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 23f8cd5488SJamal Hadi Salim extern struct sock *xfrm_nl; 24f8cd5488SJamal Hadi Salim extern u32 sysctl_xfrm_aevent_etime; 25f8cd5488SJamal Hadi Salim extern u32 sysctl_xfrm_aevent_rseqth; 26f8cd5488SJamal Hadi Salim 271da177e4SLinus Torvalds extern struct semaphore xfrm_cfg_sem; 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds /* Organization of SPD aka "XFRM rules" 301da177e4SLinus Torvalds ------------------------------------ 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds Basic objects: 331da177e4SLinus Torvalds - policy rule, struct xfrm_policy (=SPD entry) 341da177e4SLinus Torvalds - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 351da177e4SLinus Torvalds - instance of a transformer, struct xfrm_state (=SA) 361da177e4SLinus Torvalds - template to clone xfrm_state, struct xfrm_tmpl 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds SPD is plain linear list of xfrm_policy rules, ordered by priority. 391da177e4SLinus Torvalds (To be compatible with existing pfkeyv2 implementations, 401da177e4SLinus Torvalds many rules with priority of 0x7fffffff are allowed to exist and 411da177e4SLinus Torvalds such rules are ordered in an unpredictable way, thanks to bsd folks.) 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds Lookup is plain linear search until the first match with selector. 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds If "action" is "block", then we prohibit the flow, otherwise: 461da177e4SLinus Torvalds if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 471da177e4SLinus Torvalds policy entry has list of up to XFRM_MAX_DEPTH transformations, 481da177e4SLinus Torvalds described by templates xfrm_tmpl. Each template is resolved 491da177e4SLinus Torvalds to a complete xfrm_state (see below) and we pack bundle of transformations 501da177e4SLinus Torvalds to a dst_entry returned to requestor. 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds dst -. xfrm .-> xfrm_state #1 531da177e4SLinus Torvalds |---. child .-> dst -. xfrm .-> xfrm_state #2 541da177e4SLinus Torvalds |---. child .-> dst -. xfrm .-> xfrm_state #3 551da177e4SLinus Torvalds |---. child .-> NULL 561da177e4SLinus Torvalds 571da177e4SLinus Torvalds Bundles are cached at xrfm_policy struct (field ->bundles). 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds Resolution of xrfm_tmpl 611da177e4SLinus Torvalds ----------------------- 621da177e4SLinus Torvalds Template contains: 631da177e4SLinus Torvalds 1. ->mode Mode: transport or tunnel 641da177e4SLinus Torvalds 2. ->id.proto Protocol: AH/ESP/IPCOMP 651da177e4SLinus Torvalds 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 661da177e4SLinus Torvalds Q: allow to resolve security gateway? 671da177e4SLinus Torvalds 4. ->id.spi If not zero, static SPI. 681da177e4SLinus Torvalds 5. ->saddr Local tunnel endpoint, ignored for transport mode. 691da177e4SLinus Torvalds 6. ->algos List of allowed algos. Plain bitmask now. 701da177e4SLinus Torvalds Q: ealgos, aalgos, calgos. What a mess... 711da177e4SLinus Torvalds 7. ->share Sharing mode. 721da177e4SLinus Torvalds Q: how to implement private sharing mode? To add struct sock* to 731da177e4SLinus Torvalds flow id? 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds Having this template we search through SAD searching for entries 761da177e4SLinus Torvalds with appropriate mode/proto/algo, permitted by selector. 771da177e4SLinus Torvalds If no appropriate entry found, it is requested from key manager. 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds PROBLEMS: 801da177e4SLinus Torvalds Q: How to find all the bundles referring to a physical path for 811da177e4SLinus Torvalds PMTU discovery? Seems, dst should contain list of all parents... 821da177e4SLinus Torvalds and enter to infinite locking hierarchy disaster. 831da177e4SLinus Torvalds No! It is easier, we will not search for them, let them find us. 841da177e4SLinus Torvalds We add genid to each dst plus pointer to genid of raw IP route, 851da177e4SLinus Torvalds pmtu disc will update pmtu on raw IP route and increase its genid. 861da177e4SLinus Torvalds dst_check() will see this for top level and trigger resyncing 871da177e4SLinus Torvalds metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 881da177e4SLinus Torvalds */ 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds /* Full description of state of transformer. */ 911da177e4SLinus Torvalds struct xfrm_state 921da177e4SLinus Torvalds { 931da177e4SLinus Torvalds /* Note: bydst is re-used during gc */ 941da177e4SLinus Torvalds struct list_head bydst; 951da177e4SLinus Torvalds struct list_head byspi; 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds atomic_t refcnt; 981da177e4SLinus Torvalds spinlock_t lock; 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds struct xfrm_id id; 1011da177e4SLinus Torvalds struct xfrm_selector sel; 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds /* Key manger bits */ 1041da177e4SLinus Torvalds struct { 1051da177e4SLinus Torvalds u8 state; 1061da177e4SLinus Torvalds u8 dying; 1071da177e4SLinus Torvalds u32 seq; 1081da177e4SLinus Torvalds } km; 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds /* Parameters of this state. */ 1111da177e4SLinus Torvalds struct { 1121da177e4SLinus Torvalds u32 reqid; 1131da177e4SLinus Torvalds u8 mode; 1141da177e4SLinus Torvalds u8 replay_window; 1151da177e4SLinus Torvalds u8 aalgo, ealgo, calgo; 1161da177e4SLinus Torvalds u8 flags; 1171da177e4SLinus Torvalds u16 family; 1181da177e4SLinus Torvalds xfrm_address_t saddr; 1191da177e4SLinus Torvalds int header_len; 1201da177e4SLinus Torvalds int trailer_len; 1211da177e4SLinus Torvalds } props; 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds struct xfrm_lifetime_cfg lft; 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds /* Data for transformer */ 1261da177e4SLinus Torvalds struct xfrm_algo *aalg; 1271da177e4SLinus Torvalds struct xfrm_algo *ealg; 1281da177e4SLinus Torvalds struct xfrm_algo *calg; 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds /* Data for encapsulator */ 1311da177e4SLinus Torvalds struct xfrm_encap_tmpl *encap; 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 1341da177e4SLinus Torvalds struct xfrm_state *tunnel; 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvalds /* If a tunnel, number of users + 1 */ 1371da177e4SLinus Torvalds atomic_t tunnel_users; 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds /* State for replay detection */ 1401da177e4SLinus Torvalds struct xfrm_replay_state replay; 1411da177e4SLinus Torvalds 142f8cd5488SJamal Hadi Salim /* Replay detection state at the time we sent the last notification */ 143f8cd5488SJamal Hadi Salim struct xfrm_replay_state preplay; 144f8cd5488SJamal Hadi Salim 145f8cd5488SJamal Hadi Salim /* Replay detection notification settings */ 146f8cd5488SJamal Hadi Salim u32 replay_maxage; 147f8cd5488SJamal Hadi Salim u32 replay_maxdiff; 148f8cd5488SJamal Hadi Salim 149f8cd5488SJamal Hadi Salim /* Replay detection notification timer */ 150f8cd5488SJamal Hadi Salim struct timer_list rtimer; 151f8cd5488SJamal Hadi Salim 1521da177e4SLinus Torvalds /* Statistics */ 1531da177e4SLinus Torvalds struct xfrm_stats stats; 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds struct xfrm_lifetime_cur curlft; 1561da177e4SLinus Torvalds struct timer_list timer; 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds /* Reference to data common to all the instances of this 1591da177e4SLinus Torvalds * transformer. */ 1601da177e4SLinus Torvalds struct xfrm_type *type; 1611da177e4SLinus Torvalds 162df71837dSTrent Jaeger /* Security context */ 163df71837dSTrent Jaeger struct xfrm_sec_ctx *security; 164df71837dSTrent Jaeger 1651da177e4SLinus Torvalds /* Private data of this transformer, format is opaque, 1661da177e4SLinus Torvalds * interpreted by xfrm_type methods. */ 1671da177e4SLinus Torvalds void *data; 1681da177e4SLinus Torvalds }; 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds enum { 1711da177e4SLinus Torvalds XFRM_STATE_VOID, 1721da177e4SLinus Torvalds XFRM_STATE_ACQ, 1731da177e4SLinus Torvalds XFRM_STATE_VALID, 1741da177e4SLinus Torvalds XFRM_STATE_ERROR, 1751da177e4SLinus Torvalds XFRM_STATE_EXPIRED, 1761da177e4SLinus Torvalds XFRM_STATE_DEAD 1771da177e4SLinus Torvalds }; 1781da177e4SLinus Torvalds 17926b15dadSJamal Hadi Salim /* callback structure passed from either netlink or pfkey */ 18026b15dadSJamal Hadi Salim struct km_event 18126b15dadSJamal Hadi Salim { 182bf08867fSHerbert Xu union { 183bf08867fSHerbert Xu u32 hard; 184bf08867fSHerbert Xu u32 proto; 185bf08867fSHerbert Xu u32 byid; 186f8cd5488SJamal Hadi Salim u32 aevent; 187bf08867fSHerbert Xu } data; 188bf08867fSHerbert Xu 18926b15dadSJamal Hadi Salim u32 seq; 19026b15dadSJamal Hadi Salim u32 pid; 19126b15dadSJamal Hadi Salim u32 event; 19226b15dadSJamal Hadi Salim }; 19326b15dadSJamal Hadi Salim 1941da177e4SLinus Torvalds struct xfrm_type; 1951da177e4SLinus Torvalds struct xfrm_dst; 1961da177e4SLinus Torvalds struct xfrm_policy_afinfo { 1971da177e4SLinus Torvalds unsigned short family; 1981da177e4SLinus Torvalds rwlock_t lock; 1991da177e4SLinus Torvalds struct xfrm_type_map *type_map; 2001da177e4SLinus Torvalds struct dst_ops *dst_ops; 2011da177e4SLinus Torvalds void (*garbage_collect)(void); 2021da177e4SLinus Torvalds int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl); 2031da177e4SLinus Torvalds struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); 2041da177e4SLinus Torvalds int (*bundle_create)(struct xfrm_policy *policy, 2051da177e4SLinus Torvalds struct xfrm_state **xfrm, 2061da177e4SLinus Torvalds int nx, 2071da177e4SLinus Torvalds struct flowi *fl, 2081da177e4SLinus Torvalds struct dst_entry **dst_p); 2091da177e4SLinus Torvalds void (*decode_session)(struct sk_buff *skb, 2101da177e4SLinus Torvalds struct flowi *fl); 2111da177e4SLinus Torvalds }; 2121da177e4SLinus Torvalds 2131da177e4SLinus Torvalds extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); 2141da177e4SLinus Torvalds extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); 21526b15dadSJamal Hadi Salim extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c); 21626b15dadSJamal Hadi Salim extern void km_state_notify(struct xfrm_state *x, struct km_event *c); 2171da177e4SLinus Torvalds #define XFRM_ACQ_EXPIRES 30 2181da177e4SLinus Torvalds 2191da177e4SLinus Torvalds struct xfrm_tmpl; 220980ebd25SJamal Hadi Salim extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 22153bc6b4dSJamal Hadi Salim extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); 22253bc6b4dSJamal Hadi Salim extern int __xfrm_state_delete(struct xfrm_state *x); 22353bc6b4dSJamal Hadi Salim 2241da177e4SLinus Torvalds struct xfrm_state_afinfo { 2251da177e4SLinus Torvalds unsigned short family; 2261da177e4SLinus Torvalds rwlock_t lock; 2271da177e4SLinus Torvalds struct list_head *state_bydst; 2281da177e4SLinus Torvalds struct list_head *state_byspi; 229d094cd83SHerbert Xu int (*init_flags)(struct xfrm_state *x); 2301da177e4SLinus Torvalds void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, 2311da177e4SLinus Torvalds struct xfrm_tmpl *tmpl, 2321da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr); 2331da177e4SLinus Torvalds struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto); 2341da177e4SLinus Torvalds struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto, 2351da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr, 2361da177e4SLinus Torvalds int create); 2371da177e4SLinus Torvalds }; 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 2401da177e4SLinus Torvalds extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds extern void xfrm_state_delete_tunnel(struct xfrm_state *x); 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds struct xfrm_decap_state; 2451da177e4SLinus Torvalds struct xfrm_type 2461da177e4SLinus Torvalds { 2471da177e4SLinus Torvalds char *description; 2481da177e4SLinus Torvalds struct module *owner; 2491da177e4SLinus Torvalds __u8 proto; 2501da177e4SLinus Torvalds 25172cb6962SHerbert Xu int (*init_state)(struct xfrm_state *x); 2521da177e4SLinus Torvalds void (*destructor)(struct xfrm_state *); 2531da177e4SLinus Torvalds int (*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb); 2541da177e4SLinus Torvalds int (*output)(struct xfrm_state *, struct sk_buff *pskb); 2551da177e4SLinus Torvalds /* Estimate maximal size of result of transformation of a dgram */ 2561da177e4SLinus Torvalds u32 (*get_max_size)(struct xfrm_state *, int size); 2571da177e4SLinus Torvalds }; 2581da177e4SLinus Torvalds 2591da177e4SLinus Torvalds struct xfrm_type_map { 2601da177e4SLinus Torvalds rwlock_t lock; 2611da177e4SLinus Torvalds struct xfrm_type *map[256]; 2621da177e4SLinus Torvalds }; 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds extern int xfrm_register_type(struct xfrm_type *type, unsigned short family); 2651da177e4SLinus Torvalds extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family); 2661da177e4SLinus Torvalds extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family); 2671da177e4SLinus Torvalds extern void xfrm_put_type(struct xfrm_type *type); 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds struct xfrm_tmpl 2701da177e4SLinus Torvalds { 2711da177e4SLinus Torvalds /* id in template is interpreted as: 2721da177e4SLinus Torvalds * daddr - destination of tunnel, may be zero for transport mode. 2731da177e4SLinus Torvalds * spi - zero to acquire spi. Not zero if spi is static, then 2741da177e4SLinus Torvalds * daddr must be fixed too. 2751da177e4SLinus Torvalds * proto - AH/ESP/IPCOMP 2761da177e4SLinus Torvalds */ 2771da177e4SLinus Torvalds struct xfrm_id id; 2781da177e4SLinus Torvalds 2791da177e4SLinus Torvalds /* Source address of tunnel. Ignored, if it is not a tunnel. */ 2801da177e4SLinus Torvalds xfrm_address_t saddr; 2811da177e4SLinus Torvalds 2821da177e4SLinus Torvalds __u32 reqid; 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds /* Mode: transport/tunnel */ 2851da177e4SLinus Torvalds __u8 mode; 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds /* Sharing mode: unique, this session only, this user only etc. */ 2881da177e4SLinus Torvalds __u8 share; 2891da177e4SLinus Torvalds 2901da177e4SLinus Torvalds /* May skip this transfomration if no SA is found */ 2911da177e4SLinus Torvalds __u8 optional; 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds /* Bit mask of algos allowed for acquisition */ 2941da177e4SLinus Torvalds __u32 aalgos; 2951da177e4SLinus Torvalds __u32 ealgos; 2961da177e4SLinus Torvalds __u32 calgos; 2971da177e4SLinus Torvalds }; 2981da177e4SLinus Torvalds 2991da177e4SLinus Torvalds #define XFRM_MAX_DEPTH 4 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds struct xfrm_policy 3021da177e4SLinus Torvalds { 3031da177e4SLinus Torvalds struct xfrm_policy *next; 3041da177e4SLinus Torvalds struct list_head list; 3051da177e4SLinus Torvalds 3061da177e4SLinus Torvalds /* This lock only affects elements except for entry. */ 3071da177e4SLinus Torvalds rwlock_t lock; 3081da177e4SLinus Torvalds atomic_t refcnt; 3091da177e4SLinus Torvalds struct timer_list timer; 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds u32 priority; 3121da177e4SLinus Torvalds u32 index; 3131da177e4SLinus Torvalds struct xfrm_selector selector; 3141da177e4SLinus Torvalds struct xfrm_lifetime_cfg lft; 3151da177e4SLinus Torvalds struct xfrm_lifetime_cur curlft; 3161da177e4SLinus Torvalds struct dst_entry *bundles; 3171da177e4SLinus Torvalds __u16 family; 3181da177e4SLinus Torvalds __u8 action; 3191da177e4SLinus Torvalds __u8 flags; 3201da177e4SLinus Torvalds __u8 dead; 3211da177e4SLinus Torvalds __u8 xfrm_nr; 322df71837dSTrent Jaeger struct xfrm_sec_ctx *security; 3231da177e4SLinus Torvalds struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 3241da177e4SLinus Torvalds }; 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvalds #define XFRM_KM_TIMEOUT 30 327f8cd5488SJamal Hadi Salim /* which seqno */ 328f8cd5488SJamal Hadi Salim #define XFRM_REPLAY_SEQ 1 329f8cd5488SJamal Hadi Salim #define XFRM_REPLAY_OSEQ 2 330f8cd5488SJamal Hadi Salim #define XFRM_REPLAY_SEQ_MASK 3 331f8cd5488SJamal Hadi Salim /* what happened */ 332f8cd5488SJamal Hadi Salim #define XFRM_REPLAY_UPDATE XFRM_AE_CR 333f8cd5488SJamal Hadi Salim #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 334f8cd5488SJamal Hadi Salim 335f8cd5488SJamal Hadi Salim /* default aevent timeout in units of 100ms */ 336f8cd5488SJamal Hadi Salim #define XFRM_AE_ETIME 10 337f8cd5488SJamal Hadi Salim /* Async Event timer multiplier */ 338f8cd5488SJamal Hadi Salim #define XFRM_AE_ETH_M 10 339f8cd5488SJamal Hadi Salim /* default seq threshold size */ 340f8cd5488SJamal Hadi Salim #define XFRM_AE_SEQT_SIZE 2 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds struct xfrm_mgr 3431da177e4SLinus Torvalds { 3441da177e4SLinus Torvalds struct list_head list; 3451da177e4SLinus Torvalds char *id; 34626b15dadSJamal Hadi Salim int (*notify)(struct xfrm_state *x, struct km_event *c); 3471da177e4SLinus Torvalds int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); 3481da177e4SLinus Torvalds struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir); 3491da177e4SLinus Torvalds int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport); 35026b15dadSJamal Hadi Salim int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); 3511da177e4SLinus Torvalds }; 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds extern int xfrm_register_km(struct xfrm_mgr *km); 3541da177e4SLinus Torvalds extern int xfrm_unregister_km(struct xfrm_mgr *km); 3551da177e4SLinus Torvalds 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2]; 3581da177e4SLinus Torvalds 3591da177e4SLinus Torvalds static inline void xfrm_pol_hold(struct xfrm_policy *policy) 3601da177e4SLinus Torvalds { 3611da177e4SLinus Torvalds if (likely(policy != NULL)) 3621da177e4SLinus Torvalds atomic_inc(&policy->refcnt); 3631da177e4SLinus Torvalds } 3641da177e4SLinus Torvalds 3651da177e4SLinus Torvalds extern void __xfrm_policy_destroy(struct xfrm_policy *policy); 3661da177e4SLinus Torvalds 3671da177e4SLinus Torvalds static inline void xfrm_pol_put(struct xfrm_policy *policy) 3681da177e4SLinus Torvalds { 3691da177e4SLinus Torvalds if (atomic_dec_and_test(&policy->refcnt)) 3701da177e4SLinus Torvalds __xfrm_policy_destroy(policy); 3711da177e4SLinus Torvalds } 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds #define XFRM_DST_HSIZE 1024 3741da177e4SLinus Torvalds 3751da177e4SLinus Torvalds static __inline__ 3761da177e4SLinus Torvalds unsigned __xfrm4_dst_hash(xfrm_address_t *addr) 3771da177e4SLinus Torvalds { 3781da177e4SLinus Torvalds unsigned h; 3791da177e4SLinus Torvalds h = ntohl(addr->a4); 3801da177e4SLinus Torvalds h = (h ^ (h>>16)) % XFRM_DST_HSIZE; 3811da177e4SLinus Torvalds return h; 3821da177e4SLinus Torvalds } 3831da177e4SLinus Torvalds 3841da177e4SLinus Torvalds static __inline__ 3851da177e4SLinus Torvalds unsigned __xfrm6_dst_hash(xfrm_address_t *addr) 3861da177e4SLinus Torvalds { 3871da177e4SLinus Torvalds unsigned h; 3881da177e4SLinus Torvalds h = ntohl(addr->a6[2]^addr->a6[3]); 3891da177e4SLinus Torvalds h = (h ^ (h>>16)) % XFRM_DST_HSIZE; 3901da177e4SLinus Torvalds return h; 3911da177e4SLinus Torvalds } 3921da177e4SLinus Torvalds 3931da177e4SLinus Torvalds static __inline__ 3941da177e4SLinus Torvalds unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family) 3951da177e4SLinus Torvalds { 3961da177e4SLinus Torvalds switch (family) { 3971da177e4SLinus Torvalds case AF_INET: 3981da177e4SLinus Torvalds return __xfrm4_dst_hash(addr); 3991da177e4SLinus Torvalds case AF_INET6: 4001da177e4SLinus Torvalds return __xfrm6_dst_hash(addr); 4011da177e4SLinus Torvalds } 4021da177e4SLinus Torvalds return 0; 4031da177e4SLinus Torvalds } 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds static __inline__ 4061da177e4SLinus Torvalds unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto) 4071da177e4SLinus Torvalds { 4081da177e4SLinus Torvalds unsigned h; 4091da177e4SLinus Torvalds h = ntohl(addr->a4^spi^proto); 4101da177e4SLinus Torvalds h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE; 4111da177e4SLinus Torvalds return h; 4121da177e4SLinus Torvalds } 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds static __inline__ 4151da177e4SLinus Torvalds unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto) 4161da177e4SLinus Torvalds { 4171da177e4SLinus Torvalds unsigned h; 4181da177e4SLinus Torvalds h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto); 4191da177e4SLinus Torvalds h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE; 4201da177e4SLinus Torvalds return h; 4211da177e4SLinus Torvalds } 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds static __inline__ 4241da177e4SLinus Torvalds unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family) 4251da177e4SLinus Torvalds { 4261da177e4SLinus Torvalds switch (family) { 4271da177e4SLinus Torvalds case AF_INET: 4281da177e4SLinus Torvalds return __xfrm4_spi_hash(addr, spi, proto); 4291da177e4SLinus Torvalds case AF_INET6: 4301da177e4SLinus Torvalds return __xfrm6_spi_hash(addr, spi, proto); 4311da177e4SLinus Torvalds } 4321da177e4SLinus Torvalds return 0; /*XXX*/ 4331da177e4SLinus Torvalds } 4341da177e4SLinus Torvalds 4351da177e4SLinus Torvalds extern void __xfrm_state_destroy(struct xfrm_state *); 4361da177e4SLinus Torvalds 43721380b81SHerbert Xu static inline void __xfrm_state_put(struct xfrm_state *x) 43821380b81SHerbert Xu { 43921380b81SHerbert Xu atomic_dec(&x->refcnt); 44021380b81SHerbert Xu } 44121380b81SHerbert Xu 4421da177e4SLinus Torvalds static inline void xfrm_state_put(struct xfrm_state *x) 4431da177e4SLinus Torvalds { 4441da177e4SLinus Torvalds if (atomic_dec_and_test(&x->refcnt)) 4451da177e4SLinus Torvalds __xfrm_state_destroy(x); 4461da177e4SLinus Torvalds } 4471da177e4SLinus Torvalds 4481da177e4SLinus Torvalds static inline void xfrm_state_hold(struct xfrm_state *x) 4491da177e4SLinus Torvalds { 4501da177e4SLinus Torvalds atomic_inc(&x->refcnt); 4511da177e4SLinus Torvalds } 4521da177e4SLinus Torvalds 4531da177e4SLinus Torvalds static __inline__ int addr_match(void *token1, void *token2, int prefixlen) 4541da177e4SLinus Torvalds { 4551da177e4SLinus Torvalds __u32 *a1 = token1; 4561da177e4SLinus Torvalds __u32 *a2 = token2; 4571da177e4SLinus Torvalds int pdw; 4581da177e4SLinus Torvalds int pbi; 4591da177e4SLinus Torvalds 4601da177e4SLinus Torvalds pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ 4611da177e4SLinus Torvalds pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 4621da177e4SLinus Torvalds 4631da177e4SLinus Torvalds if (pdw) 4641da177e4SLinus Torvalds if (memcmp(a1, a2, pdw << 2)) 4651da177e4SLinus Torvalds return 0; 4661da177e4SLinus Torvalds 4671da177e4SLinus Torvalds if (pbi) { 4681da177e4SLinus Torvalds __u32 mask; 4691da177e4SLinus Torvalds 4701da177e4SLinus Torvalds mask = htonl((0xffffffff) << (32 - pbi)); 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds if ((a1[pdw] ^ a2[pdw]) & mask) 4731da177e4SLinus Torvalds return 0; 4741da177e4SLinus Torvalds } 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds return 1; 4771da177e4SLinus Torvalds } 4781da177e4SLinus Torvalds 4791da177e4SLinus Torvalds static __inline__ 4801da177e4SLinus Torvalds u16 xfrm_flowi_sport(struct flowi *fl) 4811da177e4SLinus Torvalds { 4821da177e4SLinus Torvalds u16 port; 4831da177e4SLinus Torvalds switch(fl->proto) { 4841da177e4SLinus Torvalds case IPPROTO_TCP: 4851da177e4SLinus Torvalds case IPPROTO_UDP: 4861da177e4SLinus Torvalds case IPPROTO_SCTP: 4871da177e4SLinus Torvalds port = fl->fl_ip_sport; 4881da177e4SLinus Torvalds break; 4891da177e4SLinus Torvalds case IPPROTO_ICMP: 4901da177e4SLinus Torvalds case IPPROTO_ICMPV6: 4911da177e4SLinus Torvalds port = htons(fl->fl_icmp_type); 4921da177e4SLinus Torvalds break; 4931da177e4SLinus Torvalds default: 4941da177e4SLinus Torvalds port = 0; /*XXX*/ 4951da177e4SLinus Torvalds } 4961da177e4SLinus Torvalds return port; 4971da177e4SLinus Torvalds } 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds static __inline__ 5001da177e4SLinus Torvalds u16 xfrm_flowi_dport(struct flowi *fl) 5011da177e4SLinus Torvalds { 5021da177e4SLinus Torvalds u16 port; 5031da177e4SLinus Torvalds switch(fl->proto) { 5041da177e4SLinus Torvalds case IPPROTO_TCP: 5051da177e4SLinus Torvalds case IPPROTO_UDP: 5061da177e4SLinus Torvalds case IPPROTO_SCTP: 5071da177e4SLinus Torvalds port = fl->fl_ip_dport; 5081da177e4SLinus Torvalds break; 5091da177e4SLinus Torvalds case IPPROTO_ICMP: 5101da177e4SLinus Torvalds case IPPROTO_ICMPV6: 5111da177e4SLinus Torvalds port = htons(fl->fl_icmp_code); 5121da177e4SLinus Torvalds break; 5131da177e4SLinus Torvalds default: 5141da177e4SLinus Torvalds port = 0; /*XXX*/ 5151da177e4SLinus Torvalds } 5161da177e4SLinus Torvalds return port; 5171da177e4SLinus Torvalds } 5181da177e4SLinus Torvalds 5191da177e4SLinus Torvalds static inline int 5201da177e4SLinus Torvalds __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) 5211da177e4SLinus Torvalds { 5221da177e4SLinus Torvalds return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && 5231da177e4SLinus Torvalds addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && 5241da177e4SLinus Torvalds !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && 5251da177e4SLinus Torvalds !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && 5261da177e4SLinus Torvalds (fl->proto == sel->proto || !sel->proto) && 5271da177e4SLinus Torvalds (fl->oif == sel->ifindex || !sel->ifindex); 5281da177e4SLinus Torvalds } 5291da177e4SLinus Torvalds 5301da177e4SLinus Torvalds static inline int 5311da177e4SLinus Torvalds __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) 5321da177e4SLinus Torvalds { 5331da177e4SLinus Torvalds return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && 5341da177e4SLinus Torvalds addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && 5351da177e4SLinus Torvalds !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && 5361da177e4SLinus Torvalds !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && 5371da177e4SLinus Torvalds (fl->proto == sel->proto || !sel->proto) && 5381da177e4SLinus Torvalds (fl->oif == sel->ifindex || !sel->ifindex); 5391da177e4SLinus Torvalds } 5401da177e4SLinus Torvalds 5411da177e4SLinus Torvalds static inline int 5421da177e4SLinus Torvalds xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, 5431da177e4SLinus Torvalds unsigned short family) 5441da177e4SLinus Torvalds { 5451da177e4SLinus Torvalds switch (family) { 5461da177e4SLinus Torvalds case AF_INET: 5471da177e4SLinus Torvalds return __xfrm4_selector_match(sel, fl); 5481da177e4SLinus Torvalds case AF_INET6: 5491da177e4SLinus Torvalds return __xfrm6_selector_match(sel, fl); 5501da177e4SLinus Torvalds } 5511da177e4SLinus Torvalds return 0; 5521da177e4SLinus Torvalds } 5531da177e4SLinus Torvalds 554df71837dSTrent Jaeger #ifdef CONFIG_SECURITY_NETWORK_XFRM 555df71837dSTrent Jaeger /* If neither has a context --> match 556df71837dSTrent Jaeger * Otherwise, both must have a context and the sids, doi, alg must match 557df71837dSTrent Jaeger */ 558df71837dSTrent Jaeger static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 559df71837dSTrent Jaeger { 560df71837dSTrent Jaeger return ((!s1 && !s2) || 561df71837dSTrent Jaeger (s1 && s2 && 562df71837dSTrent Jaeger (s1->ctx_sid == s2->ctx_sid) && 563df71837dSTrent Jaeger (s1->ctx_doi == s2->ctx_doi) && 564df71837dSTrent Jaeger (s1->ctx_alg == s2->ctx_alg))); 565df71837dSTrent Jaeger } 566df71837dSTrent Jaeger #else 567df71837dSTrent Jaeger static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 568df71837dSTrent Jaeger { 569df71837dSTrent Jaeger return 1; 570df71837dSTrent Jaeger } 571df71837dSTrent Jaeger #endif 572df71837dSTrent Jaeger 5731da177e4SLinus Torvalds /* A struct encoding bundle of transformations to apply to some set of flow. 5741da177e4SLinus Torvalds * 5751da177e4SLinus Torvalds * dst->child points to the next element of bundle. 5761da177e4SLinus Torvalds * dst->xfrm points to an instanse of transformer. 5771da177e4SLinus Torvalds * 5781da177e4SLinus Torvalds * Due to unfortunate limitations of current routing cache, which we 5791da177e4SLinus Torvalds * have no time to fix, it mirrors struct rtable and bound to the same 5801da177e4SLinus Torvalds * routing key, including saddr,daddr. However, we can have many of 5811da177e4SLinus Torvalds * bundles differing by session id. All the bundles grow from a parent 5821da177e4SLinus Torvalds * policy rule. 5831da177e4SLinus Torvalds */ 5841da177e4SLinus Torvalds struct xfrm_dst 5851da177e4SLinus Torvalds { 5861da177e4SLinus Torvalds union { 5871da177e4SLinus Torvalds struct xfrm_dst *next; 5881da177e4SLinus Torvalds struct dst_entry dst; 5891da177e4SLinus Torvalds struct rtable rt; 5901da177e4SLinus Torvalds struct rt6_info rt6; 5911da177e4SLinus Torvalds } u; 5921da177e4SLinus Torvalds struct dst_entry *route; 5931da177e4SLinus Torvalds u32 route_mtu_cached; 5941da177e4SLinus Torvalds u32 child_mtu_cached; 59592d63decSHideaki YOSHIFUJI u32 route_cookie; 59692d63decSHideaki YOSHIFUJI u32 path_cookie; 5971da177e4SLinus Torvalds }; 5981da177e4SLinus Torvalds 599aabc9761SHerbert Xu static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 600aabc9761SHerbert Xu { 601aabc9761SHerbert Xu dst_release(xdst->route); 602aabc9761SHerbert Xu if (likely(xdst->u.dst.xfrm)) 603aabc9761SHerbert Xu xfrm_state_put(xdst->u.dst.xfrm); 604aabc9761SHerbert Xu } 605aabc9761SHerbert Xu 606aabc9761SHerbert Xu extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 607aabc9761SHerbert Xu 6081da177e4SLinus Torvalds /* Decapsulation state, used by the input to store data during 6091da177e4SLinus Torvalds * decapsulation procedure, to be used later (during the policy 6101da177e4SLinus Torvalds * check 6111da177e4SLinus Torvalds */ 6121da177e4SLinus Torvalds struct xfrm_decap_state { 6131da177e4SLinus Torvalds char decap_data[20]; 6141da177e4SLinus Torvalds __u16 decap_type; 6151da177e4SLinus Torvalds }; 6161da177e4SLinus Torvalds 6171da177e4SLinus Torvalds struct sec_decap_state { 6181da177e4SLinus Torvalds struct xfrm_state *xvec; 6191da177e4SLinus Torvalds struct xfrm_decap_state decap; 6201da177e4SLinus Torvalds }; 6211da177e4SLinus Torvalds 6221da177e4SLinus Torvalds struct sec_path 6231da177e4SLinus Torvalds { 6241da177e4SLinus Torvalds atomic_t refcnt; 6251da177e4SLinus Torvalds int len; 6261da177e4SLinus Torvalds struct sec_decap_state x[XFRM_MAX_DEPTH]; 6271da177e4SLinus Torvalds }; 6281da177e4SLinus Torvalds 6291da177e4SLinus Torvalds static inline struct sec_path * 6301da177e4SLinus Torvalds secpath_get(struct sec_path *sp) 6311da177e4SLinus Torvalds { 6321da177e4SLinus Torvalds if (sp) 6331da177e4SLinus Torvalds atomic_inc(&sp->refcnt); 6341da177e4SLinus Torvalds return sp; 6351da177e4SLinus Torvalds } 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvalds extern void __secpath_destroy(struct sec_path *sp); 6381da177e4SLinus Torvalds 6391da177e4SLinus Torvalds static inline void 6401da177e4SLinus Torvalds secpath_put(struct sec_path *sp) 6411da177e4SLinus Torvalds { 6421da177e4SLinus Torvalds if (sp && atomic_dec_and_test(&sp->refcnt)) 6431da177e4SLinus Torvalds __secpath_destroy(sp); 6441da177e4SLinus Torvalds } 6451da177e4SLinus Torvalds 6461da177e4SLinus Torvalds extern struct sec_path *secpath_dup(struct sec_path *src); 6471da177e4SLinus Torvalds 6481da177e4SLinus Torvalds static inline void 6491da177e4SLinus Torvalds secpath_reset(struct sk_buff *skb) 6501da177e4SLinus Torvalds { 6511da177e4SLinus Torvalds #ifdef CONFIG_XFRM 6521da177e4SLinus Torvalds secpath_put(skb->sp); 6531da177e4SLinus Torvalds skb->sp = NULL; 6541da177e4SLinus Torvalds #endif 6551da177e4SLinus Torvalds } 6561da177e4SLinus Torvalds 6571da177e4SLinus Torvalds static inline int 6581da177e4SLinus Torvalds __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 6591da177e4SLinus Torvalds { 6601da177e4SLinus Torvalds return (tmpl->saddr.a4 && 6611da177e4SLinus Torvalds tmpl->saddr.a4 != x->props.saddr.a4); 6621da177e4SLinus Torvalds } 6631da177e4SLinus Torvalds 6641da177e4SLinus Torvalds static inline int 6651da177e4SLinus Torvalds __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 6661da177e4SLinus Torvalds { 6671da177e4SLinus Torvalds return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 6681da177e4SLinus Torvalds ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 6691da177e4SLinus Torvalds } 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds static inline int 6721da177e4SLinus Torvalds xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) 6731da177e4SLinus Torvalds { 6741da177e4SLinus Torvalds switch (family) { 6751da177e4SLinus Torvalds case AF_INET: 6761da177e4SLinus Torvalds return __xfrm4_state_addr_cmp(tmpl, x); 6771da177e4SLinus Torvalds case AF_INET6: 6781da177e4SLinus Torvalds return __xfrm6_state_addr_cmp(tmpl, x); 6791da177e4SLinus Torvalds } 6801da177e4SLinus Torvalds return !0; 6811da177e4SLinus Torvalds } 6821da177e4SLinus Torvalds 6831da177e4SLinus Torvalds #ifdef CONFIG_XFRM 6841da177e4SLinus Torvalds 6851da177e4SLinus Torvalds extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 6881da177e4SLinus Torvalds { 6891da177e4SLinus Torvalds if (sk && sk->sk_policy[XFRM_POLICY_IN]) 6901da177e4SLinus Torvalds return __xfrm_policy_check(sk, dir, skb, family); 6911da177e4SLinus Torvalds 6921da177e4SLinus Torvalds return (!xfrm_policy_list[dir] && !skb->sp) || 6931da177e4SLinus Torvalds (skb->dst->flags & DST_NOPOLICY) || 6941da177e4SLinus Torvalds __xfrm_policy_check(sk, dir, skb, family); 6951da177e4SLinus Torvalds } 6961da177e4SLinus Torvalds 6971da177e4SLinus Torvalds static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 6981da177e4SLinus Torvalds { 6991da177e4SLinus Torvalds return xfrm_policy_check(sk, dir, skb, AF_INET); 7001da177e4SLinus Torvalds } 7011da177e4SLinus Torvalds 7021da177e4SLinus Torvalds static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 7031da177e4SLinus Torvalds { 7041da177e4SLinus Torvalds return xfrm_policy_check(sk, dir, skb, AF_INET6); 7051da177e4SLinus Torvalds } 7061da177e4SLinus Torvalds 7073e3850e9SPatrick McHardy extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family); 7081da177e4SLinus Torvalds extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 7091da177e4SLinus Torvalds 7101da177e4SLinus Torvalds static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 7111da177e4SLinus Torvalds { 7121da177e4SLinus Torvalds return !xfrm_policy_list[XFRM_POLICY_OUT] || 7131da177e4SLinus Torvalds (skb->dst->flags & DST_NOXFRM) || 7141da177e4SLinus Torvalds __xfrm_route_forward(skb, family); 7151da177e4SLinus Torvalds } 7161da177e4SLinus Torvalds 7171da177e4SLinus Torvalds static inline int xfrm4_route_forward(struct sk_buff *skb) 7181da177e4SLinus Torvalds { 7191da177e4SLinus Torvalds return xfrm_route_forward(skb, AF_INET); 7201da177e4SLinus Torvalds } 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds static inline int xfrm6_route_forward(struct sk_buff *skb) 7231da177e4SLinus Torvalds { 7241da177e4SLinus Torvalds return xfrm_route_forward(skb, AF_INET6); 7251da177e4SLinus Torvalds } 7261da177e4SLinus Torvalds 7271da177e4SLinus Torvalds extern int __xfrm_sk_clone_policy(struct sock *sk); 7281da177e4SLinus Torvalds 7291da177e4SLinus Torvalds static inline int xfrm_sk_clone_policy(struct sock *sk) 7301da177e4SLinus Torvalds { 7311da177e4SLinus Torvalds if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) 7321da177e4SLinus Torvalds return __xfrm_sk_clone_policy(sk); 7331da177e4SLinus Torvalds return 0; 7341da177e4SLinus Torvalds } 7351da177e4SLinus Torvalds 7364666faabSHerbert Xu extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 7371da177e4SLinus Torvalds 7381da177e4SLinus Torvalds static inline void xfrm_sk_free_policy(struct sock *sk) 7391da177e4SLinus Torvalds { 7401da177e4SLinus Torvalds if (unlikely(sk->sk_policy[0] != NULL)) { 7411da177e4SLinus Torvalds xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); 7421da177e4SLinus Torvalds sk->sk_policy[0] = NULL; 7431da177e4SLinus Torvalds } 7441da177e4SLinus Torvalds if (unlikely(sk->sk_policy[1] != NULL)) { 7451da177e4SLinus Torvalds xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); 7461da177e4SLinus Torvalds sk->sk_policy[1] = NULL; 7471da177e4SLinus Torvalds } 7481da177e4SLinus Torvalds } 7491da177e4SLinus Torvalds 7501da177e4SLinus Torvalds #else 7511da177e4SLinus Torvalds 7521da177e4SLinus Torvalds static inline void xfrm_sk_free_policy(struct sock *sk) {} 7531da177e4SLinus Torvalds static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } 7541da177e4SLinus Torvalds static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 7551da177e4SLinus Torvalds static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 7561da177e4SLinus Torvalds static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 7571da177e4SLinus Torvalds { 7581da177e4SLinus Torvalds return 1; 7591da177e4SLinus Torvalds } 7601da177e4SLinus Torvalds static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 7611da177e4SLinus Torvalds { 7621da177e4SLinus Torvalds return 1; 7631da177e4SLinus Torvalds } 7641da177e4SLinus Torvalds static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 7651da177e4SLinus Torvalds { 7661da177e4SLinus Torvalds return 1; 7671da177e4SLinus Torvalds } 7681da177e4SLinus Torvalds #endif 7691da177e4SLinus Torvalds 7701da177e4SLinus Torvalds static __inline__ 7711da177e4SLinus Torvalds xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) 7721da177e4SLinus Torvalds { 7731da177e4SLinus Torvalds switch (family){ 7741da177e4SLinus Torvalds case AF_INET: 7751da177e4SLinus Torvalds return (xfrm_address_t *)&fl->fl4_dst; 7761da177e4SLinus Torvalds case AF_INET6: 7771da177e4SLinus Torvalds return (xfrm_address_t *)&fl->fl6_dst; 7781da177e4SLinus Torvalds } 7791da177e4SLinus Torvalds return NULL; 7801da177e4SLinus Torvalds } 7811da177e4SLinus Torvalds 7821da177e4SLinus Torvalds static __inline__ 7831da177e4SLinus Torvalds xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) 7841da177e4SLinus Torvalds { 7851da177e4SLinus Torvalds switch (family){ 7861da177e4SLinus Torvalds case AF_INET: 7871da177e4SLinus Torvalds return (xfrm_address_t *)&fl->fl4_src; 7881da177e4SLinus Torvalds case AF_INET6: 7891da177e4SLinus Torvalds return (xfrm_address_t *)&fl->fl6_src; 7901da177e4SLinus Torvalds } 7911da177e4SLinus Torvalds return NULL; 7921da177e4SLinus Torvalds } 7931da177e4SLinus Torvalds 7941da177e4SLinus Torvalds static __inline__ int 7951da177e4SLinus Torvalds __xfrm4_state_addr_check(struct xfrm_state *x, 7961da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr) 7971da177e4SLinus Torvalds { 7981da177e4SLinus Torvalds if (daddr->a4 == x->id.daddr.a4 && 7991da177e4SLinus Torvalds (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 8001da177e4SLinus Torvalds return 1; 8011da177e4SLinus Torvalds return 0; 8021da177e4SLinus Torvalds } 8031da177e4SLinus Torvalds 8041da177e4SLinus Torvalds static __inline__ int 8051da177e4SLinus Torvalds __xfrm6_state_addr_check(struct xfrm_state *x, 8061da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr) 8071da177e4SLinus Torvalds { 8081da177e4SLinus Torvalds if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 8091da177e4SLinus Torvalds (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| 8101da177e4SLinus Torvalds ipv6_addr_any((struct in6_addr *)saddr) || 8111da177e4SLinus Torvalds ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 8121da177e4SLinus Torvalds return 1; 8131da177e4SLinus Torvalds return 0; 8141da177e4SLinus Torvalds } 8151da177e4SLinus Torvalds 8161da177e4SLinus Torvalds static __inline__ int 8171da177e4SLinus Torvalds xfrm_state_addr_check(struct xfrm_state *x, 8181da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr, 8191da177e4SLinus Torvalds unsigned short family) 8201da177e4SLinus Torvalds { 8211da177e4SLinus Torvalds switch (family) { 8221da177e4SLinus Torvalds case AF_INET: 8231da177e4SLinus Torvalds return __xfrm4_state_addr_check(x, daddr, saddr); 8241da177e4SLinus Torvalds case AF_INET6: 8251da177e4SLinus Torvalds return __xfrm6_state_addr_check(x, daddr, saddr); 8261da177e4SLinus Torvalds } 8271da177e4SLinus Torvalds return 0; 8281da177e4SLinus Torvalds } 8291da177e4SLinus Torvalds 8301da177e4SLinus Torvalds static inline int xfrm_state_kern(struct xfrm_state *x) 8311da177e4SLinus Torvalds { 8321da177e4SLinus Torvalds return atomic_read(&x->tunnel_users); 8331da177e4SLinus Torvalds } 8341da177e4SLinus Torvalds 8351da177e4SLinus Torvalds /* 8361da177e4SLinus Torvalds * xfrm algorithm information 8371da177e4SLinus Torvalds */ 8381da177e4SLinus Torvalds struct xfrm_algo_auth_info { 8391da177e4SLinus Torvalds u16 icv_truncbits; 8401da177e4SLinus Torvalds u16 icv_fullbits; 8411da177e4SLinus Torvalds }; 8421da177e4SLinus Torvalds 8431da177e4SLinus Torvalds struct xfrm_algo_encr_info { 8441da177e4SLinus Torvalds u16 blockbits; 8451da177e4SLinus Torvalds u16 defkeybits; 8461da177e4SLinus Torvalds }; 8471da177e4SLinus Torvalds 8481da177e4SLinus Torvalds struct xfrm_algo_comp_info { 8491da177e4SLinus Torvalds u16 threshold; 8501da177e4SLinus Torvalds }; 8511da177e4SLinus Torvalds 8521da177e4SLinus Torvalds struct xfrm_algo_desc { 8531da177e4SLinus Torvalds char *name; 8541da177e4SLinus Torvalds u8 available:1; 8551da177e4SLinus Torvalds union { 8561da177e4SLinus Torvalds struct xfrm_algo_auth_info auth; 8571da177e4SLinus Torvalds struct xfrm_algo_encr_info encr; 8581da177e4SLinus Torvalds struct xfrm_algo_comp_info comp; 8591da177e4SLinus Torvalds } uinfo; 8601da177e4SLinus Torvalds struct sadb_alg desc; 8611da177e4SLinus Torvalds }; 8621da177e4SLinus Torvalds 8631da177e4SLinus Torvalds /* XFRM tunnel handlers. */ 8641da177e4SLinus Torvalds struct xfrm_tunnel { 8651da177e4SLinus Torvalds int (*handler)(struct sk_buff *skb); 8660303770dSPatrick McHardy void (*err_handler)(struct sk_buff *skb, __u32 info); 8671da177e4SLinus Torvalds }; 8681da177e4SLinus Torvalds 8691da177e4SLinus Torvalds struct xfrm6_tunnel { 870951dbc8aSPatrick McHardy int (*handler)(struct sk_buff **pskb); 8711da177e4SLinus Torvalds void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 8721da177e4SLinus Torvalds int type, int code, int offset, __u32 info); 8731da177e4SLinus Torvalds }; 8741da177e4SLinus Torvalds 8751da177e4SLinus Torvalds extern void xfrm_init(void); 8761da177e4SLinus Torvalds extern void xfrm4_init(void); 8771da177e4SLinus Torvalds extern void xfrm6_init(void); 8781da177e4SLinus Torvalds extern void xfrm6_fini(void); 8791da177e4SLinus Torvalds extern void xfrm_state_init(void); 8801da177e4SLinus Torvalds extern void xfrm4_state_init(void); 8811da177e4SLinus Torvalds extern void xfrm6_state_init(void); 8821da177e4SLinus Torvalds extern void xfrm6_state_fini(void); 8831da177e4SLinus Torvalds 8841da177e4SLinus Torvalds extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *); 8851da177e4SLinus Torvalds extern struct xfrm_state *xfrm_state_alloc(void); 8861da177e4SLinus Torvalds extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, 8871da177e4SLinus Torvalds struct flowi *fl, struct xfrm_tmpl *tmpl, 8881da177e4SLinus Torvalds struct xfrm_policy *pol, int *err, 8891da177e4SLinus Torvalds unsigned short family); 8901da177e4SLinus Torvalds extern int xfrm_state_check_expire(struct xfrm_state *x); 8911da177e4SLinus Torvalds extern void xfrm_state_insert(struct xfrm_state *x); 8921da177e4SLinus Torvalds extern int xfrm_state_add(struct xfrm_state *x); 8931da177e4SLinus Torvalds extern int xfrm_state_update(struct xfrm_state *x); 8941da177e4SLinus Torvalds extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family); 8951da177e4SLinus Torvalds extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); 89626b15dadSJamal Hadi Salim extern int xfrm_state_delete(struct xfrm_state *x); 8971da177e4SLinus Torvalds extern void xfrm_state_flush(u8 proto); 8981da177e4SLinus Torvalds extern int xfrm_replay_check(struct xfrm_state *x, u32 seq); 8991da177e4SLinus Torvalds extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq); 900f8cd5488SJamal Hadi Salim extern void xfrm_replay_notify(struct xfrm_state *x, int event); 9011da177e4SLinus Torvalds extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb); 9021da177e4SLinus Torvalds extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); 90372cb6962SHerbert Xu extern int xfrm_init_state(struct xfrm_state *x); 9041da177e4SLinus Torvalds extern int xfrm4_rcv(struct sk_buff *skb); 9051da177e4SLinus Torvalds extern int xfrm4_output(struct sk_buff *skb); 9061da177e4SLinus Torvalds extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler); 9071da177e4SLinus Torvalds extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler); 908951dbc8aSPatrick McHardy extern int xfrm6_rcv_spi(struct sk_buff **pskb, u32 spi); 909951dbc8aSPatrick McHardy extern int xfrm6_rcv(struct sk_buff **pskb); 9101da177e4SLinus Torvalds extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler); 9111da177e4SLinus Torvalds extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler); 9121da177e4SLinus Torvalds extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); 9131da177e4SLinus Torvalds extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); 9141da177e4SLinus Torvalds extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); 9151da177e4SLinus Torvalds extern int xfrm6_output(struct sk_buff *skb); 9161da177e4SLinus Torvalds 9171da177e4SLinus Torvalds #ifdef CONFIG_XFRM 9181da177e4SLinus Torvalds extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type); 9191da177e4SLinus Torvalds extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); 9201da177e4SLinus Torvalds extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family); 9211da177e4SLinus Torvalds #else 9221da177e4SLinus Torvalds static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 9231da177e4SLinus Torvalds { 9241da177e4SLinus Torvalds return -ENOPROTOOPT; 9251da177e4SLinus Torvalds } 9261da177e4SLinus Torvalds 9271da177e4SLinus Torvalds static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type) 9281da177e4SLinus Torvalds { 9291da177e4SLinus Torvalds /* should not happen */ 9301da177e4SLinus Torvalds kfree_skb(skb); 9311da177e4SLinus Torvalds return 0; 9321da177e4SLinus Torvalds } 9331da177e4SLinus Torvalds static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family) 9341da177e4SLinus Torvalds { 9351da177e4SLinus Torvalds return -EINVAL; 9361da177e4SLinus Torvalds } 9371da177e4SLinus Torvalds #endif 9381da177e4SLinus Torvalds 939dd0fc66fSAl Viro struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); 9401da177e4SLinus Torvalds extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *); 9411da177e4SLinus Torvalds int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 942df71837dSTrent Jaeger struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel, 943df71837dSTrent Jaeger struct xfrm_sec_ctx *ctx, int delete); 9441da177e4SLinus Torvalds struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete); 9451da177e4SLinus Torvalds void xfrm_policy_flush(void); 9461da177e4SLinus Torvalds u32 xfrm_get_acqseq(void); 9471da177e4SLinus Torvalds void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 9481da177e4SLinus Torvalds struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, 9491da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr, 9501da177e4SLinus Torvalds int create, unsigned short family); 9511da177e4SLinus Torvalds extern void xfrm_policy_flush(void); 9521da177e4SLinus Torvalds extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 9531da177e4SLinus Torvalds extern int xfrm_flush_bundles(void); 954399c180aSDavid S. Miller extern void xfrm_flush_all_bundles(void); 9551da177e4SLinus Torvalds extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family); 9561da177e4SLinus Torvalds extern void xfrm_init_pmtu(struct dst_entry *dst); 9571da177e4SLinus Torvalds 9581da177e4SLinus Torvalds extern wait_queue_head_t km_waitq; 9591da177e4SLinus Torvalds extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport); 9601da177e4SLinus Torvalds extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard); 9611da177e4SLinus Torvalds 9621da177e4SLinus Torvalds extern void xfrm_input_init(void); 9631da177e4SLinus Torvalds extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq); 9641da177e4SLinus Torvalds 9651da177e4SLinus Torvalds extern void xfrm_probe_algs(void); 9661da177e4SLinus Torvalds extern int xfrm_count_auth_supported(void); 9671da177e4SLinus Torvalds extern int xfrm_count_enc_supported(void); 9681da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 9691da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 9701da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 9711da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 9721da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 9731da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); 9741da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); 9751da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); 9761da177e4SLinus Torvalds 9771da177e4SLinus Torvalds struct crypto_tfm; 9781da177e4SLinus Torvalds typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int); 9791da177e4SLinus Torvalds 9801da177e4SLinus Torvalds extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm, 9811da177e4SLinus Torvalds int offset, int len, icv_update_fn_t icv_update); 9821da177e4SLinus Torvalds 9831da177e4SLinus Torvalds static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, 9841da177e4SLinus Torvalds int family) 9851da177e4SLinus Torvalds { 9861da177e4SLinus Torvalds switch (family) { 9871da177e4SLinus Torvalds default: 9881da177e4SLinus Torvalds case AF_INET: 9891da177e4SLinus Torvalds return a->a4 - b->a4; 9901da177e4SLinus Torvalds case AF_INET6: 9911da177e4SLinus Torvalds return ipv6_addr_cmp((struct in6_addr *)a, 9921da177e4SLinus Torvalds (struct in6_addr *)b); 9931da177e4SLinus Torvalds } 9941da177e4SLinus Torvalds } 9951da177e4SLinus Torvalds 99677d8d7a6SHerbert Xu static inline int xfrm_policy_id2dir(u32 index) 99777d8d7a6SHerbert Xu { 99877d8d7a6SHerbert Xu return index & 7; 99977d8d7a6SHerbert Xu } 100077d8d7a6SHerbert Xu 1001f8cd5488SJamal Hadi Salim static inline int xfrm_aevent_is_on(void) 1002f8cd5488SJamal Hadi Salim { 1003f8cd5488SJamal Hadi Salim return netlink_has_listeners(xfrm_nl,XFRMNLGRP_AEVENTS); 1004f8cd5488SJamal Hadi Salim } 1005f8cd5488SJamal Hadi Salim 1006f8cd5488SJamal Hadi Salim static inline void xfrm_aevent_doreplay(struct xfrm_state *x) 1007f8cd5488SJamal Hadi Salim { 1008f8cd5488SJamal Hadi Salim if (xfrm_aevent_is_on()) 1009f8cd5488SJamal Hadi Salim xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); 1010f8cd5488SJamal Hadi Salim } 1011f8cd5488SJamal Hadi Salim 1012f8cd5488SJamal Hadi Salim 10131da177e4SLinus Torvalds #endif /* _NET_XFRM_H */ 1014