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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>
22
Masahide NAKAMURAd3d6dd32007-06-26 23:57:49 -070023#define XFRM_PROTO_ESP 50
24#define XFRM_PROTO_AH 51
25#define XFRM_PROTO_COMP 108
26#define XFRM_PROTO_IPIP 4
27#define XFRM_PROTO_IPV6 41
28#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
29#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
30
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
Herbert Xub59f45d2006-05-27 23:05:54 -070032#define MODULE_ALIAS_XFRM_MODE(family, encap) \
33 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
Masahide NAKAMURAd3d6dd32007-06-26 23:57:49 -070034#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
35 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -080037extern struct sock *xfrm_nl;
38extern u32 sysctl_xfrm_aevent_etime;
39extern u32 sysctl_xfrm_aevent_rseqth;
Pavel Emelyanova37ae402007-10-23 21:13:53 -070040extern int sysctl_xfrm_larval_drop;
41extern u32 sysctl_xfrm_acq_expires;
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -080042
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080043extern struct mutex xfrm_cfg_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
45/* Organization of SPD aka "XFRM rules"
46 ------------------------------------
47
48 Basic objects:
49 - policy rule, struct xfrm_policy (=SPD entry)
50 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
51 - instance of a transformer, struct xfrm_state (=SA)
52 - template to clone xfrm_state, struct xfrm_tmpl
53
54 SPD is plain linear list of xfrm_policy rules, ordered by priority.
55 (To be compatible with existing pfkeyv2 implementations,
56 many rules with priority of 0x7fffffff are allowed to exist and
57 such rules are ordered in an unpredictable way, thanks to bsd folks.)
58
59 Lookup is plain linear search until the first match with selector.
60
61 If "action" is "block", then we prohibit the flow, otherwise:
62 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
63 policy entry has list of up to XFRM_MAX_DEPTH transformations,
64 described by templates xfrm_tmpl. Each template is resolved
65 to a complete xfrm_state (see below) and we pack bundle of transformations
66 to a dst_entry returned to requestor.
67
68 dst -. xfrm .-> xfrm_state #1
69 |---. child .-> dst -. xfrm .-> xfrm_state #2
70 |---. child .-> dst -. xfrm .-> xfrm_state #3
71 |---. child .-> NULL
72
73 Bundles are cached at xrfm_policy struct (field ->bundles).
74
75
76 Resolution of xrfm_tmpl
77 -----------------------
78 Template contains:
79 1. ->mode Mode: transport or tunnel
80 2. ->id.proto Protocol: AH/ESP/IPCOMP
81 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
82 Q: allow to resolve security gateway?
83 4. ->id.spi If not zero, static SPI.
84 5. ->saddr Local tunnel endpoint, ignored for transport mode.
85 6. ->algos List of allowed algos. Plain bitmask now.
86 Q: ealgos, aalgos, calgos. What a mess...
87 7. ->share Sharing mode.
88 Q: how to implement private sharing mode? To add struct sock* to
89 flow id?
90
91 Having this template we search through SAD searching for entries
92 with appropriate mode/proto/algo, permitted by selector.
93 If no appropriate entry found, it is requested from key manager.
94
95 PROBLEMS:
96 Q: How to find all the bundles referring to a physical path for
97 PMTU discovery? Seems, dst should contain list of all parents...
98 and enter to infinite locking hierarchy disaster.
99 No! It is easier, we will not search for them, let them find us.
100 We add genid to each dst plus pointer to genid of raw IP route,
101 pmtu disc will update pmtu on raw IP route and increase its genid.
102 dst_check() will see this for top level and trigger resyncing
103 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
104 */
105
106/* Full description of state of transformer. */
107struct xfrm_state
108{
109 /* Note: bydst is re-used during gc */
David S. Miller8f126e32006-08-24 02:45:07 -0700110 struct hlist_node bydst;
111 struct hlist_node bysrc;
112 struct hlist_node byspi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
114 atomic_t refcnt;
115 spinlock_t lock;
116
117 struct xfrm_id id;
118 struct xfrm_selector sel;
119
David S. Miller9d4a7062006-08-24 03:18:09 -0700120 u32 genid;
121
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 /* Key manger bits */
123 struct {
124 u8 state;
125 u8 dying;
126 u32 seq;
127 } km;
128
129 /* Parameters of this state. */
130 struct {
131 u32 reqid;
132 u8 mode;
133 u8 replay_window;
134 u8 aalgo, ealgo, calgo;
135 u8 flags;
136 u16 family;
137 xfrm_address_t saddr;
138 int header_len;
139 int trailer_len;
140 } props;
141
142 struct xfrm_lifetime_cfg lft;
143
144 /* Data for transformer */
145 struct xfrm_algo *aalg;
146 struct xfrm_algo *ealg;
147 struct xfrm_algo *calg;
148
149 /* Data for encapsulator */
150 struct xfrm_encap_tmpl *encap;
151
Noriaki TAKAMIYA060f02a2006-08-23 18:18:55 -0700152 /* Data for care-of address */
153 xfrm_address_t *coaddr;
154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
156 struct xfrm_state *tunnel;
157
158 /* If a tunnel, number of users + 1 */
159 atomic_t tunnel_users;
160
161 /* State for replay detection */
162 struct xfrm_replay_state replay;
163
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800164 /* Replay detection state at the time we sent the last notification */
165 struct xfrm_replay_state preplay;
166
Jamal Hadi Salim27170962006-04-14 15:03:05 -0700167 /* internal flag that only holds state for delayed aevent at the
168 * moment
169 */
170 u32 xflags;
171
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800172 /* Replay detection notification settings */
173 u32 replay_maxage;
174 u32 replay_maxdiff;
175
176 /* Replay detection notification timer */
177 struct timer_list rtimer;
178
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 /* Statistics */
180 struct xfrm_stats stats;
181
182 struct xfrm_lifetime_cur curlft;
183 struct timer_list timer;
184
Masahide NAKAMURA9afaca02006-08-23 18:20:16 -0700185 /* Last used time */
Herbert Xud26f3982007-11-13 21:47:08 -0800186 unsigned long lastused;
Masahide NAKAMURA9afaca02006-08-23 18:20:16 -0700187
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 /* Reference to data common to all the instances of this
189 * transformer. */
190 struct xfrm_type *type;
Herbert Xu13996372007-10-17 21:35:51 -0700191 struct xfrm_mode *inner_mode;
192 struct xfrm_mode *outer_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Trent Jaegerdf718372005-12-13 23:12:27 -0800194 /* Security context */
195 struct xfrm_sec_ctx *security;
196
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 /* Private data of this transformer, format is opaque,
198 * interpreted by xfrm_type methods. */
199 void *data;
200};
201
Jamal Hadi Salim27170962006-04-14 15:03:05 -0700202/* xflags - make enum if more show up */
203#define XFRM_TIME_DEFER 1
204
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205enum {
206 XFRM_STATE_VOID,
207 XFRM_STATE_ACQ,
208 XFRM_STATE_VALID,
209 XFRM_STATE_ERROR,
210 XFRM_STATE_EXPIRED,
211 XFRM_STATE_DEAD
212};
213
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700214/* callback structure passed from either netlink or pfkey */
215struct km_event
216{
Herbert Xubf088672005-06-18 22:44:00 -0700217 union {
218 u32 hard;
219 u32 proto;
220 u32 byid;
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800221 u32 aevent;
Masahide NAKAMURAf7b69832006-08-23 22:49:28 -0700222 u32 type;
Herbert Xubf088672005-06-18 22:44:00 -0700223 } data;
224
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700225 u32 seq;
226 u32 pid;
227 u32 event;
228};
229
Herbert Xu25ee3282007-12-11 09:32:34 -0800230struct net_device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231struct xfrm_type;
232struct xfrm_dst;
233struct xfrm_policy_afinfo {
234 unsigned short family;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 struct dst_ops *dst_ops;
236 void (*garbage_collect)(void);
Herbert Xu66cdb3c2007-11-13 21:37:28 -0800237 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr,
238 xfrm_address_t *daddr);
Patrick McHardya1e59ab2006-09-19 12:57:34 -0700239 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 void (*decode_session)(struct sk_buff *skb,
242 struct flowi *fl);
Herbert Xu25ee3282007-12-11 09:32:34 -0800243 int (*get_tos)(struct flowi *fl);
244 int (*fill_dst)(struct xfrm_dst *xdst,
245 struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246};
247
248extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
249extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700250extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
251extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
253struct xfrm_tmpl;
Jamal Hadi Salim980ebd22006-03-20 19:16:40 -0800254extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
Jamal Hadi Salim53bc6b42006-03-20 19:17:03 -0800255extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
256extern int __xfrm_state_delete(struct xfrm_state *x);
257
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258struct xfrm_state_afinfo {
Herbert Xu17c2a422007-10-17 21:33:12 -0700259 unsigned int family;
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800260 unsigned int proto;
Herbert Xu227620e2007-11-13 21:41:28 -0800261 unsigned int eth_proto;
Herbert Xu17c2a422007-10-17 21:33:12 -0700262 struct module *owner;
Herbert Xuaa5d62c2007-10-17 21:31:12 -0700263 struct xfrm_type *type_map[IPPROTO_MAX];
264 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
Herbert Xud094cd82005-06-20 13:19:41 -0700265 int (*init_flags)(struct xfrm_state *x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
267 struct xfrm_tmpl *tmpl,
268 xfrm_address_t *daddr, xfrm_address_t *saddr);
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -0700269 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
270 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
Miika Komucdca7262007-02-06 14:24:56 -0800271 int (*output)(struct sk_buff *skb);
Herbert Xu227620e2007-11-13 21:41:28 -0800272 int (*extract_input)(struct xfrm_state *x,
273 struct sk_buff *skb);
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800274 int (*extract_output)(struct xfrm_state *x,
275 struct sk_buff *skb);
Herbert Xu716062f2007-11-13 21:44:23 -0800276 int (*transport_finish)(struct sk_buff *skb,
277 int async);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278};
279
280extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
281extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
282
283extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
284
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285struct xfrm_type
286{
287 char *description;
288 struct module *owner;
289 __u8 proto;
Masahide NAKAMURA1b5c2292006-08-23 18:11:50 -0700290 __u8 flags;
291#define XFRM_TYPE_NON_FRAGMENT 1
Herbert Xu436a0a42007-10-08 17:25:53 -0700292#define XFRM_TYPE_REPLAY_PROT 2
Herbert Xuf04e7e82007-11-13 21:36:51 -0800293#define XFRM_TYPE_LOCAL_COADDR 4
294#define XFRM_TYPE_REMOTE_COADDR 8
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
Herbert Xu72cb6962005-06-20 13:18:08 -0700296 int (*init_state)(struct xfrm_state *x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 void (*destructor)(struct xfrm_state *);
Herbert Xue6956332006-04-01 00:52:46 -0800298 int (*input)(struct xfrm_state *, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -0700300 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
Masahide NAKAMURAaee5adb2006-08-23 17:57:28 -0700301 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 /* Estimate maximal size of result of transformation of a dgram */
Patrick McHardyc5c25232007-04-09 11:47:18 -0700303 u32 (*get_mtu)(struct xfrm_state *, int size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304};
305
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
307extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Herbert Xub59f45d2006-05-27 23:05:54 -0700309struct xfrm_mode {
Herbert Xu227620e2007-11-13 21:41:28 -0800310 /*
311 * Remove encapsulation header.
312 *
313 * The IP header will be moved over the top of the encapsulation
314 * header.
315 *
316 * On entry, the transport header shall point to where the IP header
317 * should be and the network header shall be set to where the IP
318 * header currently is. skb->data shall point to the start of the
319 * payload.
320 */
321 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
322
323 /*
324 * This is the actual input entry point.
325 *
326 * For transport mode and equivalent this would be identical to
327 * input2 (which does not need to be set). While tunnel mode
328 * and equivalent would set this to the tunnel encapsulation function
329 * xfrm4_prepare_input that would in turn call input2.
330 */
Herbert Xub59f45d2006-05-27 23:05:54 -0700331 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu37fedd32007-10-10 15:44:44 -0700332
333 /*
334 * Add encapsulation header.
335 *
336 * On exit, the transport header will be set to the start of the
337 * encapsulation header to be filled in by x->type->output and
338 * the mac header will be set to the nextheader (protocol for
339 * IPv4) field of the extension header directly preceding the
340 * encapsulation header, or in its absence, that of the top IP
341 * header. The value of the network header will always point
342 * to the top IP header while skb->data will point to the payload.
343 */
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800344 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
345
346 /*
347 * This is the actual output entry point.
348 *
349 * For transport mode and equivalent this would be identical to
350 * output2 (which does not need to be set). While tunnel mode
351 * and equivalent would set this to a tunnel encapsulation function
352 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
353 * call output2.
354 */
355 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xub59f45d2006-05-27 23:05:54 -0700356
Herbert Xu17c2a422007-10-17 21:33:12 -0700357 struct xfrm_state_afinfo *afinfo;
Herbert Xub59f45d2006-05-27 23:05:54 -0700358 struct module *owner;
359 unsigned int encap;
Herbert Xu1bfcb102007-10-17 21:31:50 -0700360 int flags;
361};
362
363/* Flags for xfrm_mode. */
364enum {
365 XFRM_MODE_FLAG_TUNNEL = 1,
Herbert Xub59f45d2006-05-27 23:05:54 -0700366};
367
368extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
369extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
Herbert Xub59f45d2006-05-27 23:05:54 -0700370
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371struct xfrm_tmpl
372{
373/* id in template is interpreted as:
374 * daddr - destination of tunnel, may be zero for transport mode.
375 * spi - zero to acquire spi. Not zero if spi is static, then
376 * daddr must be fixed too.
377 * proto - AH/ESP/IPCOMP
378 */
379 struct xfrm_id id;
380
381/* Source address of tunnel. Ignored, if it is not a tunnel. */
382 xfrm_address_t saddr;
383
Miika Komu76b3f052006-11-30 16:40:43 -0800384 unsigned short encap_family;
385
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 __u32 reqid;
387
Masahide NAKAMURA7e49e6d2006-09-22 15:05:15 -0700388/* Mode: transport, tunnel etc. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 __u8 mode;
390
391/* Sharing mode: unique, this session only, this user only etc. */
392 __u8 share;
393
394/* May skip this transfomration if no SA is found */
395 __u8 optional;
396
397/* Bit mask of algos allowed for acquisition */
398 __u32 aalgos;
399 __u32 ealgos;
400 __u32 calgos;
401};
402
Masahide NAKAMURA622dc822006-08-23 17:52:01 -0700403#define XFRM_MAX_DEPTH 6
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
405struct xfrm_policy
406{
407 struct xfrm_policy *next;
David S. Miller2518c7c2006-08-24 04:45:07 -0700408 struct hlist_node bydst;
409 struct hlist_node byidx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
411 /* This lock only affects elements except for entry. */
412 rwlock_t lock;
413 atomic_t refcnt;
414 struct timer_list timer;
415
416 u32 priority;
417 u32 index;
418 struct xfrm_selector selector;
419 struct xfrm_lifetime_cfg lft;
420 struct xfrm_lifetime_cur curlft;
421 struct dst_entry *bundles;
Arnaldo Carvalho de Melo46ca5f52006-11-27 17:58:59 -0200422 u16 family;
423 u8 type;
424 u8 action;
425 u8 flags;
426 u8 dead;
427 u8 xfrm_nr;
428 /* XXX 1 byte hole, try to pack */
Trent Jaegerdf718372005-12-13 23:12:27 -0800429 struct xfrm_sec_ctx *security;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
431};
432
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -0800433struct xfrm_migrate {
434 xfrm_address_t old_daddr;
435 xfrm_address_t old_saddr;
436 xfrm_address_t new_daddr;
437 xfrm_address_t new_saddr;
438 u8 proto;
439 u8 mode;
440 u16 reserved;
441 u32 reqid;
442 u16 old_family;
443 u16 new_family;
444};
445
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800446#define XFRM_KM_TIMEOUT 30
447/* which seqno */
448#define XFRM_REPLAY_SEQ 1
449#define XFRM_REPLAY_OSEQ 2
450#define XFRM_REPLAY_SEQ_MASK 3
451/* what happened */
452#define XFRM_REPLAY_UPDATE XFRM_AE_CR
453#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
454
455/* default aevent timeout in units of 100ms */
456#define XFRM_AE_ETIME 10
457/* Async Event timer multiplier */
458#define XFRM_AE_ETH_M 10
459/* default seq threshold size */
460#define XFRM_AE_SEQT_SIZE 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
462struct xfrm_mgr
463{
464 struct list_head list;
465 char *id;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700466 int (*notify)(struct xfrm_state *x, struct km_event *c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
Venkat Yekkiralacb969f02006-07-24 23:32:20 -0700468 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
Al Viro5d36b182006-11-08 00:24:06 -0800469 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700470 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
Masahide NAKAMURA97a64b42006-08-23 20:44:06 -0700471 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -0800472 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473};
474
475extern int xfrm_register_km(struct xfrm_mgr *km);
476extern int xfrm_unregister_km(struct xfrm_mgr *km);
477
David S. Miller2518c7c2006-08-24 04:45:07 -0700478extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
Herbert Xu436a0a42007-10-08 17:25:53 -0700480/*
481 * This structure is used for the duration where packets are being
482 * transformed by IPsec. As soon as the packet leaves IPsec the
483 * area beyond the generic IP part may be overwritten.
484 */
485struct xfrm_skb_cb {
486 union {
487 struct inet_skb_parm h4;
488 struct inet6_skb_parm h6;
489 } header;
490
491 /* Sequence number for replay protection. */
492 u64 seq;
493};
494
495#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
496
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800497/*
498 * This structure is used by the afinfo prepare_input/prepare_output functions
499 * to transmit header information to the mode input/output functions.
500 */
501struct xfrm_mode_skb_cb {
502 union {
503 struct inet_skb_parm h4;
504 struct inet6_skb_parm h6;
505 } header;
506
507 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
508 __be16 id;
509 __be16 frag_off;
510
511 /* TOS for IPv4, class for IPv6. */
512 u8 tos;
513
514 /* TTL for IPv4, hop limitfor IPv6. */
515 u8 ttl;
516
517 /* Protocol for IPv4, NH for IPv6. */
518 u8 protocol;
519
520 /* Used by IPv6 only, zero for IPv4. */
521 u8 flow_lbl[3];
522};
523
524#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
525
Herbert Xu716062f2007-11-13 21:44:23 -0800526/*
527 * This structure is used by the input processing to locate the SPI and
528 * related information.
529 */
530struct xfrm_spi_skb_cb {
531 union {
532 struct inet_skb_parm h4;
533 struct inet6_skb_parm h6;
534 } header;
535
Herbert Xu716062f2007-11-13 21:44:23 -0800536 unsigned int daddroff;
Herbert Xu2fcb45b2007-12-03 22:54:12 -0800537 unsigned int family;
Herbert Xu716062f2007-11-13 21:44:23 -0800538};
539
540#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
541
Joy Latten161a09e2006-11-27 13:11:54 -0600542/* Audit Information */
543struct xfrm_audit
544{
Joy Lattenab5f5e82007-09-17 11:51:22 -0700545 u32 loginuid;
Joy Latten161a09e2006-11-27 13:11:54 -0600546 u32 secid;
547};
Joy Lattenc9204d92006-11-30 15:50:43 -0600548
549#ifdef CONFIG_AUDITSYSCALL
Joy Lattenab5f5e82007-09-17 11:51:22 -0700550static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid)
551{
552 struct audit_buffer *audit_buf = NULL;
553 char *secctx;
554 u32 secctx_len;
555
556 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
557 AUDIT_MAC_IPSEC_EVENT);
558 if (audit_buf == NULL)
559 return NULL;
560
561 audit_log_format(audit_buf, "auid=%u", auid);
562
563 if (sid != 0 &&
564 security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) {
565 audit_log_format(audit_buf, " subj=%s", secctx);
566 security_release_secctx(secctx, secctx_len);
567 } else
568 audit_log_task_context(audit_buf);
569 return audit_buf;
570}
571
572extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
573 u32 auid, u32 sid);
574extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
575 u32 auid, u32 sid);
576extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
577 u32 auid, u32 sid);
578extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
579 u32 auid, u32 sid);
Joy Lattenc9204d92006-11-30 15:50:43 -0600580#else
Joy Lattenab5f5e82007-09-17 11:51:22 -0700581#define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0)
582#define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0)
583#define xfrm_audit_state_add(x, r, a, s) do { ; } while (0)
584#define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0)
Joy Lattenc9204d92006-11-30 15:50:43 -0600585#endif /* CONFIG_AUDITSYSCALL */
Joy Latten161a09e2006-11-27 13:11:54 -0600586
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587static inline void xfrm_pol_hold(struct xfrm_policy *policy)
588{
589 if (likely(policy != NULL))
590 atomic_inc(&policy->refcnt);
591}
592
593extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
594
595static inline void xfrm_pol_put(struct xfrm_policy *policy)
596{
597 if (atomic_dec_and_test(&policy->refcnt))
598 __xfrm_policy_destroy(policy);
599}
600
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700601#ifdef CONFIG_XFRM_SUB_POLICY
602static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
603{
604 int i;
605 for (i = npols - 1; i >= 0; --i)
606 xfrm_pol_put(pols[i]);
607}
608#else
609static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
610{
611 xfrm_pol_put(pols[0]);
612}
613#endif
614
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615extern void __xfrm_state_destroy(struct xfrm_state *);
616
Herbert Xu21380b82006-02-22 14:47:13 -0800617static inline void __xfrm_state_put(struct xfrm_state *x)
618{
619 atomic_dec(&x->refcnt);
620}
621
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622static inline void xfrm_state_put(struct xfrm_state *x)
623{
624 if (atomic_dec_and_test(&x->refcnt))
625 __xfrm_state_destroy(x);
626}
627
628static inline void xfrm_state_hold(struct xfrm_state *x)
629{
630 atomic_inc(&x->refcnt);
631}
632
633static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
634{
Al Viro5f193432006-09-27 18:46:32 -0700635 __be32 *a1 = token1;
636 __be32 *a2 = token2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 int pdw;
638 int pbi;
639
640 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
641 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
642
643 if (pdw)
644 if (memcmp(a1, a2, pdw << 2))
645 return 0;
646
647 if (pbi) {
Al Viro5f193432006-09-27 18:46:32 -0700648 __be32 mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649
650 mask = htonl((0xffffffff) << (32 - pbi));
651
652 if ((a1[pdw] ^ a2[pdw]) & mask)
653 return 0;
654 }
655
656 return 1;
657}
658
659static __inline__
Al Virof9d07e41f82006-09-27 18:45:50 -0700660__be16 xfrm_flowi_sport(struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661{
Al Virof9d07e41f82006-09-27 18:45:50 -0700662 __be16 port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 switch(fl->proto) {
664 case IPPROTO_TCP:
665 case IPPROTO_UDP:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800666 case IPPROTO_UDPLITE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 case IPPROTO_SCTP:
668 port = fl->fl_ip_sport;
669 break;
670 case IPPROTO_ICMP:
671 case IPPROTO_ICMPV6:
672 port = htons(fl->fl_icmp_type);
673 break;
Masahide NAKAMURA2ce42722006-08-23 20:39:03 -0700674 case IPPROTO_MH:
675 port = htons(fl->fl_mh_type);
676 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 default:
678 port = 0; /*XXX*/
679 }
680 return port;
681}
682
683static __inline__
Al Virof9d07e41f82006-09-27 18:45:50 -0700684__be16 xfrm_flowi_dport(struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685{
Al Virof9d07e41f82006-09-27 18:45:50 -0700686 __be16 port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 switch(fl->proto) {
688 case IPPROTO_TCP:
689 case IPPROTO_UDP:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800690 case IPPROTO_UDPLITE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 case IPPROTO_SCTP:
692 port = fl->fl_ip_dport;
693 break;
694 case IPPROTO_ICMP:
695 case IPPROTO_ICMPV6:
696 port = htons(fl->fl_icmp_code);
697 break;
698 default:
699 port = 0; /*XXX*/
700 }
701 return port;
702}
703
Andrew Morton77681022006-11-08 22:46:26 -0800704extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
705 unsigned short family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706
Trent Jaegerdf718372005-12-13 23:12:27 -0800707#ifdef CONFIG_SECURITY_NETWORK_XFRM
708/* If neither has a context --> match
709 * Otherwise, both must have a context and the sids, doi, alg must match
710 */
711static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
712{
713 return ((!s1 && !s2) ||
714 (s1 && s2 &&
715 (s1->ctx_sid == s2->ctx_sid) &&
716 (s1->ctx_doi == s2->ctx_doi) &&
717 (s1->ctx_alg == s2->ctx_alg)));
718}
719#else
720static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
721{
722 return 1;
723}
724#endif
725
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726/* A struct encoding bundle of transformations to apply to some set of flow.
727 *
728 * dst->child points to the next element of bundle.
729 * dst->xfrm points to an instanse of transformer.
730 *
731 * Due to unfortunate limitations of current routing cache, which we
732 * have no time to fix, it mirrors struct rtable and bound to the same
733 * routing key, including saddr,daddr. However, we can have many of
734 * bundles differing by session id. All the bundles grow from a parent
735 * policy rule.
736 */
737struct xfrm_dst
738{
739 union {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 struct dst_entry dst;
741 struct rtable rt;
742 struct rt6_info rt6;
743 } u;
744 struct dst_entry *route;
Masahide NAKAMURA157bfc22007-04-30 00:33:35 -0700745#ifdef CONFIG_XFRM_SUB_POLICY
746 struct flowi *origin;
747 struct xfrm_selector *partner;
748#endif
David S. Miller9d4a7062006-08-24 03:18:09 -0700749 u32 genid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 u32 route_mtu_cached;
751 u32 child_mtu_cached;
Hideaki YOSHIFUJI92d63de2005-05-26 12:58:04 -0700752 u32 route_cookie;
753 u32 path_cookie;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754};
755
Herbert Xuaabc9762005-05-03 16:27:10 -0700756static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
757{
758 dst_release(xdst->route);
759 if (likely(xdst->u.dst.xfrm))
760 xfrm_state_put(xdst->u.dst.xfrm);
Masahide NAKAMURA157bfc22007-04-30 00:33:35 -0700761#ifdef CONFIG_XFRM_SUB_POLICY
762 kfree(xdst->origin);
763 xdst->origin = NULL;
764 kfree(xdst->partner);
765 xdst->partner = NULL;
766#endif
Herbert Xuaabc9762005-05-03 16:27:10 -0700767}
768
769extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
770
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771struct sec_path
772{
773 atomic_t refcnt;
774 int len;
Herbert Xudbe5b4a2006-04-01 00:54:16 -0800775 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776};
777
778static inline struct sec_path *
779secpath_get(struct sec_path *sp)
780{
781 if (sp)
782 atomic_inc(&sp->refcnt);
783 return sp;
784}
785
786extern void __secpath_destroy(struct sec_path *sp);
787
788static inline void
789secpath_put(struct sec_path *sp)
790{
791 if (sp && atomic_dec_and_test(&sp->refcnt))
792 __secpath_destroy(sp);
793}
794
795extern struct sec_path *secpath_dup(struct sec_path *src);
796
797static inline void
798secpath_reset(struct sk_buff *skb)
799{
800#ifdef CONFIG_XFRM
801 secpath_put(skb->sp);
802 skb->sp = NULL;
803#endif
804}
805
806static inline int
Patrick McHardya1e59ab2006-09-19 12:57:34 -0700807xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
808{
809 switch (family) {
810 case AF_INET:
811 return addr->a4 == 0;
812 case AF_INET6:
813 return ipv6_addr_any((struct in6_addr *)&addr->a6);
814 }
815 return 0;
816}
817
818static inline int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819__xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
820{
821 return (tmpl->saddr.a4 &&
822 tmpl->saddr.a4 != x->props.saddr.a4);
823}
824
825static inline int
826__xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
827{
828 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
829 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
830}
831
832static inline int
833xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
834{
835 switch (family) {
836 case AF_INET:
837 return __xfrm4_state_addr_cmp(tmpl, x);
838 case AF_INET6:
839 return __xfrm6_state_addr_cmp(tmpl, x);
840 }
841 return !0;
842}
843
844#ifdef CONFIG_XFRM
845
846extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
847
848static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
849{
850 if (sk && sk->sk_policy[XFRM_POLICY_IN])
851 return __xfrm_policy_check(sk, dir, skb, family);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700852
David S. Miller2518c7c2006-08-24 04:45:07 -0700853 return (!xfrm_policy_count[dir] && !skb->sp) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 (skb->dst->flags & DST_NOPOLICY) ||
855 __xfrm_policy_check(sk, dir, skb, family);
856}
857
858static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
859{
860 return xfrm_policy_check(sk, dir, skb, AF_INET);
861}
862
863static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
864{
865 return xfrm_policy_check(sk, dir, skb, AF_INET6);
866}
867
Patrick McHardy3e3850e2006-01-06 23:04:54 -0800868extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
870
871static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
872{
David S. Miller2518c7c2006-08-24 04:45:07 -0700873 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 (skb->dst->flags & DST_NOXFRM) ||
875 __xfrm_route_forward(skb, family);
876}
877
878static inline int xfrm4_route_forward(struct sk_buff *skb)
879{
880 return xfrm_route_forward(skb, AF_INET);
881}
882
883static inline int xfrm6_route_forward(struct sk_buff *skb)
884{
885 return xfrm_route_forward(skb, AF_INET6);
886}
887
888extern int __xfrm_sk_clone_policy(struct sock *sk);
889
890static inline int xfrm_sk_clone_policy(struct sock *sk)
891{
892 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
893 return __xfrm_sk_clone_policy(sk);
894 return 0;
895}
896
Herbert Xu4666faa2005-06-18 22:43:22 -0700897extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
899static inline void xfrm_sk_free_policy(struct sock *sk)
900{
901 if (unlikely(sk->sk_policy[0] != NULL)) {
902 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
903 sk->sk_policy[0] = NULL;
904 }
905 if (unlikely(sk->sk_policy[1] != NULL)) {
906 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
907 sk->sk_policy[1] = NULL;
908 }
909}
910
911#else
912
913static inline void xfrm_sk_free_policy(struct sock *sk) {}
914static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
915static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
916static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
917static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
918{
919 return 1;
920}
921static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
922{
923 return 1;
924}
925static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
926{
927 return 1;
928}
929#endif
930
931static __inline__
932xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
933{
934 switch (family){
935 case AF_INET:
936 return (xfrm_address_t *)&fl->fl4_dst;
937 case AF_INET6:
938 return (xfrm_address_t *)&fl->fl6_dst;
939 }
940 return NULL;
941}
942
943static __inline__
944xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
945{
946 switch (family){
947 case AF_INET:
948 return (xfrm_address_t *)&fl->fl4_src;
949 case AF_INET6:
950 return (xfrm_address_t *)&fl->fl6_src;
951 }
952 return NULL;
953}
954
955static __inline__ int
956__xfrm4_state_addr_check(struct xfrm_state *x,
957 xfrm_address_t *daddr, xfrm_address_t *saddr)
958{
959 if (daddr->a4 == x->id.daddr.a4 &&
960 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
961 return 1;
962 return 0;
963}
964
965static __inline__ int
966__xfrm6_state_addr_check(struct xfrm_state *x,
967 xfrm_address_t *daddr, xfrm_address_t *saddr)
968{
969 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
970 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
971 ipv6_addr_any((struct in6_addr *)saddr) ||
972 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
973 return 1;
974 return 0;
975}
976
977static __inline__ int
978xfrm_state_addr_check(struct xfrm_state *x,
979 xfrm_address_t *daddr, xfrm_address_t *saddr,
980 unsigned short family)
981{
982 switch (family) {
983 case AF_INET:
984 return __xfrm4_state_addr_check(x, daddr, saddr);
985 case AF_INET6:
986 return __xfrm6_state_addr_check(x, daddr, saddr);
987 }
988 return 0;
989}
990
Masahide NAKAMURAe53820d2006-08-23 19:12:01 -0700991static __inline__ int
992xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
993 unsigned short family)
994{
995 switch (family) {
996 case AF_INET:
997 return __xfrm4_state_addr_check(x,
998 (xfrm_address_t *)&fl->fl4_dst,
999 (xfrm_address_t *)&fl->fl4_src);
1000 case AF_INET6:
1001 return __xfrm6_state_addr_check(x,
1002 (xfrm_address_t *)&fl->fl6_dst,
1003 (xfrm_address_t *)&fl->fl6_src);
1004 }
1005 return 0;
1006}
1007
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008static inline int xfrm_state_kern(struct xfrm_state *x)
1009{
1010 return atomic_read(&x->tunnel_users);
1011}
1012
Masahide NAKAMURA57947082006-09-22 15:06:24 -07001013static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1014{
Masahide NAKAMURAdc00a522006-08-23 17:49:52 -07001015 return (!userproto || proto == userproto ||
1016 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1017 proto == IPPROTO_ESP ||
1018 proto == IPPROTO_COMP)));
Masahide NAKAMURA57947082006-09-22 15:06:24 -07001019}
1020
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021/*
1022 * xfrm algorithm information
1023 */
1024struct xfrm_algo_auth_info {
1025 u16 icv_truncbits;
1026 u16 icv_fullbits;
1027};
1028
1029struct xfrm_algo_encr_info {
1030 u16 blockbits;
1031 u16 defkeybits;
1032};
1033
1034struct xfrm_algo_comp_info {
1035 u16 threshold;
1036};
1037
1038struct xfrm_algo_desc {
1039 char *name;
Herbert Xu04ff1262006-08-13 08:50:00 +10001040 char *compat;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 u8 available:1;
1042 union {
1043 struct xfrm_algo_auth_info auth;
1044 struct xfrm_algo_encr_info encr;
1045 struct xfrm_algo_comp_info comp;
1046 } uinfo;
1047 struct sadb_alg desc;
1048};
1049
1050/* XFRM tunnel handlers. */
1051struct xfrm_tunnel {
1052 int (*handler)(struct sk_buff *skb);
Herbert Xud2acc342006-03-28 01:12:13 -08001053 int (*err_handler)(struct sk_buff *skb, __u32 info);
1054
1055 struct xfrm_tunnel *next;
1056 int priority;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057};
1058
1059struct xfrm6_tunnel {
Herbert Xud2acc342006-03-28 01:12:13 -08001060 int (*handler)(struct sk_buff *skb);
1061 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
Al Viro04ce6902006-11-08 00:21:01 -08001062 int type, int code, int offset, __be32 info);
Herbert Xud2acc342006-03-28 01:12:13 -08001063 struct xfrm6_tunnel *next;
1064 int priority;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065};
1066
1067extern void xfrm_init(void);
1068extern void xfrm4_init(void);
1069extern void xfrm6_init(void);
1070extern void xfrm6_fini(void);
1071extern void xfrm_state_init(void);
1072extern void xfrm4_state_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073extern void xfrm6_state_init(void);
1074extern void xfrm6_state_fini(void);
1075
1076extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
1077extern struct xfrm_state *xfrm_state_alloc(void);
1078extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1079 struct flowi *fl, struct xfrm_tmpl *tmpl,
1080 struct xfrm_policy *pol, int *err,
1081 unsigned short family);
Jamal Hadi Salim628529b2007-07-02 22:41:14 -07001082extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1083 xfrm_address_t *saddr,
1084 unsigned short family,
1085 u8 mode, u8 proto, u32 reqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086extern int xfrm_state_check_expire(struct xfrm_state *x);
1087extern void xfrm_state_insert(struct xfrm_state *x);
1088extern int xfrm_state_add(struct xfrm_state *x);
1089extern int xfrm_state_update(struct xfrm_state *x);
Al Viroa94cfd12006-09-27 18:47:24 -07001090extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
Masahide NAKAMURAeb2971b2006-08-23 17:56:04 -07001091extern 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 -07001092#ifdef CONFIG_XFRM_SUB_POLICY
1093extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1094 int n, unsigned short family);
1095extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1096 int n, unsigned short family);
1097#else
1098static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1099 int n, unsigned short family)
1100{
1101 return -ENOSYS;
1102}
1103
1104static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1105 int n, unsigned short family)
1106{
1107 return -ENOSYS;
1108}
1109#endif
Jamal Hadi Salimaf11e312007-05-04 12:55:13 -07001110
1111struct xfrmk_sadinfo {
1112 u32 sadhcnt; /* current hash bkts */
1113 u32 sadhmcnt; /* max allowed hash bkts */
1114 u32 sadcnt; /* current running count */
1115};
1116
Jamal Hadi Salim5a6d3412007-05-04 12:55:39 -07001117struct xfrmk_spdinfo {
1118 u32 incnt;
1119 u32 outcnt;
1120 u32 fwdcnt;
1121 u32 inscnt;
1122 u32 outscnt;
1123 u32 fwdscnt;
1124 u32 spdhcnt;
1125 u32 spdhmcnt;
1126};
1127
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -07001129extern int xfrm_state_delete(struct xfrm_state *x);
Joy Latten4aa2e622007-06-04 19:05:57 -04001130extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
Jamal Hadi Salimaf11e312007-05-04 12:55:13 -07001131extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
Jamal Hadi Salim5a6d3412007-05-04 12:55:39 -07001132extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
Al Viroa252cc22006-09-27 18:48:18 -07001133extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
Al Viro61f46272006-09-27 18:48:33 -07001134extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001135extern void xfrm_replay_notify(struct xfrm_state *x, int event);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
Herbert Xu72cb6962005-06-20 13:18:08 -07001137extern int xfrm_init_state(struct xfrm_state *x);
Herbert Xu227620e2007-11-13 21:41:28 -08001138extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu716062f2007-11-13 21:44:23 -08001139extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1140 int encap_type);
Herbert Xu1bf06cd2007-11-19 18:50:17 -08001141extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
Herbert Xuc6581a42007-11-13 21:43:43 -08001142extern int xfrm_output_resume(struct sk_buff *skb, int err);
Herbert Xu406ef772007-10-08 17:16:30 -07001143extern int xfrm_output(struct sk_buff *skb);
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001144extern int xfrm4_extract_header(struct sk_buff *skb);
Herbert Xu227620e2007-11-13 21:41:28 -08001145extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xuc4541b42007-10-17 21:28:53 -07001146extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1147 int encap_type);
Herbert Xu716062f2007-11-13 21:44:23 -08001148extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149extern int xfrm4_rcv(struct sk_buff *skb);
Herbert Xuc4541b42007-10-17 21:28:53 -07001150
1151static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1152{
1153 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1154}
1155
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001156extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1157extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158extern int xfrm4_output(struct sk_buff *skb);
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -08001159extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1160extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001161extern int xfrm6_extract_header(struct sk_buff *skb);
Herbert Xu227620e2007-11-13 21:41:28 -08001162extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu33b5ecb2007-10-17 21:29:25 -07001163extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
Herbert Xu716062f2007-11-13 21:44:23 -08001164extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
Herbert Xue5bbef22007-10-15 12:50:28 -07001165extern int xfrm6_rcv(struct sk_buff *skb);
Masahide NAKAMURAfbd9a5b2006-08-23 18:08:21 -07001166extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1167 xfrm_address_t *saddr, u8 proto);
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -08001168extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1169extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
Al Viro8c689a62006-11-08 00:20:21 -08001170extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
Al Viro8c689a62006-11-08 00:20:21 -08001172extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001173extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1174extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175extern int xfrm6_output(struct sk_buff *skb);
Masahide NAKAMURAaee5adb2006-08-23 17:57:28 -07001176extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1177 u8 **prevhdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178
1179#ifdef CONFIG_XFRM
James Chapman067b2072007-07-05 17:08:05 -07001180extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182#else
1183static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1184{
1185 return -ENOPROTOOPT;
1186}
1187
James Chapman067b2072007-07-05 17:08:05 -07001188static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189{
1190 /* should not happen */
1191 kfree_skb(skb);
1192 return 0;
1193}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194#endif
1195
Al Virodd0fc662005-10-07 07:46:04 +01001196struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001197extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001199struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1200 struct xfrm_selector *sel,
Eric Parisef41aaa2007-03-07 15:37:58 -08001201 struct xfrm_sec_ctx *ctx, int delete,
1202 int *err);
1203struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
Joy Latten4aa2e622007-06-04 19:05:57 -04001204int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205u32 xfrm_get_acqseq(void);
Herbert Xu658b2192007-10-09 13:29:52 -07001206extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
Joy Latten161a09e2006-11-27 13:11:54 -06001207struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1208 xfrm_address_t *daddr, xfrm_address_t *saddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 int create, unsigned short family);
Joy Latten4aa2e622007-06-04 19:05:57 -04001210extern int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
Venkat Yekkirala5b368e62006-10-05 15:42:18 -05001212extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1213 struct flowi *fl, int family, int strict);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001215#ifdef CONFIG_XFRM_MIGRATE
1216extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1217 struct xfrm_migrate *m, int num_bundles);
1218extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1219extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1220 struct xfrm_migrate *m);
1221extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1222 struct xfrm_migrate *m, int num_bundles);
1223#endif
1224
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225extern wait_queue_head_t km_waitq;
Al Viro5d36b182006-11-08 00:24:06 -08001226extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
Jamal Hadi Salim6c5c8ca2006-03-20 19:17:25 -08001227extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
Masahide NAKAMURA97a64b42006-08-23 20:44:06 -07001228extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229
1230extern void xfrm_input_init(void);
Al Viro6067b2b2006-09-27 18:47:59 -07001231extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232
1233extern void xfrm_probe_algs(void);
1234extern int xfrm_count_auth_supported(void);
1235extern int xfrm_count_enc_supported(void);
1236extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1237extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1238extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1239extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1240extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1241extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1242extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1243extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1244
Herbert Xu07d4ee52006-08-20 14:24:50 +10001245struct hash_desc;
Herbert Xu9409f382006-08-06 19:49:12 +10001246struct scatterlist;
Herbert Xu07d4ee52006-08-20 14:24:50 +10001247typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1248 unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249
Herbert Xu07d4ee52006-08-20 14:24:50 +10001250extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1251 int offset, int len, icv_update_fn_t icv_update);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252
1253static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1254 int family)
1255{
1256 switch (family) {
1257 default:
1258 case AF_INET:
Al Viro8c689a62006-11-08 00:20:21 -08001259 return (__force __u32)a->a4 - (__force __u32)b->a4;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 case AF_INET6:
1261 return ipv6_addr_cmp((struct in6_addr *)a,
1262 (struct in6_addr *)b);
1263 }
1264}
1265
Herbert Xu77d8d7a2005-10-05 12:15:12 -07001266static inline int xfrm_policy_id2dir(u32 index)
1267{
1268 return index & 7;
1269}
1270
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001271static inline int xfrm_aevent_is_on(void)
1272{
Patrick McHardybe336902006-03-20 22:40:54 -08001273 struct sock *nlsk;
1274 int ret = 0;
1275
1276 rcu_read_lock();
1277 nlsk = rcu_dereference(xfrm_nl);
1278 if (nlsk)
1279 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1280 rcu_read_unlock();
1281 return ret;
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001282}
1283
Eric Dumazet0f99be02008-01-08 23:39:06 -08001284static inline int xfrm_alg_len(struct xfrm_algo *alg)
1285{
1286 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1287}
1288
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001289#ifdef CONFIG_XFRM_MIGRATE
1290static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1291{
Eric Dumazet0f99be02008-01-08 23:39:06 -08001292 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001293}
1294
1295static inline void xfrm_states_put(struct xfrm_state **states, int n)
1296{
1297 int i;
1298 for (i = 0; i < n; i++)
1299 xfrm_state_put(*(states + i));
1300}
1301
1302static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1303{
1304 int i;
1305 for (i = 0; i < n; i++)
1306 xfrm_state_delete(*(states + i));
1307}
1308#endif
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001309
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310#endif /* _NET_XFRM_H */