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> 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) 231da177e4SLinus Torvalds 24f8cd5488SJamal Hadi Salim extern struct sock *xfrm_nl; 25f8cd5488SJamal Hadi Salim extern u32 sysctl_xfrm_aevent_etime; 26f8cd5488SJamal Hadi Salim extern u32 sysctl_xfrm_aevent_rseqth; 27f8cd5488SJamal Hadi Salim 284a3e2f71SArjan van de Ven extern struct mutex xfrm_cfg_mutex; 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds /* Organization of SPD aka "XFRM rules" 311da177e4SLinus Torvalds ------------------------------------ 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds Basic objects: 341da177e4SLinus Torvalds - policy rule, struct xfrm_policy (=SPD entry) 351da177e4SLinus Torvalds - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) 361da177e4SLinus Torvalds - instance of a transformer, struct xfrm_state (=SA) 371da177e4SLinus Torvalds - template to clone xfrm_state, struct xfrm_tmpl 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds SPD is plain linear list of xfrm_policy rules, ordered by priority. 401da177e4SLinus Torvalds (To be compatible with existing pfkeyv2 implementations, 411da177e4SLinus Torvalds many rules with priority of 0x7fffffff are allowed to exist and 421da177e4SLinus Torvalds such rules are ordered in an unpredictable way, thanks to bsd folks.) 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds Lookup is plain linear search until the first match with selector. 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds If "action" is "block", then we prohibit the flow, otherwise: 471da177e4SLinus Torvalds if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, 481da177e4SLinus Torvalds policy entry has list of up to XFRM_MAX_DEPTH transformations, 491da177e4SLinus Torvalds described by templates xfrm_tmpl. Each template is resolved 501da177e4SLinus Torvalds to a complete xfrm_state (see below) and we pack bundle of transformations 511da177e4SLinus Torvalds to a dst_entry returned to requestor. 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds dst -. xfrm .-> xfrm_state #1 541da177e4SLinus Torvalds |---. child .-> dst -. xfrm .-> xfrm_state #2 551da177e4SLinus Torvalds |---. child .-> dst -. xfrm .-> xfrm_state #3 561da177e4SLinus Torvalds |---. child .-> NULL 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds Bundles are cached at xrfm_policy struct (field ->bundles). 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds Resolution of xrfm_tmpl 621da177e4SLinus Torvalds ----------------------- 631da177e4SLinus Torvalds Template contains: 641da177e4SLinus Torvalds 1. ->mode Mode: transport or tunnel 651da177e4SLinus Torvalds 2. ->id.proto Protocol: AH/ESP/IPCOMP 661da177e4SLinus Torvalds 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. 671da177e4SLinus Torvalds Q: allow to resolve security gateway? 681da177e4SLinus Torvalds 4. ->id.spi If not zero, static SPI. 691da177e4SLinus Torvalds 5. ->saddr Local tunnel endpoint, ignored for transport mode. 701da177e4SLinus Torvalds 6. ->algos List of allowed algos. Plain bitmask now. 711da177e4SLinus Torvalds Q: ealgos, aalgos, calgos. What a mess... 721da177e4SLinus Torvalds 7. ->share Sharing mode. 731da177e4SLinus Torvalds Q: how to implement private sharing mode? To add struct sock* to 741da177e4SLinus Torvalds flow id? 751da177e4SLinus Torvalds 761da177e4SLinus Torvalds Having this template we search through SAD searching for entries 771da177e4SLinus Torvalds with appropriate mode/proto/algo, permitted by selector. 781da177e4SLinus Torvalds If no appropriate entry found, it is requested from key manager. 791da177e4SLinus Torvalds 801da177e4SLinus Torvalds PROBLEMS: 811da177e4SLinus Torvalds Q: How to find all the bundles referring to a physical path for 821da177e4SLinus Torvalds PMTU discovery? Seems, dst should contain list of all parents... 831da177e4SLinus Torvalds and enter to infinite locking hierarchy disaster. 841da177e4SLinus Torvalds No! It is easier, we will not search for them, let them find us. 851da177e4SLinus Torvalds We add genid to each dst plus pointer to genid of raw IP route, 861da177e4SLinus Torvalds pmtu disc will update pmtu on raw IP route and increase its genid. 871da177e4SLinus Torvalds dst_check() will see this for top level and trigger resyncing 881da177e4SLinus Torvalds metrics. Plus, it will be made via sk->sk_dst_cache. Solved. 891da177e4SLinus Torvalds */ 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds /* Full description of state of transformer. */ 921da177e4SLinus Torvalds struct xfrm_state 931da177e4SLinus Torvalds { 941da177e4SLinus Torvalds /* Note: bydst is re-used during gc */ 951da177e4SLinus Torvalds struct list_head bydst; 961da177e4SLinus Torvalds struct list_head byspi; 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds atomic_t refcnt; 991da177e4SLinus Torvalds spinlock_t lock; 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds struct xfrm_id id; 1021da177e4SLinus Torvalds struct xfrm_selector sel; 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds /* Key manger bits */ 1051da177e4SLinus Torvalds struct { 1061da177e4SLinus Torvalds u8 state; 1071da177e4SLinus Torvalds u8 dying; 1081da177e4SLinus Torvalds u32 seq; 1091da177e4SLinus Torvalds } km; 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds /* Parameters of this state. */ 1121da177e4SLinus Torvalds struct { 1131da177e4SLinus Torvalds u32 reqid; 1141da177e4SLinus Torvalds u8 mode; 1151da177e4SLinus Torvalds u8 replay_window; 1161da177e4SLinus Torvalds u8 aalgo, ealgo, calgo; 1171da177e4SLinus Torvalds u8 flags; 1181da177e4SLinus Torvalds u16 family; 1191da177e4SLinus Torvalds xfrm_address_t saddr; 1201da177e4SLinus Torvalds int header_len; 1211da177e4SLinus Torvalds int trailer_len; 1221da177e4SLinus Torvalds } props; 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds struct xfrm_lifetime_cfg lft; 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds /* Data for transformer */ 1271da177e4SLinus Torvalds struct xfrm_algo *aalg; 1281da177e4SLinus Torvalds struct xfrm_algo *ealg; 1291da177e4SLinus Torvalds struct xfrm_algo *calg; 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds /* Data for encapsulator */ 1321da177e4SLinus Torvalds struct xfrm_encap_tmpl *encap; 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds /* IPComp needs an IPIP tunnel for handling uncompressed packets */ 1351da177e4SLinus Torvalds struct xfrm_state *tunnel; 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds /* If a tunnel, number of users + 1 */ 1381da177e4SLinus Torvalds atomic_t tunnel_users; 1391da177e4SLinus Torvalds 1401da177e4SLinus Torvalds /* State for replay detection */ 1411da177e4SLinus Torvalds struct xfrm_replay_state replay; 1421da177e4SLinus Torvalds 143f8cd5488SJamal Hadi Salim /* Replay detection state at the time we sent the last notification */ 144f8cd5488SJamal Hadi Salim struct xfrm_replay_state preplay; 145f8cd5488SJamal Hadi Salim 146f8cd5488SJamal Hadi Salim /* Replay detection notification settings */ 147f8cd5488SJamal Hadi Salim u32 replay_maxage; 148f8cd5488SJamal Hadi Salim u32 replay_maxdiff; 149f8cd5488SJamal Hadi Salim 150f8cd5488SJamal Hadi Salim /* Replay detection notification timer */ 151f8cd5488SJamal Hadi Salim struct timer_list rtimer; 152f8cd5488SJamal Hadi Salim 1531da177e4SLinus Torvalds /* Statistics */ 1541da177e4SLinus Torvalds struct xfrm_stats stats; 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds struct xfrm_lifetime_cur curlft; 1571da177e4SLinus Torvalds struct timer_list timer; 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds /* Reference to data common to all the instances of this 1601da177e4SLinus Torvalds * transformer. */ 1611da177e4SLinus Torvalds struct xfrm_type *type; 1621da177e4SLinus Torvalds 163df71837dSTrent Jaeger /* Security context */ 164df71837dSTrent Jaeger struct xfrm_sec_ctx *security; 165df71837dSTrent Jaeger 1661da177e4SLinus Torvalds /* Private data of this transformer, format is opaque, 1671da177e4SLinus Torvalds * interpreted by xfrm_type methods. */ 1681da177e4SLinus Torvalds void *data; 1691da177e4SLinus Torvalds }; 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds enum { 1721da177e4SLinus Torvalds XFRM_STATE_VOID, 1731da177e4SLinus Torvalds XFRM_STATE_ACQ, 1741da177e4SLinus Torvalds XFRM_STATE_VALID, 1751da177e4SLinus Torvalds XFRM_STATE_ERROR, 1761da177e4SLinus Torvalds XFRM_STATE_EXPIRED, 1771da177e4SLinus Torvalds XFRM_STATE_DEAD 1781da177e4SLinus Torvalds }; 1791da177e4SLinus Torvalds 18026b15dadSJamal Hadi Salim /* callback structure passed from either netlink or pfkey */ 18126b15dadSJamal Hadi Salim struct km_event 18226b15dadSJamal Hadi Salim { 183bf08867fSHerbert Xu union { 184bf08867fSHerbert Xu u32 hard; 185bf08867fSHerbert Xu u32 proto; 186bf08867fSHerbert Xu u32 byid; 187f8cd5488SJamal Hadi Salim u32 aevent; 188bf08867fSHerbert Xu } data; 189bf08867fSHerbert Xu 19026b15dadSJamal Hadi Salim u32 seq; 19126b15dadSJamal Hadi Salim u32 pid; 19226b15dadSJamal Hadi Salim u32 event; 19326b15dadSJamal Hadi Salim }; 19426b15dadSJamal Hadi Salim 1951da177e4SLinus Torvalds struct xfrm_type; 1961da177e4SLinus Torvalds struct xfrm_dst; 1971da177e4SLinus Torvalds struct xfrm_policy_afinfo { 1981da177e4SLinus Torvalds unsigned short family; 1991da177e4SLinus Torvalds rwlock_t lock; 2001da177e4SLinus Torvalds struct xfrm_type_map *type_map; 2011da177e4SLinus Torvalds struct dst_ops *dst_ops; 2021da177e4SLinus Torvalds void (*garbage_collect)(void); 2031da177e4SLinus Torvalds int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl); 2041da177e4SLinus Torvalds struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); 2051da177e4SLinus Torvalds int (*bundle_create)(struct xfrm_policy *policy, 2061da177e4SLinus Torvalds struct xfrm_state **xfrm, 2071da177e4SLinus Torvalds int nx, 2081da177e4SLinus Torvalds struct flowi *fl, 2091da177e4SLinus Torvalds struct dst_entry **dst_p); 2101da177e4SLinus Torvalds void (*decode_session)(struct sk_buff *skb, 2111da177e4SLinus Torvalds struct flowi *fl); 2121da177e4SLinus Torvalds }; 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); 2151da177e4SLinus Torvalds extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); 21626b15dadSJamal Hadi Salim extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c); 21726b15dadSJamal Hadi Salim extern void km_state_notify(struct xfrm_state *x, struct km_event *c); 2181da177e4SLinus Torvalds #define XFRM_ACQ_EXPIRES 30 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds struct xfrm_tmpl; 221980ebd25SJamal Hadi Salim extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); 22253bc6b4dSJamal Hadi Salim extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); 22353bc6b4dSJamal Hadi Salim extern int __xfrm_state_delete(struct xfrm_state *x); 22453bc6b4dSJamal Hadi Salim 2251da177e4SLinus Torvalds struct xfrm_state_afinfo { 2261da177e4SLinus Torvalds unsigned short family; 2271da177e4SLinus Torvalds rwlock_t lock; 2281da177e4SLinus Torvalds struct list_head *state_bydst; 2291da177e4SLinus Torvalds struct list_head *state_byspi; 230d094cd83SHerbert Xu int (*init_flags)(struct xfrm_state *x); 2311da177e4SLinus Torvalds void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, 2321da177e4SLinus Torvalds struct xfrm_tmpl *tmpl, 2331da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr); 2341da177e4SLinus Torvalds struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto); 2351da177e4SLinus Torvalds struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto, 2361da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr, 2371da177e4SLinus Torvalds int create); 2381da177e4SLinus Torvalds }; 2391da177e4SLinus Torvalds 2401da177e4SLinus Torvalds extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); 2411da177e4SLinus Torvalds extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds extern void xfrm_state_delete_tunnel(struct xfrm_state *x); 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds struct xfrm_decap_state; 2461da177e4SLinus Torvalds struct xfrm_type 2471da177e4SLinus Torvalds { 2481da177e4SLinus Torvalds char *description; 2491da177e4SLinus Torvalds struct module *owner; 2501da177e4SLinus Torvalds __u8 proto; 2511da177e4SLinus Torvalds 25272cb6962SHerbert Xu int (*init_state)(struct xfrm_state *x); 2531da177e4SLinus Torvalds void (*destructor)(struct xfrm_state *); 254e695633eSHerbert Xu int (*input)(struct xfrm_state *, struct sk_buff *skb); 2551da177e4SLinus Torvalds int (*output)(struct xfrm_state *, struct sk_buff *pskb); 2561da177e4SLinus Torvalds /* Estimate maximal size of result of transformation of a dgram */ 2571da177e4SLinus Torvalds u32 (*get_max_size)(struct xfrm_state *, int size); 2581da177e4SLinus Torvalds }; 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvalds struct xfrm_type_map { 2611da177e4SLinus Torvalds rwlock_t lock; 2621da177e4SLinus Torvalds struct xfrm_type *map[256]; 2631da177e4SLinus Torvalds }; 2641da177e4SLinus Torvalds 2651da177e4SLinus Torvalds extern int xfrm_register_type(struct xfrm_type *type, unsigned short family); 2661da177e4SLinus Torvalds extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family); 2671da177e4SLinus Torvalds extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family); 2681da177e4SLinus Torvalds extern void xfrm_put_type(struct xfrm_type *type); 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvalds struct xfrm_tmpl 2711da177e4SLinus Torvalds { 2721da177e4SLinus Torvalds /* id in template is interpreted as: 2731da177e4SLinus Torvalds * daddr - destination of tunnel, may be zero for transport mode. 2741da177e4SLinus Torvalds * spi - zero to acquire spi. Not zero if spi is static, then 2751da177e4SLinus Torvalds * daddr must be fixed too. 2761da177e4SLinus Torvalds * proto - AH/ESP/IPCOMP 2771da177e4SLinus Torvalds */ 2781da177e4SLinus Torvalds struct xfrm_id id; 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds /* Source address of tunnel. Ignored, if it is not a tunnel. */ 2811da177e4SLinus Torvalds xfrm_address_t saddr; 2821da177e4SLinus Torvalds 2831da177e4SLinus Torvalds __u32 reqid; 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds /* Mode: transport/tunnel */ 2861da177e4SLinus Torvalds __u8 mode; 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvalds /* Sharing mode: unique, this session only, this user only etc. */ 2891da177e4SLinus Torvalds __u8 share; 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds /* May skip this transfomration if no SA is found */ 2921da177e4SLinus Torvalds __u8 optional; 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvalds /* Bit mask of algos allowed for acquisition */ 2951da177e4SLinus Torvalds __u32 aalgos; 2961da177e4SLinus Torvalds __u32 ealgos; 2971da177e4SLinus Torvalds __u32 calgos; 2981da177e4SLinus Torvalds }; 2991da177e4SLinus Torvalds 3001da177e4SLinus Torvalds #define XFRM_MAX_DEPTH 4 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds struct xfrm_policy 3031da177e4SLinus Torvalds { 3041da177e4SLinus Torvalds struct xfrm_policy *next; 3051da177e4SLinus Torvalds struct list_head list; 3061da177e4SLinus Torvalds 3071da177e4SLinus Torvalds /* This lock only affects elements except for entry. */ 3081da177e4SLinus Torvalds rwlock_t lock; 3091da177e4SLinus Torvalds atomic_t refcnt; 3101da177e4SLinus Torvalds struct timer_list timer; 3111da177e4SLinus Torvalds 3121da177e4SLinus Torvalds u32 priority; 3131da177e4SLinus Torvalds u32 index; 3141da177e4SLinus Torvalds struct xfrm_selector selector; 3151da177e4SLinus Torvalds struct xfrm_lifetime_cfg lft; 3161da177e4SLinus Torvalds struct xfrm_lifetime_cur curlft; 3171da177e4SLinus Torvalds struct dst_entry *bundles; 3181da177e4SLinus Torvalds __u16 family; 3191da177e4SLinus Torvalds __u8 action; 3201da177e4SLinus Torvalds __u8 flags; 3211da177e4SLinus Torvalds __u8 dead; 3221da177e4SLinus Torvalds __u8 xfrm_nr; 323df71837dSTrent Jaeger struct xfrm_sec_ctx *security; 3241da177e4SLinus Torvalds struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; 3251da177e4SLinus Torvalds }; 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds #define XFRM_KM_TIMEOUT 30 328f8cd5488SJamal Hadi Salim /* which seqno */ 329f8cd5488SJamal Hadi Salim #define XFRM_REPLAY_SEQ 1 330f8cd5488SJamal Hadi Salim #define XFRM_REPLAY_OSEQ 2 331f8cd5488SJamal Hadi Salim #define XFRM_REPLAY_SEQ_MASK 3 332f8cd5488SJamal Hadi Salim /* what happened */ 333f8cd5488SJamal Hadi Salim #define XFRM_REPLAY_UPDATE XFRM_AE_CR 334f8cd5488SJamal Hadi Salim #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE 335f8cd5488SJamal Hadi Salim 336f8cd5488SJamal Hadi Salim /* default aevent timeout in units of 100ms */ 337f8cd5488SJamal Hadi Salim #define XFRM_AE_ETIME 10 338f8cd5488SJamal Hadi Salim /* Async Event timer multiplier */ 339f8cd5488SJamal Hadi Salim #define XFRM_AE_ETH_M 10 340f8cd5488SJamal Hadi Salim /* default seq threshold size */ 341f8cd5488SJamal Hadi Salim #define XFRM_AE_SEQT_SIZE 2 3421da177e4SLinus Torvalds 3431da177e4SLinus Torvalds struct xfrm_mgr 3441da177e4SLinus Torvalds { 3451da177e4SLinus Torvalds struct list_head list; 3461da177e4SLinus Torvalds char *id; 34726b15dadSJamal Hadi Salim int (*notify)(struct xfrm_state *x, struct km_event *c); 3481da177e4SLinus Torvalds int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); 3491da177e4SLinus Torvalds struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir); 3501da177e4SLinus Torvalds int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport); 35126b15dadSJamal Hadi Salim int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); 3521da177e4SLinus Torvalds }; 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds extern int xfrm_register_km(struct xfrm_mgr *km); 3551da177e4SLinus Torvalds extern int xfrm_unregister_km(struct xfrm_mgr *km); 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2]; 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds static inline void xfrm_pol_hold(struct xfrm_policy *policy) 3611da177e4SLinus Torvalds { 3621da177e4SLinus Torvalds if (likely(policy != NULL)) 3631da177e4SLinus Torvalds atomic_inc(&policy->refcnt); 3641da177e4SLinus Torvalds } 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds extern void __xfrm_policy_destroy(struct xfrm_policy *policy); 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds static inline void xfrm_pol_put(struct xfrm_policy *policy) 3691da177e4SLinus Torvalds { 3701da177e4SLinus Torvalds if (atomic_dec_and_test(&policy->refcnt)) 3711da177e4SLinus Torvalds __xfrm_policy_destroy(policy); 3721da177e4SLinus Torvalds } 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds #define XFRM_DST_HSIZE 1024 3751da177e4SLinus Torvalds 3761da177e4SLinus Torvalds static __inline__ 3771da177e4SLinus Torvalds unsigned __xfrm4_dst_hash(xfrm_address_t *addr) 3781da177e4SLinus Torvalds { 3791da177e4SLinus Torvalds unsigned h; 3801da177e4SLinus Torvalds h = ntohl(addr->a4); 3811da177e4SLinus Torvalds h = (h ^ (h>>16)) % XFRM_DST_HSIZE; 3821da177e4SLinus Torvalds return h; 3831da177e4SLinus Torvalds } 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds static __inline__ 3861da177e4SLinus Torvalds unsigned __xfrm6_dst_hash(xfrm_address_t *addr) 3871da177e4SLinus Torvalds { 3881da177e4SLinus Torvalds unsigned h; 3891da177e4SLinus Torvalds h = ntohl(addr->a6[2]^addr->a6[3]); 3901da177e4SLinus Torvalds h = (h ^ (h>>16)) % XFRM_DST_HSIZE; 3911da177e4SLinus Torvalds return h; 3921da177e4SLinus Torvalds } 3931da177e4SLinus Torvalds 3941da177e4SLinus Torvalds static __inline__ 3951da177e4SLinus Torvalds unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family) 3961da177e4SLinus Torvalds { 3971da177e4SLinus Torvalds switch (family) { 3981da177e4SLinus Torvalds case AF_INET: 3991da177e4SLinus Torvalds return __xfrm4_dst_hash(addr); 4001da177e4SLinus Torvalds case AF_INET6: 4011da177e4SLinus Torvalds return __xfrm6_dst_hash(addr); 4021da177e4SLinus Torvalds } 4031da177e4SLinus Torvalds return 0; 4041da177e4SLinus Torvalds } 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds static __inline__ 4071da177e4SLinus Torvalds unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto) 4081da177e4SLinus Torvalds { 4091da177e4SLinus Torvalds unsigned h; 4101da177e4SLinus Torvalds h = ntohl(addr->a4^spi^proto); 4111da177e4SLinus Torvalds h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE; 4121da177e4SLinus Torvalds return h; 4131da177e4SLinus Torvalds } 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds static __inline__ 4161da177e4SLinus Torvalds unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto) 4171da177e4SLinus Torvalds { 4181da177e4SLinus Torvalds unsigned h; 4191da177e4SLinus Torvalds h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto); 4201da177e4SLinus Torvalds h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE; 4211da177e4SLinus Torvalds return h; 4221da177e4SLinus Torvalds } 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds static __inline__ 4251da177e4SLinus Torvalds unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family) 4261da177e4SLinus Torvalds { 4271da177e4SLinus Torvalds switch (family) { 4281da177e4SLinus Torvalds case AF_INET: 4291da177e4SLinus Torvalds return __xfrm4_spi_hash(addr, spi, proto); 4301da177e4SLinus Torvalds case AF_INET6: 4311da177e4SLinus Torvalds return __xfrm6_spi_hash(addr, spi, proto); 4321da177e4SLinus Torvalds } 4331da177e4SLinus Torvalds return 0; /*XXX*/ 4341da177e4SLinus Torvalds } 4351da177e4SLinus Torvalds 4361da177e4SLinus Torvalds extern void __xfrm_state_destroy(struct xfrm_state *); 4371da177e4SLinus Torvalds 43821380b81SHerbert Xu static inline void __xfrm_state_put(struct xfrm_state *x) 43921380b81SHerbert Xu { 44021380b81SHerbert Xu atomic_dec(&x->refcnt); 44121380b81SHerbert Xu } 44221380b81SHerbert Xu 4431da177e4SLinus Torvalds static inline void xfrm_state_put(struct xfrm_state *x) 4441da177e4SLinus Torvalds { 4451da177e4SLinus Torvalds if (atomic_dec_and_test(&x->refcnt)) 4461da177e4SLinus Torvalds __xfrm_state_destroy(x); 4471da177e4SLinus Torvalds } 4481da177e4SLinus Torvalds 4491da177e4SLinus Torvalds static inline void xfrm_state_hold(struct xfrm_state *x) 4501da177e4SLinus Torvalds { 4511da177e4SLinus Torvalds atomic_inc(&x->refcnt); 4521da177e4SLinus Torvalds } 4531da177e4SLinus Torvalds 4541da177e4SLinus Torvalds static __inline__ int addr_match(void *token1, void *token2, int prefixlen) 4551da177e4SLinus Torvalds { 4561da177e4SLinus Torvalds __u32 *a1 = token1; 4571da177e4SLinus Torvalds __u32 *a2 = token2; 4581da177e4SLinus Torvalds int pdw; 4591da177e4SLinus Torvalds int pbi; 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ 4621da177e4SLinus Torvalds pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ 4631da177e4SLinus Torvalds 4641da177e4SLinus Torvalds if (pdw) 4651da177e4SLinus Torvalds if (memcmp(a1, a2, pdw << 2)) 4661da177e4SLinus Torvalds return 0; 4671da177e4SLinus Torvalds 4681da177e4SLinus Torvalds if (pbi) { 4691da177e4SLinus Torvalds __u32 mask; 4701da177e4SLinus Torvalds 4711da177e4SLinus Torvalds mask = htonl((0xffffffff) << (32 - pbi)); 4721da177e4SLinus Torvalds 4731da177e4SLinus Torvalds if ((a1[pdw] ^ a2[pdw]) & mask) 4741da177e4SLinus Torvalds return 0; 4751da177e4SLinus Torvalds } 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds return 1; 4781da177e4SLinus Torvalds } 4791da177e4SLinus Torvalds 4801da177e4SLinus Torvalds static __inline__ 4811da177e4SLinus Torvalds u16 xfrm_flowi_sport(struct flowi *fl) 4821da177e4SLinus Torvalds { 4831da177e4SLinus Torvalds u16 port; 4841da177e4SLinus Torvalds switch(fl->proto) { 4851da177e4SLinus Torvalds case IPPROTO_TCP: 4861da177e4SLinus Torvalds case IPPROTO_UDP: 4871da177e4SLinus Torvalds case IPPROTO_SCTP: 4881da177e4SLinus Torvalds port = fl->fl_ip_sport; 4891da177e4SLinus Torvalds break; 4901da177e4SLinus Torvalds case IPPROTO_ICMP: 4911da177e4SLinus Torvalds case IPPROTO_ICMPV6: 4921da177e4SLinus Torvalds port = htons(fl->fl_icmp_type); 4931da177e4SLinus Torvalds break; 4941da177e4SLinus Torvalds default: 4951da177e4SLinus Torvalds port = 0; /*XXX*/ 4961da177e4SLinus Torvalds } 4971da177e4SLinus Torvalds return port; 4981da177e4SLinus Torvalds } 4991da177e4SLinus Torvalds 5001da177e4SLinus Torvalds static __inline__ 5011da177e4SLinus Torvalds u16 xfrm_flowi_dport(struct flowi *fl) 5021da177e4SLinus Torvalds { 5031da177e4SLinus Torvalds u16 port; 5041da177e4SLinus Torvalds switch(fl->proto) { 5051da177e4SLinus Torvalds case IPPROTO_TCP: 5061da177e4SLinus Torvalds case IPPROTO_UDP: 5071da177e4SLinus Torvalds case IPPROTO_SCTP: 5081da177e4SLinus Torvalds port = fl->fl_ip_dport; 5091da177e4SLinus Torvalds break; 5101da177e4SLinus Torvalds case IPPROTO_ICMP: 5111da177e4SLinus Torvalds case IPPROTO_ICMPV6: 5121da177e4SLinus Torvalds port = htons(fl->fl_icmp_code); 5131da177e4SLinus Torvalds break; 5141da177e4SLinus Torvalds default: 5151da177e4SLinus Torvalds port = 0; /*XXX*/ 5161da177e4SLinus Torvalds } 5171da177e4SLinus Torvalds return port; 5181da177e4SLinus Torvalds } 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds static inline int 5211da177e4SLinus Torvalds __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) 5221da177e4SLinus Torvalds { 5231da177e4SLinus Torvalds return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && 5241da177e4SLinus Torvalds addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && 5251da177e4SLinus Torvalds !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && 5261da177e4SLinus Torvalds !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && 5271da177e4SLinus Torvalds (fl->proto == sel->proto || !sel->proto) && 5281da177e4SLinus Torvalds (fl->oif == sel->ifindex || !sel->ifindex); 5291da177e4SLinus Torvalds } 5301da177e4SLinus Torvalds 5311da177e4SLinus Torvalds static inline int 5321da177e4SLinus Torvalds __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) 5331da177e4SLinus Torvalds { 5341da177e4SLinus Torvalds return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && 5351da177e4SLinus Torvalds addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && 5361da177e4SLinus Torvalds !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && 5371da177e4SLinus Torvalds !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && 5381da177e4SLinus Torvalds (fl->proto == sel->proto || !sel->proto) && 5391da177e4SLinus Torvalds (fl->oif == sel->ifindex || !sel->ifindex); 5401da177e4SLinus Torvalds } 5411da177e4SLinus Torvalds 5421da177e4SLinus Torvalds static inline int 5431da177e4SLinus Torvalds xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, 5441da177e4SLinus Torvalds unsigned short family) 5451da177e4SLinus Torvalds { 5461da177e4SLinus Torvalds switch (family) { 5471da177e4SLinus Torvalds case AF_INET: 5481da177e4SLinus Torvalds return __xfrm4_selector_match(sel, fl); 5491da177e4SLinus Torvalds case AF_INET6: 5501da177e4SLinus Torvalds return __xfrm6_selector_match(sel, fl); 5511da177e4SLinus Torvalds } 5521da177e4SLinus Torvalds return 0; 5531da177e4SLinus Torvalds } 5541da177e4SLinus Torvalds 555df71837dSTrent Jaeger #ifdef CONFIG_SECURITY_NETWORK_XFRM 556df71837dSTrent Jaeger /* If neither has a context --> match 557df71837dSTrent Jaeger * Otherwise, both must have a context and the sids, doi, alg must match 558df71837dSTrent Jaeger */ 559df71837dSTrent Jaeger static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 560df71837dSTrent Jaeger { 561df71837dSTrent Jaeger return ((!s1 && !s2) || 562df71837dSTrent Jaeger (s1 && s2 && 563df71837dSTrent Jaeger (s1->ctx_sid == s2->ctx_sid) && 564df71837dSTrent Jaeger (s1->ctx_doi == s2->ctx_doi) && 565df71837dSTrent Jaeger (s1->ctx_alg == s2->ctx_alg))); 566df71837dSTrent Jaeger } 567df71837dSTrent Jaeger #else 568df71837dSTrent Jaeger static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) 569df71837dSTrent Jaeger { 570df71837dSTrent Jaeger return 1; 571df71837dSTrent Jaeger } 572df71837dSTrent Jaeger #endif 573df71837dSTrent Jaeger 5741da177e4SLinus Torvalds /* A struct encoding bundle of transformations to apply to some set of flow. 5751da177e4SLinus Torvalds * 5761da177e4SLinus Torvalds * dst->child points to the next element of bundle. 5771da177e4SLinus Torvalds * dst->xfrm points to an instanse of transformer. 5781da177e4SLinus Torvalds * 5791da177e4SLinus Torvalds * Due to unfortunate limitations of current routing cache, which we 5801da177e4SLinus Torvalds * have no time to fix, it mirrors struct rtable and bound to the same 5811da177e4SLinus Torvalds * routing key, including saddr,daddr. However, we can have many of 5821da177e4SLinus Torvalds * bundles differing by session id. All the bundles grow from a parent 5831da177e4SLinus Torvalds * policy rule. 5841da177e4SLinus Torvalds */ 5851da177e4SLinus Torvalds struct xfrm_dst 5861da177e4SLinus Torvalds { 5871da177e4SLinus Torvalds union { 5881da177e4SLinus Torvalds struct xfrm_dst *next; 5891da177e4SLinus Torvalds struct dst_entry dst; 5901da177e4SLinus Torvalds struct rtable rt; 5911da177e4SLinus Torvalds struct rt6_info rt6; 5921da177e4SLinus Torvalds } u; 5931da177e4SLinus Torvalds struct dst_entry *route; 5941da177e4SLinus Torvalds u32 route_mtu_cached; 5951da177e4SLinus Torvalds u32 child_mtu_cached; 59692d63decSHideaki YOSHIFUJI u32 route_cookie; 59792d63decSHideaki YOSHIFUJI u32 path_cookie; 5981da177e4SLinus Torvalds }; 5991da177e4SLinus Torvalds 600aabc9761SHerbert Xu static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) 601aabc9761SHerbert Xu { 602aabc9761SHerbert Xu dst_release(xdst->route); 603aabc9761SHerbert Xu if (likely(xdst->u.dst.xfrm)) 604aabc9761SHerbert Xu xfrm_state_put(xdst->u.dst.xfrm); 605aabc9761SHerbert Xu } 606aabc9761SHerbert Xu 607aabc9761SHerbert Xu extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); 608aabc9761SHerbert Xu 6091da177e4SLinus Torvalds /* Decapsulation state, used by the input to store data during 6101da177e4SLinus Torvalds * decapsulation procedure, to be used later (during the policy 6111da177e4SLinus Torvalds * check 6121da177e4SLinus Torvalds */ 6131da177e4SLinus Torvalds struct xfrm_decap_state { 6141da177e4SLinus Torvalds char decap_data[20]; 6151da177e4SLinus Torvalds __u16 decap_type; 6161da177e4SLinus Torvalds }; 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds struct sec_decap_state { 6191da177e4SLinus Torvalds struct xfrm_state *xvec; 6201da177e4SLinus Torvalds struct xfrm_decap_state decap; 6211da177e4SLinus Torvalds }; 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds struct sec_path 6241da177e4SLinus Torvalds { 6251da177e4SLinus Torvalds atomic_t refcnt; 6261da177e4SLinus Torvalds int len; 6271da177e4SLinus Torvalds struct sec_decap_state x[XFRM_MAX_DEPTH]; 6281da177e4SLinus Torvalds }; 6291da177e4SLinus Torvalds 6301da177e4SLinus Torvalds static inline struct sec_path * 6311da177e4SLinus Torvalds secpath_get(struct sec_path *sp) 6321da177e4SLinus Torvalds { 6331da177e4SLinus Torvalds if (sp) 6341da177e4SLinus Torvalds atomic_inc(&sp->refcnt); 6351da177e4SLinus Torvalds return sp; 6361da177e4SLinus Torvalds } 6371da177e4SLinus Torvalds 6381da177e4SLinus Torvalds extern void __secpath_destroy(struct sec_path *sp); 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvalds static inline void 6411da177e4SLinus Torvalds secpath_put(struct sec_path *sp) 6421da177e4SLinus Torvalds { 6431da177e4SLinus Torvalds if (sp && atomic_dec_and_test(&sp->refcnt)) 6441da177e4SLinus Torvalds __secpath_destroy(sp); 6451da177e4SLinus Torvalds } 6461da177e4SLinus Torvalds 6471da177e4SLinus Torvalds extern struct sec_path *secpath_dup(struct sec_path *src); 6481da177e4SLinus Torvalds 6491da177e4SLinus Torvalds static inline void 6501da177e4SLinus Torvalds secpath_reset(struct sk_buff *skb) 6511da177e4SLinus Torvalds { 6521da177e4SLinus Torvalds #ifdef CONFIG_XFRM 6531da177e4SLinus Torvalds secpath_put(skb->sp); 6541da177e4SLinus Torvalds skb->sp = NULL; 6551da177e4SLinus Torvalds #endif 6561da177e4SLinus Torvalds } 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds static inline int 6591da177e4SLinus Torvalds __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 6601da177e4SLinus Torvalds { 6611da177e4SLinus Torvalds return (tmpl->saddr.a4 && 6621da177e4SLinus Torvalds tmpl->saddr.a4 != x->props.saddr.a4); 6631da177e4SLinus Torvalds } 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds static inline int 6661da177e4SLinus Torvalds __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) 6671da177e4SLinus Torvalds { 6681da177e4SLinus Torvalds return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && 6691da177e4SLinus Torvalds ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); 6701da177e4SLinus Torvalds } 6711da177e4SLinus Torvalds 6721da177e4SLinus Torvalds static inline int 6731da177e4SLinus Torvalds xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) 6741da177e4SLinus Torvalds { 6751da177e4SLinus Torvalds switch (family) { 6761da177e4SLinus Torvalds case AF_INET: 6771da177e4SLinus Torvalds return __xfrm4_state_addr_cmp(tmpl, x); 6781da177e4SLinus Torvalds case AF_INET6: 6791da177e4SLinus Torvalds return __xfrm6_state_addr_cmp(tmpl, x); 6801da177e4SLinus Torvalds } 6811da177e4SLinus Torvalds return !0; 6821da177e4SLinus Torvalds } 6831da177e4SLinus Torvalds 6841da177e4SLinus Torvalds #ifdef CONFIG_XFRM 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 6891da177e4SLinus Torvalds { 6901da177e4SLinus Torvalds if (sk && sk->sk_policy[XFRM_POLICY_IN]) 6911da177e4SLinus Torvalds return __xfrm_policy_check(sk, dir, skb, family); 6921da177e4SLinus Torvalds 6931da177e4SLinus Torvalds return (!xfrm_policy_list[dir] && !skb->sp) || 6941da177e4SLinus Torvalds (skb->dst->flags & DST_NOPOLICY) || 6951da177e4SLinus Torvalds __xfrm_policy_check(sk, dir, skb, family); 6961da177e4SLinus Torvalds } 6971da177e4SLinus Torvalds 6981da177e4SLinus Torvalds static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 6991da177e4SLinus Torvalds { 7001da177e4SLinus Torvalds return xfrm_policy_check(sk, dir, skb, AF_INET); 7011da177e4SLinus Torvalds } 7021da177e4SLinus Torvalds 7031da177e4SLinus Torvalds static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 7041da177e4SLinus Torvalds { 7051da177e4SLinus Torvalds return xfrm_policy_check(sk, dir, skb, AF_INET6); 7061da177e4SLinus Torvalds } 7071da177e4SLinus Torvalds 7083e3850e9SPatrick McHardy extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family); 7091da177e4SLinus Torvalds extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); 7101da177e4SLinus Torvalds 7111da177e4SLinus Torvalds static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) 7121da177e4SLinus Torvalds { 7131da177e4SLinus Torvalds return !xfrm_policy_list[XFRM_POLICY_OUT] || 7141da177e4SLinus Torvalds (skb->dst->flags & DST_NOXFRM) || 7151da177e4SLinus Torvalds __xfrm_route_forward(skb, family); 7161da177e4SLinus Torvalds } 7171da177e4SLinus Torvalds 7181da177e4SLinus Torvalds static inline int xfrm4_route_forward(struct sk_buff *skb) 7191da177e4SLinus Torvalds { 7201da177e4SLinus Torvalds return xfrm_route_forward(skb, AF_INET); 7211da177e4SLinus Torvalds } 7221da177e4SLinus Torvalds 7231da177e4SLinus Torvalds static inline int xfrm6_route_forward(struct sk_buff *skb) 7241da177e4SLinus Torvalds { 7251da177e4SLinus Torvalds return xfrm_route_forward(skb, AF_INET6); 7261da177e4SLinus Torvalds } 7271da177e4SLinus Torvalds 7281da177e4SLinus Torvalds extern int __xfrm_sk_clone_policy(struct sock *sk); 7291da177e4SLinus Torvalds 7301da177e4SLinus Torvalds static inline int xfrm_sk_clone_policy(struct sock *sk) 7311da177e4SLinus Torvalds { 7321da177e4SLinus Torvalds if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) 7331da177e4SLinus Torvalds return __xfrm_sk_clone_policy(sk); 7341da177e4SLinus Torvalds return 0; 7351da177e4SLinus Torvalds } 7361da177e4SLinus Torvalds 7374666faabSHerbert Xu extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); 7381da177e4SLinus Torvalds 7391da177e4SLinus Torvalds static inline void xfrm_sk_free_policy(struct sock *sk) 7401da177e4SLinus Torvalds { 7411da177e4SLinus Torvalds if (unlikely(sk->sk_policy[0] != NULL)) { 7421da177e4SLinus Torvalds xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); 7431da177e4SLinus Torvalds sk->sk_policy[0] = NULL; 7441da177e4SLinus Torvalds } 7451da177e4SLinus Torvalds if (unlikely(sk->sk_policy[1] != NULL)) { 7461da177e4SLinus Torvalds xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); 7471da177e4SLinus Torvalds sk->sk_policy[1] = NULL; 7481da177e4SLinus Torvalds } 7491da177e4SLinus Torvalds } 7501da177e4SLinus Torvalds 7511da177e4SLinus Torvalds #else 7521da177e4SLinus Torvalds 7531da177e4SLinus Torvalds static inline void xfrm_sk_free_policy(struct sock *sk) {} 7541da177e4SLinus Torvalds static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } 7551da177e4SLinus Torvalds static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } 7561da177e4SLinus Torvalds static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 7571da177e4SLinus Torvalds static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 7581da177e4SLinus Torvalds { 7591da177e4SLinus Torvalds return 1; 7601da177e4SLinus Torvalds } 7611da177e4SLinus Torvalds static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) 7621da177e4SLinus Torvalds { 7631da177e4SLinus Torvalds return 1; 7641da177e4SLinus Torvalds } 7651da177e4SLinus Torvalds static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) 7661da177e4SLinus Torvalds { 7671da177e4SLinus Torvalds return 1; 7681da177e4SLinus Torvalds } 7691da177e4SLinus Torvalds #endif 7701da177e4SLinus Torvalds 7711da177e4SLinus Torvalds static __inline__ 7721da177e4SLinus Torvalds xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) 7731da177e4SLinus Torvalds { 7741da177e4SLinus Torvalds switch (family){ 7751da177e4SLinus Torvalds case AF_INET: 7761da177e4SLinus Torvalds return (xfrm_address_t *)&fl->fl4_dst; 7771da177e4SLinus Torvalds case AF_INET6: 7781da177e4SLinus Torvalds return (xfrm_address_t *)&fl->fl6_dst; 7791da177e4SLinus Torvalds } 7801da177e4SLinus Torvalds return NULL; 7811da177e4SLinus Torvalds } 7821da177e4SLinus Torvalds 7831da177e4SLinus Torvalds static __inline__ 7841da177e4SLinus Torvalds xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) 7851da177e4SLinus Torvalds { 7861da177e4SLinus Torvalds switch (family){ 7871da177e4SLinus Torvalds case AF_INET: 7881da177e4SLinus Torvalds return (xfrm_address_t *)&fl->fl4_src; 7891da177e4SLinus Torvalds case AF_INET6: 7901da177e4SLinus Torvalds return (xfrm_address_t *)&fl->fl6_src; 7911da177e4SLinus Torvalds } 7921da177e4SLinus Torvalds return NULL; 7931da177e4SLinus Torvalds } 7941da177e4SLinus Torvalds 7951da177e4SLinus Torvalds static __inline__ int 7961da177e4SLinus Torvalds __xfrm4_state_addr_check(struct xfrm_state *x, 7971da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr) 7981da177e4SLinus Torvalds { 7991da177e4SLinus Torvalds if (daddr->a4 == x->id.daddr.a4 && 8001da177e4SLinus Torvalds (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) 8011da177e4SLinus Torvalds return 1; 8021da177e4SLinus Torvalds return 0; 8031da177e4SLinus Torvalds } 8041da177e4SLinus Torvalds 8051da177e4SLinus Torvalds static __inline__ int 8061da177e4SLinus Torvalds __xfrm6_state_addr_check(struct xfrm_state *x, 8071da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr) 8081da177e4SLinus Torvalds { 8091da177e4SLinus Torvalds if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && 8101da177e4SLinus Torvalds (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| 8111da177e4SLinus Torvalds ipv6_addr_any((struct in6_addr *)saddr) || 8121da177e4SLinus Torvalds ipv6_addr_any((struct in6_addr *)&x->props.saddr))) 8131da177e4SLinus Torvalds return 1; 8141da177e4SLinus Torvalds return 0; 8151da177e4SLinus Torvalds } 8161da177e4SLinus Torvalds 8171da177e4SLinus Torvalds static __inline__ int 8181da177e4SLinus Torvalds xfrm_state_addr_check(struct xfrm_state *x, 8191da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr, 8201da177e4SLinus Torvalds unsigned short family) 8211da177e4SLinus Torvalds { 8221da177e4SLinus Torvalds switch (family) { 8231da177e4SLinus Torvalds case AF_INET: 8241da177e4SLinus Torvalds return __xfrm4_state_addr_check(x, daddr, saddr); 8251da177e4SLinus Torvalds case AF_INET6: 8261da177e4SLinus Torvalds return __xfrm6_state_addr_check(x, daddr, saddr); 8271da177e4SLinus Torvalds } 8281da177e4SLinus Torvalds return 0; 8291da177e4SLinus Torvalds } 8301da177e4SLinus Torvalds 8311da177e4SLinus Torvalds static inline int xfrm_state_kern(struct xfrm_state *x) 8321da177e4SLinus Torvalds { 8331da177e4SLinus Torvalds return atomic_read(&x->tunnel_users); 8341da177e4SLinus Torvalds } 8351da177e4SLinus Torvalds 8361da177e4SLinus Torvalds /* 8371da177e4SLinus Torvalds * xfrm algorithm information 8381da177e4SLinus Torvalds */ 8391da177e4SLinus Torvalds struct xfrm_algo_auth_info { 8401da177e4SLinus Torvalds u16 icv_truncbits; 8411da177e4SLinus Torvalds u16 icv_fullbits; 8421da177e4SLinus Torvalds }; 8431da177e4SLinus Torvalds 8441da177e4SLinus Torvalds struct xfrm_algo_encr_info { 8451da177e4SLinus Torvalds u16 blockbits; 8461da177e4SLinus Torvalds u16 defkeybits; 8471da177e4SLinus Torvalds }; 8481da177e4SLinus Torvalds 8491da177e4SLinus Torvalds struct xfrm_algo_comp_info { 8501da177e4SLinus Torvalds u16 threshold; 8511da177e4SLinus Torvalds }; 8521da177e4SLinus Torvalds 8531da177e4SLinus Torvalds struct xfrm_algo_desc { 8541da177e4SLinus Torvalds char *name; 8551da177e4SLinus Torvalds u8 available:1; 8561da177e4SLinus Torvalds union { 8571da177e4SLinus Torvalds struct xfrm_algo_auth_info auth; 8581da177e4SLinus Torvalds struct xfrm_algo_encr_info encr; 8591da177e4SLinus Torvalds struct xfrm_algo_comp_info comp; 8601da177e4SLinus Torvalds } uinfo; 8611da177e4SLinus Torvalds struct sadb_alg desc; 8621da177e4SLinus Torvalds }; 8631da177e4SLinus Torvalds 8641da177e4SLinus Torvalds /* XFRM tunnel handlers. */ 8651da177e4SLinus Torvalds struct xfrm_tunnel { 8661da177e4SLinus Torvalds int (*handler)(struct sk_buff *skb); 867d2acc347SHerbert Xu int (*err_handler)(struct sk_buff *skb, __u32 info); 868d2acc347SHerbert Xu 869d2acc347SHerbert Xu struct xfrm_tunnel *next; 870d2acc347SHerbert Xu int priority; 8711da177e4SLinus Torvalds }; 8721da177e4SLinus Torvalds 8731da177e4SLinus Torvalds struct xfrm6_tunnel { 874d2acc347SHerbert Xu int (*handler)(struct sk_buff *skb); 875d2acc347SHerbert Xu int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, 8761da177e4SLinus Torvalds int type, int code, int offset, __u32 info); 877d2acc347SHerbert Xu 878d2acc347SHerbert Xu struct xfrm6_tunnel *next; 879d2acc347SHerbert Xu int priority; 8801da177e4SLinus Torvalds }; 8811da177e4SLinus Torvalds 8821da177e4SLinus Torvalds extern void xfrm_init(void); 8831da177e4SLinus Torvalds extern void xfrm4_init(void); 8841da177e4SLinus Torvalds extern void xfrm6_init(void); 8851da177e4SLinus Torvalds extern void xfrm6_fini(void); 8861da177e4SLinus Torvalds extern void xfrm_state_init(void); 8871da177e4SLinus Torvalds extern void xfrm4_state_init(void); 8881da177e4SLinus Torvalds extern void xfrm6_state_init(void); 8891da177e4SLinus Torvalds extern void xfrm6_state_fini(void); 8901da177e4SLinus Torvalds 8911da177e4SLinus Torvalds extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *); 8921da177e4SLinus Torvalds extern struct xfrm_state *xfrm_state_alloc(void); 8931da177e4SLinus Torvalds extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, 8941da177e4SLinus Torvalds struct flowi *fl, struct xfrm_tmpl *tmpl, 8951da177e4SLinus Torvalds struct xfrm_policy *pol, int *err, 8961da177e4SLinus Torvalds unsigned short family); 8971da177e4SLinus Torvalds extern int xfrm_state_check_expire(struct xfrm_state *x); 8981da177e4SLinus Torvalds extern void xfrm_state_insert(struct xfrm_state *x); 8991da177e4SLinus Torvalds extern int xfrm_state_add(struct xfrm_state *x); 9001da177e4SLinus Torvalds extern int xfrm_state_update(struct xfrm_state *x); 9011da177e4SLinus Torvalds extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family); 9021da177e4SLinus Torvalds extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); 90326b15dadSJamal Hadi Salim extern int xfrm_state_delete(struct xfrm_state *x); 9041da177e4SLinus Torvalds extern void xfrm_state_flush(u8 proto); 9051da177e4SLinus Torvalds extern int xfrm_replay_check(struct xfrm_state *x, u32 seq); 9061da177e4SLinus Torvalds extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq); 907f8cd5488SJamal Hadi Salim extern void xfrm_replay_notify(struct xfrm_state *x, int event); 9081da177e4SLinus Torvalds extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb); 9091da177e4SLinus Torvalds extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); 91072cb6962SHerbert Xu extern int xfrm_init_state(struct xfrm_state *x); 9111da177e4SLinus Torvalds extern int xfrm4_rcv(struct sk_buff *skb); 9121da177e4SLinus Torvalds extern int xfrm4_output(struct sk_buff *skb); 9131da177e4SLinus Torvalds extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler); 9141da177e4SLinus Torvalds extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler); 915d2acc347SHerbert Xu extern int xfrm6_rcv_spi(struct sk_buff *skb, u32 spi); 916951dbc8aSPatrick McHardy extern int xfrm6_rcv(struct sk_buff **pskb); 9171da177e4SLinus Torvalds extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler); 9181da177e4SLinus Torvalds extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler); 9191da177e4SLinus Torvalds extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); 9201da177e4SLinus Torvalds extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); 9211da177e4SLinus Torvalds extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); 9221da177e4SLinus Torvalds extern int xfrm6_output(struct sk_buff *skb); 9231da177e4SLinus Torvalds 9241da177e4SLinus Torvalds #ifdef CONFIG_XFRM 9251da177e4SLinus Torvalds extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type); 9261da177e4SLinus Torvalds extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); 9271da177e4SLinus Torvalds extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family); 9281da177e4SLinus Torvalds #else 9291da177e4SLinus Torvalds static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) 9301da177e4SLinus Torvalds { 9311da177e4SLinus Torvalds return -ENOPROTOOPT; 9321da177e4SLinus Torvalds } 9331da177e4SLinus Torvalds 9341da177e4SLinus Torvalds static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type) 9351da177e4SLinus Torvalds { 9361da177e4SLinus Torvalds /* should not happen */ 9371da177e4SLinus Torvalds kfree_skb(skb); 9381da177e4SLinus Torvalds return 0; 9391da177e4SLinus Torvalds } 9401da177e4SLinus Torvalds static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family) 9411da177e4SLinus Torvalds { 9421da177e4SLinus Torvalds return -EINVAL; 9431da177e4SLinus Torvalds } 9441da177e4SLinus Torvalds #endif 9451da177e4SLinus Torvalds 946dd0fc66fSAl Viro struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); 9471da177e4SLinus Torvalds extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *); 9481da177e4SLinus Torvalds int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); 949df71837dSTrent Jaeger struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel, 950df71837dSTrent Jaeger struct xfrm_sec_ctx *ctx, int delete); 9511da177e4SLinus Torvalds struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete); 9521da177e4SLinus Torvalds void xfrm_policy_flush(void); 9531da177e4SLinus Torvalds u32 xfrm_get_acqseq(void); 9541da177e4SLinus Torvalds void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); 9551da177e4SLinus Torvalds struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, 9561da177e4SLinus Torvalds xfrm_address_t *daddr, xfrm_address_t *saddr, 9571da177e4SLinus Torvalds int create, unsigned short family); 9581da177e4SLinus Torvalds extern void xfrm_policy_flush(void); 9591da177e4SLinus Torvalds extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); 9601da177e4SLinus Torvalds extern int xfrm_flush_bundles(void); 961399c180aSDavid S. Miller extern void xfrm_flush_all_bundles(void); 9621da177e4SLinus Torvalds extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family); 9631da177e4SLinus Torvalds extern void xfrm_init_pmtu(struct dst_entry *dst); 9641da177e4SLinus Torvalds 9651da177e4SLinus Torvalds extern wait_queue_head_t km_waitq; 9661da177e4SLinus Torvalds extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport); 9676c5c8ca7SJamal Hadi Salim extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid); 9681da177e4SLinus Torvalds 9691da177e4SLinus Torvalds extern void xfrm_input_init(void); 9701da177e4SLinus Torvalds extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq); 9711da177e4SLinus Torvalds 9721da177e4SLinus Torvalds extern void xfrm_probe_algs(void); 9731da177e4SLinus Torvalds extern int xfrm_count_auth_supported(void); 9741da177e4SLinus Torvalds extern int xfrm_count_enc_supported(void); 9751da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); 9761da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); 9771da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); 9781da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); 9791da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); 9801da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); 9811da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); 9821da177e4SLinus Torvalds extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); 9831da177e4SLinus Torvalds 9841da177e4SLinus Torvalds struct crypto_tfm; 9851da177e4SLinus Torvalds typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int); 9861da177e4SLinus Torvalds 9871da177e4SLinus Torvalds extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm, 9881da177e4SLinus Torvalds int offset, int len, icv_update_fn_t icv_update); 9891da177e4SLinus Torvalds 9901da177e4SLinus Torvalds static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, 9911da177e4SLinus Torvalds int family) 9921da177e4SLinus Torvalds { 9931da177e4SLinus Torvalds switch (family) { 9941da177e4SLinus Torvalds default: 9951da177e4SLinus Torvalds case AF_INET: 9961da177e4SLinus Torvalds return a->a4 - b->a4; 9971da177e4SLinus Torvalds case AF_INET6: 9981da177e4SLinus Torvalds return ipv6_addr_cmp((struct in6_addr *)a, 9991da177e4SLinus Torvalds (struct in6_addr *)b); 10001da177e4SLinus Torvalds } 10011da177e4SLinus Torvalds } 10021da177e4SLinus Torvalds 100377d8d7a6SHerbert Xu static inline int xfrm_policy_id2dir(u32 index) 100477d8d7a6SHerbert Xu { 100577d8d7a6SHerbert Xu return index & 7; 100677d8d7a6SHerbert Xu } 100777d8d7a6SHerbert Xu 1008f8cd5488SJamal Hadi Salim static inline int xfrm_aevent_is_on(void) 1009f8cd5488SJamal Hadi Salim { 1010be33690dSPatrick McHardy struct sock *nlsk; 1011be33690dSPatrick McHardy int ret = 0; 1012be33690dSPatrick McHardy 1013be33690dSPatrick McHardy rcu_read_lock(); 1014be33690dSPatrick McHardy nlsk = rcu_dereference(xfrm_nl); 1015be33690dSPatrick McHardy if (nlsk) 1016be33690dSPatrick McHardy ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); 1017be33690dSPatrick McHardy rcu_read_unlock(); 1018be33690dSPatrick McHardy return ret; 1019f8cd5488SJamal Hadi Salim } 1020f8cd5488SJamal Hadi Salim 1021f8cd5488SJamal Hadi Salim static inline void xfrm_aevent_doreplay(struct xfrm_state *x) 1022f8cd5488SJamal Hadi Salim { 1023f8cd5488SJamal Hadi Salim if (xfrm_aevent_is_on()) 1024f8cd5488SJamal Hadi Salim xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); 1025f8cd5488SJamal Hadi Salim } 1026f8cd5488SJamal Hadi Salim 1027f8cd5488SJamal Hadi Salim 10281da177e4SLinus Torvalds #endif /* _NET_XFRM_H */ 1029