11da177e4SLinus Torvalds #ifndef _NET_XFRM_H 21da177e4SLinus Torvalds #define _NET_XFRM_H 31da177e4SLinus Torvalds 4aabc9761SHerbert Xu #include <linux/compiler.h> 514c85021SArnaldo Carvalho de Melo #include <linux/in.h> 61da177e4SLinus Torvalds #include <linux/xfrm.h> 71da177e4SLinus Torvalds #include <linux/spinlock.h> 81da177e4SLinus Torvalds #include <linux/list.h> 91da177e4SLinus Torvalds #include <linux/skbuff.h> 1014c85021SArnaldo Carvalho de Melo #include <linux/socket.h> 111da177e4SLinus Torvalds #include <linux/crypto.h> 121da177e4SLinus Torvalds #include <linux/pfkeyv2.h> 131da177e4SLinus Torvalds #include <linux/in6.h> 141da177e4SLinus Torvalds 151da177e4SLinus Torvalds #include <net/sock.h> 161da177e4SLinus Torvalds #include <net/dst.h> 171da177e4SLinus Torvalds #include <net/route.h> 181da177e4SLinus Torvalds #include <net/ipv6.h> 191da177e4SLinus Torvalds #include <net/ip6_fib.h> 201da177e4SLinus Torvalds 211da177e4SLinus Torvalds #define XFRM_ALIGN8(len) (((len) + 7) & ~7) 221da177e4SLinus Torvalds 231da177e4SLinus Torvalds extern struct semaphore xfrm_cfg_sem; 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds /* Organization of SPD aka "XFRM rules" 261da177e4SLinus Torvalds ------------------------------------ 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds Basic objects: 291da177e4SLinus Torvalds - policy rule, struct xfrm_policy (=SPD entry) 301da177e4SLinus Torvalds - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 311da177e4SLinus Torvalds - instance of a transformer, struct xfrm_state (=SA) 321da177e4SLinus Torvalds - template to clone xfrm_state, struct xfrm_tmpl 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds SPD is plain linear list of xfrm_policy rules, ordered by priority. 351da177e4SLinus Torvalds (To be compatible with existing pfkeyv2 implementations, 361da177e4SLinus Torvalds many rules with priority of 0x7fffffff are allowed to exist and 371da177e4SLinus Torvalds such rules are ordered in an unpredictable way, thanks to bsd folks.) 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds Lookup is plain linear search until the first match with selector. 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds If "action" is "block", then we prohibit the flow, otherwise: 421da177e4SLinus Torvalds if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 431da177e4SLinus Torvalds policy entry has list of up to XFRM_MAX_DEPTH transformations, 441da177e4SLinus Torvalds described by templates xfrm_tmpl. Each template is resolved 451da177e4SLinus Torvalds to a complete xfrm_state (see below) and we pack bundle of transformations 461da177e4SLinus Torvalds to a dst_entry returned to requestor. 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds dst -. xfrm .-> xfrm_state #1 491da177e4SLinus Torvalds |---. child .-> dst -. xfrm .-> xfrm_state #2 501da177e4SLinus Torvalds |---. child .-> dst -. xfrm .-> xfrm_state #3 511da177e4SLinus Torvalds |---. child .-> NULL 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds Bundles are cached at xrfm_policy struct (field ->bundles). 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds 561da177e4SLinus Torvalds Resolution of xrfm_tmpl 571da177e4SLinus Torvalds ----------------------- 581da177e4SLinus Torvalds Template contains: 591da177e4SLinus Torvalds 1. ->mode Mode: transport or tunnel 601da177e4SLinus Torvalds 2. ->id.proto Protocol: AH/ESP/IPCOMP 611da177e4SLinus Torvalds 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 621da177e4SLinus Torvalds Q: allow to resolve security gateway? 631da177e4SLinus Torvalds 4. ->id.spi If not zero, static SPI. 641da177e4SLinus Torvalds 5. ->saddr Local tunnel endpoint, ignored for transport mode. 651da177e4SLinus Torvalds 6. ->algos List of allowed algos. Plain bitmask now. 661da177e4SLinus Torvalds Q: ealgos, aalgos, calgos. What a mess... 671da177e4SLinus Torvalds 7. ->share Sharing mode. 681da177e4SLinus Torvalds Q: how to implement private sharing mode? To add struct sock* to 691da177e4SLinus Torvalds flow id? 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds Having this template we search through SAD searching for entries 721da177e4SLinus Torvalds with appropriate mode/proto/algo, permitted by selector. 731da177e4SLinus Torvalds If no appropriate entry found, it is requested from key manager. 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds PROBLEMS: 761da177e4SLinus Torvalds Q: How to find all the bundles referring to a physical path for 771da177e4SLinus Torvalds PMTU discovery? Seems, dst should contain list of all parents... 781da177e4SLinus Torvalds and enter to infinite locking hierarchy disaster. 791da177e4SLinus Torvalds No! It is easier, we will not search for them, let them find us. 801da177e4SLinus Torvalds We add genid to each dst plus pointer to genid of raw IP route, 811da177e4SLinus Torvalds pmtu disc will update pmtu on raw IP route and increase its genid. 821da177e4SLinus Torvalds dst_check() will see this for top level and trigger resyncing 831da177e4SLinus Torvalds metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 841da177e4SLinus Torvalds */ 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds /* Full description of state of transformer. */ 871da177e4SLinus Torvalds struct xfrm_state 881da177e4SLinus Torvalds { 891da177e4SLinus Torvalds /* Note: bydst is re-used during gc */ 901da177e4SLinus Torvalds struct list_head bydst; 911da177e4SLinus Torvalds struct list_head byspi; 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds atomic_t refcnt; 941da177e4SLinus Torvalds spinlock_t lock; 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds struct xfrm_id id; 971da177e4SLinus Torvalds struct xfrm_selector sel; 981da177e4SLinus Torvalds 991da177e4SLinus Torvalds /* Key manger bits */ 1001da177e4SLinus Torvalds struct { 1011da177e4SLinus Torvalds u8 state; 1021da177e4SLinus Torvalds u8 dying; 1031da177e4SLinus Torvalds u32 seq; 1041da177e4SLinus Torvalds } km; 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds /* Parameters of this state. */ 1071da177e4SLinus Torvalds struct { 1081da177e4SLinus Torvalds u32 reqid; 1091da177e4SLinus Torvalds u8 mode; 1101da177e4SLinus Torvalds u8 replay_window; 1111da177e4SLinus Torvalds u8 aalgo, ealgo, calgo; 1121da177e4SLinus Torvalds u8 flags; 1131da177e4SLinus Torvalds u16 family; 1141da177e4SLinus Torvalds xfrm_address_t saddr; 1151da177e4SLinus Torvalds int header_len; 1161da177e4SLinus Torvalds int trailer_len; 1171da177e4SLinus Torvalds } props; 1181da177e4SLinus Torvalds 1191da177e4SLinus Torvalds struct xfrm_lifetime_cfg lft; 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds /* Data for transformer */ 1221da177e4SLinus Torvalds struct xfrm_algo *aalg; 1231da177e4SLinus Torvalds struct xfrm_algo *ealg; 1241da177e4SLinus Torvalds struct xfrm_algo *calg; 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds /* Data for encapsulator */ 1271da177e4SLinus Torvalds struct xfrm_encap_tmpl *encap; 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 1301da177e4SLinus Torvalds struct xfrm_state *tunnel; 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds /* If a tunnel, number of users + 1 */ 1331da177e4SLinus Torvalds atomic_t tunnel_users; 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds /* State for replay detection */ 1361da177e4SLinus Torvalds struct xfrm_replay_state replay; 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds /* Statistics */ 1391da177e4SLinus Torvalds struct xfrm_stats stats; 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds struct xfrm_lifetime_cur curlft; 1421da177e4SLinus Torvalds struct timer_list timer; 1431da177e4SLinus Torvalds 1441da177e4SLinus Torvalds /* Reference to data common to all the instances of this 1451da177e4SLinus Torvalds * transformer. */ 1461da177e4SLinus Torvalds struct xfrm_type *type; 1471da177e4SLinus Torvalds 148df71837dSTrent Jaeger /* Security context */ 149df71837dSTrent Jaeger struct xfrm_sec_ctx *security; 150df71837dSTrent Jaeger 1511da177e4SLinus Torvalds /* Private data of this transformer, format is opaque, 1521da177e4SLinus Torvalds * interpreted by xfrm_type methods. */ 1531da177e4SLinus Torvalds void *data; 1541da177e4SLinus Torvalds }; 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds enum { 1571da177e4SLinus Torvalds XFRM_STATE_VOID, 1581da177e4SLinus Torvalds XFRM_STATE_ACQ, 1591da177e4SLinus Torvalds XFRM_STATE_VALID, 1601da177e4SLinus Torvalds XFRM_STATE_ERROR, 1611da177e4SLinus Torvalds XFRM_STATE_EXPIRED, 1621da177e4SLinus Torvalds XFRM_STATE_DEAD 1631da177e4SLinus Torvalds }; 1641da177e4SLinus Torvalds 16526b15dadSJamal Hadi Salim /* callback structure passed from either netlink or pfkey */ 16626b15dadSJamal Hadi Salim struct km_event 16726b15dadSJamal Hadi Salim { 168bf08867fSHerbert Xu union { 169bf08867fSHerbert Xu u32 hard; 170bf08867fSHerbert Xu u32 proto; 171bf08867fSHerbert Xu u32 byid; 172bf08867fSHerbert Xu } data; 173bf08867fSHerbert Xu 17426b15dadSJamal Hadi Salim u32 seq; 17526b15dadSJamal Hadi Salim u32 pid; 17626b15dadSJamal Hadi Salim u32 event; 17726b15dadSJamal Hadi Salim }; 17826b15dadSJamal Hadi Salim 1791da177e4SLinus Torvalds struct xfrm_type; 1801da177e4SLinus Torvalds struct xfrm_dst; 1811da177e4SLinus Torvalds struct xfrm_policy_afinfo { 1821da177e4SLinus Torvalds unsigned short family; 1831da177e4SLinus Torvalds rwlock_t lock; 1841da177e4SLinus Torvalds struct xfrm_type_map *type_map; 1851da177e4SLinus Torvalds struct dst_ops *dst_ops; 1861da177e4SLinus Torvalds void (*garbage_collect)(void); 1871da177e4SLinus Torvalds int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl); 1881da177e4SLinus Torvalds struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); 1891da177e4SLinus Torvalds int (*bundle_create)(struct xfrm_policy *policy, 1901da177e4SLinus Torvalds struct xfrm_state **xfrm, 1911da177e4SLinus Torvalds int nx, 1921da177e4SLinus Torvalds struct flowi *fl, 1931da177e4SLinus Torvalds struct dst_entry **dst_p); 1941da177e4SLinus Torvalds void (*decode_session)(struct sk_buff *skb, 1951da177e4SLinus Torvalds struct flowi *fl); 1961da177e4SLinus Torvalds }; 1971da177e4SLinus Torvalds 1981da177e4SLinus Torvalds extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); 1991da177e4SLinus Torvalds extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); 20026b15dadSJamal Hadi Salim extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c); 20126b15dadSJamal Hadi Salim extern void km_state_notify(struct xfrm_state *x, struct km_event *c); 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds #define XFRM_ACQ_EXPIRES 30 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds struct xfrm_tmpl; 2061da177e4SLinus Torvalds struct xfrm_state_afinfo { 2071da177e4SLinus Torvalds unsigned short family; 2081da177e4SLinus Torvalds rwlock_t lock; 2091da177e4SLinus Torvalds struct list_head *state_bydst; 2101da177e4SLinus Torvalds struct list_head *state_byspi; 211d094cd83SHerbert Xu int (*init_flags)(struct xfrm_state *x); 2121da177e4SLinus Torvalds void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, 2131da177e4SLinus Torvalds struct xfrm_tmpl *tmpl, 2141da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr); 2151da177e4SLinus Torvalds struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto); 2161da177e4SLinus Torvalds struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto, 2171da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr, 2181da177e4SLinus Torvalds int create); 2191da177e4SLinus Torvalds }; 2201da177e4SLinus Torvalds 2211da177e4SLinus Torvalds extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 2221da177e4SLinus Torvalds extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds extern void xfrm_state_delete_tunnel(struct xfrm_state *x); 2251da177e4SLinus Torvalds 2261da177e4SLinus Torvalds struct xfrm_decap_state; 2271da177e4SLinus Torvalds struct xfrm_type 2281da177e4SLinus Torvalds { 2291da177e4SLinus Torvalds char *description; 2301da177e4SLinus Torvalds struct module *owner; 2311da177e4SLinus Torvalds __u8 proto; 2321da177e4SLinus Torvalds 23372cb6962SHerbert Xu int (*init_state)(struct xfrm_state *x); 2341da177e4SLinus Torvalds void (*destructor)(struct xfrm_state *); 2351da177e4SLinus Torvalds int (*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb); 2361da177e4SLinus Torvalds int (*post_input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb); 2371da177e4SLinus Torvalds int (*output)(struct xfrm_state *, struct sk_buff *pskb); 2381da177e4SLinus Torvalds /* Estimate maximal size of result of transformation of a dgram */ 2391da177e4SLinus Torvalds u32 (*get_max_size)(struct xfrm_state *, int size); 2401da177e4SLinus Torvalds }; 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds struct xfrm_type_map { 2431da177e4SLinus Torvalds rwlock_t lock; 2441da177e4SLinus Torvalds struct xfrm_type *map[256]; 2451da177e4SLinus Torvalds }; 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds extern int xfrm_register_type(struct xfrm_type *type, unsigned short family); 2481da177e4SLinus Torvalds extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family); 2491da177e4SLinus Torvalds extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family); 2501da177e4SLinus Torvalds extern void xfrm_put_type(struct xfrm_type *type); 2511da177e4SLinus Torvalds 2521da177e4SLinus Torvalds struct xfrm_tmpl 2531da177e4SLinus Torvalds { 2541da177e4SLinus Torvalds /* id in template is interpreted as: 2551da177e4SLinus Torvalds * daddr - destination of tunnel, may be zero for transport mode. 2561da177e4SLinus Torvalds * spi - zero to acquire spi. Not zero if spi is static, then 2571da177e4SLinus Torvalds * daddr must be fixed too. 2581da177e4SLinus Torvalds * proto - AH/ESP/IPCOMP 2591da177e4SLinus Torvalds */ 2601da177e4SLinus Torvalds struct xfrm_id id; 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvalds /* Source address of tunnel. Ignored, if it is not a tunnel. */ 2631da177e4SLinus Torvalds xfrm_address_t saddr; 2641da177e4SLinus Torvalds 2651da177e4SLinus Torvalds __u32 reqid; 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds /* Mode: transport/tunnel */ 2681da177e4SLinus Torvalds __u8 mode; 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvalds /* Sharing mode: unique, this session only, this user only etc. */ 2711da177e4SLinus Torvalds __u8 share; 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds /* May skip this transfomration if no SA is found */ 2741da177e4SLinus Torvalds __u8 optional; 2751da177e4SLinus Torvalds 2761da177e4SLinus Torvalds /* Bit mask of algos allowed for acquisition */ 2771da177e4SLinus Torvalds __u32 aalgos; 2781da177e4SLinus Torvalds __u32 ealgos; 2791da177e4SLinus Torvalds __u32 calgos; 2801da177e4SLinus Torvalds }; 2811da177e4SLinus Torvalds 2821da177e4SLinus Torvalds #define XFRM_MAX_DEPTH 4 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds struct xfrm_policy 2851da177e4SLinus Torvalds { 2861da177e4SLinus Torvalds struct xfrm_policy *next; 2871da177e4SLinus Torvalds struct list_head list; 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds /* This lock only affects elements except for entry. */ 2901da177e4SLinus Torvalds rwlock_t lock; 2911da177e4SLinus Torvalds atomic_t refcnt; 2921da177e4SLinus Torvalds struct timer_list timer; 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvalds u32 priority; 2951da177e4SLinus Torvalds u32 index; 2961da177e4SLinus Torvalds struct xfrm_selector selector; 2971da177e4SLinus Torvalds struct xfrm_lifetime_cfg lft; 2981da177e4SLinus Torvalds struct xfrm_lifetime_cur curlft; 2991da177e4SLinus Torvalds struct dst_entry *bundles; 3001da177e4SLinus Torvalds __u16 family; 3011da177e4SLinus Torvalds __u8 action; 3021da177e4SLinus Torvalds __u8 flags; 3031da177e4SLinus Torvalds __u8 dead; 3041da177e4SLinus Torvalds __u8 xfrm_nr; 305df71837dSTrent Jaeger struct xfrm_sec_ctx *security; 3061da177e4SLinus Torvalds struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 3071da177e4SLinus Torvalds }; 3081da177e4SLinus Torvalds 3091da177e4SLinus Torvalds #define XFRM_KM_TIMEOUT 30 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds struct xfrm_mgr 3121da177e4SLinus Torvalds { 3131da177e4SLinus Torvalds struct list_head list; 3141da177e4SLinus Torvalds char *id; 31526b15dadSJamal Hadi Salim int (*notify)(struct xfrm_state *x, struct km_event *c); 3161da177e4SLinus Torvalds int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); 3171da177e4SLinus Torvalds struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir); 3181da177e4SLinus Torvalds int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport); 31926b15dadSJamal Hadi Salim int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); 3201da177e4SLinus Torvalds }; 3211da177e4SLinus Torvalds 3221da177e4SLinus Torvalds extern int xfrm_register_km(struct xfrm_mgr *km); 3231da177e4SLinus Torvalds extern int xfrm_unregister_km(struct xfrm_mgr *km); 3241da177e4SLinus Torvalds 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvalds extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2]; 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds static inline void xfrm_pol_hold(struct xfrm_policy *policy) 3291da177e4SLinus Torvalds { 3301da177e4SLinus Torvalds if (likely(policy != NULL)) 3311da177e4SLinus Torvalds atomic_inc(&policy->refcnt); 3321da177e4SLinus Torvalds } 3331da177e4SLinus Torvalds 3341da177e4SLinus Torvalds extern void __xfrm_policy_destroy(struct xfrm_policy *policy); 3351da177e4SLinus Torvalds 3361da177e4SLinus Torvalds static inline void xfrm_pol_put(struct xfrm_policy *policy) 3371da177e4SLinus Torvalds { 3381da177e4SLinus Torvalds if (atomic_dec_and_test(&policy->refcnt)) 3391da177e4SLinus Torvalds __xfrm_policy_destroy(policy); 3401da177e4SLinus Torvalds } 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds #define XFRM_DST_HSIZE 1024 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds static __inline__ 3451da177e4SLinus Torvalds unsigned __xfrm4_dst_hash(xfrm_address_t *addr) 3461da177e4SLinus Torvalds { 3471da177e4SLinus Torvalds unsigned h; 3481da177e4SLinus Torvalds h = ntohl(addr->a4); 3491da177e4SLinus Torvalds h = (h ^ (h>>16)) % XFRM_DST_HSIZE; 3501da177e4SLinus Torvalds return h; 3511da177e4SLinus Torvalds } 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds static __inline__ 3541da177e4SLinus Torvalds unsigned __xfrm6_dst_hash(xfrm_address_t *addr) 3551da177e4SLinus Torvalds { 3561da177e4SLinus Torvalds unsigned h; 3571da177e4SLinus Torvalds h = ntohl(addr->a6[2]^addr->a6[3]); 3581da177e4SLinus Torvalds h = (h ^ (h>>16)) % XFRM_DST_HSIZE; 3591da177e4SLinus Torvalds return h; 3601da177e4SLinus Torvalds } 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds static __inline__ 3631da177e4SLinus Torvalds unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family) 3641da177e4SLinus Torvalds { 3651da177e4SLinus Torvalds switch (family) { 3661da177e4SLinus Torvalds case AF_INET: 3671da177e4SLinus Torvalds return __xfrm4_dst_hash(addr); 3681da177e4SLinus Torvalds case AF_INET6: 3691da177e4SLinus Torvalds return __xfrm6_dst_hash(addr); 3701da177e4SLinus Torvalds } 3711da177e4SLinus Torvalds return 0; 3721da177e4SLinus Torvalds } 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds static __inline__ 3751da177e4SLinus Torvalds unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto) 3761da177e4SLinus Torvalds { 3771da177e4SLinus Torvalds unsigned h; 3781da177e4SLinus Torvalds h = ntohl(addr->a4^spi^proto); 3791da177e4SLinus Torvalds h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE; 3801da177e4SLinus Torvalds return h; 3811da177e4SLinus Torvalds } 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds static __inline__ 3841da177e4SLinus Torvalds unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto) 3851da177e4SLinus Torvalds { 3861da177e4SLinus Torvalds unsigned h; 3871da177e4SLinus Torvalds h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto); 3881da177e4SLinus Torvalds h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE; 3891da177e4SLinus Torvalds return h; 3901da177e4SLinus Torvalds } 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds static __inline__ 3931da177e4SLinus Torvalds unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family) 3941da177e4SLinus Torvalds { 3951da177e4SLinus Torvalds switch (family) { 3961da177e4SLinus Torvalds case AF_INET: 3971da177e4SLinus Torvalds return __xfrm4_spi_hash(addr, spi, proto); 3981da177e4SLinus Torvalds case AF_INET6: 3991da177e4SLinus Torvalds return __xfrm6_spi_hash(addr, spi, proto); 4001da177e4SLinus Torvalds } 4011da177e4SLinus Torvalds return 0; /*XXX*/ 4021da177e4SLinus Torvalds } 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds extern void __xfrm_state_destroy(struct xfrm_state *); 4051da177e4SLinus Torvalds 406*21380b81SHerbert Xu static inline void __xfrm_state_put(struct xfrm_state *x) 407*21380b81SHerbert Xu { 408*21380b81SHerbert Xu atomic_dec(&x->refcnt); 409*21380b81SHerbert Xu } 410*21380b81SHerbert Xu 4111da177e4SLinus Torvalds static inline void xfrm_state_put(struct xfrm_state *x) 4121da177e4SLinus Torvalds { 4131da177e4SLinus Torvalds if (atomic_dec_and_test(&x->refcnt)) 4141da177e4SLinus Torvalds __xfrm_state_destroy(x); 4151da177e4SLinus Torvalds } 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds static inline void xfrm_state_hold(struct xfrm_state *x) 4181da177e4SLinus Torvalds { 4191da177e4SLinus Torvalds atomic_inc(&x->refcnt); 4201da177e4SLinus Torvalds } 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds static __inline__ int addr_match(void *token1, void *token2, int prefixlen) 4231da177e4SLinus Torvalds { 4241da177e4SLinus Torvalds __u32 *a1 = token1; 4251da177e4SLinus Torvalds __u32 *a2 = token2; 4261da177e4SLinus Torvalds int pdw; 4271da177e4SLinus Torvalds int pbi; 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ 4301da177e4SLinus Torvalds pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds if (pdw) 4331da177e4SLinus Torvalds if (memcmp(a1, a2, pdw << 2)) 4341da177e4SLinus Torvalds return 0; 4351da177e4SLinus Torvalds 4361da177e4SLinus Torvalds if (pbi) { 4371da177e4SLinus Torvalds __u32 mask; 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds mask = htonl((0xffffffff) << (32 - pbi)); 4401da177e4SLinus Torvalds 4411da177e4SLinus Torvalds if ((a1[pdw] ^ a2[pdw]) & mask) 4421da177e4SLinus Torvalds return 0; 4431da177e4SLinus Torvalds } 4441da177e4SLinus Torvalds 4451da177e4SLinus Torvalds return 1; 4461da177e4SLinus Torvalds } 4471da177e4SLinus Torvalds 4481da177e4SLinus Torvalds static __inline__ 4491da177e4SLinus Torvalds u16 xfrm_flowi_sport(struct flowi *fl) 4501da177e4SLinus Torvalds { 4511da177e4SLinus Torvalds u16 port; 4521da177e4SLinus Torvalds switch(fl->proto) { 4531da177e4SLinus Torvalds case IPPROTO_TCP: 4541da177e4SLinus Torvalds case IPPROTO_UDP: 4551da177e4SLinus Torvalds case IPPROTO_SCTP: 4561da177e4SLinus Torvalds port = fl->fl_ip_sport; 4571da177e4SLinus Torvalds break; 4581da177e4SLinus Torvalds case IPPROTO_ICMP: 4591da177e4SLinus Torvalds case IPPROTO_ICMPV6: 4601da177e4SLinus Torvalds port = htons(fl->fl_icmp_type); 4611da177e4SLinus Torvalds break; 4621da177e4SLinus Torvalds default: 4631da177e4SLinus Torvalds port = 0; /*XXX*/ 4641da177e4SLinus Torvalds } 4651da177e4SLinus Torvalds return port; 4661da177e4SLinus Torvalds } 4671da177e4SLinus Torvalds 4681da177e4SLinus Torvalds static __inline__ 4691da177e4SLinus Torvalds u16 xfrm_flowi_dport(struct flowi *fl) 4701da177e4SLinus Torvalds { 4711da177e4SLinus Torvalds u16 port; 4721da177e4SLinus Torvalds switch(fl->proto) { 4731da177e4SLinus Torvalds case IPPROTO_TCP: 4741da177e4SLinus Torvalds case IPPROTO_UDP: 4751da177e4SLinus Torvalds case IPPROTO_SCTP: 4761da177e4SLinus Torvalds port = fl->fl_ip_dport; 4771da177e4SLinus Torvalds break; 4781da177e4SLinus Torvalds case IPPROTO_ICMP: 4791da177e4SLinus Torvalds case IPPROTO_ICMPV6: 4801da177e4SLinus Torvalds port = htons(fl->fl_icmp_code); 4811da177e4SLinus Torvalds break; 4821da177e4SLinus Torvalds default: 4831da177e4SLinus Torvalds port = 0; /*XXX*/ 4841da177e4SLinus Torvalds } 4851da177e4SLinus Torvalds return port; 4861da177e4SLinus Torvalds } 4871da177e4SLinus Torvalds 4881da177e4SLinus Torvalds static inline int 4891da177e4SLinus Torvalds __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) 4901da177e4SLinus Torvalds { 4911da177e4SLinus Torvalds return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && 4921da177e4SLinus Torvalds addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && 4931da177e4SLinus Torvalds !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && 4941da177e4SLinus Torvalds !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && 4951da177e4SLinus Torvalds (fl->proto == sel->proto || !sel->proto) && 4961da177e4SLinus Torvalds (fl->oif == sel->ifindex || !sel->ifindex); 4971da177e4SLinus Torvalds } 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds static inline int 5001da177e4SLinus Torvalds __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) 5011da177e4SLinus Torvalds { 5021da177e4SLinus Torvalds return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && 5031da177e4SLinus Torvalds addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && 5041da177e4SLinus Torvalds !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && 5051da177e4SLinus Torvalds !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && 5061da177e4SLinus Torvalds (fl->proto == sel->proto || !sel->proto) && 5071da177e4SLinus Torvalds (fl->oif == sel->ifindex || !sel->ifindex); 5081da177e4SLinus Torvalds } 5091da177e4SLinus Torvalds 5101da177e4SLinus Torvalds static inline int 5111da177e4SLinus Torvalds xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, 5121da177e4SLinus Torvalds unsigned short family) 5131da177e4SLinus Torvalds { 5141da177e4SLinus Torvalds switch (family) { 5151da177e4SLinus Torvalds case AF_INET: 5161da177e4SLinus Torvalds return __xfrm4_selector_match(sel, fl); 5171da177e4SLinus Torvalds case AF_INET6: 5181da177e4SLinus Torvalds return __xfrm6_selector_match(sel, fl); 5191da177e4SLinus Torvalds } 5201da177e4SLinus Torvalds return 0; 5211da177e4SLinus Torvalds } 5221da177e4SLinus Torvalds 523df71837dSTrent Jaeger #ifdef CONFIG_SECURITY_NETWORK_XFRM 524df71837dSTrent Jaeger /* If neither has a context --> match 525df71837dSTrent Jaeger * Otherwise, both must have a context and the sids, doi, alg must match 526df71837dSTrent Jaeger */ 527df71837dSTrent Jaeger static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 528df71837dSTrent Jaeger { 529df71837dSTrent Jaeger return ((!s1 && !s2) || 530df71837dSTrent Jaeger (s1 && s2 && 531df71837dSTrent Jaeger (s1->ctx_sid == s2->ctx_sid) && 532df71837dSTrent Jaeger (s1->ctx_doi == s2->ctx_doi) && 533df71837dSTrent Jaeger (s1->ctx_alg == s2->ctx_alg))); 534df71837dSTrent Jaeger } 535df71837dSTrent Jaeger #else 536df71837dSTrent Jaeger static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 537df71837dSTrent Jaeger { 538df71837dSTrent Jaeger return 1; 539df71837dSTrent Jaeger } 540df71837dSTrent Jaeger #endif 541df71837dSTrent Jaeger 5421da177e4SLinus Torvalds /* A struct encoding bundle of transformations to apply to some set of flow. 5431da177e4SLinus Torvalds * 5441da177e4SLinus Torvalds * dst->child points to the next element of bundle. 5451da177e4SLinus Torvalds * dst->xfrm points to an instanse of transformer. 5461da177e4SLinus Torvalds * 5471da177e4SLinus Torvalds * Due to unfortunate limitations of current routing cache, which we 5481da177e4SLinus Torvalds * have no time to fix, it mirrors struct rtable and bound to the same 5491da177e4SLinus Torvalds * routing key, including saddr,daddr. However, we can have many of 5501da177e4SLinus Torvalds * bundles differing by session id. All the bundles grow from a parent 5511da177e4SLinus Torvalds * policy rule. 5521da177e4SLinus Torvalds */ 5531da177e4SLinus Torvalds struct xfrm_dst 5541da177e4SLinus Torvalds { 5551da177e4SLinus Torvalds union { 5561da177e4SLinus Torvalds struct xfrm_dst *next; 5571da177e4SLinus Torvalds struct dst_entry dst; 5581da177e4SLinus Torvalds struct rtable rt; 5591da177e4SLinus Torvalds struct rt6_info rt6; 5601da177e4SLinus Torvalds } u; 5611da177e4SLinus Torvalds struct dst_entry *route; 5621da177e4SLinus Torvalds u32 route_mtu_cached; 5631da177e4SLinus Torvalds u32 child_mtu_cached; 56492d63decSHideaki YOSHIFUJI u32 route_cookie; 56592d63decSHideaki YOSHIFUJI u32 path_cookie; 5661da177e4SLinus Torvalds }; 5671da177e4SLinus Torvalds 568aabc9761SHerbert Xu static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 569aabc9761SHerbert Xu { 570aabc9761SHerbert Xu dst_release(xdst->route); 571aabc9761SHerbert Xu if (likely(xdst->u.dst.xfrm)) 572aabc9761SHerbert Xu xfrm_state_put(xdst->u.dst.xfrm); 573aabc9761SHerbert Xu } 574aabc9761SHerbert Xu 575aabc9761SHerbert Xu extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 576aabc9761SHerbert Xu 5771da177e4SLinus Torvalds /* Decapsulation state, used by the input to store data during 5781da177e4SLinus Torvalds * decapsulation procedure, to be used later (during the policy 5791da177e4SLinus Torvalds * check 5801da177e4SLinus Torvalds */ 5811da177e4SLinus Torvalds struct xfrm_decap_state { 5821da177e4SLinus Torvalds char decap_data[20]; 5831da177e4SLinus Torvalds __u16 decap_type; 5841da177e4SLinus Torvalds }; 5851da177e4SLinus Torvalds 5861da177e4SLinus Torvalds struct sec_decap_state { 5871da177e4SLinus Torvalds struct xfrm_state *xvec; 5881da177e4SLinus Torvalds struct xfrm_decap_state decap; 5891da177e4SLinus Torvalds }; 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds struct sec_path 5921da177e4SLinus Torvalds { 5931da177e4SLinus Torvalds atomic_t refcnt; 5941da177e4SLinus Torvalds int len; 5951da177e4SLinus Torvalds struct sec_decap_state x[XFRM_MAX_DEPTH]; 5961da177e4SLinus Torvalds }; 5971da177e4SLinus Torvalds 5981da177e4SLinus Torvalds static inline struct sec_path * 5991da177e4SLinus Torvalds secpath_get(struct sec_path *sp) 6001da177e4SLinus Torvalds { 6011da177e4SLinus Torvalds if (sp) 6021da177e4SLinus Torvalds atomic_inc(&sp->refcnt); 6031da177e4SLinus Torvalds return sp; 6041da177e4SLinus Torvalds } 6051da177e4SLinus Torvalds 6061da177e4SLinus Torvalds extern void __secpath_destroy(struct sec_path *sp); 6071da177e4SLinus Torvalds 6081da177e4SLinus Torvalds static inline void 6091da177e4SLinus Torvalds secpath_put(struct sec_path *sp) 6101da177e4SLinus Torvalds { 6111da177e4SLinus Torvalds if (sp && atomic_dec_and_test(&sp->refcnt)) 6121da177e4SLinus Torvalds __secpath_destroy(sp); 6131da177e4SLinus Torvalds } 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds extern struct sec_path *secpath_dup(struct sec_path *src); 6161da177e4SLinus Torvalds 6171da177e4SLinus Torvalds static inline void 6181da177e4SLinus Torvalds secpath_reset(struct sk_buff *skb) 6191da177e4SLinus Torvalds { 6201da177e4SLinus Torvalds #ifdef CONFIG_XFRM 6211da177e4SLinus Torvalds secpath_put(skb->sp); 6221da177e4SLinus Torvalds skb->sp = NULL; 6231da177e4SLinus Torvalds #endif 6241da177e4SLinus Torvalds } 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds static inline int 6271da177e4SLinus Torvalds __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 6281da177e4SLinus Torvalds { 6291da177e4SLinus Torvalds return (tmpl->saddr.a4 && 6301da177e4SLinus Torvalds tmpl->saddr.a4 != x->props.saddr.a4); 6311da177e4SLinus Torvalds } 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds static inline int 6341da177e4SLinus Torvalds __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 6351da177e4SLinus Torvalds { 6361da177e4SLinus Torvalds return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 6371da177e4SLinus Torvalds ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 6381da177e4SLinus Torvalds } 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvalds static inline int 6411da177e4SLinus Torvalds xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) 6421da177e4SLinus Torvalds { 6431da177e4SLinus Torvalds switch (family) { 6441da177e4SLinus Torvalds case AF_INET: 6451da177e4SLinus Torvalds return __xfrm4_state_addr_cmp(tmpl, x); 6461da177e4SLinus Torvalds case AF_INET6: 6471da177e4SLinus Torvalds return __xfrm6_state_addr_cmp(tmpl, x); 6481da177e4SLinus Torvalds } 6491da177e4SLinus Torvalds return !0; 6501da177e4SLinus Torvalds } 6511da177e4SLinus Torvalds 6521da177e4SLinus Torvalds #ifdef CONFIG_XFRM 6531da177e4SLinus Torvalds 6541da177e4SLinus Torvalds extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); 6551da177e4SLinus Torvalds 6561da177e4SLinus Torvalds static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 6571da177e4SLinus Torvalds { 6581da177e4SLinus Torvalds if (sk && sk->sk_policy[XFRM_POLICY_IN]) 6591da177e4SLinus Torvalds return __xfrm_policy_check(sk, dir, skb, family); 6601da177e4SLinus Torvalds 6611da177e4SLinus Torvalds return (!xfrm_policy_list[dir] && !skb->sp) || 6621da177e4SLinus Torvalds (skb->dst->flags & DST_NOPOLICY) || 6631da177e4SLinus Torvalds __xfrm_policy_check(sk, dir, skb, family); 6641da177e4SLinus Torvalds } 6651da177e4SLinus Torvalds 6661da177e4SLinus Torvalds static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 6671da177e4SLinus Torvalds { 6681da177e4SLinus Torvalds return xfrm_policy_check(sk, dir, skb, AF_INET); 6691da177e4SLinus Torvalds } 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 6721da177e4SLinus Torvalds { 6731da177e4SLinus Torvalds return xfrm_policy_check(sk, dir, skb, AF_INET6); 6741da177e4SLinus Torvalds } 6751da177e4SLinus Torvalds 6763e3850e9SPatrick McHardy extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family); 6771da177e4SLinus Torvalds extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 6781da177e4SLinus Torvalds 6791da177e4SLinus Torvalds static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 6801da177e4SLinus Torvalds { 6811da177e4SLinus Torvalds return !xfrm_policy_list[XFRM_POLICY_OUT] || 6821da177e4SLinus Torvalds (skb->dst->flags & DST_NOXFRM) || 6831da177e4SLinus Torvalds __xfrm_route_forward(skb, family); 6841da177e4SLinus Torvalds } 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds static inline int xfrm4_route_forward(struct sk_buff *skb) 6871da177e4SLinus Torvalds { 6881da177e4SLinus Torvalds return xfrm_route_forward(skb, AF_INET); 6891da177e4SLinus Torvalds } 6901da177e4SLinus Torvalds 6911da177e4SLinus Torvalds static inline int xfrm6_route_forward(struct sk_buff *skb) 6921da177e4SLinus Torvalds { 6931da177e4SLinus Torvalds return xfrm_route_forward(skb, AF_INET6); 6941da177e4SLinus Torvalds } 6951da177e4SLinus Torvalds 6961da177e4SLinus Torvalds extern int __xfrm_sk_clone_policy(struct sock *sk); 6971da177e4SLinus Torvalds 6981da177e4SLinus Torvalds static inline int xfrm_sk_clone_policy(struct sock *sk) 6991da177e4SLinus Torvalds { 7001da177e4SLinus Torvalds if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) 7011da177e4SLinus Torvalds return __xfrm_sk_clone_policy(sk); 7021da177e4SLinus Torvalds return 0; 7031da177e4SLinus Torvalds } 7041da177e4SLinus Torvalds 7054666faabSHerbert Xu extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 7061da177e4SLinus Torvalds 7071da177e4SLinus Torvalds static inline void xfrm_sk_free_policy(struct sock *sk) 7081da177e4SLinus Torvalds { 7091da177e4SLinus Torvalds if (unlikely(sk->sk_policy[0] != NULL)) { 7101da177e4SLinus Torvalds xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); 7111da177e4SLinus Torvalds sk->sk_policy[0] = NULL; 7121da177e4SLinus Torvalds } 7131da177e4SLinus Torvalds if (unlikely(sk->sk_policy[1] != NULL)) { 7141da177e4SLinus Torvalds xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); 7151da177e4SLinus Torvalds sk->sk_policy[1] = NULL; 7161da177e4SLinus Torvalds } 7171da177e4SLinus Torvalds } 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds #else 7201da177e4SLinus Torvalds 7211da177e4SLinus Torvalds static inline void xfrm_sk_free_policy(struct sock *sk) {} 7221da177e4SLinus Torvalds static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } 7231da177e4SLinus Torvalds static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 7241da177e4SLinus Torvalds static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 7251da177e4SLinus Torvalds static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 7261da177e4SLinus Torvalds { 7271da177e4SLinus Torvalds return 1; 7281da177e4SLinus Torvalds } 7291da177e4SLinus Torvalds static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 7301da177e4SLinus Torvalds { 7311da177e4SLinus Torvalds return 1; 7321da177e4SLinus Torvalds } 7331da177e4SLinus Torvalds static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 7341da177e4SLinus Torvalds { 7351da177e4SLinus Torvalds return 1; 7361da177e4SLinus Torvalds } 7371da177e4SLinus Torvalds #endif 7381da177e4SLinus Torvalds 7391da177e4SLinus Torvalds static __inline__ 7401da177e4SLinus Torvalds xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) 7411da177e4SLinus Torvalds { 7421da177e4SLinus Torvalds switch (family){ 7431da177e4SLinus Torvalds case AF_INET: 7441da177e4SLinus Torvalds return (xfrm_address_t *)&fl->fl4_dst; 7451da177e4SLinus Torvalds case AF_INET6: 7461da177e4SLinus Torvalds return (xfrm_address_t *)&fl->fl6_dst; 7471da177e4SLinus Torvalds } 7481da177e4SLinus Torvalds return NULL; 7491da177e4SLinus Torvalds } 7501da177e4SLinus Torvalds 7511da177e4SLinus Torvalds static __inline__ 7521da177e4SLinus Torvalds xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) 7531da177e4SLinus Torvalds { 7541da177e4SLinus Torvalds switch (family){ 7551da177e4SLinus Torvalds case AF_INET: 7561da177e4SLinus Torvalds return (xfrm_address_t *)&fl->fl4_src; 7571da177e4SLinus Torvalds case AF_INET6: 7581da177e4SLinus Torvalds return (xfrm_address_t *)&fl->fl6_src; 7591da177e4SLinus Torvalds } 7601da177e4SLinus Torvalds return NULL; 7611da177e4SLinus Torvalds } 7621da177e4SLinus Torvalds 7631da177e4SLinus Torvalds static __inline__ int 7641da177e4SLinus Torvalds __xfrm4_state_addr_check(struct xfrm_state *x, 7651da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr) 7661da177e4SLinus Torvalds { 7671da177e4SLinus Torvalds if (daddr->a4 == x->id.daddr.a4 && 7681da177e4SLinus Torvalds (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 7691da177e4SLinus Torvalds return 1; 7701da177e4SLinus Torvalds return 0; 7711da177e4SLinus Torvalds } 7721da177e4SLinus Torvalds 7731da177e4SLinus Torvalds static __inline__ int 7741da177e4SLinus Torvalds __xfrm6_state_addr_check(struct xfrm_state *x, 7751da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr) 7761da177e4SLinus Torvalds { 7771da177e4SLinus Torvalds if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 7781da177e4SLinus Torvalds (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| 7791da177e4SLinus Torvalds ipv6_addr_any((struct in6_addr *)saddr) || 7801da177e4SLinus Torvalds ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 7811da177e4SLinus Torvalds return 1; 7821da177e4SLinus Torvalds return 0; 7831da177e4SLinus Torvalds } 7841da177e4SLinus Torvalds 7851da177e4SLinus Torvalds static __inline__ int 7861da177e4SLinus Torvalds xfrm_state_addr_check(struct xfrm_state *x, 7871da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr, 7881da177e4SLinus Torvalds unsigned short family) 7891da177e4SLinus Torvalds { 7901da177e4SLinus Torvalds switch (family) { 7911da177e4SLinus Torvalds case AF_INET: 7921da177e4SLinus Torvalds return __xfrm4_state_addr_check(x, daddr, saddr); 7931da177e4SLinus Torvalds case AF_INET6: 7941da177e4SLinus Torvalds return __xfrm6_state_addr_check(x, daddr, saddr); 7951da177e4SLinus Torvalds } 7961da177e4SLinus Torvalds return 0; 7971da177e4SLinus Torvalds } 7981da177e4SLinus Torvalds 7991da177e4SLinus Torvalds static inline int xfrm_state_kern(struct xfrm_state *x) 8001da177e4SLinus Torvalds { 8011da177e4SLinus Torvalds return atomic_read(&x->tunnel_users); 8021da177e4SLinus Torvalds } 8031da177e4SLinus Torvalds 8041da177e4SLinus Torvalds /* 8051da177e4SLinus Torvalds * xfrm algorithm information 8061da177e4SLinus Torvalds */ 8071da177e4SLinus Torvalds struct xfrm_algo_auth_info { 8081da177e4SLinus Torvalds u16 icv_truncbits; 8091da177e4SLinus Torvalds u16 icv_fullbits; 8101da177e4SLinus Torvalds }; 8111da177e4SLinus Torvalds 8121da177e4SLinus Torvalds struct xfrm_algo_encr_info { 8131da177e4SLinus Torvalds u16 blockbits; 8141da177e4SLinus Torvalds u16 defkeybits; 8151da177e4SLinus Torvalds }; 8161da177e4SLinus Torvalds 8171da177e4SLinus Torvalds struct xfrm_algo_comp_info { 8181da177e4SLinus Torvalds u16 threshold; 8191da177e4SLinus Torvalds }; 8201da177e4SLinus Torvalds 8211da177e4SLinus Torvalds struct xfrm_algo_desc { 8221da177e4SLinus Torvalds char *name; 8231da177e4SLinus Torvalds u8 available:1; 8241da177e4SLinus Torvalds union { 8251da177e4SLinus Torvalds struct xfrm_algo_auth_info auth; 8261da177e4SLinus Torvalds struct xfrm_algo_encr_info encr; 8271da177e4SLinus Torvalds struct xfrm_algo_comp_info comp; 8281da177e4SLinus Torvalds } uinfo; 8291da177e4SLinus Torvalds struct sadb_alg desc; 8301da177e4SLinus Torvalds }; 8311da177e4SLinus Torvalds 8321da177e4SLinus Torvalds /* XFRM tunnel handlers. */ 8331da177e4SLinus Torvalds struct xfrm_tunnel { 8341da177e4SLinus Torvalds int (*handler)(struct sk_buff *skb); 8350303770dSPatrick McHardy void (*err_handler)(struct sk_buff *skb, __u32 info); 8361da177e4SLinus Torvalds }; 8371da177e4SLinus Torvalds 8381da177e4SLinus Torvalds struct xfrm6_tunnel { 839951dbc8aSPatrick McHardy int (*handler)(struct sk_buff **pskb); 8401da177e4SLinus Torvalds void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 8411da177e4SLinus Torvalds int type, int code, int offset, __u32 info); 8421da177e4SLinus Torvalds }; 8431da177e4SLinus Torvalds 8441da177e4SLinus Torvalds extern void xfrm_init(void); 8451da177e4SLinus Torvalds extern void xfrm4_init(void); 8461da177e4SLinus Torvalds extern void xfrm6_init(void); 8471da177e4SLinus Torvalds extern void xfrm6_fini(void); 8481da177e4SLinus Torvalds extern void xfrm_state_init(void); 8491da177e4SLinus Torvalds extern void xfrm4_state_init(void); 8501da177e4SLinus Torvalds extern void xfrm6_state_init(void); 8511da177e4SLinus Torvalds extern void xfrm6_state_fini(void); 8521da177e4SLinus Torvalds 8531da177e4SLinus Torvalds extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *); 8541da177e4SLinus Torvalds extern struct xfrm_state *xfrm_state_alloc(void); 8551da177e4SLinus Torvalds extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, 8561da177e4SLinus Torvalds struct flowi *fl, struct xfrm_tmpl *tmpl, 8571da177e4SLinus Torvalds struct xfrm_policy *pol, int *err, 8581da177e4SLinus Torvalds unsigned short family); 8591da177e4SLinus Torvalds extern int xfrm_state_check_expire(struct xfrm_state *x); 8601da177e4SLinus Torvalds extern void xfrm_state_insert(struct xfrm_state *x); 8611da177e4SLinus Torvalds extern int xfrm_state_add(struct xfrm_state *x); 8621da177e4SLinus Torvalds extern int xfrm_state_update(struct xfrm_state *x); 8631da177e4SLinus Torvalds extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family); 8641da177e4SLinus Torvalds extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); 86526b15dadSJamal Hadi Salim extern int xfrm_state_delete(struct xfrm_state *x); 8661da177e4SLinus Torvalds extern void xfrm_state_flush(u8 proto); 8671da177e4SLinus Torvalds extern int xfrm_replay_check(struct xfrm_state *x, u32 seq); 8681da177e4SLinus Torvalds extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq); 8691da177e4SLinus Torvalds extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb); 8701da177e4SLinus Torvalds extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); 87172cb6962SHerbert Xu extern int xfrm_init_state(struct xfrm_state *x); 8721da177e4SLinus Torvalds extern int xfrm4_rcv(struct sk_buff *skb); 8731da177e4SLinus Torvalds extern int xfrm4_output(struct sk_buff *skb); 8741da177e4SLinus Torvalds extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler); 8751da177e4SLinus Torvalds extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler); 876951dbc8aSPatrick McHardy extern int xfrm6_rcv_spi(struct sk_buff **pskb, u32 spi); 877951dbc8aSPatrick McHardy extern int xfrm6_rcv(struct sk_buff **pskb); 8781da177e4SLinus Torvalds extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler); 8791da177e4SLinus Torvalds extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler); 8801da177e4SLinus Torvalds extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); 8811da177e4SLinus Torvalds extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); 8821da177e4SLinus Torvalds extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); 8831da177e4SLinus Torvalds extern int xfrm6_output(struct sk_buff *skb); 8841da177e4SLinus Torvalds 8851da177e4SLinus Torvalds #ifdef CONFIG_XFRM 8861da177e4SLinus Torvalds extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type); 8871da177e4SLinus Torvalds extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); 8881da177e4SLinus Torvalds extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family); 8891da177e4SLinus Torvalds #else 8901da177e4SLinus Torvalds static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 8911da177e4SLinus Torvalds { 8921da177e4SLinus Torvalds return -ENOPROTOOPT; 8931da177e4SLinus Torvalds } 8941da177e4SLinus Torvalds 8951da177e4SLinus Torvalds static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type) 8961da177e4SLinus Torvalds { 8971da177e4SLinus Torvalds /* should not happen */ 8981da177e4SLinus Torvalds kfree_skb(skb); 8991da177e4SLinus Torvalds return 0; 9001da177e4SLinus Torvalds } 9011da177e4SLinus Torvalds static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family) 9021da177e4SLinus Torvalds { 9031da177e4SLinus Torvalds return -EINVAL; 9041da177e4SLinus Torvalds } 9051da177e4SLinus Torvalds #endif 9061da177e4SLinus Torvalds 907dd0fc66fSAl Viro struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); 9081da177e4SLinus Torvalds extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *); 9091da177e4SLinus Torvalds int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 910df71837dSTrent Jaeger struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel, 911df71837dSTrent Jaeger struct xfrm_sec_ctx *ctx, int delete); 9121da177e4SLinus Torvalds struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete); 9131da177e4SLinus Torvalds void xfrm_policy_flush(void); 9141da177e4SLinus Torvalds u32 xfrm_get_acqseq(void); 9151da177e4SLinus Torvalds void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 9161da177e4SLinus Torvalds struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, 9171da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr, 9181da177e4SLinus Torvalds int create, unsigned short family); 9191da177e4SLinus Torvalds extern void xfrm_policy_flush(void); 9201da177e4SLinus Torvalds extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 9211da177e4SLinus Torvalds extern int xfrm_flush_bundles(void); 922399c180aSDavid S. Miller extern void xfrm_flush_all_bundles(void); 9231da177e4SLinus Torvalds extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family); 9241da177e4SLinus Torvalds extern void xfrm_init_pmtu(struct dst_entry *dst); 9251da177e4SLinus Torvalds 9261da177e4SLinus Torvalds extern wait_queue_head_t km_waitq; 9271da177e4SLinus Torvalds extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport); 9281da177e4SLinus Torvalds extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard); 9291da177e4SLinus Torvalds 9301da177e4SLinus Torvalds extern void xfrm_input_init(void); 9311da177e4SLinus Torvalds extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq); 9321da177e4SLinus Torvalds 9331da177e4SLinus Torvalds extern void xfrm_probe_algs(void); 9341da177e4SLinus Torvalds extern int xfrm_count_auth_supported(void); 9351da177e4SLinus Torvalds extern int xfrm_count_enc_supported(void); 9361da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 9371da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 9381da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 9391da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 9401da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 9411da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); 9421da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); 9431da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); 9441da177e4SLinus Torvalds 9451da177e4SLinus Torvalds struct crypto_tfm; 9461da177e4SLinus Torvalds typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int); 9471da177e4SLinus Torvalds 9481da177e4SLinus Torvalds extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm, 9491da177e4SLinus Torvalds int offset, int len, icv_update_fn_t icv_update); 9501da177e4SLinus Torvalds 9511da177e4SLinus Torvalds static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, 9521da177e4SLinus Torvalds int family) 9531da177e4SLinus Torvalds { 9541da177e4SLinus Torvalds switch (family) { 9551da177e4SLinus Torvalds default: 9561da177e4SLinus Torvalds case AF_INET: 9571da177e4SLinus Torvalds return a->a4 - b->a4; 9581da177e4SLinus Torvalds case AF_INET6: 9591da177e4SLinus Torvalds return ipv6_addr_cmp((struct in6_addr *)a, 9601da177e4SLinus Torvalds (struct in6_addr *)b); 9611da177e4SLinus Torvalds } 9621da177e4SLinus Torvalds } 9631da177e4SLinus Torvalds 96477d8d7a6SHerbert Xu static inline int xfrm_policy_id2dir(u32 index) 96577d8d7a6SHerbert Xu { 96677d8d7a6SHerbert Xu return index & 7; 96777d8d7a6SHerbert Xu } 96877d8d7a6SHerbert Xu 9691da177e4SLinus Torvalds #endif /* _NET_XFRM_H */ 970