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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 */
David S. Miller8f126e32006-08-24 02:45:07 -0700124 struct hlist_node bydst;
125 struct hlist_node bysrc;
126 struct hlist_node byspi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
128 atomic_t refcnt;
129 spinlock_t lock;
130
131 struct xfrm_id id;
132 struct xfrm_selector sel;
133
David S. Miller9d4a7062006-08-24 03:18:09 -0700134 u32 genid;
135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 /* Key manger bits */
137 struct {
138 u8 state;
139 u8 dying;
140 u32 seq;
141 } km;
142
143 /* Parameters of this state. */
144 struct {
145 u32 reqid;
146 u8 mode;
147 u8 replay_window;
148 u8 aalgo, ealgo, calgo;
149 u8 flags;
150 u16 family;
151 xfrm_address_t saddr;
152 int header_len;
153 int trailer_len;
154 } props;
155
156 struct xfrm_lifetime_cfg lft;
157
158 /* Data for transformer */
159 struct xfrm_algo *aalg;
160 struct xfrm_algo *ealg;
161 struct xfrm_algo *calg;
162
163 /* Data for encapsulator */
164 struct xfrm_encap_tmpl *encap;
165
Noriaki TAKAMIYA060f02a2006-08-23 18:18:55 -0700166 /* Data for care-of address */
167 xfrm_address_t *coaddr;
168
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
170 struct xfrm_state *tunnel;
171
172 /* If a tunnel, number of users + 1 */
173 atomic_t tunnel_users;
174
175 /* State for replay detection */
176 struct xfrm_replay_state replay;
177
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800178 /* Replay detection state at the time we sent the last notification */
179 struct xfrm_replay_state preplay;
180
Jamal Hadi Salim27170962006-04-14 15:03:05 -0700181 /* internal flag that only holds state for delayed aevent at the
182 * moment
183 */
184 u32 xflags;
185
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800186 /* Replay detection notification settings */
187 u32 replay_maxage;
188 u32 replay_maxdiff;
189
190 /* Replay detection notification timer */
191 struct timer_list rtimer;
192
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 /* Statistics */
194 struct xfrm_stats stats;
195
196 struct xfrm_lifetime_cur curlft;
197 struct timer_list timer;
198
Masahide NAKAMURA9afaca02006-08-23 18:20:16 -0700199 /* Last used time */
Herbert Xud26f3982007-11-13 21:47:08 -0800200 unsigned long lastused;
Masahide NAKAMURA9afaca02006-08-23 18:20:16 -0700201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 /* Reference to data common to all the instances of this
203 * transformer. */
204 struct xfrm_type *type;
Herbert Xu13996372007-10-17 21:35:51 -0700205 struct xfrm_mode *inner_mode;
206 struct xfrm_mode *outer_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
Trent Jaegerdf718372005-12-13 23:12:27 -0800208 /* Security context */
209 struct xfrm_sec_ctx *security;
210
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 /* Private data of this transformer, format is opaque,
212 * interpreted by xfrm_type methods. */
213 void *data;
214};
215
Jamal Hadi Salim27170962006-04-14 15:03:05 -0700216/* xflags - make enum if more show up */
217#define XFRM_TIME_DEFER 1
218
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219enum {
220 XFRM_STATE_VOID,
221 XFRM_STATE_ACQ,
222 XFRM_STATE_VALID,
223 XFRM_STATE_ERROR,
224 XFRM_STATE_EXPIRED,
225 XFRM_STATE_DEAD
226};
227
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700228/* callback structure passed from either netlink or pfkey */
229struct km_event
230{
Herbert Xubf088672005-06-18 22:44:00 -0700231 union {
232 u32 hard;
233 u32 proto;
234 u32 byid;
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800235 u32 aevent;
Masahide NAKAMURAf7b69832006-08-23 22:49:28 -0700236 u32 type;
Herbert Xubf088672005-06-18 22:44:00 -0700237 } data;
238
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700239 u32 seq;
240 u32 pid;
241 u32 event;
242};
243
Herbert Xu25ee3282007-12-11 09:32:34 -0800244struct net_device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245struct xfrm_type;
246struct xfrm_dst;
247struct xfrm_policy_afinfo {
248 unsigned short family;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 struct dst_ops *dst_ops;
250 void (*garbage_collect)(void);
Herbert Xu66cdb3c2007-11-13 21:37:28 -0800251 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr,
252 xfrm_address_t *daddr);
Patrick McHardya1e59ab2006-09-19 12:57:34 -0700253 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 void (*decode_session)(struct sk_buff *skb,
Herbert Xud5422ef2007-12-12 10:44:16 -0800256 struct flowi *fl,
257 int reverse);
Herbert Xu25ee3282007-12-11 09:32:34 -0800258 int (*get_tos)(struct flowi *fl);
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -0800259 int (*init_path)(struct xfrm_dst *path,
260 struct dst_entry *dst,
261 int nfheader_len);
Herbert Xu25ee3282007-12-11 09:32:34 -0800262 int (*fill_dst)(struct xfrm_dst *xdst,
263 struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264};
265
266extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
267extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700268extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
269extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271struct xfrm_tmpl;
Jamal Hadi Salim980ebd22006-03-20 19:16:40 -0800272extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
Jamal Hadi Salim53bc6b42006-03-20 19:17:03 -0800273extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
274extern int __xfrm_state_delete(struct xfrm_state *x);
275
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276struct xfrm_state_afinfo {
Herbert Xu17c2a422007-10-17 21:33:12 -0700277 unsigned int family;
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800278 unsigned int proto;
Herbert Xu227620e2007-11-13 21:41:28 -0800279 unsigned int eth_proto;
Herbert Xu17c2a422007-10-17 21:33:12 -0700280 struct module *owner;
Herbert Xuaa5d62c2007-10-17 21:31:12 -0700281 struct xfrm_type *type_map[IPPROTO_MAX];
282 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
Herbert Xud094cd82005-06-20 13:19:41 -0700283 int (*init_flags)(struct xfrm_state *x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
285 struct xfrm_tmpl *tmpl,
286 xfrm_address_t *daddr, xfrm_address_t *saddr);
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -0700287 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
288 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
Miika Komucdca7262007-02-06 14:24:56 -0800289 int (*output)(struct sk_buff *skb);
Herbert Xu227620e2007-11-13 21:41:28 -0800290 int (*extract_input)(struct xfrm_state *x,
291 struct sk_buff *skb);
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800292 int (*extract_output)(struct xfrm_state *x,
293 struct sk_buff *skb);
Herbert Xu716062f2007-11-13 21:44:23 -0800294 int (*transport_finish)(struct sk_buff *skb,
295 int async);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296};
297
298extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
299extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
300
301extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
302
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303struct xfrm_type
304{
305 char *description;
306 struct module *owner;
307 __u8 proto;
Masahide NAKAMURA1b5c2292006-08-23 18:11:50 -0700308 __u8 flags;
309#define XFRM_TYPE_NON_FRAGMENT 1
Herbert Xu436a0a42007-10-08 17:25:53 -0700310#define XFRM_TYPE_REPLAY_PROT 2
Herbert Xuf04e7e82007-11-13 21:36:51 -0800311#define XFRM_TYPE_LOCAL_COADDR 4
312#define XFRM_TYPE_REMOTE_COADDR 8
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
Herbert Xu72cb6962005-06-20 13:18:08 -0700314 int (*init_state)(struct xfrm_state *x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 void (*destructor)(struct xfrm_state *);
Herbert Xue6956332006-04-01 00:52:46 -0800316 int (*input)(struct xfrm_state *, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -0700318 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
Masahide NAKAMURAaee5adb2006-08-23 17:57:28 -0700319 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 /* Estimate maximal size of result of transformation of a dgram */
Patrick McHardyc5c25232007-04-09 11:47:18 -0700321 u32 (*get_mtu)(struct xfrm_state *, int size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322};
323
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
325extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Herbert Xub59f45d2006-05-27 23:05:54 -0700327struct xfrm_mode {
Herbert Xu227620e2007-11-13 21:41:28 -0800328 /*
329 * Remove encapsulation header.
330 *
331 * The IP header will be moved over the top of the encapsulation
332 * header.
333 *
334 * On entry, the transport header shall point to where the IP header
335 * should be and the network header shall be set to where the IP
336 * header currently is. skb->data shall point to the start of the
337 * payload.
338 */
339 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
340
341 /*
342 * This is the actual input entry point.
343 *
344 * For transport mode and equivalent this would be identical to
345 * input2 (which does not need to be set). While tunnel mode
346 * and equivalent would set this to the tunnel encapsulation function
347 * xfrm4_prepare_input that would in turn call input2.
348 */
Herbert Xub59f45d2006-05-27 23:05:54 -0700349 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu37fedd32007-10-10 15:44:44 -0700350
351 /*
352 * Add encapsulation header.
353 *
354 * On exit, the transport header will be set to the start of the
355 * encapsulation header to be filled in by x->type->output and
356 * the mac header will be set to the nextheader (protocol for
357 * IPv4) field of the extension header directly preceding the
358 * encapsulation header, or in its absence, that of the top IP
359 * header. The value of the network header will always point
360 * to the top IP header while skb->data will point to the payload.
361 */
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800362 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
363
364 /*
365 * This is the actual output entry point.
366 *
367 * For transport mode and equivalent this would be identical to
368 * output2 (which does not need to be set). While tunnel mode
369 * and equivalent would set this to a tunnel encapsulation function
370 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
371 * call output2.
372 */
373 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xub59f45d2006-05-27 23:05:54 -0700374
Herbert Xu17c2a422007-10-17 21:33:12 -0700375 struct xfrm_state_afinfo *afinfo;
Herbert Xub59f45d2006-05-27 23:05:54 -0700376 struct module *owner;
377 unsigned int encap;
Herbert Xu1bfcb102007-10-17 21:31:50 -0700378 int flags;
379};
380
381/* Flags for xfrm_mode. */
382enum {
383 XFRM_MODE_FLAG_TUNNEL = 1,
Herbert Xub59f45d2006-05-27 23:05:54 -0700384};
385
386extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
387extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
Herbert Xub59f45d2006-05-27 23:05:54 -0700388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389struct xfrm_tmpl
390{
391/* id in template is interpreted as:
392 * daddr - destination of tunnel, may be zero for transport mode.
393 * spi - zero to acquire spi. Not zero if spi is static, then
394 * daddr must be fixed too.
395 * proto - AH/ESP/IPCOMP
396 */
397 struct xfrm_id id;
398
399/* Source address of tunnel. Ignored, if it is not a tunnel. */
400 xfrm_address_t saddr;
401
Miika Komu76b3f052006-11-30 16:40:43 -0800402 unsigned short encap_family;
403
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 __u32 reqid;
405
Masahide NAKAMURA7e49e6d2006-09-22 15:05:15 -0700406/* Mode: transport, tunnel etc. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 __u8 mode;
408
409/* Sharing mode: unique, this session only, this user only etc. */
410 __u8 share;
411
412/* May skip this transfomration if no SA is found */
413 __u8 optional;
414
415/* Bit mask of algos allowed for acquisition */
416 __u32 aalgos;
417 __u32 ealgos;
418 __u32 calgos;
419};
420
Masahide NAKAMURA622dc822006-08-23 17:52:01 -0700421#define XFRM_MAX_DEPTH 6
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
423struct xfrm_policy
424{
425 struct xfrm_policy *next;
David S. Miller2518c7c2006-08-24 04:45:07 -0700426 struct hlist_node bydst;
427 struct hlist_node byidx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428
429 /* This lock only affects elements except for entry. */
430 rwlock_t lock;
431 atomic_t refcnt;
432 struct timer_list timer;
433
434 u32 priority;
435 u32 index;
436 struct xfrm_selector selector;
437 struct xfrm_lifetime_cfg lft;
438 struct xfrm_lifetime_cur curlft;
439 struct dst_entry *bundles;
Arnaldo Carvalho de Melo46ca5f52006-11-27 17:58:59 -0200440 u16 family;
441 u8 type;
442 u8 action;
443 u8 flags;
444 u8 dead;
445 u8 xfrm_nr;
446 /* XXX 1 byte hole, try to pack */
Trent Jaegerdf718372005-12-13 23:12:27 -0800447 struct xfrm_sec_ctx *security;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
449};
450
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -0800451struct xfrm_migrate {
452 xfrm_address_t old_daddr;
453 xfrm_address_t old_saddr;
454 xfrm_address_t new_daddr;
455 xfrm_address_t new_saddr;
456 u8 proto;
457 u8 mode;
458 u16 reserved;
459 u32 reqid;
460 u16 old_family;
461 u16 new_family;
462};
463
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800464#define XFRM_KM_TIMEOUT 30
465/* which seqno */
466#define XFRM_REPLAY_SEQ 1
467#define XFRM_REPLAY_OSEQ 2
468#define XFRM_REPLAY_SEQ_MASK 3
469/* what happened */
470#define XFRM_REPLAY_UPDATE XFRM_AE_CR
471#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
472
473/* default aevent timeout in units of 100ms */
474#define XFRM_AE_ETIME 10
475/* Async Event timer multiplier */
476#define XFRM_AE_ETH_M 10
477/* default seq threshold size */
478#define XFRM_AE_SEQT_SIZE 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
480struct xfrm_mgr
481{
482 struct list_head list;
483 char *id;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700484 int (*notify)(struct xfrm_state *x, struct km_event *c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
Venkat Yekkiralacb969f02006-07-24 23:32:20 -0700486 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
Al Viro5d36b182006-11-08 00:24:06 -0800487 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700488 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
Masahide NAKAMURA97a64b42006-08-23 20:44:06 -0700489 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -0800490 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491};
492
493extern int xfrm_register_km(struct xfrm_mgr *km);
494extern int xfrm_unregister_km(struct xfrm_mgr *km);
495
David S. Miller2518c7c2006-08-24 04:45:07 -0700496extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
Herbert Xu436a0a42007-10-08 17:25:53 -0700498/*
499 * This structure is used for the duration where packets are being
500 * transformed by IPsec. As soon as the packet leaves IPsec the
501 * area beyond the generic IP part may be overwritten.
502 */
503struct xfrm_skb_cb {
504 union {
505 struct inet_skb_parm h4;
506 struct inet6_skb_parm h6;
507 } header;
508
509 /* Sequence number for replay protection. */
510 u64 seq;
511};
512
513#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
514
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800515/*
516 * This structure is used by the afinfo prepare_input/prepare_output functions
517 * to transmit header information to the mode input/output functions.
518 */
519struct xfrm_mode_skb_cb {
520 union {
521 struct inet_skb_parm h4;
522 struct inet6_skb_parm h6;
523 } header;
524
525 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
526 __be16 id;
527 __be16 frag_off;
528
529 /* TOS for IPv4, class for IPv6. */
530 u8 tos;
531
532 /* TTL for IPv4, hop limitfor IPv6. */
533 u8 ttl;
534
535 /* Protocol for IPv4, NH for IPv6. */
536 u8 protocol;
537
538 /* Used by IPv6 only, zero for IPv4. */
539 u8 flow_lbl[3];
540};
541
542#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
543
Herbert Xu716062f2007-11-13 21:44:23 -0800544/*
545 * This structure is used by the input processing to locate the SPI and
546 * related information.
547 */
548struct xfrm_spi_skb_cb {
549 union {
550 struct inet_skb_parm h4;
551 struct inet6_skb_parm h6;
552 } header;
553
Herbert Xu716062f2007-11-13 21:44:23 -0800554 unsigned int daddroff;
Herbert Xu2fcb45b2007-12-03 22:54:12 -0800555 unsigned int family;
Herbert Xu716062f2007-11-13 21:44:23 -0800556};
557
558#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
559
Joy Latten161a09e2006-11-27 13:11:54 -0600560/* Audit Information */
561struct xfrm_audit
562{
Joy Lattenab5f5e82007-09-17 11:51:22 -0700563 u32 loginuid;
Joy Latten161a09e2006-11-27 13:11:54 -0600564 u32 secid;
565};
Joy Lattenc9204d92006-11-30 15:50:43 -0600566
567#ifdef CONFIG_AUDITSYSCALL
Paul Mooreafeb14b2007-12-21 14:58:11 -0800568static inline struct audit_buffer *xfrm_audit_start(const char *op)
Joy Lattenab5f5e82007-09-17 11:51:22 -0700569{
570 struct audit_buffer *audit_buf = NULL;
Paul Mooreafeb14b2007-12-21 14:58:11 -0800571
572 if (audit_enabled == 0)
573 return NULL;
574 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
575 AUDIT_MAC_IPSEC_EVENT);
576 if (audit_buf == NULL)
577 return NULL;
578 audit_log_format(audit_buf, "op=%s", op);
579 return audit_buf;
580}
581
582static inline void xfrm_audit_helper_usrinfo(u32 auid, u32 secid,
583 struct audit_buffer *audit_buf)
584{
Joy Lattenab5f5e82007-09-17 11:51:22 -0700585 char *secctx;
586 u32 secctx_len;
587
Paul Mooreafeb14b2007-12-21 14:58:11 -0800588 audit_log_format(audit_buf, " auid=%u", auid);
Paul Moore68277ac2007-12-20 20:49:33 -0800589 if (secid != 0 &&
590 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
Joy Lattenab5f5e82007-09-17 11:51:22 -0700591 audit_log_format(audit_buf, " subj=%s", secctx);
592 security_release_secctx(secctx, secctx_len);
593 } else
594 audit_log_task_context(audit_buf);
Joy Lattenab5f5e82007-09-17 11:51:22 -0700595}
596
597extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
Paul Moore68277ac2007-12-20 20:49:33 -0800598 u32 auid, u32 secid);
Joy Lattenab5f5e82007-09-17 11:51:22 -0700599extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
Paul Moore68277ac2007-12-20 20:49:33 -0800600 u32 auid, u32 secid);
Joy Lattenab5f5e82007-09-17 11:51:22 -0700601extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
Paul Moore68277ac2007-12-20 20:49:33 -0800602 u32 auid, u32 secid);
Joy Lattenab5f5e82007-09-17 11:51:22 -0700603extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
Paul Moore68277ac2007-12-20 20:49:33 -0800604 u32 auid, u32 secid);
Paul Mooreafeb14b2007-12-21 14:58:11 -0800605extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
606 struct sk_buff *skb);
607extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
608extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
609 __be32 net_spi, __be32 net_seq);
610extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
611 struct sk_buff *skb, u8 proto);
Joy Lattenc9204d92006-11-30 15:50:43 -0600612#else
Joy Lattenab5f5e82007-09-17 11:51:22 -0700613#define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0)
614#define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0)
615#define xfrm_audit_state_add(x, r, a, s) do { ; } while (0)
616#define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0)
Paul Mooreafeb14b2007-12-21 14:58:11 -0800617#define xfrm_audit_state_replay_overflow(x, s) do { ; } while (0)
618#define xfrm_audit_state_notfound_simple(s, f) do { ; } while (0)
619#define xfrm_audit_state_notfound(s, f, sp, sq) do { ; } while (0)
620#define xfrm_audit_state_icvfail(x, s, p) do { ; } while (0)
Joy Lattenc9204d92006-11-30 15:50:43 -0600621#endif /* CONFIG_AUDITSYSCALL */
Joy Latten161a09e2006-11-27 13:11:54 -0600622
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623static inline void xfrm_pol_hold(struct xfrm_policy *policy)
624{
625 if (likely(policy != NULL))
626 atomic_inc(&policy->refcnt);
627}
628
WANG Cong64c31b32008-01-07 22:34:29 -0800629extern void xfrm_policy_destroy(struct xfrm_policy *policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630
631static inline void xfrm_pol_put(struct xfrm_policy *policy)
632{
633 if (atomic_dec_and_test(&policy->refcnt))
WANG Cong64c31b32008-01-07 22:34:29 -0800634 xfrm_policy_destroy(policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635}
636
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700637#ifdef CONFIG_XFRM_SUB_POLICY
638static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
639{
640 int i;
641 for (i = npols - 1; i >= 0; --i)
642 xfrm_pol_put(pols[i]);
643}
644#else
645static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
646{
647 xfrm_pol_put(pols[0]);
648}
649#endif
650
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651extern void __xfrm_state_destroy(struct xfrm_state *);
652
Herbert Xu21380b82006-02-22 14:47:13 -0800653static inline void __xfrm_state_put(struct xfrm_state *x)
654{
655 atomic_dec(&x->refcnt);
656}
657
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658static inline void xfrm_state_put(struct xfrm_state *x)
659{
660 if (atomic_dec_and_test(&x->refcnt))
661 __xfrm_state_destroy(x);
662}
663
664static inline void xfrm_state_hold(struct xfrm_state *x)
665{
666 atomic_inc(&x->refcnt);
667}
668
669static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
670{
Al Viro5f193432006-09-27 18:46:32 -0700671 __be32 *a1 = token1;
672 __be32 *a2 = token2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 int pdw;
674 int pbi;
675
676 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
677 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
678
679 if (pdw)
680 if (memcmp(a1, a2, pdw << 2))
681 return 0;
682
683 if (pbi) {
Al Viro5f193432006-09-27 18:46:32 -0700684 __be32 mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685
686 mask = htonl((0xffffffff) << (32 - pbi));
687
688 if ((a1[pdw] ^ a2[pdw]) & mask)
689 return 0;
690 }
691
692 return 1;
693}
694
695static __inline__
Al Virof9d07e41f82006-09-27 18:45:50 -0700696__be16 xfrm_flowi_sport(struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697{
Al Virof9d07e41f82006-09-27 18:45:50 -0700698 __be16 port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 switch(fl->proto) {
700 case IPPROTO_TCP:
701 case IPPROTO_UDP:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800702 case IPPROTO_UDPLITE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 case IPPROTO_SCTP:
704 port = fl->fl_ip_sport;
705 break;
706 case IPPROTO_ICMP:
707 case IPPROTO_ICMPV6:
708 port = htons(fl->fl_icmp_type);
709 break;
Masahide NAKAMURA2ce42722006-08-23 20:39:03 -0700710 case IPPROTO_MH:
711 port = htons(fl->fl_mh_type);
712 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 default:
714 port = 0; /*XXX*/
715 }
716 return port;
717}
718
719static __inline__
Al Virof9d07e41f82006-09-27 18:45:50 -0700720__be16 xfrm_flowi_dport(struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721{
Al Virof9d07e41f82006-09-27 18:45:50 -0700722 __be16 port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 switch(fl->proto) {
724 case IPPROTO_TCP:
725 case IPPROTO_UDP:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800726 case IPPROTO_UDPLITE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 case IPPROTO_SCTP:
728 port = fl->fl_ip_dport;
729 break;
730 case IPPROTO_ICMP:
731 case IPPROTO_ICMPV6:
732 port = htons(fl->fl_icmp_code);
733 break;
734 default:
735 port = 0; /*XXX*/
736 }
737 return port;
738}
739
Andrew Morton77681022006-11-08 22:46:26 -0800740extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
741 unsigned short family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742
Trent Jaegerdf718372005-12-13 23:12:27 -0800743#ifdef CONFIG_SECURITY_NETWORK_XFRM
744/* If neither has a context --> match
745 * Otherwise, both must have a context and the sids, doi, alg must match
746 */
747static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
748{
749 return ((!s1 && !s2) ||
750 (s1 && s2 &&
751 (s1->ctx_sid == s2->ctx_sid) &&
752 (s1->ctx_doi == s2->ctx_doi) &&
753 (s1->ctx_alg == s2->ctx_alg)));
754}
755#else
756static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
757{
758 return 1;
759}
760#endif
761
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762/* A struct encoding bundle of transformations to apply to some set of flow.
763 *
764 * dst->child points to the next element of bundle.
765 * dst->xfrm points to an instanse of transformer.
766 *
767 * Due to unfortunate limitations of current routing cache, which we
768 * have no time to fix, it mirrors struct rtable and bound to the same
769 * routing key, including saddr,daddr. However, we can have many of
770 * bundles differing by session id. All the bundles grow from a parent
771 * policy rule.
772 */
773struct xfrm_dst
774{
775 union {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 struct dst_entry dst;
777 struct rtable rt;
778 struct rt6_info rt6;
779 } u;
780 struct dst_entry *route;
Masahide NAKAMURA157bfc22007-04-30 00:33:35 -0700781#ifdef CONFIG_XFRM_SUB_POLICY
782 struct flowi *origin;
783 struct xfrm_selector *partner;
784#endif
David S. Miller9d4a7062006-08-24 03:18:09 -0700785 u32 genid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 u32 route_mtu_cached;
787 u32 child_mtu_cached;
Hideaki YOSHIFUJI92d63de2005-05-26 12:58:04 -0700788 u32 route_cookie;
789 u32 path_cookie;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790};
791
Herbert Xuaabc9762005-05-03 16:27:10 -0700792static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
793{
794 dst_release(xdst->route);
795 if (likely(xdst->u.dst.xfrm))
796 xfrm_state_put(xdst->u.dst.xfrm);
Masahide NAKAMURA157bfc22007-04-30 00:33:35 -0700797#ifdef CONFIG_XFRM_SUB_POLICY
798 kfree(xdst->origin);
799 xdst->origin = NULL;
800 kfree(xdst->partner);
801 xdst->partner = NULL;
802#endif
Herbert Xuaabc9762005-05-03 16:27:10 -0700803}
804
805extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
806
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807struct sec_path
808{
809 atomic_t refcnt;
810 int len;
Herbert Xudbe5b4a2006-04-01 00:54:16 -0800811 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812};
813
814static inline struct sec_path *
815secpath_get(struct sec_path *sp)
816{
817 if (sp)
818 atomic_inc(&sp->refcnt);
819 return sp;
820}
821
822extern void __secpath_destroy(struct sec_path *sp);
823
824static inline void
825secpath_put(struct sec_path *sp)
826{
827 if (sp && atomic_dec_and_test(&sp->refcnt))
828 __secpath_destroy(sp);
829}
830
831extern struct sec_path *secpath_dup(struct sec_path *src);
832
833static inline void
834secpath_reset(struct sk_buff *skb)
835{
836#ifdef CONFIG_XFRM
837 secpath_put(skb->sp);
838 skb->sp = NULL;
839#endif
840}
841
842static inline int
Patrick McHardya1e59ab2006-09-19 12:57:34 -0700843xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
844{
845 switch (family) {
846 case AF_INET:
847 return addr->a4 == 0;
848 case AF_INET6:
849 return ipv6_addr_any((struct in6_addr *)&addr->a6);
850 }
851 return 0;
852}
853
854static inline int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855__xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
856{
857 return (tmpl->saddr.a4 &&
858 tmpl->saddr.a4 != x->props.saddr.a4);
859}
860
861static inline int
862__xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
863{
864 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
865 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
866}
867
868static inline int
869xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
870{
871 switch (family) {
872 case AF_INET:
873 return __xfrm4_state_addr_cmp(tmpl, x);
874 case AF_INET6:
875 return __xfrm6_state_addr_cmp(tmpl, x);
876 }
877 return !0;
878}
879
880#ifdef CONFIG_XFRM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
882
Herbert Xud5422ef2007-12-12 10:44:16 -0800883static inline int __xfrm_policy_check2(struct sock *sk, int dir,
884 struct sk_buff *skb,
885 unsigned int family, int reverse)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886{
Herbert Xud5422ef2007-12-12 10:44:16 -0800887 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
888
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 if (sk && sk->sk_policy[XFRM_POLICY_IN])
Herbert Xud5422ef2007-12-12 10:44:16 -0800890 return __xfrm_policy_check(sk, ndir, skb, family);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700891
David S. Miller2518c7c2006-08-24 04:45:07 -0700892 return (!xfrm_policy_count[dir] && !skb->sp) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 (skb->dst->flags & DST_NOPOLICY) ||
Herbert Xud5422ef2007-12-12 10:44:16 -0800894 __xfrm_policy_check(sk, ndir, skb, family);
895}
896
897static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
898{
899 return __xfrm_policy_check2(sk, dir, skb, family, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900}
901
902static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
903{
904 return xfrm_policy_check(sk, dir, skb, AF_INET);
905}
906
907static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
908{
909 return xfrm_policy_check(sk, dir, skb, AF_INET6);
910}
911
Herbert Xud5422ef2007-12-12 10:44:16 -0800912static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
913 struct sk_buff *skb)
914{
915 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
916}
917
918static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
919 struct sk_buff *skb)
920{
921 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
922}
923
924extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
925 unsigned int family, int reverse);
926
927static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
928 unsigned int family)
929{
930 return __xfrm_decode_session(skb, fl, family, 0);
931}
932
933static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
934 struct flowi *fl,
935 unsigned int family)
936{
937 return __xfrm_decode_session(skb, fl, family, 1);
938}
939
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
941
942static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
943{
David S. Miller2518c7c2006-08-24 04:45:07 -0700944 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 (skb->dst->flags & DST_NOXFRM) ||
946 __xfrm_route_forward(skb, family);
947}
948
949static inline int xfrm4_route_forward(struct sk_buff *skb)
950{
951 return xfrm_route_forward(skb, AF_INET);
952}
953
954static inline int xfrm6_route_forward(struct sk_buff *skb)
955{
956 return xfrm_route_forward(skb, AF_INET6);
957}
958
959extern int __xfrm_sk_clone_policy(struct sock *sk);
960
961static inline int xfrm_sk_clone_policy(struct sock *sk)
962{
963 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
964 return __xfrm_sk_clone_policy(sk);
965 return 0;
966}
967
Herbert Xu4666faa2005-06-18 22:43:22 -0700968extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969
970static inline void xfrm_sk_free_policy(struct sock *sk)
971{
972 if (unlikely(sk->sk_policy[0] != NULL)) {
973 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
974 sk->sk_policy[0] = NULL;
975 }
976 if (unlikely(sk->sk_policy[1] != NULL)) {
977 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
978 sk->sk_policy[1] = NULL;
979 }
980}
981
982#else
983
984static inline void xfrm_sk_free_policy(struct sock *sk) {}
985static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
986static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
987static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
988static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
989{
990 return 1;
991}
992static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
993{
994 return 1;
995}
996static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
997{
998 return 1;
999}
Herbert Xud5422ef2007-12-12 10:44:16 -08001000static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1001 struct flowi *fl,
1002 unsigned int family)
1003{
1004 return -ENOSYS;
1005}
1006static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1007 struct sk_buff *skb)
1008{
1009 return 1;
1010}
1011static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1012 struct sk_buff *skb)
1013{
1014 return 1;
1015}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016#endif
1017
1018static __inline__
1019xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1020{
1021 switch (family){
1022 case AF_INET:
1023 return (xfrm_address_t *)&fl->fl4_dst;
1024 case AF_INET6:
1025 return (xfrm_address_t *)&fl->fl6_dst;
1026 }
1027 return NULL;
1028}
1029
1030static __inline__
1031xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1032{
1033 switch (family){
1034 case AF_INET:
1035 return (xfrm_address_t *)&fl->fl4_src;
1036 case AF_INET6:
1037 return (xfrm_address_t *)&fl->fl6_src;
1038 }
1039 return NULL;
1040}
1041
1042static __inline__ int
1043__xfrm4_state_addr_check(struct xfrm_state *x,
1044 xfrm_address_t *daddr, xfrm_address_t *saddr)
1045{
1046 if (daddr->a4 == x->id.daddr.a4 &&
1047 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1048 return 1;
1049 return 0;
1050}
1051
1052static __inline__ int
1053__xfrm6_state_addr_check(struct xfrm_state *x,
1054 xfrm_address_t *daddr, xfrm_address_t *saddr)
1055{
1056 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1057 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1058 ipv6_addr_any((struct in6_addr *)saddr) ||
1059 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1060 return 1;
1061 return 0;
1062}
1063
1064static __inline__ int
1065xfrm_state_addr_check(struct xfrm_state *x,
1066 xfrm_address_t *daddr, xfrm_address_t *saddr,
1067 unsigned short family)
1068{
1069 switch (family) {
1070 case AF_INET:
1071 return __xfrm4_state_addr_check(x, daddr, saddr);
1072 case AF_INET6:
1073 return __xfrm6_state_addr_check(x, daddr, saddr);
1074 }
1075 return 0;
1076}
1077
Masahide NAKAMURAe53820d2006-08-23 19:12:01 -07001078static __inline__ int
1079xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1080 unsigned short family)
1081{
1082 switch (family) {
1083 case AF_INET:
1084 return __xfrm4_state_addr_check(x,
1085 (xfrm_address_t *)&fl->fl4_dst,
1086 (xfrm_address_t *)&fl->fl4_src);
1087 case AF_INET6:
1088 return __xfrm6_state_addr_check(x,
1089 (xfrm_address_t *)&fl->fl6_dst,
1090 (xfrm_address_t *)&fl->fl6_src);
1091 }
1092 return 0;
1093}
1094
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095static inline int xfrm_state_kern(struct xfrm_state *x)
1096{
1097 return atomic_read(&x->tunnel_users);
1098}
1099
Masahide NAKAMURA57947082006-09-22 15:06:24 -07001100static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1101{
Masahide NAKAMURAdc00a522006-08-23 17:49:52 -07001102 return (!userproto || proto == userproto ||
1103 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1104 proto == IPPROTO_ESP ||
1105 proto == IPPROTO_COMP)));
Masahide NAKAMURA57947082006-09-22 15:06:24 -07001106}
1107
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108/*
1109 * xfrm algorithm information
1110 */
1111struct xfrm_algo_auth_info {
1112 u16 icv_truncbits;
1113 u16 icv_fullbits;
1114};
1115
1116struct xfrm_algo_encr_info {
1117 u16 blockbits;
1118 u16 defkeybits;
1119};
1120
1121struct xfrm_algo_comp_info {
1122 u16 threshold;
1123};
1124
1125struct xfrm_algo_desc {
1126 char *name;
Herbert Xu04ff1262006-08-13 08:50:00 +10001127 char *compat;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 u8 available:1;
1129 union {
1130 struct xfrm_algo_auth_info auth;
1131 struct xfrm_algo_encr_info encr;
1132 struct xfrm_algo_comp_info comp;
1133 } uinfo;
1134 struct sadb_alg desc;
1135};
1136
1137/* XFRM tunnel handlers. */
1138struct xfrm_tunnel {
1139 int (*handler)(struct sk_buff *skb);
Herbert Xud2acc342006-03-28 01:12:13 -08001140 int (*err_handler)(struct sk_buff *skb, __u32 info);
1141
1142 struct xfrm_tunnel *next;
1143 int priority;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144};
1145
1146struct xfrm6_tunnel {
Herbert Xud2acc342006-03-28 01:12:13 -08001147 int (*handler)(struct sk_buff *skb);
1148 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
Al Viro04ce6902006-11-08 00:21:01 -08001149 int type, int code, int offset, __be32 info);
Herbert Xud2acc342006-03-28 01:12:13 -08001150 struct xfrm6_tunnel *next;
1151 int priority;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152};
1153
1154extern void xfrm_init(void);
1155extern void xfrm4_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156extern void xfrm_state_init(void);
1157extern void xfrm4_state_init(void);
Daniel Lezcanoc35b7e72007-12-08 00:14:11 -08001158#ifdef CONFIG_XFRM
1159extern int xfrm6_init(void);
1160extern void xfrm6_fini(void);
Daniel Lezcano0013cab2007-12-07 00:42:11 -08001161extern int xfrm6_state_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162extern void xfrm6_state_fini(void);
Daniel Lezcanoc35b7e72007-12-08 00:14:11 -08001163#else
1164static inline int xfrm6_init(void)
1165{
1166 return 0;
1167}
1168static inline void xfrm6_fini(void)
1169{
1170 ;
1171}
1172#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08001174#ifdef CONFIG_XFRM_STATISTICS
1175extern int xfrm_proc_init(void);
1176#endif
1177
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
1179extern struct xfrm_state *xfrm_state_alloc(void);
1180extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1181 struct flowi *fl, struct xfrm_tmpl *tmpl,
1182 struct xfrm_policy *pol, int *err,
1183 unsigned short family);
Jamal Hadi Salim628529b2007-07-02 22:41:14 -07001184extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1185 xfrm_address_t *saddr,
1186 unsigned short family,
1187 u8 mode, u8 proto, u32 reqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188extern int xfrm_state_check_expire(struct xfrm_state *x);
1189extern void xfrm_state_insert(struct xfrm_state *x);
1190extern int xfrm_state_add(struct xfrm_state *x);
1191extern int xfrm_state_update(struct xfrm_state *x);
Al Viroa94cfd12006-09-27 18:47:24 -07001192extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
Masahide NAKAMURAeb2971b2006-08-23 17:56:04 -07001193extern 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 -07001194#ifdef CONFIG_XFRM_SUB_POLICY
1195extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1196 int n, unsigned short family);
1197extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1198 int n, unsigned short family);
1199#else
1200static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1201 int n, unsigned short family)
1202{
1203 return -ENOSYS;
1204}
1205
1206static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1207 int n, unsigned short family)
1208{
1209 return -ENOSYS;
1210}
1211#endif
Jamal Hadi Salimaf11e312007-05-04 12:55:13 -07001212
1213struct xfrmk_sadinfo {
1214 u32 sadhcnt; /* current hash bkts */
1215 u32 sadhmcnt; /* max allowed hash bkts */
1216 u32 sadcnt; /* current running count */
1217};
1218
Jamal Hadi Salim5a6d3412007-05-04 12:55:39 -07001219struct xfrmk_spdinfo {
1220 u32 incnt;
1221 u32 outcnt;
1222 u32 fwdcnt;
1223 u32 inscnt;
1224 u32 outscnt;
1225 u32 fwdscnt;
1226 u32 spdhcnt;
1227 u32 spdhmcnt;
1228};
1229
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -07001231extern int xfrm_state_delete(struct xfrm_state *x);
Joy Latten4aa2e622007-06-04 19:05:57 -04001232extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
Jamal Hadi Salimaf11e312007-05-04 12:55:13 -07001233extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
Jamal Hadi Salim5a6d3412007-05-04 12:55:39 -07001234extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
Paul Mooreafeb14b2007-12-21 14:58:11 -08001235extern int xfrm_replay_check(struct xfrm_state *x,
1236 struct sk_buff *skb, __be32 seq);
Al Viro61f46272006-09-27 18:48:33 -07001237extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001238extern void xfrm_replay_notify(struct xfrm_state *x, int event);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
Herbert Xu72cb6962005-06-20 13:18:08 -07001240extern int xfrm_init_state(struct xfrm_state *x);
Herbert Xu227620e2007-11-13 21:41:28 -08001241extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu716062f2007-11-13 21:44:23 -08001242extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1243 int encap_type);
Herbert Xu1bf06cd2007-11-19 18:50:17 -08001244extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
Herbert Xuc6581a42007-11-13 21:43:43 -08001245extern int xfrm_output_resume(struct sk_buff *skb, int err);
Herbert Xu406ef772007-10-08 17:16:30 -07001246extern int xfrm_output(struct sk_buff *skb);
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001247extern int xfrm4_extract_header(struct sk_buff *skb);
Herbert Xu227620e2007-11-13 21:41:28 -08001248extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xuc4541b42007-10-17 21:28:53 -07001249extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1250 int encap_type);
Herbert Xu716062f2007-11-13 21:44:23 -08001251extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252extern int xfrm4_rcv(struct sk_buff *skb);
Herbert Xuc4541b42007-10-17 21:28:53 -07001253
1254static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1255{
1256 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1257}
1258
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001259extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1260extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261extern int xfrm4_output(struct sk_buff *skb);
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -08001262extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1263extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001264extern int xfrm6_extract_header(struct sk_buff *skb);
Herbert Xu227620e2007-11-13 21:41:28 -08001265extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu33b5ecb2007-10-17 21:29:25 -07001266extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
Herbert Xu716062f2007-11-13 21:44:23 -08001267extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
Herbert Xue5bbef22007-10-15 12:50:28 -07001268extern int xfrm6_rcv(struct sk_buff *skb);
Masahide NAKAMURAfbd9a5b2006-08-23 18:08:21 -07001269extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1270 xfrm_address_t *saddr, u8 proto);
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -08001271extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1272extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
Al Viro8c689a62006-11-08 00:20:21 -08001273extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
Al Viro8c689a62006-11-08 00:20:21 -08001275extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001276extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1277extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278extern int xfrm6_output(struct sk_buff *skb);
Masahide NAKAMURAaee5adb2006-08-23 17:57:28 -07001279extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1280 u8 **prevhdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281
1282#ifdef CONFIG_XFRM
James Chapman067b2072007-07-05 17:08:05 -07001283extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285#else
1286static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1287{
1288 return -ENOPROTOOPT;
1289}
1290
James Chapman067b2072007-07-05 17:08:05 -07001291static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292{
1293 /* should not happen */
1294 kfree_skb(skb);
1295 return 0;
1296}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297#endif
1298
Al Virodd0fc662005-10-07 07:46:04 +01001299struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001300extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001302struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1303 struct xfrm_selector *sel,
Eric Parisef41aaa2007-03-07 15:37:58 -08001304 struct xfrm_sec_ctx *ctx, int delete,
1305 int *err);
1306struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
Joy Latten4aa2e622007-06-04 19:05:57 -04001307int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308u32 xfrm_get_acqseq(void);
Herbert Xu658b2192007-10-09 13:29:52 -07001309extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
Joy Latten161a09e2006-11-27 13:11:54 -06001310struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1311 xfrm_address_t *daddr, xfrm_address_t *saddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 int create, unsigned short family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
Venkat Yekkirala5b368e62006-10-05 15:42:18 -05001314extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1315 struct flowi *fl, int family, int strict);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001317#ifdef CONFIG_XFRM_MIGRATE
1318extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1319 struct xfrm_migrate *m, int num_bundles);
1320extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1321extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1322 struct xfrm_migrate *m);
1323extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1324 struct xfrm_migrate *m, int num_bundles);
1325#endif
1326
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327extern wait_queue_head_t km_waitq;
Al Viro5d36b182006-11-08 00:24:06 -08001328extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
Jamal Hadi Salim6c5c8ca2006-03-20 19:17:25 -08001329extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
Masahide NAKAMURA97a64b42006-08-23 20:44:06 -07001330extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331
1332extern void xfrm_input_init(void);
Al Viro6067b2b2006-09-27 18:47:59 -07001333extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334
1335extern void xfrm_probe_algs(void);
1336extern int xfrm_count_auth_supported(void);
1337extern int xfrm_count_enc_supported(void);
1338extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1339extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1340extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1341extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1342extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1343extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1344extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1345extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1346
Herbert Xu07d4ee52006-08-20 14:24:50 +10001347struct hash_desc;
Herbert Xu9409f382006-08-06 19:49:12 +10001348struct scatterlist;
Herbert Xu07d4ee52006-08-20 14:24:50 +10001349typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1350 unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351
Herbert Xu07d4ee52006-08-20 14:24:50 +10001352extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1353 int offset, int len, icv_update_fn_t icv_update);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354
1355static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1356 int family)
1357{
1358 switch (family) {
1359 default:
1360 case AF_INET:
Al Viro8c689a62006-11-08 00:20:21 -08001361 return (__force __u32)a->a4 - (__force __u32)b->a4;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 case AF_INET6:
1363 return ipv6_addr_cmp((struct in6_addr *)a,
1364 (struct in6_addr *)b);
1365 }
1366}
1367
Herbert Xu77d8d7a2005-10-05 12:15:12 -07001368static inline int xfrm_policy_id2dir(u32 index)
1369{
1370 return index & 7;
1371}
1372
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001373static inline int xfrm_aevent_is_on(void)
1374{
Patrick McHardybe336902006-03-20 22:40:54 -08001375 struct sock *nlsk;
1376 int ret = 0;
1377
1378 rcu_read_lock();
1379 nlsk = rcu_dereference(xfrm_nl);
1380 if (nlsk)
1381 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1382 rcu_read_unlock();
1383 return ret;
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001384}
1385
Eric Dumazet0f99be02008-01-08 23:39:06 -08001386static inline int xfrm_alg_len(struct xfrm_algo *alg)
1387{
1388 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1389}
1390
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001391#ifdef CONFIG_XFRM_MIGRATE
1392static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1393{
Eric Dumazet0f99be02008-01-08 23:39:06 -08001394 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001395}
1396
1397static inline void xfrm_states_put(struct xfrm_state **states, int n)
1398{
1399 int i;
1400 for (i = 0; i < n; i++)
1401 xfrm_state_put(*(states + i));
1402}
1403
1404static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1405{
1406 int i;
1407 for (i = 0; i < n; i++)
1408 xfrm_state_delete(*(states + i));
1409}
1410#endif
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001411
Herbert Xu00501122007-12-11 01:53:43 -08001412static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1413{
1414 return skb->sp->xvec[skb->sp->len - 1];
1415}
1416
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417#endif /* _NET_XFRM_H */