1144 lines
32 KiB
C
1144 lines
32 KiB
C
#ifndef _NET_XFRM_H
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#define _NET_XFRM_H
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#include <linux/compiler.h>
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#include <linux/in.h>
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#include <linux/xfrm.h>
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#include <linux/spinlock.h>
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#include <linux/list.h>
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#include <linux/skbuff.h>
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#include <linux/socket.h>
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#include <linux/pfkeyv2.h>
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#include <linux/ipsec.h>
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#include <linux/in6.h>
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#include <linux/mutex.h>
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#include <net/sock.h>
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#include <net/dst.h>
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#include <net/route.h>
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#include <net/ipv6.h>
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#include <net/ip6_fib.h>
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#define XFRM_PROTO_ESP 50
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#define XFRM_PROTO_AH 51
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#define XFRM_PROTO_COMP 108
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#define XFRM_PROTO_IPIP 4
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#define XFRM_PROTO_IPV6 41
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#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
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#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
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#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
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#define MODULE_ALIAS_XFRM_MODE(family, encap) \
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MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
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#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
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MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
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extern struct sock *xfrm_nl;
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extern u32 sysctl_xfrm_aevent_etime;
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extern u32 sysctl_xfrm_aevent_rseqth;
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extern struct mutex xfrm_cfg_mutex;
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/* Organization of SPD aka "XFRM rules"
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------------------------------------
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Basic objects:
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- policy rule, struct xfrm_policy (=SPD entry)
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- bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
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- instance of a transformer, struct xfrm_state (=SA)
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- template to clone xfrm_state, struct xfrm_tmpl
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SPD is plain linear list of xfrm_policy rules, ordered by priority.
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(To be compatible with existing pfkeyv2 implementations,
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many rules with priority of 0x7fffffff are allowed to exist and
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such rules are ordered in an unpredictable way, thanks to bsd folks.)
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Lookup is plain linear search until the first match with selector.
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If "action" is "block", then we prohibit the flow, otherwise:
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if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
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policy entry has list of up to XFRM_MAX_DEPTH transformations,
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described by templates xfrm_tmpl. Each template is resolved
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to a complete xfrm_state (see below) and we pack bundle of transformations
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to a dst_entry returned to requestor.
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dst -. xfrm .-> xfrm_state #1
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|---. child .-> dst -. xfrm .-> xfrm_state #2
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|---. child .-> dst -. xfrm .-> xfrm_state #3
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|---. child .-> NULL
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Bundles are cached at xrfm_policy struct (field ->bundles).
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Resolution of xrfm_tmpl
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-----------------------
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Template contains:
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1. ->mode Mode: transport or tunnel
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2. ->id.proto Protocol: AH/ESP/IPCOMP
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3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
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Q: allow to resolve security gateway?
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4. ->id.spi If not zero, static SPI.
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5. ->saddr Local tunnel endpoint, ignored for transport mode.
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6. ->algos List of allowed algos. Plain bitmask now.
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Q: ealgos, aalgos, calgos. What a mess...
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7. ->share Sharing mode.
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Q: how to implement private sharing mode? To add struct sock* to
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flow id?
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Having this template we search through SAD searching for entries
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with appropriate mode/proto/algo, permitted by selector.
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If no appropriate entry found, it is requested from key manager.
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PROBLEMS:
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Q: How to find all the bundles referring to a physical path for
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PMTU discovery? Seems, dst should contain list of all parents...
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and enter to infinite locking hierarchy disaster.
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No! It is easier, we will not search for them, let them find us.
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We add genid to each dst plus pointer to genid of raw IP route,
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pmtu disc will update pmtu on raw IP route and increase its genid.
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dst_check() will see this for top level and trigger resyncing
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metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
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*/
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/* Full description of state of transformer. */
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struct xfrm_state
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{
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/* Note: bydst is re-used during gc */
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struct hlist_node bydst;
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struct hlist_node bysrc;
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struct hlist_node byspi;
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atomic_t refcnt;
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spinlock_t lock;
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struct xfrm_id id;
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struct xfrm_selector sel;
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u32 genid;
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/* Key manger bits */
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struct {
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u8 state;
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u8 dying;
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u32 seq;
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} km;
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/* Parameters of this state. */
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struct {
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u32 reqid;
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u8 mode;
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u8 replay_window;
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u8 aalgo, ealgo, calgo;
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u8 flags;
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u16 family;
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xfrm_address_t saddr;
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int header_len;
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int trailer_len;
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} props;
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struct xfrm_lifetime_cfg lft;
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/* Data for transformer */
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struct xfrm_algo *aalg;
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struct xfrm_algo *ealg;
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struct xfrm_algo *calg;
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/* Data for encapsulator */
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struct xfrm_encap_tmpl *encap;
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/* Data for care-of address */
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xfrm_address_t *coaddr;
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/* IPComp needs an IPIP tunnel for handling uncompressed packets */
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struct xfrm_state *tunnel;
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/* If a tunnel, number of users + 1 */
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atomic_t tunnel_users;
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/* State for replay detection */
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struct xfrm_replay_state replay;
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/* Replay detection state at the time we sent the last notification */
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struct xfrm_replay_state preplay;
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/* internal flag that only holds state for delayed aevent at the
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* moment
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*/
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u32 xflags;
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/* Replay detection notification settings */
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u32 replay_maxage;
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u32 replay_maxdiff;
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/* Replay detection notification timer */
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struct timer_list rtimer;
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/* Statistics */
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struct xfrm_stats stats;
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struct xfrm_lifetime_cur curlft;
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struct timer_list timer;
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/* Last used time */
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u64 lastused;
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/* Reference to data common to all the instances of this
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* transformer. */
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struct xfrm_type *type;
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struct xfrm_mode *mode;
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/* Security context */
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struct xfrm_sec_ctx *security;
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/* Private data of this transformer, format is opaque,
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* interpreted by xfrm_type methods. */
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void *data;
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};
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/* xflags - make enum if more show up */
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#define XFRM_TIME_DEFER 1
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enum {
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XFRM_STATE_VOID,
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XFRM_STATE_ACQ,
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XFRM_STATE_VALID,
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XFRM_STATE_ERROR,
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XFRM_STATE_EXPIRED,
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XFRM_STATE_DEAD
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};
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/* callback structure passed from either netlink or pfkey */
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struct km_event
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{
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union {
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u32 hard;
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u32 proto;
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u32 byid;
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u32 aevent;
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u32 type;
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} data;
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u32 seq;
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u32 pid;
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u32 event;
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};
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struct xfrm_type;
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struct xfrm_dst;
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struct xfrm_policy_afinfo {
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unsigned short family;
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struct xfrm_type *type_map[IPPROTO_MAX];
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struct xfrm_mode *mode_map[XFRM_MODE_MAX];
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struct dst_ops *dst_ops;
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void (*garbage_collect)(void);
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int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
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int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
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struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
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int (*bundle_create)(struct xfrm_policy *policy,
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struct xfrm_state **xfrm,
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int nx,
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struct flowi *fl,
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struct dst_entry **dst_p);
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void (*decode_session)(struct sk_buff *skb,
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struct flowi *fl);
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};
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extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
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extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
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extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
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extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
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struct xfrm_tmpl;
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extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
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extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
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extern int __xfrm_state_delete(struct xfrm_state *x);
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struct xfrm_state_afinfo {
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unsigned short family;
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int (*init_flags)(struct xfrm_state *x);
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void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
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struct xfrm_tmpl *tmpl,
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xfrm_address_t *daddr, xfrm_address_t *saddr);
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int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
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int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
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int (*output)(struct sk_buff *skb);
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};
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extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
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extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
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extern struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family);
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extern void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
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extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
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struct xfrm_type
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{
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char *description;
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struct module *owner;
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__u8 proto;
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__u8 flags;
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#define XFRM_TYPE_NON_FRAGMENT 1
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int (*init_state)(struct xfrm_state *x);
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void (*destructor)(struct xfrm_state *);
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int (*input)(struct xfrm_state *, struct sk_buff *skb);
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int (*output)(struct xfrm_state *, struct sk_buff *pskb);
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int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
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int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
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xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *);
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xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *);
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/* Estimate maximal size of result of transformation of a dgram */
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u32 (*get_mtu)(struct xfrm_state *, int size);
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};
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extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
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extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
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extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
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extern void xfrm_put_type(struct xfrm_type *type);
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struct xfrm_mode {
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int (*input)(struct xfrm_state *x, struct sk_buff *skb);
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int (*output)(struct xfrm_state *x,struct sk_buff *skb);
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struct module *owner;
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unsigned int encap;
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};
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extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
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extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
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extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family);
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extern void xfrm_put_mode(struct xfrm_mode *mode);
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struct xfrm_tmpl
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{
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/* id in template is interpreted as:
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* daddr - destination of tunnel, may be zero for transport mode.
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* spi - zero to acquire spi. Not zero if spi is static, then
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* daddr must be fixed too.
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* proto - AH/ESP/IPCOMP
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*/
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struct xfrm_id id;
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/* Source address of tunnel. Ignored, if it is not a tunnel. */
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xfrm_address_t saddr;
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unsigned short encap_family;
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__u32 reqid;
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/* Mode: transport, tunnel etc. */
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__u8 mode;
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/* Sharing mode: unique, this session only, this user only etc. */
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__u8 share;
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/* May skip this transfomration if no SA is found */
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__u8 optional;
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/* Bit mask of algos allowed for acquisition */
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__u32 aalgos;
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__u32 ealgos;
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__u32 calgos;
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};
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#define XFRM_MAX_DEPTH 6
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struct xfrm_policy
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{
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struct xfrm_policy *next;
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struct hlist_node bydst;
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struct hlist_node byidx;
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/* This lock only affects elements except for entry. */
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rwlock_t lock;
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atomic_t refcnt;
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struct timer_list timer;
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u32 priority;
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u32 index;
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struct xfrm_selector selector;
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struct xfrm_lifetime_cfg lft;
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struct xfrm_lifetime_cur curlft;
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struct dst_entry *bundles;
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u16 family;
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u8 type;
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u8 action;
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u8 flags;
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u8 dead;
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u8 xfrm_nr;
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/* XXX 1 byte hole, try to pack */
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struct xfrm_sec_ctx *security;
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struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
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};
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struct xfrm_migrate {
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xfrm_address_t old_daddr;
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xfrm_address_t old_saddr;
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xfrm_address_t new_daddr;
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xfrm_address_t new_saddr;
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u8 proto;
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u8 mode;
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u16 reserved;
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u32 reqid;
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u16 old_family;
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u16 new_family;
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};
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#define XFRM_KM_TIMEOUT 30
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/* which seqno */
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#define XFRM_REPLAY_SEQ 1
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#define XFRM_REPLAY_OSEQ 2
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#define XFRM_REPLAY_SEQ_MASK 3
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/* what happened */
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#define XFRM_REPLAY_UPDATE XFRM_AE_CR
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#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
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/* default aevent timeout in units of 100ms */
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#define XFRM_AE_ETIME 10
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/* Async Event timer multiplier */
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#define XFRM_AE_ETH_M 10
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/* default seq threshold size */
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#define XFRM_AE_SEQT_SIZE 2
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struct xfrm_mgr
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{
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struct list_head list;
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char *id;
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int (*notify)(struct xfrm_state *x, struct km_event *c);
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int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
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struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
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int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
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int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
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int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
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int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
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};
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extern int xfrm_register_km(struct xfrm_mgr *km);
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extern int xfrm_unregister_km(struct xfrm_mgr *km);
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extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
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/* Audit Information */
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struct xfrm_audit
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{
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uid_t loginuid;
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u32 secid;
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};
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#ifdef CONFIG_AUDITSYSCALL
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extern void xfrm_audit_log(uid_t auid, u32 secid, int type, int result,
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struct xfrm_policy *xp, struct xfrm_state *x);
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#else
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#define xfrm_audit_log(a,s,t,r,p,x) do { ; } while (0)
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#endif /* CONFIG_AUDITSYSCALL */
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static inline void xfrm_pol_hold(struct xfrm_policy *policy)
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{
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if (likely(policy != NULL))
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atomic_inc(&policy->refcnt);
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}
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extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
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static inline void xfrm_pol_put(struct xfrm_policy *policy)
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{
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if (atomic_dec_and_test(&policy->refcnt))
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__xfrm_policy_destroy(policy);
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}
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#ifdef CONFIG_XFRM_SUB_POLICY
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static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
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{
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int i;
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for (i = npols - 1; i >= 0; --i)
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xfrm_pol_put(pols[i]);
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}
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#else
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static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
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{
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xfrm_pol_put(pols[0]);
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}
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#endif
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extern void __xfrm_state_destroy(struct xfrm_state *);
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static inline void __xfrm_state_put(struct xfrm_state *x)
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{
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atomic_dec(&x->refcnt);
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}
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static inline void xfrm_state_put(struct xfrm_state *x)
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{
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if (atomic_dec_and_test(&x->refcnt))
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__xfrm_state_destroy(x);
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}
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static inline void xfrm_state_hold(struct xfrm_state *x)
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{
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atomic_inc(&x->refcnt);
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}
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static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
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{
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__be32 *a1 = token1;
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__be32 *a2 = token2;
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int pdw;
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int pbi;
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pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
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pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
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if (pdw)
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if (memcmp(a1, a2, pdw << 2))
|
|
return 0;
|
|
|
|
if (pbi) {
|
|
__be32 mask;
|
|
|
|
mask = htonl((0xffffffff) << (32 - pbi));
|
|
|
|
if ((a1[pdw] ^ a2[pdw]) & mask)
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static __inline__
|
|
__be16 xfrm_flowi_sport(struct flowi *fl)
|
|
{
|
|
__be16 port;
|
|
switch(fl->proto) {
|
|
case IPPROTO_TCP:
|
|
case IPPROTO_UDP:
|
|
case IPPROTO_UDPLITE:
|
|
case IPPROTO_SCTP:
|
|
port = fl->fl_ip_sport;
|
|
break;
|
|
case IPPROTO_ICMP:
|
|
case IPPROTO_ICMPV6:
|
|
port = htons(fl->fl_icmp_type);
|
|
break;
|
|
case IPPROTO_MH:
|
|
port = htons(fl->fl_mh_type);
|
|
break;
|
|
default:
|
|
port = 0; /*XXX*/
|
|
}
|
|
return port;
|
|
}
|
|
|
|
static __inline__
|
|
__be16 xfrm_flowi_dport(struct flowi *fl)
|
|
{
|
|
__be16 port;
|
|
switch(fl->proto) {
|
|
case IPPROTO_TCP:
|
|
case IPPROTO_UDP:
|
|
case IPPROTO_UDPLITE:
|
|
case IPPROTO_SCTP:
|
|
port = fl->fl_ip_dport;
|
|
break;
|
|
case IPPROTO_ICMP:
|
|
case IPPROTO_ICMPV6:
|
|
port = htons(fl->fl_icmp_code);
|
|
break;
|
|
default:
|
|
port = 0; /*XXX*/
|
|
}
|
|
return port;
|
|
}
|
|
|
|
extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
|
|
unsigned short family);
|
|
|
|
#ifdef CONFIG_SECURITY_NETWORK_XFRM
|
|
/* If neither has a context --> match
|
|
* Otherwise, both must have a context and the sids, doi, alg must match
|
|
*/
|
|
static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
|
|
{
|
|
return ((!s1 && !s2) ||
|
|
(s1 && s2 &&
|
|
(s1->ctx_sid == s2->ctx_sid) &&
|
|
(s1->ctx_doi == s2->ctx_doi) &&
|
|
(s1->ctx_alg == s2->ctx_alg)));
|
|
}
|
|
#else
|
|
static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
|
|
{
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
/* A struct encoding bundle of transformations to apply to some set of flow.
|
|
*
|
|
* dst->child points to the next element of bundle.
|
|
* dst->xfrm points to an instanse of transformer.
|
|
*
|
|
* Due to unfortunate limitations of current routing cache, which we
|
|
* have no time to fix, it mirrors struct rtable and bound to the same
|
|
* routing key, including saddr,daddr. However, we can have many of
|
|
* bundles differing by session id. All the bundles grow from a parent
|
|
* policy rule.
|
|
*/
|
|
struct xfrm_dst
|
|
{
|
|
union {
|
|
struct dst_entry dst;
|
|
struct rtable rt;
|
|
struct rt6_info rt6;
|
|
} u;
|
|
struct dst_entry *route;
|
|
#ifdef CONFIG_XFRM_SUB_POLICY
|
|
struct flowi *origin;
|
|
struct xfrm_selector *partner;
|
|
#endif
|
|
u32 genid;
|
|
u32 route_mtu_cached;
|
|
u32 child_mtu_cached;
|
|
u32 route_cookie;
|
|
u32 path_cookie;
|
|
};
|
|
|
|
static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
|
|
{
|
|
dst_release(xdst->route);
|
|
if (likely(xdst->u.dst.xfrm))
|
|
xfrm_state_put(xdst->u.dst.xfrm);
|
|
#ifdef CONFIG_XFRM_SUB_POLICY
|
|
kfree(xdst->origin);
|
|
xdst->origin = NULL;
|
|
kfree(xdst->partner);
|
|
xdst->partner = NULL;
|
|
#endif
|
|
}
|
|
|
|
extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
|
|
|
|
struct sec_path
|
|
{
|
|
atomic_t refcnt;
|
|
int len;
|
|
struct xfrm_state *xvec[XFRM_MAX_DEPTH];
|
|
};
|
|
|
|
static inline struct sec_path *
|
|
secpath_get(struct sec_path *sp)
|
|
{
|
|
if (sp)
|
|
atomic_inc(&sp->refcnt);
|
|
return sp;
|
|
}
|
|
|
|
extern void __secpath_destroy(struct sec_path *sp);
|
|
|
|
static inline void
|
|
secpath_put(struct sec_path *sp)
|
|
{
|
|
if (sp && atomic_dec_and_test(&sp->refcnt))
|
|
__secpath_destroy(sp);
|
|
}
|
|
|
|
extern struct sec_path *secpath_dup(struct sec_path *src);
|
|
|
|
static inline void
|
|
secpath_reset(struct sk_buff *skb)
|
|
{
|
|
#ifdef CONFIG_XFRM
|
|
secpath_put(skb->sp);
|
|
skb->sp = NULL;
|
|
#endif
|
|
}
|
|
|
|
static inline int
|
|
xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
|
|
{
|
|
switch (family) {
|
|
case AF_INET:
|
|
return addr->a4 == 0;
|
|
case AF_INET6:
|
|
return ipv6_addr_any((struct in6_addr *)&addr->a6);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
__xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
|
|
{
|
|
return (tmpl->saddr.a4 &&
|
|
tmpl->saddr.a4 != x->props.saddr.a4);
|
|
}
|
|
|
|
static inline int
|
|
__xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
|
|
{
|
|
return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
|
|
ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
|
|
}
|
|
|
|
static inline int
|
|
xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
|
|
{
|
|
switch (family) {
|
|
case AF_INET:
|
|
return __xfrm4_state_addr_cmp(tmpl, x);
|
|
case AF_INET6:
|
|
return __xfrm6_state_addr_cmp(tmpl, x);
|
|
}
|
|
return !0;
|
|
}
|
|
|
|
#ifdef CONFIG_XFRM
|
|
|
|
extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
|
|
|
|
static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
|
|
{
|
|
if (sk && sk->sk_policy[XFRM_POLICY_IN])
|
|
return __xfrm_policy_check(sk, dir, skb, family);
|
|
|
|
return (!xfrm_policy_count[dir] && !skb->sp) ||
|
|
(skb->dst->flags & DST_NOPOLICY) ||
|
|
__xfrm_policy_check(sk, dir, skb, family);
|
|
}
|
|
|
|
static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
|
|
{
|
|
return xfrm_policy_check(sk, dir, skb, AF_INET);
|
|
}
|
|
|
|
static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
|
|
{
|
|
return xfrm_policy_check(sk, dir, skb, AF_INET6);
|
|
}
|
|
|
|
extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
|
|
extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
|
|
|
|
static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
|
|
{
|
|
return !xfrm_policy_count[XFRM_POLICY_OUT] ||
|
|
(skb->dst->flags & DST_NOXFRM) ||
|
|
__xfrm_route_forward(skb, family);
|
|
}
|
|
|
|
static inline int xfrm4_route_forward(struct sk_buff *skb)
|
|
{
|
|
return xfrm_route_forward(skb, AF_INET);
|
|
}
|
|
|
|
static inline int xfrm6_route_forward(struct sk_buff *skb)
|
|
{
|
|
return xfrm_route_forward(skb, AF_INET6);
|
|
}
|
|
|
|
extern int __xfrm_sk_clone_policy(struct sock *sk);
|
|
|
|
static inline int xfrm_sk_clone_policy(struct sock *sk)
|
|
{
|
|
if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
|
|
return __xfrm_sk_clone_policy(sk);
|
|
return 0;
|
|
}
|
|
|
|
extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
|
|
|
|
static inline void xfrm_sk_free_policy(struct sock *sk)
|
|
{
|
|
if (unlikely(sk->sk_policy[0] != NULL)) {
|
|
xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
|
|
sk->sk_policy[0] = NULL;
|
|
}
|
|
if (unlikely(sk->sk_policy[1] != NULL)) {
|
|
xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
|
|
sk->sk_policy[1] = NULL;
|
|
}
|
|
}
|
|
|
|
#else
|
|
|
|
static inline void xfrm_sk_free_policy(struct sock *sk) {}
|
|
static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
|
|
static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
|
|
static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
|
|
static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
|
|
{
|
|
return 1;
|
|
}
|
|
static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
|
|
{
|
|
return 1;
|
|
}
|
|
static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
|
|
{
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
static __inline__
|
|
xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
|
|
{
|
|
switch (family){
|
|
case AF_INET:
|
|
return (xfrm_address_t *)&fl->fl4_dst;
|
|
case AF_INET6:
|
|
return (xfrm_address_t *)&fl->fl6_dst;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static __inline__
|
|
xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
|
|
{
|
|
switch (family){
|
|
case AF_INET:
|
|
return (xfrm_address_t *)&fl->fl4_src;
|
|
case AF_INET6:
|
|
return (xfrm_address_t *)&fl->fl6_src;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static __inline__ int
|
|
__xfrm4_state_addr_check(struct xfrm_state *x,
|
|
xfrm_address_t *daddr, xfrm_address_t *saddr)
|
|
{
|
|
if (daddr->a4 == x->id.daddr.a4 &&
|
|
(saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static __inline__ int
|
|
__xfrm6_state_addr_check(struct xfrm_state *x,
|
|
xfrm_address_t *daddr, xfrm_address_t *saddr)
|
|
{
|
|
if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
|
|
(!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
|
|
ipv6_addr_any((struct in6_addr *)saddr) ||
|
|
ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static __inline__ int
|
|
xfrm_state_addr_check(struct xfrm_state *x,
|
|
xfrm_address_t *daddr, xfrm_address_t *saddr,
|
|
unsigned short family)
|
|
{
|
|
switch (family) {
|
|
case AF_INET:
|
|
return __xfrm4_state_addr_check(x, daddr, saddr);
|
|
case AF_INET6:
|
|
return __xfrm6_state_addr_check(x, daddr, saddr);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static __inline__ int
|
|
xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
|
|
unsigned short family)
|
|
{
|
|
switch (family) {
|
|
case AF_INET:
|
|
return __xfrm4_state_addr_check(x,
|
|
(xfrm_address_t *)&fl->fl4_dst,
|
|
(xfrm_address_t *)&fl->fl4_src);
|
|
case AF_INET6:
|
|
return __xfrm6_state_addr_check(x,
|
|
(xfrm_address_t *)&fl->fl6_dst,
|
|
(xfrm_address_t *)&fl->fl6_src);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline int xfrm_state_kern(struct xfrm_state *x)
|
|
{
|
|
return atomic_read(&x->tunnel_users);
|
|
}
|
|
|
|
static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
|
|
{
|
|
return (!userproto || proto == userproto ||
|
|
(userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
|
|
proto == IPPROTO_ESP ||
|
|
proto == IPPROTO_COMP)));
|
|
}
|
|
|
|
/*
|
|
* xfrm algorithm information
|
|
*/
|
|
struct xfrm_algo_auth_info {
|
|
u16 icv_truncbits;
|
|
u16 icv_fullbits;
|
|
};
|
|
|
|
struct xfrm_algo_encr_info {
|
|
u16 blockbits;
|
|
u16 defkeybits;
|
|
};
|
|
|
|
struct xfrm_algo_comp_info {
|
|
u16 threshold;
|
|
};
|
|
|
|
struct xfrm_algo_desc {
|
|
char *name;
|
|
char *compat;
|
|
u8 available:1;
|
|
union {
|
|
struct xfrm_algo_auth_info auth;
|
|
struct xfrm_algo_encr_info encr;
|
|
struct xfrm_algo_comp_info comp;
|
|
} uinfo;
|
|
struct sadb_alg desc;
|
|
};
|
|
|
|
/* XFRM tunnel handlers. */
|
|
struct xfrm_tunnel {
|
|
int (*handler)(struct sk_buff *skb);
|
|
int (*err_handler)(struct sk_buff *skb, __u32 info);
|
|
|
|
struct xfrm_tunnel *next;
|
|
int priority;
|
|
};
|
|
|
|
struct xfrm6_tunnel {
|
|
int (*handler)(struct sk_buff *skb);
|
|
int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
|
|
int type, int code, int offset, __be32 info);
|
|
struct xfrm6_tunnel *next;
|
|
int priority;
|
|
};
|
|
|
|
extern void xfrm_init(void);
|
|
extern void xfrm4_init(void);
|
|
extern void xfrm6_init(void);
|
|
extern void xfrm6_fini(void);
|
|
extern void xfrm_state_init(void);
|
|
extern void xfrm4_state_init(void);
|
|
extern void xfrm6_state_init(void);
|
|
extern void xfrm6_state_fini(void);
|
|
|
|
extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
|
|
extern struct xfrm_state *xfrm_state_alloc(void);
|
|
extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
|
|
struct flowi *fl, struct xfrm_tmpl *tmpl,
|
|
struct xfrm_policy *pol, int *err,
|
|
unsigned short family);
|
|
extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
|
|
xfrm_address_t *saddr,
|
|
unsigned short family,
|
|
u8 mode, u8 proto, u32 reqid);
|
|
extern int xfrm_state_check_expire(struct xfrm_state *x);
|
|
extern void xfrm_state_insert(struct xfrm_state *x);
|
|
extern int xfrm_state_add(struct xfrm_state *x);
|
|
extern int xfrm_state_update(struct xfrm_state *x);
|
|
extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
|
|
extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
|
|
#ifdef CONFIG_XFRM_SUB_POLICY
|
|
extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
|
|
int n, unsigned short family);
|
|
extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
|
|
int n, unsigned short family);
|
|
#else
|
|
static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
|
|
int n, unsigned short family)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
|
|
int n, unsigned short family)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
#endif
|
|
|
|
struct xfrmk_sadinfo {
|
|
u32 sadhcnt; /* current hash bkts */
|
|
u32 sadhmcnt; /* max allowed hash bkts */
|
|
u32 sadcnt; /* current running count */
|
|
};
|
|
|
|
struct xfrmk_spdinfo {
|
|
u32 incnt;
|
|
u32 outcnt;
|
|
u32 fwdcnt;
|
|
u32 inscnt;
|
|
u32 outscnt;
|
|
u32 fwdscnt;
|
|
u32 spdhcnt;
|
|
u32 spdhmcnt;
|
|
};
|
|
|
|
extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
|
|
extern int xfrm_state_delete(struct xfrm_state *x);
|
|
extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
|
|
extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
|
|
extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
|
|
extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
|
|
extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
|
|
extern void xfrm_replay_notify(struct xfrm_state *x, int event);
|
|
extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
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extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
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extern int xfrm_init_state(struct xfrm_state *x);
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extern int xfrm4_rcv(struct sk_buff *skb);
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extern int xfrm4_output(struct sk_buff *skb);
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extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
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extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
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extern int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi);
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extern int xfrm6_rcv(struct sk_buff **pskb);
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extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
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xfrm_address_t *saddr, u8 proto);
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extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
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extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
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extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
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extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
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extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
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extern int xfrm6_output(struct sk_buff *skb);
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extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
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u8 **prevhdr);
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|
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#ifdef CONFIG_XFRM
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extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
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extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
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extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
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#else
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static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
|
|
{
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return -ENOPROTOOPT;
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|
}
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|
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static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
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|
{
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/* should not happen */
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|
kfree_skb(skb);
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return 0;
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|
}
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|
|
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static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
|
|
{
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return -EINVAL;
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}
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#endif
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|
|
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struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
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extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
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int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
|
|
struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
|
|
struct xfrm_selector *sel,
|
|
struct xfrm_sec_ctx *ctx, int delete,
|
|
int *err);
|
|
struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
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|
int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
|
|
u32 xfrm_get_acqseq(void);
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|
void xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi);
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|
struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
|
|
xfrm_address_t *daddr, xfrm_address_t *saddr,
|
|
int create, unsigned short family);
|
|
extern int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
|
|
extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
|
|
extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
|
|
struct flowi *fl, int family, int strict);
|
|
extern void xfrm_init_pmtu(struct dst_entry *dst);
|
|
|
|
#ifdef CONFIG_XFRM_MIGRATE
|
|
extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
|
|
struct xfrm_migrate *m, int num_bundles);
|
|
extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
|
|
extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
|
|
struct xfrm_migrate *m);
|
|
extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
|
|
struct xfrm_migrate *m, int num_bundles);
|
|
#endif
|
|
|
|
extern wait_queue_head_t km_waitq;
|
|
extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
|
|
extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
|
|
extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
|
|
|
|
extern void xfrm_input_init(void);
|
|
extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
|
|
|
|
extern void xfrm_probe_algs(void);
|
|
extern int xfrm_count_auth_supported(void);
|
|
extern int xfrm_count_enc_supported(void);
|
|
extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
|
|
extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
|
|
extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
|
|
extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
|
|
extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
|
|
extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
|
|
extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
|
|
extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
|
|
|
|
struct hash_desc;
|
|
struct scatterlist;
|
|
typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
|
|
unsigned int);
|
|
|
|
extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
|
|
int offset, int len, icv_update_fn_t icv_update);
|
|
|
|
static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
|
|
int family)
|
|
{
|
|
switch (family) {
|
|
default:
|
|
case AF_INET:
|
|
return (__force __u32)a->a4 - (__force __u32)b->a4;
|
|
case AF_INET6:
|
|
return ipv6_addr_cmp((struct in6_addr *)a,
|
|
(struct in6_addr *)b);
|
|
}
|
|
}
|
|
|
|
static inline int xfrm_policy_id2dir(u32 index)
|
|
{
|
|
return index & 7;
|
|
}
|
|
|
|
static inline int xfrm_aevent_is_on(void)
|
|
{
|
|
struct sock *nlsk;
|
|
int ret = 0;
|
|
|
|
rcu_read_lock();
|
|
nlsk = rcu_dereference(xfrm_nl);
|
|
if (nlsk)
|
|
ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
|
|
static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
|
|
{
|
|
if (xfrm_aevent_is_on())
|
|
xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
|
|
}
|
|
|
|
#ifdef CONFIG_XFRM_MIGRATE
|
|
static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
|
|
{
|
|
return (struct xfrm_algo *)kmemdup(orig, sizeof(*orig) + orig->alg_key_len, GFP_KERNEL);
|
|
}
|
|
|
|
static inline void xfrm_states_put(struct xfrm_state **states, int n)
|
|
{
|
|
int i;
|
|
for (i = 0; i < n; i++)
|
|
xfrm_state_put(*(states + i));
|
|
}
|
|
|
|
static inline void xfrm_states_delete(struct xfrm_state **states, int n)
|
|
{
|
|
int i;
|
|
for (i = 0; i < n; i++)
|
|
xfrm_state_delete(*(states + i));
|
|
}
|
|
#endif
|
|
|
|
#endif /* _NET_XFRM_H */
|