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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005#include <linux/xfrm.h>
6#include <linux/spinlock.h>
7#include <linux/list.h>
8#include <linux/skbuff.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -02009#include <linux/socket.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/pfkeyv2.h>
Masahide NAKAMURA57947082006-09-22 15:06:24 -070011#include <linux/ipsec.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/in6.h>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080013#include <linux/mutex.h>
Joy Lattenab5f5e82007-09-17 11:51:22 -070014#include <linux/audit.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
16#include <net/sock.h>
17#include <net/dst.h>
Herbert Xu436a0a42007-10-08 17:25:53 -070018#include <net/ip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <net/route.h>
20#include <net/ipv6.h>
21#include <net/ip6_fib.h>
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -080022#ifdef CONFIG_XFRM_STATISTICS
23#include <net/snmp.h>
24#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
Masahide NAKAMURAd3d6dd32007-06-26 23:57:49 -070026#define XFRM_PROTO_ESP 50
27#define XFRM_PROTO_AH 51
28#define XFRM_PROTO_COMP 108
29#define XFRM_PROTO_IPIP 4
30#define XFRM_PROTO_IPV6 41
31#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
32#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
33
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
Herbert Xub59f45d2006-05-27 23:05:54 -070035#define MODULE_ALIAS_XFRM_MODE(family, encap) \
36 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
Masahide NAKAMURAd3d6dd32007-06-26 23:57:49 -070037#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
38 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -080040#ifdef CONFIG_XFRM_STATISTICS
41DECLARE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics);
42#define XFRM_INC_STATS(field) SNMP_INC_STATS(xfrm_statistics, field)
43#define XFRM_INC_STATS_BH(field) SNMP_INC_STATS_BH(xfrm_statistics, field)
44#define XFRM_INC_STATS_USER(field) SNMP_INC_STATS_USER(xfrm_statistics, field)
45#else
46#define XFRM_INC_STATS(field)
47#define XFRM_INC_STATS_BH(field)
48#define XFRM_INC_STATS_USER(field)
49#endif
50
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -080051extern struct sock *xfrm_nl;
52extern u32 sysctl_xfrm_aevent_etime;
53extern u32 sysctl_xfrm_aevent_rseqth;
Pavel Emelyanova37ae402007-10-23 21:13:53 -070054extern int sysctl_xfrm_larval_drop;
55extern u32 sysctl_xfrm_acq_expires;
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -080056
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080057extern struct mutex xfrm_cfg_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59/* Organization of SPD aka "XFRM rules"
60 ------------------------------------
61
62 Basic objects:
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
67
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
72
73 Lookup is plain linear search until the first match with selector.
74
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
81
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
85 |---. child .-> NULL
86
87 Bundles are cached at xrfm_policy struct (field ->bundles).
88
89
90 Resolution of xrfm_tmpl
91 -----------------------
92 Template contains:
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
103 flow id?
104
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
108
109 PROBLEMS:
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
118 */
119
120/* Full description of state of transformer. */
121struct xfrm_state
122{
123 /* Note: bydst is re-used during gc */
Timo Teras4c563f72008-02-28 21:31:08 -0800124 struct list_head all;
David S. Miller8f126e32006-08-24 02:45:07 -0700125 struct hlist_node bydst;
126 struct hlist_node bysrc;
127 struct hlist_node byspi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
129 atomic_t refcnt;
130 spinlock_t lock;
131
132 struct xfrm_id id;
133 struct xfrm_selector sel;
134
David S. Miller9d4a7062006-08-24 03:18:09 -0700135 u32 genid;
136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 /* Key manger bits */
138 struct {
139 u8 state;
140 u8 dying;
141 u32 seq;
142 } km;
143
144 /* Parameters of this state. */
145 struct {
146 u32 reqid;
147 u8 mode;
148 u8 replay_window;
149 u8 aalgo, ealgo, calgo;
150 u8 flags;
151 u16 family;
152 xfrm_address_t saddr;
153 int header_len;
154 int trailer_len;
155 } props;
156
157 struct xfrm_lifetime_cfg lft;
158
159 /* Data for transformer */
160 struct xfrm_algo *aalg;
161 struct xfrm_algo *ealg;
162 struct xfrm_algo *calg;
Herbert Xu1a6509d2008-01-28 19:37:29 -0800163 struct xfrm_algo_aead *aead;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
165 /* Data for encapsulator */
166 struct xfrm_encap_tmpl *encap;
167
Noriaki TAKAMIYA060f02a2006-08-23 18:18:55 -0700168 /* Data for care-of address */
169 xfrm_address_t *coaddr;
170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
172 struct xfrm_state *tunnel;
173
174 /* If a tunnel, number of users + 1 */
175 atomic_t tunnel_users;
176
177 /* State for replay detection */
178 struct xfrm_replay_state replay;
179
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800180 /* Replay detection state at the time we sent the last notification */
181 struct xfrm_replay_state preplay;
182
Jamal Hadi Salim27170962006-04-14 15:03:05 -0700183 /* internal flag that only holds state for delayed aevent at the
184 * moment
185 */
186 u32 xflags;
187
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800188 /* Replay detection notification settings */
189 u32 replay_maxage;
190 u32 replay_maxdiff;
191
192 /* Replay detection notification timer */
193 struct timer_list rtimer;
194
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 /* Statistics */
196 struct xfrm_stats stats;
197
198 struct xfrm_lifetime_cur curlft;
199 struct timer_list timer;
200
Masahide NAKAMURA9afaca02006-08-23 18:20:16 -0700201 /* Last used time */
Herbert Xud26f3982007-11-13 21:47:08 -0800202 unsigned long lastused;
Masahide NAKAMURA9afaca02006-08-23 18:20:16 -0700203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 /* Reference to data common to all the instances of this
205 * transformer. */
Eric Dumazet533cb5b2008-01-30 19:11:50 -0800206 const struct xfrm_type *type;
Herbert Xu13996372007-10-17 21:35:51 -0700207 struct xfrm_mode *inner_mode;
208 struct xfrm_mode *outer_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
Trent Jaegerdf718372005-12-13 23:12:27 -0800210 /* Security context */
211 struct xfrm_sec_ctx *security;
212
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 /* Private data of this transformer, format is opaque,
214 * interpreted by xfrm_type methods. */
215 void *data;
216};
217
Jamal Hadi Salim27170962006-04-14 15:03:05 -0700218/* xflags - make enum if more show up */
219#define XFRM_TIME_DEFER 1
220
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221enum {
222 XFRM_STATE_VOID,
223 XFRM_STATE_ACQ,
224 XFRM_STATE_VALID,
225 XFRM_STATE_ERROR,
226 XFRM_STATE_EXPIRED,
227 XFRM_STATE_DEAD
228};
229
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700230/* callback structure passed from either netlink or pfkey */
231struct km_event
232{
Herbert Xubf088672005-06-18 22:44:00 -0700233 union {
234 u32 hard;
235 u32 proto;
236 u32 byid;
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800237 u32 aevent;
Masahide NAKAMURAf7b69832006-08-23 22:49:28 -0700238 u32 type;
Herbert Xubf088672005-06-18 22:44:00 -0700239 } data;
240
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700241 u32 seq;
242 u32 pid;
243 u32 event;
244};
245
Herbert Xu25ee3282007-12-11 09:32:34 -0800246struct net_device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247struct xfrm_type;
248struct xfrm_dst;
249struct xfrm_policy_afinfo {
250 unsigned short family;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 struct dst_ops *dst_ops;
252 void (*garbage_collect)(void);
Herbert Xu66cdb3c2007-11-13 21:37:28 -0800253 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr,
254 xfrm_address_t *daddr);
Patrick McHardya1e59ab2006-09-19 12:57:34 -0700255 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 void (*decode_session)(struct sk_buff *skb,
Herbert Xud5422ef2007-12-12 10:44:16 -0800258 struct flowi *fl,
259 int reverse);
Herbert Xu25ee3282007-12-11 09:32:34 -0800260 int (*get_tos)(struct flowi *fl);
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -0800261 int (*init_path)(struct xfrm_dst *path,
262 struct dst_entry *dst,
263 int nfheader_len);
Herbert Xu25ee3282007-12-11 09:32:34 -0800264 int (*fill_dst)(struct xfrm_dst *xdst,
265 struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266};
267
268extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
269extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700270extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
271extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
273struct xfrm_tmpl;
Jamal Hadi Salim980ebd22006-03-20 19:16:40 -0800274extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
Jamal Hadi Salim53bc6b42006-03-20 19:17:03 -0800275extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
276extern int __xfrm_state_delete(struct xfrm_state *x);
277
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278struct xfrm_state_afinfo {
Herbert Xu17c2a422007-10-17 21:33:12 -0700279 unsigned int family;
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800280 unsigned int proto;
Herbert Xu227620e2007-11-13 21:41:28 -0800281 unsigned int eth_proto;
Herbert Xu17c2a422007-10-17 21:33:12 -0700282 struct module *owner;
Eric Dumazet533cb5b2008-01-30 19:11:50 -0800283 const struct xfrm_type *type_map[IPPROTO_MAX];
Herbert Xuaa5d62c2007-10-17 21:31:12 -0700284 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
Herbert Xud094cd82005-06-20 13:19:41 -0700285 int (*init_flags)(struct xfrm_state *x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
287 struct xfrm_tmpl *tmpl,
288 xfrm_address_t *daddr, xfrm_address_t *saddr);
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -0700289 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
290 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
Miika Komucdca7262007-02-06 14:24:56 -0800291 int (*output)(struct sk_buff *skb);
Herbert Xu227620e2007-11-13 21:41:28 -0800292 int (*extract_input)(struct xfrm_state *x,
293 struct sk_buff *skb);
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800294 int (*extract_output)(struct xfrm_state *x,
295 struct sk_buff *skb);
Herbert Xu716062f2007-11-13 21:44:23 -0800296 int (*transport_finish)(struct sk_buff *skb,
297 int async);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298};
299
300extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
301extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
302
303extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
304
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305struct xfrm_type
306{
307 char *description;
308 struct module *owner;
309 __u8 proto;
Masahide NAKAMURA1b5c2292006-08-23 18:11:50 -0700310 __u8 flags;
311#define XFRM_TYPE_NON_FRAGMENT 1
Herbert Xu436a0a42007-10-08 17:25:53 -0700312#define XFRM_TYPE_REPLAY_PROT 2
Herbert Xuf04e7e82007-11-13 21:36:51 -0800313#define XFRM_TYPE_LOCAL_COADDR 4
314#define XFRM_TYPE_REMOTE_COADDR 8
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
Herbert Xu72cb6962005-06-20 13:18:08 -0700316 int (*init_state)(struct xfrm_state *x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 void (*destructor)(struct xfrm_state *);
Herbert Xue6956332006-04-01 00:52:46 -0800318 int (*input)(struct xfrm_state *, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -0700320 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
Masahide NAKAMURAaee5adb2006-08-23 17:57:28 -0700321 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 /* Estimate maximal size of result of transformation of a dgram */
Patrick McHardyc5c25232007-04-09 11:47:18 -0700323 u32 (*get_mtu)(struct xfrm_state *, int size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324};
325
Eric Dumazet533cb5b2008-01-30 19:11:50 -0800326extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
327extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
Herbert Xub59f45d2006-05-27 23:05:54 -0700329struct xfrm_mode {
Herbert Xu227620e2007-11-13 21:41:28 -0800330 /*
331 * Remove encapsulation header.
332 *
333 * The IP header will be moved over the top of the encapsulation
334 * header.
335 *
336 * On entry, the transport header shall point to where the IP header
337 * should be and the network header shall be set to where the IP
338 * header currently is. skb->data shall point to the start of the
339 * payload.
340 */
341 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
342
343 /*
344 * This is the actual input entry point.
345 *
346 * For transport mode and equivalent this would be identical to
347 * input2 (which does not need to be set). While tunnel mode
348 * and equivalent would set this to the tunnel encapsulation function
349 * xfrm4_prepare_input that would in turn call input2.
350 */
Herbert Xub59f45d2006-05-27 23:05:54 -0700351 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu37fedd32007-10-10 15:44:44 -0700352
353 /*
354 * Add encapsulation header.
355 *
356 * On exit, the transport header will be set to the start of the
357 * encapsulation header to be filled in by x->type->output and
358 * the mac header will be set to the nextheader (protocol for
359 * IPv4) field of the extension header directly preceding the
360 * encapsulation header, or in its absence, that of the top IP
361 * header. The value of the network header will always point
362 * to the top IP header while skb->data will point to the payload.
363 */
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800364 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
365
366 /*
367 * This is the actual output entry point.
368 *
369 * For transport mode and equivalent this would be identical to
370 * output2 (which does not need to be set). While tunnel mode
371 * and equivalent would set this to a tunnel encapsulation function
372 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
373 * call output2.
374 */
375 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xub59f45d2006-05-27 23:05:54 -0700376
Herbert Xu17c2a422007-10-17 21:33:12 -0700377 struct xfrm_state_afinfo *afinfo;
Herbert Xub59f45d2006-05-27 23:05:54 -0700378 struct module *owner;
379 unsigned int encap;
Herbert Xu1bfcb102007-10-17 21:31:50 -0700380 int flags;
381};
382
383/* Flags for xfrm_mode. */
384enum {
385 XFRM_MODE_FLAG_TUNNEL = 1,
Herbert Xub59f45d2006-05-27 23:05:54 -0700386};
387
388extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
389extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
Herbert Xub59f45d2006-05-27 23:05:54 -0700390
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391struct xfrm_tmpl
392{
393/* id in template is interpreted as:
394 * daddr - destination of tunnel, may be zero for transport mode.
395 * spi - zero to acquire spi. Not zero if spi is static, then
396 * daddr must be fixed too.
397 * proto - AH/ESP/IPCOMP
398 */
399 struct xfrm_id id;
400
401/* Source address of tunnel. Ignored, if it is not a tunnel. */
402 xfrm_address_t saddr;
403
Miika Komu76b3f052006-11-30 16:40:43 -0800404 unsigned short encap_family;
405
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 __u32 reqid;
407
Masahide NAKAMURA7e49e6d2006-09-22 15:05:15 -0700408/* Mode: transport, tunnel etc. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 __u8 mode;
410
411/* Sharing mode: unique, this session only, this user only etc. */
412 __u8 share;
413
414/* May skip this transfomration if no SA is found */
415 __u8 optional;
416
417/* Bit mask of algos allowed for acquisition */
418 __u32 aalgos;
419 __u32 ealgos;
420 __u32 calgos;
421};
422
Masahide NAKAMURA622dc822006-08-23 17:52:01 -0700423#define XFRM_MAX_DEPTH 6
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
425struct xfrm_policy
426{
427 struct xfrm_policy *next;
Timo Teras4c563f72008-02-28 21:31:08 -0800428 struct list_head bytype;
David S. Miller2518c7c2006-08-24 04:45:07 -0700429 struct hlist_node bydst;
430 struct hlist_node byidx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
432 /* This lock only affects elements except for entry. */
433 rwlock_t lock;
434 atomic_t refcnt;
435 struct timer_list timer;
436
437 u32 priority;
438 u32 index;
439 struct xfrm_selector selector;
440 struct xfrm_lifetime_cfg lft;
441 struct xfrm_lifetime_cur curlft;
442 struct dst_entry *bundles;
Arnaldo Carvalho de Melo46ca5f52006-11-27 17:58:59 -0200443 u16 family;
444 u8 type;
445 u8 action;
446 u8 flags;
447 u8 dead;
448 u8 xfrm_nr;
449 /* XXX 1 byte hole, try to pack */
Trent Jaegerdf718372005-12-13 23:12:27 -0800450 struct xfrm_sec_ctx *security;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
452};
453
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -0800454struct xfrm_migrate {
455 xfrm_address_t old_daddr;
456 xfrm_address_t old_saddr;
457 xfrm_address_t new_daddr;
458 xfrm_address_t new_saddr;
459 u8 proto;
460 u8 mode;
461 u16 reserved;
462 u32 reqid;
463 u16 old_family;
464 u16 new_family;
465};
466
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800467#define XFRM_KM_TIMEOUT 30
468/* which seqno */
469#define XFRM_REPLAY_SEQ 1
470#define XFRM_REPLAY_OSEQ 2
471#define XFRM_REPLAY_SEQ_MASK 3
472/* what happened */
473#define XFRM_REPLAY_UPDATE XFRM_AE_CR
474#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
475
476/* default aevent timeout in units of 100ms */
477#define XFRM_AE_ETIME 10
478/* Async Event timer multiplier */
479#define XFRM_AE_ETH_M 10
480/* default seq threshold size */
481#define XFRM_AE_SEQT_SIZE 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
483struct xfrm_mgr
484{
485 struct list_head list;
486 char *id;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700487 int (*notify)(struct xfrm_state *x, struct km_event *c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
Venkat Yekkiralacb969f02006-07-24 23:32:20 -0700489 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
Al Viro5d36b182006-11-08 00:24:06 -0800490 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700491 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
Masahide NAKAMURA97a64b42006-08-23 20:44:06 -0700492 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -0800493 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494};
495
496extern int xfrm_register_km(struct xfrm_mgr *km);
497extern int xfrm_unregister_km(struct xfrm_mgr *km);
498
David S. Miller2518c7c2006-08-24 04:45:07 -0700499extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500
Herbert Xu436a0a42007-10-08 17:25:53 -0700501/*
502 * This structure is used for the duration where packets are being
503 * transformed by IPsec. As soon as the packet leaves IPsec the
504 * area beyond the generic IP part may be overwritten.
505 */
506struct xfrm_skb_cb {
507 union {
508 struct inet_skb_parm h4;
509 struct inet6_skb_parm h6;
510 } header;
511
512 /* Sequence number for replay protection. */
Herbert Xub318e0e2008-02-12 22:50:35 -0800513 union {
514 u64 output;
515 __be32 input;
516 } seq;
Herbert Xu436a0a42007-10-08 17:25:53 -0700517};
518
519#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
520
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800521/*
522 * This structure is used by the afinfo prepare_input/prepare_output functions
523 * to transmit header information to the mode input/output functions.
524 */
525struct xfrm_mode_skb_cb {
526 union {
527 struct inet_skb_parm h4;
528 struct inet6_skb_parm h6;
529 } header;
530
531 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
532 __be16 id;
533 __be16 frag_off;
534
535 /* TOS for IPv4, class for IPv6. */
536 u8 tos;
537
538 /* TTL for IPv4, hop limitfor IPv6. */
539 u8 ttl;
540
541 /* Protocol for IPv4, NH for IPv6. */
542 u8 protocol;
543
544 /* Used by IPv6 only, zero for IPv4. */
545 u8 flow_lbl[3];
546};
547
548#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
549
Herbert Xu716062f2007-11-13 21:44:23 -0800550/*
551 * This structure is used by the input processing to locate the SPI and
552 * related information.
553 */
554struct xfrm_spi_skb_cb {
555 union {
556 struct inet_skb_parm h4;
557 struct inet6_skb_parm h6;
558 } header;
559
Herbert Xu716062f2007-11-13 21:44:23 -0800560 unsigned int daddroff;
Herbert Xu2fcb45b2007-12-03 22:54:12 -0800561 unsigned int family;
Herbert Xu716062f2007-11-13 21:44:23 -0800562};
563
564#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
565
Joy Latten161a09e2006-11-27 13:11:54 -0600566/* Audit Information */
567struct xfrm_audit
568{
Joy Lattenab5f5e82007-09-17 11:51:22 -0700569 u32 loginuid;
Joy Latten161a09e2006-11-27 13:11:54 -0600570 u32 secid;
571};
Joy Lattenc9204d92006-11-30 15:50:43 -0600572
573#ifdef CONFIG_AUDITSYSCALL
Paul Mooreafeb14b2007-12-21 14:58:11 -0800574static inline struct audit_buffer *xfrm_audit_start(const char *op)
Joy Lattenab5f5e82007-09-17 11:51:22 -0700575{
576 struct audit_buffer *audit_buf = NULL;
Paul Mooreafeb14b2007-12-21 14:58:11 -0800577
578 if (audit_enabled == 0)
579 return NULL;
580 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
581 AUDIT_MAC_IPSEC_EVENT);
582 if (audit_buf == NULL)
583 return NULL;
584 audit_log_format(audit_buf, "op=%s", op);
585 return audit_buf;
586}
587
588static inline void xfrm_audit_helper_usrinfo(u32 auid, u32 secid,
589 struct audit_buffer *audit_buf)
590{
Joy Lattenab5f5e82007-09-17 11:51:22 -0700591 char *secctx;
592 u32 secctx_len;
593
Paul Mooreafeb14b2007-12-21 14:58:11 -0800594 audit_log_format(audit_buf, " auid=%u", auid);
Paul Moore68277ac2007-12-20 20:49:33 -0800595 if (secid != 0 &&
596 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
Joy Lattenab5f5e82007-09-17 11:51:22 -0700597 audit_log_format(audit_buf, " subj=%s", secctx);
598 security_release_secctx(secctx, secctx_len);
599 } else
600 audit_log_task_context(audit_buf);
Joy Lattenab5f5e82007-09-17 11:51:22 -0700601}
602
603extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
Paul Moore68277ac2007-12-20 20:49:33 -0800604 u32 auid, u32 secid);
Joy Lattenab5f5e82007-09-17 11:51:22 -0700605extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
Paul Moore68277ac2007-12-20 20:49:33 -0800606 u32 auid, u32 secid);
Joy Lattenab5f5e82007-09-17 11:51:22 -0700607extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
Paul Moore68277ac2007-12-20 20:49:33 -0800608 u32 auid, u32 secid);
Joy Lattenab5f5e82007-09-17 11:51:22 -0700609extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
Paul Moore68277ac2007-12-20 20:49:33 -0800610 u32 auid, u32 secid);
Paul Mooreafeb14b2007-12-21 14:58:11 -0800611extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
612 struct sk_buff *skb);
613extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
614extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
615 __be32 net_spi, __be32 net_seq);
616extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
617 struct sk_buff *skb, u8 proto);
Joy Lattenc9204d92006-11-30 15:50:43 -0600618#else
Joy Lattenab5f5e82007-09-17 11:51:22 -0700619#define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0)
620#define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0)
621#define xfrm_audit_state_add(x, r, a, s) do { ; } while (0)
622#define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0)
Paul Mooreafeb14b2007-12-21 14:58:11 -0800623#define xfrm_audit_state_replay_overflow(x, s) do { ; } while (0)
624#define xfrm_audit_state_notfound_simple(s, f) do { ; } while (0)
625#define xfrm_audit_state_notfound(s, f, sp, sq) do { ; } while (0)
626#define xfrm_audit_state_icvfail(x, s, p) do { ; } while (0)
Joy Lattenc9204d92006-11-30 15:50:43 -0600627#endif /* CONFIG_AUDITSYSCALL */
Joy Latten161a09e2006-11-27 13:11:54 -0600628
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629static inline void xfrm_pol_hold(struct xfrm_policy *policy)
630{
631 if (likely(policy != NULL))
632 atomic_inc(&policy->refcnt);
633}
634
WANG Cong64c31b32008-01-07 22:34:29 -0800635extern void xfrm_policy_destroy(struct xfrm_policy *policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636
637static inline void xfrm_pol_put(struct xfrm_policy *policy)
638{
639 if (atomic_dec_and_test(&policy->refcnt))
WANG Cong64c31b32008-01-07 22:34:29 -0800640 xfrm_policy_destroy(policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641}
642
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700643#ifdef CONFIG_XFRM_SUB_POLICY
644static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
645{
646 int i;
647 for (i = npols - 1; i >= 0; --i)
648 xfrm_pol_put(pols[i]);
649}
650#else
651static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
652{
653 xfrm_pol_put(pols[0]);
654}
655#endif
656
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657extern void __xfrm_state_destroy(struct xfrm_state *);
658
Herbert Xu21380b82006-02-22 14:47:13 -0800659static inline void __xfrm_state_put(struct xfrm_state *x)
660{
661 atomic_dec(&x->refcnt);
662}
663
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664static inline void xfrm_state_put(struct xfrm_state *x)
665{
666 if (atomic_dec_and_test(&x->refcnt))
667 __xfrm_state_destroy(x);
668}
669
670static inline void xfrm_state_hold(struct xfrm_state *x)
671{
672 atomic_inc(&x->refcnt);
673}
674
675static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
676{
Al Viro5f193432006-09-27 18:46:32 -0700677 __be32 *a1 = token1;
678 __be32 *a2 = token2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 int pdw;
680 int pbi;
681
682 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
683 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
684
685 if (pdw)
686 if (memcmp(a1, a2, pdw << 2))
687 return 0;
688
689 if (pbi) {
Al Viro5f193432006-09-27 18:46:32 -0700690 __be32 mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
692 mask = htonl((0xffffffff) << (32 - pbi));
693
694 if ((a1[pdw] ^ a2[pdw]) & mask)
695 return 0;
696 }
697
698 return 1;
699}
700
701static __inline__
Al Virof9d07e41f82006-09-27 18:45:50 -0700702__be16 xfrm_flowi_sport(struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703{
Al Virof9d07e41f82006-09-27 18:45:50 -0700704 __be16 port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 switch(fl->proto) {
706 case IPPROTO_TCP:
707 case IPPROTO_UDP:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800708 case IPPROTO_UDPLITE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 case IPPROTO_SCTP:
710 port = fl->fl_ip_sport;
711 break;
712 case IPPROTO_ICMP:
713 case IPPROTO_ICMPV6:
714 port = htons(fl->fl_icmp_type);
715 break;
Masahide NAKAMURA2ce42722006-08-23 20:39:03 -0700716 case IPPROTO_MH:
717 port = htons(fl->fl_mh_type);
718 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 default:
720 port = 0; /*XXX*/
721 }
722 return port;
723}
724
725static __inline__
Al Virof9d07e41f82006-09-27 18:45:50 -0700726__be16 xfrm_flowi_dport(struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727{
Al Virof9d07e41f82006-09-27 18:45:50 -0700728 __be16 port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 switch(fl->proto) {
730 case IPPROTO_TCP:
731 case IPPROTO_UDP:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800732 case IPPROTO_UDPLITE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 case IPPROTO_SCTP:
734 port = fl->fl_ip_dport;
735 break;
736 case IPPROTO_ICMP:
737 case IPPROTO_ICMPV6:
738 port = htons(fl->fl_icmp_code);
739 break;
740 default:
741 port = 0; /*XXX*/
742 }
743 return port;
744}
745
Andrew Morton77681022006-11-08 22:46:26 -0800746extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
747 unsigned short family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748
Trent Jaegerdf718372005-12-13 23:12:27 -0800749#ifdef CONFIG_SECURITY_NETWORK_XFRM
750/* If neither has a context --> match
751 * Otherwise, both must have a context and the sids, doi, alg must match
752 */
753static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
754{
755 return ((!s1 && !s2) ||
756 (s1 && s2 &&
757 (s1->ctx_sid == s2->ctx_sid) &&
758 (s1->ctx_doi == s2->ctx_doi) &&
759 (s1->ctx_alg == s2->ctx_alg)));
760}
761#else
762static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
763{
764 return 1;
765}
766#endif
767
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768/* A struct encoding bundle of transformations to apply to some set of flow.
769 *
770 * dst->child points to the next element of bundle.
771 * dst->xfrm points to an instanse of transformer.
772 *
773 * Due to unfortunate limitations of current routing cache, which we
774 * have no time to fix, it mirrors struct rtable and bound to the same
775 * routing key, including saddr,daddr. However, we can have many of
776 * bundles differing by session id. All the bundles grow from a parent
777 * policy rule.
778 */
779struct xfrm_dst
780{
781 union {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 struct dst_entry dst;
783 struct rtable rt;
784 struct rt6_info rt6;
785 } u;
786 struct dst_entry *route;
Masahide NAKAMURA157bfc22007-04-30 00:33:35 -0700787#ifdef CONFIG_XFRM_SUB_POLICY
788 struct flowi *origin;
789 struct xfrm_selector *partner;
790#endif
David S. Miller9d4a7062006-08-24 03:18:09 -0700791 u32 genid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 u32 route_mtu_cached;
793 u32 child_mtu_cached;
Hideaki YOSHIFUJI92d63de2005-05-26 12:58:04 -0700794 u32 route_cookie;
795 u32 path_cookie;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796};
797
Herbert Xuaabc9762005-05-03 16:27:10 -0700798static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
799{
800 dst_release(xdst->route);
801 if (likely(xdst->u.dst.xfrm))
802 xfrm_state_put(xdst->u.dst.xfrm);
Masahide NAKAMURA157bfc22007-04-30 00:33:35 -0700803#ifdef CONFIG_XFRM_SUB_POLICY
804 kfree(xdst->origin);
805 xdst->origin = NULL;
806 kfree(xdst->partner);
807 xdst->partner = NULL;
808#endif
Herbert Xuaabc9762005-05-03 16:27:10 -0700809}
810
811extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
812
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813struct sec_path
814{
815 atomic_t refcnt;
816 int len;
Herbert Xudbe5b4a2006-04-01 00:54:16 -0800817 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818};
819
820static inline struct sec_path *
821secpath_get(struct sec_path *sp)
822{
823 if (sp)
824 atomic_inc(&sp->refcnt);
825 return sp;
826}
827
828extern void __secpath_destroy(struct sec_path *sp);
829
830static inline void
831secpath_put(struct sec_path *sp)
832{
833 if (sp && atomic_dec_and_test(&sp->refcnt))
834 __secpath_destroy(sp);
835}
836
837extern struct sec_path *secpath_dup(struct sec_path *src);
838
839static inline void
840secpath_reset(struct sk_buff *skb)
841{
842#ifdef CONFIG_XFRM
843 secpath_put(skb->sp);
844 skb->sp = NULL;
845#endif
846}
847
848static inline int
Patrick McHardya1e59ab2006-09-19 12:57:34 -0700849xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
850{
851 switch (family) {
852 case AF_INET:
853 return addr->a4 == 0;
854 case AF_INET6:
855 return ipv6_addr_any((struct in6_addr *)&addr->a6);
856 }
857 return 0;
858}
859
860static inline int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861__xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
862{
863 return (tmpl->saddr.a4 &&
864 tmpl->saddr.a4 != x->props.saddr.a4);
865}
866
867static inline int
868__xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
869{
870 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
871 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
872}
873
874static inline int
875xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
876{
877 switch (family) {
878 case AF_INET:
879 return __xfrm4_state_addr_cmp(tmpl, x);
880 case AF_INET6:
881 return __xfrm6_state_addr_cmp(tmpl, x);
882 }
883 return !0;
884}
885
886#ifdef CONFIG_XFRM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
888
Herbert Xud5422ef2007-12-12 10:44:16 -0800889static inline int __xfrm_policy_check2(struct sock *sk, int dir,
890 struct sk_buff *skb,
891 unsigned int family, int reverse)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892{
Herbert Xud5422ef2007-12-12 10:44:16 -0800893 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
894
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 if (sk && sk->sk_policy[XFRM_POLICY_IN])
Herbert Xud5422ef2007-12-12 10:44:16 -0800896 return __xfrm_policy_check(sk, ndir, skb, family);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700897
David S. Miller2518c7c2006-08-24 04:45:07 -0700898 return (!xfrm_policy_count[dir] && !skb->sp) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 (skb->dst->flags & DST_NOPOLICY) ||
Herbert Xud5422ef2007-12-12 10:44:16 -0800900 __xfrm_policy_check(sk, ndir, skb, family);
901}
902
903static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
904{
905 return __xfrm_policy_check2(sk, dir, skb, family, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906}
907
908static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
909{
910 return xfrm_policy_check(sk, dir, skb, AF_INET);
911}
912
913static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
914{
915 return xfrm_policy_check(sk, dir, skb, AF_INET6);
916}
917
Herbert Xud5422ef2007-12-12 10:44:16 -0800918static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
919 struct sk_buff *skb)
920{
921 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
922}
923
924static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
925 struct sk_buff *skb)
926{
927 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
928}
929
930extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
931 unsigned int family, int reverse);
932
933static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
934 unsigned int family)
935{
936 return __xfrm_decode_session(skb, fl, family, 0);
937}
938
939static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
940 struct flowi *fl,
941 unsigned int family)
942{
943 return __xfrm_decode_session(skb, fl, family, 1);
944}
945
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
947
948static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
949{
David S. Miller2518c7c2006-08-24 04:45:07 -0700950 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 (skb->dst->flags & DST_NOXFRM) ||
952 __xfrm_route_forward(skb, family);
953}
954
955static inline int xfrm4_route_forward(struct sk_buff *skb)
956{
957 return xfrm_route_forward(skb, AF_INET);
958}
959
960static inline int xfrm6_route_forward(struct sk_buff *skb)
961{
962 return xfrm_route_forward(skb, AF_INET6);
963}
964
965extern int __xfrm_sk_clone_policy(struct sock *sk);
966
967static inline int xfrm_sk_clone_policy(struct sock *sk)
968{
969 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
970 return __xfrm_sk_clone_policy(sk);
971 return 0;
972}
973
Herbert Xu4666faa2005-06-18 22:43:22 -0700974extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975
976static inline void xfrm_sk_free_policy(struct sock *sk)
977{
978 if (unlikely(sk->sk_policy[0] != NULL)) {
979 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
980 sk->sk_policy[0] = NULL;
981 }
982 if (unlikely(sk->sk_policy[1] != NULL)) {
983 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
984 sk->sk_policy[1] = NULL;
985 }
986}
987
988#else
989
990static inline void xfrm_sk_free_policy(struct sock *sk) {}
991static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
992static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
993static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
994static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
995{
996 return 1;
997}
998static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
999{
1000 return 1;
1001}
1002static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1003{
1004 return 1;
1005}
Herbert Xud5422ef2007-12-12 10:44:16 -08001006static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1007 struct flowi *fl,
1008 unsigned int family)
1009{
1010 return -ENOSYS;
1011}
1012static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1013 struct sk_buff *skb)
1014{
1015 return 1;
1016}
1017static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1018 struct sk_buff *skb)
1019{
1020 return 1;
1021}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022#endif
1023
1024static __inline__
1025xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1026{
1027 switch (family){
1028 case AF_INET:
1029 return (xfrm_address_t *)&fl->fl4_dst;
1030 case AF_INET6:
1031 return (xfrm_address_t *)&fl->fl6_dst;
1032 }
1033 return NULL;
1034}
1035
1036static __inline__
1037xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1038{
1039 switch (family){
1040 case AF_INET:
1041 return (xfrm_address_t *)&fl->fl4_src;
1042 case AF_INET6:
1043 return (xfrm_address_t *)&fl->fl6_src;
1044 }
1045 return NULL;
1046}
1047
1048static __inline__ int
1049__xfrm4_state_addr_check(struct xfrm_state *x,
1050 xfrm_address_t *daddr, xfrm_address_t *saddr)
1051{
1052 if (daddr->a4 == x->id.daddr.a4 &&
1053 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1054 return 1;
1055 return 0;
1056}
1057
1058static __inline__ int
1059__xfrm6_state_addr_check(struct xfrm_state *x,
1060 xfrm_address_t *daddr, xfrm_address_t *saddr)
1061{
1062 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1063 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1064 ipv6_addr_any((struct in6_addr *)saddr) ||
1065 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1066 return 1;
1067 return 0;
1068}
1069
1070static __inline__ int
1071xfrm_state_addr_check(struct xfrm_state *x,
1072 xfrm_address_t *daddr, xfrm_address_t *saddr,
1073 unsigned short family)
1074{
1075 switch (family) {
1076 case AF_INET:
1077 return __xfrm4_state_addr_check(x, daddr, saddr);
1078 case AF_INET6:
1079 return __xfrm6_state_addr_check(x, daddr, saddr);
1080 }
1081 return 0;
1082}
1083
Masahide NAKAMURAe53820d2006-08-23 19:12:01 -07001084static __inline__ int
1085xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1086 unsigned short family)
1087{
1088 switch (family) {
1089 case AF_INET:
1090 return __xfrm4_state_addr_check(x,
1091 (xfrm_address_t *)&fl->fl4_dst,
1092 (xfrm_address_t *)&fl->fl4_src);
1093 case AF_INET6:
1094 return __xfrm6_state_addr_check(x,
1095 (xfrm_address_t *)&fl->fl6_dst,
1096 (xfrm_address_t *)&fl->fl6_src);
1097 }
1098 return 0;
1099}
1100
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101static inline int xfrm_state_kern(struct xfrm_state *x)
1102{
1103 return atomic_read(&x->tunnel_users);
1104}
1105
Masahide NAKAMURA57947082006-09-22 15:06:24 -07001106static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1107{
Masahide NAKAMURAdc00a522006-08-23 17:49:52 -07001108 return (!userproto || proto == userproto ||
1109 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1110 proto == IPPROTO_ESP ||
1111 proto == IPPROTO_COMP)));
Masahide NAKAMURA57947082006-09-22 15:06:24 -07001112}
1113
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114/*
1115 * xfrm algorithm information
1116 */
Herbert Xu1a6509d2008-01-28 19:37:29 -08001117struct xfrm_algo_aead_info {
1118 u16 icv_truncbits;
1119};
1120
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121struct xfrm_algo_auth_info {
1122 u16 icv_truncbits;
1123 u16 icv_fullbits;
1124};
1125
1126struct xfrm_algo_encr_info {
1127 u16 blockbits;
1128 u16 defkeybits;
1129};
1130
1131struct xfrm_algo_comp_info {
1132 u16 threshold;
1133};
1134
1135struct xfrm_algo_desc {
1136 char *name;
Herbert Xu04ff1262006-08-13 08:50:00 +10001137 char *compat;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 u8 available:1;
1139 union {
Herbert Xu1a6509d2008-01-28 19:37:29 -08001140 struct xfrm_algo_aead_info aead;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 struct xfrm_algo_auth_info auth;
1142 struct xfrm_algo_encr_info encr;
1143 struct xfrm_algo_comp_info comp;
1144 } uinfo;
1145 struct sadb_alg desc;
1146};
1147
1148/* XFRM tunnel handlers. */
1149struct xfrm_tunnel {
1150 int (*handler)(struct sk_buff *skb);
Herbert Xud2acc342006-03-28 01:12:13 -08001151 int (*err_handler)(struct sk_buff *skb, __u32 info);
1152
1153 struct xfrm_tunnel *next;
1154 int priority;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155};
1156
1157struct xfrm6_tunnel {
Herbert Xud2acc342006-03-28 01:12:13 -08001158 int (*handler)(struct sk_buff *skb);
1159 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
Al Viro04ce6902006-11-08 00:21:01 -08001160 int type, int code, int offset, __be32 info);
Herbert Xud2acc342006-03-28 01:12:13 -08001161 struct xfrm6_tunnel *next;
1162 int priority;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163};
1164
Timo Teras4c563f72008-02-28 21:31:08 -08001165struct xfrm_state_walk {
1166 struct xfrm_state *state;
1167 int count;
1168 u8 proto;
1169};
1170
1171struct xfrm_policy_walk {
1172 struct xfrm_policy *policy;
1173 int count;
1174 u8 type, cur_type;
1175};
1176
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177extern void xfrm_init(void);
1178extern void xfrm4_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179extern void xfrm_state_init(void);
1180extern void xfrm4_state_init(void);
Daniel Lezcanoc35b7e72007-12-08 00:14:11 -08001181#ifdef CONFIG_XFRM
1182extern int xfrm6_init(void);
1183extern void xfrm6_fini(void);
Daniel Lezcano0013cab2007-12-07 00:42:11 -08001184extern int xfrm6_state_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185extern void xfrm6_state_fini(void);
Daniel Lezcanoc35b7e72007-12-08 00:14:11 -08001186#else
1187static inline int xfrm6_init(void)
1188{
1189 return 0;
1190}
1191static inline void xfrm6_fini(void)
1192{
1193 ;
1194}
1195#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08001197#ifdef CONFIG_XFRM_STATISTICS
1198extern int xfrm_proc_init(void);
1199#endif
1200
Timo Teras4c563f72008-02-28 21:31:08 -08001201static inline void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1202{
1203 walk->proto = proto;
1204 walk->state = NULL;
1205 walk->count = 0;
1206}
1207
1208static inline void xfrm_state_walk_done(struct xfrm_state_walk *walk)
1209{
1210 if (walk->state != NULL) {
1211 xfrm_state_put(walk->state);
1212 walk->state = NULL;
1213 }
1214}
1215
1216extern int xfrm_state_walk(struct xfrm_state_walk *walk,
1217 int (*func)(struct xfrm_state *, int, void*), void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218extern struct xfrm_state *xfrm_state_alloc(void);
1219extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1220 struct flowi *fl, struct xfrm_tmpl *tmpl,
1221 struct xfrm_policy *pol, int *err,
1222 unsigned short family);
Jamal Hadi Salim628529b2007-07-02 22:41:14 -07001223extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1224 xfrm_address_t *saddr,
1225 unsigned short family,
1226 u8 mode, u8 proto, u32 reqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227extern int xfrm_state_check_expire(struct xfrm_state *x);
1228extern void xfrm_state_insert(struct xfrm_state *x);
1229extern int xfrm_state_add(struct xfrm_state *x);
1230extern int xfrm_state_update(struct xfrm_state *x);
Al Viroa94cfd12006-09-27 18:47:24 -07001231extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
Masahide NAKAMURAeb2971b2006-08-23 17:56:04 -07001232extern 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 -07001233#ifdef CONFIG_XFRM_SUB_POLICY
1234extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1235 int n, unsigned short family);
1236extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1237 int n, unsigned short family);
1238#else
1239static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1240 int n, unsigned short family)
1241{
1242 return -ENOSYS;
1243}
1244
1245static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1246 int n, unsigned short family)
1247{
1248 return -ENOSYS;
1249}
1250#endif
Jamal Hadi Salimaf11e312007-05-04 12:55:13 -07001251
1252struct xfrmk_sadinfo {
1253 u32 sadhcnt; /* current hash bkts */
1254 u32 sadhmcnt; /* max allowed hash bkts */
1255 u32 sadcnt; /* current running count */
1256};
1257
Jamal Hadi Salim5a6d3412007-05-04 12:55:39 -07001258struct xfrmk_spdinfo {
1259 u32 incnt;
1260 u32 outcnt;
1261 u32 fwdcnt;
1262 u32 inscnt;
1263 u32 outscnt;
1264 u32 fwdscnt;
1265 u32 spdhcnt;
1266 u32 spdhmcnt;
1267};
1268
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -07001270extern int xfrm_state_delete(struct xfrm_state *x);
Joy Latten4aa2e622007-06-04 19:05:57 -04001271extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
Jamal Hadi Salimaf11e312007-05-04 12:55:13 -07001272extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
Jamal Hadi Salim5a6d3412007-05-04 12:55:39 -07001273extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
Paul Mooreafeb14b2007-12-21 14:58:11 -08001274extern int xfrm_replay_check(struct xfrm_state *x,
1275 struct sk_buff *skb, __be32 seq);
Al Viro61f46272006-09-27 18:48:33 -07001276extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001277extern void xfrm_replay_notify(struct xfrm_state *x, int event);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
Herbert Xu72cb6962005-06-20 13:18:08 -07001279extern int xfrm_init_state(struct xfrm_state *x);
Herbert Xu227620e2007-11-13 21:41:28 -08001280extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu716062f2007-11-13 21:44:23 -08001281extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1282 int encap_type);
Herbert Xu1bf06cd2007-11-19 18:50:17 -08001283extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
Herbert Xuc6581a42007-11-13 21:43:43 -08001284extern int xfrm_output_resume(struct sk_buff *skb, int err);
Herbert Xu406ef772007-10-08 17:16:30 -07001285extern int xfrm_output(struct sk_buff *skb);
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001286extern int xfrm4_extract_header(struct sk_buff *skb);
Herbert Xu227620e2007-11-13 21:41:28 -08001287extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xuc4541b42007-10-17 21:28:53 -07001288extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1289 int encap_type);
Herbert Xu716062f2007-11-13 21:44:23 -08001290extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291extern int xfrm4_rcv(struct sk_buff *skb);
Herbert Xuc4541b42007-10-17 21:28:53 -07001292
1293static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1294{
1295 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1296}
1297
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001298extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1299extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300extern int xfrm4_output(struct sk_buff *skb);
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -08001301extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1302extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001303extern int xfrm6_extract_header(struct sk_buff *skb);
Herbert Xu227620e2007-11-13 21:41:28 -08001304extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu33b5ecb2007-10-17 21:29:25 -07001305extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
Herbert Xu716062f2007-11-13 21:44:23 -08001306extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
Herbert Xue5bbef22007-10-15 12:50:28 -07001307extern int xfrm6_rcv(struct sk_buff *skb);
Masahide NAKAMURAfbd9a5b2006-08-23 18:08:21 -07001308extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1309 xfrm_address_t *saddr, u8 proto);
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -08001310extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1311extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
Al Viro8c689a62006-11-08 00:20:21 -08001312extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
Al Viro8c689a62006-11-08 00:20:21 -08001314extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001315extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1316extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317extern int xfrm6_output(struct sk_buff *skb);
Masahide NAKAMURAaee5adb2006-08-23 17:57:28 -07001318extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1319 u8 **prevhdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320
1321#ifdef CONFIG_XFRM
James Chapman067b2072007-07-05 17:08:05 -07001322extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324#else
1325static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1326{
1327 return -ENOPROTOOPT;
1328}
1329
James Chapman067b2072007-07-05 17:08:05 -07001330static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331{
1332 /* should not happen */
1333 kfree_skb(skb);
1334 return 0;
1335}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336#endif
1337
Al Virodd0fc662005-10-07 07:46:04 +01001338struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
Timo Teras4c563f72008-02-28 21:31:08 -08001339
1340static inline void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
1341{
1342 walk->cur_type = XFRM_POLICY_TYPE_MAIN;
1343 walk->type = type;
1344 walk->policy = NULL;
1345 walk->count = 0;
1346}
1347
1348static inline void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
1349{
1350 if (walk->policy != NULL) {
1351 xfrm_pol_put(walk->policy);
1352 walk->policy = NULL;
1353 }
1354}
1355
1356extern int xfrm_policy_walk(struct xfrm_policy_walk *walk,
1357 int (*func)(struct xfrm_policy *, int, int, void*), void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001359struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1360 struct xfrm_selector *sel,
Eric Parisef41aaa2007-03-07 15:37:58 -08001361 struct xfrm_sec_ctx *ctx, int delete,
1362 int *err);
1363struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
Joy Latten4aa2e622007-06-04 19:05:57 -04001364int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365u32 xfrm_get_acqseq(void);
Herbert Xu658b2192007-10-09 13:29:52 -07001366extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
Joy Latten161a09e2006-11-27 13:11:54 -06001367struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1368 xfrm_address_t *daddr, xfrm_address_t *saddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 int create, unsigned short family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
Venkat Yekkirala5b368e62006-10-05 15:42:18 -05001371extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1372 struct flowi *fl, int family, int strict);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001374#ifdef CONFIG_XFRM_MIGRATE
1375extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1376 struct xfrm_migrate *m, int num_bundles);
1377extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1378extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1379 struct xfrm_migrate *m);
1380extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1381 struct xfrm_migrate *m, int num_bundles);
1382#endif
1383
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384extern wait_queue_head_t km_waitq;
Al Viro5d36b182006-11-08 00:24:06 -08001385extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
Jamal Hadi Salim6c5c8ca2006-03-20 19:17:25 -08001386extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
Masahide NAKAMURA97a64b42006-08-23 20:44:06 -07001387extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388
1389extern void xfrm_input_init(void);
Al Viro6067b2b2006-09-27 18:47:59 -07001390extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391
1392extern void xfrm_probe_algs(void);
1393extern int xfrm_count_auth_supported(void);
1394extern int xfrm_count_enc_supported(void);
1395extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1396extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1397extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1398extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1399extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1400extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1401extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1402extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
Herbert Xu1a6509d2008-01-28 19:37:29 -08001403extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1404 int probe);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405
Herbert Xu07d4ee52006-08-20 14:24:50 +10001406struct hash_desc;
Herbert Xu9409f382006-08-06 19:49:12 +10001407struct scatterlist;
Herbert Xu07d4ee52006-08-20 14:24:50 +10001408typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1409 unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410
Herbert Xu07d4ee52006-08-20 14:24:50 +10001411extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1412 int offset, int len, icv_update_fn_t icv_update);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413
1414static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1415 int family)
1416{
1417 switch (family) {
1418 default:
1419 case AF_INET:
Al Viro8c689a62006-11-08 00:20:21 -08001420 return (__force __u32)a->a4 - (__force __u32)b->a4;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421 case AF_INET6:
1422 return ipv6_addr_cmp((struct in6_addr *)a,
1423 (struct in6_addr *)b);
1424 }
1425}
1426
Herbert Xu77d8d7a2005-10-05 12:15:12 -07001427static inline int xfrm_policy_id2dir(u32 index)
1428{
1429 return index & 7;
1430}
1431
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001432static inline int xfrm_aevent_is_on(void)
1433{
Patrick McHardybe336902006-03-20 22:40:54 -08001434 struct sock *nlsk;
1435 int ret = 0;
1436
1437 rcu_read_lock();
1438 nlsk = rcu_dereference(xfrm_nl);
1439 if (nlsk)
1440 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1441 rcu_read_unlock();
1442 return ret;
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001443}
1444
Eric Dumazet0f99be02008-01-08 23:39:06 -08001445static inline int xfrm_alg_len(struct xfrm_algo *alg)
1446{
1447 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1448}
1449
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001450#ifdef CONFIG_XFRM_MIGRATE
1451static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1452{
Eric Dumazet0f99be02008-01-08 23:39:06 -08001453 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001454}
1455
1456static inline void xfrm_states_put(struct xfrm_state **states, int n)
1457{
1458 int i;
1459 for (i = 0; i < n; i++)
1460 xfrm_state_put(*(states + i));
1461}
1462
1463static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1464{
1465 int i;
1466 for (i = 0; i < n; i++)
1467 xfrm_state_delete(*(states + i));
1468}
1469#endif
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001470
Herbert Xu00501122007-12-11 01:53:43 -08001471static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1472{
1473 return skb->sp->xvec[skb->sp->len - 1];
1474}
1475
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476#endif /* _NET_XFRM_H */