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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
Herbert Xu12a169e2008-10-01 07:03:24 -0700120struct xfrm_state_walk {
121 struct list_head all;
122 u8 state;
123 union {
124 u8 dying;
125 u8 proto;
126 };
127 u32 seq;
128};
129
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130/* Full description of state of transformer. */
131struct xfrm_state
132{
Herbert Xuabb81c42008-09-09 19:58:29 -0700133 union {
Herbert Xu12a169e2008-10-01 07:03:24 -0700134 struct hlist_node gclist;
Herbert Xuabb81c42008-09-09 19:58:29 -0700135 struct hlist_node bydst;
136 };
David S. Miller8f126e32006-08-24 02:45:07 -0700137 struct hlist_node bysrc;
138 struct hlist_node byspi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
140 atomic_t refcnt;
141 spinlock_t lock;
142
143 struct xfrm_id id;
144 struct xfrm_selector sel;
145
David S. Miller9d4a7062006-08-24 03:18:09 -0700146 u32 genid;
147
Herbert Xu12a169e2008-10-01 07:03:24 -0700148 /* Key manager bits */
149 struct xfrm_state_walk km;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
151 /* Parameters of this state. */
152 struct {
153 u32 reqid;
154 u8 mode;
155 u8 replay_window;
156 u8 aalgo, ealgo, calgo;
157 u8 flags;
158 u16 family;
159 xfrm_address_t saddr;
160 int header_len;
161 int trailer_len;
162 } props;
163
164 struct xfrm_lifetime_cfg lft;
165
166 /* Data for transformer */
167 struct xfrm_algo *aalg;
168 struct xfrm_algo *ealg;
169 struct xfrm_algo *calg;
Herbert Xu1a6509d2008-01-28 19:37:29 -0800170 struct xfrm_algo_aead *aead;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
172 /* Data for encapsulator */
173 struct xfrm_encap_tmpl *encap;
174
Noriaki TAKAMIYA060f02a2006-08-23 18:18:55 -0700175 /* Data for care-of address */
176 xfrm_address_t *coaddr;
177
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
179 struct xfrm_state *tunnel;
180
181 /* If a tunnel, number of users + 1 */
182 atomic_t tunnel_users;
183
184 /* State for replay detection */
185 struct xfrm_replay_state replay;
186
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800187 /* Replay detection state at the time we sent the last notification */
188 struct xfrm_replay_state preplay;
189
Jamal Hadi Salim27170962006-04-14 15:03:05 -0700190 /* internal flag that only holds state for delayed aevent at the
191 * moment
192 */
193 u32 xflags;
194
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800195 /* Replay detection notification settings */
196 u32 replay_maxage;
197 u32 replay_maxdiff;
198
199 /* Replay detection notification timer */
200 struct timer_list rtimer;
201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 /* Statistics */
203 struct xfrm_stats stats;
204
205 struct xfrm_lifetime_cur curlft;
206 struct timer_list timer;
207
Masahide NAKAMURA9afaca02006-08-23 18:20:16 -0700208 /* Last used time */
Herbert Xud26f3982007-11-13 21:47:08 -0800209 unsigned long lastused;
Masahide NAKAMURA9afaca02006-08-23 18:20:16 -0700210
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 /* Reference to data common to all the instances of this
212 * transformer. */
Eric Dumazet533cb5b2008-01-30 19:11:50 -0800213 const struct xfrm_type *type;
Herbert Xu13996372007-10-17 21:35:51 -0700214 struct xfrm_mode *inner_mode;
Kazunori MIYAZAWAdf9dcb42008-03-24 14:51:51 -0700215 struct xfrm_mode *inner_mode_iaf;
Herbert Xu13996372007-10-17 21:35:51 -0700216 struct xfrm_mode *outer_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Trent Jaegerdf718372005-12-13 23:12:27 -0800218 /* Security context */
219 struct xfrm_sec_ctx *security;
220
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 /* Private data of this transformer, format is opaque,
222 * interpreted by xfrm_type methods. */
223 void *data;
224};
225
Jamal Hadi Salim27170962006-04-14 15:03:05 -0700226/* xflags - make enum if more show up */
227#define XFRM_TIME_DEFER 1
228
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229enum {
230 XFRM_STATE_VOID,
231 XFRM_STATE_ACQ,
232 XFRM_STATE_VALID,
233 XFRM_STATE_ERROR,
234 XFRM_STATE_EXPIRED,
235 XFRM_STATE_DEAD
236};
237
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700238/* callback structure passed from either netlink or pfkey */
239struct km_event
240{
Herbert Xubf088672005-06-18 22:44:00 -0700241 union {
242 u32 hard;
243 u32 proto;
244 u32 byid;
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800245 u32 aevent;
Masahide NAKAMURAf7b69832006-08-23 22:49:28 -0700246 u32 type;
Herbert Xubf088672005-06-18 22:44:00 -0700247 } data;
248
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700249 u32 seq;
250 u32 pid;
251 u32 event;
252};
253
Herbert Xu25ee3282007-12-11 09:32:34 -0800254struct net_device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255struct xfrm_type;
256struct xfrm_dst;
257struct xfrm_policy_afinfo {
258 unsigned short family;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 struct dst_ops *dst_ops;
260 void (*garbage_collect)(void);
Herbert Xu66cdb3c2007-11-13 21:37:28 -0800261 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr,
262 xfrm_address_t *daddr);
Patrick McHardya1e59ab2006-09-19 12:57:34 -0700263 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 void (*decode_session)(struct sk_buff *skb,
Herbert Xud5422ef2007-12-12 10:44:16 -0800266 struct flowi *fl,
267 int reverse);
Herbert Xu25ee3282007-12-11 09:32:34 -0800268 int (*get_tos)(struct flowi *fl);
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -0800269 int (*init_path)(struct xfrm_dst *path,
270 struct dst_entry *dst,
271 int nfheader_len);
Herbert Xu25ee3282007-12-11 09:32:34 -0800272 int (*fill_dst)(struct xfrm_dst *xdst,
273 struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274};
275
276extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
277extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700278extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
279extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
281struct xfrm_tmpl;
Jamal Hadi Salim980ebd22006-03-20 19:16:40 -0800282extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
Jamal Hadi Salim53bc6b42006-03-20 19:17:03 -0800283extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
284extern int __xfrm_state_delete(struct xfrm_state *x);
285
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286struct xfrm_state_afinfo {
Herbert Xu17c2a422007-10-17 21:33:12 -0700287 unsigned int family;
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800288 unsigned int proto;
Al Viro8e3d7162008-03-17 22:49:16 -0700289 __be16 eth_proto;
Herbert Xu17c2a422007-10-17 21:33:12 -0700290 struct module *owner;
Eric Dumazet533cb5b2008-01-30 19:11:50 -0800291 const struct xfrm_type *type_map[IPPROTO_MAX];
Herbert Xuaa5d62c2007-10-17 21:31:12 -0700292 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
Herbert Xud094cd82005-06-20 13:19:41 -0700293 int (*init_flags)(struct xfrm_state *x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
295 struct xfrm_tmpl *tmpl,
296 xfrm_address_t *daddr, xfrm_address_t *saddr);
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -0700297 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
298 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
Miika Komucdca7262007-02-06 14:24:56 -0800299 int (*output)(struct sk_buff *skb);
Herbert Xu227620e2007-11-13 21:41:28 -0800300 int (*extract_input)(struct xfrm_state *x,
301 struct sk_buff *skb);
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800302 int (*extract_output)(struct xfrm_state *x,
303 struct sk_buff *skb);
Herbert Xu716062f2007-11-13 21:44:23 -0800304 int (*transport_finish)(struct sk_buff *skb,
305 int async);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306};
307
308extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
309extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
310
311extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
312
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313struct xfrm_type
314{
315 char *description;
316 struct module *owner;
317 __u8 proto;
Masahide NAKAMURA1b5c2292006-08-23 18:11:50 -0700318 __u8 flags;
319#define XFRM_TYPE_NON_FRAGMENT 1
Herbert Xu436a0a42007-10-08 17:25:53 -0700320#define XFRM_TYPE_REPLAY_PROT 2
Herbert Xuf04e7e82007-11-13 21:36:51 -0800321#define XFRM_TYPE_LOCAL_COADDR 4
322#define XFRM_TYPE_REMOTE_COADDR 8
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Herbert Xu72cb6962005-06-20 13:18:08 -0700324 int (*init_state)(struct xfrm_state *x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 void (*destructor)(struct xfrm_state *);
Herbert Xue6956332006-04-01 00:52:46 -0800326 int (*input)(struct xfrm_state *, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -0700328 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
Masahide NAKAMURAaee5adb2006-08-23 17:57:28 -0700329 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 /* Estimate maximal size of result of transformation of a dgram */
Patrick McHardyc5c25232007-04-09 11:47:18 -0700331 u32 (*get_mtu)(struct xfrm_state *, int size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332};
333
Eric Dumazet533cb5b2008-01-30 19:11:50 -0800334extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
335extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
Herbert Xub59f45d2006-05-27 23:05:54 -0700337struct xfrm_mode {
Herbert Xu227620e2007-11-13 21:41:28 -0800338 /*
339 * Remove encapsulation header.
340 *
341 * The IP header will be moved over the top of the encapsulation
342 * header.
343 *
344 * On entry, the transport header shall point to where the IP header
345 * should be and the network header shall be set to where the IP
346 * header currently is. skb->data shall point to the start of the
347 * payload.
348 */
349 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
350
351 /*
352 * This is the actual input entry point.
353 *
354 * For transport mode and equivalent this would be identical to
355 * input2 (which does not need to be set). While tunnel mode
356 * and equivalent would set this to the tunnel encapsulation function
357 * xfrm4_prepare_input that would in turn call input2.
358 */
Herbert Xub59f45d2006-05-27 23:05:54 -0700359 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu37fedd32007-10-10 15:44:44 -0700360
361 /*
362 * Add encapsulation header.
363 *
364 * On exit, the transport header will be set to the start of the
365 * encapsulation header to be filled in by x->type->output and
366 * the mac header will be set to the nextheader (protocol for
367 * IPv4) field of the extension header directly preceding the
368 * encapsulation header, or in its absence, that of the top IP
369 * header. The value of the network header will always point
370 * to the top IP header while skb->data will point to the payload.
371 */
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800372 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
373
374 /*
375 * This is the actual output entry point.
376 *
377 * For transport mode and equivalent this would be identical to
378 * output2 (which does not need to be set). While tunnel mode
379 * and equivalent would set this to a tunnel encapsulation function
380 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
381 * call output2.
382 */
383 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xub59f45d2006-05-27 23:05:54 -0700384
Herbert Xu17c2a422007-10-17 21:33:12 -0700385 struct xfrm_state_afinfo *afinfo;
Herbert Xub59f45d2006-05-27 23:05:54 -0700386 struct module *owner;
387 unsigned int encap;
Herbert Xu1bfcb102007-10-17 21:31:50 -0700388 int flags;
389};
390
391/* Flags for xfrm_mode. */
392enum {
393 XFRM_MODE_FLAG_TUNNEL = 1,
Herbert Xub59f45d2006-05-27 23:05:54 -0700394};
395
396extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
397extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
Herbert Xub59f45d2006-05-27 23:05:54 -0700398
Kazunori MIYAZAWAdf9dcb42008-03-24 14:51:51 -0700399static inline int xfrm_af2proto(unsigned int family)
400{
401 switch(family) {
402 case AF_INET:
403 return IPPROTO_IPIP;
404 case AF_INET6:
405 return IPPROTO_IPV6;
406 default:
407 return 0;
408 }
409}
410
411static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
412{
413 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
414 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
415 return x->inner_mode;
416 else
417 return x->inner_mode_iaf;
418}
419
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420struct xfrm_tmpl
421{
422/* id in template is interpreted as:
423 * daddr - destination of tunnel, may be zero for transport mode.
424 * spi - zero to acquire spi. Not zero if spi is static, then
425 * daddr must be fixed too.
426 * proto - AH/ESP/IPCOMP
427 */
428 struct xfrm_id id;
429
430/* Source address of tunnel. Ignored, if it is not a tunnel. */
431 xfrm_address_t saddr;
432
Miika Komu76b3f052006-11-30 16:40:43 -0800433 unsigned short encap_family;
434
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 __u32 reqid;
436
Masahide NAKAMURA7e49e6d2006-09-22 15:05:15 -0700437/* Mode: transport, tunnel etc. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 __u8 mode;
439
440/* Sharing mode: unique, this session only, this user only etc. */
441 __u8 share;
442
443/* May skip this transfomration if no SA is found */
444 __u8 optional;
445
Herbert Xuc5d18e92008-04-22 00:46:42 -0700446/* Skip aalgos/ealgos/calgos checks. */
447 __u8 allalgs;
448
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449/* Bit mask of algos allowed for acquisition */
450 __u32 aalgos;
451 __u32 ealgos;
452 __u32 calgos;
453};
454
Masahide NAKAMURA622dc822006-08-23 17:52:01 -0700455#define XFRM_MAX_DEPTH 6
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
Herbert Xu12a169e2008-10-01 07:03:24 -0700457struct xfrm_policy_walk_entry {
458 struct list_head all;
459 u8 dead;
460};
461
462struct xfrm_policy_walk {
463 struct xfrm_policy_walk_entry walk;
464 u8 type;
465 u32 seq;
466};
467
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468struct xfrm_policy
469{
470 struct xfrm_policy *next;
David S. Miller2518c7c2006-08-24 04:45:07 -0700471 struct hlist_node bydst;
472 struct hlist_node byidx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
474 /* This lock only affects elements except for entry. */
475 rwlock_t lock;
476 atomic_t refcnt;
477 struct timer_list timer;
478
479 u32 priority;
480 u32 index;
481 struct xfrm_selector selector;
482 struct xfrm_lifetime_cfg lft;
483 struct xfrm_lifetime_cur curlft;
484 struct dst_entry *bundles;
Herbert Xu12a169e2008-10-01 07:03:24 -0700485 struct xfrm_policy_walk_entry walk;
Arnaldo Carvalho de Melo46ca5f52006-11-27 17:58:59 -0200486 u8 type;
487 u8 action;
488 u8 flags;
Arnaldo Carvalho de Melo46ca5f52006-11-27 17:58:59 -0200489 u8 xfrm_nr;
Herbert Xu12a169e2008-10-01 07:03:24 -0700490 u16 family;
Trent Jaegerdf718372005-12-13 23:12:27 -0800491 struct xfrm_sec_ctx *security;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
493};
494
Arnaud Ebalard13c1d182008-10-05 13:33:42 -0700495struct xfrm_kmaddress {
496 xfrm_address_t local;
497 xfrm_address_t remote;
498 u32 reserved;
499 u16 family;
500};
501
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -0800502struct xfrm_migrate {
503 xfrm_address_t old_daddr;
504 xfrm_address_t old_saddr;
505 xfrm_address_t new_daddr;
506 xfrm_address_t new_saddr;
507 u8 proto;
508 u8 mode;
509 u16 reserved;
510 u32 reqid;
511 u16 old_family;
512 u16 new_family;
513};
514
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800515#define XFRM_KM_TIMEOUT 30
516/* which seqno */
517#define XFRM_REPLAY_SEQ 1
518#define XFRM_REPLAY_OSEQ 2
519#define XFRM_REPLAY_SEQ_MASK 3
520/* what happened */
521#define XFRM_REPLAY_UPDATE XFRM_AE_CR
522#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
523
524/* default aevent timeout in units of 100ms */
525#define XFRM_AE_ETIME 10
526/* Async Event timer multiplier */
527#define XFRM_AE_ETH_M 10
528/* default seq threshold size */
529#define XFRM_AE_SEQT_SIZE 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
531struct xfrm_mgr
532{
533 struct list_head list;
534 char *id;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700535 int (*notify)(struct xfrm_state *x, struct km_event *c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
Venkat Yekkiralacb969f02006-07-24 23:32:20 -0700537 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
Al Viro5d36b182006-11-08 00:24:06 -0800538 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700539 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
Masahide NAKAMURA97a64b42006-08-23 20:44:06 -0700540 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
Arnaud Ebalard13c1d182008-10-05 13:33:42 -0700541 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542};
543
544extern int xfrm_register_km(struct xfrm_mgr *km);
545extern int xfrm_unregister_km(struct xfrm_mgr *km);
546
David S. Miller2518c7c2006-08-24 04:45:07 -0700547extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548
Herbert Xu436a0a42007-10-08 17:25:53 -0700549/*
550 * This structure is used for the duration where packets are being
551 * transformed by IPsec. As soon as the packet leaves IPsec the
552 * area beyond the generic IP part may be overwritten.
553 */
554struct xfrm_skb_cb {
555 union {
556 struct inet_skb_parm h4;
557 struct inet6_skb_parm h6;
558 } header;
559
560 /* Sequence number for replay protection. */
Herbert Xub318e0e2008-02-12 22:50:35 -0800561 union {
562 u64 output;
563 __be32 input;
564 } seq;
Herbert Xu436a0a42007-10-08 17:25:53 -0700565};
566
567#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
568
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800569/*
570 * This structure is used by the afinfo prepare_input/prepare_output functions
571 * to transmit header information to the mode input/output functions.
572 */
573struct xfrm_mode_skb_cb {
574 union {
575 struct inet_skb_parm h4;
576 struct inet6_skb_parm h6;
577 } header;
578
579 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
580 __be16 id;
581 __be16 frag_off;
582
Herbert Xu732c8bd2008-03-26 16:51:09 -0700583 /* IP header length (excluding options or extension headers). */
584 u8 ihl;
585
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800586 /* TOS for IPv4, class for IPv6. */
587 u8 tos;
588
589 /* TTL for IPv4, hop limitfor IPv6. */
590 u8 ttl;
591
592 /* Protocol for IPv4, NH for IPv6. */
593 u8 protocol;
594
Herbert Xu732c8bd2008-03-26 16:51:09 -0700595 /* Option length for IPv4, zero for IPv6. */
596 u8 optlen;
597
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800598 /* Used by IPv6 only, zero for IPv4. */
599 u8 flow_lbl[3];
600};
601
602#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
603
Herbert Xu716062f2007-11-13 21:44:23 -0800604/*
605 * This structure is used by the input processing to locate the SPI and
606 * related information.
607 */
608struct xfrm_spi_skb_cb {
609 union {
610 struct inet_skb_parm h4;
611 struct inet6_skb_parm h6;
612 } header;
613
Herbert Xu716062f2007-11-13 21:44:23 -0800614 unsigned int daddroff;
Herbert Xu2fcb45b2007-12-03 22:54:12 -0800615 unsigned int family;
Herbert Xu716062f2007-11-13 21:44:23 -0800616};
617
618#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
619
Joy Latten161a09e2006-11-27 13:11:54 -0600620/* Audit Information */
621struct xfrm_audit
622{
Joy Latten161a09e2006-11-27 13:11:54 -0600623 u32 secid;
Eric Paris25323862008-04-18 10:09:25 -0400624 uid_t loginuid;
625 u32 sessionid;
Joy Latten161a09e2006-11-27 13:11:54 -0600626};
Joy Lattenc9204d92006-11-30 15:50:43 -0600627
628#ifdef CONFIG_AUDITSYSCALL
Paul Mooreafeb14b2007-12-21 14:58:11 -0800629static inline struct audit_buffer *xfrm_audit_start(const char *op)
Joy Lattenab5f5e82007-09-17 11:51:22 -0700630{
631 struct audit_buffer *audit_buf = NULL;
Paul Mooreafeb14b2007-12-21 14:58:11 -0800632
633 if (audit_enabled == 0)
634 return NULL;
635 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
636 AUDIT_MAC_IPSEC_EVENT);
637 if (audit_buf == NULL)
638 return NULL;
639 audit_log_format(audit_buf, "op=%s", op);
640 return audit_buf;
641}
642
Eric Paris25323862008-04-18 10:09:25 -0400643static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
Paul Mooreafeb14b2007-12-21 14:58:11 -0800644 struct audit_buffer *audit_buf)
645{
Joy Lattenab5f5e82007-09-17 11:51:22 -0700646 char *secctx;
647 u32 secctx_len;
648
Eric Paris25323862008-04-18 10:09:25 -0400649 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
Paul Moore68277ac2007-12-20 20:49:33 -0800650 if (secid != 0 &&
651 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
Joy Lattenab5f5e82007-09-17 11:51:22 -0700652 audit_log_format(audit_buf, " subj=%s", secctx);
653 security_release_secctx(secctx, secctx_len);
654 } else
655 audit_log_task_context(audit_buf);
Joy Lattenab5f5e82007-09-17 11:51:22 -0700656}
657
658extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
Eric Paris25323862008-04-18 10:09:25 -0400659 u32 auid, u32 ses, u32 secid);
Joy Lattenab5f5e82007-09-17 11:51:22 -0700660extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
Eric Paris25323862008-04-18 10:09:25 -0400661 u32 auid, u32 ses, u32 secid);
Joy Lattenab5f5e82007-09-17 11:51:22 -0700662extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
Eric Paris25323862008-04-18 10:09:25 -0400663 u32 auid, u32 ses, u32 secid);
Joy Lattenab5f5e82007-09-17 11:51:22 -0700664extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
Eric Paris25323862008-04-18 10:09:25 -0400665 u32 auid, u32 ses, u32 secid);
Paul Mooreafeb14b2007-12-21 14:58:11 -0800666extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
667 struct sk_buff *skb);
668extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
669extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
670 __be32 net_spi, __be32 net_seq);
671extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
672 struct sk_buff *skb, u8 proto);
Joy Lattenc9204d92006-11-30 15:50:43 -0600673#else
Marcin Slusarz41fef0e2008-05-03 21:03:01 -0700674
675static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
676 u32 auid, u32 ses, u32 secid)
677{
678}
679
680static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
681 u32 auid, u32 ses, u32 secid)
682{
683}
684
685static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
686 u32 auid, u32 ses, u32 secid)
687{
688}
689
690static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
691 u32 auid, u32 ses, u32 secid)
692{
693}
694
695static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
696 struct sk_buff *skb)
697{
698}
699
700static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
701 u16 family)
702{
703}
704
705static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
706 __be32 net_spi, __be32 net_seq)
707{
708}
709
710static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
711 struct sk_buff *skb, u8 proto)
712{
713}
Joy Lattenc9204d92006-11-30 15:50:43 -0600714#endif /* CONFIG_AUDITSYSCALL */
Joy Latten161a09e2006-11-27 13:11:54 -0600715
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716static inline void xfrm_pol_hold(struct xfrm_policy *policy)
717{
718 if (likely(policy != NULL))
719 atomic_inc(&policy->refcnt);
720}
721
WANG Cong64c31b32008-01-07 22:34:29 -0800722extern void xfrm_policy_destroy(struct xfrm_policy *policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723
724static inline void xfrm_pol_put(struct xfrm_policy *policy)
725{
726 if (atomic_dec_and_test(&policy->refcnt))
WANG Cong64c31b32008-01-07 22:34:29 -0800727 xfrm_policy_destroy(policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728}
729
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700730#ifdef CONFIG_XFRM_SUB_POLICY
731static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
732{
733 int i;
734 for (i = npols - 1; i >= 0; --i)
735 xfrm_pol_put(pols[i]);
736}
737#else
738static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
739{
740 xfrm_pol_put(pols[0]);
741}
742#endif
743
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744extern void __xfrm_state_destroy(struct xfrm_state *);
745
Herbert Xu21380b82006-02-22 14:47:13 -0800746static inline void __xfrm_state_put(struct xfrm_state *x)
747{
748 atomic_dec(&x->refcnt);
749}
750
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751static inline void xfrm_state_put(struct xfrm_state *x)
752{
753 if (atomic_dec_and_test(&x->refcnt))
754 __xfrm_state_destroy(x);
755}
756
757static inline void xfrm_state_hold(struct xfrm_state *x)
758{
759 atomic_inc(&x->refcnt);
760}
761
762static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
763{
Al Viro5f193432006-09-27 18:46:32 -0700764 __be32 *a1 = token1;
765 __be32 *a2 = token2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 int pdw;
767 int pbi;
768
769 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
770 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
771
772 if (pdw)
773 if (memcmp(a1, a2, pdw << 2))
774 return 0;
775
776 if (pbi) {
Al Viro5f193432006-09-27 18:46:32 -0700777 __be32 mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778
779 mask = htonl((0xffffffff) << (32 - pbi));
780
781 if ((a1[pdw] ^ a2[pdw]) & mask)
782 return 0;
783 }
784
785 return 1;
786}
787
788static __inline__
Al Virof9d07e41f82006-09-27 18:45:50 -0700789__be16 xfrm_flowi_sport(struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790{
Al Virof9d07e41f82006-09-27 18:45:50 -0700791 __be16 port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 switch(fl->proto) {
793 case IPPROTO_TCP:
794 case IPPROTO_UDP:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800795 case IPPROTO_UDPLITE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 case IPPROTO_SCTP:
797 port = fl->fl_ip_sport;
798 break;
799 case IPPROTO_ICMP:
800 case IPPROTO_ICMPV6:
801 port = htons(fl->fl_icmp_type);
802 break;
Masahide NAKAMURA2ce42722006-08-23 20:39:03 -0700803 case IPPROTO_MH:
804 port = htons(fl->fl_mh_type);
805 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 default:
807 port = 0; /*XXX*/
808 }
809 return port;
810}
811
812static __inline__
Al Virof9d07e41f82006-09-27 18:45:50 -0700813__be16 xfrm_flowi_dport(struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814{
Al Virof9d07e41f82006-09-27 18:45:50 -0700815 __be16 port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 switch(fl->proto) {
817 case IPPROTO_TCP:
818 case IPPROTO_UDP:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800819 case IPPROTO_UDPLITE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 case IPPROTO_SCTP:
821 port = fl->fl_ip_dport;
822 break;
823 case IPPROTO_ICMP:
824 case IPPROTO_ICMPV6:
825 port = htons(fl->fl_icmp_code);
826 break;
827 default:
828 port = 0; /*XXX*/
829 }
830 return port;
831}
832
Andrew Morton77681022006-11-08 22:46:26 -0800833extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
834 unsigned short family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835
Trent Jaegerdf718372005-12-13 23:12:27 -0800836#ifdef CONFIG_SECURITY_NETWORK_XFRM
837/* If neither has a context --> match
838 * Otherwise, both must have a context and the sids, doi, alg must match
839 */
840static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
841{
842 return ((!s1 && !s2) ||
843 (s1 && s2 &&
844 (s1->ctx_sid == s2->ctx_sid) &&
845 (s1->ctx_doi == s2->ctx_doi) &&
846 (s1->ctx_alg == s2->ctx_alg)));
847}
848#else
849static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
850{
851 return 1;
852}
853#endif
854
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855/* A struct encoding bundle of transformations to apply to some set of flow.
856 *
857 * dst->child points to the next element of bundle.
858 * dst->xfrm points to an instanse of transformer.
859 *
860 * Due to unfortunate limitations of current routing cache, which we
861 * have no time to fix, it mirrors struct rtable and bound to the same
862 * routing key, including saddr,daddr. However, we can have many of
863 * bundles differing by session id. All the bundles grow from a parent
864 * policy rule.
865 */
866struct xfrm_dst
867{
868 union {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 struct dst_entry dst;
870 struct rtable rt;
871 struct rt6_info rt6;
872 } u;
873 struct dst_entry *route;
Masahide NAKAMURA157bfc22007-04-30 00:33:35 -0700874#ifdef CONFIG_XFRM_SUB_POLICY
875 struct flowi *origin;
876 struct xfrm_selector *partner;
877#endif
David S. Miller9d4a7062006-08-24 03:18:09 -0700878 u32 genid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 u32 route_mtu_cached;
880 u32 child_mtu_cached;
Hideaki YOSHIFUJI92d63de2005-05-26 12:58:04 -0700881 u32 route_cookie;
882 u32 path_cookie;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883};
884
Alexey Dobriyandef8b4f2008-10-28 13:24:06 -0700885#ifdef CONFIG_XFRM
Herbert Xuaabc9762005-05-03 16:27:10 -0700886static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
887{
888 dst_release(xdst->route);
889 if (likely(xdst->u.dst.xfrm))
890 xfrm_state_put(xdst->u.dst.xfrm);
Masahide NAKAMURA157bfc22007-04-30 00:33:35 -0700891#ifdef CONFIG_XFRM_SUB_POLICY
892 kfree(xdst->origin);
893 xdst->origin = NULL;
894 kfree(xdst->partner);
895 xdst->partner = NULL;
896#endif
Herbert Xuaabc9762005-05-03 16:27:10 -0700897}
Alexey Dobriyandef8b4f2008-10-28 13:24:06 -0700898#endif
Herbert Xuaabc9762005-05-03 16:27:10 -0700899
900extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
901
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902struct sec_path
903{
904 atomic_t refcnt;
905 int len;
Herbert Xudbe5b4a2006-04-01 00:54:16 -0800906 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907};
908
909static inline struct sec_path *
910secpath_get(struct sec_path *sp)
911{
912 if (sp)
913 atomic_inc(&sp->refcnt);
914 return sp;
915}
916
917extern void __secpath_destroy(struct sec_path *sp);
918
919static inline void
920secpath_put(struct sec_path *sp)
921{
922 if (sp && atomic_dec_and_test(&sp->refcnt))
923 __secpath_destroy(sp);
924}
925
926extern struct sec_path *secpath_dup(struct sec_path *src);
927
928static inline void
929secpath_reset(struct sk_buff *skb)
930{
931#ifdef CONFIG_XFRM
932 secpath_put(skb->sp);
933 skb->sp = NULL;
934#endif
935}
936
937static inline int
Patrick McHardya1e59ab2006-09-19 12:57:34 -0700938xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
939{
940 switch (family) {
941 case AF_INET:
942 return addr->a4 == 0;
943 case AF_INET6:
944 return ipv6_addr_any((struct in6_addr *)&addr->a6);
945 }
946 return 0;
947}
948
949static inline int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950__xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
951{
952 return (tmpl->saddr.a4 &&
953 tmpl->saddr.a4 != x->props.saddr.a4);
954}
955
956static inline int
957__xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
958{
959 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
960 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
961}
962
963static inline int
964xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
965{
966 switch (family) {
967 case AF_INET:
968 return __xfrm4_state_addr_cmp(tmpl, x);
969 case AF_INET6:
970 return __xfrm6_state_addr_cmp(tmpl, x);
971 }
972 return !0;
973}
974
975#ifdef CONFIG_XFRM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
977
Herbert Xud5422ef2007-12-12 10:44:16 -0800978static inline int __xfrm_policy_check2(struct sock *sk, int dir,
979 struct sk_buff *skb,
980 unsigned int family, int reverse)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981{
Herbert Xud5422ef2007-12-12 10:44:16 -0800982 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
983
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 if (sk && sk->sk_policy[XFRM_POLICY_IN])
Herbert Xud5422ef2007-12-12 10:44:16 -0800985 return __xfrm_policy_check(sk, ndir, skb, family);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700986
David S. Miller2518c7c2006-08-24 04:45:07 -0700987 return (!xfrm_policy_count[dir] && !skb->sp) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 (skb->dst->flags & DST_NOPOLICY) ||
Herbert Xud5422ef2007-12-12 10:44:16 -0800989 __xfrm_policy_check(sk, ndir, skb, family);
990}
991
992static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
993{
994 return __xfrm_policy_check2(sk, dir, skb, family, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995}
996
997static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
998{
999 return xfrm_policy_check(sk, dir, skb, AF_INET);
1000}
1001
1002static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1003{
1004 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1005}
1006
Herbert Xud5422ef2007-12-12 10:44:16 -08001007static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1008 struct sk_buff *skb)
1009{
1010 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1011}
1012
1013static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1014 struct sk_buff *skb)
1015{
1016 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1017}
1018
1019extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1020 unsigned int family, int reverse);
1021
1022static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1023 unsigned int family)
1024{
1025 return __xfrm_decode_session(skb, fl, family, 0);
1026}
1027
1028static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1029 struct flowi *fl,
1030 unsigned int family)
1031{
1032 return __xfrm_decode_session(skb, fl, family, 1);
1033}
1034
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1036
1037static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1038{
David S. Miller2518c7c2006-08-24 04:45:07 -07001039 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 (skb->dst->flags & DST_NOXFRM) ||
1041 __xfrm_route_forward(skb, family);
1042}
1043
1044static inline int xfrm4_route_forward(struct sk_buff *skb)
1045{
1046 return xfrm_route_forward(skb, AF_INET);
1047}
1048
1049static inline int xfrm6_route_forward(struct sk_buff *skb)
1050{
1051 return xfrm_route_forward(skb, AF_INET6);
1052}
1053
1054extern int __xfrm_sk_clone_policy(struct sock *sk);
1055
1056static inline int xfrm_sk_clone_policy(struct sock *sk)
1057{
1058 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1059 return __xfrm_sk_clone_policy(sk);
1060 return 0;
1061}
1062
Herbert Xu4666faa2005-06-18 22:43:22 -07001063extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064
1065static inline void xfrm_sk_free_policy(struct sock *sk)
1066{
1067 if (unlikely(sk->sk_policy[0] != NULL)) {
1068 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1069 sk->sk_policy[0] = NULL;
1070 }
1071 if (unlikely(sk->sk_policy[1] != NULL)) {
1072 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1073 sk->sk_policy[1] = NULL;
1074 }
1075}
1076
1077#else
1078
1079static inline void xfrm_sk_free_policy(struct sock *sk) {}
1080static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1081static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1082static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1083static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1084{
1085 return 1;
1086}
1087static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1088{
1089 return 1;
1090}
1091static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1092{
1093 return 1;
1094}
Herbert Xud5422ef2007-12-12 10:44:16 -08001095static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1096 struct flowi *fl,
1097 unsigned int family)
1098{
1099 return -ENOSYS;
1100}
1101static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1102 struct sk_buff *skb)
1103{
1104 return 1;
1105}
1106static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1107 struct sk_buff *skb)
1108{
1109 return 1;
1110}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111#endif
1112
1113static __inline__
1114xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1115{
1116 switch (family){
1117 case AF_INET:
1118 return (xfrm_address_t *)&fl->fl4_dst;
1119 case AF_INET6:
1120 return (xfrm_address_t *)&fl->fl6_dst;
1121 }
1122 return NULL;
1123}
1124
1125static __inline__
1126xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1127{
1128 switch (family){
1129 case AF_INET:
1130 return (xfrm_address_t *)&fl->fl4_src;
1131 case AF_INET6:
1132 return (xfrm_address_t *)&fl->fl6_src;
1133 }
1134 return NULL;
1135}
1136
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +09001137static __inline__
1138void xfrm_flowi_addr_get(struct flowi *fl,
1139 xfrm_address_t *saddr, xfrm_address_t *daddr,
1140 unsigned short family)
1141{
1142 switch(family) {
1143 case AF_INET:
1144 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1145 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1146 break;
1147 case AF_INET6:
1148 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1149 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1150 break;
1151 }
1152}
1153
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154static __inline__ int
1155__xfrm4_state_addr_check(struct xfrm_state *x,
1156 xfrm_address_t *daddr, xfrm_address_t *saddr)
1157{
1158 if (daddr->a4 == x->id.daddr.a4 &&
1159 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1160 return 1;
1161 return 0;
1162}
1163
1164static __inline__ int
1165__xfrm6_state_addr_check(struct xfrm_state *x,
1166 xfrm_address_t *daddr, xfrm_address_t *saddr)
1167{
1168 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1169 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1170 ipv6_addr_any((struct in6_addr *)saddr) ||
1171 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1172 return 1;
1173 return 0;
1174}
1175
1176static __inline__ int
1177xfrm_state_addr_check(struct xfrm_state *x,
1178 xfrm_address_t *daddr, xfrm_address_t *saddr,
1179 unsigned short family)
1180{
1181 switch (family) {
1182 case AF_INET:
1183 return __xfrm4_state_addr_check(x, daddr, saddr);
1184 case AF_INET6:
1185 return __xfrm6_state_addr_check(x, daddr, saddr);
1186 }
1187 return 0;
1188}
1189
Masahide NAKAMURAe53820d2006-08-23 19:12:01 -07001190static __inline__ int
1191xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1192 unsigned short family)
1193{
1194 switch (family) {
1195 case AF_INET:
1196 return __xfrm4_state_addr_check(x,
1197 (xfrm_address_t *)&fl->fl4_dst,
1198 (xfrm_address_t *)&fl->fl4_src);
1199 case AF_INET6:
1200 return __xfrm6_state_addr_check(x,
1201 (xfrm_address_t *)&fl->fl6_dst,
1202 (xfrm_address_t *)&fl->fl6_src);
1203 }
1204 return 0;
1205}
1206
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207static inline int xfrm_state_kern(struct xfrm_state *x)
1208{
1209 return atomic_read(&x->tunnel_users);
1210}
1211
Masahide NAKAMURA57947082006-09-22 15:06:24 -07001212static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1213{
Masahide NAKAMURAdc00a522006-08-23 17:49:52 -07001214 return (!userproto || proto == userproto ||
1215 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1216 proto == IPPROTO_ESP ||
1217 proto == IPPROTO_COMP)));
Masahide NAKAMURA57947082006-09-22 15:06:24 -07001218}
1219
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220/*
1221 * xfrm algorithm information
1222 */
Herbert Xu1a6509d2008-01-28 19:37:29 -08001223struct xfrm_algo_aead_info {
1224 u16 icv_truncbits;
1225};
1226
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227struct xfrm_algo_auth_info {
1228 u16 icv_truncbits;
1229 u16 icv_fullbits;
1230};
1231
1232struct xfrm_algo_encr_info {
1233 u16 blockbits;
1234 u16 defkeybits;
1235};
1236
1237struct xfrm_algo_comp_info {
1238 u16 threshold;
1239};
1240
1241struct xfrm_algo_desc {
1242 char *name;
Herbert Xu04ff1262006-08-13 08:50:00 +10001243 char *compat;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 u8 available:1;
1245 union {
Herbert Xu1a6509d2008-01-28 19:37:29 -08001246 struct xfrm_algo_aead_info aead;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 struct xfrm_algo_auth_info auth;
1248 struct xfrm_algo_encr_info encr;
1249 struct xfrm_algo_comp_info comp;
1250 } uinfo;
1251 struct sadb_alg desc;
1252};
1253
1254/* XFRM tunnel handlers. */
1255struct xfrm_tunnel {
1256 int (*handler)(struct sk_buff *skb);
Herbert Xud2acc342006-03-28 01:12:13 -08001257 int (*err_handler)(struct sk_buff *skb, __u32 info);
1258
1259 struct xfrm_tunnel *next;
1260 int priority;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261};
1262
1263struct xfrm6_tunnel {
Herbert Xud2acc342006-03-28 01:12:13 -08001264 int (*handler)(struct sk_buff *skb);
1265 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
Al Viro04ce6902006-11-08 00:21:01 -08001266 int type, int code, int offset, __be32 info);
Herbert Xud2acc342006-03-28 01:12:13 -08001267 struct xfrm6_tunnel *next;
1268 int priority;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269};
1270
1271extern void xfrm_init(void);
1272extern void xfrm4_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273extern void xfrm_state_init(void);
1274extern void xfrm4_state_init(void);
Daniel Lezcanoc35b7e72007-12-08 00:14:11 -08001275#ifdef CONFIG_XFRM
1276extern int xfrm6_init(void);
1277extern void xfrm6_fini(void);
Daniel Lezcano0013cab2007-12-07 00:42:11 -08001278extern int xfrm6_state_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279extern void xfrm6_state_fini(void);
Daniel Lezcanoc35b7e72007-12-08 00:14:11 -08001280#else
1281static inline int xfrm6_init(void)
1282{
1283 return 0;
1284}
1285static inline void xfrm6_fini(void)
1286{
1287 ;
1288}
1289#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08001291#ifdef CONFIG_XFRM_STATISTICS
1292extern int xfrm_proc_init(void);
1293#endif
1294
Herbert Xu5c182452008-09-22 19:48:19 -07001295extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
Timo Teras4c563f72008-02-28 21:31:08 -08001296extern int xfrm_state_walk(struct xfrm_state_walk *walk,
1297 int (*func)(struct xfrm_state *, int, void*), void *);
Herbert Xuabb81c42008-09-09 19:58:29 -07001298extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299extern struct xfrm_state *xfrm_state_alloc(void);
1300extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1301 struct flowi *fl, struct xfrm_tmpl *tmpl,
1302 struct xfrm_policy *pol, int *err,
1303 unsigned short family);
Jamal Hadi Salim628529b2007-07-02 22:41:14 -07001304extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1305 xfrm_address_t *saddr,
1306 unsigned short family,
1307 u8 mode, u8 proto, u32 reqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308extern int xfrm_state_check_expire(struct xfrm_state *x);
1309extern void xfrm_state_insert(struct xfrm_state *x);
1310extern int xfrm_state_add(struct xfrm_state *x);
1311extern int xfrm_state_update(struct xfrm_state *x);
Al Viroa94cfd12006-09-27 18:47:24 -07001312extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
Masahide NAKAMURAeb2971b2006-08-23 17:56:04 -07001313extern 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 -07001314#ifdef CONFIG_XFRM_SUB_POLICY
1315extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1316 int n, unsigned short family);
1317extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1318 int n, unsigned short family);
1319#else
1320static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1321 int n, unsigned short family)
1322{
1323 return -ENOSYS;
1324}
1325
1326static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1327 int n, unsigned short family)
1328{
1329 return -ENOSYS;
1330}
1331#endif
Jamal Hadi Salimaf11e312007-05-04 12:55:13 -07001332
1333struct xfrmk_sadinfo {
1334 u32 sadhcnt; /* current hash bkts */
1335 u32 sadhmcnt; /* max allowed hash bkts */
1336 u32 sadcnt; /* current running count */
1337};
1338
Jamal Hadi Salim5a6d3412007-05-04 12:55:39 -07001339struct xfrmk_spdinfo {
1340 u32 incnt;
1341 u32 outcnt;
1342 u32 fwdcnt;
1343 u32 inscnt;
1344 u32 outscnt;
1345 u32 fwdscnt;
1346 u32 spdhcnt;
1347 u32 spdhmcnt;
1348};
1349
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -07001351extern int xfrm_state_delete(struct xfrm_state *x);
Joy Latten4aa2e622007-06-04 19:05:57 -04001352extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
Jamal Hadi Salimaf11e312007-05-04 12:55:13 -07001353extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
Jamal Hadi Salim5a6d3412007-05-04 12:55:39 -07001354extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
Paul Mooreafeb14b2007-12-21 14:58:11 -08001355extern int xfrm_replay_check(struct xfrm_state *x,
1356 struct sk_buff *skb, __be32 seq);
Al Viro61f46272006-09-27 18:48:33 -07001357extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001358extern void xfrm_replay_notify(struct xfrm_state *x, int event);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
Herbert Xu72cb6962005-06-20 13:18:08 -07001360extern int xfrm_init_state(struct xfrm_state *x);
Herbert Xu227620e2007-11-13 21:41:28 -08001361extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu716062f2007-11-13 21:44:23 -08001362extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1363 int encap_type);
Herbert Xu1bf06cd2007-11-19 18:50:17 -08001364extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
Herbert Xuc6581a42007-11-13 21:43:43 -08001365extern int xfrm_output_resume(struct sk_buff *skb, int err);
Herbert Xu406ef772007-10-08 17:16:30 -07001366extern int xfrm_output(struct sk_buff *skb);
Kazunori MIYAZAWAdf9dcb42008-03-24 14:51:51 -07001367extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001368extern int xfrm4_extract_header(struct sk_buff *skb);
Herbert Xu227620e2007-11-13 21:41:28 -08001369extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xuc4541b42007-10-17 21:28:53 -07001370extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1371 int encap_type);
Herbert Xu716062f2007-11-13 21:44:23 -08001372extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373extern int xfrm4_rcv(struct sk_buff *skb);
Herbert Xuc4541b42007-10-17 21:28:53 -07001374
1375static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1376{
1377 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1378}
1379
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001380extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1381extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382extern int xfrm4_output(struct sk_buff *skb);
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -08001383extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1384extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001385extern int xfrm6_extract_header(struct sk_buff *skb);
Herbert Xu227620e2007-11-13 21:41:28 -08001386extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu33b5ecb2007-10-17 21:29:25 -07001387extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
Herbert Xu716062f2007-11-13 21:44:23 -08001388extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
Herbert Xue5bbef22007-10-15 12:50:28 -07001389extern int xfrm6_rcv(struct sk_buff *skb);
Masahide NAKAMURAfbd9a5b2006-08-23 18:08:21 -07001390extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1391 xfrm_address_t *saddr, u8 proto);
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -08001392extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1393extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
Al Viro8c689a62006-11-08 00:20:21 -08001394extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
Al Viro8c689a62006-11-08 00:20:21 -08001396extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001397extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1398extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399extern int xfrm6_output(struct sk_buff *skb);
Masahide NAKAMURAaee5adb2006-08-23 17:57:28 -07001400extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1401 u8 **prevhdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402
1403#ifdef CONFIG_XFRM
James Chapman067b2072007-07-05 17:08:05 -07001404extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406#else
1407static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1408{
1409 return -ENOPROTOOPT;
1410}
1411
James Chapman067b2072007-07-05 17:08:05 -07001412static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413{
1414 /* should not happen */
1415 kfree_skb(skb);
1416 return 0;
1417}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418#endif
1419
Al Virodd0fc662005-10-07 07:46:04 +01001420struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
Timo Teras4c563f72008-02-28 21:31:08 -08001421
Herbert Xu12a169e2008-10-01 07:03:24 -07001422extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
Timo Teras4c563f72008-02-28 21:31:08 -08001423extern int xfrm_policy_walk(struct xfrm_policy_walk *walk,
1424 int (*func)(struct xfrm_policy *, int, int, void*), void *);
Herbert Xu12a169e2008-10-01 07:03:24 -07001425extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001427struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1428 struct xfrm_selector *sel,
Eric Parisef41aaa2007-03-07 15:37:58 -08001429 struct xfrm_sec_ctx *ctx, int delete,
1430 int *err);
1431struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
Joy Latten4aa2e622007-06-04 19:05:57 -04001432int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433u32 xfrm_get_acqseq(void);
Herbert Xu658b2192007-10-09 13:29:52 -07001434extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
Joy Latten161a09e2006-11-27 13:11:54 -06001435struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1436 xfrm_address_t *daddr, xfrm_address_t *saddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437 int create, unsigned short family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
Venkat Yekkirala5b368e62006-10-05 15:42:18 -05001439extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1440 struct flowi *fl, int family, int strict);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001442#ifdef CONFIG_XFRM_MIGRATE
1443extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
Arnaud Ebalard13c1d182008-10-05 13:33:42 -07001444 struct xfrm_migrate *m, int num_bundles,
1445 struct xfrm_kmaddress *k);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001446extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1447extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1448 struct xfrm_migrate *m);
1449extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
Arnaud Ebalard13c1d182008-10-05 13:33:42 -07001450 struct xfrm_migrate *m, int num_bundles,
1451 struct xfrm_kmaddress *k);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001452#endif
1453
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454extern wait_queue_head_t km_waitq;
Al Viro5d36b182006-11-08 00:24:06 -08001455extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
Jamal Hadi Salim6c5c8ca2006-03-20 19:17:25 -08001456extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
Masahide NAKAMURA97a64b42006-08-23 20:44:06 -07001457extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458
1459extern void xfrm_input_init(void);
Al Viro6067b2b2006-09-27 18:47:59 -07001460extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461
1462extern void xfrm_probe_algs(void);
1463extern int xfrm_count_auth_supported(void);
1464extern int xfrm_count_enc_supported(void);
1465extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1466extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1467extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1468extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1469extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1470extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1471extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1472extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
Herbert Xu1a6509d2008-01-28 19:37:29 -08001473extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1474 int probe);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475
Herbert Xu07d4ee52006-08-20 14:24:50 +10001476struct hash_desc;
Herbert Xu9409f382006-08-06 19:49:12 +10001477struct scatterlist;
Herbert Xu07d4ee52006-08-20 14:24:50 +10001478typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1479 unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480
Herbert Xu07d4ee52006-08-20 14:24:50 +10001481extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1482 int offset, int len, icv_update_fn_t icv_update);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483
1484static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1485 int family)
1486{
1487 switch (family) {
1488 default:
1489 case AF_INET:
Al Viro8c689a62006-11-08 00:20:21 -08001490 return (__force __u32)a->a4 - (__force __u32)b->a4;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491 case AF_INET6:
1492 return ipv6_addr_cmp((struct in6_addr *)a,
1493 (struct in6_addr *)b);
1494 }
1495}
1496
Herbert Xu77d8d7a2005-10-05 12:15:12 -07001497static inline int xfrm_policy_id2dir(u32 index)
1498{
1499 return index & 7;
1500}
1501
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001502static inline int xfrm_aevent_is_on(void)
1503{
Patrick McHardybe336902006-03-20 22:40:54 -08001504 struct sock *nlsk;
1505 int ret = 0;
1506
1507 rcu_read_lock();
1508 nlsk = rcu_dereference(xfrm_nl);
1509 if (nlsk)
1510 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1511 rcu_read_unlock();
1512 return ret;
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001513}
1514
Eric Dumazet0f99be02008-01-08 23:39:06 -08001515static inline int xfrm_alg_len(struct xfrm_algo *alg)
1516{
1517 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1518}
1519
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001520#ifdef CONFIG_XFRM_MIGRATE
1521static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1522{
Eric Dumazet0f99be02008-01-08 23:39:06 -08001523 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001524}
1525
1526static inline void xfrm_states_put(struct xfrm_state **states, int n)
1527{
1528 int i;
1529 for (i = 0; i < n; i++)
1530 xfrm_state_put(*(states + i));
1531}
1532
1533static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1534{
1535 int i;
1536 for (i = 0; i < n; i++)
1537 xfrm_state_delete(*(states + i));
1538}
1539#endif
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001540
Alexey Dobriyandef8b4f2008-10-28 13:24:06 -07001541#ifdef CONFIG_XFRM
Herbert Xu00501122007-12-11 01:53:43 -08001542static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1543{
1544 return skb->sp->xvec[skb->sp->len - 1];
1545}
Alexey Dobriyandef8b4f2008-10-28 13:24:06 -07001546#endif
Herbert Xu00501122007-12-11 01:53:43 -08001547
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548#endif /* _NET_XFRM_H */