diff options
Diffstat (limited to 'include/net/xfrm.h')
| -rw-r--r-- | include/net/xfrm.h | 1693 |
1 files changed, 1693 insertions, 0 deletions
diff --git a/include/net/xfrm.h b/include/net/xfrm.h new file mode 100644 index 00000000..96239e78 --- /dev/null +++ b/include/net/xfrm.h @@ -0,0 +1,1693 @@ +#ifndef _NET_XFRM_H +#define _NET_XFRM_H + +#include <linux/compiler.h> +#include <linux/xfrm.h> +#include <linux/spinlock.h> +#include <linux/list.h> +#include <linux/skbuff.h> +#include <linux/socket.h> +#include <linux/pfkeyv2.h> +#include <linux/ipsec.h> +#include <linux/in6.h> +#include <linux/mutex.h> +#include <linux/audit.h> +#include <linux/slab.h> + +#include <net/sock.h> +#include <net/dst.h> +#include <net/ip.h> +#include <net/route.h> +#include <net/ipv6.h> +#include <net/ip6_fib.h> +#include <net/flow.h> + +#include <linux/interrupt.h> + +#ifdef CONFIG_XFRM_STATISTICS +#include <net/snmp.h> +#endif + +#define XFRM_PROTO_ESP 50 +#define XFRM_PROTO_AH 51 +#define XFRM_PROTO_COMP 108 +#define XFRM_PROTO_IPIP 4 +#define XFRM_PROTO_IPV6 41 +#define XFRM_PROTO_ROUTING IPPROTO_ROUTING +#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS + +#define XFRM_ALIGN4(len) (((len) + 3) & ~3) +#define XFRM_ALIGN8(len) (((len) + 7) & ~7) +#define MODULE_ALIAS_XFRM_MODE(family, encap) \ + MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap)) +#define MODULE_ALIAS_XFRM_TYPE(family, proto) \ + MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto)) + +#ifdef CONFIG_XFRM_STATISTICS +#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field) +#define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field) +#define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field) +#else +#define XFRM_INC_STATS(net, field) ((void)(net)) +#define XFRM_INC_STATS_BH(net, field) ((void)(net)) +#define XFRM_INC_STATS_USER(net, field) ((void)(net)) +#endif + +extern struct mutex xfrm_cfg_mutex; + +/* Organization of SPD aka "XFRM rules" + ------------------------------------ + + Basic objects: + - policy rule, struct xfrm_policy (=SPD entry) + - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) + - instance of a transformer, struct xfrm_state (=SA) + - template to clone xfrm_state, struct xfrm_tmpl + + SPD is plain linear list of xfrm_policy rules, ordered by priority. + (To be compatible with existing pfkeyv2 implementations, + many rules with priority of 0x7fffffff are allowed to exist and + such rules are ordered in an unpredictable way, thanks to bsd folks.) + + Lookup is plain linear search until the first match with selector. + + If "action" is "block", then we prohibit the flow, otherwise: + if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, + policy entry has list of up to XFRM_MAX_DEPTH transformations, + described by templates xfrm_tmpl. Each template is resolved + to a complete xfrm_state (see below) and we pack bundle of transformations + to a dst_entry returned to requestor. + + dst -. xfrm .-> xfrm_state #1 + |---. child .-> dst -. xfrm .-> xfrm_state #2 + |---. child .-> dst -. xfrm .-> xfrm_state #3 + |---. child .-> NULL + + Bundles are cached at xrfm_policy struct (field ->bundles). + + + Resolution of xrfm_tmpl + ----------------------- + Template contains: + 1. ->mode Mode: transport or tunnel + 2. ->id.proto Protocol: AH/ESP/IPCOMP + 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. + Q: allow to resolve security gateway? + 4. ->id.spi If not zero, static SPI. + 5. ->saddr Local tunnel endpoint, ignored for transport mode. + 6. ->algos List of allowed algos. Plain bitmask now. + Q: ealgos, aalgos, calgos. What a mess... + 7. ->share Sharing mode. + Q: how to implement private sharing mode? To add struct sock* to + flow id? + + Having this template we search through SAD searching for entries + with appropriate mode/proto/algo, permitted by selector. + If no appropriate entry found, it is requested from key manager. + + PROBLEMS: + Q: How to find all the bundles referring to a physical path for + PMTU discovery? Seems, dst should contain list of all parents... + and enter to infinite locking hierarchy disaster. + No! It is easier, we will not search for them, let them find us. + We add genid to each dst plus pointer to genid of raw IP route, + pmtu disc will update pmtu on raw IP route and increase its genid. + dst_check() will see this for top level and trigger resyncing + metrics. Plus, it will be made via sk->sk_dst_cache. Solved. + */ + +struct xfrm_state_walk { + struct list_head all; + u8 state; + union { + u8 dying; + u8 proto; + }; + u32 seq; +}; + +/* Full description of state of transformer. */ +struct xfrm_state { +#ifdef CONFIG_NET_NS + struct net *xs_net; +#endif + union { + struct hlist_node gclist; + struct hlist_node bydst; + }; + struct hlist_node bysrc; + struct hlist_node byspi; + + atomic_t refcnt; + spinlock_t lock; + + struct xfrm_id id; + struct xfrm_selector sel; + struct xfrm_mark mark; + u32 tfcpad; + + u32 genid; + + /* Key manager bits */ + struct xfrm_state_walk km; + + /* Parameters of this state. */ + struct { + u32 reqid; + u8 mode; + u8 replay_window; + u8 aalgo, ealgo, calgo; + u8 flags; + u16 family; + xfrm_address_t saddr; + int header_len; + int trailer_len; + } props; + + struct xfrm_lifetime_cfg lft; + + /* Data for transformer */ + struct xfrm_algo_auth *aalg; + struct xfrm_algo *ealg; + struct xfrm_algo *calg; + struct xfrm_algo_aead *aead; + + /* Data for encapsulator */ + struct xfrm_encap_tmpl *encap; + + /* Data for care-of address */ + xfrm_address_t *coaddr; + + /* IPComp needs an IPIP tunnel for handling uncompressed packets */ + struct xfrm_state *tunnel; + + /* If a tunnel, number of users + 1 */ + atomic_t tunnel_users; + + /* State for replay detection */ + struct xfrm_replay_state replay; + struct xfrm_replay_state_esn *replay_esn; + + /* Replay detection state at the time we sent the last notification */ + struct xfrm_replay_state preplay; + struct xfrm_replay_state_esn *preplay_esn; + + /* The functions for replay detection. */ + struct xfrm_replay *repl; + + /* internal flag that only holds state for delayed aevent at the + * moment + */ + u32 xflags; + + /* Replay detection notification settings */ + u32 replay_maxage; + u32 replay_maxdiff; + + /* Replay detection notification timer */ + struct timer_list rtimer; + + /* Statistics */ + struct xfrm_stats stats; + + struct xfrm_lifetime_cur curlft; + struct tasklet_hrtimer mtimer; + + /* Last used time */ + unsigned long lastused; + + /* Reference to data common to all the instances of this + * transformer. */ + const struct xfrm_type *type; + struct xfrm_mode *inner_mode; + struct xfrm_mode *inner_mode_iaf; + struct xfrm_mode *outer_mode; + + /* Security context */ + struct xfrm_sec_ctx *security; + + /* Private data of this transformer, format is opaque, + * interpreted by xfrm_type methods. */ + void *data; +}; + +static inline struct net *xs_net(struct xfrm_state *x) +{ + return read_pnet(&x->xs_net); +} + +/* xflags - make enum if more show up */ +#define XFRM_TIME_DEFER 1 + +enum { + XFRM_STATE_VOID, + XFRM_STATE_ACQ, + XFRM_STATE_VALID, + XFRM_STATE_ERROR, + XFRM_STATE_EXPIRED, + XFRM_STATE_DEAD +}; + +/* callback structure passed from either netlink or pfkey */ +struct km_event { + union { + u32 hard; + u32 proto; + u32 byid; + u32 aevent; + u32 type; + } data; + + u32 seq; + u32 pid; + u32 event; + struct net *net; +}; + +struct xfrm_replay { + void (*advance)(struct xfrm_state *x, __be32 net_seq); + int (*check)(struct xfrm_state *x, + struct sk_buff *skb, + __be32 net_seq); + void (*notify)(struct xfrm_state *x, int event); + int (*overflow)(struct xfrm_state *x, struct sk_buff *skb); +}; + +struct net_device; +struct xfrm_type; +struct xfrm_dst; +struct xfrm_policy_afinfo { + unsigned short family; + struct dst_ops *dst_ops; + void (*garbage_collect)(struct net *net); + struct dst_entry *(*dst_lookup)(struct net *net, int tos, + const xfrm_address_t *saddr, + const xfrm_address_t *daddr); + int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr); + void (*decode_session)(struct sk_buff *skb, + struct flowi *fl, + int reverse); + int (*get_tos)(const struct flowi *fl); + int (*init_path)(struct xfrm_dst *path, + struct dst_entry *dst, + int nfheader_len); + int (*fill_dst)(struct xfrm_dst *xdst, + struct net_device *dev, + const struct flowi *fl); + struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig); +}; + +extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); +extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); +extern void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c); +extern void km_state_notify(struct xfrm_state *x, const struct km_event *c); + +struct xfrm_tmpl; +extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); +extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); +extern int __xfrm_state_delete(struct xfrm_state *x); + +struct xfrm_state_afinfo { + unsigned int family; + unsigned int proto; + __be16 eth_proto; + struct module *owner; + const struct xfrm_type *type_map[IPPROTO_MAX]; + struct xfrm_mode *mode_map[XFRM_MODE_MAX]; + int (*init_flags)(struct xfrm_state *x); + void (*init_tempsel)(struct xfrm_selector *sel, + const struct flowi *fl); + void (*init_temprop)(struct xfrm_state *x, + const struct xfrm_tmpl *tmpl, + const xfrm_address_t *daddr, + const xfrm_address_t *saddr); + int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); + int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); + int (*output)(struct sk_buff *skb); + int (*output_finish)(struct sk_buff *skb); + int (*extract_input)(struct xfrm_state *x, + struct sk_buff *skb); + int (*extract_output)(struct xfrm_state *x, + struct sk_buff *skb); + int (*transport_finish)(struct sk_buff *skb, + int async); +}; + +extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); +extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); + +extern void xfrm_state_delete_tunnel(struct xfrm_state *x); + +struct xfrm_type { + char *description; + struct module *owner; + u8 proto; + u8 flags; +#define XFRM_TYPE_NON_FRAGMENT 1 +#define XFRM_TYPE_REPLAY_PROT 2 +#define XFRM_TYPE_LOCAL_COADDR 4 +#define XFRM_TYPE_REMOTE_COADDR 8 + + int (*init_state)(struct xfrm_state *x); + void (*destructor)(struct xfrm_state *); + int (*input)(struct xfrm_state *, struct sk_buff *skb); + int (*output)(struct xfrm_state *, struct sk_buff *pskb); + int (*reject)(struct xfrm_state *, struct sk_buff *, + const struct flowi *); + int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); + /* Estimate maximal size of result of transformation of a dgram */ + u32 (*get_mtu)(struct xfrm_state *, int size); +}; + +extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family); +extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); + +struct xfrm_mode { + /* + * Remove encapsulation header. + * + * The IP header will be moved over the top of the encapsulation + * header. + * + * On entry, the transport header shall point to where the IP header + * should be and the network header shall be set to where the IP + * header currently is. skb->data shall point to the start of the + * payload. + */ + int (*input2)(struct xfrm_state *x, struct sk_buff *skb); + + /* + * This is the actual input entry point. + * + * For transport mode and equivalent this would be identical to + * input2 (which does not need to be set). While tunnel mode + * and equivalent would set this to the tunnel encapsulation function + * xfrm4_prepare_input that would in turn call input2. + */ + int (*input)(struct xfrm_state *x, struct sk_buff *skb); + + /* + * Add encapsulation header. + * + * On exit, the transport header will be set to the start of the + * encapsulation header to be filled in by x->type->output and + * the mac header will be set to the nextheader (protocol for + * IPv4) field of the extension header directly preceding the + * encapsulation header, or in its absence, that of the top IP + * header. The value of the network header will always point + * to the top IP header while skb->data will point to the payload. + */ + int (*output2)(struct xfrm_state *x,struct sk_buff *skb); + + /* + * This is the actual output entry point. + * + * For transport mode and equivalent this would be identical to + * output2 (which does not need to be set). While tunnel mode + * and equivalent would set this to a tunnel encapsulation function + * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn + * call output2. + */ + int (*output)(struct xfrm_state *x, struct sk_buff *skb); + + struct xfrm_state_afinfo *afinfo; + struct module *owner; + unsigned int encap; + int flags; +}; + +/* Flags for xfrm_mode. */ +enum { + XFRM_MODE_FLAG_TUNNEL = 1, +}; + +extern int xfrm_register_mode(struct xfrm_mode *mode, int family); +extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family); + +static inline int xfrm_af2proto(unsigned int family) +{ + switch(family) { + case AF_INET: + return IPPROTO_IPIP; + case AF_INET6: + return IPPROTO_IPV6; + default: + return 0; + } +} + +static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) +{ + if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || + (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) + return x->inner_mode; + else + return x->inner_mode_iaf; +} + +struct xfrm_tmpl { +/* id in template is interpreted as: + * daddr - destination of tunnel, may be zero for transport mode. + * spi - zero to acquire spi. Not zero if spi is static, then + * daddr must be fixed too. + * proto - AH/ESP/IPCOMP + */ + struct xfrm_id id; + +/* Source address of tunnel. Ignored, if it is not a tunnel. */ + xfrm_address_t saddr; + + unsigned short encap_family; + + u32 reqid; + +/* Mode: transport, tunnel etc. */ + u8 mode; + +/* Sharing mode: unique, this session only, this user only etc. */ + u8 share; + +/* May skip this transfomration if no SA is found */ + u8 optional; + +/* Skip aalgos/ealgos/calgos checks. */ + u8 allalgs; + +/* Bit mask of algos allowed for acquisition */ + u32 aalgos; + u32 ealgos; + u32 calgos; +}; + +#define XFRM_MAX_DEPTH 6 + +struct xfrm_policy_walk_entry { + struct list_head all; + u8 dead; +}; + +struct xfrm_policy_walk { + struct xfrm_policy_walk_entry walk; + u8 type; + u32 seq; +}; + +struct xfrm_policy { +#ifdef CONFIG_NET_NS + struct net *xp_net; +#endif + struct hlist_node bydst; + struct hlist_node byidx; + + /* This lock only affects elements except for entry. */ + rwlock_t lock; + atomic_t refcnt; + struct timer_list timer; + + struct flow_cache_object flo; + atomic_t genid; + u32 priority; + u32 index; + struct xfrm_mark mark; + struct xfrm_selector selector; + struct xfrm_lifetime_cfg lft; + struct xfrm_lifetime_cur curlft; + struct xfrm_policy_walk_entry walk; + u8 type; + u8 action; + u8 flags; + u8 xfrm_nr; + u16 family; + struct xfrm_sec_ctx *security; + struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; +}; + +static inline struct net *xp_net(const struct xfrm_policy *xp) +{ + return read_pnet(&xp->xp_net); +} + +struct xfrm_kmaddress { + xfrm_address_t local; + xfrm_address_t remote; + u32 reserved; + u16 family; +}; + +struct xfrm_migrate { + xfrm_address_t old_daddr; + xfrm_address_t old_saddr; + xfrm_address_t new_daddr; + xfrm_address_t new_saddr; + u8 proto; + u8 mode; + u16 reserved; + u32 reqid; + u16 old_family; + u16 new_family; +}; + +#define XFRM_KM_TIMEOUT 30 +/* which seqno */ +#define XFRM_REPLAY_SEQ 1 +#define XFRM_REPLAY_OSEQ 2 +#define XFRM_REPLAY_SEQ_MASK 3 +/* what happened */ +#define XFRM_REPLAY_UPDATE XFRM_AE_CR +#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE + +/* default aevent timeout in units of 100ms */ +#define XFRM_AE_ETIME 10 +/* Async Event timer multiplier */ +#define XFRM_AE_ETH_M 10 +/* default seq threshold size */ +#define XFRM_AE_SEQT_SIZE 2 + +struct xfrm_mgr { + struct list_head list; + char *id; + int (*notify)(struct xfrm_state *x, const struct km_event *c); + int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); + struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); + int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); + int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c); + int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); + int (*migrate)(const struct xfrm_selector *sel, + u8 dir, u8 type, + const struct xfrm_migrate *m, + int num_bundles, + const struct xfrm_kmaddress *k); +}; + +extern int xfrm_register_km(struct xfrm_mgr *km); +extern int xfrm_unregister_km(struct xfrm_mgr *km); + +/* + * This structure is used for the duration where packets are being + * transformed by IPsec. As soon as the packet leaves IPsec the + * area beyond the generic IP part may be overwritten. + */ +struct xfrm_skb_cb { + union { + struct inet_skb_parm h4; + struct inet6_skb_parm h6; + } header; + + /* Sequence number for replay protection. */ + union { + struct { + __u32 low; + __u32 hi; + } output; + struct { + __be32 low; + __be32 hi; + } input; + } seq; +}; + +#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) + +/* + * This structure is used by the afinfo prepare_input/prepare_output functions + * to transmit header information to the mode input/output functions. + */ +struct xfrm_mode_skb_cb { + union { + struct inet_skb_parm h4; + struct inet6_skb_parm h6; + } header; + + /* Copied from header for IPv4, always set to zero and DF for IPv6. */ + __be16 id; + __be16 frag_off; + + /* IP header length (excluding options or extension headers). */ + u8 ihl; + + /* TOS for IPv4, class for IPv6. */ + u8 tos; + + /* TTL for IPv4, hop limitfor IPv6. */ + u8 ttl; + + /* Protocol for IPv4, NH for IPv6. */ + u8 protocol; + + /* Option length for IPv4, zero for IPv6. */ + u8 optlen; + + /* Used by IPv6 only, zero for IPv4. */ + u8 flow_lbl[3]; +}; + +#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) + +/* + * This structure is used by the input processing to locate the SPI and + * related information. + */ +struct xfrm_spi_skb_cb { + union { + struct inet_skb_parm h4; + struct inet6_skb_parm h6; + } header; + + unsigned int daddroff; + unsigned int family; +}; + +#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) + +/* Audit Information */ +struct xfrm_audit { + u32 secid; + uid_t loginuid; + u32 sessionid; +}; + +#ifdef CONFIG_AUDITSYSCALL +static inline struct audit_buffer *xfrm_audit_start(const char *op) +{ + struct audit_buffer *audit_buf = NULL; + + if (audit_enabled == 0) + return NULL; + audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, + AUDIT_MAC_IPSEC_EVENT); + if (audit_buf == NULL) + return NULL; + audit_log_format(audit_buf, "op=%s", op); + return audit_buf; +} + +static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid, + struct audit_buffer *audit_buf) +{ + char *secctx; + u32 secctx_len; + + audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); + if (secid != 0 && + security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) { + audit_log_format(audit_buf, " subj=%s", secctx); + security_release_secctx(secctx, secctx_len); + } else + audit_log_task_context(audit_buf); +} + +extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, + u32 auid, u32 ses, u32 secid); +extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, + u32 auid, u32 ses, u32 secid); +extern void xfrm_audit_state_add(struct xfrm_state *x, int result, + u32 auid, u32 ses, u32 secid); +extern void xfrm_audit_state_delete(struct xfrm_state *x, int result, + u32 auid, u32 ses, u32 secid); +extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x, + struct sk_buff *skb); +extern void xfrm_audit_state_replay(struct xfrm_state *x, + struct sk_buff *skb, __be32 net_seq); +extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); +extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, + __be32 net_spi, __be32 net_seq); +extern void xfrm_audit_state_icvfail(struct xfrm_state *x, + struct sk_buff *skb, u8 proto); +#else + +static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, + u32 auid, u32 ses, u32 secid) +{ +} + +static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, + u32 auid, u32 ses, u32 secid) +{ +} + +static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, + u32 auid, u32 ses, u32 secid) +{ +} + +static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, + u32 auid, u32 ses, u32 secid) +{ +} + +static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, + struct sk_buff *skb) +{ +} + +static inline void xfrm_audit_state_replay(struct xfrm_state *x, + struct sk_buff *skb, __be32 net_seq) +{ +} + +static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, + u16 family) +{ +} + +static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, + __be32 net_spi, __be32 net_seq) +{ +} + +static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, + struct sk_buff *skb, u8 proto) +{ +} +#endif /* CONFIG_AUDITSYSCALL */ + +static inline void xfrm_pol_hold(struct xfrm_policy *policy) +{ + if (likely(policy != NULL)) + atomic_inc(&policy->refcnt); +} + +extern void xfrm_policy_destroy(struct xfrm_policy *policy); + +static inline void xfrm_pol_put(struct xfrm_policy *policy) +{ + if (atomic_dec_and_test(&policy->refcnt)) + xfrm_policy_destroy(policy); +} + +static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) +{ + int i; + for (i = npols - 1; i >= 0; --i) + xfrm_pol_put(pols[i]); +} + +extern void __xfrm_state_destroy(struct xfrm_state *); + +static inline void __xfrm_state_put(struct xfrm_state *x) +{ + atomic_dec(&x->refcnt); +} + +static inline void xfrm_state_put(struct xfrm_state *x) +{ + if (atomic_dec_and_test(&x->refcnt)) + __xfrm_state_destroy(x); +} + +static inline void xfrm_state_hold(struct xfrm_state *x) +{ + atomic_inc(&x->refcnt); +} + +static inline bool addr_match(const void *token1, const void *token2, + int prefixlen) +{ + const __be32 *a1 = token1; + const __be32 *a2 = token2; + int pdw; + int pbi; + + pdw = prefixlen >> 5; /* num of whole u32 in prefix */ + pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ + + if (pdw) + if (memcmp(a1, a2, pdw << 2)) + return false; + + if (pbi) { + __be32 mask; + + mask = htonl((0xffffffff) << (32 - pbi)); + + if ((a1[pdw] ^ a2[pdw]) & mask) + return false; + } + + return true; +} + +static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) +{ + /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ + if (prefixlen == 0) + return true; + return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen))); +} + +static __inline__ +__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) +{ + __be16 port; + switch(fl->flowi_proto) { + case IPPROTO_TCP: + case IPPROTO_UDP: + case IPPROTO_UDPLITE: + case IPPROTO_SCTP: + port = uli->ports.sport; + break; + case IPPROTO_ICMP: + case IPPROTO_ICMPV6: + port = htons(uli->icmpt.type); + break; + case IPPROTO_MH: + port = htons(uli->mht.type); + break; + case IPPROTO_GRE: + port = htons(ntohl(uli->gre_key) >> 16); + break; + default: + port = 0; /*XXX*/ + } + return port; +} + +static __inline__ +__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli) +{ + __be16 port; + switch(fl->flowi_proto) { + case IPPROTO_TCP: + case IPPROTO_UDP: + case IPPROTO_UDPLITE: + case IPPROTO_SCTP: + port = uli->ports.dport; + break; + case IPPROTO_ICMP: + case IPPROTO_ICMPV6: + port = htons(uli->icmpt.code); + break; + case IPPROTO_GRE: + port = htons(ntohl(uli->gre_key) & 0xffff); + break; + default: + port = 0; /*XXX*/ + } + return port; +} + +extern int xfrm_selector_match(const struct xfrm_selector *sel, + const 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; + struct flow_cache_object flo; + struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; + int num_pols, num_xfrms; +#ifdef CONFIG_XFRM_SUB_POLICY + struct flowi *origin; + struct xfrm_selector *partner; +#endif + u32 xfrm_genid; + u32 policy_genid; + u32 route_mtu_cached; + u32 child_mtu_cached; + u32 route_cookie; + u32 path_cookie; +}; + +#ifdef CONFIG_XFRM +static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) +{ + xfrm_pols_put(xdst->pols, xdst->num_pols); + 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 +} +#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 int secpath_exists(struct sk_buff *skb) +{ +#ifdef CONFIG_XFRM + return skb->sp != NULL; +#else + return 0; +#endif +} + +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(const 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(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) +{ + return (tmpl->saddr.a4 && + tmpl->saddr.a4 != x->props.saddr.a4); +} + +static inline int +__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const 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(const struct xfrm_tmpl *tmpl, const 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_check2(struct sock *sk, int dir, + struct sk_buff *skb, + unsigned int family, int reverse) +{ + struct net *net = dev_net(skb->dev); + int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); + + if (sk && sk->sk_policy[XFRM_POLICY_IN]) + return __xfrm_policy_check(sk, ndir, skb, family); + + return (!net->xfrm.policy_count[dir] && !skb->sp) || + (skb_dst(skb)->flags & DST_NOPOLICY) || + __xfrm_policy_check(sk, ndir, skb, family); +} + +static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) +{ + return __xfrm_policy_check2(sk, dir, skb, family, 0); +} + +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); +} + +static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, + struct sk_buff *skb) +{ + return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); +} + +static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, + struct sk_buff *skb) +{ + return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); +} + +extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, + unsigned int family, int reverse); + +static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, + unsigned int family) +{ + return __xfrm_decode_session(skb, fl, family, 0); +} + +static inline int xfrm_decode_session_reverse(struct sk_buff *skb, + struct flowi *fl, + unsigned int family) +{ + return __xfrm_decode_session(skb, fl, family, 1); +} + +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) +{ + struct net *net = dev_net(skb->dev); + + return !net->xfrm.policy_count[XFRM_POLICY_OUT] || + (skb_dst(skb)->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; +} +static inline int xfrm_decode_session_reverse(struct sk_buff *skb, + struct flowi *fl, + unsigned int family) +{ + return -ENOSYS; +} +static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, + struct sk_buff *skb) +{ + return 1; +} +static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, + struct sk_buff *skb) +{ + return 1; +} +#endif + +static __inline__ +xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) +{ + switch (family){ + case AF_INET: + return (xfrm_address_t *)&fl->u.ip4.daddr; + case AF_INET6: + return (xfrm_address_t *)&fl->u.ip6.daddr; + } + return NULL; +} + +static __inline__ +xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) +{ + switch (family){ + case AF_INET: + return (xfrm_address_t *)&fl->u.ip4.saddr; + case AF_INET6: + return (xfrm_address_t *)&fl->u.ip6.saddr; + } + return NULL; +} + +static __inline__ +void xfrm_flowi_addr_get(const struct flowi *fl, + xfrm_address_t *saddr, xfrm_address_t *daddr, + unsigned short family) +{ + switch(family) { + case AF_INET: + memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); + memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); + break; + case AF_INET6: + *(struct in6_addr *)saddr->a6 = fl->u.ip6.saddr; + *(struct in6_addr *)daddr->a6 = fl->u.ip6.daddr; + break; + } +} + +static __inline__ int +__xfrm4_state_addr_check(const struct xfrm_state *x, + const xfrm_address_t *daddr, const 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(const struct xfrm_state *x, + const xfrm_address_t *daddr, const 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(const struct xfrm_state *x, + const xfrm_address_t *daddr, const 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(const struct xfrm_state *x, const struct flowi *fl, + unsigned short family) +{ + switch (family) { + case AF_INET: + return __xfrm4_state_addr_check(x, + (const xfrm_address_t *)&fl->u.ip4.daddr, + (const xfrm_address_t *)&fl->u.ip4.saddr); + case AF_INET6: + return __xfrm6_state_addr_check(x, + (const xfrm_address_t *)&fl->u.ip6.daddr, + (const xfrm_address_t *)&fl->u.ip6.saddr); + } + return 0; +} + +static inline int xfrm_state_kern(const 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_aead_info { + u16 icv_truncbits; +}; + +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_aead_info aead; + 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 __rcu *next; + int priority; +}; + +struct xfrm6_tunnel { + int (*handler)(struct sk_buff *skb); + int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, + u8 type, u8 code, int offset, __be32 info); + struct xfrm6_tunnel __rcu *next; + int priority; +}; + +extern void xfrm_init(void); +extern void xfrm4_init(int rt_hash_size); +extern int xfrm_state_init(struct net *net); +extern void xfrm_state_fini(struct net *net); +extern void xfrm4_state_init(void); +#ifdef CONFIG_XFRM +extern int xfrm6_init(void); +extern void xfrm6_fini(void); +extern int xfrm6_state_init(void); +extern void xfrm6_state_fini(void); +#else +static inline int xfrm6_init(void) +{ + return 0; +} +static inline void xfrm6_fini(void) +{ + ; +} +#endif + +#ifdef CONFIG_XFRM_STATISTICS +extern int xfrm_proc_init(struct net *net); +extern void xfrm_proc_fini(struct net *net); +#endif + +extern int xfrm_sysctl_init(struct net *net); +#ifdef CONFIG_SYSCTL +extern void xfrm_sysctl_fini(struct net *net); +#else +static inline void xfrm_sysctl_fini(struct net *net) +{ +} +#endif + +extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto); +extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, + int (*func)(struct xfrm_state *, int, void*), void *); +extern void xfrm_state_walk_done(struct xfrm_state_walk *walk); +extern struct xfrm_state *xfrm_state_alloc(struct net *net); +extern struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + const struct flowi *fl, + struct xfrm_tmpl *tmpl, + struct xfrm_policy *pol, int *err, + unsigned short family); +extern struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, + 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(struct net *net, u32 mark, + const xfrm_address_t *daddr, __be32 spi, + u8 proto, unsigned short family); +extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, + const xfrm_address_t *daddr, + const 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(struct net *net, u32 mark, + u32 seq); +extern int xfrm_state_delete(struct xfrm_state *x); +extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info); +extern void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); +extern void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); +extern u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); +extern int xfrm_init_replay(struct xfrm_state *x); +extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); +extern int __xfrm_init_state(struct xfrm_state *x, bool init_replay); +extern int xfrm_init_state(struct xfrm_state *x); +extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb); +extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, + int encap_type); +extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr); +extern int xfrm_output_resume(struct sk_buff *skb, int err); +extern int xfrm_output(struct sk_buff *skb); +extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb); +extern int xfrm4_extract_header(struct sk_buff *skb); +extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); +extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, + int encap_type); +extern int xfrm4_transport_finish(struct sk_buff *skb, int async); +extern int xfrm4_rcv(struct sk_buff *skb); + +static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) +{ + return xfrm4_rcv_encap(skb, nexthdr, spi, 0); +} + +extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb); +extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb); +extern int xfrm4_output(struct sk_buff *skb); +extern int xfrm4_output_finish(struct sk_buff *skb); +extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); +extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); +extern int xfrm6_extract_header(struct sk_buff *skb); +extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); +extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi); +extern int xfrm6_transport_finish(struct sk_buff *skb, int async); +extern int xfrm6_rcv(struct sk_buff *skb); +extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, + xfrm_address_t *saddr, u8 proto); +extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); +extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); +extern __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); +extern __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); +extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb); +extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb); +extern int xfrm6_output(struct sk_buff *skb); +extern int xfrm6_output_finish(struct sk_buff *skb); +extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, + u8 **prevhdr); + +#ifdef CONFIG_XFRM +extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); +extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); +#else +static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) +{ + return -ENOPROTOOPT; +} + +static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) +{ + /* should not happen */ + kfree_skb(skb); + return 0; +} +#endif + +struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); + +extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); +extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, + int (*func)(struct xfrm_policy *, int, int, void*), void *); +extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk); +int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); +struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, + u8 type, int dir, + struct xfrm_selector *sel, + struct xfrm_sec_ctx *ctx, int delete, + int *err); +struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir, u32 id, int delete, int *err); +int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info); +u32 xfrm_get_acqseq(void); +extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); +struct xfrm_state *xfrm_find_acq(struct net *net, struct xfrm_mark *mark, + u8 mode, u32 reqid, u8 proto, + const xfrm_address_t *daddr, + const xfrm_address_t *saddr, int create, + unsigned short family); +extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); + +#ifdef CONFIG_XFRM_MIGRATE +extern int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, + const struct xfrm_migrate *m, int num_bundles, + const struct xfrm_kmaddress *k); +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(const struct xfrm_selector *sel, u8 dir, u8 type, + struct xfrm_migrate *m, int num_bundles, + struct xfrm_kmaddress *k); +#endif + +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(struct net *net, 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(const char *name, int probe); +extern struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); +extern struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); +extern struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, + int probe); + +static inline int xfrm_addr_cmp(const xfrm_address_t *a, + const 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((const struct in6_addr *)a, + (const struct in6_addr *)b); + } +} + +static inline int xfrm_policy_id2dir(u32 index) +{ + return index & 7; +} + +#ifdef CONFIG_XFRM +static inline int xfrm_aevent_is_on(struct net *net) +{ + struct sock *nlsk; + int ret = 0; + + rcu_read_lock(); + nlsk = rcu_dereference(net->xfrm.nlsk); + if (nlsk) + ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); + rcu_read_unlock(); + return ret; +} +#endif + +static inline int xfrm_alg_len(const struct xfrm_algo *alg) +{ + return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); +} + +static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) +{ + return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); +} + +static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) +{ + return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); +} + +#ifdef CONFIG_XFRM_MIGRATE +static inline int xfrm_replay_clone(struct xfrm_state *x, + struct xfrm_state *orig) +{ + x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn), + GFP_KERNEL); + if (!x->replay_esn) + return -ENOMEM; + + x->replay_esn->bmp_len = orig->replay_esn->bmp_len; + x->replay_esn->replay_window = orig->replay_esn->replay_window; + + x->preplay_esn = kmemdup(x->replay_esn, + xfrm_replay_state_esn_len(x->replay_esn), + GFP_KERNEL); + if (!x->preplay_esn) { + kfree(x->replay_esn); + return -ENOMEM; + } + + return 0; +} + +static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) +{ + return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); +} + +static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) +{ + return kmemdup(orig, xfrm_alg_auth_len(orig), 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 + +#ifdef CONFIG_XFRM +static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) +{ + return skb->sp->xvec[skb->sp->len - 1]; +} +#endif + +static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) +{ + if (attrs[XFRMA_MARK]) + memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); + else + m->v = m->m = 0; + + return m->v & m->m; +} + +static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) +{ + if (m->m | m->v) + NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); + return 0; + +nla_put_failure: + return -1; +} + +#endif /* _NET_XFRM_H */ |