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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _NET_XFRM_H
2#define _NET_XFRM_H
3
Herbert Xuaabc9762005-05-03 16:27:10 -07004#include <linux/compiler.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -02005#include <linux/in.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006#include <linux/xfrm.h>
7#include <linux/spinlock.h>
8#include <linux/list.h>
9#include <linux/skbuff.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020010#include <linux/socket.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/pfkeyv2.h>
Masahide NAKAMURA57947082006-09-22 15:06:24 -070012#include <linux/ipsec.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/in6.h>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080014#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
16#include <net/sock.h>
17#include <net/dst.h>
18#include <net/route.h>
19#include <net/ipv6.h>
20#include <net/ip6_fib.h>
21
22#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
Herbert Xub59f45d2006-05-27 23:05:54 -070023#define MODULE_ALIAS_XFRM_MODE(family, encap) \
24 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -080026extern struct sock *xfrm_nl;
27extern u32 sysctl_xfrm_aevent_etime;
28extern u32 sysctl_xfrm_aevent_rseqth;
29
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080030extern struct mutex xfrm_cfg_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32/* Organization of SPD aka "XFRM rules"
33 ------------------------------------
34
35 Basic objects:
36 - policy rule, struct xfrm_policy (=SPD entry)
37 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
38 - instance of a transformer, struct xfrm_state (=SA)
39 - template to clone xfrm_state, struct xfrm_tmpl
40
41 SPD is plain linear list of xfrm_policy rules, ordered by priority.
42 (To be compatible with existing pfkeyv2 implementations,
43 many rules with priority of 0x7fffffff are allowed to exist and
44 such rules are ordered in an unpredictable way, thanks to bsd folks.)
45
46 Lookup is plain linear search until the first match with selector.
47
48 If "action" is "block", then we prohibit the flow, otherwise:
49 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
50 policy entry has list of up to XFRM_MAX_DEPTH transformations,
51 described by templates xfrm_tmpl. Each template is resolved
52 to a complete xfrm_state (see below) and we pack bundle of transformations
53 to a dst_entry returned to requestor.
54
55 dst -. xfrm .-> xfrm_state #1
56 |---. child .-> dst -. xfrm .-> xfrm_state #2
57 |---. child .-> dst -. xfrm .-> xfrm_state #3
58 |---. child .-> NULL
59
60 Bundles are cached at xrfm_policy struct (field ->bundles).
61
62
63 Resolution of xrfm_tmpl
64 -----------------------
65 Template contains:
66 1. ->mode Mode: transport or tunnel
67 2. ->id.proto Protocol: AH/ESP/IPCOMP
68 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
69 Q: allow to resolve security gateway?
70 4. ->id.spi If not zero, static SPI.
71 5. ->saddr Local tunnel endpoint, ignored for transport mode.
72 6. ->algos List of allowed algos. Plain bitmask now.
73 Q: ealgos, aalgos, calgos. What a mess...
74 7. ->share Sharing mode.
75 Q: how to implement private sharing mode? To add struct sock* to
76 flow id?
77
78 Having this template we search through SAD searching for entries
79 with appropriate mode/proto/algo, permitted by selector.
80 If no appropriate entry found, it is requested from key manager.
81
82 PROBLEMS:
83 Q: How to find all the bundles referring to a physical path for
84 PMTU discovery? Seems, dst should contain list of all parents...
85 and enter to infinite locking hierarchy disaster.
86 No! It is easier, we will not search for them, let them find us.
87 We add genid to each dst plus pointer to genid of raw IP route,
88 pmtu disc will update pmtu on raw IP route and increase its genid.
89 dst_check() will see this for top level and trigger resyncing
90 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
91 */
92
93/* Full description of state of transformer. */
94struct xfrm_state
95{
96 /* Note: bydst is re-used during gc */
David S. Miller8f126e32006-08-24 02:45:07 -070097 struct hlist_node bydst;
98 struct hlist_node bysrc;
99 struct hlist_node byspi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101 atomic_t refcnt;
102 spinlock_t lock;
103
104 struct xfrm_id id;
105 struct xfrm_selector sel;
106
David S. Miller9d4a7062006-08-24 03:18:09 -0700107 u32 genid;
108
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 /* Key manger bits */
110 struct {
111 u8 state;
112 u8 dying;
113 u32 seq;
114 } km;
115
116 /* Parameters of this state. */
117 struct {
118 u32 reqid;
119 u8 mode;
120 u8 replay_window;
121 u8 aalgo, ealgo, calgo;
122 u8 flags;
123 u16 family;
124 xfrm_address_t saddr;
125 int header_len;
126 int trailer_len;
127 } props;
128
129 struct xfrm_lifetime_cfg lft;
130
131 /* Data for transformer */
132 struct xfrm_algo *aalg;
133 struct xfrm_algo *ealg;
134 struct xfrm_algo *calg;
135
136 /* Data for encapsulator */
137 struct xfrm_encap_tmpl *encap;
138
Noriaki TAKAMIYA060f02a2006-08-23 18:18:55 -0700139 /* Data for care-of address */
140 xfrm_address_t *coaddr;
141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
143 struct xfrm_state *tunnel;
144
145 /* If a tunnel, number of users + 1 */
146 atomic_t tunnel_users;
147
148 /* State for replay detection */
149 struct xfrm_replay_state replay;
150
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800151 /* Replay detection state at the time we sent the last notification */
152 struct xfrm_replay_state preplay;
153
Jamal Hadi Salim27170962006-04-14 15:03:05 -0700154 /* internal flag that only holds state for delayed aevent at the
155 * moment
156 */
157 u32 xflags;
158
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800159 /* Replay detection notification settings */
160 u32 replay_maxage;
161 u32 replay_maxdiff;
162
163 /* Replay detection notification timer */
164 struct timer_list rtimer;
165
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 /* Statistics */
167 struct xfrm_stats stats;
168
169 struct xfrm_lifetime_cur curlft;
170 struct timer_list timer;
171
Masahide NAKAMURA9afaca02006-08-23 18:20:16 -0700172 /* Last used time */
173 u64 lastused;
174
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 /* Reference to data common to all the instances of this
176 * transformer. */
177 struct xfrm_type *type;
Herbert Xub59f45d2006-05-27 23:05:54 -0700178 struct xfrm_mode *mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
Trent Jaegerdf718372005-12-13 23:12:27 -0800180 /* Security context */
181 struct xfrm_sec_ctx *security;
182
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 /* Private data of this transformer, format is opaque,
184 * interpreted by xfrm_type methods. */
185 void *data;
186};
187
Jamal Hadi Salim27170962006-04-14 15:03:05 -0700188/* xflags - make enum if more show up */
189#define XFRM_TIME_DEFER 1
190
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191enum {
192 XFRM_STATE_VOID,
193 XFRM_STATE_ACQ,
194 XFRM_STATE_VALID,
195 XFRM_STATE_ERROR,
196 XFRM_STATE_EXPIRED,
197 XFRM_STATE_DEAD
198};
199
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700200/* callback structure passed from either netlink or pfkey */
201struct km_event
202{
Herbert Xubf088672005-06-18 22:44:00 -0700203 union {
204 u32 hard;
205 u32 proto;
206 u32 byid;
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800207 u32 aevent;
Masahide NAKAMURAf7b69832006-08-23 22:49:28 -0700208 u32 type;
Herbert Xubf088672005-06-18 22:44:00 -0700209 } data;
210
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700211 u32 seq;
212 u32 pid;
213 u32 event;
214};
215
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216struct xfrm_type;
217struct xfrm_dst;
218struct xfrm_policy_afinfo {
219 unsigned short family;
Herbert Xu73654d62006-05-27 23:06:33 -0700220 struct xfrm_type *type_map[IPPROTO_MAX];
Herbert Xub59f45d2006-05-27 23:05:54 -0700221 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 struct dst_ops *dst_ops;
223 void (*garbage_collect)(void);
224 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
Patrick McHardya1e59ab2006-09-19 12:57:34 -0700225 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
227 int (*bundle_create)(struct xfrm_policy *policy,
228 struct xfrm_state **xfrm,
229 int nx,
230 struct flowi *fl,
231 struct dst_entry **dst_p);
232 void (*decode_session)(struct sk_buff *skb,
233 struct flowi *fl);
234};
235
236extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
237extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700238extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
239extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240#define XFRM_ACQ_EXPIRES 30
241
242struct xfrm_tmpl;
Jamal Hadi Salim980ebd22006-03-20 19:16:40 -0800243extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
Jamal Hadi Salim53bc6b42006-03-20 19:17:03 -0800244extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
245extern int __xfrm_state_delete(struct xfrm_state *x);
246
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247struct xfrm_state_afinfo {
248 unsigned short family;
Herbert Xud094cd82005-06-20 13:19:41 -0700249 int (*init_flags)(struct xfrm_state *x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
251 struct xfrm_tmpl *tmpl,
252 xfrm_address_t *daddr, xfrm_address_t *saddr);
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -0700253 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
254 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
Miika Komucdca7262007-02-06 14:24:56 -0800255 int (*output)(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256};
257
258extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
259extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
Miika Komucdca7262007-02-06 14:24:56 -0800260extern struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family);
261extern void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
263extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
264
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265struct xfrm_type
266{
267 char *description;
268 struct module *owner;
269 __u8 proto;
Masahide NAKAMURA1b5c2292006-08-23 18:11:50 -0700270 __u8 flags;
271#define XFRM_TYPE_NON_FRAGMENT 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
Herbert Xu72cb6962005-06-20 13:18:08 -0700273 int (*init_state)(struct xfrm_state *x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 void (*destructor)(struct xfrm_state *);
Herbert Xue6956332006-04-01 00:52:46 -0800275 int (*input)(struct xfrm_state *, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -0700277 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
Masahide NAKAMURAaee5adb2006-08-23 17:57:28 -0700278 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
Masahide NAKAMURA99505a82006-08-23 18:10:33 -0700279 xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *);
280 xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 /* Estimate maximal size of result of transformation of a dgram */
Patrick McHardyc5c25232007-04-09 11:47:18 -0700282 u32 (*get_mtu)(struct xfrm_state *, int size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283};
284
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
286extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
287extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
288extern void xfrm_put_type(struct xfrm_type *type);
289
Herbert Xub59f45d2006-05-27 23:05:54 -0700290struct xfrm_mode {
291 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
Jamal Hadi Salimeb878e82006-08-31 17:42:59 -0700292 int (*output)(struct xfrm_state *x,struct sk_buff *skb);
Herbert Xub59f45d2006-05-27 23:05:54 -0700293
294 struct module *owner;
295 unsigned int encap;
296};
297
298extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
299extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
300extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family);
301extern void xfrm_put_mode(struct xfrm_mode *mode);
302
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303struct xfrm_tmpl
304{
305/* id in template is interpreted as:
306 * daddr - destination of tunnel, may be zero for transport mode.
307 * spi - zero to acquire spi. Not zero if spi is static, then
308 * daddr must be fixed too.
309 * proto - AH/ESP/IPCOMP
310 */
311 struct xfrm_id id;
312
313/* Source address of tunnel. Ignored, if it is not a tunnel. */
314 xfrm_address_t saddr;
315
Miika Komu76b3f052006-11-30 16:40:43 -0800316 unsigned short encap_family;
317
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 __u32 reqid;
319
Masahide NAKAMURA7e49e6d2006-09-22 15:05:15 -0700320/* Mode: transport, tunnel etc. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 __u8 mode;
322
323/* Sharing mode: unique, this session only, this user only etc. */
324 __u8 share;
325
326/* May skip this transfomration if no SA is found */
327 __u8 optional;
328
329/* Bit mask of algos allowed for acquisition */
330 __u32 aalgos;
331 __u32 ealgos;
332 __u32 calgos;
333};
334
Masahide NAKAMURA622dc822006-08-23 17:52:01 -0700335#define XFRM_MAX_DEPTH 6
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
337struct xfrm_policy
338{
339 struct xfrm_policy *next;
David S. Miller2518c7c2006-08-24 04:45:07 -0700340 struct hlist_node bydst;
341 struct hlist_node byidx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
343 /* This lock only affects elements except for entry. */
344 rwlock_t lock;
345 atomic_t refcnt;
346 struct timer_list timer;
347
348 u32 priority;
349 u32 index;
350 struct xfrm_selector selector;
351 struct xfrm_lifetime_cfg lft;
352 struct xfrm_lifetime_cur curlft;
353 struct dst_entry *bundles;
Arnaldo Carvalho de Melo46ca5f52006-11-27 17:58:59 -0200354 u16 family;
355 u8 type;
356 u8 action;
357 u8 flags;
358 u8 dead;
359 u8 xfrm_nr;
360 /* XXX 1 byte hole, try to pack */
Trent Jaegerdf718372005-12-13 23:12:27 -0800361 struct xfrm_sec_ctx *security;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
363};
364
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -0800365struct xfrm_migrate {
366 xfrm_address_t old_daddr;
367 xfrm_address_t old_saddr;
368 xfrm_address_t new_daddr;
369 xfrm_address_t new_saddr;
370 u8 proto;
371 u8 mode;
372 u16 reserved;
373 u32 reqid;
374 u16 old_family;
375 u16 new_family;
376};
377
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800378#define XFRM_KM_TIMEOUT 30
379/* which seqno */
380#define XFRM_REPLAY_SEQ 1
381#define XFRM_REPLAY_OSEQ 2
382#define XFRM_REPLAY_SEQ_MASK 3
383/* what happened */
384#define XFRM_REPLAY_UPDATE XFRM_AE_CR
385#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
386
387/* default aevent timeout in units of 100ms */
388#define XFRM_AE_ETIME 10
389/* Async Event timer multiplier */
390#define XFRM_AE_ETH_M 10
391/* default seq threshold size */
392#define XFRM_AE_SEQT_SIZE 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
394struct xfrm_mgr
395{
396 struct list_head list;
397 char *id;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700398 int (*notify)(struct xfrm_state *x, struct km_event *c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
Venkat Yekkiralacb969f02006-07-24 23:32:20 -0700400 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
Al Viro5d36b182006-11-08 00:24:06 -0800401 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700402 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
Masahide NAKAMURA97a64b42006-08-23 20:44:06 -0700403 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -0800404 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405};
406
407extern int xfrm_register_km(struct xfrm_mgr *km);
408extern int xfrm_unregister_km(struct xfrm_mgr *km);
409
David S. Miller2518c7c2006-08-24 04:45:07 -0700410extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
Joy Latten161a09e2006-11-27 13:11:54 -0600412/* Audit Information */
413struct xfrm_audit
414{
415 uid_t loginuid;
416 u32 secid;
417};
Joy Lattenc9204d92006-11-30 15:50:43 -0600418
419#ifdef CONFIG_AUDITSYSCALL
420extern void xfrm_audit_log(uid_t auid, u32 secid, int type, int result,
Joy Latten161a09e2006-11-27 13:11:54 -0600421 struct xfrm_policy *xp, struct xfrm_state *x);
Joy Lattenc9204d92006-11-30 15:50:43 -0600422#else
423#define xfrm_audit_log(a,s,t,r,p,x) do { ; } while (0)
424#endif /* CONFIG_AUDITSYSCALL */
Joy Latten161a09e2006-11-27 13:11:54 -0600425
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426static inline void xfrm_pol_hold(struct xfrm_policy *policy)
427{
428 if (likely(policy != NULL))
429 atomic_inc(&policy->refcnt);
430}
431
432extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
433
434static inline void xfrm_pol_put(struct xfrm_policy *policy)
435{
436 if (atomic_dec_and_test(&policy->refcnt))
437 __xfrm_policy_destroy(policy);
438}
439
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700440#ifdef CONFIG_XFRM_SUB_POLICY
441static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
442{
443 int i;
444 for (i = npols - 1; i >= 0; --i)
445 xfrm_pol_put(pols[i]);
446}
447#else
448static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
449{
450 xfrm_pol_put(pols[0]);
451}
452#endif
453
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454extern void __xfrm_state_destroy(struct xfrm_state *);
455
Herbert Xu21380b82006-02-22 14:47:13 -0800456static inline void __xfrm_state_put(struct xfrm_state *x)
457{
458 atomic_dec(&x->refcnt);
459}
460
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461static inline void xfrm_state_put(struct xfrm_state *x)
462{
463 if (atomic_dec_and_test(&x->refcnt))
464 __xfrm_state_destroy(x);
465}
466
467static inline void xfrm_state_hold(struct xfrm_state *x)
468{
469 atomic_inc(&x->refcnt);
470}
471
472static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
473{
Al Viro5f193432006-09-27 18:46:32 -0700474 __be32 *a1 = token1;
475 __be32 *a2 = token2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 int pdw;
477 int pbi;
478
479 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
480 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
481
482 if (pdw)
483 if (memcmp(a1, a2, pdw << 2))
484 return 0;
485
486 if (pbi) {
Al Viro5f193432006-09-27 18:46:32 -0700487 __be32 mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
489 mask = htonl((0xffffffff) << (32 - pbi));
490
491 if ((a1[pdw] ^ a2[pdw]) & mask)
492 return 0;
493 }
494
495 return 1;
496}
497
498static __inline__
Al Virof9d07e41f82006-09-27 18:45:50 -0700499__be16 xfrm_flowi_sport(struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500{
Al Virof9d07e41f82006-09-27 18:45:50 -0700501 __be16 port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 switch(fl->proto) {
503 case IPPROTO_TCP:
504 case IPPROTO_UDP:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800505 case IPPROTO_UDPLITE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 case IPPROTO_SCTP:
507 port = fl->fl_ip_sport;
508 break;
509 case IPPROTO_ICMP:
510 case IPPROTO_ICMPV6:
511 port = htons(fl->fl_icmp_type);
512 break;
Masahide NAKAMURA2ce42722006-08-23 20:39:03 -0700513#ifdef CONFIG_IPV6_MIP6
514 case IPPROTO_MH:
515 port = htons(fl->fl_mh_type);
516 break;
517#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 default:
519 port = 0; /*XXX*/
520 }
521 return port;
522}
523
524static __inline__
Al Virof9d07e41f82006-09-27 18:45:50 -0700525__be16 xfrm_flowi_dport(struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526{
Al Virof9d07e41f82006-09-27 18:45:50 -0700527 __be16 port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 switch(fl->proto) {
529 case IPPROTO_TCP:
530 case IPPROTO_UDP:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800531 case IPPROTO_UDPLITE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 case IPPROTO_SCTP:
533 port = fl->fl_ip_dport;
534 break;
535 case IPPROTO_ICMP:
536 case IPPROTO_ICMPV6:
537 port = htons(fl->fl_icmp_code);
538 break;
539 default:
540 port = 0; /*XXX*/
541 }
542 return port;
543}
544
Andrew Morton77681022006-11-08 22:46:26 -0800545extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
546 unsigned short family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547
Trent Jaegerdf718372005-12-13 23:12:27 -0800548#ifdef CONFIG_SECURITY_NETWORK_XFRM
549/* If neither has a context --> match
550 * Otherwise, both must have a context and the sids, doi, alg must match
551 */
552static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
553{
554 return ((!s1 && !s2) ||
555 (s1 && s2 &&
556 (s1->ctx_sid == s2->ctx_sid) &&
557 (s1->ctx_doi == s2->ctx_doi) &&
558 (s1->ctx_alg == s2->ctx_alg)));
559}
560#else
561static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
562{
563 return 1;
564}
565#endif
566
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567/* A struct encoding bundle of transformations to apply to some set of flow.
568 *
569 * dst->child points to the next element of bundle.
570 * dst->xfrm points to an instanse of transformer.
571 *
572 * Due to unfortunate limitations of current routing cache, which we
573 * have no time to fix, it mirrors struct rtable and bound to the same
574 * routing key, including saddr,daddr. However, we can have many of
575 * bundles differing by session id. All the bundles grow from a parent
576 * policy rule.
577 */
578struct xfrm_dst
579{
580 union {
581 struct xfrm_dst *next;
582 struct dst_entry dst;
583 struct rtable rt;
584 struct rt6_info rt6;
585 } u;
586 struct dst_entry *route;
Masahide NAKAMURA157bfc22007-04-30 00:33:35 -0700587#ifdef CONFIG_XFRM_SUB_POLICY
588 struct flowi *origin;
589 struct xfrm_selector *partner;
590#endif
David S. Miller9d4a7062006-08-24 03:18:09 -0700591 u32 genid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 u32 route_mtu_cached;
593 u32 child_mtu_cached;
Hideaki YOSHIFUJI92d63dec2005-05-26 12:58:04 -0700594 u32 route_cookie;
595 u32 path_cookie;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596};
597
Herbert Xuaabc9762005-05-03 16:27:10 -0700598static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
599{
600 dst_release(xdst->route);
601 if (likely(xdst->u.dst.xfrm))
602 xfrm_state_put(xdst->u.dst.xfrm);
Masahide NAKAMURA157bfc22007-04-30 00:33:35 -0700603#ifdef CONFIG_XFRM_SUB_POLICY
604 kfree(xdst->origin);
605 xdst->origin = NULL;
606 kfree(xdst->partner);
607 xdst->partner = NULL;
608#endif
Herbert Xuaabc9762005-05-03 16:27:10 -0700609}
610
611extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
612
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613struct sec_path
614{
615 atomic_t refcnt;
616 int len;
Herbert Xudbe5b4a2006-04-01 00:54:16 -0800617 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618};
619
620static inline struct sec_path *
621secpath_get(struct sec_path *sp)
622{
623 if (sp)
624 atomic_inc(&sp->refcnt);
625 return sp;
626}
627
628extern void __secpath_destroy(struct sec_path *sp);
629
630static inline void
631secpath_put(struct sec_path *sp)
632{
633 if (sp && atomic_dec_and_test(&sp->refcnt))
634 __secpath_destroy(sp);
635}
636
637extern struct sec_path *secpath_dup(struct sec_path *src);
638
639static inline void
640secpath_reset(struct sk_buff *skb)
641{
642#ifdef CONFIG_XFRM
643 secpath_put(skb->sp);
644 skb->sp = NULL;
645#endif
646}
647
648static inline int
Patrick McHardya1e59ab2006-09-19 12:57:34 -0700649xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
650{
651 switch (family) {
652 case AF_INET:
653 return addr->a4 == 0;
654 case AF_INET6:
655 return ipv6_addr_any((struct in6_addr *)&addr->a6);
656 }
657 return 0;
658}
659
660static inline int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661__xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
662{
663 return (tmpl->saddr.a4 &&
664 tmpl->saddr.a4 != x->props.saddr.a4);
665}
666
667static inline int
668__xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
669{
670 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
671 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
672}
673
674static inline int
675xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
676{
677 switch (family) {
678 case AF_INET:
679 return __xfrm4_state_addr_cmp(tmpl, x);
680 case AF_INET6:
681 return __xfrm6_state_addr_cmp(tmpl, x);
682 }
683 return !0;
684}
685
686#ifdef CONFIG_XFRM
687
688extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
689
690static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
691{
692 if (sk && sk->sk_policy[XFRM_POLICY_IN])
693 return __xfrm_policy_check(sk, dir, skb, family);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700694
David S. Miller2518c7c2006-08-24 04:45:07 -0700695 return (!xfrm_policy_count[dir] && !skb->sp) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 (skb->dst->flags & DST_NOPOLICY) ||
697 __xfrm_policy_check(sk, dir, skb, family);
698}
699
700static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
701{
702 return xfrm_policy_check(sk, dir, skb, AF_INET);
703}
704
705static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
706{
707 return xfrm_policy_check(sk, dir, skb, AF_INET6);
708}
709
Patrick McHardy3e3850e2006-01-06 23:04:54 -0800710extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
712
713static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
714{
David S. Miller2518c7c2006-08-24 04:45:07 -0700715 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 (skb->dst->flags & DST_NOXFRM) ||
717 __xfrm_route_forward(skb, family);
718}
719
720static inline int xfrm4_route_forward(struct sk_buff *skb)
721{
722 return xfrm_route_forward(skb, AF_INET);
723}
724
725static inline int xfrm6_route_forward(struct sk_buff *skb)
726{
727 return xfrm_route_forward(skb, AF_INET6);
728}
729
730extern int __xfrm_sk_clone_policy(struct sock *sk);
731
732static inline int xfrm_sk_clone_policy(struct sock *sk)
733{
734 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
735 return __xfrm_sk_clone_policy(sk);
736 return 0;
737}
738
Herbert Xu4666faa2005-06-18 22:43:22 -0700739extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740
741static inline void xfrm_sk_free_policy(struct sock *sk)
742{
743 if (unlikely(sk->sk_policy[0] != NULL)) {
744 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
745 sk->sk_policy[0] = NULL;
746 }
747 if (unlikely(sk->sk_policy[1] != NULL)) {
748 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
749 sk->sk_policy[1] = NULL;
750 }
751}
752
753#else
754
755static inline void xfrm_sk_free_policy(struct sock *sk) {}
756static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
757static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
758static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
759static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
760{
761 return 1;
762}
763static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
764{
765 return 1;
766}
767static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
768{
769 return 1;
770}
771#endif
772
773static __inline__
774xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
775{
776 switch (family){
777 case AF_INET:
778 return (xfrm_address_t *)&fl->fl4_dst;
779 case AF_INET6:
780 return (xfrm_address_t *)&fl->fl6_dst;
781 }
782 return NULL;
783}
784
785static __inline__
786xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
787{
788 switch (family){
789 case AF_INET:
790 return (xfrm_address_t *)&fl->fl4_src;
791 case AF_INET6:
792 return (xfrm_address_t *)&fl->fl6_src;
793 }
794 return NULL;
795}
796
797static __inline__ int
798__xfrm4_state_addr_check(struct xfrm_state *x,
799 xfrm_address_t *daddr, xfrm_address_t *saddr)
800{
801 if (daddr->a4 == x->id.daddr.a4 &&
802 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
803 return 1;
804 return 0;
805}
806
807static __inline__ int
808__xfrm6_state_addr_check(struct xfrm_state *x,
809 xfrm_address_t *daddr, xfrm_address_t *saddr)
810{
811 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
812 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
813 ipv6_addr_any((struct in6_addr *)saddr) ||
814 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
815 return 1;
816 return 0;
817}
818
819static __inline__ int
820xfrm_state_addr_check(struct xfrm_state *x,
821 xfrm_address_t *daddr, xfrm_address_t *saddr,
822 unsigned short family)
823{
824 switch (family) {
825 case AF_INET:
826 return __xfrm4_state_addr_check(x, daddr, saddr);
827 case AF_INET6:
828 return __xfrm6_state_addr_check(x, daddr, saddr);
829 }
830 return 0;
831}
832
Masahide NAKAMURAe53820d2006-08-23 19:12:01 -0700833static __inline__ int
834xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
835 unsigned short family)
836{
837 switch (family) {
838 case AF_INET:
839 return __xfrm4_state_addr_check(x,
840 (xfrm_address_t *)&fl->fl4_dst,
841 (xfrm_address_t *)&fl->fl4_src);
842 case AF_INET6:
843 return __xfrm6_state_addr_check(x,
844 (xfrm_address_t *)&fl->fl6_dst,
845 (xfrm_address_t *)&fl->fl6_src);
846 }
847 return 0;
848}
849
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850static inline int xfrm_state_kern(struct xfrm_state *x)
851{
852 return atomic_read(&x->tunnel_users);
853}
854
Masahide NAKAMURA57947082006-09-22 15:06:24 -0700855static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
856{
Masahide NAKAMURAdc00a522006-08-23 17:49:52 -0700857 return (!userproto || proto == userproto ||
858 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
859 proto == IPPROTO_ESP ||
860 proto == IPPROTO_COMP)));
Masahide NAKAMURA57947082006-09-22 15:06:24 -0700861}
862
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863/*
864 * xfrm algorithm information
865 */
866struct xfrm_algo_auth_info {
867 u16 icv_truncbits;
868 u16 icv_fullbits;
869};
870
871struct xfrm_algo_encr_info {
872 u16 blockbits;
873 u16 defkeybits;
874};
875
876struct xfrm_algo_comp_info {
877 u16 threshold;
878};
879
880struct xfrm_algo_desc {
881 char *name;
Herbert Xu04ff1262006-08-13 08:50:00 +1000882 char *compat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 u8 available:1;
884 union {
885 struct xfrm_algo_auth_info auth;
886 struct xfrm_algo_encr_info encr;
887 struct xfrm_algo_comp_info comp;
888 } uinfo;
889 struct sadb_alg desc;
890};
891
892/* XFRM tunnel handlers. */
893struct xfrm_tunnel {
894 int (*handler)(struct sk_buff *skb);
Herbert Xud2acc342006-03-28 01:12:13 -0800895 int (*err_handler)(struct sk_buff *skb, __u32 info);
896
897 struct xfrm_tunnel *next;
898 int priority;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899};
900
901struct xfrm6_tunnel {
Herbert Xud2acc342006-03-28 01:12:13 -0800902 int (*handler)(struct sk_buff *skb);
903 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
Al Viro04ce6902006-11-08 00:21:01 -0800904 int type, int code, int offset, __be32 info);
Herbert Xud2acc342006-03-28 01:12:13 -0800905 struct xfrm6_tunnel *next;
906 int priority;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907};
908
909extern void xfrm_init(void);
910extern void xfrm4_init(void);
911extern void xfrm6_init(void);
912extern void xfrm6_fini(void);
913extern void xfrm_state_init(void);
914extern void xfrm4_state_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915extern void xfrm6_state_init(void);
916extern void xfrm6_state_fini(void);
917
918extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
919extern struct xfrm_state *xfrm_state_alloc(void);
920extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
921 struct flowi *fl, struct xfrm_tmpl *tmpl,
922 struct xfrm_policy *pol, int *err,
923 unsigned short family);
924extern int xfrm_state_check_expire(struct xfrm_state *x);
925extern void xfrm_state_insert(struct xfrm_state *x);
926extern int xfrm_state_add(struct xfrm_state *x);
927extern int xfrm_state_update(struct xfrm_state *x);
Al Viroa94cfd12006-09-27 18:47:24 -0700928extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
Masahide NAKAMURAeb2971b2006-08-23 17:56:04 -0700929extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -0700930#ifdef CONFIG_XFRM_SUB_POLICY
931extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
932 int n, unsigned short family);
933extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
934 int n, unsigned short family);
935#else
936static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
937 int n, unsigned short family)
938{
939 return -ENOSYS;
940}
941
942static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
943 int n, unsigned short family)
944{
945 return -ENOSYS;
946}
947#endif
Jamal Hadi Salimaf11e312007-05-04 12:55:13 -0700948
949struct xfrmk_sadinfo {
950 u32 sadhcnt; /* current hash bkts */
951 u32 sadhmcnt; /* max allowed hash bkts */
952 u32 sadcnt; /* current running count */
953};
954
Jamal Hadi Salim5a6d3412007-05-04 12:55:39 -0700955struct xfrmk_spdinfo {
956 u32 incnt;
957 u32 outcnt;
958 u32 fwdcnt;
959 u32 inscnt;
960 u32 outscnt;
961 u32 fwdscnt;
962 u32 spdhcnt;
963 u32 spdhmcnt;
964};
965
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700967extern int xfrm_state_delete(struct xfrm_state *x);
Joy Latten161a09e2006-11-27 13:11:54 -0600968extern void xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
Jamal Hadi Salimaf11e312007-05-04 12:55:13 -0700969extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
Jamal Hadi Salim5a6d3412007-05-04 12:55:39 -0700970extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
Al Viroa252cc22006-09-27 18:48:18 -0700971extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
Al Viro61f46272006-09-27 18:48:33 -0700972extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800973extern void xfrm_replay_notify(struct xfrm_state *x, int event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
975extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
Herbert Xu72cb6962005-06-20 13:18:08 -0700976extern int xfrm_init_state(struct xfrm_state *x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977extern int xfrm4_rcv(struct sk_buff *skb);
978extern int xfrm4_output(struct sk_buff *skb);
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -0800979extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
980extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
Al Viroa252cc22006-09-27 18:48:18 -0700981extern int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi);
Patrick McHardy951dbc82006-01-06 23:02:34 -0800982extern int xfrm6_rcv(struct sk_buff **pskb);
Masahide NAKAMURAfbd9a5b2006-08-23 18:08:21 -0700983extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
984 xfrm_address_t *saddr, u8 proto);
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -0800985extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
986extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
Al Viro8c689a62006-11-08 00:20:21 -0800987extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
Al Viro8c689a62006-11-08 00:20:21 -0800989extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990extern int xfrm6_output(struct sk_buff *skb);
Masahide NAKAMURAaee5adb2006-08-23 17:57:28 -0700991extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
992 u8 **prevhdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993
994#ifdef CONFIG_XFRM
995extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
996extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
997extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
998#else
999static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1000{
1001 return -ENOPROTOOPT;
1002}
1003
1004static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
1005{
1006 /* should not happen */
1007 kfree_skb(skb);
1008 return 0;
1009}
1010static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
1011{
1012 return -EINVAL;
1013}
1014#endif
1015
Al Virodd0fc662005-10-07 07:46:04 +01001016struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001017extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001019struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1020 struct xfrm_selector *sel,
Eric Parisef41aaa2007-03-07 15:37:58 -08001021 struct xfrm_sec_ctx *ctx, int delete,
1022 int *err);
1023struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
Joy Latten161a09e2006-11-27 13:11:54 -06001024void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025u32 xfrm_get_acqseq(void);
Al Viro26977b42006-09-27 18:47:05 -07001026void xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi);
Joy Latten161a09e2006-11-27 13:11:54 -06001027struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1028 xfrm_address_t *daddr, xfrm_address_t *saddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 int create, unsigned short family);
Joy Latten161a09e2006-11-27 13:11:54 -06001030extern void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
Venkat Yekkirala5b368e62006-10-05 15:42:18 -05001032extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1033 struct flowi *fl, int family, int strict);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034extern void xfrm_init_pmtu(struct dst_entry *dst);
1035
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001036#ifdef CONFIG_XFRM_MIGRATE
1037extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1038 struct xfrm_migrate *m, int num_bundles);
1039extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1040extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1041 struct xfrm_migrate *m);
1042extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1043 struct xfrm_migrate *m, int num_bundles);
1044#endif
1045
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046extern wait_queue_head_t km_waitq;
Al Viro5d36b182006-11-08 00:24:06 -08001047extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
Jamal Hadi Salim6c5c8ca2006-03-20 19:17:25 -08001048extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
Masahide NAKAMURA97a64b42006-08-23 20:44:06 -07001049extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050
1051extern void xfrm_input_init(void);
Al Viro6067b2b2006-09-27 18:47:59 -07001052extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053
1054extern void xfrm_probe_algs(void);
1055extern int xfrm_count_auth_supported(void);
1056extern int xfrm_count_enc_supported(void);
1057extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1058extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1059extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1060extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1061extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1062extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1063extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1064extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1065
Herbert Xu07d4ee52006-08-20 14:24:50 +10001066struct hash_desc;
Herbert Xu9409f382006-08-06 19:49:12 +10001067struct scatterlist;
Herbert Xu07d4ee52006-08-20 14:24:50 +10001068typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1069 unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070
Herbert Xu07d4ee52006-08-20 14:24:50 +10001071extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1072 int offset, int len, icv_update_fn_t icv_update);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073
1074static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1075 int family)
1076{
1077 switch (family) {
1078 default:
1079 case AF_INET:
Al Viro8c689a62006-11-08 00:20:21 -08001080 return (__force __u32)a->a4 - (__force __u32)b->a4;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 case AF_INET6:
1082 return ipv6_addr_cmp((struct in6_addr *)a,
1083 (struct in6_addr *)b);
1084 }
1085}
1086
Herbert Xu77d8d7a2005-10-05 12:15:12 -07001087static inline int xfrm_policy_id2dir(u32 index)
1088{
1089 return index & 7;
1090}
1091
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001092static inline int xfrm_aevent_is_on(void)
1093{
Patrick McHardybe336902006-03-20 22:40:54 -08001094 struct sock *nlsk;
1095 int ret = 0;
1096
1097 rcu_read_lock();
1098 nlsk = rcu_dereference(xfrm_nl);
1099 if (nlsk)
1100 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1101 rcu_read_unlock();
1102 return ret;
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001103}
1104
1105static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1106{
1107 if (xfrm_aevent_is_on())
1108 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1109}
1110
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001111#ifdef CONFIG_XFRM_MIGRATE
1112static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1113{
1114 return (struct xfrm_algo *)kmemdup(orig, sizeof(*orig) + orig->alg_key_len, GFP_KERNEL);
1115}
1116
1117static inline void xfrm_states_put(struct xfrm_state **states, int n)
1118{
1119 int i;
1120 for (i = 0; i < n; i++)
1121 xfrm_state_put(*(states + i));
1122}
1123
1124static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1125{
1126 int i;
1127 for (i = 0; i < n; i++)
1128 xfrm_state_delete(*(states + i));
1129}
1130#endif
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001131
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132#endif /* _NET_XFRM_H */