_tgt)
|
|
{
|
|
if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
|
|
if (sel_tgt->family == sel_cmp->family &&
|
|
xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr,
|
|
sel_cmp->family) &&
|
|
xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr,
|
|
sel_cmp->family) &&
|
|
sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
|
|
sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
|
|
return true;
|
|
}
|
|
} else {
|
|
if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel,
|
|
u8 dir, u8 type, struct net *net, u32 if_id)
|
|
{
|
|
struct xfrm_policy *pol, *ret = NULL;
|
|
struct hlist_head *chain;
|
|
u32 priority = ~0U;
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_policy_lock);
|
|
chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir);
|
|
hlist_for_each_entry(pol, chain, bydst) {
|
|
if ((if_id == 0 || pol->if_id == if_id) &&
|
|
xfrm_migrate_selector_match(sel, &pol->selector) &&
|
|
pol->type == type) {
|
|
ret = pol;
|
|
priority = ret->priority;
|
|
break;
|
|
}
|
|
}
|
|
chain = &net->xfrm.policy_inexact[dir];
|
|
hlist_for_each_entry(pol, chain, bydst_inexact_list) {
|
|
if ((pol->priority >= priority) && ret)
|
|
break;
|
|
|
|
if ((if_id == 0 || pol->if_id == if_id) &&
|
|
xfrm_migrate_selector_match(sel, &pol->selector) &&
|
|
pol->type == type) {
|
|
ret = pol;
|
|
break;
|
|
}
|
|
}
|
|
|
|
xfrm_pol_hold(ret);
|
|
|
|
spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
|
|
{
|
|
int match = 0;
|
|
|
|
if (t->mode == m->mode && t->id.proto == m->proto &&
|
|
(m->reqid == 0 || t->reqid == m->reqid)) {
|
|
switch (t->mode) {
|
|
case XFRM_MODE_TUNNEL:
|
|
case XFRM_MODE_BEET:
|
|
if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr,
|
|
m->old_family) &&
|
|
xfrm_addr_equal(&t->saddr, &m->old_saddr,
|
|
m->old_family)) {
|
|
match = 1;
|
|
}
|
|
break;
|
|
case XFRM_MODE_TRANSPORT:
|
|
/* in case of transport mode, template does not store
|
|
any IP addresses, hence we just compare mode and
|
|
protocol */
|
|
match = 1;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
return match;
|
|
}
|
|
|
|
/* update endpoint address(es) of template(s) */
|
|
static int xfrm_policy_migrate(struct xfrm_policy *pol,
|
|
struct xfrm_migrate *m, int num_migrate,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct xfrm_migrate *mp;
|
|
int i, j, n = 0;
|
|
|
|
write_lock_bh(&pol->lock);
|
|
if (unlikely(pol->walk.dead)) {
|
|
/* target policy has been deleted */
|
|
NL_SET_ERR_MSG(extack, "Target policy not found");
|
|
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,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
int i, j;
|
|
|
|
if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) {
|
|
NL_SET_ERR_MSG(extack, "Invalid number of SAs to migrate, must be 0 < num <= XFRM_MAX_DEPTH (6)");
|
|
return -EINVAL;
|
|
}
|
|
|
|
for (i = 0; i < num_migrate; i++) {
|
|
if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
|
|
xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) {
|
|
NL_SET_ERR_MSG(extack, "Addresses in the MIGRATE attribute's list cannot be null");
|
|
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) {
|
|
NL_SET_ERR_MSG(extack, "Entries in the MIGRATE attribute's list must be unique");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
|
|
struct xfrm_migrate *m, int num_migrate,
|
|
struct xfrm_kmaddress *k, struct net *net,
|
|
struct xfrm_encap_tmpl *encap, u32 if_id,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
int i, err, nx_cur = 0, nx_new = 0;
|
|
struct xfrm_policy *pol = NULL;
|
|
struct xfrm_state *x, *xc;
|
|
struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
|
|
struct xfrm_state *x_new[XFRM_MAX_DEPTH];
|
|
struct xfrm_migrate *mp;
|
|
|
|
/* Stage 0 - sanity checks */
|
|
err = xfrm_migrate_check(m, num_migrate, extack);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
if (dir >= XFRM_POLICY_MAX) {
|
|
NL_SET_ERR_MSG(extack, "Invalid policy direction");
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Stage 1 - find policy */
|
|
pol = xfrm_migrate_policy_find(sel, dir, type, net, if_id);
|
|
if (!pol) {
|
|
NL_SET_ERR_MSG(extack, "Target policy not found");
|
|
err = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
/* Stage 2 - find and update state(s) */
|
|
for (i = 0, mp = m; i < num_migrate; i++, mp++) {
|
|
if ((x = xfrm_migrate_state_find(mp, net, if_id))) {
|
|
x_cur[nx_cur] = x;
|
|
nx_cur++;
|
|
xc = xfrm_state_migrate(x, mp, encap);
|
|
if (xc) {
|
|
x_new[nx_new] = xc;
|
|
nx_new++;
|
|
} else {
|
|
err = -ENODATA;
|
|
goto restore_state;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Stage 3 - update policy */
|
|
err = xfrm_policy_migrate(pol, m, num_migrate, extack);
|
|
if (err < 0)
|
|
goto restore_state;
|
|
|
|
/* Stage 4 - delete old state(s) */
|
|
if (nx_cur) {
|
|
xfrm_states_put(x_cur, nx_cur);
|
|
xfrm_states_delete(x_cur, nx_cur);
|
|
}
|
|
|
|
/* Stage 5 - announce */
|
|
km_migrate(sel, dir, type, m, num_migrate, k, encap);
|
|
|
|
xfrm_pol_put(pol);
|
|
|
|
return 0;
|
|
out:
|
|
return err;
|
|
|
|
restore_state:
|
|
if (pol)
|
|
xfrm_pol_put(pol);
|
|
if (nx_cur)
|
|
xfrm_states_put(x_cur, nx_cur);
|
|
if (nx_new)
|
|
xfrm_states_delete(x_new, nx_new);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_migrate);
|
|
#endif
|