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/pfkeyv2.h> 125794708fSMasahide NAKAMURA #include <linux/ipsec.h> 131da177e4SLinus Torvalds #include <linux/in6.h> 144a3e2f71SArjan van de Ven #include <linux/mutex.h> 151da177e4SLinus Torvalds 161da177e4SLinus Torvalds #include <net/sock.h> 171da177e4SLinus Torvalds #include <net/dst.h> 181da177e4SLinus Torvalds #include <net/route.h> 191da177e4SLinus Torvalds #include <net/ipv6.h> 201da177e4SLinus Torvalds #include <net/ip6_fib.h> 211da177e4SLinus Torvalds 221da177e4SLinus Torvalds #define XFRM_ALIGN8(len) (((len) + 7) & ~7) 23b59f45d0SHerbert Xu #define MODULE_ALIAS_XFRM_MODE(family, encap) \ 24b59f45d0SHerbert Xu MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap)) 251da177e4SLinus Torvalds 26f8cd5488SJamal Hadi Salim extern struct sock *xfrm_nl; 27f8cd5488SJamal Hadi Salim extern u32 sysctl_xfrm_aevent_etime; 28f8cd5488SJamal Hadi Salim extern u32 sysctl_xfrm_aevent_rseqth; 29f8cd5488SJamal Hadi Salim 304a3e2f71SArjan van de Ven extern struct mutex xfrm_cfg_mutex; 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds /* Organization of SPD aka "XFRM rules" 331da177e4SLinus Torvalds ------------------------------------ 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds Basic objects: 361da177e4SLinus Torvalds - policy rule, struct xfrm_policy (=SPD entry) 371da177e4SLinus Torvalds - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 381da177e4SLinus Torvalds - instance of a transformer, struct xfrm_state (=SA) 391da177e4SLinus Torvalds - template to clone xfrm_state, struct xfrm_tmpl 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds SPD is plain linear list of xfrm_policy rules, ordered by priority. 421da177e4SLinus Torvalds (To be compatible with existing pfkeyv2 implementations, 431da177e4SLinus Torvalds many rules with priority of 0x7fffffff are allowed to exist and 441da177e4SLinus Torvalds such rules are ordered in an unpredictable way, thanks to bsd folks.) 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds Lookup is plain linear search until the first match with selector. 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds If "action" is "block", then we prohibit the flow, otherwise: 491da177e4SLinus Torvalds if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 501da177e4SLinus Torvalds policy entry has list of up to XFRM_MAX_DEPTH transformations, 511da177e4SLinus Torvalds described by templates xfrm_tmpl. Each template is resolved 521da177e4SLinus Torvalds to a complete xfrm_state (see below) and we pack bundle of transformations 531da177e4SLinus Torvalds to a dst_entry returned to requestor. 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds dst -. xfrm .-> xfrm_state #1 561da177e4SLinus Torvalds |---. child .-> dst -. xfrm .-> xfrm_state #2 571da177e4SLinus Torvalds |---. child .-> dst -. xfrm .-> xfrm_state #3 581da177e4SLinus Torvalds |---. child .-> NULL 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds Bundles are cached at xrfm_policy struct (field ->bundles). 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds Resolution of xrfm_tmpl 641da177e4SLinus Torvalds ----------------------- 651da177e4SLinus Torvalds Template contains: 661da177e4SLinus Torvalds 1. ->mode Mode: transport or tunnel 671da177e4SLinus Torvalds 2. ->id.proto Protocol: AH/ESP/IPCOMP 681da177e4SLinus Torvalds 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 691da177e4SLinus Torvalds Q: allow to resolve security gateway? 701da177e4SLinus Torvalds 4. ->id.spi If not zero, static SPI. 711da177e4SLinus Torvalds 5. ->saddr Local tunnel endpoint, ignored for transport mode. 721da177e4SLinus Torvalds 6. ->algos List of allowed algos. Plain bitmask now. 731da177e4SLinus Torvalds Q: ealgos, aalgos, calgos. What a mess... 741da177e4SLinus Torvalds 7. ->share Sharing mode. 751da177e4SLinus Torvalds Q: how to implement private sharing mode? To add struct sock* to 761da177e4SLinus Torvalds flow id? 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds Having this template we search through SAD searching for entries 791da177e4SLinus Torvalds with appropriate mode/proto/algo, permitted by selector. 801da177e4SLinus Torvalds If no appropriate entry found, it is requested from key manager. 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds PROBLEMS: 831da177e4SLinus Torvalds Q: How to find all the bundles referring to a physical path for 841da177e4SLinus Torvalds PMTU discovery? Seems, dst should contain list of all parents... 851da177e4SLinus Torvalds and enter to infinite locking hierarchy disaster. 861da177e4SLinus Torvalds No! It is easier, we will not search for them, let them find us. 871da177e4SLinus Torvalds We add genid to each dst plus pointer to genid of raw IP route, 881da177e4SLinus Torvalds pmtu disc will update pmtu on raw IP route and increase its genid. 891da177e4SLinus Torvalds dst_check() will see this for top level and trigger resyncing 901da177e4SLinus Torvalds metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 911da177e4SLinus Torvalds */ 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds /* Full description of state of transformer. */ 941da177e4SLinus Torvalds struct xfrm_state 951da177e4SLinus Torvalds { 961da177e4SLinus Torvalds /* Note: bydst is re-used during gc */ 971da177e4SLinus Torvalds struct list_head bydst; 981da177e4SLinus Torvalds struct list_head byspi; 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds atomic_t refcnt; 1011da177e4SLinus Torvalds spinlock_t lock; 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds struct xfrm_id id; 1041da177e4SLinus Torvalds struct xfrm_selector sel; 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds /* Key manger bits */ 1071da177e4SLinus Torvalds struct { 1081da177e4SLinus Torvalds u8 state; 1091da177e4SLinus Torvalds u8 dying; 1101da177e4SLinus Torvalds u32 seq; 1111da177e4SLinus Torvalds } km; 1121da177e4SLinus Torvalds 1131da177e4SLinus Torvalds /* Parameters of this state. */ 1141da177e4SLinus Torvalds struct { 1151da177e4SLinus Torvalds u32 reqid; 1161da177e4SLinus Torvalds u8 mode; 1171da177e4SLinus Torvalds u8 replay_window; 1181da177e4SLinus Torvalds u8 aalgo, ealgo, calgo; 1191da177e4SLinus Torvalds u8 flags; 1201da177e4SLinus Torvalds u16 family; 1211da177e4SLinus Torvalds xfrm_address_t saddr; 1221da177e4SLinus Torvalds int header_len; 1231da177e4SLinus Torvalds int trailer_len; 1241da177e4SLinus Torvalds } props; 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds struct xfrm_lifetime_cfg lft; 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds /* Data for transformer */ 1291da177e4SLinus Torvalds struct xfrm_algo *aalg; 1301da177e4SLinus Torvalds struct xfrm_algo *ealg; 1311da177e4SLinus Torvalds struct xfrm_algo *calg; 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds /* Data for encapsulator */ 1341da177e4SLinus Torvalds struct xfrm_encap_tmpl *encap; 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvalds /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 1371da177e4SLinus Torvalds struct xfrm_state *tunnel; 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds /* If a tunnel, number of users + 1 */ 1401da177e4SLinus Torvalds atomic_t tunnel_users; 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds /* State for replay detection */ 1431da177e4SLinus Torvalds struct xfrm_replay_state replay; 1441da177e4SLinus Torvalds 145f8cd5488SJamal Hadi Salim /* Replay detection state at the time we sent the last notification */ 146f8cd5488SJamal Hadi Salim struct xfrm_replay_state preplay; 147f8cd5488SJamal Hadi Salim 1482717096aSJamal Hadi Salim /* internal flag that only holds state for delayed aevent at the 1492717096aSJamal Hadi Salim * moment 1502717096aSJamal Hadi Salim */ 1512717096aSJamal Hadi Salim u32 xflags; 1522717096aSJamal Hadi Salim 153f8cd5488SJamal Hadi Salim /* Replay detection notification settings */ 154f8cd5488SJamal Hadi Salim u32 replay_maxage; 155f8cd5488SJamal Hadi Salim u32 replay_maxdiff; 156f8cd5488SJamal Hadi Salim 157f8cd5488SJamal Hadi Salim /* Replay detection notification timer */ 158f8cd5488SJamal Hadi Salim struct timer_list rtimer; 159f8cd5488SJamal Hadi Salim 1601da177e4SLinus Torvalds /* Statistics */ 1611da177e4SLinus Torvalds struct xfrm_stats stats; 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds struct xfrm_lifetime_cur curlft; 1641da177e4SLinus Torvalds struct timer_list timer; 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds /* Reference to data common to all the instances of this 1671da177e4SLinus Torvalds * transformer. */ 1681da177e4SLinus Torvalds struct xfrm_type *type; 169b59f45d0SHerbert Xu struct xfrm_mode *mode; 1701da177e4SLinus Torvalds 171df71837dSTrent Jaeger /* Security context */ 172df71837dSTrent Jaeger struct xfrm_sec_ctx *security; 173df71837dSTrent Jaeger 1741da177e4SLinus Torvalds /* Private data of this transformer, format is opaque, 1751da177e4SLinus Torvalds * interpreted by xfrm_type methods. */ 1761da177e4SLinus Torvalds void *data; 1771da177e4SLinus Torvalds }; 1781da177e4SLinus Torvalds 1792717096aSJamal Hadi Salim /* xflags - make enum if more show up */ 1802717096aSJamal Hadi Salim #define XFRM_TIME_DEFER 1 1812717096aSJamal Hadi Salim 1821da177e4SLinus Torvalds enum { 1831da177e4SLinus Torvalds XFRM_STATE_VOID, 1841da177e4SLinus Torvalds XFRM_STATE_ACQ, 1851da177e4SLinus Torvalds XFRM_STATE_VALID, 1861da177e4SLinus Torvalds XFRM_STATE_ERROR, 1871da177e4SLinus Torvalds XFRM_STATE_EXPIRED, 1881da177e4SLinus Torvalds XFRM_STATE_DEAD 1891da177e4SLinus Torvalds }; 1901da177e4SLinus Torvalds 19126b15dadSJamal Hadi Salim /* callback structure passed from either netlink or pfkey */ 19226b15dadSJamal Hadi Salim struct km_event 19326b15dadSJamal Hadi Salim { 194bf08867fSHerbert Xu union { 195bf08867fSHerbert Xu u32 hard; 196bf08867fSHerbert Xu u32 proto; 197bf08867fSHerbert Xu u32 byid; 198f8cd5488SJamal Hadi Salim u32 aevent; 199bf08867fSHerbert Xu } data; 200bf08867fSHerbert Xu 20126b15dadSJamal Hadi Salim u32 seq; 20226b15dadSJamal Hadi Salim u32 pid; 20326b15dadSJamal Hadi Salim u32 event; 20426b15dadSJamal Hadi Salim }; 20526b15dadSJamal Hadi Salim 2061da177e4SLinus Torvalds struct xfrm_type; 2071da177e4SLinus Torvalds struct xfrm_dst; 2081da177e4SLinus Torvalds struct xfrm_policy_afinfo { 2091da177e4SLinus Torvalds unsigned short family; 21073654d61SHerbert Xu struct xfrm_type *type_map[IPPROTO_MAX]; 211b59f45d0SHerbert Xu struct xfrm_mode *mode_map[XFRM_MODE_MAX]; 2121da177e4SLinus Torvalds struct dst_ops *dst_ops; 2131da177e4SLinus Torvalds void (*garbage_collect)(void); 2141da177e4SLinus Torvalds int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl); 2151da177e4SLinus Torvalds struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); 2161da177e4SLinus Torvalds int (*bundle_create)(struct xfrm_policy *policy, 2171da177e4SLinus Torvalds struct xfrm_state **xfrm, 2181da177e4SLinus Torvalds int nx, 2191da177e4SLinus Torvalds struct flowi *fl, 2201da177e4SLinus Torvalds struct dst_entry **dst_p); 2211da177e4SLinus Torvalds void (*decode_session)(struct sk_buff *skb, 2221da177e4SLinus Torvalds struct flowi *fl); 2231da177e4SLinus Torvalds }; 2241da177e4SLinus Torvalds 2251da177e4SLinus Torvalds extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); 2261da177e4SLinus Torvalds extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); 22726b15dadSJamal Hadi Salim extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c); 22826b15dadSJamal Hadi Salim extern void km_state_notify(struct xfrm_state *x, struct km_event *c); 2291da177e4SLinus Torvalds #define XFRM_ACQ_EXPIRES 30 2301da177e4SLinus Torvalds 2311da177e4SLinus Torvalds struct xfrm_tmpl; 232980ebd25SJamal Hadi Salim extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 23353bc6b4dSJamal Hadi Salim extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); 23453bc6b4dSJamal Hadi Salim extern int __xfrm_state_delete(struct xfrm_state *x); 23553bc6b4dSJamal Hadi Salim 2361da177e4SLinus Torvalds struct xfrm_state_afinfo { 2371da177e4SLinus Torvalds unsigned short family; 2381da177e4SLinus Torvalds struct list_head *state_bydst; 2391da177e4SLinus Torvalds struct list_head *state_byspi; 240d094cd83SHerbert Xu int (*init_flags)(struct xfrm_state *x); 2411da177e4SLinus Torvalds void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, 2421da177e4SLinus Torvalds struct xfrm_tmpl *tmpl, 2431da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr); 2441da177e4SLinus Torvalds struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto); 2451da177e4SLinus Torvalds struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto, 2461da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr, 2471da177e4SLinus Torvalds int create); 2481da177e4SLinus Torvalds }; 2491da177e4SLinus Torvalds 2501da177e4SLinus Torvalds extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 2511da177e4SLinus Torvalds extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 2521da177e4SLinus Torvalds 2531da177e4SLinus Torvalds extern void xfrm_state_delete_tunnel(struct xfrm_state *x); 2541da177e4SLinus Torvalds 2551da177e4SLinus Torvalds struct xfrm_type 2561da177e4SLinus Torvalds { 2571da177e4SLinus Torvalds char *description; 2581da177e4SLinus Torvalds struct module *owner; 2591da177e4SLinus Torvalds __u8 proto; 2601da177e4SLinus Torvalds 26172cb6962SHerbert Xu int (*init_state)(struct xfrm_state *x); 2621da177e4SLinus Torvalds void (*destructor)(struct xfrm_state *); 263e695633eSHerbert Xu int (*input)(struct xfrm_state *, struct sk_buff *skb); 2641da177e4SLinus Torvalds int (*output)(struct xfrm_state *, struct sk_buff *pskb); 2651da177e4SLinus Torvalds /* Estimate maximal size of result of transformation of a dgram */ 2661da177e4SLinus Torvalds u32 (*get_max_size)(struct xfrm_state *, int size); 2671da177e4SLinus Torvalds }; 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds extern int xfrm_register_type(struct xfrm_type *type, unsigned short family); 2701da177e4SLinus Torvalds extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family); 2711da177e4SLinus Torvalds extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family); 2721da177e4SLinus Torvalds extern void xfrm_put_type(struct xfrm_type *type); 2731da177e4SLinus Torvalds 274b59f45d0SHerbert Xu struct xfrm_mode { 275b59f45d0SHerbert Xu int (*input)(struct xfrm_state *x, struct sk_buff *skb); 276b59f45d0SHerbert Xu int (*output)(struct sk_buff *skb); 277b59f45d0SHerbert Xu 278b59f45d0SHerbert Xu struct module *owner; 279b59f45d0SHerbert Xu unsigned int encap; 280b59f45d0SHerbert Xu }; 281b59f45d0SHerbert Xu 282b59f45d0SHerbert Xu extern int xfrm_register_mode(struct xfrm_mode *mode, int family); 283b59f45d0SHerbert Xu extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family); 284b59f45d0SHerbert Xu extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family); 285b59f45d0SHerbert Xu extern void xfrm_put_mode(struct xfrm_mode *mode); 286b59f45d0SHerbert Xu 2871da177e4SLinus Torvalds struct xfrm_tmpl 2881da177e4SLinus Torvalds { 2891da177e4SLinus Torvalds /* id in template is interpreted as: 2901da177e4SLinus Torvalds * daddr - destination of tunnel, may be zero for transport mode. 2911da177e4SLinus Torvalds * spi - zero to acquire spi. Not zero if spi is static, then 2921da177e4SLinus Torvalds * daddr must be fixed too. 2931da177e4SLinus Torvalds * proto - AH/ESP/IPCOMP 2941da177e4SLinus Torvalds */ 2951da177e4SLinus Torvalds struct xfrm_id id; 2961da177e4SLinus Torvalds 2971da177e4SLinus Torvalds /* Source address of tunnel. Ignored, if it is not a tunnel. */ 2981da177e4SLinus Torvalds xfrm_address_t saddr; 2991da177e4SLinus Torvalds 3001da177e4SLinus Torvalds __u32 reqid; 3011da177e4SLinus Torvalds 3027e49e6deSMasahide NAKAMURA /* Mode: transport, tunnel etc. */ 3031da177e4SLinus Torvalds __u8 mode; 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvalds /* Sharing mode: unique, this session only, this user only etc. */ 3061da177e4SLinus Torvalds __u8 share; 3071da177e4SLinus Torvalds 3081da177e4SLinus Torvalds /* May skip this transfomration if no SA is found */ 3091da177e4SLinus Torvalds __u8 optional; 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds /* Bit mask of algos allowed for acquisition */ 3121da177e4SLinus Torvalds __u32 aalgos; 3131da177e4SLinus Torvalds __u32 ealgos; 3141da177e4SLinus Torvalds __u32 calgos; 3151da177e4SLinus Torvalds }; 3161da177e4SLinus Torvalds 317*622dc828SMasahide NAKAMURA #define XFRM_MAX_DEPTH 6 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds struct xfrm_policy 3201da177e4SLinus Torvalds { 3211da177e4SLinus Torvalds struct xfrm_policy *next; 3221da177e4SLinus Torvalds struct list_head list; 3231da177e4SLinus Torvalds 3241da177e4SLinus Torvalds /* This lock only affects elements except for entry. */ 3251da177e4SLinus Torvalds rwlock_t lock; 3261da177e4SLinus Torvalds atomic_t refcnt; 3271da177e4SLinus Torvalds struct timer_list timer; 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds u32 priority; 3301da177e4SLinus Torvalds u32 index; 3311da177e4SLinus Torvalds struct xfrm_selector selector; 3321da177e4SLinus Torvalds struct xfrm_lifetime_cfg lft; 3331da177e4SLinus Torvalds struct xfrm_lifetime_cur curlft; 3341da177e4SLinus Torvalds struct dst_entry *bundles; 3351da177e4SLinus Torvalds __u16 family; 3361da177e4SLinus Torvalds __u8 action; 3371da177e4SLinus Torvalds __u8 flags; 3381da177e4SLinus Torvalds __u8 dead; 3391da177e4SLinus Torvalds __u8 xfrm_nr; 340df71837dSTrent Jaeger struct xfrm_sec_ctx *security; 3411da177e4SLinus Torvalds struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 3421da177e4SLinus Torvalds }; 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds #define XFRM_KM_TIMEOUT 30 345f8cd5488SJamal Hadi Salim /* which seqno */ 346f8cd5488SJamal Hadi Salim #define XFRM_REPLAY_SEQ 1 347f8cd5488SJamal Hadi Salim #define XFRM_REPLAY_OSEQ 2 348f8cd5488SJamal Hadi Salim #define XFRM_REPLAY_SEQ_MASK 3 349f8cd5488SJamal Hadi Salim /* what happened */ 350f8cd5488SJamal Hadi Salim #define XFRM_REPLAY_UPDATE XFRM_AE_CR 351f8cd5488SJamal Hadi Salim #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 352f8cd5488SJamal Hadi Salim 353f8cd5488SJamal Hadi Salim /* default aevent timeout in units of 100ms */ 354f8cd5488SJamal Hadi Salim #define XFRM_AE_ETIME 10 355f8cd5488SJamal Hadi Salim /* Async Event timer multiplier */ 356f8cd5488SJamal Hadi Salim #define XFRM_AE_ETH_M 10 357f8cd5488SJamal Hadi Salim /* default seq threshold size */ 358f8cd5488SJamal Hadi Salim #define XFRM_AE_SEQT_SIZE 2 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds struct xfrm_mgr 3611da177e4SLinus Torvalds { 3621da177e4SLinus Torvalds struct list_head list; 3631da177e4SLinus Torvalds char *id; 36426b15dadSJamal Hadi Salim int (*notify)(struct xfrm_state *x, struct km_event *c); 3651da177e4SLinus Torvalds int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); 366cb969f07SVenkat Yekkirala struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); 3671da177e4SLinus Torvalds int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport); 36826b15dadSJamal Hadi Salim int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); 3691da177e4SLinus Torvalds }; 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds extern int xfrm_register_km(struct xfrm_mgr *km); 3721da177e4SLinus Torvalds extern int xfrm_unregister_km(struct xfrm_mgr *km); 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds 3751da177e4SLinus Torvalds extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2]; 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds static inline void xfrm_pol_hold(struct xfrm_policy *policy) 3781da177e4SLinus Torvalds { 3791da177e4SLinus Torvalds if (likely(policy != NULL)) 3801da177e4SLinus Torvalds atomic_inc(&policy->refcnt); 3811da177e4SLinus Torvalds } 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds extern void __xfrm_policy_destroy(struct xfrm_policy *policy); 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds static inline void xfrm_pol_put(struct xfrm_policy *policy) 3861da177e4SLinus Torvalds { 3871da177e4SLinus Torvalds if (atomic_dec_and_test(&policy->refcnt)) 3881da177e4SLinus Torvalds __xfrm_policy_destroy(policy); 3891da177e4SLinus Torvalds } 3901da177e4SLinus Torvalds 3911da177e4SLinus Torvalds #define XFRM_DST_HSIZE 1024 3921da177e4SLinus Torvalds 3931da177e4SLinus Torvalds static __inline__ 3941da177e4SLinus Torvalds unsigned __xfrm4_dst_hash(xfrm_address_t *addr) 3951da177e4SLinus Torvalds { 3961da177e4SLinus Torvalds unsigned h; 3971da177e4SLinus Torvalds h = ntohl(addr->a4); 3981da177e4SLinus Torvalds h = (h ^ (h>>16)) % XFRM_DST_HSIZE; 3991da177e4SLinus Torvalds return h; 4001da177e4SLinus Torvalds } 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds static __inline__ 4031da177e4SLinus Torvalds unsigned __xfrm6_dst_hash(xfrm_address_t *addr) 4041da177e4SLinus Torvalds { 4051da177e4SLinus Torvalds unsigned h; 4061da177e4SLinus Torvalds h = ntohl(addr->a6[2]^addr->a6[3]); 4071da177e4SLinus Torvalds h = (h ^ (h>>16)) % XFRM_DST_HSIZE; 4081da177e4SLinus Torvalds return h; 4091da177e4SLinus Torvalds } 4101da177e4SLinus Torvalds 4111da177e4SLinus Torvalds static __inline__ 4121da177e4SLinus Torvalds unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family) 4131da177e4SLinus Torvalds { 4141da177e4SLinus Torvalds switch (family) { 4151da177e4SLinus Torvalds case AF_INET: 4161da177e4SLinus Torvalds return __xfrm4_dst_hash(addr); 4171da177e4SLinus Torvalds case AF_INET6: 4181da177e4SLinus Torvalds return __xfrm6_dst_hash(addr); 4191da177e4SLinus Torvalds } 4201da177e4SLinus Torvalds return 0; 4211da177e4SLinus Torvalds } 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds static __inline__ 4241da177e4SLinus Torvalds unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto) 4251da177e4SLinus Torvalds { 4261da177e4SLinus Torvalds unsigned h; 4271da177e4SLinus Torvalds h = ntohl(addr->a4^spi^proto); 4281da177e4SLinus Torvalds h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE; 4291da177e4SLinus Torvalds return h; 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds static __inline__ 4331da177e4SLinus Torvalds unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto) 4341da177e4SLinus Torvalds { 4351da177e4SLinus Torvalds unsigned h; 4361da177e4SLinus Torvalds h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto); 4371da177e4SLinus Torvalds h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE; 4381da177e4SLinus Torvalds return h; 4391da177e4SLinus Torvalds } 4401da177e4SLinus Torvalds 4411da177e4SLinus Torvalds static __inline__ 4421da177e4SLinus Torvalds unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family) 4431da177e4SLinus Torvalds { 4441da177e4SLinus Torvalds switch (family) { 4451da177e4SLinus Torvalds case AF_INET: 4461da177e4SLinus Torvalds return __xfrm4_spi_hash(addr, spi, proto); 4471da177e4SLinus Torvalds case AF_INET6: 4481da177e4SLinus Torvalds return __xfrm6_spi_hash(addr, spi, proto); 4491da177e4SLinus Torvalds } 4501da177e4SLinus Torvalds return 0; /*XXX*/ 4511da177e4SLinus Torvalds } 4521da177e4SLinus Torvalds 4531da177e4SLinus Torvalds extern void __xfrm_state_destroy(struct xfrm_state *); 4541da177e4SLinus Torvalds 45521380b81SHerbert Xu static inline void __xfrm_state_put(struct xfrm_state *x) 45621380b81SHerbert Xu { 45721380b81SHerbert Xu atomic_dec(&x->refcnt); 45821380b81SHerbert Xu } 45921380b81SHerbert Xu 4601da177e4SLinus Torvalds static inline void xfrm_state_put(struct xfrm_state *x) 4611da177e4SLinus Torvalds { 4621da177e4SLinus Torvalds if (atomic_dec_and_test(&x->refcnt)) 4631da177e4SLinus Torvalds __xfrm_state_destroy(x); 4641da177e4SLinus Torvalds } 4651da177e4SLinus Torvalds 4661da177e4SLinus Torvalds static inline void xfrm_state_hold(struct xfrm_state *x) 4671da177e4SLinus Torvalds { 4681da177e4SLinus Torvalds atomic_inc(&x->refcnt); 4691da177e4SLinus Torvalds } 4701da177e4SLinus Torvalds 4711da177e4SLinus Torvalds static __inline__ int addr_match(void *token1, void *token2, int prefixlen) 4721da177e4SLinus Torvalds { 4731da177e4SLinus Torvalds __u32 *a1 = token1; 4741da177e4SLinus Torvalds __u32 *a2 = token2; 4751da177e4SLinus Torvalds int pdw; 4761da177e4SLinus Torvalds int pbi; 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ 4791da177e4SLinus Torvalds pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 4801da177e4SLinus Torvalds 4811da177e4SLinus Torvalds if (pdw) 4821da177e4SLinus Torvalds if (memcmp(a1, a2, pdw << 2)) 4831da177e4SLinus Torvalds return 0; 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds if (pbi) { 4861da177e4SLinus Torvalds __u32 mask; 4871da177e4SLinus Torvalds 4881da177e4SLinus Torvalds mask = htonl((0xffffffff) << (32 - pbi)); 4891da177e4SLinus Torvalds 4901da177e4SLinus Torvalds if ((a1[pdw] ^ a2[pdw]) & mask) 4911da177e4SLinus Torvalds return 0; 4921da177e4SLinus Torvalds } 4931da177e4SLinus Torvalds 4941da177e4SLinus Torvalds return 1; 4951da177e4SLinus Torvalds } 4961da177e4SLinus Torvalds 4971da177e4SLinus Torvalds static __inline__ 4981da177e4SLinus Torvalds u16 xfrm_flowi_sport(struct flowi *fl) 4991da177e4SLinus Torvalds { 5001da177e4SLinus Torvalds u16 port; 5011da177e4SLinus Torvalds switch(fl->proto) { 5021da177e4SLinus Torvalds case IPPROTO_TCP: 5031da177e4SLinus Torvalds case IPPROTO_UDP: 5041da177e4SLinus Torvalds case IPPROTO_SCTP: 5051da177e4SLinus Torvalds port = fl->fl_ip_sport; 5061da177e4SLinus Torvalds break; 5071da177e4SLinus Torvalds case IPPROTO_ICMP: 5081da177e4SLinus Torvalds case IPPROTO_ICMPV6: 5091da177e4SLinus Torvalds port = htons(fl->fl_icmp_type); 5101da177e4SLinus Torvalds break; 5111da177e4SLinus Torvalds default: 5121da177e4SLinus Torvalds port = 0; /*XXX*/ 5131da177e4SLinus Torvalds } 5141da177e4SLinus Torvalds return port; 5151da177e4SLinus Torvalds } 5161da177e4SLinus Torvalds 5171da177e4SLinus Torvalds static __inline__ 5181da177e4SLinus Torvalds u16 xfrm_flowi_dport(struct flowi *fl) 5191da177e4SLinus Torvalds { 5201da177e4SLinus Torvalds u16 port; 5211da177e4SLinus Torvalds switch(fl->proto) { 5221da177e4SLinus Torvalds case IPPROTO_TCP: 5231da177e4SLinus Torvalds case IPPROTO_UDP: 5241da177e4SLinus Torvalds case IPPROTO_SCTP: 5251da177e4SLinus Torvalds port = fl->fl_ip_dport; 5261da177e4SLinus Torvalds break; 5271da177e4SLinus Torvalds case IPPROTO_ICMP: 5281da177e4SLinus Torvalds case IPPROTO_ICMPV6: 5291da177e4SLinus Torvalds port = htons(fl->fl_icmp_code); 5301da177e4SLinus Torvalds break; 5311da177e4SLinus Torvalds default: 5321da177e4SLinus Torvalds port = 0; /*XXX*/ 5331da177e4SLinus Torvalds } 5341da177e4SLinus Torvalds return port; 5351da177e4SLinus Torvalds } 5361da177e4SLinus Torvalds 5371da177e4SLinus Torvalds static inline int 5381da177e4SLinus Torvalds __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) 5391da177e4SLinus Torvalds { 5401da177e4SLinus Torvalds return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && 5411da177e4SLinus Torvalds addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && 5421da177e4SLinus Torvalds !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && 5431da177e4SLinus Torvalds !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && 5441da177e4SLinus Torvalds (fl->proto == sel->proto || !sel->proto) && 5451da177e4SLinus Torvalds (fl->oif == sel->ifindex || !sel->ifindex); 5461da177e4SLinus Torvalds } 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds static inline int 5491da177e4SLinus Torvalds __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) 5501da177e4SLinus Torvalds { 5511da177e4SLinus Torvalds return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && 5521da177e4SLinus Torvalds addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && 5531da177e4SLinus Torvalds !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && 5541da177e4SLinus Torvalds !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && 5551da177e4SLinus Torvalds (fl->proto == sel->proto || !sel->proto) && 5561da177e4SLinus Torvalds (fl->oif == sel->ifindex || !sel->ifindex); 5571da177e4SLinus Torvalds } 5581da177e4SLinus Torvalds 5591da177e4SLinus Torvalds static inline int 5601da177e4SLinus Torvalds xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, 5611da177e4SLinus Torvalds unsigned short family) 5621da177e4SLinus Torvalds { 5631da177e4SLinus Torvalds switch (family) { 5641da177e4SLinus Torvalds case AF_INET: 5651da177e4SLinus Torvalds return __xfrm4_selector_match(sel, fl); 5661da177e4SLinus Torvalds case AF_INET6: 5671da177e4SLinus Torvalds return __xfrm6_selector_match(sel, fl); 5681da177e4SLinus Torvalds } 5691da177e4SLinus Torvalds return 0; 5701da177e4SLinus Torvalds } 5711da177e4SLinus Torvalds 572df71837dSTrent Jaeger #ifdef CONFIG_SECURITY_NETWORK_XFRM 573df71837dSTrent Jaeger /* If neither has a context --> match 574df71837dSTrent Jaeger * Otherwise, both must have a context and the sids, doi, alg must match 575df71837dSTrent Jaeger */ 576df71837dSTrent Jaeger static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 577df71837dSTrent Jaeger { 578df71837dSTrent Jaeger return ((!s1 && !s2) || 579df71837dSTrent Jaeger (s1 && s2 && 580df71837dSTrent Jaeger (s1->ctx_sid == s2->ctx_sid) && 581df71837dSTrent Jaeger (s1->ctx_doi == s2->ctx_doi) && 582df71837dSTrent Jaeger (s1->ctx_alg == s2->ctx_alg))); 583df71837dSTrent Jaeger } 584df71837dSTrent Jaeger #else 585df71837dSTrent Jaeger static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 586df71837dSTrent Jaeger { 587df71837dSTrent Jaeger return 1; 588df71837dSTrent Jaeger } 589df71837dSTrent Jaeger #endif 590df71837dSTrent Jaeger 5911da177e4SLinus Torvalds /* A struct encoding bundle of transformations to apply to some set of flow. 5921da177e4SLinus Torvalds * 5931da177e4SLinus Torvalds * dst->child points to the next element of bundle. 5941da177e4SLinus Torvalds * dst->xfrm points to an instanse of transformer. 5951da177e4SLinus Torvalds * 5961da177e4SLinus Torvalds * Due to unfortunate limitations of current routing cache, which we 5971da177e4SLinus Torvalds * have no time to fix, it mirrors struct rtable and bound to the same 5981da177e4SLinus Torvalds * routing key, including saddr,daddr. However, we can have many of 5991da177e4SLinus Torvalds * bundles differing by session id. All the bundles grow from a parent 6001da177e4SLinus Torvalds * policy rule. 6011da177e4SLinus Torvalds */ 6021da177e4SLinus Torvalds struct xfrm_dst 6031da177e4SLinus Torvalds { 6041da177e4SLinus Torvalds union { 6051da177e4SLinus Torvalds struct xfrm_dst *next; 6061da177e4SLinus Torvalds struct dst_entry dst; 6071da177e4SLinus Torvalds struct rtable rt; 6081da177e4SLinus Torvalds struct rt6_info rt6; 6091da177e4SLinus Torvalds } u; 6101da177e4SLinus Torvalds struct dst_entry *route; 6111da177e4SLinus Torvalds u32 route_mtu_cached; 6121da177e4SLinus Torvalds u32 child_mtu_cached; 61392d63decSHideaki YOSHIFUJI u32 route_cookie; 61492d63decSHideaki YOSHIFUJI u32 path_cookie; 6151da177e4SLinus Torvalds }; 6161da177e4SLinus Torvalds 617aabc9761SHerbert Xu static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 618aabc9761SHerbert Xu { 619aabc9761SHerbert Xu dst_release(xdst->route); 620aabc9761SHerbert Xu if (likely(xdst->u.dst.xfrm)) 621aabc9761SHerbert Xu xfrm_state_put(xdst->u.dst.xfrm); 622aabc9761SHerbert Xu } 623aabc9761SHerbert Xu 624aabc9761SHerbert Xu extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 625aabc9761SHerbert Xu 6261da177e4SLinus Torvalds struct sec_path 6271da177e4SLinus Torvalds { 6281da177e4SLinus Torvalds atomic_t refcnt; 6291da177e4SLinus Torvalds int len; 630dbe5b4aaSHerbert Xu struct xfrm_state *xvec[XFRM_MAX_DEPTH]; 6311da177e4SLinus Torvalds }; 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds static inline struct sec_path * 6341da177e4SLinus Torvalds secpath_get(struct sec_path *sp) 6351da177e4SLinus Torvalds { 6361da177e4SLinus Torvalds if (sp) 6371da177e4SLinus Torvalds atomic_inc(&sp->refcnt); 6381da177e4SLinus Torvalds return sp; 6391da177e4SLinus Torvalds } 6401da177e4SLinus Torvalds 6411da177e4SLinus Torvalds extern void __secpath_destroy(struct sec_path *sp); 6421da177e4SLinus Torvalds 6431da177e4SLinus Torvalds static inline void 6441da177e4SLinus Torvalds secpath_put(struct sec_path *sp) 6451da177e4SLinus Torvalds { 6461da177e4SLinus Torvalds if (sp && atomic_dec_and_test(&sp->refcnt)) 6471da177e4SLinus Torvalds __secpath_destroy(sp); 6481da177e4SLinus Torvalds } 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds extern struct sec_path *secpath_dup(struct sec_path *src); 6511da177e4SLinus Torvalds 6521da177e4SLinus Torvalds static inline void 6531da177e4SLinus Torvalds secpath_reset(struct sk_buff *skb) 6541da177e4SLinus Torvalds { 6551da177e4SLinus Torvalds #ifdef CONFIG_XFRM 6561da177e4SLinus Torvalds secpath_put(skb->sp); 6571da177e4SLinus Torvalds skb->sp = NULL; 6581da177e4SLinus Torvalds #endif 6591da177e4SLinus Torvalds } 6601da177e4SLinus Torvalds 6611da177e4SLinus Torvalds static inline int 6621da177e4SLinus Torvalds __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 6631da177e4SLinus Torvalds { 6641da177e4SLinus Torvalds return (tmpl->saddr.a4 && 6651da177e4SLinus Torvalds tmpl->saddr.a4 != x->props.saddr.a4); 6661da177e4SLinus Torvalds } 6671da177e4SLinus Torvalds 6681da177e4SLinus Torvalds static inline int 6691da177e4SLinus Torvalds __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 6701da177e4SLinus Torvalds { 6711da177e4SLinus Torvalds return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 6721da177e4SLinus Torvalds ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 6731da177e4SLinus Torvalds } 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds static inline int 6761da177e4SLinus Torvalds xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) 6771da177e4SLinus Torvalds { 6781da177e4SLinus Torvalds switch (family) { 6791da177e4SLinus Torvalds case AF_INET: 6801da177e4SLinus Torvalds return __xfrm4_state_addr_cmp(tmpl, x); 6811da177e4SLinus Torvalds case AF_INET6: 6821da177e4SLinus Torvalds return __xfrm6_state_addr_cmp(tmpl, x); 6831da177e4SLinus Torvalds } 6841da177e4SLinus Torvalds return !0; 6851da177e4SLinus Torvalds } 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds #ifdef CONFIG_XFRM 6881da177e4SLinus Torvalds 6891da177e4SLinus Torvalds extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); 6901da177e4SLinus Torvalds 6911da177e4SLinus Torvalds static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 6921da177e4SLinus Torvalds { 6931da177e4SLinus Torvalds if (sk && sk->sk_policy[XFRM_POLICY_IN]) 6941da177e4SLinus Torvalds return __xfrm_policy_check(sk, dir, skb, family); 6951da177e4SLinus Torvalds 6961da177e4SLinus Torvalds return (!xfrm_policy_list[dir] && !skb->sp) || 6971da177e4SLinus Torvalds (skb->dst->flags & DST_NOPOLICY) || 6981da177e4SLinus Torvalds __xfrm_policy_check(sk, dir, skb, family); 6991da177e4SLinus Torvalds } 7001da177e4SLinus Torvalds 7011da177e4SLinus Torvalds static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 7021da177e4SLinus Torvalds { 7031da177e4SLinus Torvalds return xfrm_policy_check(sk, dir, skb, AF_INET); 7041da177e4SLinus Torvalds } 7051da177e4SLinus Torvalds 7061da177e4SLinus Torvalds static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 7071da177e4SLinus Torvalds { 7081da177e4SLinus Torvalds return xfrm_policy_check(sk, dir, skb, AF_INET6); 7091da177e4SLinus Torvalds } 7101da177e4SLinus Torvalds 7113e3850e9SPatrick McHardy extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family); 7121da177e4SLinus Torvalds extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 7131da177e4SLinus Torvalds 7141da177e4SLinus Torvalds static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 7151da177e4SLinus Torvalds { 7161da177e4SLinus Torvalds return !xfrm_policy_list[XFRM_POLICY_OUT] || 7171da177e4SLinus Torvalds (skb->dst->flags & DST_NOXFRM) || 7181da177e4SLinus Torvalds __xfrm_route_forward(skb, family); 7191da177e4SLinus Torvalds } 7201da177e4SLinus Torvalds 7211da177e4SLinus Torvalds static inline int xfrm4_route_forward(struct sk_buff *skb) 7221da177e4SLinus Torvalds { 7231da177e4SLinus Torvalds return xfrm_route_forward(skb, AF_INET); 7241da177e4SLinus Torvalds } 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds static inline int xfrm6_route_forward(struct sk_buff *skb) 7271da177e4SLinus Torvalds { 7281da177e4SLinus Torvalds return xfrm_route_forward(skb, AF_INET6); 7291da177e4SLinus Torvalds } 7301da177e4SLinus Torvalds 7311da177e4SLinus Torvalds extern int __xfrm_sk_clone_policy(struct sock *sk); 7321da177e4SLinus Torvalds 7331da177e4SLinus Torvalds static inline int xfrm_sk_clone_policy(struct sock *sk) 7341da177e4SLinus Torvalds { 7351da177e4SLinus Torvalds if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) 7361da177e4SLinus Torvalds return __xfrm_sk_clone_policy(sk); 7371da177e4SLinus Torvalds return 0; 7381da177e4SLinus Torvalds } 7391da177e4SLinus Torvalds 7404666faabSHerbert Xu extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 7411da177e4SLinus Torvalds 7421da177e4SLinus Torvalds static inline void xfrm_sk_free_policy(struct sock *sk) 7431da177e4SLinus Torvalds { 7441da177e4SLinus Torvalds if (unlikely(sk->sk_policy[0] != NULL)) { 7451da177e4SLinus Torvalds xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); 7461da177e4SLinus Torvalds sk->sk_policy[0] = NULL; 7471da177e4SLinus Torvalds } 7481da177e4SLinus Torvalds if (unlikely(sk->sk_policy[1] != NULL)) { 7491da177e4SLinus Torvalds xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); 7501da177e4SLinus Torvalds sk->sk_policy[1] = NULL; 7511da177e4SLinus Torvalds } 7521da177e4SLinus Torvalds } 7531da177e4SLinus Torvalds 7541da177e4SLinus Torvalds #else 7551da177e4SLinus Torvalds 7561da177e4SLinus Torvalds static inline void xfrm_sk_free_policy(struct sock *sk) {} 7571da177e4SLinus Torvalds static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } 7581da177e4SLinus Torvalds static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 7591da177e4SLinus Torvalds static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 7601da177e4SLinus Torvalds static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 7611da177e4SLinus Torvalds { 7621da177e4SLinus Torvalds return 1; 7631da177e4SLinus Torvalds } 7641da177e4SLinus Torvalds static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 7651da177e4SLinus Torvalds { 7661da177e4SLinus Torvalds return 1; 7671da177e4SLinus Torvalds } 7681da177e4SLinus Torvalds static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 7691da177e4SLinus Torvalds { 7701da177e4SLinus Torvalds return 1; 7711da177e4SLinus Torvalds } 7721da177e4SLinus Torvalds #endif 7731da177e4SLinus Torvalds 7741da177e4SLinus Torvalds static __inline__ 7751da177e4SLinus Torvalds xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) 7761da177e4SLinus Torvalds { 7771da177e4SLinus Torvalds switch (family){ 7781da177e4SLinus Torvalds case AF_INET: 7791da177e4SLinus Torvalds return (xfrm_address_t *)&fl->fl4_dst; 7801da177e4SLinus Torvalds case AF_INET6: 7811da177e4SLinus Torvalds return (xfrm_address_t *)&fl->fl6_dst; 7821da177e4SLinus Torvalds } 7831da177e4SLinus Torvalds return NULL; 7841da177e4SLinus Torvalds } 7851da177e4SLinus Torvalds 7861da177e4SLinus Torvalds static __inline__ 7871da177e4SLinus Torvalds xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) 7881da177e4SLinus Torvalds { 7891da177e4SLinus Torvalds switch (family){ 7901da177e4SLinus Torvalds case AF_INET: 7911da177e4SLinus Torvalds return (xfrm_address_t *)&fl->fl4_src; 7921da177e4SLinus Torvalds case AF_INET6: 7931da177e4SLinus Torvalds return (xfrm_address_t *)&fl->fl6_src; 7941da177e4SLinus Torvalds } 7951da177e4SLinus Torvalds return NULL; 7961da177e4SLinus Torvalds } 7971da177e4SLinus Torvalds 7981da177e4SLinus Torvalds static __inline__ int 7991da177e4SLinus Torvalds __xfrm4_state_addr_check(struct xfrm_state *x, 8001da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr) 8011da177e4SLinus Torvalds { 8021da177e4SLinus Torvalds if (daddr->a4 == x->id.daddr.a4 && 8031da177e4SLinus Torvalds (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 8041da177e4SLinus Torvalds return 1; 8051da177e4SLinus Torvalds return 0; 8061da177e4SLinus Torvalds } 8071da177e4SLinus Torvalds 8081da177e4SLinus Torvalds static __inline__ int 8091da177e4SLinus Torvalds __xfrm6_state_addr_check(struct xfrm_state *x, 8101da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr) 8111da177e4SLinus Torvalds { 8121da177e4SLinus Torvalds if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 8131da177e4SLinus Torvalds (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| 8141da177e4SLinus Torvalds ipv6_addr_any((struct in6_addr *)saddr) || 8151da177e4SLinus Torvalds ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 8161da177e4SLinus Torvalds return 1; 8171da177e4SLinus Torvalds return 0; 8181da177e4SLinus Torvalds } 8191da177e4SLinus Torvalds 8201da177e4SLinus Torvalds static __inline__ int 8211da177e4SLinus Torvalds xfrm_state_addr_check(struct xfrm_state *x, 8221da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr, 8231da177e4SLinus Torvalds unsigned short family) 8241da177e4SLinus Torvalds { 8251da177e4SLinus Torvalds switch (family) { 8261da177e4SLinus Torvalds case AF_INET: 8271da177e4SLinus Torvalds return __xfrm4_state_addr_check(x, daddr, saddr); 8281da177e4SLinus Torvalds case AF_INET6: 8291da177e4SLinus Torvalds return __xfrm6_state_addr_check(x, daddr, saddr); 8301da177e4SLinus Torvalds } 8311da177e4SLinus Torvalds return 0; 8321da177e4SLinus Torvalds } 8331da177e4SLinus Torvalds 8341da177e4SLinus Torvalds static inline int xfrm_state_kern(struct xfrm_state *x) 8351da177e4SLinus Torvalds { 8361da177e4SLinus Torvalds return atomic_read(&x->tunnel_users); 8371da177e4SLinus Torvalds } 8381da177e4SLinus Torvalds 8395794708fSMasahide NAKAMURA static inline int xfrm_id_proto_match(u8 proto, u8 userproto) 8405794708fSMasahide NAKAMURA { 841dc00a525SMasahide NAKAMURA return (!userproto || proto == userproto || 842dc00a525SMasahide NAKAMURA (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || 843dc00a525SMasahide NAKAMURA proto == IPPROTO_ESP || 844dc00a525SMasahide NAKAMURA proto == IPPROTO_COMP))); 8455794708fSMasahide NAKAMURA } 8465794708fSMasahide NAKAMURA 8471da177e4SLinus Torvalds /* 8481da177e4SLinus Torvalds * xfrm algorithm information 8491da177e4SLinus Torvalds */ 8501da177e4SLinus Torvalds struct xfrm_algo_auth_info { 8511da177e4SLinus Torvalds u16 icv_truncbits; 8521da177e4SLinus Torvalds u16 icv_fullbits; 8531da177e4SLinus Torvalds }; 8541da177e4SLinus Torvalds 8551da177e4SLinus Torvalds struct xfrm_algo_encr_info { 8561da177e4SLinus Torvalds u16 blockbits; 8571da177e4SLinus Torvalds u16 defkeybits; 8581da177e4SLinus Torvalds }; 8591da177e4SLinus Torvalds 8601da177e4SLinus Torvalds struct xfrm_algo_comp_info { 8611da177e4SLinus Torvalds u16 threshold; 8621da177e4SLinus Torvalds }; 8631da177e4SLinus Torvalds 8641da177e4SLinus Torvalds struct xfrm_algo_desc { 8651da177e4SLinus Torvalds char *name; 86604ff1260SHerbert Xu char *compat; 8671da177e4SLinus Torvalds u8 available:1; 8681da177e4SLinus Torvalds union { 8691da177e4SLinus Torvalds struct xfrm_algo_auth_info auth; 8701da177e4SLinus Torvalds struct xfrm_algo_encr_info encr; 8711da177e4SLinus Torvalds struct xfrm_algo_comp_info comp; 8721da177e4SLinus Torvalds } uinfo; 8731da177e4SLinus Torvalds struct sadb_alg desc; 8741da177e4SLinus Torvalds }; 8751da177e4SLinus Torvalds 8761da177e4SLinus Torvalds /* XFRM tunnel handlers. */ 8771da177e4SLinus Torvalds struct xfrm_tunnel { 8781da177e4SLinus Torvalds int (*handler)(struct sk_buff *skb); 879d2acc347SHerbert Xu int (*err_handler)(struct sk_buff *skb, __u32 info); 880d2acc347SHerbert Xu 881d2acc347SHerbert Xu struct xfrm_tunnel *next; 882d2acc347SHerbert Xu int priority; 8831da177e4SLinus Torvalds }; 8841da177e4SLinus Torvalds 8851da177e4SLinus Torvalds struct xfrm6_tunnel { 886d2acc347SHerbert Xu int (*handler)(struct sk_buff *skb); 887d2acc347SHerbert Xu int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 8881da177e4SLinus Torvalds int type, int code, int offset, __u32 info); 889d2acc347SHerbert Xu 890d2acc347SHerbert Xu struct xfrm6_tunnel *next; 891d2acc347SHerbert Xu int priority; 8921da177e4SLinus Torvalds }; 8931da177e4SLinus Torvalds 8941da177e4SLinus Torvalds extern void xfrm_init(void); 8951da177e4SLinus Torvalds extern void xfrm4_init(void); 8961da177e4SLinus Torvalds extern void xfrm6_init(void); 8971da177e4SLinus Torvalds extern void xfrm6_fini(void); 8981da177e4SLinus Torvalds extern void xfrm_state_init(void); 8991da177e4SLinus Torvalds extern void xfrm4_state_init(void); 9001da177e4SLinus Torvalds extern void xfrm6_state_init(void); 9011da177e4SLinus Torvalds extern void xfrm6_state_fini(void); 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *); 9041da177e4SLinus Torvalds extern struct xfrm_state *xfrm_state_alloc(void); 9051da177e4SLinus Torvalds extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, 9061da177e4SLinus Torvalds struct flowi *fl, struct xfrm_tmpl *tmpl, 9071da177e4SLinus Torvalds struct xfrm_policy *pol, int *err, 9081da177e4SLinus Torvalds unsigned short family); 9091da177e4SLinus Torvalds extern int xfrm_state_check_expire(struct xfrm_state *x); 9101da177e4SLinus Torvalds extern void xfrm_state_insert(struct xfrm_state *x); 9111da177e4SLinus Torvalds extern int xfrm_state_add(struct xfrm_state *x); 9121da177e4SLinus Torvalds extern int xfrm_state_update(struct xfrm_state *x); 9131da177e4SLinus Torvalds extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family); 9141da177e4SLinus Torvalds extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); 91526b15dadSJamal Hadi Salim extern int xfrm_state_delete(struct xfrm_state *x); 9161da177e4SLinus Torvalds extern void xfrm_state_flush(u8 proto); 9171da177e4SLinus Torvalds extern int xfrm_replay_check(struct xfrm_state *x, u32 seq); 9181da177e4SLinus Torvalds extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq); 919f8cd5488SJamal Hadi Salim extern void xfrm_replay_notify(struct xfrm_state *x, int event); 9201da177e4SLinus Torvalds extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb); 9211da177e4SLinus Torvalds extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); 92272cb6962SHerbert Xu extern int xfrm_init_state(struct xfrm_state *x); 9231da177e4SLinus Torvalds extern int xfrm4_rcv(struct sk_buff *skb); 9241da177e4SLinus Torvalds extern int xfrm4_output(struct sk_buff *skb); 9251da177e4SLinus Torvalds extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler); 9261da177e4SLinus Torvalds extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler); 927d2acc347SHerbert Xu extern int xfrm6_rcv_spi(struct sk_buff *skb, u32 spi); 928951dbc8aSPatrick McHardy extern int xfrm6_rcv(struct sk_buff **pskb); 9291da177e4SLinus Torvalds extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler); 9301da177e4SLinus Torvalds extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler); 9311da177e4SLinus Torvalds extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); 9321da177e4SLinus Torvalds extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); 9331da177e4SLinus Torvalds extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); 9341da177e4SLinus Torvalds extern int xfrm6_output(struct sk_buff *skb); 9351da177e4SLinus Torvalds 9361da177e4SLinus Torvalds #ifdef CONFIG_XFRM 9371da177e4SLinus Torvalds extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type); 9381da177e4SLinus Torvalds extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); 9391da177e4SLinus Torvalds extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family); 9401da177e4SLinus Torvalds #else 9411da177e4SLinus Torvalds static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 9421da177e4SLinus Torvalds { 9431da177e4SLinus Torvalds return -ENOPROTOOPT; 9441da177e4SLinus Torvalds } 9451da177e4SLinus Torvalds 9461da177e4SLinus Torvalds static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type) 9471da177e4SLinus Torvalds { 9481da177e4SLinus Torvalds /* should not happen */ 9491da177e4SLinus Torvalds kfree_skb(skb); 9501da177e4SLinus Torvalds return 0; 9511da177e4SLinus Torvalds } 9521da177e4SLinus Torvalds static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family) 9531da177e4SLinus Torvalds { 9541da177e4SLinus Torvalds return -EINVAL; 9551da177e4SLinus Torvalds } 9561da177e4SLinus Torvalds #endif 9571da177e4SLinus Torvalds 958dd0fc66fSAl Viro struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); 9591da177e4SLinus Torvalds extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *); 9601da177e4SLinus Torvalds int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 961df71837dSTrent Jaeger struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel, 962df71837dSTrent Jaeger struct xfrm_sec_ctx *ctx, int delete); 9631da177e4SLinus Torvalds struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete); 9641da177e4SLinus Torvalds void xfrm_policy_flush(void); 9651da177e4SLinus Torvalds u32 xfrm_get_acqseq(void); 9661da177e4SLinus Torvalds void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 9671da177e4SLinus Torvalds struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, 9681da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr, 9691da177e4SLinus Torvalds int create, unsigned short family); 9701da177e4SLinus Torvalds extern void xfrm_policy_flush(void); 9711da177e4SLinus Torvalds extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 9721da177e4SLinus Torvalds extern int xfrm_flush_bundles(void); 973399c180aSDavid S. Miller extern void xfrm_flush_all_bundles(void); 9741da177e4SLinus Torvalds extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family); 9751da177e4SLinus Torvalds extern void xfrm_init_pmtu(struct dst_entry *dst); 9761da177e4SLinus Torvalds 9771da177e4SLinus Torvalds extern wait_queue_head_t km_waitq; 9781da177e4SLinus Torvalds extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport); 9796c5c8ca7SJamal Hadi Salim extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid); 9801da177e4SLinus Torvalds 9811da177e4SLinus Torvalds extern void xfrm_input_init(void); 9821da177e4SLinus Torvalds extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq); 9831da177e4SLinus Torvalds 9841da177e4SLinus Torvalds extern void xfrm_probe_algs(void); 9851da177e4SLinus Torvalds extern int xfrm_count_auth_supported(void); 9861da177e4SLinus Torvalds extern int xfrm_count_enc_supported(void); 9871da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 9881da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 9891da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 9901da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 9911da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 9921da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); 9931da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); 9941da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); 9951da177e4SLinus Torvalds 99607d4ee58SHerbert Xu struct hash_desc; 9979409f38aSHerbert Xu struct scatterlist; 99807d4ee58SHerbert Xu typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *, 99907d4ee58SHerbert Xu unsigned int); 10001da177e4SLinus Torvalds 100107d4ee58SHerbert Xu extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm, 10021da177e4SLinus Torvalds int offset, int len, icv_update_fn_t icv_update); 10031da177e4SLinus Torvalds 10041da177e4SLinus Torvalds static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, 10051da177e4SLinus Torvalds int family) 10061da177e4SLinus Torvalds { 10071da177e4SLinus Torvalds switch (family) { 10081da177e4SLinus Torvalds default: 10091da177e4SLinus Torvalds case AF_INET: 10101da177e4SLinus Torvalds return a->a4 - b->a4; 10111da177e4SLinus Torvalds case AF_INET6: 10121da177e4SLinus Torvalds return ipv6_addr_cmp((struct in6_addr *)a, 10131da177e4SLinus Torvalds (struct in6_addr *)b); 10141da177e4SLinus Torvalds } 10151da177e4SLinus Torvalds } 10161da177e4SLinus Torvalds 101777d8d7a6SHerbert Xu static inline int xfrm_policy_id2dir(u32 index) 101877d8d7a6SHerbert Xu { 101977d8d7a6SHerbert Xu return index & 7; 102077d8d7a6SHerbert Xu } 102177d8d7a6SHerbert Xu 1022f8cd5488SJamal Hadi Salim static inline int xfrm_aevent_is_on(void) 1023f8cd5488SJamal Hadi Salim { 1024be33690dSPatrick McHardy struct sock *nlsk; 1025be33690dSPatrick McHardy int ret = 0; 1026be33690dSPatrick McHardy 1027be33690dSPatrick McHardy rcu_read_lock(); 1028be33690dSPatrick McHardy nlsk = rcu_dereference(xfrm_nl); 1029be33690dSPatrick McHardy if (nlsk) 1030be33690dSPatrick McHardy ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1031be33690dSPatrick McHardy rcu_read_unlock(); 1032be33690dSPatrick McHardy return ret; 1033f8cd5488SJamal Hadi Salim } 1034f8cd5488SJamal Hadi Salim 1035f8cd5488SJamal Hadi Salim static inline void xfrm_aevent_doreplay(struct xfrm_state *x) 1036f8cd5488SJamal Hadi Salim { 1037f8cd5488SJamal Hadi Salim if (xfrm_aevent_is_on()) 1038f8cd5488SJamal Hadi Salim xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); 1039f8cd5488SJamal Hadi Salim } 1040f8cd5488SJamal Hadi Salim 1041f8cd5488SJamal Hadi Salim 10421da177e4SLinus Torvalds #endif /* _NET_XFRM_H */ 1043